/* roulang page: index */
:root {
            --primary: #059669;
            --primary-hover: #047857;
            --primary-light: #ecfdf5;
            --slate-900: #0f172a;
            --slate-800: #1e293b;
            --slate-700: #334155;
            --slate-600: #475569;
            --slate-500: #64748b;
            --slate-300: #cbd5e1;
            --slate-200: #e2e8f0;
            --slate-100: #f1f5f9;
            --slate-50: #f8fafc;
            --accent-cyan: #06b6d4;
            --accent-amber: #f59e0b;
            --dark-bg: #0b0f19;
            --white: #ffffff;
            --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 16px;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: var(--font-family);
            background-color: var(--slate-50);
            color: var(--slate-900);
            font-size: 16px;
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

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

        .tabular-nums {
            font-variant-numeric: tabular-nums;
        }

        .container {
            width: 100%;
            max-width: 1280px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* 顶部通栏导航 */
        header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(8px);
            border-bottom: 1px solid var(--slate-200);
        }

        .nav-topbar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            border-bottom: 1px solid var(--slate-100);
        }

        .logo-wrap {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: var(--slate-900);
            letter-spacing: -0.02em;
        }

        .logo-icon {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--white);
            font-size: 1.1rem;
            box-shadow: 0 2px 6px rgba(5, 150, 105, 0.3);
        }

        .nav-meta-links {
            display: flex;
            align-items: center;
            gap: 20px;
            font-size: 0.875rem;
            color: var(--slate-600);
        }

        .btn-nav-primary {
            background-color: var(--primary);
            color: var(--white);
            padding: 8px 18px;
            border-radius: 6px;
            font-size: 0.875rem;
            font-weight: 600;
            transition: all 0.2s ease;
            border: 1px solid transparent;
        }

        .btn-nav-primary:hover {
            background-color: var(--primary-hover);
            box-shadow: 0 4px 12px rgba(5, 150, 105, 0.25);
        }

        /* 步骤流式导航条 */
        .process-stepper-bar {
            display: flex;
            align-items: center;
            justify-content: space-between;
            overflow-x: auto;
            padding: 8px 0;
            gap: 12px;
            scrollbar-width: none;
        }

        .process-stepper-bar::-webkit-scrollbar {
            display: none;
        }

        .step-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.825rem;
            color: var(--slate-600);
            padding: 6px 12px;
            border-radius: 20px;
            background: var(--slate-100);
            white-space: nowrap;
            transition: all 0.2s ease;
        }

        .step-item:hover, .step-item.active {
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
        }

        .step-badge {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--slate-300);
            color: var(--slate-700);
            font-size: 0.72rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .step-item:hover .step-badge, .step-item.active .step-badge {
            background: var(--primary);
            color: var(--white);
        }

        .step-separator {
            color: var(--slate-300);
            font-size: 0.75rem;
        }

        /* Section 通用系统 */
        .section-wrap {
            padding: 80px 0;
            position: relative;
        }

        .section-alt {
            background-color: var(--white);
            border-top: 1px solid var(--slate-200);
            border-bottom: 1px solid var(--slate-200);
        }

        .section-dark {
            background-color: var(--dark-bg);
            color: var(--slate-100);
        }

        .section-header {
            margin-bottom: 48px;
            max-width: 840px;
        }

        .section-kicker {
            font-size: 0.85rem;
            text-transform: uppercase;
            font-weight: 700;
            letter-spacing: 0.05em;
            color: var(--primary);
            margin-bottom: 8px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .section-kicker::before {
            content: "";
            width: 8px;
            height: 8px;
            background-color: var(--primary);
            border-radius: 2px;
        }

        .section-title {
            font-size: 2rem;
            line-height: 1.3;
            font-weight: 800;
            color: var(--slate-900);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
        }

        .section-dark .section-title {
            color: var(--white);
        }

        .section-desc {
            font-size: 1.05rem;
            color: var(--slate-600);
            line-height: 1.7;
        }

        .section-dark .section-desc {
            color: var(--slate-300);
        }

        /* 按钮体系 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 24px;
            border-radius: var(--radius-md);
            font-size: 0.95rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
            text-align: center;
            border: 1px solid transparent;
            min-height: 48px;
        }

