/* roulang page: index */
:root {
            --bg-deep: #0e1a12;
            --bg-card: #142418;
            --bg-panel: #1a2d20;
            --bg-soft: #f4f6f2;
            --bg-white: #ffffff;
            --text-main: #e8ede5;
            --text-strong: #ffffff;
            --text-weak: #a8b3a0;
            --text-dark: #1c2218;
            --text-dark-weak: #55604d;
            --green-primary: #1f8a4c;
            --green-light: #36b06a;
            --green-deep: #146537;
            --orange-signal: #ff7a1a;
            --orange-hover: #e6680a;
            --yellow-glow: #f5c518;
            --border-light: #dde5d8;
            --border-dark: #2b3f30;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.08);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.12);
            --shadow-dark: 0 10px 32px rgba(0, 0, 0, 0.28);
            --space-xs: 8px;
            --space-sm: 16px;
            --space-md: 24px;
            --space-lg: 40px;
            --space-xl: 56px;
            --space-xxl: 72px;
            --max-width: 1200px;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
            --font-num: 'DIN', 'Roboto', 'SF Mono', 'PingFang SC', monospace;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--text-dark);
            background: var(--bg-soft);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        img {
            max-width: 100%;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding-left: var(--space-md);
            padding-right: var(--space-md);
        }

        /* Header */
        .header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--bg-deep);
            border-bottom: 1px solid var(--border-dark);
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.2);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: var(--space-sm);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--text-strong);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--green-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 800;
            flex-shrink: 0;
        }

        .logo:hover {
            color: var(--green-light);
        }

        .logo:hover .logo-icon {
            background: var(--green-deep);
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            border-radius: var(--radius-sm);
            color: var(--text-weak);
            font-size: 0.95rem;
            font-weight: 500;
            transition: color 0.2s, background 0.2s;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--text-strong);
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-link.active {
            color: var(--orange-signal);
            background: rgba(255, 122, 26, 0.12);
        }

        .lang-switch {
            display: flex;
            align-items: center;
            gap: 4px;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid var(--border-dark);
            border-radius: 20px;
            padding: 4px;
            flex-shrink: 0;
        }

        .lang-btn {
            padding: 4px 10px;
            border-radius: 16px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--text-weak);
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
        }

        .lang-btn.active {
            background: var(--green-primary);
            color: #fff;
        }

        .lang-btn:hover:not(.active) {
            color: var(--text-strong);
            background: rgba(255, 255, 255, 0.12);
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 32px;
            height: 32px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            transition: background 0.2s;
        }

        .hamburger:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        .hamburger span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-strong);
            border-radius: 2px;
            transition: transform 0.3s, opacity 0.3s;
        }

        .hamburger.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            background: var(--bg-deep);
            border-top: 1px solid var(--border-dark);
            padding: var(--space-sm) var(--space-md);
            flex-direction: column;
            gap: 6px;
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu .nav-link {
            padding: 10px 12px;
            font-size: 1rem;
            border-radius: var(--radius-sm);
        }

        .mobile-menu .lang-switch {
            margin-top: 8px;
            align-self: flex-start;
        }

        /* Hero */
        .hero {
            background:
                linear-gradient(180deg, rgba(10, 18, 12, 0.88) 0%, rgba(14, 26, 18, 0.95) 100%),
                url('/assets/images/754f5860f9c967c5.webp') center/cover no-repeat;
            color: var(--text-main);
            padding: var(--space-xl) 0 var(--space-lg);
            position: relative;
            overflow: hidden;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--green-primary), var(--orange-signal), var(--green-light));
        }

        .hero-inner {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-xl);
            align-items: center;
        }

        .hero-content {
            display: flex;
            flex-direction: column;
            gap: var(--space-md);
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 122, 26, 0.15);
            border: 1px solid rgba(255, 122, 26, 0.35);
            color: var(--orange-signal);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 600;
            width: fit-content;
        }

        .hero-badge::before {
            content: '';
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--orange-signal);
            animation: pulse-dot 1.8s infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.5;
                transform: scale(1.5);
            }
        }

        .hero h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.25;
            color: var(--text-strong);
            letter-spacing: 0.01em;
            margin: 0;
        }

        .hero h1 .highlight {
            color: var(--orange-signal);
        }

        .hero-desc {
            font-size: 1.05rem;
            color: var(--text-weak);
            line-height: 1.8;
            max-width: 520px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-sm);
            margin-top: 4px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            transition: background 0.25s, color 0.25s, box-shadow 0.25s, transform 0.15s;
            white-space: nowrap;
        }

        .btn:focus-visible,
        .nav-link:focus-visible,
        .hamburger:focus-visible,
        .lang-btn:focus-visible {
            outline: 2px solid var(--orange-signal);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--orange-signal);
            color: #1a1005;
        }

        .btn-primary:hover {
            background: var(--orange-hover);
            box-shadow: 0 6px 20px rgba(255, 122, 26, 0.4);
            transform: translateY(-1px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(255, 122, 26, 0.3);
        }

        .btn-secondary {
            background: transparent;
            color: var(--text-main);
            border: 1px solid var(--border-dark);
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: var(--text-weak);
            color: var(--text-strong);
        }

        .btn-ghost {
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-main);
            border: 1px solid var(--border-dark);
        }

        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.12);
            color: var(--text-strong);
        }

        .hero-trust {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: 0.82rem;
            color: var(--text-weak);
            flex-wrap: wrap;
        }

        .trust-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.04);
            padding: 4px 12px;
            border-radius: 12px;
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        .trust-badge::before {
            content: '✓';
            color: var(--green-light);
            font-weight: 700;
        }

        /* Indicators board */
        .indicators-board {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-sm);
            background: rgba(20, 36, 24, 0.9);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-lg);
            padding: var(--space-md);
            box-shadow: var(--shadow-dark);
        }

        .indicator-item {
            display: flex;
            flex-direction: column;
            gap: 4px;
            padding: 14px 16px;
            border-radius: var(--radius-md);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.06);
            transition: background 0.25s, border-color 0.25s;
        }

        .indicator-item:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.14);
        }

        .indicator-label {
            font-size: 0.78rem;
            color: var(--text-weak);
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .indicator-value {
            font-family: var(--font-num);
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text-strong);
            line-height: 1.2;
        }

        .indicator-value .unit {
            font-size: 0.85rem;
            font-weight: 500;
            color: var(--text-weak);
            margin-left: 2px;
        }

        .indicator-change {
            font-size: 0.78rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .indicator-change.up {
            color: var(--green-light);
        }
        .indicator-change.down {
            color: #e05a5a;
        }

        /* Section common */
        .section {
            padding: var(--space-xl) 0;
        }

        .section-dark {
            background: var(--bg-deep);
            color: var(--text-main);
        }

        .section-light {
            background: var(--bg-soft);
            color: var(--text-dark);
        }

        .section-white {
            background: var(--bg-white);
            color: var(--text-dark);
        }

        .section-panel {
            background: var(--bg-panel);
            color: var(--text-main);
            border-radius: var(--radius-md);
            padding: var(--space-md);
        }

        .section-header {
            margin-bottom: var(--space-lg);
        }

        .section-header h2 {
            font-size: 1.8rem;
            font-weight: 800;
            color: inherit;
            line-height: 1.3;
            letter-spacing: 0.01em;
        }

        .section-header .subtitle {
            font-size: 1rem;
            color: var(--text-weak);
            margin-top: 8px;
            max-width: 640px;
            line-height: 1.75;
        }

        .section-header .subtitle-dark {
            color: var(--text-dark-weak);
        }

        .section-header.center {
            text-align: center;
        }
        .section-header.center .subtitle {
            margin-left: auto;
            margin-right: auto;
        }

        /* Service matrix */
        .service-matrix {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-sm);
        }

        .service-card {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            box-shadow: var(--shadow-sm);
            transition: box-shadow 0.25s, transform 0.2s, border-color 0.25s;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .service-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--green-light);
        }

        .service-card .card-icon {
            width: 44px;
            height: 44px;
            border-radius: 10px;
            background: rgba(31, 138, 76, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: var(--green-primary);
            flex-shrink: 0;
        }

        .service-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-dark);
        }

        .service-card p {
            font-size: 0.88rem;
            color: var(--text-dark-weak);
            line-height: 1.65;
            flex: 1;
        }

        .service-card .card-tag {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--orange-signal);
        }

        /* Comparison */
        .comparison-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-md);
            align-items: stretch;
        }

        .comparison-panel {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            box-shadow: var(--shadow-sm);
        }

        .comparison-panel.before {
            border-left: 4px solid #c0c8bb;
        }
        .comparison-panel.after {
            border-left: 4px solid var(--green-primary);
            background: #f6fbf7;
        }

        .comparison-panel .panel-title {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-dark-weak);
            text-transform: uppercase;
            letter-spacing: 0.04em;
            margin-bottom: 12px;
        }
        .comparison-panel.after .panel-title {
            color: var(--green-deep);
        }

        .comparison-panel ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .comparison-panel li {
            font-size: 0.9rem;
            color: var(--text-dark);
            line-height: 1.65;
            display: flex;
            gap: 8px;
            align-items: flex-start;
        }
        .comparison-panel li::before {
            content: '·';
            font-weight: 700;
            color: var(--text-dark-weak);
        }
        .comparison-panel.after li::before {
            color: var(--green-primary);
        }

        /* Milestones */
        .milestones {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-sm);
            position: relative;
        }

        .milestone-item {
            background: var(--bg-panel);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            position: relative;
            display: flex;
            flex-direction: column;
            gap: 6px;
            transition: border-color 0.25s, box-shadow 0.25s;
        }

