/* roulang page: index */
:root {
            --primary: #1a56db;
            --primary-dark: #1e40af;
            --primary-darker: #1a3c8a;
            --primary-light: #dbeafe;
            --primary-lighter: #eff6ff;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --accent-light: #fef3c7;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --bg-dark-secondary: #1e293b;
            --text: #1e293b;
            --text-light: #64748b;
            --text-lighter: #94a3b8;
            --text-white: #f1f5f9;
            --text-white-muted: #cbd5e1;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-xs: 6px;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-md: 14px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --radius-2xl: 24px;
            --radius-full: 50px;
            --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.1);
            --shadow-xl: 0 24px 56px rgba(0, 0, 0, 0.12);
            --transition-fast: 0.15s ease;
            --transition: 0.25s ease;
            --transition-slow: 0.35s ease;
            --font-xs: 0.75rem;
            --font-sm: 0.875rem;
            --font-base: 1rem;
            --font-md: 1.0625rem;
            --font-lg: 1.125rem;
            --font-xl: 1.25rem;
            --font-2xl: 1.5rem;
            --font-3xl: 1.875rem;
            --font-4xl: 2.25rem;
            --font-5xl: 3rem;
            --font-6xl: 3.75rem;
            --spacing-xs: 0.5rem;
            --spacing-sm: 0.75rem;
            --spacing: 1rem;
            --spacing-md: 1.5rem;
            --spacing-lg: 2rem;
            --spacing-xl: 2.5rem;
            --spacing-2xl: 3rem;
            --spacing-3xl: 3.5rem;
            --spacing-4xl: 5rem;
            --spacing-5xl: 6rem;
            --nav-height: 64px;
        }

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

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', 'Helvetica Neue', Arial, sans-serif;
            font-size: var(--font-base);
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
            overflow-x: hidden;
            min-height: 100vh;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--primary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        input,
        button,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
        }

        /* Container */
        .container-custom {
            width: 100%;
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.25rem;
            padding-right: 1.25rem;
        }
        @media (min-width: 768px) {
            .container-custom {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }
        }
        @media (min-width: 1024px) {
            .container-custom {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        /* ========== Navigation - 悬浮胶囊导航 ========== */
        .nav-wrapper {
            position: fixed;
            top: 16px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 1050;
            width: calc(100% - 32px);
            max-width: 1100px;
            transition: all var(--transition);
        }
        .nav-wrapper.scrolled {
            top: 8px;
        }
        .nav-capsule {
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.7);
            border-radius: var(--radius-full);
            padding: 0.5rem 0.75rem 0.5rem 1.35rem;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.07), 0 1px 3px rgba(0, 0, 0, 0.04);
            transition: all var(--transition);
            min-height: var(--nav-height);
        }
        .nav-capsule:hover {
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1), 0 2px 6px rgba(0, 0, 0, 0.05);
        }
        .nav-brand {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-weight: 700;
            font-size: var(--font-lg);
            color: var(--text);
            white-space: nowrap;
            letter-spacing: -0.01em;
            transition: color var(--transition-fast);
        }
        .nav-brand:hover {
            color: var(--primary);
        }
        .nav-brand-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 1.1rem;
            flex-shrink: 0;
            transition: background var(--transition-fast), transform var(--transition-fast);
        }
        .nav-brand:hover .nav-brand-icon {
            background: var(--primary-dark);
            transform: scale(1.05);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links li a {
            display: inline-flex;
            align-items: center;
            padding: 0.55rem 1.1rem;
            border-radius: var(--radius-full);
            font-weight: 500;
            font-size: var(--font-sm);
            color: var(--text-light);
            transition: all var(--transition-fast);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .nav-links li a:hover,
        .nav-links li a.active {
            color: var(--primary);
            background: var(--primary-lighter);
        }
        .nav-links li a.active {
            font-weight: 600;
        }
        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.55rem 1.3rem;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: var(--font-sm);
            background: var(--primary);
            color: #fff;
            border: none;
            transition: all var(--transition-fast);
            white-space: nowrap;
            letter-spacing: 0.01em;
        }
        .nav-cta-btn:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: 0 4px 14px rgba(26, 86, 219, 0.35);
            transform: translateY(-1px);
        }
        .nav-cta-btn:active {
            transform: translateY(0);
            box-shadow: 0 2px 6px rgba(26, 86, 219, 0.3);
        }
        .nav-toggler {
            display: none;
            background: none;
            border: none;
            color: var(--text);
            font-size: 1.5rem;
            padding: 0.4rem;
            border-radius: 50%;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            transition: background var(--transition-fast);
        }
        .nav-toggler:hover {
            background: var(--border-light);
        }
        @media (max-width: 768px) {
            .nav-wrapper {
                top: 10px;
                width: calc(100% - 20px);
            }
            .nav-capsule {
                border-radius: var(--radius-2xl);
                padding: 0.4rem 0.65rem 0.4rem 1rem;
                min-height: 54px;
            }
            .nav-brand {
                font-size: var(--font-base);
                gap: 0.4rem;
            }
            .nav-brand-icon {
                width: 32px;
                height: 32px;
                font-size: 0.95rem;
            }
            .nav-toggler {
                display: flex;
                width: 36px;
                height: 36px;
                font-size: 1.3rem;
            }
            .nav-links-desktop {
                display: none;
            }
            .nav-mobile-menu {
                display: none;
                position: absolute;
                top: calc(100% + 10px);
                left: 0;
                right: 0;
                background: #fff;
                border-radius: var(--radius-lg);
                box-shadow: var(--shadow-lg);
                padding: 0.75rem;
                flex-direction: column;
                gap: 0.25rem;
                border: 1px solid var(--border);
            }
            .nav-mobile-menu.open {
                display: flex;
            }
            .nav-mobile-menu a {
                display: block;
                padding: 0.7rem 1rem;
                border-radius: var(--radius);
                font-weight: 500;
                font-size: var(--font-sm);
                color: var(--text-light);
                transition: all var(--transition-fast);
            }
            .nav-mobile-menu a:hover,
            .nav-mobile-menu a.active {
                color: var(--primary);
                background: var(--primary-lighter);
            }
            .nav-mobile-cta {
                margin-top: 0.25rem;
                display: block;
                text-align: center;
                padding: 0.7rem 1rem;
                border-radius: var(--radius);
                font-weight: 600;
                font-size: var(--font-sm);
                background: var(--primary);
                color: #fff;
                transition: all var(--transition-fast);
            }
            .nav-mobile-cta:hover {
                background: var(--primary-dark);
                color: #fff;
            }
        }
        @media (min-width: 769px) {
            .nav-mobile-menu {
                display: none !important;
            }
        }