        .btn-primary {
            background-color: var(--primary);
            color: var(--white);
            box-shadow: 0 4px 14px rgba(5, 150, 105, 0.3);
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(5, 150, 105, 0.4);
        }

        .btn-outline {
            background-color: var(--white);
            color: var(--slate-800);
            border-color: var(--slate-300);
        }

        .btn-outline:hover {
            border-color: var(--slate-800);
            background-color: var(--slate-50);
        }

        .btn-dark {
            background-color: var(--slate-800);
            color: var(--white);
            border-color: var(--slate-700);
        }

        .btn-dark:hover {
            background-color: var(--slate-700);
        }

        /* 1. Hero 工业参数首屏 */
        .hero-banner {
            position: relative;
            background: linear-gradient(180deg, #ffffff 0%, #f1f5f9 100%);
            border-bottom: 1px solid var(--slate-200);
            overflow: hidden;
            padding-top: 60px;
            padding-bottom: 80px;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 48px;
            align-items: center;
        }

        .hero-content h1 {
            font-size: 2.75rem;
            line-height: 1.18;
            font-weight: 850;
            color: var(--slate-900);
            margin-bottom: 20px;
            letter-spacing: -0.03em;
        }

        .hero-content h1 span {
            color: var(--primary);
            display: inline-block;
        }

        .hero-p {
            font-size: 1.125rem;
            color: var(--slate-600);
            line-height: 1.75;
            margin-bottom: 32px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 40px;
        }

        .hero-spec-strip {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            padding-top: 24px;
            border-top: 1px solid var(--slate-200);
        }

        .spec-item {
            display: flex;
            flex-direction: column;
        }

        .spec-num {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--slate-900);
        }

        .spec-label {
            font-size: 0.775rem;
            color: var(--slate-500);
            margin-top: 2px;
        }

        .hero-visual-card {
            background: var(--white);
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-lg);
            overflow: hidden;
            position: relative;
        }

        .card-header-bar {
            background: var(--slate-100);
            padding: 12px 16px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid var(--slate-200);
            font-size: 0.8rem;
            color: var(--slate-700);
            font-weight: 600;
        }

        .mockup-body {
            padding: 20px;
        }

        .live-pulse {
            display: inline-block;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background-color: var(--primary);
            box-shadow: 0 0 0 2px rgba(5, 150, 105, 0.2);
            animation: pulse-ring 2s infinite;
        }

        @keyframes pulse-ring {
            0% { transform: scale(0.95); opacity: 0.8; }
            50% { transform: scale(1.3); opacity: 0.3; }
            100% { transform: scale(0.95); opacity: 0.8; }
        }

        /* 2. 资讯流 + 实时热榜/入口 */
        .content-feed-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 40px;
        }

        .feed-card-item {
            display: grid;
            grid-template-columns: 240px 1fr;
            gap: 20px;
            background: var(--white);
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-md);
            padding: 16px;
            margin-bottom: 20px;
            transition: all 0.2s ease;
        }

        .feed-card-item:hover {
            border-color: var(--slate-300);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .feed-thumb {
            border-radius: 6px;
            overflow: hidden;
            height: 150px;
            background-color: var(--slate-100);
        }

        .feed-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .feed-info {
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .feed-tag {
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 6px;
            display: inline-block;
        }

        .feed-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--slate-900);
            line-height: 1.4;
            margin-bottom: 8px;
        }

        .feed-summary {
            font-size: 0.875rem;
            color: var(--slate-600);
            line-height: 1.6;
        }

        .feed-meta {
            font-size: 0.775rem;
            color: var(--slate-500);
            margin-top: 10px;
            display: flex;
            gap: 16px;
        }

        /* 侧边热榜 */
        .hot-list-wrap {
            background: var(--white);
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-md);
            padding: 24px;
        }

        .hot-list-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--slate-900);
            padding-bottom: 12px;
            border-bottom: 1px solid var(--slate-200);
            margin-bottom: 16px;
        }

