/* roulang page: index */
:root {
            --color-primary: #2563EB;
            --color-primary-hover: #1D4ED8;
            --color-secondary: #0EA5E9;
            --color-accent: #14B8A6;
            --color-bg: #F8FAFC;
            --color-surface: #FFFFFF;
            --color-text: #0F172A;
            --color-text-secondary: #475569;
            --color-text-muted: #64748B;
            --color-border: #E2E8F0;
            --color-border-light: #EEF2F7;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 14px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
            --shadow-md: 0 6px 18px rgba(15, 23, 42, 0.06);
            --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.10);
            --shadow-xl: 0 20px 48px rgba(15, 23, 42, 0.14);
            --font-base: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --transition-fast: 0.18s ease;
            --transition-base: 0.28s ease;
            --container-max: 1200px;
            --section-padding: 80px 0;
            --section-padding-mobile: 48px 0;
            --focus-ring: 3px solid rgba(37, 99, 235, 0.25);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-base);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background-color: var(--color-bg);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color var(--transition-fast), opacity var(--transition-fast);
        }

        a:hover {
            color: var(--color-primary-hover);
        }

        a:focus-visible {
            outline: var(--focus-ring);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

        button:focus-visible,
        input:focus-visible,
        select:focus-visible,
        textarea:focus-visible {
            outline: var(--focus-ring);
            outline-offset: 2px;
        }

        .container {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ============ HEADER / NAV ============ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition-base);
        }

        .site-header.scrolled {
            box-shadow: var(--shadow-md);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            min-height: 68px;
            padding: 0 24px;
            max-width: var(--container-max);
            margin: 0 auto;
        }

        .nav-logo {
            flex-shrink: 0;
            font-size: 1.15rem;
            font-weight: 700;
            letter-spacing: 0.01em;
            color: var(--color-text);
            white-space: nowrap;
            transition: color var(--transition-fast);
            line-height: 1.3;
        }

        .nav-logo:hover {
            color: var(--color-primary);
        }

        .nav-logo .logo-accent {
            display: inline-block;
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav-segments {
            display: flex;
            align-items: center;
            gap: 6px;
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: 40px;
            padding: 4px;
            overflow-x: auto;
            -webkit-overflow-scrolling: touch;
            scrollbar-width: none;
        }

        .nav-segments::-webkit-scrollbar {
            display: none;
        }

        .nav-tab {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--color-text-secondary);
            border-radius: 32px;
            white-space: nowrap;
            transition: all var(--transition-fast);
            border: 1px solid transparent;
            cursor: pointer;
            background: transparent;
        }

        .nav-tab:hover {
            color: var(--color-primary);
            background: rgba(37, 99, 235, 0.06);
            border-color: rgba(37, 99, 235, 0.25);
        }

        .nav-tab.active {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
        }

        .nav-tab:focus-visible {
            outline: var(--focus-ring);
            outline-offset: 2px;
        }

        .nav-cta {
            flex-shrink: 0;
        }

        .nav-hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: transparent;
            border: none;
            cursor: pointer;
            padding: 10px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
            align-self: center;
        }

        .nav-hamburger:hover {
            background: var(--color-bg);
        }

        .nav-hamburger span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--color-text);
            border-radius: 2px;
            transition: all var(--transition-base);
            transform-origin: center;
        }

        .nav-hamburger[aria-expanded="true"] span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }

        .nav-hamburger[aria-expanded="true"] span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }

        .nav-hamburger[aria-expanded="true"] span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        .mobile-nav-panel {
            display: none;
            background: #fff;
            border-top: 1px solid var(--color-border);
            padding: 16px 24px 20px;
            box-shadow: var(--shadow-md);
        }

        .mobile-nav-panel.open {
            display: block;
            animation: slideDown 0.25s ease;
        }

        .mobile-nav-panel .nav-tab {
            display: flex;
            width: 100%;
            padding: 12px 16px;
            font-size: 1rem;
            border-radius: var(--radius-sm);
            margin-bottom: 6px;
        }

        .mobile-nav-panel .nav-tab.active {
            background: var(--color-primary);
            color: #fff;
        }

        .mobile-nav-panel .nav-cta {
            margin-top: 12px;
            width: 100%;
        }

        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-8px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        /* ============ BUTTONS ============ */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 11px 22px;
            font-size: 0.92rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            border: 1.5px solid transparent;
            cursor: pointer;
            transition: all var(--transition-fast);
            text-decoration: none;
            line-height: 1.4;
            white-space: nowrap;
            letter-spacing: 0.01em;
        }

        .btn:focus-visible {
            outline: var(--focus-ring);
            outline-offset: 3px;
        }

        .btn-primary {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
        }

        .btn-primary:hover {
            background: var(--color-primary-hover);
            border-color: var(--color-primary-hover);
            box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
            transform: translateY(-1px);
            color: #fff;
        }

        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: 0 1px 4px rgba(37, 99, 235, 0.2);
            background: #1E40AF;
        }

        .btn-secondary {
            background: var(--color-surface);
            color: var(--color-primary);
            border-color: var(--color-primary);
        }

        .btn-secondary:hover {
            background: rgba(37, 99, 235, 0.06);
            border-color: var(--color-primary-hover);
            color: var(--color-primary-hover);
            transform: translateY(-1px);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.12);
        }

        .btn-secondary:active {
            transform: translateY(1px);
            background: rgba(37, 99, 235, 0.1);
        }