        .milestone-item:hover {
            border-color: var(--orange-signal);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
        }

        .milestone-date {
            font-family: var(--font-num);
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--yellow-glow);
            letter-spacing: 0.04em;
        }

        .milestone-item h3 {
            font-size: 0.98rem;
            font-weight: 700;
            color: var(--text-strong);
        }

        .milestone-item p {
            font-size: 0.85rem;
            color: var(--text-weak);
            line-height: 1.6;
        }

        /* News list */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }

        .news-item {
            display: grid;
            grid-template-columns: 160px 1fr auto;
            gap: var(--space-md);
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            padding: var(--space-sm);
            box-shadow: var(--shadow-sm);
            align-items: center;
            transition: box-shadow 0.25s, border-color 0.25s;
        }

        .news-item:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--green-light);
        }

        .news-cover {
            width: 160px;
            height: 100px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            background: #e0e6db;
        }

        .news-info {
            display: flex;
            flex-direction: column;
            gap: 6px;
            min-width: 0;
        }

        .news-title {
            font-size: 0.98rem;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.4;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }

        .news-summary {
            font-size: 0.85rem;
            color: var(--text-dark-weak);
            line-height: 1.6;
            overflow: hidden;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
        }

        .news-date {
            font-size: 0.78rem;
            color: var(--text-weak);
            white-space: nowrap;
            flex-shrink: 0;
        }

        /* Guarantee strip */
        .guarantee-strip {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-sm);
        }

        .guarantee-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: var(--space-sm);
            border-radius: var(--radius-md);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.08);
            transition: background 0.25s;
        }

        .guarantee-item:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        .guarantee-icon {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: rgba(31, 138, 76, 0.25);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: var(--green-light);
            flex-shrink: 0;
        }

        .guarantee-item h3 {
            font-size: 0.92rem;
            font-weight: 700;
            color: var(--text-strong);
            margin-bottom: 4px;
        }

        .guarantee-item p {
            font-size: 0.82rem;
            color: var(--text-weak);
            line-height: 1.6;
        }

        /* Hot matches */
        .hot-matches {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-sm);
        }

        .match-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: box-shadow 0.25s, transform 0.2s;
            display: flex;
            flex-direction: column;
        }

        .match-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .match-cover {
            width: 100%;
            height: 150px;
            object-fit: cover;
            background: #e0e6db;
        }

        .match-body {
            padding: var(--space-sm);
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex: 1;
        }

        .match-tag {
            font-size: 0.72rem;
            font-weight: 700;
            color: var(--orange-signal);
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }

        .match-teams {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.4;
        }

        .match-score {
            font-family: var(--font-num);
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--green-deep);
        }

        .match-note {
            font-size: 0.8rem;
            color: var(--text-dark-weak);
        }

        /* Brand intro */
        .brand-intro {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            box-shadow: var(--shadow-sm);
            line-height: 1.85;
        }

        .brand-intro h2 {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--text-dark);
            margin-bottom: var(--space-sm);
        }

        .brand-intro p {
            font-size: 0.95rem;
            color: var(--text-dark-weak);
            margin-bottom: 12px;
        }

        /* Quick answers */
        .quick-answers {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-sm);
        }

        .qa-item {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .qa-item h3 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-dark);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .qa-item h3::before {
            content: '?';
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--green-primary);
            color: #fff;
            font-size: 0.8rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            flex-shrink: 0;
        }

        .qa-item p {
            font-size: 0.88rem;
            color: var(--text-dark-weak);
            line-height: 1.65;
        }

        /* FAQ */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: border-color 0.25s;
        }

        .faq-item:hover {
            border-color: var(--green-light);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-sm);
            width: 100%;
            padding: var(--space-md);
            text-align: left;
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-dark);
            cursor: pointer;
            transition: background 0.2s;
        }

        .faq-question:hover {
            background: #f6fbf7;
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(31, 138, 76, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--green-primary);
            flex-shrink: 0;
            transition: transform 0.3s;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.3s ease;
            padding: 0 var(--space-md);
            font-size: 0.88rem;
            color: var(--text-dark-weak);
            line-height: 1.7;
        }

        .faq-item.open .faq-answer {
            max-height: 200px;
            padding-bottom: var(--space-md);
        }

        /* Form */
        .form-section {
            background: var(--bg-deep);
            color: var(--text-main);
        }

        .form-card {
            background: var(--bg-panel);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            max-width: 560px;
            margin: 0 auto;
            box-shadow: var(--shadow-dark);
        }

        .form-card h2 {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-strong);
            margin-bottom: 8px;
        }

        .form-card .form-subtitle {
            font-size: 0.92rem;
            color: var(--text-weak);
            margin-bottom: var(--space-md);
        }

        .form-group {
            margin-bottom: var(--space-sm);
        }

        .form-group label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-weak);
            margin-bottom: 6px;
        }

        .form-group input,
        .form-group select {
            width: 100%;
            padding: 12px 14px;
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-strong);
            font-size: 0.9rem;
            transition: border-color 0.25s, box-shadow 0.25s;
            outline: none;
        }

        .form-group input::placeholder {
            color: rgba(168, 179, 160, 0.6);
        }

        .form-group input:focus,
        .form-group select:focus {
            border-color: var(--orange-signal);
            box-shadow: 0 0 0 3px rgba(255, 122, 26, 0.15);
        }

        .form-group input.error {
            border-color: #e05a5a;
            box-shadow: 0 0 0 3px rgba(224, 90, 90, 0.15);
        }

        .form-group input.success {
            border-color: var(--green-light);
            box-shadow: 0 0 0 3px rgba(54, 176, 106, 0.15);
        }

        .form-submit {
            width: 100%;
            margin-top: 8px;
        }

        .form-note {
            font-size: 0.78rem;
            color: var(--text-weak);
            text-align: center;
            margin-top: 12px;
        }

        /* Knowledge library */
        .knowledge-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-sm);
        }

        .knowledge-card {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            box-shadow: var(--shadow-sm);
            transition: box-shadow 0.25s, transform 0.2s;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .knowledge-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .knowledge-card .card-label {
            font-size: 0.72rem;
            font-weight: 700;
            color: var(--green-primary);
            text-transform: uppercase;
            letter-spacing: 0.04em;
        }

        .knowledge-card h3 {
            font-size: 0.98rem;
            font-weight: 700;
            color: var(--text-dark);
        }

        .knowledge-card p {
            font-size: 0.85rem;
            color: var(--text-dark-weak);
            line-height: 1.6;
        }

        /* Footer */
        .footer {
            background: var(--bg-deep);
            color: var(--text-weak);
            padding: var(--space-xl) 0 var(--space-md);
            border-top: 1px solid var(--border-dark);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--space-lg);
            margin-bottom: var(--space-lg);
        }

        .footer-brand .logo {
            font-size: 1.2rem;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 0.85rem;
            line-height: 1.7;
            max-width: 320px;
            color: var(--text-weak);
        }

        .footer-col h3 {
            font-size: 0.9rem;
            font-weight: 700;
            color: var(--text-strong);
            margin-bottom: 12px;
            letter-spacing: 0.03em;
        }

        .footer-col a {
            display: block;
            font-size: 0.85rem;
            color: var(--text-weak);
            padding: 4px 0;
            transition: color 0.2s;
        }

        .footer-col a:hover {
            color: var(--green-light);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-dark);
            padding-top: var(--space-md);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: var(--space-sm);
            font-size: 0.78rem;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hero-inner {
                grid-template-columns: 1fr;
                gap: var(--space-lg);
            }
            .indicators-board {
                grid-template-columns: repeat(4, 1fr);
            }
            .service-matrix {
                grid-template-columns: repeat(2, 1fr);
            }
            .milestones {
                grid-template-columns: repeat(2, 1fr);
            }
            .guarantee-strip {
                grid-template-columns: repeat(2, 1fr);
            }
            .hot-matches {
                grid-template-columns: repeat(2, 1fr);
            }
            .knowledge-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 2fr 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .header-inner {
                height: 60px;
            }
            .hero {
                padding: var(--space-lg) 0;
            }
            .hero h1 {
                font-size: 1.7rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            .indicators-board {
                grid-template-columns: repeat(2, 1fr);
                gap: 8px;
                padding: var(--space-sm);
            }
            .indicator-value {
                font-size: 1.3rem;
            }
            .section {
                padding: var(--space-lg) 0;
            }
            .section-header h2 {
                font-size: 1.4rem;
            }
            .service-matrix,
            .milestones,
            .guarantee-strip,
            .hot-matches,
            .knowledge-grid,
            .quick-answers,
            .comparison-grid {
                grid-template-columns: 1fr;
            }
            .news-item {
                grid-template-columns: 100px 1fr;
                gap: var(--space-sm);
            }
            .news-cover {
                width: 100px;
                height: 70px;
            }
            .news-date {
                grid-column: 2;
                white-space: normal;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-md);
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .form-card {
                padding: var(--space-md);
            }
            .brand-intro {
                padding: var(--space-md);
            }
            .faq-question {
                font-size: 0.88rem;
                padding: var(--space-sm);
            }
            .faq-answer {
                font-size: 0.82rem;
                padding: 0 var(--space-sm);
            }
            .btn {
                padding: 10px 18px;
                font-size: 0.88rem;
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 1.4rem;
            }
            .hero-desc {
                font-size: 0.88rem;
            }
            .indicators-board {
                grid-template-columns: 1fr 1fr;
            }
            .indicator-item {
                padding: 10px 12px;
            }
            .indicator-value {
                font-size: 1.1rem;
            }
            .news-item {
                grid-template-columns: 1fr;
            }
            .news-cover {
                width: 100%;
                height: 160px;
            }
            .news-date {
                grid-column: auto;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .form-card {
                padding: var(--space-sm);
            }
            .section-header h2 {
                font-size: 1.2rem;
            }
            .btn {
                width: 100%;
            }
            .hero-actions {
                flex-direction: column;
            }
            .logo {
                font-size: 1.05rem;
            }
            .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 15px;
            }
        }