        .hot-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px dashed var(--slate-200);
        }

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

        .hot-rank {
            font-size: 1rem;
            font-weight: 800;
            color: var(--slate-400);
            width: 24px;
        }

        .hot-item:nth-child(1) .hot-rank { color: #ef4444; }
        .hot-item:nth-child(2) .hot-rank { color: #f97316; }
        .hot-item:nth-child(3) .hot-rank { color: var(--accent-amber); }

        .hot-item-content h4 {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--slate-800);
            line-height: 1.4;
            margin-bottom: 4px;
        }

        .hot-item-content p {
            font-size: 0.775rem;
            color: var(--slate-500);
        }

        /* 3. 卖点三连核心引擎 (不对称卡片) */
        .engine-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .engine-card {
            background: var(--white);
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }

        .engine-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }

        .engine-badge {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 10px;
            border-radius: 4px;
            background: var(--slate-100);
            color: var(--slate-700);
            margin-bottom: 20px;
            width: fit-content;
        }

        .engine-card h3 {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--slate-900);
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .engine-card p {
            font-size: 0.925rem;
            color: var(--slate-600);
            line-height: 1.65;
            margin-bottom: 24px;
        }

        .engine-stat-callout {
            border-top: 1px solid var(--slate-100);
            padding-top: 16px;
            display: flex;
            align-items: baseline;
            gap: 8px;
        }

        .engine-stat-val {
            font-size: 1.85rem;
            font-weight: 800;
            color: var(--slate-900);
        }

        .engine-stat-desc {
            font-size: 0.8rem;
            color: var(--slate-500);
        }

        /* 4. 架构规范双栏对比 */
        .arch-layout {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 40px;
            align-items: center;
        }

        .param-table-card {
            background: var(--white);
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-md);
            overflow: hidden;
        }

        .param-table-card table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }

        .param-table-card th, .param-table-card td {
            padding: 14px 20px;
            border-bottom: 1px solid var(--slate-200);
            font-size: 0.875rem;
        }

        .param-table-card th {
            background: var(--slate-100);
            color: var(--slate-700);
            font-weight: 700;
        }

        .param-table-card tr:last-child td {
            border-bottom: none;
        }

        .topology-box {
            background: var(--slate-900);
            color: var(--white);
            padding: 32px;
            border-radius: var(--radius-lg);
            font-family: monospace;
            font-size: 0.85rem;
            line-height: 1.8;
            border: 1px solid var(--slate-800);
        }

        .topology-node {
            padding: 10px 14px;
            background: rgba(255, 255, 255, 0.05);
            border-left: 3px solid var(--primary);
            margin-bottom: 12px;
            border-radius: 0 4px 4px 0;
        }

        /* 5. 垂直游戏场景演示 (4 Tab卡片原型) */
        .scene-cards-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .scene-card {
            background: var(--white);
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-md);
            padding: 24px 20px;
            display: flex;
            flex-direction: column;
            transition: all 0.25s ease;
        }

        .scene-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-md);
        }

        .scene-badge-top {
            font-size: 0.72rem;
            color: var(--accent-cyan);
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            margin-bottom: 8px;
        }

        .scene-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--slate-900);
            margin-bottom: 10px;
        }

        .scene-card p {
            font-size: 0.875rem;
            color: var(--slate-600);
            line-height: 1.6;
            margin-bottom: 16px;
        }

        .scene-features {
            list-style: none;
            margin-top: auto;
            border-top: 1px solid var(--slate-100);
            padding-top: 14px;
        }

        .scene-features li {
            font-size: 0.8rem;
            color: var(--slate-600);
            display: flex;
            align-items: center;
            gap: 6px;
            margin-bottom: 6px;
        }

        .scene-features li::before {
            content: "✓";
            color: var(--primary);
            font-weight: bold;
        }

        /* 6. 核心优势六格网格卡片 */
        .six-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .six-card {
            background: var(--white);
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all 0.2s ease;
        }

        .six-card:hover {
            box-shadow: var(--shadow-sm);
            border-color: var(--slate-300);
        }

        .six-card-icon {
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 14px;
        }