        .btn-ghost {
            background: transparent;
            color: var(--color-text-secondary);
            border-color: var(--color-border);
        }

        .btn-ghost:hover {
            background: var(--color-bg);
            border-color: var(--color-text-muted);
            color: var(--color-text);
        }

        .btn-sm {
            padding: 8px 14px;
            font-size: 0.82rem;
            border-radius: 6px;
        }

        .btn-lg {
            padding: 14px 30px;
            font-size: 1rem;
            border-radius: var(--radius-md);
        }

        .btn-block {
            width: 100%;
            display: flex;
        }

        /* ============ BADGE / TAG / CHIP ============ */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 12px;
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: 20px;
            line-height: 1.4;
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .badge-primary {
            background: rgba(37, 99, 235, 0.1);
            color: var(--color-primary);
        }

        .badge-secondary {
            background: rgba(14, 165, 233, 0.1);
            color: #0284C7;
        }

        .badge-accent {
            background: rgba(20, 184, 166, 0.12);
            color: #0D9488;
        }

        .badge-warm {
            background: rgba(245, 158, 11, 0.12);
            color: #D97706;
        }

        .badge-outline {
            background: transparent;
            border: 1px solid var(--color-border);
            color: var(--color-text-secondary);
        }

        .badge-slash {
            position: relative;
            clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
        }

        .tag-chip {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 6px 14px;
            font-size: 0.82rem;
            font-weight: 500;
            color: var(--color-text-secondary);
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: 24px;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
            text-decoration: none;
            line-height: 1.4;
        }

        .tag-chip:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: rgba(37, 99, 235, 0.04);
        }

        .tag-chip:focus-visible {
            outline: var(--focus-ring);
            outline-offset: 2px;
        }

        .tag-chip.active {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.22);
        }

        /* ============ SECTIONS ============ */
        .section {
            padding: var(--section-padding);
            position: relative;
        }

        .section-alt {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border-light);
            border-bottom: 1px solid var(--color-border-light);
        }

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

        .section-accent {
            background: linear-gradient(180deg, #F0F7FF 0%, var(--color-bg) 100%);
            border-top: 1px solid var(--color-border-light);
        }

        .section-dark {
            background: var(--color-text);
            color: #E2E8F0;
        }

        .section-header {
            text-align: center;
            max-width: 720px;
            margin: 0 auto 48px;
        }

        .section-header h2 {
            font-size: 1.9rem;
            font-weight: 700;
            line-height: 1.35;
            color: var(--color-text);
            margin-bottom: 12px;
            letter-spacing: -0.01em;
        }

        .section-header p {
            font-size: 1.02rem;
            color: var(--color-text-secondary);
            line-height: 1.75;
            margin: 0;
        }

        .section-tag {
            display: inline-block;
            font-size: 0.78rem;
            font-weight: 700;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--color-primary);
            margin-bottom: 10px;
        }

        /* ============ HERO ============ */
        .hero-section {
            position: relative;
            padding: 96px 0 80px;
            background: var(--color-bg);
            overflow: hidden;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('/assets/images/3b6c12fb06200d8d.jpg') center/cover no-repeat;
            opacity: 0.05;
            z-index: 0;
            pointer-events: none;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            top: 0;
            right: -160px;
            width: 420px;
            height: 420px;
            background: radial-gradient(circle, rgba(37, 99, 235, 0.06) 0%, transparent 70%);
            z-index: 0;
            pointer-events: none;
            border-radius: 50%;
        }

        .hero-inner {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 860px;
            margin: 0 auto;
        }

        .hero-badge-row {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 8px;
            margin-bottom: 22px;
        }

        .hero-title {
            font-size: 2.6rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--color-text);
            letter-spacing: -0.02em;
            margin-bottom: 18px;
        }

        .hero-title .highlight {
            display: inline-block;
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-desc {
            font-size: 1.08rem;
            line-height: 1.85;
            color: var(--color-text-secondary);
            max-width: 680px;
            margin: 0 auto 30px;
        }

        .hero-search-wrap {
            max-width: 560px;
            margin: 0 auto 28px;
            position: relative;
        }

        .hero-search {
            display: flex;
            align-items: center;
            gap: 8px;
            background: var(--color-surface);
            border: 2px solid var(--color-border);
            border-radius: 48px;
            padding: 6px 6px 6px 20px;
            box-shadow: var(--shadow-md);
            transition: all var(--transition-base);
        }

        .hero-search:focus-within {
            border-color: var(--color-primary);
            box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1), var(--shadow-md);
        }

        .hero-search input {
            flex: 1;
            border: none;
            outline: none;
            background: transparent;
            font-size: 0.98rem;
            color: var(--color-text);
            min-width: 0;
            padding: 8px 0;
        }

        .hero-search input::placeholder {
            color: var(--color-text-muted);
        }

        .hero-search .btn {
            border-radius: 40px;
            padding: 10px 22px;
            flex-shrink: 0;
        }

        .hero-quick-chips {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 8px;
            margin-top: 16px;
        }

        .hero-quick-chips a {
            text-decoration: none;
        }

        .hero-cta-row {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin-top: 30px;
        }

        /* ============ STATS BAR ============ */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
            margin-top: 26px;
        }

        .stat-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 24px 16px;
            text-align: center;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
            position: relative;
            overflow: hidden;
        }

        .stat-item::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
            opacity: 0;
            transition: opacity var(--transition-base);
        }

