/* roulang page: index */
:root {
            --brand-primary: #0F4C5C;
            --brand-accent: #E36414;
            --brand-accent-hover: #C5530D;
            --brand-support: #5C9EAD;
            --bg-light: #F8F9FA;
            --bg-white: #FFFFFF;
            --bg-dark: #1A1D20;
            --bg-dark-card: #24292E;
            --text-main: #1E252B;
            --text-sub: #55606A;
            --text-muted: #8C96A0;
            --border-color: #E2E8F0;
            --border-dark: #343A40;
            --shadow-sm: 0 4px 12px rgba(15, 76, 92, 0.05);
            --shadow-md: 0 8px 24px rgba(15, 76, 92, 0.08);
            --shadow-lg: 0 16px 36px rgba(15, 76, 92, 0.12);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-full: 9999px;
            --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            -webkit-tap-highlight-color: transparent;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--bg-white);
            color: var(--text-main);
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }

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

        button, input {
            font-family: inherit;
        }

        .container {
            width: 100%;
            max-width: 1240px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* 顶部双行 Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background-color: var(--bg-white);
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
        }

        .top-bar {
            background-color: var(--bg-dark);
            color: #C1C7CD;
            font-size: 0.8125rem;
            padding: 6px 0;
            border-bottom: 1px solid var(--border-dark);
        }

        .top-bar-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .top-bar-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .top-bar-badge::before {
            content: "";
            display: inline-block;
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background-color: #2ECC71;
            box-shadow: 0 0 6px #2ECC71;
        }

        .main-nav-bar {
            padding: 16px 0;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(8px);
        }

        .main-nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--brand-primary);
            letter-spacing: -0.5px;
        }

        .brand-logo svg {
            width: 32px;
            height: 32px;
            fill: var(--brand-accent);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-main);
            position: relative;
            padding: 6px 0;
        }

        .nav-links a:hover, .nav-links a.active {
            color: var(--brand-accent);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .btn-text {
            font-size: 0.9375rem;
            font-weight: 500;
            color: var(--brand-primary);
            padding: 8px 12px;
        }

        .btn-text:hover {
            color: var(--brand-accent);
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: linear-gradient(135deg, var(--brand-accent) 0%, #D85607 100%);
            color: #FFFFFF;
            font-size: 0.9375rem;
            font-weight: 600;
            padding: 10px 24px;
            border-radius: var(--radius-full);
            box-shadow: 0 4px 14px rgba(227, 100, 20, 0.3);
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-primary:hover {
            background: linear-gradient(135deg, #F06E1E 0%, var(--brand-accent) 100%);
            transform: translateY(-2px);
            box-shadow: 0 6px 18px rgba(227, 100, 20, 0.4);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background-color: #FFFFFF;
            color: var(--brand-primary);
            border: 1px solid var(--border-color);
            font-size: 0.9375rem;
            font-weight: 600;
            padding: 10px 22px;
            border-radius: var(--radius-full);
            cursor: pointer;
            transition: var(--transition);
        }

        .btn-secondary:hover {
            border-color: var(--brand-primary);
            background-color: #F0F7F9;
        }

        /* 板块公用 */
        section {
            padding: 80px 0;
            position: relative;
        }

        .section-header {
            max-width: 780px;
            margin: 0 auto 52px;
            text-align: center;
        }

        .section-tag {
            display: inline-block;
            background-color: rgba(92, 158, 173, 0.12);
            color: var(--brand-primary);
            font-size: 0.8125rem;
            font-weight: 700;
            letter-spacing: 1px;
            text-transform: uppercase;
            padding: 5px 14px;
            border-radius: var(--radius-full);
            margin-bottom: 12px;
        }

        .section-title {
            font-size: 2.125rem;
            font-weight: 700;
            color: var(--text-main);
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .section-desc {
            font-size: 1.0625rem;
            color: var(--text-sub);
            line-height: 1.7;
        }

        /* 1. 卡片堆叠首屏 (Hero) */
        .hero-section {
            background: linear-gradient(180deg, #F0F6F8 0%, #FFFFFF 100%);
            padding: 60px 0 80px;
            overflow: hidden;
        }

        .hero-content {
            text-align: center;
            max-width: 860px;
            margin: 0 auto 48px;
        }