        .six-card h4 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--slate-900);
            margin-bottom: 10px;
        }

        .six-card p {
            font-size: 0.875rem;
            color: var(--slate-600);
            line-height: 1.65;
        }

        /* 7. 专题条 (全宽高能Banner) */
        .special-topic-strip {
            background: linear-gradient(90deg, var(--slate-900) 0%, #1e1b4b 100%);
            color: var(--white);
            padding: 48px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }

        .topic-flex {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
        }

        .topic-text h3 {
            font-size: 1.65rem;
            font-weight: 800;
            margin-bottom: 10px;
        }

        .topic-text p {
            font-size: 0.95rem;
            color: var(--slate-300);
            max-width: 680px;
            line-height: 1.6;
        }

        /* 8. 实战案例与哲学 (暗色对比) */
        .case-dark-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }

        .case-quote-box {
            border-left: 3px solid var(--primary);
            padding-left: 20px;
            margin-bottom: 24px;
            font-style: italic;
            color: var(--slate-300);
            font-size: 1rem;
            line-height: 1.7;
        }

        .case-img-wrap {
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--slate-800);
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
        }

        /* 9. 客户实证用户故事 (长卡片) */
        .story-cards-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
        }

        .story-card {
            background: var(--white);
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-md);
            padding: 32px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .story-header {
            margin-bottom: 16px;
        }

        .story-badge {
            font-size: 0.75rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
            display: block;
        }

        .story-card h4 {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--slate-900);
            line-height: 1.4;
        }

        .story-content {
            font-size: 0.925rem;
            color: var(--slate-600);
            line-height: 1.7;
            margin-bottom: 24px;
        }

        .story-metrics-row {
            display: flex;
            gap: 24px;
            padding-top: 20px;
            border-top: 1px solid var(--slate-100);
        }

        .story-m-item {
            display: flex;
            flex-direction: column;
        }

        .story-m-val {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--slate-900);
        }

        .story-m-lbl {
            font-size: 0.75rem;
            color: var(--slate-500);
        }

        /* 10. 成果数据统计条 */
        .kpi-strip {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            background: var(--slate-900);
            color: var(--white);
            padding: 48px;
            border-radius: var(--radius-lg);
            text-align: center;
        }

        .kpi-item h3 {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 6px;
        }

        .kpi-item p {
            font-size: 0.9rem;
            color: var(--slate-300);
        }

        /* 11. 决策版本对比区 */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            align-items: stretch;
        }

        .pricing-card {
            background: var(--white);
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            display: flex;
            flex-direction: column;
            position: relative;
        }

        .pricing-card.featured {
            border-color: var(--primary);
            box-shadow: 0 10px 30px -5px rgba(5, 150, 105, 0.15);
            transform: scale(1.02);
        }

        .featured-tag {
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--primary);
            color: var(--white);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 14px;
            border-radius: 12px;
        }

        .pricing-title {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--slate-900);
            margin-bottom: 8px;
        }

        .pricing-desc {
            font-size: 0.85rem;
            color: var(--slate-500);
            margin-bottom: 20px;
            min-height: 40px;
        }

        .pricing-cost {
            font-size: 2rem;
            font-weight: 800;
            color: var(--slate-900);
            margin-bottom: 24px;
        }

        .pricing-cost span {
            font-size: 0.875rem;
            font-weight: normal;
            color: var(--slate-500);
        }

        .pricing-list {
            list-style: none;
            margin-bottom: 32px;
            flex-grow: 1;
        }

        .pricing-list li {
            font-size: 0.85rem;
            color: var(--slate-600);
            padding: 8px 0;
            border-bottom: 1px solid var(--slate-100);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .pricing-list li::before {
            content: "•";
            color: var(--primary);
            font-size: 1.2rem;
        }

        /* 12. 媒体与行业评测声音 */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .review-card {
            background: var(--white);
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-md);
            padding: 24px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .review-text {
            font-size: 0.9rem;
            color: var(--slate-700);
            line-height: 1.65;
            margin-bottom: 18px;
        }

        .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .author-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background-color: var(--slate-200);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            color: var(--slate-700);
            font-size: 0.85rem;
        }