        .stat-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.3);
        }

        .stat-item:hover::after {
            opacity: 1;
        }

        .stat-number {
            font-size: 2rem;
            font-weight: 700;
            color: var(--color-primary);
            line-height: 1.2;
            margin-bottom: 4px;
            letter-spacing: -0.02em;
        }

        .stat-label {
            font-size: 0.82rem;
            color: var(--color-text-secondary);
            font-weight: 500;
        }

        /* ============ CATEGORY CARDS ============ */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
        }

        .category-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 28px 22px;
            text-align: left;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
            cursor: pointer;
            position: relative;
            overflow: hidden;
            display: flex;
            flex-direction: column;
            gap: 10px;
            text-decoration: none;
            color: var(--color-text);
        }

        .category-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
            opacity: 0;
            transition: opacity var(--transition-base);
        }

        .category-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: rgba(37, 99, 235, 0.35);
            color: var(--color-text);
        }

        .category-card:hover::before {
            opacity: 1;
        }

        .category-card .card-icon {
            font-size: 1.8rem;
            line-height: 1;
            margin-bottom: 4px;
        }

        .category-card h3 {
            font-size: 1.12rem;
            font-weight: 700;
            color: var(--color-text);
            margin: 0;
        }

        .category-card p {
            font-size: 0.86rem;
            color: var(--color-text-secondary);
            line-height: 1.65;
            margin: 0;
            flex: 1;
        }

        .category-card .card-link {
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--color-primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--transition-fast);
        }

        .category-card:hover .card-link {
            gap: 8px;
        }

        /* ============ TOOL GRID ============ */
        .tool-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
        }

        .tool-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 24px 20px;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .tool-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.3);
        }

        .tool-card .tool-icon {
            font-size: 1.6rem;
            line-height: 1;
            margin-bottom: 4px;
        }

        .tool-card h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--color-text);
            margin: 0;
        }

        .tool-card p {
            font-size: 0.84rem;
            color: var(--color-text-secondary);
            line-height: 1.6;
            margin: 0;
        }

        /* ============ SCENE CARDS ============ */
        .scene-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 18px;
        }

        .scene-card {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 22px 18px;
            text-align: center;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }

        .scene-card:hover {
            background: var(--color-surface);
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.3);
        }

        .scene-card .scene-icon {
            font-size: 2rem;
            margin-bottom: 10px;
            line-height: 1;
        }

        .scene-card h4 {
            font-size: 0.98rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .scene-card p {
            font-size: 0.8rem;
            color: var(--color-text-secondary);
            line-height: 1.55;
            margin: 0;
        }

        /* ============ SCALE COVERAGE ============ */
        .coverage-strip {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
            margin-top: 20px;
        }

        .coverage-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 18px 26px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
            min-width: 120px;
            flex: 0 1 auto;
        }

        .coverage-item:hover {
            box-shadow: var(--shadow-md);
            border-color: rgba(37, 99, 235, 0.3);
            transform: translateY(-2px);
        }

        .coverage-item .cov-number {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--color-primary);
            line-height: 1.2;
        }

        .coverage-item .cov-label {
            font-size: 0.78rem;
            color: var(--color-text-secondary);
            font-weight: 500;
            margin-top: 2px;
        }

        /* ============ PREVIEW WALL ============ */
        .preview-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .preview-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
        }

        .preview-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: rgba(37, 99, 235, 0.3);
        }

        .preview-card .preview-thumb {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            border-radius: 0;
        }

        .preview-card .preview-body {
            padding: 18px 16px;
        }

        .preview-card .preview-body h4 {
            font-size: 0.98rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .preview-card .preview-body p {
            font-size: 0.8rem;
            color: var(--color-text-secondary);
            line-height: 1.55;
            margin: 0 0 8px;
        }

        .preview-card .preview-meta {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.74rem;
            color: var(--color-text-muted);
        }

        /* ============ DEMO SHOWCASE ============ */
        .demo-showcase {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .demo-showcase.reverse {
            direction: rtl;
        }

        .demo-showcase.reverse>* {
            direction: ltr;
        }

        .demo-text h3 {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .demo-text p {
            font-size: 0.94rem;
            color: var(--color-text-secondary);
            line-height: 1.75;
            margin-bottom: 16px;
        }

        .demo-text .demo-features {
            list-style: none;
            padding: 0;
            margin: 0 0 18px;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .demo-text .demo-features li {
            font-size: 0.88rem;
            color: var(--color-text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .demo-text .demo-features li::before {
            content: '✓';
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: rgba(20, 184, 166, 0.12);
            color: #0D9488;
            font-size: 0.7rem;
            font-weight: 700;
            flex-shrink: 0;
        }

        .demo-image-wrap {
            position: relative;
            overflow: hidden;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--color-border);
        }

        .demo-image-wrap img {
            width: 100%;
            aspect-ratio: 16/10;
            object-fit: cover;
            border-radius: var(--radius-lg);
            transition: transform var(--transition-base);
        }

        .demo-image-wrap:hover img {
            transform: scale(1.02);
        }

        .demo-image-wrap .demo-overlay {
            position: absolute;
            bottom: 16px;
            left: 16px;
            right: 16px;
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        /* ============ CASE CARDS ============ */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .case-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 26px 22px;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: 10px;
            position: relative;
        }

        .case-card::before {
            content: '"';
            position: absolute;
            top: 12px;
            right: 18px;
            font-size: 3rem;
            color: var(--color-border);
            font-family: serif;
            line-height: 1;
            pointer-events: none;
        }