/* roulang page: category1 */
:root {
            --bg-deep: #0e1a12;
            --bg-card: #142418;
            --bg-panel: #1a2d20;
            --bg-soft: #f4f6f2;
            --bg-white: #ffffff;
            --text-main: #e8ede5;
            --text-strong: #ffffff;
            --text-weak: #a8b3a0;
            --text-dark: #1c2218;
            --text-dark-weak: #55604d;
            --green-primary: #1f8a4c;
            --green-light: #36b06a;
            --green-deep: #146537;
            --orange-signal: #ff7a1a;
            --orange-hover: #e6680a;
            --yellow-glow: #f5c518;
            --border-light: #dde5d8;
            --border-dark: #2b3f30;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.08);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.12);
            --shadow-dark: 0 10px 32px rgba(0, 0, 0, 0.28);
            --space-xs: 8px;
            --space-sm: 16px;
            --space-md: 24px;
            --space-lg: 40px;
            --space-xl: 56px;
            --space-xxl: 72px;
            --max-width: 1200px;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
            --font-num: 'DIN', 'Roboto', 'SF Mono', 'PingFang SC', monospace;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--text-dark);
            background: var(--bg-soft);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        img {
            max-width: 100%;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding-left: var(--space-md);
            padding-right: var(--space-md);
        }

        /* Header */
        .header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--bg-deep);
            border-bottom: 1px solid var(--border-dark);
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.2);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: var(--space-sm);
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--text-strong);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--green-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 800;
            flex-shrink: 0;
        }

        .logo:hover {
            color: var(--green-light);
        }

        .logo:hover .logo-icon {
            background: var(--green-deep);
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            border-radius: var(--radius-sm);
            color: var(--text-weak);
            font-size: 0.95rem;
            font-weight: 500;
            transition: color 0.2s, background 0.2s;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--text-strong);
            background: rgba(255, 255, 255, 0.06);
        }

        .nav-link.active {
            color: var(--orange-signal);
            background: rgba(255, 122, 26, 0.12);
        }

        .lang-switch {
            display: flex;
            align-items: center;
            gap: 4px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: 18px;
            padding: 2px 4px;
        }

        .lang-btn {
            padding: 4px 10px;
            border-radius: 14px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--text-weak);
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
        }

        .lang-btn.active {
            background: var(--green-primary);
            color: #fff;
        }

        .lang-btn:hover:not(.active) {
            color: var(--text-strong);
            background: rgba(255, 255, 255, 0.12);
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 32px;
            height: 32px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            transition: background 0.2s;
            flex-shrink: 0;
        }

        .hamburger:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        .hamburger span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-strong);
            border-radius: 2px;
            transition: transform 0.3s, opacity 0.3s;
        }

        .hamburger.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }

        .hamburger.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            flex-direction: column;
            gap: 4px;
            padding: var(--space-sm) var(--space-md);
            background: var(--bg-deep);
            border-top: 1px solid var(--border-dark);
        }

        .mobile-menu.open {
            display: flex;
        }

        .mobile-menu .lang-switch {
            margin-top: var(--space-xs);
            align-self: flex-start;
        }

        /* Breadcrumb */
        .breadcrumb-bar {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            padding: var(--space-xs) 0;
        }

        .breadcrumb-inner {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            color: var(--text-dark-weak);
            flex-wrap: wrap;
            min-height: 36px;
        }

        .breadcrumb-inner a {
            color: var(--green-deep);
            font-weight: 500;
            transition: color 0.2s;
        }

        .breadcrumb-inner a:hover {
            color: var(--orange-hover);
        }

        .breadcrumb-sep {
            color: #b7bfb2;
        }

        /* Category narrow bar */
        .category-narrow {
            background: var(--bg-deep);
            border-bottom: 1px solid var(--border-dark);
            padding: var(--space-md) 0 var(--space-lg);
        }

        .category-narrow .cat-tag {
            display: inline-flex;
            align-items: center;
            background: rgba(255, 122, 26, 0.18);
            color: var(--orange-signal);
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: var(--space-sm);
            text-transform: uppercase;
        }

        .category-narrow h1 {
            color: var(--text-strong);
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.25;
            margin-bottom: var(--space-sm);
            letter-spacing: 0.01em;
        }

        .category-narrow .cat-desc {
            color: var(--text-weak);
            font-size: 1rem;
            max-width: 720px;
            line-height: 1.8;
        }

        /* Section base */
        .section {
            padding: var(--space-xl) 0;
        }

        .section-alt {
            background: var(--bg-white);
        }

        .section-deep {
            background: var(--bg-deep);
        }

        .section-title {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.35;
            margin-bottom: var(--space-sm);
            letter-spacing: 0.01em;
        }

        .section-deep .section-title {
            color: var(--text-strong);
        }

        .section-sub {
            color: var(--text-dark-weak);
            font-size: 0.95rem;
            max-width: 680px;
            line-height: 1.8;
            margin-bottom: var(--space-lg);
        }

        .section-deep .section-sub {
            color: var(--text-weak);
        }

        /* Data overview */
        .meta-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-sm);
        }

        .meta-card {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            display: flex;
            flex-direction: column;
            gap: 8px;
            transition: box-shadow 0.25s, transform 0.25s, border-color 0.25s;
        }

        .meta-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: #c8d6c0;
        }

        .meta-card .meta-label {
            font-size: 0.8rem;
            color: var(--text-dark-weak);
            font-weight: 500;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }

        .meta-card .meta-value {
            font-family: var(--font-num);
            font-size: 2rem;
            font-weight: 700;
            color: var(--green-deep);
            line-height: 1.2;
        }

        .meta-card .meta-note {
            font-size: 0.82rem;
            color: var(--text-dark-weak);
        }

        /* Match list */
        .match-list-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-md);
        }

        .match-card {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: box-shadow 0.25s, transform 0.25s, border-color 0.25s;
            display: flex;
            flex-direction: column;
        }

        .match-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: #b9cbb2;
        }

        .match-card-img {
            position: relative;
            aspect-ratio: 16 / 9;
            background: #1a2d20;
            overflow: hidden;
        }

        .match-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.35s ease;
        }

        .match-card:hover .match-card-img img {
            transform: scale(1.03);
        }

        .match-card-body {
            padding: var(--space-md);
            display: flex;
            flex-direction: column;
            gap: 10px;
            flex: 1;
        }

        .match-card-tags {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }

        .badge {
            display: inline-flex;
            align-items: center;
            font-size: 0.72rem;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 16px;
            letter-spacing: 0.03em;
        }

        .badge-green {
            background: #e8f5ec;
            color: var(--green-deep);
        }

        .badge-orange {
            background: #fff1e6;
            color: var(--orange-hover);
        }

        .match-card-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.4;
            transition: color 0.2s;
        }

        .match-card:hover .match-card-title {
            color: var(--green-deep);
        }

        .match-card-summary {
            font-size: 0.88rem;
            color: var(--text-dark-weak);
            line-height: 1.7;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .match-card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 8px;
            font-size: 0.78rem;
            color: #8a9485;
            padding-top: 8px;
            border-top: 1px solid #eef1ec;
        }

        /* Update info */
        .update-panel {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-lg);
        }

        .update-block h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: var(--space-xs);
        }

        .update-block p {
            color: var(--text-dark-weak);
            font-size: 0.92rem;
            line-height: 1.75;
        }

        .update-block ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
            margin-top: var(--space-sm);
        }

        .update-block ul li {
            display: flex;
            align-items: flex-start;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-dark-weak);
            line-height: 1.6;
        }

        .update-block ul li::before {
            content: "";
            width: 6px;
            height: 6px;
            background: var(--green-primary);
            border-radius: 50%;
            flex-shrink: 0;
            margin-top: 10px;
        }

        /* Glossary */
        .glossary-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-md);
        }

        .glossary-card {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            transition: box-shadow 0.25s, transform 0.25s;
        }

        .glossary-card:hover {
            box-shadow: var(--shadow-sm);
            transform: translateY(-2px);
        }

        .glossary-card h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 6px;
        }

        .glossary-card p {
            font-size: 0.85rem;
            color: var(--text-dark-weak);
            line-height: 1.7;
        }

        /* Related */
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-md);
        }

        .related-card {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            display: flex;
            flex-direction: column;
            gap: 8px;
            transition: box-shadow 0.25s, transform 0.25s, border-color 0.25s;
        }

        .related-card:hover {
            box-shadow: var(--shadow-sm);
            transform: translateY(-2px);
            border-color: #c8d6c0;
        }

        .related-card .rel-date {
            font-size: 0.75rem;
            color: #8a9485;
        }

        .related-card h4 {
            font-size: 0.98rem;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.45;
            transition: color 0.2s;
        }

        .related-card:hover h4 {
            color: var(--green-deep);
        }

        .related-card p {
            font-size: 0.84rem;
            color: var(--text-dark-weak);
            line-height: 1.65;
            flex: 1;
        }

        .related-card a {
            font-size: 0.85rem;
            color: var(--orange-hover);
            font-weight: 600;
            transition: color 0.2s;
        }