        /* ========== Hero ========== */
        .hero-section {
            position: relative;
            padding-top: calc(var(--nav-height) + 4rem);
            padding-bottom: 4rem;
            background: linear-gradient(180deg, #ffffff 0%, #f8fafc 40%, #f1f5f9 100%);
            overflow: hidden;
            min-height: 85vh;
            display: flex;
            align-items: center;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            top: -180px;
            right: -120px;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(26, 86, 219, 0.06) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            bottom: -100px;
            left: -80px;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.05) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 3rem;
            align-items: center;
        }
        .hero-text {
            max-width: 580px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            background: var(--primary-lighter);
            color: var(--primary);
            font-weight: 600;
            font-size: var(--font-xs);
            padding: 0.4rem 0.9rem;
            border-radius: var(--radius-full);
            margin-bottom: 1.25rem;
            letter-spacing: 0.02em;
            border: 1px solid rgba(26, 86, 219, 0.12);
        }
        .hero-badge-dot {
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background: var(--primary);
            animation: pulse-dot 2s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                box-shadow: 0 0 0 0 rgba(26, 86, 219, 0.4);
            }
            50% {
                opacity: 0.7;
                box-shadow: 0 0 0 8px rgba(26, 86, 219, 0);
            }
        }
        .hero-title {
            font-size: var(--font-6xl);
            font-weight: 800;
            line-height: 1.12;
            color: var(--text);
            margin-bottom: 1.25rem;
            letter-spacing: -0.02em;
        }
        .hero-title .highlight {
            color: var(--primary);
            position: relative;
        }
        .hero-title .highlight::after {
            content: '';
            position: absolute;
            bottom: 4px;
            left: 0;
            right: 0;
            height: 8px;
            background: rgba(26, 86, 219, 0.12);
            border-radius: 4px;
            z-index: -1;
        }
        .hero-subtitle {
            font-size: var(--font-lg);
            color: var(--text-light);
            line-height: 1.7;
            margin-bottom: 2rem;
            max-width: 480px;
        }
        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 0.85rem;
            align-items: center;
        }
        .btn-hero-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.85rem 2rem;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: var(--font-base);
            background: var(--primary);
            color: #fff;
            border: none;
            transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(26, 86, 219, 0.3);
        }
        .btn-hero-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: 0 8px 28px rgba(26, 86, 219, 0.4);
            transform: translateY(-2px);
        }
        .btn-hero-primary:active {
            transform: translateY(0);
            box-shadow: 0 4px 12px rgba(26, 86, 219, 0.3);
        }
        .btn-hero-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.85rem 2rem;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: var(--font-base);
            background: transparent;
            color: var(--text);
            border: 2px solid var(--border);
            transition: all var(--transition);
        }
        .btn-hero-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-lighter);
            transform: translateY(-2px);
        }
        .btn-hero-outline:active {
            transform: translateY(0);
        }
        .hero-visual {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .hero-card-stack {
            position: relative;
            width: 100%;
            max-width: 440px;
        }
        .hero-main-card {
            background: #fff;
            border-radius: var(--radius-xl);
            padding: 2rem;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border);
            position: relative;
            z-index: 3;
            text-align: center;
        }
        .hero-main-card-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--primary-lighter);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            margin: 0 auto 1rem;
        }
        .hero-main-card h4 {
            font-weight: 700;
            font-size: var(--font-xl);
            margin-bottom: 0.4rem;
            color: var(--text);
        }
        .hero-main-card p {
            color: var(--text-light);
            font-size: var(--font-sm);
            margin: 0;
        }
        .hero-float-card {
            position: absolute;
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 0.9rem 1.2rem;
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border);
            z-index: 2;
            display: flex;
            align-items: center;
            gap: 0.6rem;
            font-weight: 600;
            font-size: var(--font-sm);
            color: var(--text);
        }
        .hero-float-card.top-right {
            top: -12px;
            right: -10px;
            z-index: 4;
        }
        .hero-float-card.bottom-left {
            bottom: -16px;
            left: -14px;
            z-index: 4;
        }
        .hero-float-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            flex-shrink: 0;
        }
        .hero-float-dot.green {
            background: #22c55e;
            box-shadow: 0 0 8px rgba(34, 197, 94, 0.5);
        }
        .hero-float-dot.amber {
            background: #f59e0b;
            box-shadow: 0 0 8px rgba(245, 158, 11, 0.5);
        }
        @media (max-width: 1024px) {
            .hero-section {
                min-height: auto;
                padding-top: calc(var(--nav-height) + 3rem);
                padding-bottom: 3rem;
            }
            .hero-content {
                grid-template-columns: 1fr;
                gap: 2.5rem;
                text-align: center;
            }
            .hero-text {
                max-width: 100%;
            }
            .hero-subtitle {
                max-width: 100%;
                margin-left: auto;
                margin-right: auto;
            }
            .hero-buttons {
                justify-content: center;
            }
            .hero-title {
                font-size: var(--font-4xl);
            }
            .hero-card-stack {
                max-width: 360px;
                margin: 0 auto;
            }
        }
        @media (max-width: 768px) {
            .hero-section {
                padding-top: calc(var(--nav-height) + 2.5rem);
                padding-bottom: 2.5rem;
            }
            .hero-title {
                font-size: var(--font-3xl);
            }
            .hero-subtitle {
                font-size: var(--font-base);
            }
            .hero-card-stack {
                max-width: 300px;
            }
            .hero-main-card {
                padding: 1.5rem;
            }
            .hero-float-card.top-right {
                top: -8px;
                right: -4px;
                font-size: var(--font-xs);
                padding: 0.6rem 0.8rem;
            }
            .hero-float-card.bottom-left {
                bottom: -10px;
                left: -6px;
                font-size: var(--font-xs);
                padding: 0.6rem 0.8rem;
            }
        }

        /* ========== Section共通 ========== */
        .section-padding {
            padding: var(--spacing-5xl) 0;
        }
        @media (max-width: 768px) {
            .section-padding {
                padding: var(--spacing-3xl) 0;
            }
        }
        .section-header {
            text-align: center;
            margin-bottom: 3rem;
        }
        .section-label {
            display: inline-block;
            font-weight: 600;
            font-size: var(--font-xs);
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: var(--primary);
            background: var(--primary-lighter);
            padding: 0.35rem 0.85rem;
            border-radius: var(--radius-full);
            margin-bottom: 0.85rem;
        }
        .section-title {
            font-size: var(--font-4xl);
            font-weight: 700;
            color: var(--text);
            margin-bottom: 0.75rem;
            letter-spacing: -0.01em;
        }
        .section-desc {
            font-size: var(--font-lg);
            color: var(--text-light);
            max-width: 600px;
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: var(--font-2xl);
            }
            .section-desc {
                font-size: var(--font-base);
            }
        }

        /* ========== 服务亮点卡片 ========== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .feature-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 2rem 1.75rem;
            border: 1px solid var(--border);
            transition: all var(--transition);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: var(--primary);
            opacity: 0;
            transition: opacity var(--transition);
            border-radius: 0 0 var(--radius-xs) var(--radius-xs);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
            border-color: transparent;
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius);
            background: var(--primary-lighter);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin: 0 auto 1.2rem;
            transition: all var(--transition);
        }
        .feature-card:hover .feature-icon {
            background: var(--primary);
            color: #fff;
            transform: scale(1.08);
        }
        .feature-card h4 {
            font-weight: 700;
            font-size: var(--font-lg);
            margin-bottom: 0.6rem;
            color: var(--text);
        }
        .feature-card p {
            color: var(--text-light);
            font-size: var(--font-sm);
            margin: 0;
            line-height: 1.65;
        }
        @media (max-width: 1024px) {
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.25rem;
            }
        }
        @media (max-width: 640px) {
            .features-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
            .feature-card {
                padding: 1.5rem 1.25rem;
            }
        }

        /* ========== 直播资讯卡片列表 ========== */
        .info-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .info-card {
            background: #fff;
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }
        .info-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: transparent;
        }
        .info-card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            background: linear-gradient(135deg, #dbeafe 0%, #eff6ff 50%, #f8fafc 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.5rem;
            color: var(--primary);
        }
        .info-card-body {
            padding: 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .info-card-tag {
            display: inline-block;
            font-size: var(--font-xs);
            font-weight: 600;
            color: var(--primary);
            background: var(--primary-lighter);
            padding: 0.25rem 0.65rem;
            border-radius: var(--radius-full);
            margin-bottom: 0.75rem;
            align-self: flex-start;
        }
        .info-card h4 {
            font-weight: 700;
            font-size: var(--font-base);
            margin-bottom: 0.5rem;
            color: var(--text);
            line-height: 1.45;
        }
        .info-card p {
            color: var(--text-light);
            font-size: var(--font-sm);
            margin: 0 0 1rem;
            flex: 1;
            line-height: 1.6;
        }
        .info-card-link {
            font-weight: 600;
            font-size: var(--font-sm);
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            transition: gap var(--transition-fast);
        }
        .info-card-link:hover {
            gap: 0.55rem;
            color: var(--primary-dark);
        }
        @media (max-width: 1024px) {
            .info-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.25rem;
            }
        }