        .case-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.3);
        }

        .case-card .case-title {
            font-size: 0.94rem;
            font-weight: 700;
            color: var(--color-text);
            margin: 0;
        }

        .case-card .case-desc {
            font-size: 0.84rem;
            color: var(--color-text-secondary);
            line-height: 1.65;
            margin: 0;
            flex: 1;
        }

        .case-card .case-meta {
            font-size: 0.76rem;
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        /* ============ MEMBER STATS ============ */
        .member-stats-row {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 20px;
            margin-top: 20px;
        }

        .member-stat-pill {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: 40px;
            padding: 14px 26px;
            display: flex;
            align-items: center;
            gap: 10px;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }

        .member-stat-pill:hover {
            box-shadow: var(--shadow-md);
            border-color: rgba(37, 99, 235, 0.3);
        }

        .member-stat-pill .pill-number {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--color-primary);
        }

        .member-stat-pill .pill-label {
            font-size: 0.8rem;
            color: var(--color-text-secondary);
            font-weight: 500;
        }

        /* ============ PRICING ============ */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 22px;
            align-items: stretch;
        }

        .pricing-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-lg);
            padding: 32px 26px;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: 14px;
            position: relative;
        }

        .pricing-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }

        .pricing-card.featured {
            border: 2px solid var(--color-primary);
            box-shadow: var(--shadow-lg);
            position: relative;
            transform: scale(1.03);
            z-index: 1;
        }

        .pricing-card.featured:hover {
            transform: scale(1.03) translateY(-3px);
        }

        .pricing-card .pricing-badge {
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--color-primary);
            color: #fff;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.72rem;
            font-weight: 700;
            letter-spacing: 0.03em;
            white-space: nowrap;
        }

        .pricing-card .price-name {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--color-text);
            margin: 0;
        }

        .pricing-card .price-amount {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--color-text);
            line-height: 1.1;
        }

        .pricing-card .price-amount .price-unit {
            font-size: 0.9rem;
            color: var(--color-text-secondary);
            font-weight: 500;
        }

        .pricing-card .price-features {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
            flex: 1;
        }

        .pricing-card .price-features li {
            font-size: 0.84rem;
            color: var(--color-text-secondary);
            display: flex;
            align-items: center;
            gap: 8px;
            line-height: 1.5;
        }

        .pricing-card .price-features li::before {
            content: '✓';
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: rgba(37, 99, 235, 0.12);
            color: var(--color-primary);
            font-size: 0.68rem;
            font-weight: 700;
            flex-shrink: 0;
        }

        /* ============ REVIEW WALL ============ */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }

        .review-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 22px 18px;
            transition: all var(--transition-base);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .review-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: rgba(37, 99, 235, 0.3);
        }

        .review-card .review-stars {
            display: flex;
            gap: 2px;
            font-size: 0.9rem;
            color: #F59E0B;
            margin-bottom: 2px;
        }

        .review-card .review-text {
            font-size: 0.86rem;
            color: var(--color-text-secondary);
            line-height: 1.65;
            margin: 0;
            flex: 1;
        }

        .review-card .review-author {
            font-size: 0.78rem;
            font-weight: 600;
            color: var(--color-text);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        /* ============ RANKING ============ */
        .ranking-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 720px;
            margin: 0 auto;
        }

        .ranking-item {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-md);
            padding: 16px 20px;
            display: flex;
            align-items: center;
            gap: 16px;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition-base);
        }

        .ranking-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: rgba(37, 99, 235, 0.3);
        }

        .ranking-pos {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--color-primary);
            width: 36px;
            text-align: center;
            flex-shrink: 0;
        }

        .ranking-info {
            flex: 1;
            min-width: 0;
        }

        .ranking-info .rank-name {
            font-size: 0.94rem;
            font-weight: 700;
            color: var(--color-text);
            margin: 0;
        }

        .ranking-info .rank-desc {
            font-size: 0.78rem;
            color: var(--color-text-secondary);
            margin: 2px 0 0;
        }

        .ranking-bar-wrap {
            width: 160px;
            flex-shrink: 0;
        }

        .ranking-bar-bg {
            width: 100%;
            height: 8px;
            background: var(--color-bg);
            border-radius: 4px;
            overflow: hidden;
            border: 1px solid var(--color-border-light);
        }

        .ranking-bar-fill {
            height: 100%;
            border-radius: 4px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
            transition: width var(--transition-base);
        }

        .ranking-score {
            font-size: 0.88rem;
            font-weight: 700;
            color: var(--color-text);
            width: 48px;
            text-align: right;
            flex-shrink: 0;
        }

        /* ============ NEWS LIST ============ */
        .news-list {
            display: flex;
            flex-direction: column;
            gap: 0;
            max-width: 820px;
            margin: 0 auto;
        }

        .news-item {
            display: flex;
            align-items: center;
            gap: 20px;
            padding: 18px 12px;
            border-bottom: 1px solid var(--color-border-light);
            transition: all var(--transition-fast);
            text-decoration: none;
            color: var(--color-text);
            border-radius: var(--radius-sm);
        }

        .news-item:hover {
            background: var(--color-bg);
            padding-left: 18px;
        }

        .news-item .news-date {
            font-size: 0.78rem;
            font-weight: 600;
            color: var(--color-text-muted);
            white-space: nowrap;
            flex-shrink: 0;
            width: 70px;
        }