        .related-card a:hover {
            color: var(--orange-signal);
        }

        /* Subscribe CTA */
        .cta-panel {
            background: var(--bg-deep);
            border-radius: var(--radius-lg);
            padding: var(--space-xl) var(--space-lg);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-lg);
            align-items: center;
            box-shadow: var(--shadow-dark);
        }

        .cta-panel h2 {
            color: var(--text-strong);
            font-size: 1.6rem;
            font-weight: 700;
            line-height: 1.35;
            margin-bottom: var(--space-xs);
        }

        .cta-panel p {
            color: var(--text-weak);
            font-size: 0.92rem;
            line-height: 1.75;
        }

        .cta-form {
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }

        .cta-form-row {
            display: flex;
            gap: var(--space-sm);
        }

        .cta-form input,
        .cta-form select {
            flex: 1;
            padding: 10px 14px;
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.06);
            color: var(--text-strong);
            font-size: 0.9rem;
            outline: none;
            transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
        }

        .cta-form input::placeholder {
            color: #6d786a;
        }

        .cta-form input:focus,
        .cta-form select:focus {
            border-color: var(--green-light);
            box-shadow: 0 0 0 3px rgba(54, 176, 106, 0.25);
            background: rgba(255, 255, 255, 0.09);
        }

        .cta-form select {
            appearance: none;
            -webkit-appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23a8b3a0' stroke-width='1.5'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 12px center;
            padding-right: 32px;
            color: var(--text-weak);
        }

        .cta-form select option {
            background: #142418;
            color: var(--text-main);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            background: var(--orange-signal);
            color: #fff;
            font-weight: 700;
            font-size: 0.95rem;
            border-radius: var(--radius-sm);
            transition: background 0.2s, box-shadow 0.2s, transform 0.15s;
            box-shadow: 0 3px 12px rgba(255, 122, 26, 0.3);
            white-space: nowrap;
        }

        .btn-primary:hover {
            background: var(--orange-hover);
            box-shadow: 0 5px 18px rgba(230, 104, 10, 0.4);
        }

        .btn-primary:active {
            transform: translateY(1px);
        }

        .btn-primary:focus-visible,
        .btn-primary:focus {
            outline: 3px solid rgba(255, 122, 26, 0.45);
            outline-offset: 2px;
        }

        /* Tips */
        .tips-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-sm);
        }

        .tip-item {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            padding: var(--space-sm) var(--space-md);
            display: flex;
            align-items: flex-start;
            gap: 10px;
            transition: box-shadow 0.2s, border-color 0.2s;
        }

        .tip-item:hover {
            box-shadow: var(--shadow-sm);
            border-color: #c8d6c0;
        }

        .tip-num {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: #e8f5ec;
            color: var(--green-deep);
            font-size: 0.78rem;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .tip-item p {
            font-size: 0.9rem;
            color: var(--text-dark-weak);
            line-height: 1.65;
        }

        /* Footer */
        .footer {
            background: var(--bg-deep);
            padding: var(--space-xl) 0 var(--space-md);
            margin-top: auto;
            border-top: 1px solid var(--border-dark);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--space-lg);
            margin-bottom: var(--space-lg);
        }

        .footer-brand .logo {
            margin-bottom: var(--space-sm);
        }

        .footer-brand p {
            color: var(--text-weak);
            font-size: 0.88rem;
            line-height: 1.75;
            max-width: 320px;
        }

        .footer-col h3 {
            color: var(--text-strong);
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: var(--space-sm);
            letter-spacing: 0.03em;
        }

        .footer-col a {
            display: block;
            color: var(--text-weak);
            font-size: 0.85rem;
            padding: 4px 0;
            transition: color 0.2s;
        }

        .footer-col a:hover {
            color: var(--orange-signal);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-dark);
            padding-top: var(--space-sm);
            display: flex;
            justify-content: space-between;
            gap: var(--space-sm);
            flex-wrap: wrap;
            font-size: 0.78rem;
            color: #6d786a;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .meta-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .match-list-grid,
            .glossary-grid,
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .update-panel {
                grid-template-columns: 1fr;
            }
            .cta-panel {
                grid-template-columns: 1fr;
                padding: var(--space-lg) var(--space-md);
            }
            .tips-list {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-md);
            }
        }

        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            .header .lang-switch {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .mobile-menu.open {
                display: flex;
            }
            .category-narrow h1 {
                font-size: 1.5rem;
            }
            .meta-grid {
                grid-template-columns: 1fr;
            }
            .match-list-grid,
            .glossary-grid,
            .related-grid {
                grid-template-columns: 1fr;
            }
            .section {
                padding: var(--space-lg) 0;
            }
            .section-title {
                font-size: 1.35rem;
            }
            .cta-form-row {
                flex-direction: column;
            }
            .cta-panel h2 {
                font-size: 1.3rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-sm);
            }
            .footer-bottom {
                flex-direction: column;
                justify-content: flex-start;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: var(--space-sm);
                padding-right: var(--space-sm);
            }
            .category-narrow h1 {
                font-size: 1.25rem;
            }
            .category-narrow {
                padding: var(--space-sm) 0 var(--space-md);
            }
            .match-card-body {
                padding: var(--space-sm);
            }
            .update-panel {
                padding: var(--space-sm);
            }
        }