        @media (max-width: 640px) {
            .info-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
            .info-card-img {
                height: 150px;
            }
        }

        /* ========== 数据统计深色区块 ========== */
        .stats-section {
            background: var(--bg-dark);
            color: var(--text-white);
            padding: var(--spacing-4xl) 0;
            position: relative;
            overflow: hidden;
        }
        .stats-section::before {
            content: '';
            position: absolute;
            top: -100px;
            right: -80px;
            width: 350px;
            height: 350px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(26, 86, 219, 0.2) 0%, transparent 70%);
            pointer-events: none;
        }
        .stats-section::after {
            content: '';
            position: absolute;
            bottom: -80px;
            left: -60px;
            width: 280px;
            height: 280px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.15) 0%, transparent 70%);
            pointer-events: none;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
            text-align: center;
            position: relative;
            z-index: 2;
        }
        .stat-item .stat-number {
            font-size: var(--font-5xl);
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.02em;
            line-height: 1;
            margin-bottom: 0.4rem;
        }
        .stat-item .stat-number span {
            color: var(--accent);
        }
        .stat-item .stat-label {
            font-size: var(--font-sm);
            color: var(--text-white-muted);
            font-weight: 500;
        }
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 2rem 1.5rem;
            }
            .stat-item .stat-number {
                font-size: var(--font-4xl);
            }
        }
        @media (max-width: 640px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.5rem 1rem;
            }
            .stat-item .stat-number {
                font-size: var(--font-3xl);
            }
        }

        /* ========== 观看流程 ========== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }
        .step-card {
            text-align: center;
            position: relative;
        }
        .step-number {
            width: 52px;
            height: 52px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: var(--font-xl);
            margin: 0 auto 1rem;
            position: relative;
            z-index: 2;
            box-shadow: 0 4px 14px rgba(26, 86, 219, 0.3);
        }
        .step-card h4 {
            font-weight: 700;
            font-size: var(--font-base);
            margin-bottom: 0.4rem;
            color: var(--text);
        }
        .step-card p {
            color: var(--text-light);
            font-size: var(--font-sm);
            margin: 0;
            line-height: 1.6;
        }
        .step-connector {
            display: none;
        }
        @media (min-width: 769px) {
            .step-connector {
                display: block;
                position: absolute;
                top: 26px;
                left: calc(50% + 30px);
                width: calc(100% - 60px);
                height: 2px;
                background: var(--border);
                z-index: 1;
            }
            .step-card:last-child .step-connector {
                display: none;
            }
        }
        @media (max-width: 768px) {
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 1.5rem 1rem;
            }
        }
        @media (max-width: 520px) {
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 1.25rem;
            }
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.85rem;
        }
        .faq-item {
            background: #fff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1.2rem 1.5rem;
            background: none;
            border: none;
            font-weight: 600;
            font-size: var(--font-base);
            color: var(--text);
            text-align: left;
            cursor: pointer;
            gap: 1rem;
            transition: color var(--transition-fast);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            font-size: 0.85rem;
            color: var(--text-lighter);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
        }
        .faq-answer-inner {
            padding: 0 1.5rem 1.2rem;
            color: var(--text-light);
            font-size: var(--font-sm);
            line-height: 1.7;
        }
        @media (max-width: 640px) {
            .faq-question {
                padding: 1rem 1.2rem;
                font-size: var(--font-sm);
            }
            .faq-answer-inner {
                padding: 0 1.2rem 1rem;
            }
        }