        .hero-title {
            font-size: 2.75rem;
            line-height: 1.25;
            color: var(--brand-primary);
            font-weight: 800;
            margin-bottom: 20px;
            letter-spacing: -1px;
        }

        .hero-title span {
            color: var(--brand-accent);
        }

        .hero-intro {
            font-size: 1.125rem;
            color: var(--text-sub);
            margin-bottom: 32px;
            line-height: 1.8;
        }

        .hero-actions {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            margin-bottom: 32px;
            flex-wrap: wrap;
        }

        .hero-badges {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 24px;
            font-size: 0.875rem;
            color: var(--text-muted);
        }

        .hero-badges span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        /* 卡片堆叠舞台 */
        .card-stack-stage {
            position: relative;
            max-width: 1040px;
            height: 440px;
            margin: 0 auto;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .stack-card {
            position: absolute;
            border-radius: var(--radius-lg);
            background: var(--bg-white);
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
        }

        .stack-card-side-left {
            width: 380px;
            height: 340px;
            left: 20px;
            transform: scale(0.92) rotate(-4deg);
            z-index: 1;
            opacity: 0.85;
        }

        .stack-card-side-right {
            width: 380px;
            height: 340px;
            right: 20px;
            transform: scale(0.92) rotate(4deg);
            z-index: 1;
            opacity: 0.85;
        }

        .stack-card-main {
            width: 600px;
            height: 400px;
            z-index: 2;
            box-shadow: 0 20px 45px rgba(15, 76, 92, 0.16);
            border-color: rgba(92, 158, 173, 0.4);
        }

        .stack-card:hover {
            transform: scale(0.98) rotate(0deg);
            z-index: 3;
            opacity: 1;
        }

        .stack-card-main:hover {
            transform: scale(1.02);
        }

        .card-img-wrap {
            width: 100%;
            height: 100%;
            position: relative;
        }

        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .card-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 20px;
            background: linear-gradient(180deg, transparent 0%, rgba(15, 76, 92, 0.95) 100%);
            color: #FFFFFF;
        }

        .card-overlay-tag {
            font-size: 0.75rem;
            color: var(--brand-accent);
            text-transform: uppercase;
            font-weight: 700;
        }

        .card-overlay-title {
            font-size: 1.125rem;
            font-weight: 700;
            margin-top: 4px;
        }

        /* 2. 客户案例 */
        .section-cases {
            background-color: var(--bg-white);
        }

        .cases-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }

        .case-card {
            background-color: var(--bg-light);
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }

        .case-card:hover {
            box-shadow: var(--shadow-md);
            border-color: var(--brand-support);
        }

        .case-card-thumb {
            height: 240px;
            width: 100%;
            overflow: hidden;
        }

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

        .case-card:hover .case-card-thumb img {
            transform: scale(1.04);
        }

        .case-card-body {
            padding: 32px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .case-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
            font-size: 0.875rem;
            color: var(--brand-accent);
            font-weight: 600;
        }

        .case-title {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
        }

        .case-desc {
            font-size: 0.95rem;
            color: var(--text-sub);
            margin-bottom: 24px;
            line-height: 1.7;
            flex: 1;
        }

        .case-stats {
            display: flex;
            gap: 20px;
            border-top: 1px solid var(--border-color);
            padding-top: 16px;
        }

        .case-stat-item strong {
            display: block;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--brand-primary);
        }

        .case-stat-item span {
            font-size: 0.8125rem;
            color: var(--text-muted);
        }

        /* 3. 结果数据 */
        .section-metrics {
            background: linear-gradient(135deg, var(--brand-primary) 0%, #0A323D 100%);
            color: #FFFFFF;
            padding: 64px 0;
        }

        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }

        .metric-item {
            padding: 16px;
        }

        .metric-number {
            font-size: 3rem;
            font-weight: 800;
            color: var(--brand-accent);
            line-height: 1.1;
            margin-bottom: 8px;
            letter-spacing: -1px;
        }

        .metric-label {
            font-size: 1.125rem;
            font-weight: 600;
            margin-bottom: 6px;
        }

        .metric-desc {
            font-size: 0.875rem;
            color: rgba(255, 255, 255, 0.7);
        }

        /* 4. 前后对比 */
        .section-compare {
            background-color: var(--bg-light);
        }