/* roulang page: category2 */
:root {
            --bg-deep: #0e1a12;
            --bg-card: #142418;
            --bg-panel: #1a2d20;
            --bg-soft: #f4f6f2;
            --bg-white: #ffffff;
            --text-main: #e8ede5;
            --text-strong: #ffffff;
            --text-weak: #a8b3a0;
            --text-dark: #1c2218;
            --text-dark-weak: #55604d;
            --green-primary: #1f8a4c;
            --green-light: #36b06a;
            --green-deep: #146537;
            --orange-signal: #ff7a1a;
            --orange-hover: #e6680a;
            --yellow-glow: #f5c518;
            --border-light: #dde5d8;
            --border-dark: #2b3f30;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.08);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.12);
            --shadow-dark: 0 10px 32px rgba(0, 0, 0, 0.28);
            --space-xs: 8px;
            --space-sm: 16px;
            --space-md: 24px;
            --space-lg: 40px;
            --space-xl: 56px;
            --space-xxl: 72px;
            --max-width: 1200px;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
            --font-num: 'DIN', 'Roboto', 'SF Mono', 'PingFang SC', monospace;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--text-dark);
            background: var(--bg-soft);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding-left: var(--space-md);
            padding-right: var(--space-md);
        }
        /* Header */
        .header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--bg-deep);
            border-bottom: 1px solid var(--border-dark);
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: var(--space-sm);
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--text-strong);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--green-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 800;
            flex-shrink: 0;
        }
        .logo:hover {
            color: var(--green-light);
        }
        .logo:hover .logo-icon {
            background: var(--green-deep);
        }
        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            border-radius: var(--radius-sm);
            color: var(--text-weak);
            font-size: 0.95rem;
            font-weight: 500;
            transition: color 0.2s, background 0.2s;
            white-space: nowrap;
        }
        .nav-link:hover {
            color: var(--text-strong);
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-link.active {
            color: var(--orange-signal);
            background: rgba(255, 122, 26, 0.12);
        }
        .lang-switch {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-shrink: 0;
        }
        .lang-btn {
            padding: 4px 10px;
            border-radius: 16px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--text-weak);
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
        }
        .lang-btn.active {
            background: var(--green-primary);
            color: #fff;
        }
        .lang-btn:hover:not(.active) {
            color: var(--text-strong);
            background: rgba(255, 255, 255, 0.12);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 32px;
            height: 32px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .hamburger span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-strong);
            border-radius: 2px;
            transition: transform 0.3s, opacity 0.3s;
        }
        .hamburger.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }
        .mobile-menu {
            display: none;
            flex-direction: column;
            padding: var(--space-sm) var(--space-md) var(--space-md);
            background: var(--bg-deep);
            border-top: 1px solid var(--border-dark);
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu .nav-link {
            padding: 12px 4px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 0;
        }
        .mobile-menu .lang-switch {
            margin-top: var(--space-sm);
            justify-content: center;
        }
        /* Breadcrumb */
        .breadcrumb-bar {
            background: var(--bg-deep);
            border-bottom: 1px solid var(--border-dark);
            padding: 14px 0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-weak);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--green-light);
            transition: color 0.2s;
        }
        .breadcrumb a:hover {
            color: var(--orange-signal);
        }
        .breadcrumb .sep {
            color: var(--text-weak);
            opacity: 0.6;
        }
        .breadcrumb .current {
            color: var(--text-main);
            font-weight: 500;
        }
        /* Section base */
        .section {
            padding: var(--space-xl) 0;
        }
        .section-dark {
            background: var(--bg-deep);
            color: var(--text-main);
        }
        .section-white {
            background: var(--bg-white);
        }
        .section-soft {
            background: var(--bg-soft);
        }
        .section-title {
            font-size: 1.75rem;
            font-weight: 700;
            line-height: 1.35;
            color: var(--text-dark);
            margin-bottom: var(--space-sm);
            letter-spacing: 0.01em;
        }
        .section-dark .section-title {
            color: var(--text-strong);
        }
        .section-subtitle {
            font-size: 1rem;
            line-height: 1.7;
            color: var(--text-dark-weak);
            margin-bottom: var(--space-lg);
            max-width: 800px;
        }
        .section-dark .section-subtitle {
            color: var(--text-weak);
        }
        /* Category top */
        .category-top {
            background: linear-gradient(135deg, var(--bg-deep) 0%, #1b3324 55%, #0e1a12 100%);
            color: var(--text-main);
            padding: var(--space-lg) 0 var(--space-xl);
            border-bottom: 1px solid var(--border-dark);
            position: relative;
            overflow: hidden;
        }
        .category-top::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 420px;
            height: 420px;
            background: radial-gradient(circle, rgba(31, 138, 76, 0.28), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .category-top .container {
            position: relative;
            z-index: 1;
        }
        .category-title {
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.3;
            color: var(--text-strong);
            margin-bottom: var(--space-sm);
            letter-spacing: 0.01em;
        }
        .category-desc {
            font-size: 1.05rem;
            line-height: 1.8;
            color: var(--text-weak);
            max-width: 780px;
        }
        /* Stats strip */
        .stats-strip {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-md);
            margin-top: var(--space-lg);
        }
        .stat-card {
            background: rgba(20, 36, 24, 0.85);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            backdrop-filter: blur(8px);
            box-shadow: var(--shadow-sm);
        }
        .stat-card .stat-label {
            font-size: 0.85rem;
            color: var(--text-weak);
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .stat-card .stat-value {
            font-family: var(--font-num);
            font-size: 1.9rem;
            font-weight: 700;
            color: var(--orange-signal);
            line-height: 1.2;
        }
        .stat-card .stat-note {
            font-size: 0.8rem;
            color: var(--text-weak);
            margin-top: 6px;
        }
        /* Cards grid */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-md);
        }
        .card-grid.two-col {
            grid-template-columns: repeat(2, 1fr);
        }
        .card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--green-primary);
        }
        .card-cover {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: #dfe6db;
            position: relative;
        }
        .card-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .card:hover .card-cover img {
            transform: scale(1.04);
        }
        .card-body {
            padding: var(--space-md);
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.78rem;
            font-weight: 600;
            color: var(--green-deep);
            background: rgba(31, 138, 76, 0.1);
            padding: 4px 10px;
            border-radius: 20px;
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .card-title {
            font-size: 1.15rem;
            font-weight: 700;
            line-height: 1.45;
            color: var(--text-dark);
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .card-summary {
            font-size: 0.9rem;
            line-height: 1.7;
            color: var(--text-dark-weak);
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: var(--space-sm);
        }
        .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: auto;
            font-size: 0.8rem;
            color: var(--text-dark-weak);
            border-top: 1px solid var(--border-light);
            padding-top: 10px;
        }
        .card-meta .date {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .card-meta .read-more {
            color: var(--green-primary);
            font-weight: 600;
            transition: color 0.2s;
        }
        .card:hover .read-more {
            color: var(--orange-signal);
        }
        /* Dark cards */
        .card-dark {
            background: var(--bg-card);
            border-color: var(--border-dark);
            color: var(--text-main);
        }
        .card-dark .card-title {
            color: var(--text-strong);
        }
        .card-dark .card-summary {
            color: var(--text-weak);
        }
        .card-dark .card-meta {
            color: var(--text-weak);
            border-top-color: var(--border-dark);
        }
        .card-dark .card-tag {
            color: var(--green-light);
            background: rgba(54, 176, 106, 0.15);
        }
        .card-dark .read-more {
            color: var(--green-light);
        }
        /* Comparison table */
        .compare-table-wrap {
            overflow-x: auto;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            background: var(--bg-white);
            box-shadow: var(--shadow-sm);
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 680px;
            font-size: 0.92rem;
        }
        .compare-table th,
        .compare-table td {
            padding: 14px 16px;
            text-align: left;
            border-bottom: 1px solid var(--border-light);
        }
        .compare-table th {
            background: var(--bg-deep);
            color: var(--text-strong);
            font-weight: 600;
            font-size: 0.88rem;
            white-space: nowrap;
        }
        .compare-table tr:last-child td {
            border-bottom: none;
        }
        .compare-table tbody tr:hover {
            background: #f6f8f4;
        }
        .compare-table .trend-up {
            color: var(--green-deep);
            font-weight: 600;
            font-family: var(--font-num);
        }
        .compare-table .trend-down {
            color: #c0392b;
            font-weight: 600;
            font-family: var(--font-num);
        }
        .compare-table .trend-flat {
            color: var(--text-dark-weak);
            font-family: var(--font-num);
        }
        /* Term list */
        .term-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-md);
        }
        .term-card {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            box-shadow: var(--shadow-sm);
            transition: border-color 0.25s, box-shadow 0.25s;
        }
        .term-card:hover {
            border-color: var(--green-primary);
            box-shadow: var(--shadow-md);
        }
        .term-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .term-card h3 .term-icon {
            width: 28px;
            height: 28px;
            border-radius: 6px;
            background: var(--green-primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.85rem;
            flex-shrink: 0;
        }
        .term-card p {
            font-size: 0.88rem;
            line-height: 1.7;
            color: var(--text-dark-weak);
        }
        /* CTA box */
        .cta-box {
            background: linear-gradient(135deg, var(--bg-deep) 0%, var(--bg-panel) 60%, #0e1a12 100%);
            border-radius: var(--radius-lg);
            padding: var(--space-xl);
            color: var(--text-main);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-lg);
            border: 1px solid var(--border-dark);
            box-shadow: var(--shadow-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-box::after {
            content: '';
            position: absolute;
            bottom: -50px;
            right: -20px;
            width: 260px;
            height: 260px;
            background: radial-gradient(circle, rgba(255, 122, 26, 0.22), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-box .cta-text {
            flex: 1;
            position: relative;
            z-index: 1;
        }
        .cta-box h3 {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-strong);
            margin-bottom: 8px;
        }
        .cta-box p {
            color: var(--text-weak);
            font-size: 0.95rem;
            line-height: 1.7;
            max-width: 620px;
        }
        .cta-box .btn {
            position: relative;
            z-index: 1;
            flex-shrink: 0;
            white-space: nowrap;
        }
        /* Buttons */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: background 0.25s, color 0.25s, border-color 0.25s, transform 0.15s, box-shadow 0.25s;
            border: 2px solid transparent;
            cursor: pointer;
            outline: none;
        }
        .btn:focus-visible {
            outline: 3px solid rgba(255, 122, 26, 0.5);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--orange-signal);
            color: #fff;
            border-color: var(--orange-signal);
        }
        .btn-primary:hover {
            background: var(--orange-hover);
            border-color: var(--orange-hover);
            transform: translateY(-1px);
            box-shadow: 0 6px 18px rgba(255, 122, 26, 0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(255, 122, 26, 0.25);
        }
        .btn-outline {
            background: transparent;
            color: var(--green-light);
            border-color: var(--green-light);
        }
        .btn-outline:hover {
            background: rgba(54, 176, 106, 0.1);
            border-color: var(--green-light);
            color: var(--text-strong);
        }
        .btn-outline:active {
            background: rgba(54, 176, 106, 0.2);
        }
        .btn-sm {
            padding: 8px 16px;
            font-size: 0.85rem;
            border-radius: 6px;
        }
        /* FAQ */
        .faq-wrap {
            max-width: 840px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            margin-bottom: var(--space-sm);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: border-color 0.25s, box-shadow 0.25s;
        }
        .faq-item:hover {
            border-color: var(--green-primary);
            box-shadow: var(--shadow-md);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-sm);
            padding: 16px 20px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-dark);
            background: none;
            border: none;
            text-align: left;
            cursor: pointer;
            transition: color 0.2s;
        }
        .faq-question:hover {
            color: var(--green-deep);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: rgba(31, 138, 76, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--green-primary);
            transition: transform 0.3s, background 0.3s;
            font-size: 1.1rem;
            line-height: 1;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: var(--orange-signal);
            color: #fff;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 20px;
            color: var(--text-dark-weak);
            font-size: 0.92rem;
            line-height: 1.75;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px;
        }
        /* Footer */
        .footer {
            background: var(--bg-deep);
            color: var(--text-main);
            padding-top: var(--space-xl);
            margin-top: auto;
            border-top: 1px solid var(--border-dark);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--space-lg);
            padding-bottom: var(--space-lg);
        }
        .footer-brand p {
            font-size: 0.88rem;
            color: var(--text-weak);
            line-height: 1.7;
            margin-top: var(--space-sm);
            max-width: 340px;
        }
        .footer-col h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-strong);
            margin-bottom: var(--space-sm);
            letter-spacing: 0.02em;
        }
        .footer-col a {
            display: block;
            color: var(--text-weak);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: color 0.2s, padding-left 0.2s;
        }
        .footer-col a:hover {
            color: var(--green-light);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border-dark);
            padding: var(--space-md) 0;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.82rem;
            color: var(--text-weak);
        }
        /* Responsive */
        @media (max-width: 1024px) {
            .stats-strip {
                grid-template-columns: repeat(2, 1fr);
            }
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .term-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--space-md);
            }
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .lang-switch {
                display: none;
            }
            .mobile-menu .lang-switch {
                display: flex;
            }
            .category-title {
                font-size: 1.6rem;
            }
            .stats-strip {
                grid-template-columns: 1fr 1fr;
                gap: var(--space-sm);
            }
            .stat-card .stat-value {
                font-size: 1.5rem;
            }
            .card-grid,
            .card-grid.two-col,
            .term-grid {
                grid-template-columns: 1fr;
            }
            .cta-box {
                flex-direction: column;
                text-align: center;
                padding: var(--space-lg) var(--space-md);
            }
            .cta-box .btn {
                width: 100%;
            }
            .section {
                padding: var(--space-lg) 0;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-md);
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .stats-strip {
                grid-template-columns: 1fr;
            }
            .compare-table-wrap {
                border-radius: var(--radius-sm);
            }
            .compare-table {
                font-size: 0.82rem;
            }
            .compare-table th,
            .compare-table td {
                padding: 10px 12px;
            }
            .cta-box h3 {
                font-size: 1.2rem;
            }
            .faq-question {
                font-size: 0.92rem;
                padding: 14px 16px;
            }
            .faq-answer {
                font-size: 0.85rem;
            }
        }