        .news-item .news-title {
            font-size: 0.94rem;
            font-weight: 600;
            color: var(--color-text);
            flex: 1;
            min-width: 0;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            transition: color var(--transition-fast);
        }

        .news-item:hover .news-title {
            color: var(--color-primary);
        }

        .news-item .news-cat {
            flex-shrink: 0;
        }

        /* ============ CTA SECTION ============ */
        .cta-section {
            padding: 80px 0;
            position: relative;
            overflow: hidden;
            background: var(--color-text);
            color: #E2E8F0;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -20%;
            width: 70%;
            height: 200%;
            background: radial-gradient(ellipse, rgba(37, 99, 235, 0.22) 0%, transparent 65%);
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -40%;
            right: -10%;
            width: 60%;
            height: 180%;
            background: radial-gradient(ellipse, rgba(14, 165, 233, 0.16) 0%, transparent 65%);
            pointer-events: none;
        }

        .cta-inner {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 680px;
            margin: 0 auto;
        }

        .cta-inner h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
            line-height: 1.35;
        }

        .cta-inner p {
            font-size: 1rem;
            color: #CBD5E1;
            line-height: 1.75;
            margin-bottom: 28px;
        }

        .cta-inner .btn-primary {
            font-size: 1rem;
            padding: 14px 32px;
        }

        .cta-divider {
            width: 80px;
            height: 3px;
            background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
            margin: 0 auto 20px;
            border-radius: 2px;
        }

        /* ============ FOOTER ============ */
        .site-footer {
            background: #0B1220;
            color: #94A3B8;
            padding: 56px 0 28px;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 36px;
            margin-bottom: 40px;
        }

        .footer-brand h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: #F1F5F9;
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .footer-brand p {
            font-size: 0.84rem;
            line-height: 1.7;
            color: #94A3B8;
            margin: 0;
            max-width: 300px;
        }

        .footer-col h4 {
            font-size: 0.86rem;
            font-weight: 700;
            color: #E2E8F0;
            margin-bottom: 14px;
            letter-spacing: 0.03em;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .footer-col ul li a {
            font-size: 0.82rem;
            color: #94A3B8;
            text-decoration: none;
            transition: color var(--transition-fast);
            line-height: 1.5;
        }

        .footer-col ul li a:hover {
            color: #E2E8F0;
        }

        .footer-subscribe {
            display: flex;
            gap: 8px;
            margin-top: 6px;
        }

        .footer-subscribe input {
            flex: 1;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            border: 1px solid #334155;
            background: #1E293B;
            color: #E2E8F0;
            font-size: 0.84rem;
            outline: none;
            transition: border-color var(--transition-fast);
            min-width: 0;
        }

        .footer-subscribe input:focus {
            border-color: var(--color-primary);
        }

        .footer-subscribe input::placeholder {
            color: #64748B;
        }

        .footer-bottom {
            border-top: 1px solid #1E293B;
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 10px;
            font-size: 0.76rem;
            color: #64748B;
        }

        .footer-bottom .copyright {
            color: #64748B;
        }

        /* ============ RESPONSIVE ============ */
        @media (max-width: 1024px) {
            .category-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .tool-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .scene-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 14px;
            }
            .preview-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .case-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .review-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .pricing-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 18px;
            }
            .pricing-card.featured {
                transform: scale(1);
                grid-column: span 2;
            }
            .pricing-card.featured:hover {
                transform: translateY(-3px);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .hero-title {
                font-size: 2.1rem;
            }
            .demo-showcase {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .demo-showcase.reverse {
                direction: ltr;
            }
            .ranking-bar-wrap {
                width: 110px;
            }
        }

        @media (max-width: 768px) {
            .section {
                padding: var(--section-padding-mobile);
            }
            .section-header h2 {
                font-size: 1.5rem;
            }
            .hero-section {
                padding: 56px 0 48px;
            }
            .hero-title {
                font-size: 1.7rem;
                line-height: 1.4;
            }
            .hero-desc {
                font-size: 0.94rem;
                line-height: 1.7;
            }
            .nav-segments {
                display: none;
            }
            .nav-cta {
                display: none;
            }
            .nav-hamburger {
                display: flex;
            }
            .preview-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .case-grid {
                grid-template-columns: 1fr;
            }
            .review-grid {
                grid-template-columns: 1fr;
            }
            .pricing-grid {
                grid-template-columns: 1fr;
            }
            .pricing-card.featured {
                grid-column: span 1;
                transform: scale(1);
            }
            .pricing-card.featured:hover {
                transform: translateY(-3px);
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }
            .stat-number {
                font-size: 1.5rem;
            }
            .coverage-strip {
                gap: 10px;
            }
            .coverage-item {
                padding: 14px 18px;
                min-width: 90px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .news-item {
                flex-wrap: wrap;
                gap: 8px;
                padding: 14px 8px;
            }
            .news-item .news-date {
                width: auto;
            }
            .news-item .news-title {
                white-space: normal;
                width: 100%;
            }
            .ranking-item {
                flex-wrap: wrap;
                gap: 10px;
            }
            .ranking-bar-wrap {
                width: 100%;
                order: 3;
            }
            .ranking-score {
                order: 2;
                width: auto;
            }
            .cta-inner h2 {
                font-size: 1.5rem;
            }
            .hero-search {
                flex-direction: column;
                padding: 12px;
                border-radius: var(--radius-md);
            }
            .hero-search .btn {
                width: 100%;
                justify-content: center;
            }
            .hero-search input {
                width: 100%;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .nav-container {
                padding: 0 16px;
                gap: 12px;
                min-height: 58px;
            }
            .nav-logo {
                font-size: 0.95rem;
            }
            .hero-title {
                font-size: 1.4rem;
            }
            .hero-desc {
                font-size: 0.86rem;
            }
            .hero-badge-row {
                gap: 5px;
            }
            .badge {
                font-size: 0.7rem;
                padding: 3px 8px;
            }
            .category-grid,
            .tool-grid,
            .scene-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
            .stat-item {
                padding: 16px 12px;
            }
            .stat-number {
                font-size: 1.25rem;
            }
            .btn-lg {
                padding: 12px 20px;
                font-size: 0.9rem;
            }
            .btn {
                padding: 9px 16px;
                font-size: 0.84rem;
            }
            .hero-cta-row {
                flex-direction: column;
                gap: 8px;
            }
            .hero-cta-row .btn {
                width: 100%;
            }
            .section-tag {
                font-size: 0.7rem;
            }
            .section-header h2 {
                font-size: 1.3rem;
            }
            .coverage-item {
                min-width: 70px;
                padding: 10px 12px;
            }
            .coverage-item .cov-number {
                font-size: 1.2rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 6px;
            }
        }