        /* ========== CTA ========== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: #fff;
            text-align: center;
            padding: var(--spacing-4xl) 0;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: -150px;
            right: -100px;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            pointer-events: none;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            bottom: -120px;
            left: -80px;
            width: 350px;
            height: 350px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.03);
            pointer-events: none;
        }
        .cta-content {
            position: relative;
            z-index: 2;
        }
        .cta-title {
            font-size: var(--font-4xl);
            font-weight: 700;
            margin-bottom: 1rem;
            letter-spacing: -0.01em;
        }
        .cta-desc {
            font-size: var(--font-lg);
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 2rem;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-cta-white {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.9rem 2.2rem;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: var(--font-base);
            background: #fff;
            color: var(--primary);
            border: none;
            transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
        }
        .btn-cta-white:hover {
            background: #f8fafc;
            color: var(--primary-dark);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.2);
            transform: translateY(-2px);
        }
        .btn-cta-white:active {
            transform: translateY(0);
        }
        @media (max-width: 768px) {
            .cta-title {
                font-size: var(--font-2xl);
            }
            .cta-desc {
                font-size: var(--font-base);
            }
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--bg-dark);
            color: var(--text-white-muted);
            padding: var(--spacing-3xl) 0 var(--spacing-lg);
            font-size: var(--font-sm);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 2.5rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            margin-bottom: 1.5rem;
        }
        .footer-brand {
            font-weight: 700;
            font-size: var(--font-lg);
            color: #fff;
            margin-bottom: 0.75rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .footer-brand-desc {
            color: var(--text-white-muted);
            font-size: var(--font-sm);
            line-height: 1.7;
            max-width: 300px;
        }
        .footer-col h5 {
            font-weight: 600;
            font-size: var(--font-sm);
            color: #fff;
            margin-bottom: 1rem;
            letter-spacing: 0.02em;
        }
        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .footer-links a {
            color: var(--text-white-muted);
            font-size: var(--font-sm);
            transition: color var(--transition-fast);
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-bottom {
            text-align: center;
            color: rgba(255, 255, 255, 0.4);
            font-size: var(--font-xs);
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .footer-brand-desc {
                max-width: 100%;
            }
        }

        /* ========== 通用按钮 reset 覆盖 Bootstrap ========== */
        .btn {
            border-radius: var(--radius-full) !important;
            font-weight: 600;
            transition: all var(--transition) !important;
        }
        .btn-primary {
            background-color: var(--primary) !important;
            border-color: var(--primary) !important;
            box-shadow: 0 4px 14px rgba(26, 86, 219, 0.25);
        }
        .btn-primary:hover {
            background-color: var(--primary-dark) !important;
            border-color: var(--primary-dark) !important;
            box-shadow: 0 6px 20px rgba(26, 86, 219, 0.35);
            transform: translateY(-1px);
        }
        .btn-primary:active {
            transform: translateY(0) !important;
        }

        /* ========== 覆盖 Bootstrap 默认 ========== */
        .bg-light {
            background-color: var(--bg) !important;
        }
        .text-muted {
            color: var(--text-light) !important;
        }

        /* ========== 可访问性 focus ========== */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 3px;
            border-radius: 2px;
        }
        .nav-capsule a:focus-visible,
        .nav-capsule button:focus-visible {
            outline-offset: 2px;
            border-radius: var(--radius-full);
        }
        .btn-hero-primary:focus-visible,
        .btn-hero-outline:focus-visible,
        .btn-cta-white:focus-visible {
            outline-offset: 4px;
            border-radius: var(--radius-full);
        }

        /* ========== 平滑滚动偏移（固定导航补偿） ========== */
        html {
            scroll-padding-top: calc(var(--nav-height) + 30px);
        }