/* roulang page: category3 */
:root {
            --bg-deep: #0e1a12;
            --bg-card: #142418;
            --bg-panel: #1a2d20;
            --bg-soft: #f4f6f2;
            --bg-white: #ffffff;
            --text-main: #e8ede5;
            --text-strong: #ffffff;
            --text-weak: #a8b3a0;
            --text-dark: #1c2218;
            --text-dark-weak: #55604d;
            --green-primary: #1f8a4c;
            --green-light: #36b06a;
            --green-deep: #146537;
            --orange-signal: #ff7a1a;
            --orange-hover: #e6680a;
            --yellow-glow: #f5c518;
            --border-light: #dde5d8;
            --border-dark: #2b3f30;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.08);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.12);
            --shadow-dark: 0 10px 32px rgba(0, 0, 0, 0.28);
            --space-xs: 8px;
            --space-sm: 16px;
            --space-md: 24px;
            --space-lg: 40px;
            --space-xl: 56px;
            --space-xxl: 72px;
            --max-width: 1200px;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
            --font-num: 'DIN', 'Roboto', 'SF Mono', 'PingFang SC', monospace;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: var(--font-sans);
            line-height: 1.7;
            color: var(--text-dark);
            background: var(--bg-soft);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        img {
            max-width: 100%;
            display: block;
        }

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
            color: inherit;
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding-left: var(--space-md);
            padding-right: var(--space-md);
        }

        /* Header */
        .header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--bg-deep);
            border-bottom: 1px solid var(--border-dark);
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
            gap: var(--space-sm);
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--text-strong);
            letter-spacing: 0.02em;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--green-primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            font-weight: 800;
            flex-shrink: 0;
        }
        .logo:hover {
            color: var(--green-light);
        }
        .logo:hover .logo-icon {
            background: var(--green-deep);
        }

        .nav-desktop {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 14px;
            border-radius: var(--radius-sm);
            color: var(--text-weak);
            font-size: 0.95rem;
            font-weight: 500;
            transition: color 0.2s, background 0.2s;
            white-space: nowrap;
        }
        .nav-link:hover {
            color: var(--text-strong);
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-link.active {
            color: var(--orange-signal);
            background: rgba(255, 122, 26, 0.12);
        }

        .lang-switch {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-shrink: 0;
        }
        .lang-btn {
            padding: 4px 10px;
            border-radius: 16px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--text-weak);
            transition: background 0.2s, color 0.2s;
            white-space: nowrap;
        }
        .lang-btn.active {
            background: var(--green-primary);
            color: #fff;
        }
        .lang-btn:hover:not(.active) {
            color: var(--text-strong);
            background: rgba(255, 255, 255, 0.12);
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            width: 32px;
            height: 32px;
            align-items: center;
            justify-content: center;
            border-radius: var(--radius-sm);
            transition: background 0.2s;
            flex-shrink: 0;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .hamburger span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--text-strong);
            border-radius: 2px;
            transition: transform 0.3s, opacity 0.3s;
        }
        .hamburger.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            flex-direction: column;
            padding: var(--space-sm) var(--space-md) var(--space-md);
            background: var(--bg-deep);
            border-top: 1px solid var(--border-dark);
            gap: 4px;
        }
        .mobile-menu.open {
            display: flex;
        }
        .mobile-menu .nav-link {
            padding: 12px 14px;
            font-size: 1rem;
            border-radius: var(--radius-sm);
        }
        .mobile-menu .lang-switch {
            margin-top: var(--space-xs);
            padding: 0 14px;
        }

        /* Breadcrumb */
        .breadcrumb-bar {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border-light);
            padding: var(--space-sm) 0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-dark-weak);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-dark-weak);
            transition: color 0.2s;
        }
        .breadcrumb a:hover {
            color: var(--green-primary);
        }
        .breadcrumb .sep {
            color: #b8c2b0;
            font-size: 0.75rem;
        }
        .breadcrumb .current {
            color: var(--green-primary);
            font-weight: 600;
        }

        /* Page header narrow */
        .page-head {
            background: var(--bg-white);
            padding: var(--space-lg) 0 var(--space-md);
            border-bottom: 1px solid var(--border-light);
        }
        .page-head-inner {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            gap: var(--space-md);
            flex-wrap: wrap;
        }
        .page-head-content {
            flex: 1;
            min-width: 280px;
        }
        .page-head h1 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.35;
            margin-bottom: var(--space-xs);
            letter-spacing: 0.01em;
        }
        .page-head .subtitle {
            font-size: 1.05rem;
            color: var(--text-dark-weak);
            line-height: 1.7;
            max-width: 650px;
        }
        .page-head-meta {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            flex-wrap: wrap;
            margin-top: var(--space-sm);
        }
        .meta-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 12px;
            border-radius: 20px;
            background: var(--bg-soft);
            border: 1px solid var(--border-light);
            font-size: 0.82rem;
            color: var(--text-dark-weak);
            font-weight: 500;
        }
        .meta-tag .dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--green-primary);
            display: inline-block;
        }

        /* Section base */
        .section {
            padding: var(--space-xl) 0;
        }
        .section.section-muted {
            background: var(--bg-white);
        }
        .section.section-dark {
            background: var(--bg-deep);
            color: var(--text-main);
        }
        .section-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            gap: var(--space-md);
            margin-bottom: var(--space-lg);
            flex-wrap: wrap;
        }
        .section-title {
            font-size: 1.65rem;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.4;
            letter-spacing: 0.01em;
        }
        .section-dark .section-title {
            color: var(--text-strong);
        }
        .section-sub {
            font-size: 0.98rem;
            color: var(--text-dark-weak);
            max-width: 600px;
            margin-top: var(--space-xs);
        }
        .section-dark .section-sub {
            color: var(--text-weak);
        }
        .section-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.92rem;
            font-weight: 600;
            color: var(--green-primary);
            white-space: nowrap;
            transition: color 0.2s, gap 0.2s;
        }
        .section-link:hover {
            color: var(--green-deep);
            gap: 10px;
        }
        .section-dark .section-link {
            color: var(--green-light);
        }
        .section-dark .section-link:hover {
            color: #5cc98a;
        }

        /* Rules grid */
        .rules-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-md);
        }
        .rule-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: var(--space-md);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
            position: relative;
            overflow: hidden;
        }
        .rule-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--green-primary);
            border-radius: var(--radius-md) var(--radius-md) 0 0;
        }
        .rule-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: #bcd0b8;
        }
        .rule-card .card-icon {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: rgba(31, 138, 76, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--green-primary);
            font-weight: 700;
            flex-shrink: 0;
        }
        .rule-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.4;
            margin: 0;
        }
        .rule-card p {
            font-size: 0.92rem;
            color: var(--text-dark-weak);
            line-height: 1.7;
            margin: 0;
            flex: 1;
        }
        .rule-card .card-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--green-primary);
            padding-top: var(--space-xs);
            border-top: 1px solid var(--border-light);
        }

        /* Calc example */
        .calc-example {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-lg);
            align-items: start;
        }
        .calc-panel {
            background: var(--bg-white);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
        }
        .calc-panel h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: var(--space-sm);
        }
        .calc-panel p {
            font-size: 0.95rem;
            color: var(--text-dark-weak);
            line-height: 1.7;
            margin-bottom: var(--space-md);
        }
        .calc-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.9rem;
            margin-top: var(--space-sm);
        }
        .calc-table th,
        .calc-table td {
            padding: 10px 14px;
            text-align: left;
            border-bottom: 1px solid var(--border-light);
            color: var(--text-dark);
        }
        .calc-table th {
            background: var(--bg-soft);
            font-weight: 600;
            color: var(--text-dark);
            font-size: 0.85rem;
            white-space: nowrap;
        }
        .calc-table td {
            font-family: var(--font-num);
            font-size: 0.88rem;
        }
        .calc-table .highlight {
            color: var(--orange-signal);
            font-weight: 700;
        }
        .calc-badge {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 16px;
            background: rgba(255, 122, 26, 0.12);
            color: var(--orange-signal);
            font-weight: 600;
            font-size: 0.8rem;
        }

        .calc-img-wrapper {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            position: relative;
            aspect-ratio: 4/3;
            background: var(--bg-panel);
        }
        .calc-img-wrapper img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }
        .calc-img-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: var(--space-md);
            background: linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.75));
            color: #fff;
            font-size: 0.88rem;
            font-weight: 500;
            line-height: 1.5;
        }

        /* Term chips */
        .terms-wrapper {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-sm);
        }
        .term-chip {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 18px;
            border-radius: 24px;
            background: var(--bg-white);
            border: 1px solid var(--border-light);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-dark);
            box-shadow: var(--shadow-sm);
            transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
        }
        .term-chip:hover {
            border-color: var(--green-primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }
        .term-chip .term-key {
            font-weight: 700;
            color: var(--green-primary);
        }
        .term-chip .term-val {
            color: var(--text-dark-weak);
        }

        /* FAQ */
        .faq-list {
            max-width: 850px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: border-color 0.25s, box-shadow 0.25s;
        }
        .faq-item:hover {
            border-color: #bcd0b8;
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-sm);
            padding: var(--space-md);
            text-align: left;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-dark);
            background: none;
            transition: color 0.2s;
        }
        .faq-question:hover {
            color: var(--green-primary);
        }
        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: var(--bg-soft);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--green-primary);
            transition: transform 0.3s, background 0.3s;
            flex-shrink: 0;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: var(--green-primary);
            color: #fff;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 var(--space-md);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 var(--space-md) var(--space-md);
        }
        .faq-answer p {
            font-size: 0.95rem;
            color: var(--text-dark-weak);
            line-height: 1.75;
        }

        /* Related posts */
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-md);
        }
        .related-card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: #bcd0b8;
        }
        .related-card img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            display: block;
        }
        .related-card-body {
            padding: var(--space-md);
            display: flex;
            flex-direction: column;
            gap: var(--space-xs);
            flex: 1;
        }
        .related-card h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-dark);
            line-height: 1.45;
            margin: 0;
        }
        .related-card p {
            font-size: 0.9rem;
            color: var(--text-dark-weak);
            line-height: 1.65;
            margin: 0;
            flex: 1;
        }
        .related-card .card-meta {
            display: flex;
            align-items: center;
            gap: var(--space-sm);
            font-size: 0.82rem;
            color: #8a9482;
            padding-top: var(--space-xs);
            border-top: 1px solid var(--border-light);
        }

        /* CTA */
        .cta-band {
            background: var(--bg-deep);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-lg);
            flex-wrap: wrap;
            box-shadow: var(--shadow-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-band::after {
            content: '';
            position: absolute;
            right: -40px;
            top: -40px;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: rgba(255, 122, 26, 0.1);
            pointer-events: none;
        }
        .cta-content {
            flex: 1;
            min-width: 260px;
        }
        .cta-content h3 {
            font-size: 1.45rem;
            font-weight: 700;
            color: var(--text-strong);
            margin-bottom: var(--space-xs);
        }
        .cta-content p {
            font-size: 0.98rem;
            color: var(--text-weak);
            line-height: 1.7;
            max-width: 500px;
        }
        .cta-actions {
            display: flex;
            gap: var(--space-sm);
            flex-wrap: wrap;
            position: relative;
            z-index: 1;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 600;
            transition: background 0.25s, color 0.25s, box-shadow 0.25s, transform 0.2s;
            white-space: nowrap;
        }
        .btn:focus-visible {
            outline: 3px solid rgba(255, 122, 26, 0.5);
            outline-offset: 2px;
        }
        .btn-primary {
            background: var(--orange-signal);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--orange-hover);
            box-shadow: 0 6px 18px rgba(255, 122, 26, 0.35);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            background: #cc5a08;
            transform: translateY(0);
            box-shadow: none;
        }
        .btn-outline {
            background: transparent;
            color: var(--text-strong);
            border: 1.5px solid rgba(255, 255, 255, 0.35);
        }
        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 255, 255, 0.6);
            color: #fff;
        }

        /* Info note */
        .info-note {
            background: var(--bg-white);
            border-left: 4px solid var(--orange-signal);
            border-radius: var(--radius-sm);
            padding: var(--space-md);
            box-shadow: var(--shadow-sm);
            font-size: 0.92rem;
            color: var(--text-dark-weak);
            line-height: 1.7;
        }
        .info-note strong {
            color: var(--text-dark);
            font-weight: 700;
        }

        /* Footer */
        .footer {
            background: var(--bg-deep);
            color: var(--text-weak);
            padding: var(--space-xl) 0 var(--space-md);
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--space-lg);
            margin-bottom: var(--space-lg);
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.75;
            margin-top: var(--space-sm);
            max-width: 340px;
            color: var(--text-weak);
        }
        .footer-col {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-strong);
            margin-bottom: var(--space-xs);
        }
        .footer-col a {
            font-size: 0.9rem;
            color: var(--text-weak);
            transition: color 0.2s;
        }
        .footer-col a:hover {
            color: var(--green-light);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-dark);
            padding-top: var(--space-md);
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: var(--space-sm);
            flex-wrap: wrap;
            font-size: 0.85rem;
            color: #7b8873;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .rules-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .calc-example {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
            .lang-switch {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .mobile-menu .lang-switch {
                display: flex;
            }
            .page-head h1 {
                font-size: 1.55rem;
            }
            .section-title {
                font-size: 1.4rem;
            }
            .rules-grid {
                grid-template-columns: 1fr;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--space-md);
            }
            .cta-band {
                flex-direction: column;
                align-items: flex-start;
                padding: var(--space-md);
            }
            .cta-actions {
                width: 100%;
                flex-direction: column;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .section {
                padding: var(--space-lg) 0;
            }
            .calc-panel {
                padding: var(--space-md);
            }
        }

        @media (max-width: 520px) {
            .page-head h1 {
                font-size: 1.35rem;
            }
            .section-title {
                font-size: 1.25rem;
            }
            .container {
                padding-left: var(--space-sm);
                padding-right: var(--space-sm);
            }
            .breadcrumb {
                font-size: 0.82rem;
            }
            .term-chip {
                font-size: 0.84rem;
                padding: 6px 14px;
            }
        }

/* roulang page: category4 */
:root {
    --bg-deep: #0e1a12;
    --bg-card: #142418;
    --bg-panel: #1a2d20;
    --bg-soft: #f4f6f2;
    --bg-white: #ffffff;
    --text-main: #e8ede5;
    --text-strong: #ffffff;
    --text-weak: #a8b3a0;
    --text-dark: #1c2218;
    --text-dark-weak: #55604d;
    --green-primary: #1f8a4c;
    --green-light: #36b06a;
    --green-deep: #146537;
    --orange-signal: #ff7a1a;
    --orange-hover: #e6680a;
    --yellow-glow: #f5c518;
    --border-light: #dde5d8;
    --border-dark: #2b3f30;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.12);
    --shadow-dark: 0 10px 32px rgba(0, 0, 0, 0.28);
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 40px;
    --space-xl: 56px;
    --space-xxl: 72px;
    --max-width: 1200px;
    --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
    --font-num: 'DIN', 'Roboto', 'SF Mono', 'PingFang SC', monospace;
  }

  html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
  }

  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  body {
    font-family: var(--font-sans);
    line-height: 1.7;
    color: var(--text-dark);
    background: var(--bg-soft);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
  }

  a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
  }

  img {
    max-width: 100%;
    display: block;
  }

  button,
  input,
  select,
  textarea {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
  }

  button {
    cursor: pointer;
    border: none;
    background: none;
  }

  .container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  /* Header */
  .header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-deep);
    border-bottom: 1px solid var(--border-dark);
    box-shadow: 0 2px 16px rgba(0, 0, 0, 0.2);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    gap: var(--space-sm);
  }

  .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-strong);
    letter-spacing: 0.02em;
    white-space: nowrap;
  }

  .logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--green-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: #fff;
    font-weight: 800;
    flex-shrink: 0;
  }

  .logo:hover {
    color: var(--green-light);
  }

  .logo:hover .logo-icon {
    background: var(--green-deep);
  }

  .nav-desktop {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-wrap: wrap;
  }

  .nav-link {
    display: inline-flex;
    align-items: center;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-weak);
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s, background 0.2s;
    white-space: nowrap;
  }

  .nav-link:hover {
    color: var(--text-strong);
    background: rgba(255, 255, 255, 0.06);
  }

  .nav-link.active {
    color: var(--orange-signal);
    background: rgba(255, 122, 26, 0.12);
  }

  .lang-switch {
    display: flex;
    align-items: center;
    gap: 4px;
  }

  .lang-btn {
    padding: 4px 10px;
    border-radius: 16px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-weak);
    transition: background 0.2s, color 0.2s;
    white-space: nowrap;
  }

  .lang-btn.active {
    background: var(--green-primary);
    color: #fff;
  }

  .lang-btn:hover:not(.active) {
    color: var(--text-strong);
    background: rgba(255, 255, 255, 0.12);
  }

  .hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 32px;
    height: 32px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: background 0.2s;
  }

  .hamburger:hover {
    background: rgba(255, 255, 255, 0.08);
  }

  .hamburger span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--text-strong);
    border-radius: 2px;
    transition: transform 0.3s, opacity 0.3s;
  }

  .hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .hamburger.open span:nth-child(2) {
    opacity: 0;
  }

  .hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .mobile-menu {
    display: none;
    flex-direction: column;
    gap: 8px;
    background: var(--bg-deep);
    border-top: 1px solid var(--border-dark);
    padding: var(--space-sm) var(--space-md) var(--space-md);
  }

  .mobile-menu.open {
    display: flex;
  }

  .mobile-menu .nav-link {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 0;
  }

  .mobile-menu .lang-switch {
    margin-top: 8px;
    justify-content: flex-start;
  }

  /* Footer */
  .footer {
    background: var(--bg-deep);
    color: var(--text-main);
    margin-top: auto;
    border-top: 1px solid var(--border-dark);
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1.8fr 1fr 1fr 1fr;
    gap: var(--space-lg);
    padding: var(--space-xl) 0 var(--space-lg);
  }

  .footer-brand .logo {
    color: var(--text-strong);
    margin-bottom: 14px;
  }

  .footer-brand p {
    color: var(--text-weak);
    font-size: 0.92rem;
    line-height: 1.8;
    max-width: 320px;
  }

  .footer-col h3 {
    color: var(--text-strong);
    font-size: 1rem;
    margin-bottom: 16px;
    font-weight: 600;
  }

  .footer-col a {
    display: block;
    color: var(--text-weak);
    font-size: 0.9rem;
    margin-bottom: 10px;
    transition: color 0.2s;
  }

  .footer-col a:hover {
    color: var(--orange-signal);
  }

  .footer-bottom {
    border-top: 1px solid var(--border-dark);
    padding: var(--space-sm) 0 var(--space-md);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 8px;
    color: var(--text-weak);
    font-size: 0.82rem;
  }