/* roulang page: category1 */
:root {
  --color-primary: #2563EB;
  --color-primary-hover: #1D4ED8;
  --color-secondary: #0EA5E9;
  --color-accent: #14B8A6;
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #0F172A;
  --color-text-secondary: #475569;
  --color-text-muted: #64748B;
  --color-border: #E2E8F0;
  --color-border-light: #EEF2F7;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 6px 18px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.10);
  --shadow-xl: 0 20px 48px rgba(15, 23, 42, 0.14);
  --font-base: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition-fast: 0.18s ease;
  --transition-base: 0.28s ease;
  --container-max: 1200px;
  --section-padding: 80px 0;
  --section-padding-mobile: 48px 0;
  --focus-ring: 3px solid rgba(37, 99, 235, 0.25);
}
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body {
  font-family: var(--font-base);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  margin: 0;
  padding: 0;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
}
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast), opacity var(--transition-fast), border-color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}
a:hover {
  color: var(--color-primary-hover);
}
a:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
  border-radius: 4px;
}
button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
}
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
}
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}
main {
  flex: 1;
  width: 100%;
}
section {
  width: 100%;
}
/* ============ HEADER / NAV ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base);
}
.site-header.scrolled {
  box-shadow: var(--shadow-md);
}
.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 68px;
  padding: 0 24px;
  max-width: var(--container-max);
  margin: 0 auto;
}
.nav-logo {
  flex-shrink: 0;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--color-text);
  white-space: nowrap;
  transition: color var(--transition-fast);
  line-height: 1.3;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.nav-logo:hover {
  color: var(--color-primary);
}
.nav-logo .logo-accent {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav-segments {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 40px;
  padding: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.nav-segments::-webkit-scrollbar {
  display: none;
}
.nav-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: 32px;
  white-space: nowrap;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
  cursor: pointer;
  background: transparent;
}
.nav-tab:hover {
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.06);
  border-color: rgba(37, 99, 235, 0.25);
}
.nav-tab.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}
.nav-tab:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
}
.nav-cta {
  flex-shrink: 0;
}
.nav-cta .btn {
  padding: 10px 22px;
  font-size: 0.9rem;
  border-radius: 28px;
}
.nav-hamburger {
  display: none;
  flex-shrink: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  margin: 4px 0;
  border-radius: 2px;
  transition: all var(--transition-fast);
}
/* ============ BUTTONS ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 28px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-align: center;
  line-height: 1.5;
  text-decoration: none;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #fff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
  transform: translateY(-1px);
}
.btn-primary:active {
  transform: translateY(1px);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}
.btn-primary:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
}
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  background: rgba(37, 99, 235, 0.04);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn-secondary:active {
  transform: translateY(1px);
}
.btn-sm {
  padding: 8px 16px;
  font-size: 0.85rem;
}
/* ============ CLASSIFICATION PAGE HEADER ============ */
.classification-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 48px 0 40px;
}
.classification-header .container {
  max-width: var(--container-max);
}
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.breadcrumb a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}
.breadcrumb a:hover {
  color: var(--color-primary);
}
.breadcrumb .separator {
  color: var(--color-border);
  user-select: none;
}
.breadcrumb .current {
  color: var(--color-text-secondary);
  font-weight: 500;
}
.classification-header h1 {
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin: 0 0 16px 0;
  letter-spacing: -0.01em;
}
.classification-header .header-desc {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--color-text-secondary);
  max-width: 900px;
  margin: 0;
}
.classification-header .header-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}
.classification-header .header-meta .meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-bg);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--color-border);
}
/* ============ FILTER CHIP BAR ============ */
.filter-section {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 20px 0;
  position: sticky;
  top: 68px;
  z-index: 50;
}
.filter-section .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.filter-chips {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.filter-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 24px;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.filter-chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.04);
}
.filter-chip.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}
.filter-chip:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 2px;
}
.filter-sort {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}
.filter-sort select {
  padding: 8px 14px;
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: var(--color-bg);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: border-color var(--transition-fast);
}
.filter-sort select:hover {
  border-color: var(--color-primary);
}
/* ============ CARD GRID ============ */
.card-section {
  background: var(--color-bg);
  padding: var(--section-padding);
}
.card-section .section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.card-section .section-head h2 {
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
  letter-spacing: -0.01em;
}
.card-section .section-head .section-sub {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: 6px;
}
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.content-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}