        .compare-table-wrap {
            max-width: 980px;
            margin: 0 auto;
            background: #FFFFFF;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            overflow: hidden;
        }

        .compare-row {
            display: grid;
            grid-template-columns: 240px 1fr 1fr;
            border-bottom: 1px solid var(--border-color);
        }

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

        .compare-row.compare-head {
            background-color: #F1F6F8;
            font-weight: 700;
            font-size: 1.05rem;
            color: var(--brand-primary);
        }

        .compare-cell {
            padding: 20px 24px;
            display: flex;
            align-items: center;
            font-size: 0.95rem;
        }

        .compare-cell.col-title {
            font-weight: 600;
            color: var(--text-main);
            background-color: rgba(248, 249, 250, 0.5);
            border-right: 1px solid var(--border-color);
        }

        .compare-cell.col-old {
            color: var(--text-sub);
            border-right: 1px solid var(--border-color);
        }

        .compare-cell.col-new {
            color: var(--brand-primary);
            font-weight: 600;
            background-color: rgba(227, 100, 20, 0.03);
        }

        .compare-cell.col-new svg {
            width: 18px;
            height: 18px;
            fill: var(--brand-accent);
            margin-right: 8px;
            flex-shrink: 0;
        }

        /* 5. 方法说明 */
        .section-method {
            background-color: var(--bg-white);
        }

        .steps-flow {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }

        .step-card {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            position: relative;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

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

        .step-num {
            font-size: 2.25rem;
            font-weight: 800;
            color: rgba(15, 76, 92, 0.15);
            line-height: 1;
            margin-bottom: 16px;
        }

        .step-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--brand-primary);
            margin-bottom: 12px;
        }

        .step-desc {
            font-size: 0.9rem;
            color: var(--text-sub);
            line-height: 1.65;
        }

        /* 6. 卖点三连 */
        .section-features {
            background-color: var(--bg-light);
        }

        .features-triplet {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }

        .feature-box {
            background: #FFFFFF;
            border-radius: var(--radius-lg);
            padding: 40px 32px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

        .feature-box:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: var(--brand-accent);
        }

        .feature-icon-wrap {
            width: 56px;
            height: 56px;
            border-radius: 12px;
            background: rgba(227, 100, 20, 0.1);
            color: var(--brand-accent);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 24px;
        }

        .feature-icon-wrap svg {
            width: 28px;
            height: 28px;
            fill: currentColor;
        }

        .feature-box h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--brand-primary);
            margin-bottom: 14px;
        }

        .feature-box p {
            font-size: 0.95rem;
            color: var(--text-sub);
            line-height: 1.7;
        }

        /* 7. 方案矩阵 */
        .section-matrix {
            background-color: var(--bg-white);
        }

        .matrix-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            align-items: stretch;
        }

        .matrix-card {
            border-radius: var(--radius-lg);
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            padding: 40px 32px;
            display: flex;
            flex-direction: column;
            position: relative;
            transition: var(--transition);
        }

        .matrix-card.popular {
            border-color: var(--brand-accent);
            box-shadow: var(--shadow-lg);
            transform: scale(1.03);
            background: linear-gradient(180deg, #FFFFFF 0%, #FFFDFB 100%);
        }

        .matrix-badge {
            position: absolute;
            top: -14px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--brand-accent);
            color: #FFFFFF;
            font-size: 0.75rem;
            font-weight: 700;
            padding: 4px 16px;
            border-radius: var(--radius-full);
            letter-spacing: 1px;
        }

        .matrix-type {
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }

        .matrix-target {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin-bottom: 24px;
        }

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

        .matrix-list li {
            font-size: 0.925rem;
            color: var(--text-sub);
            padding: 10px 0;
            border-bottom: 1px dashed var(--border-color);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .matrix-list li::before {
            content: "✓";
            color: var(--brand-accent);
            font-weight: 800;
        }

        /* 8. 核心理念与技术架构 */
        .section-architecture {
            background-color: var(--bg-dark);
            color: #FFFFFF;
        }

        .section-architecture .section-title {
            color: #FFFFFF;
        }

        .section-architecture .section-desc {
            color: #A0AEC0;
        }

        .arch-layout {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }

        .arch-content h3 {
            font-size: 1.5rem;
            margin-bottom: 16px;
            color: #FFFFFF;
        }

        .arch-content p {
            font-size: 1rem;
            color: #C1C7CD;
            margin-bottom: 24px;
            line-height: 1.8;
        }

        .arch-spec-list {
            list-style: none;
        }

        .arch-spec-list li {
            margin-bottom: 16px;
            display: flex;
            gap: 14px;
        }

        .arch-spec-list strong {
            display: block;
            color: #FFFFFF;
            font-size: 1.05rem;
            margin-bottom: 4px;
        }

        .arch-spec-list span {
            color: #8C96A0;
            font-size: 0.9rem;
        }

        .arch-visual {
            background: var(--bg-dark-card);
            border: 1px solid var(--border-dark);
            border-radius: var(--radius-lg);
            padding: 24px;
            position: relative;
        }

        .arch-visual img {
            border-radius: var(--radius-md);
            width: 100%;
        }

        /* 9. 线下活动与现场调度 (蓝图注入点) */
        .section-field-ops {
            background-color: var(--bg-white);
        }

        .ops-grid {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 48px;
            align-items: center;
        }

        .ops-info-box {
            background: var(--bg-light);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 36px;
        }

        .ops-info-box h3 {
            font-size: 1.4rem;
            color: var(--brand-primary);
            margin-bottom: 16px;
        }

        .ops-meta-row {
            margin-bottom: 16px;
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 0.95rem;
            color: var(--text-sub);
        }

        .ops-meta-row strong {
            color: var(--text-main);
            min-width: 90px;
        }

        .ops-steps {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            margin-top: 24px;
        }

        .ops-step-item {
            background: #FFFFFF;
            padding: 16px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-color);
        }

        .ops-step-item h4 {
            font-size: 1rem;
            color: var(--brand-accent);
            margin-bottom: 4px;
        }

        .ops-step-item p {
            font-size: 0.85rem;
            color: var(--text-sub);
        }

        /* 10. 资讯与路网内参 */
        .section-insights {
            background-color: var(--bg-light);
        }

        .insights-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }

        .insight-card {
            background: #FFFFFF;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-color);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            transition: var(--transition);
        }

        .insight-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }

        .insight-thumb {
            height: 200px;
            width: 100%;
        }

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

        .insight-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .insight-date {
            font-size: 0.8125rem;
            color: var(--text-muted);
            margin-bottom: 8px;
        }

        .insight-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .insight-summary {
            font-size: 0.9rem;
            color: var(--text-sub);
            line-height: 1.65;
            margin-bottom: 16px;
            flex: 1;
        }

        .insight-link {
            font-size: 0.875rem;
            font-weight: 600;
            color: var(--brand-primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .insight-link:hover {
            color: var(--brand-accent);
        }

        /* 11. 异议拆解 (FAQ) */
        .section-faq {
            background-color: var(--bg-white);
        }

        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-item {
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            margin-bottom: 16px;
            overflow: hidden;
            background: #FFFFFF;
        }

        .faq-toggle {
            width: 100%;
            text-align: left;
            padding: 20px 24px;
            background: none;
            border: none;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--text-main);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .faq-toggle:hover {
            color: var(--brand-accent);
        }

        .faq-icon {
            font-size: 1.25rem;
            color: var(--brand-support);
            transition: transform 0.25s ease;
        }

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

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            padding: 0 24px;
            background-color: var(--bg-light);
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 16px 24px 24px;
        }

        .faq-answer p {
            font-size: 0.95rem;
            color: var(--text-sub);
            line-height: 1.7;
        }

        /* 12. 保障条 */
        .section-guarantee {
            background-color: #F1F6F8;
            padding: 48px 0;
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
        }

        .guarantee-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .guarantee-item {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        .guarantee-icon {
            width: 48px;
            height: 48px;
            background: #FFFFFF;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--brand-primary);
            box-shadow: var(--shadow-sm);
            flex-shrink: 0;
        }

        .guarantee-icon svg {
            width: 24px;
            height: 24px;
            fill: currentColor;
        }

        .guarantee-text h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--brand-primary);
            margin-bottom: 2px;
        }

        .guarantee-text p {
            font-size: 0.8125rem;
            color: var(--text-sub);
        }