  /* Breadcrumb / Page Hero */
  .page-hero {
    background-color: var(--bg-soft);
    background-image: linear-gradient(rgba(14, 26, 18, 0.05), rgba(14, 26, 18, 0.05)), url('/assets/images/754f5860f9c967c5.webp');
    background-size: cover;
    background-position: center;
    padding: var(--space-lg) 0 var(--space-xl);
    border-bottom: 1px solid var(--border-light);
  }

  .breadcrumb {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 0.88rem;
    color: var(--text-dark-weak);
    margin-bottom: var(--space-sm);
  }

  .breadcrumb a {
    color: var(--green-deep);
    font-weight: 600;
  }

  .breadcrumb a:hover {
    color: var(--orange-hover);
  }

  .breadcrumb .sep {
    color: #a0aca0;
  }

  .page-hero h1 {
    font-size: 2rem;
    line-height: 1.3;
    color: var(--text-dark);
    font-weight: 800;
    letter-spacing: 0.01em;
    margin-bottom: var(--space-sm);
  }

  .page-hero .hero-summary {
    font-size: 1rem;
    color: var(--text-dark-weak);
    max-width: 720px;
    line-height: 1.9;
  }

  .hero-entry-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: var(--space-md);
    background: var(--orange-signal);
    color: #fff;
    font-weight: 700;
    padding: 12px 22px;
    border-radius: 999px;
    box-shadow: var(--shadow-sm);
    transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  }

  .hero-entry-btn:hover {
    background: var(--orange-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }

  .hero-entry-btn:focus-visible {
    outline: 3px solid var(--yellow-glow);
    outline-offset: 2px;
  }

  /* Section common */
  section {
    padding: var(--space-xl) 0;
  }

  .section-head {
    margin-bottom: var(--space-lg);
  }

  .section-head .eyebrow {
    display: inline-block;
    background: rgba(31, 138, 76, 0.1);
    color: var(--green-deep);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    padding: 4px 10px;
    border-radius: 999px;
    margin-bottom: 10px;
  }

  .section-head h2 {
    font-size: 1.65rem;
    line-height: 1.35;
    font-weight: 800;
    color: var(--text-dark);
  }

  .section-head p {
    color: var(--text-dark-weak);
    margin-top: 8px;
    max-width: 640px;
  }

  /* Knowledge list */
  .knowledge-list {
    background: var(--bg-white);
  }

  .knowledge-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
  }

  .knowledge-card {
    background: var(--bg-soft);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    display: flex;
    flex-direction: column;
  }

  .knowledge-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(31, 138, 76, 0.3);
  }

  .knowledge-card .card-cover {
    aspect-ratio: 16 / 9;
    background: #cfd8cd;
    position: relative;
    overflow: hidden;
  }

  .knowledge-card .card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
  }

  .knowledge-card:hover .card-cover img {
    transform: scale(1.04);
  }

  .knowledge-card .card-body {
    padding: 18px 18px 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
  }

  .knowledge-card h3 {
    font-size: 1.12rem;
    line-height: 1.5;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-dark);
  }

  .knowledge-card p {
    font-size: 0.9rem;
    color: var(--text-dark-weak);
    line-height: 1.8;
    flex: 1;
    margin-bottom: 14px;
  }

  .card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
  }

  .card-tag {
    background: rgba(31, 138, 76, 0.1);
    color: var(--green-deep);
    font-size: 0.76rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 999px;
    white-space: nowrap;
  }

  .card-date {
    font-size: 0.78rem;
    color: #8a9582;
    font-family: var(--font-num);
  }

  /* Term board */
  .term-board {
    background: var(--bg-soft);
  }

  .term-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
  }

  .term-item {
    background: var(--bg-white);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    transition: border-color 0.2s, box-shadow 0.2s;
  }

  .term-item:hover {
    border-color: rgba(31, 138, 76, 0.4);
    box-shadow: var(--shadow-md);
  }

  .term-item h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 6px;
  }

  .term-item p {
    font-size: 0.88rem;
    color: var(--text-dark-weak);
    line-height: 1.8;
  }

  /* Compare board */
  .compare-board {
    background: var(--bg-deep);
    color: var(--text-main);
  }

  .compare-board .section-head h2 {
    color: var(--text-strong);
  }

  .compare-board .section-head p {
    color: var(--text-weak);
  }

  .compare-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
  }

  .compare-card {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: 22px;
    border: 1px solid var(--border-dark);
    box-shadow: var(--shadow-dark);
    transition: border-color 0.2s, transform 0.2s;
  }

  .compare-card:hover {
    border-color: rgba(245, 197, 24, 0.5);
    transform: translateY(-3px);
  }

  .compare-card h3 {
    color: var(--yellow-glow);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
  }

  .compare-item {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.9rem;
  }

  .compare-item:last-child {
    border-bottom: none;
  }

  .compare-item span:first-child {
    color: var(--text-weak);
  }

  .compare-item span:last-child {
    color: var(--text-strong);
    font-weight: 600;
    text-align: right;
  }

  /* FAQ */
  .faq-section {
    background: var(--bg-white);
  }

  .faq-list {
    max-width: 820px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .faq-item {
    background: var(--bg-soft);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: border-color 0.2s, box-shadow 0.2s;
  }

  .faq-item.open {
    border-color: rgba(31, 138, 76, 0.4);
    box-shadow: var(--shadow-sm);
  }

  .faq-q {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 20px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-dark);
    background: transparent;
    text-align: left;
    transition: color 0.2s;
  }

  .faq-q:hover {
    color: var(--green-deep);
  }

  .faq-q .faq-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(31, 138, 76, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--green-deep);
    transition: transform 0.3s, background 0.2s;
  }

  .faq-item.open .faq-icon {
    transform: rotate(45deg);
    background: rgba(31, 138, 76, 0.2);
  }

  .faq-a {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease;
  }

  .faq-a-inner {
    padding: 0 20px 18px;
    color: var(--text-dark-weak);
    font-size: 0.92rem;
    line-height: 1.85;
  }

  /* CTA subscribe */
  .cta-subscribe {
    background: var(--bg-deep);
    color: var(--text-main);
    position: relative;
  }

  .cta-subscribe .section-head h2 {
    color: var(--text-strong);
  }

  .cta-subscribe .section-head p {
    color: var(--text-weak);
  }

  .subscribe-form {
    display: grid;
    grid-template-columns: 1fr 1fr auto;
    gap: 14px;
    max-width: 850px;
    margin-top: var(--space-md);
  }

  .subscribe-form input,
  .subscribe-form select {
    width: 100%;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-dark);
    background: var(--bg-panel);
    color: var(--text-strong);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
  }

  .subscribe-form input::placeholder {
    color: #82917c;
  }

  .subscribe-form input:focus,
  .subscribe-form select:focus {
    border-color: var(--green-light);
    box-shadow: 0 0 0 3px rgba(54, 176, 106, 0.18);
  }

  .subscribe-form .btn-primary {
    background: var(--orange-signal);
    color: #fff;
    font-weight: 700;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
    white-space: nowrap;
  }

  .subscribe-form .btn-primary:hover {
    background: var(--orange-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }

  .subscribe-form .btn-primary:focus-visible {
    outline: 3px solid var(--yellow-glow);
    outline-offset: 2px;
  }

  /* Important note */
  .important-note {
    background: var(--bg-soft);
  }

  .note-panel {
    background: var(--bg-white);
    border-left: 6px solid var(--orange-signal);
    border-radius: var(--radius-md);
    padding: 24px 26px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    border-left-width: 6px;
  }

  .note-panel h2 {
    font-size: 1.2rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 10px;
  }

  .note-panel p {
    color: var(--text-dark-weak);
    line-height: 1.9;
    font-size: 0.95rem;
  }

  /* Responsive */
  @media (min-width: 1024px) {
    .knowledge-grid {
      grid-template-columns: repeat(3, 1fr);
    }
    .term-list {
      grid-template-columns: repeat(3, 1fr);
    }
    .compare-grid {
      grid-template-columns: repeat(3, 1fr);
    }
  }

  @media (max-width: 1024px) and (min-width: 768px) {
    .knowledge-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .term-list {
      grid-template-columns: repeat(2, 1fr);
    }
    .compare-grid {
      grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
      grid-template-columns: 1fr 1fr;
      gap: var(--space-md);
    }
  }

  @media (max-width: 767px) {
    .nav-desktop {
      display: none;
    }
    .hamburger {
      display: flex;
    }
    .header-inner .lang-switch {
      display: none;
    }
    .mobile-menu .lang-switch {
      display: flex;
    }
    .page-hero h1 {
      font-size: 1.55rem;
    }
    .knowledge-grid,
    .term-list,
    .compare-grid {
      grid-template-columns: 1fr;
    }
    .subscribe-form {
      grid-template-columns: 1fr;
    }
    .subscribe-form .btn-primary {
      width: 100%;
      text-align: center;
    }
    .footer-grid {
      grid-template-columns: 1fr;
      gap: var(--space-md);
    }
    .footer-brand p {
      max-width: 100%;
    }
  }

  @media (max-width: 520px) {
    .header-inner {
      height: 60px;
    }
    .logo {
      font-size: 1.05rem;
    }
    .logo-icon {
      width: 30px;
      height: 30px;
      font-size: 15px;
    }
    section {
      padding: var(--space-lg) 0;
    }
    .page-hero {
      padding: var(--space-md) 0 var(--space-lg);
    }
    .page-hero h1 {
      font-size: 1.35rem;
    }
    .section-head h2 {
      font-size: 1.35rem;
    }
  }