        .author-info h5 {
            font-size: 0.875rem;
            font-weight: 700;
            color: var(--slate-900);
        }

        .author-info p {
            font-size: 0.75rem;
            color: var(--slate-500);
        }

        /* 13. 常见异议与技术拆解 (手风琴) */
        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--white);
            border: 1px solid var(--slate-200);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
        }

        .faq-question {
            padding: 18px 24px;
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--slate-900);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: var(--white);
            user-select: none;
        }

        .faq-question::after {
            content: "+";
            font-size: 1.4rem;
            color: var(--slate-400);
            font-weight: normal;
            transition: transform 0.2s ease;
        }

        details[open] .faq-question::after {
            content: "−";
            color: var(--primary);
        }

        .faq-answer {
            padding: 0 24px 20px 24px;
            font-size: 0.925rem;
            color: var(--slate-600);
            line-height: 1.7;
            border-top: 1px solid var(--slate-100);
            padding-top: 14px;
        }

        /* 14. 终极行动保障条与页脚 */
        .guarantee-bar {
            background: var(--slate-100);
            border-top: 1px solid var(--slate-200);
            border-bottom: 1px solid var(--slate-200);
            padding: 32px 0;
        }

        .guarantee-flex {
            display: flex;
            justify-content: space-around;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
        }

        .g-item {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .g-icon {
            font-size: 1.5rem;
            color: var(--primary);
        }

        .g-title {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--slate-900);
        }

        .g-desc {
            font-size: 0.8rem;
            color: var(--slate-500);
        }

        /* 页脚 */
        footer {
            background-color: var(--dark-bg);
            color: var(--slate-400);
            padding: 60px 0 30px 0;
            font-size: 0.875rem;
            border-top: 1px solid var(--slate-800);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 48px;
        }

        .footer-col h5 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--white);
            margin-bottom: 16px;
        }

        .footer-col ul {
            list-style: none;
        }

        .footer-col ul li {
            margin-bottom: 10px;
        }

        .footer-col ul li a:hover {
            color: var(--white);
        }

        .footer-brand p {
            margin-top: 12px;
            line-height: 1.6;
            color: var(--slate-400);
            font-size: 0.85rem;
        }

        .footer-bottom {
            padding-top: 24px;
            border-top: 1px solid var(--slate-800);
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 0.8rem;
            color: var(--slate-500);
        }

        /* 悬浮转化条 (Sticky Bottom CTA) */
        .sticky-cta-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(15, 23, 42, 0.95);
            backdrop-filter: blur(8px);
            border-top: 1px solid var(--slate-800);
            padding: 12px 24px;
            z-index: 99;
            box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.15);
        }

        .sticky-inner {
            max-width: 1280px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
        }

        .sticky-text {
            color: var(--white);
            font-size: 0.9rem;
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .sticky-tag {
            background: var(--primary);
            color: var(--white);
            font-size: 0.72rem;
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 700;
        }

        /* 响应式断点 */
        @media (max-width: 1024px) {
            .hero-grid, .content-feed-grid, .arch-layout, .case-dark-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .scene-cards-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .six-grid, .engine-grid, .pricing-grid, .review-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .nav-meta-links {
                display: none;
            }
            .hero-content h1 {
                font-size: 2.1rem;
            }
            .engine-grid, .six-grid, .pricing-grid, .review-grid, .scene-cards-grid, .story-cards-wrap {
                grid-template-columns: 1fr;
            }
            .pricing-card.featured {
                transform: none;
            }
            .kpi-strip {
                grid-template-columns: repeat(2, 1fr);
                padding: 28px 20px;
            }
            .feed-card-item {
                grid-template-columns: 1fr;
            }
            .feed-thumb {
                height: 180px;
            }
            .topic-flex {
                flex-direction: column;
                align-items: flex-start;
            }
            .sticky-cta-bar {
                display: none; /* 移动端让出纵向空间 */
            }
        }

        @media (max-width: 520px) {
            .hero-spec-strip {
                grid-template-columns: 1fr;
            }
            .kpi-strip {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }