/* ========== CSS Reset & 变量 ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        :root {
            --primary: #6366F1;
            --primary-deep: #4F46E5;
            --primary-dark: #3730A3;
            --accent: #14B8A6;
            --accent-glow: #5EEAD4;
            --bg: #F9FAFB;
            --surface: #FFFFFF;
            --surface-alt: #F1F5F9;
            --text: #1E293B;
            --text-secondary: #64748B;
            --text-muted: #94A3B8;
            --border: #E2E8F0;
            --border-light: #F1F5F9;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08), 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-xl: 0 20px 48px rgba(0, 0, 0, 0.1), 0 4px 16px rgba(0, 0, 0, 0.06);
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --font-mono: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
        }

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.7;
            min-height: 100vh;
        }

        /* ==========  Header ========== */
        header {
            background: var(--surface);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            background: rgba(255, 255, 255, 0.88);
            box-shadow: var(--shadow-sm);
        }
        .header-box {
            max-width: 1280px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 24px;
            height: 60px;
            gap: 20px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            color: var(--text);
            font-weight: 700;
            font-size: 1.1rem;
            flex-shrink: 0;
            letter-spacing: -0.3px;
            transition: var(--transition);
        }
        .brand-logo:hover {
            color: var(--primary);
        }
        .brand-logo img {
            width: 34px;
            height: 34px;
            border-radius: 8px;
            object-fit: contain;
        }
        .brand-dot {
            display: inline-block;
            width: 7px;
            height: 7px;
            background: var(--accent);
            border-radius: 50%;
            margin: 0 2px;
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.4;
                transform: scale(1.6);
            }
        }
        nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
            justify-content: flex-end;
        }
        nav a {
            text-decoration: none;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.9rem;
            padding: 8px 14px;
            border-radius: 8px;
            transition: var(--transition);
            white-space: nowrap;
            position: relative;
        }
        nav a:hover {
            color: var(--primary);
            background: #EEF2FF;
        }
        nav a.current-tab {
            color: var(--primary);
            background: #EEF2FF;
            font-weight: 600;
        }
        .nav-accent {
            background: linear-gradient(135deg, #EEF2FF, #E0F2FE);
            color: var(--primary-deep) !important;
            font-weight: 600 !important;
        }
        .nav-accent:hover {
            background: linear-gradient(135deg, #E0E7FF, #CFFAFE) !important;
        }

        /* ========== Main Container ========== */
        main {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== Section 通用 ========== */
        .section-inner {
            max-width: 1100px;
            margin: 0 auto;
            padding: 60px 0;
        }
        section h2 {
            font-size: 2rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            text-align: center;
            margin-bottom: 12px;
            color: var(--text);
        }
        .section-lead {
            text-align: center;
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 680px;
            margin: 0 auto 40px;
            line-height: 1.8;
        }

        /* ========== Hero ========== */
        .hero-section {
            padding: 48px 0 56px;
        }
        .hero-wrapper {
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }
        .hero-badge {
            display: inline-block;
            background: linear-gradient(135deg, #EEF2FF, #E0F2FE);
            color: var(--primary-deep);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 6px 16px;
            border-radius: 20px;
            margin-bottom: 20px;
            letter-spacing: 0.3px;
            border: 1px solid #C7D2FE;
        }
        .hero-badge .blink-dot {
            display: inline-block;
            width: 8px;
            height: 8px;
            background: #10B981;
            border-radius: 50%;
            margin-right: 6px;
            animation: pulse-dot 1.8s infinite;
            vertical-align: middle;
            position: relative;
            top: -1px;
        }
        .hero-wrapper h1 {
            font-size: 2.8rem;
            font-weight: 900;
            letter-spacing: -1px;
            line-height: 1.25;
            margin-bottom: 16px;
            color: var(--text);
        }
        .hero-wrapper h1 .gradient-text {
            background: linear-gradient(135deg, #6366F1, #14B8A6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-desc {
            font-size: 1.08rem;
            color: var(--text-secondary);
            line-height: 1.85;
            margin-bottom: 32px;
            max-width: 620px;
            margin-left: auto;
            margin-right: auto;
        }
        .hero-actions {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
            margin-bottom: 36px;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, #6366F1, #4F46E5);
            color: #fff;
            font-weight: 700;
            padding: 14px 28px;
            border-radius: 28px;
            text-decoration: none;
            font-size: 1rem;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
            border: none;
            cursor: pointer;
            letter-spacing: 0.2px;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(99, 102, 241, 0.4);
            background: linear-gradient(135deg, #4F46E5, #3730A3);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--surface);
            color: var(--primary-deep);
            font-weight: 600;
            padding: 14px 28px;
            border-radius: 28px;
            text-decoration: none;
            font-size: 1rem;
            transition: var(--transition);
            border: 2px solid #C7D2FE;
            letter-spacing: 0.2px;
        }
        .btn-outline:hover {
            border-color: var(--primary);
            background: #EEF2FF;
            transform: translateY(-2px);
        }
        .center-btn {
            display: table;
            margin: 32px auto 0;
        }
        .hero-stats {
            display: flex;
            gap: 32px;
            justify-content: center;
            flex-wrap: wrap;
            padding-top: 8px;
        }
        .stat-item {
            text-align: center;
            min-width: 80px;
        }
        .stat-item strong {
            display: block;
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary-deep);
            letter-spacing: -0.5px;
        }
        .stat-item span {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* ========== 下载矩阵 ========== */
        .section-download-matrix {
            background: var(--surface);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow);
            margin-bottom: 20px;
        }
        .section-download-matrix .section-inner {
            padding: 52px 32px;
        }
        .platform-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
            gap: 18px;
        }
        .platform-card {
            background: var(--bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            text-align: center;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .platform-card::before {
            content: '';
            position: absolute;
            top: -30px;
            right: -30px;
            width: 80px;
            height: 80px;
            background: radial-gradient(circle, rgba(99, 102, 241, 0.06) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .platform-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: #C7D2FE;
        }
        .platform-icon {
            font-size: 2.4rem;
            display: block;
            margin-bottom: 12px;
        }
        .platform-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
        }
        .platform-card p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 14px;
            min-height: 48px;
        }
        .card-link {
            display: inline-block;
            font-weight: 600;
            color: var(--primary);
            text-decoration: none;
            font-size: 0.9rem;
            transition: var(--transition);
            padding: 6px 14px;
            border-radius: 20px;
            background: #EEF2FF;
        }
        .card-link:hover {
            background: #E0E7FF;
            color: var(--primary-dark);
        }

        /* ========== 三步部署 ========== */
        .section-quickstart {
            margin-bottom: 20px;
        }
        .steps-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }
        .step-block {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            box-shadow: var(--shadow);
            position: relative;
            border-left: 4px solid transparent;
            transition: var(--transition);
        }
        .step-block:nth-child(1) {
            border-left-color: #6366F1;
        }
        .step-block:nth-child(2) {
            border-left-color: #14B8A6;
        }
        .step-block:nth-child(3) {
            border-left-color: #F59E0B;
        }
        .step-block:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
        }
        .step-num {
            display: inline-block;
            font-size: 3rem;
            font-weight: 900;
            letter-spacing: -2px;
            color: #E2E8F0;
            line-height: 1;
            margin-bottom: 8px;
        }
        .step-block:nth-child(1) .step-num {
            color: #C7D2FE;
        }
        .step-block:nth-child(2) .step-num {
            color: #99F6E4;
        }
        .step-block:nth-child(3) .step-num {
            color: #FDE68A;
        }
        .step-block h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .step-block p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .step-block a {
            color: var(--primary);
            font-weight: 600;
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        /* ========== 规则引擎 ========== */
        .section-rules-preview {
            background: var(--surface);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow);
            margin-bottom: 20px;
        }
        .section-rules-preview .section-inner {
            padding: 52px 32px;
        }
        .rules-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 20px;
            margin-bottom: 12px;
        }
        .rule-item {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 22px 20px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .rule-item:hover {
            box-shadow: var(--shadow);
            border-color: #C7D2FE;
        }
        .rule-item h3 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .rule-item p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .rule-item code {
            background: #E2E8F0;
            padding: 2px 7px;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-size: 0.8rem;
            color: var(--primary-dark);
        }