        /* 13. 底部咨询入口与收口转化 (双CTA) */
        .section-cta-banner {
            background: linear-gradient(135deg, var(--brand-primary) 0%, #153A44 100%);
            color: #FFFFFF;
            text-align: center;
            padding: 80px 0;
            position: relative;
            overflow: hidden;
        }

        .cta-content {
            position: relative;
            z-index: 2;
            max-width: 760px;
            margin: 0 auto;
        }

        .cta-title {
            font-size: 2.25rem;
            font-weight: 800;
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .cta-desc {
            font-size: 1.05rem;
            color: #C1C7CD;
            margin-bottom: 36px;
            line-height: 1.7;
        }

        .cta-form-box {
            display: flex;
            max-width: 520px;
            margin: 0 auto 20px;
            gap: 12px;
        }

        .cta-input {
            flex: 1;
            padding: 14px 20px;
            border-radius: var(--radius-full);
            border: 1px solid rgba(255, 255, 255, 0.2);
            background: rgba(255, 255, 255, 0.95);
            font-size: 0.95rem;
            color: var(--text-main);
            outline: none;
        }

        .cta-input:focus {
            background: #FFFFFF;
            border-color: var(--brand-accent);
        }

        .cta-note {
            font-size: 0.8125rem;
            color: rgba(255, 255, 255, 0.6);
        }

        /* 页脚 */
        .site-footer {
            background-color: var(--bg-dark);
            color: #8C96A0;
            padding: 64px 0 32px;
            font-size: 0.875rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 48px;
        }

        .footer-brand h3 {
            color: #FFFFFF;
            font-size: 1.3rem;
            margin-bottom: 14px;
        }

        .footer-brand p {
            line-height: 1.7;
            margin-bottom: 20px;
        }

        .footer-col h4 {
            color: #FFFFFF;
            font-size: 1rem;
            margin-bottom: 18px;
            font-weight: 600;
        }

        .footer-links {
            list-style: none;
        }

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

        .footer-links a:hover {
            color: #FFFFFF;
        }

        .footer-contact-item {
            margin-bottom: 10px;
            line-height: 1.6;
        }

        .footer-bottom {
            border-top: 1px solid var(--border-dark);
            padding-top: 28px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
        }

        .footer-icp {
            display: flex;
            align-items: center;
            gap: 16px;
        }

        /* 移动端汉堡与自适应 */
        .mobile-menu-btn {
            display: none;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }

        .mobile-menu-btn span {
            display: block;
            width: 24px;
            height: 2px;
            background-color: var(--text-main);
            margin: 5px 0;
        }

        @media (max-width: 1024px) {
            .card-stack-stage {
                height: 380px;
            }
            .stack-card-main {
                width: 480px;
                height: 320px;
            }
            .stack-card-side-left, .stack-card-side-right {
                width: 300px;
                height: 260px;
            }
            .features-triplet, .matrix-grid, .insights-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .matrix-card.popular {
                transform: none;
            }
        }

        @media (max-width: 768px) {
            section {
                padding: 48px 0;
            }
            .top-bar {
                display: none;
            }
            .mobile-menu-btn {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: #FFFFFF;
                flex-direction: column;
                padding: 20px;
                box-shadow: var(--shadow-md);
                border-top: 1px solid var(--border-color);
                gap: 16px;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-actions {
                display: none;
            }
            .hero-title {
                font-size: 1.85rem;
            }
            .hero-section {
                padding: 40px 0 60px;
            }
            .card-stack-stage {
                height: 260px;
            }
            .stack-card-side-left, .stack-card-side-right {
                display: none;
            }
            .stack-card-main {
                width: 100%;
                max-width: 340px;
                height: 240px;
            }
            .cases-grid, .steps-flow, .features-triplet, .matrix-grid, .insights-grid, .arch-layout, .ops-grid {
                grid-template-columns: 1fr;
            }
            .metrics-grid, .guarantee-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
            .compare-row {
                grid-template-columns: 110px 1fr 1fr;
            }
            .compare-cell {
                padding: 12px;
                font-size: 0.85rem;
            }
            .cta-form-box {
                flex-direction: column;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 480px) {
            .hero-badges {
                flex-direction: column;
                gap: 8px;
            }
            .metrics-grid {
                grid-template-columns: 1fr;
            }
            .ops-steps {
                grid-template-columns: 1fr;
            }
        }