.content-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
}
.content-card .card-image {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: 0;
}
.content-card .card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
  transition: transform var(--transition-base);
}
.content-card:hover .card-image img {
  transform: scale(1.04);
}
.content-card .card-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(6px);
  padding: 5px 12px;
  border-radius: 16px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-primary);
  border: 1px solid rgba(37, 99, 235, 0.2);
  z-index: 2;
}
.content-card .card-time {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(6px);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 500;
  color: #fff;
  z-index: 2;
}
.content-card .card-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.content-card .card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 8px 0;
  line-height: 1.5;
}
.content-card .card-title a {
  color: inherit;
  transition: color var(--transition-fast);
}
.content-card .card-title a:hover {
  color: var(--color-primary);
}
.content-card .card-desc {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin: 0 0 16px 0;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.content-card .card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border-light);
}
.content-card .card-tags {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.content-card .card-tags .tag {
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 14px;
  background: var(--color-bg);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  font-weight: 500;
}
.content-card .card-read {
  font-size: 0.8rem;
  color: var(--color-primary);
  font-weight: 500;
  white-space: nowrap;
}
/* ============ TAG WALL ============ */
.tag-wall-section {
  background: var(--color-surface);
  padding: var(--section-padding);
  border-top: 1px solid var(--color-border-light);
}
.tag-wall-section .section-head {
  margin-bottom: 28px;
}
.tag-wall-section .section-head h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}
.tag-wall {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.tag-wall .tag-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 18px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 22px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
  cursor: pointer;
}
.tag-wall .tag-link:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(37, 99, 235, 0.04);
  transform: translateY(-1px);
}
.tag-wall .tag-link.hot {
  border-color: rgba(37, 99, 235, 0.3);
  background: rgba(37, 99, 235, 0.05);
  color: var(--color-primary);
}
/* ============ EDITOR RECOMMENDATION ============ */
.editor-section {
  background: var(--color-bg);
  padding: var(--section-padding);
  border-top: 1px solid var(--color-border-light);
}
.editor-section .section-head {
  margin-bottom: 32px;
}
.editor-section .section-head h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}
.editor-section .section-head .section-sub {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}
.editor-recommendation {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.editor-row {
  display: grid;
  grid-template-columns: 420px 1fr;
  gap: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  align-items: center;
}
.editor-row:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}
.editor-row.reverse {
  grid-template-columns: 1fr 420px;
}
.editor-row .editor-image {
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: var(--radius-md);
}
.editor-row .editor-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
  transition: transform var(--transition-base);
}
.editor-row:hover .editor-image img {
  transform: scale(1.03);
}
.editor-row .editor-info h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 10px 0;
  line-height: 1.4;
}
.editor-row .editor-info .editor-desc {
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin: 0 0 14px 0;
}
.editor-row .editor-info .editor-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.editor-row .editor-info .editor-tags span {
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 16px;
  background: var(--color-bg);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  font-weight: 500;
}
.editor-row .editor-info .editor-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  transition: color var(--transition-fast);
}
.editor-row .editor-info .editor-link:hover {
  color: var(--color-primary-hover);
}
/* ============ UPDATE FEED ============ */
.update-feed-section {
  background: var(--color-surface);
  padding: var(--section-padding);
  border-top: 1px solid var(--color-border-light);
}
.update-feed-section .section-head {
  margin-bottom: 24px;
}
.update-feed-section .section-head h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}
.update-feed-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.update-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 18px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}
.update-item:hover {
  border-color: var(--color-primary);
  background: rgba(37, 99, 235, 0.03);
  transform: translateX(2px);
}
.update-item .update-date {
  flex-shrink: 0;
  min-width: 52px;
  padding: 4px 10px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  text-align: center;
  line-height: 1.4;
}
.update-item .update-content {
  flex: 1;
}
.update-item .update-content .update-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 4px 0;
  line-height: 1.5;
}
.update-item .update-content .update-title a {
  color: inherit;
  transition: color var(--transition-fast);
}
.update-item .update-content .update-title a:hover {
  color: var(--color-primary);
}
.update-item .update-content .update-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin: 0;
}
/* ============ CTA SECTION ============ */
.cta-section {
  background: var(--color-bg);
  padding: var(--section-padding);
  border-top: 1px solid var(--color-border-light);
}
.cta-section .cta-wrapper {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1E40AF 100%);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  position: relative;
  overflow: hidden;
}
.cta-section .cta-wrapper::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 50%;
  pointer-events: none;
}
.cta-section .cta-wrapper::after {
  content: '';
  position: absolute;
  bottom: -40px;
  left: 20%;
  width: 140px;
  height: 140px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
  pointer-events: none;
}
.cta-section .cta-content {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.cta-section .cta-content .cta-text h2 {
  font-size: 1.7rem;
  font-weight: 700;
  color: #fff;
  margin: 0 0 8px 0;
}
.cta-section .cta-content .cta-text p {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
}
.cta-section .cta-content .cta-form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  flex-shrink: 0;
}
.cta-section .cta-content .cta-form input {
  padding: 12px 20px;
  border-radius: 28px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.95);
  font-size: 0.9rem;
  color: var(--color-text);
  width: 280px;
  transition: all var(--transition-fast);
}
.cta-section .cta-content .cta-form input::placeholder {
  color: var(--color-text-muted);
}
.cta-section .cta-content .cta-form input:focus {
  outline: none;
  border-color: #fff;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.3);
}
.cta-section .cta-content .cta-form .btn-link {
  padding: 12px 26px;
  border-radius: 28px;
  background: #fff;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.9rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.cta-section .cta-content .cta-form .btn-link:hover {
  background: var(--color-bg);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}
.cta-section .cta-content .cta-form .btn-link:active {
  transform: translateY(1px);
}
/* ============ RELATED CATEGORY ENTRY ============ */
.related-section {
  background: var(--color-surface);
  padding: var(--section-padding);
  border-top: 1px solid var(--color-border-light);
}
.related-section .section-head {
  margin-bottom: 28px;
}
.related-section .section-head h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin: 0;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.related-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}
.related-card:hover {
  border-color: var(--color-primary);
  background: rgba(37, 99, 235, 0.03);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.related-card .related-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(14, 165, 233, 0.1));
  color: var(--color-primary);
}
.related-card .related-info h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
  margin: 0 0 4px 0;
}
.related-card .related-info p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin: 0;
}
/* ============ FOOTER ============ */
.site-footer {
  background: #0F172A;
  color: #CBD5E1;
  padding: 48px 0 24px;
  margin-top: auto;
}
.site-footer .container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}
.site-footer .footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 32px;
  margin-bottom: 32px;
}
.site-footer .footer-brand h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin: 0 0 12px 0;
}
.site-footer .footer-brand p {
  font-size: 0.85rem;
  line-height: 1.7;
  color: #94A3B8;
  margin: 0;
}
.site-footer .footer-col h4 {
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
  margin: 0 0 14px 0;
}
.site-footer .footer-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-footer .footer-col ul li {
  margin-bottom: 8px;
}
.site-footer .footer-col ul li a {
  font-size: 0.85rem;
  color: #94A3B8;
  transition: color var(--transition-fast);
}
.site-footer .footer-col ul li a:hover {
  color: #fff;
}
.site-footer .footer-subscribe {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.site-footer .footer-subscribe input {
  flex: 1;
  min-width: 160px;
  padding: 10px 16px;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  font-size: 0.85rem;
  transition: border-color var(--transition-fast);
}
.site-footer .footer-subscribe input::placeholder {
  color: #64748B;
}
.site-footer .footer-subscribe input:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.5);
}
.site-footer .footer-subscribe .btn {
  padding: 10px 18px;
  font-size: 0.85rem;
  border-radius: 20px;
}
.site-footer .footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.8rem;
  color: #64748B;
}
.site-footer .footer-bottom .copyright {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .related-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .editor-row,
  .editor-row.reverse {
    grid-template-columns: 1fr;
    padding: 20px;
  }
  .editor-row .editor-image {
    aspect-ratio: 16 / 8;
  }
  .site-footer .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .site-footer .footer-brand {
    grid-column: 1 / -1;
  }
}
@media (max-width: 768px) {
  :root {
    --section-padding: 48px 0;
    --section-padding-mobile: 40px 0;
  }
  .nav-container {
    padding: 0 16px;
    min-height: 60px;
    gap: 14px;
    flex-wrap: wrap;
  }
  .nav-logo {
    font-size: 1rem;
  }
  .nav-segments {
    order: 3;
    width: 100%;
    border-radius: 28px;
    padding: 3px;
  }
  .nav-tab {
    padding: 7px 14px;
    font-size: 0.8rem;
  }
  .nav-cta {
    margin-left: auto;
  }
  .nav-cta .btn {
    padding: 8px 16px;
    font-size: 0.8rem;
  }
  .nav-hamburger {
    display: none;
  }
  .card-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
  .related-grid {
    grid-template-columns: 1fr;
  }
  .classification-header h1 {
    font-size: 1.8rem;
  }
  .classification-header .header-desc {
    font-size: 0.88rem;
  }
  .filter-section {
    top: 112px;
    padding: 14px 0;
  }
  .filter-section .container {
    flex-direction: column;
    align-items: flex-start;
  }
  .filter-chips {
    width: 100%;
    overflow-x: auto;
    flex-wrap: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .filter-chips::-webkit-scrollbar {
    display: none;
  }
  .filter-chip {
    flex-shrink: 0;
  }
  .cta-section .cta-wrapper {
    padding: 32px 24px;
  }
  .cta-section .cta-content {
    flex-direction: column;
    align-items: flex-start;
  }
  .cta-section .cta-content .cta-form input {
    width: 100%;
  }
  .cta-section .cta-content .cta-form {
    width: 100%;
  }
  .editor-row {
    padding: 16px;
    gap: 18px;
  }
}
@media (max-width: 520px) {
  .container {
    padding: 0 16px;
  }
  .classification-header h1 {
    font-size: 1.5rem;
  }
  .classification-header .header-desc {
    font-size: 0.85rem;
  }
  .card-section .section-head h2,
  .tag-wall-section .section-head h2,
  .editor-section .section-head h2,
  .update-feed-section .section-head h2,
  .related-section .section-head h2 {
    font-size: 1.25rem;
  }
  .card-grid {
    gap: 14px;
  }
  .content-card .card-body {
    padding: 16px;
  }
  .content-card .card-title {
    font-size: 0.95rem;
  }
  .cta-section .cta-content .cta-text h2 {
    font-size: 1.4rem;
  }
  .site-footer .footer-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .site-footer .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}