        /* ========== 配置指南 ========== */
        .section-guide-highlights {
            margin-bottom: 20px;
        }
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 18px;
        }
        .guide-card {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            text-decoration: none;
            color: var(--text);
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid transparent;
            display: block;
        }
        .guide-card:hover {
            border-color: #C7D2FE;
            box-shadow: var(--shadow-lg);
            transform: translateY(-3px);
        }
        .guide-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--primary-deep);
        }
        .guide-card p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ========== 场景矩阵 ========== */
        .section-scenarios {
            background: var(--surface);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow);
            margin-bottom: 20px;
        }
        .section-scenarios .section-inner {
            padding: 52px 32px;
        }
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 18px;
        }
        .scenario-card {
            background: var(--bg);
            border-radius: var(--radius);
            padding: 22px 20px;
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .scenario-card:hover {
            box-shadow: var(--shadow);
            border-color: #C7D2FE;
        }
        .scenario-card h3 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .scenario-card p {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ========== 信任指标 ========== */
        .section-trust {
            margin-bottom: 20px;
        }
        .trust-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 18px;
        }
        .trust-item {
            background: var(--surface);
            border-radius: var(--radius-lg);
            padding: 24px 20px;
            text-align: center;
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .trust-item:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .trust-item strong {
            display: block;
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--primary-deep);
        }
        .trust-item p {
            font-size: 0.85rem;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ========== FAQ入口 ========== */
        .section-faq-entry {
            background: var(--surface);
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow);
            margin-bottom: 20px;
        }
        .section-faq-entry .section-inner {
            padding: 52px 32px;
        }
        .faq-quick-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 10px;
            margin-bottom: 8px;
        }
        .faq-quick-item {
            display: block;
            background: var(--bg);
            padding: 14px 18px;
            border-radius: 10px;
            text-decoration: none;
            color: var(--text);
            font-weight: 500;
            font-size: 0.9rem;
            transition: var(--transition);
            border: 1px solid var(--border-light);
        }
        .faq-quick-item:hover {
            background: #EEF2FF;
            border-color: #C7D2FE;
            color: var(--primary-deep);
            transform: translateX(3px);
        }

        /* ========== Footer ========== */
        footer {
            background: #1E293B;
            color: #CBD5E1;
            margin-top: 32px;
            padding: 48px 24px 32px;
        }
        .footer-wrapper {
            max-width: 1280px;
            margin: 0 auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 28px;
            margin-bottom: 32px;
        }
        .footer-section h5 {
            font-size: 0.95rem;
            font-weight: 700;
            color: #F1F5F9;
            margin-bottom: 12px;
            letter-spacing: 0.3px;
        }
        .footer-section ul {
            list-style: none;
        }
        .footer-section ul li {
            margin-bottom: 6px;
        }
        .footer-section ul li a {
            color: #94A3B8;
            text-decoration: none;
            font-size: 0.85rem;
            transition: var(--transition);
        }
        .footer-section ul li a:hover {
            color: #E2E8F0;
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .footer-legal {
            border-top: 1px solid #334155;
            padding-top: 20px;
            text-align: center;
            font-size: 0.8rem;
            color: #64748B;
            line-height: 1.8;
        }
        .footer-legal p {
            margin-bottom: 4px;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 768px) {
            .header-box {
                flex-direction: column;
                height: auto;
                padding: 12px 16px;
                gap: 10px;
            }
            nav {
                gap: 2px;
            }
            nav a {
                font-size: 0.8rem;
                padding: 6px 10px;
            }
            .hero-wrapper h1 {
                font-size: 1.9rem;
            }
            .hero-desc {
                font-size: 0.95rem;
            }
            section h2 {
                font-size: 1.5rem;
            }
            .section-inner {
                padding: 36px 16px;
            }
            .section-download-matrix .section-inner,
            .section-rules-preview .section-inner,
            .section-scenarios .section-inner,
            .section-faq-entry .section-inner {
                padding: 36px 16px;
            }
            .hero-stats {
                gap: 18px;
            }
            .stat-item strong {
                font-size: 1.4rem;
            }
            .platform-grid {
                grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
                gap: 12px;
            }
            .platform-card {
                padding: 16px 12px;
            }
            .platform-icon {
                font-size: 1.8rem;
            }
        }
        @media (max-width: 480px) {
            .hero-wrapper h1 {
                font-size: 1.55rem;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .btn-primary,
            .btn-outline {
                width: 100%;
                justify-content: center;
                text-align: center;
                padding: 12px 20px;
                font-size: 0.9rem;
            }
            .steps-row {
                grid-template-columns: 1fr;
            }
            .platform-grid {
                grid-template-columns: 1fr 1fr;
            }
        }