/* roulang page: index */
:root {
            --primary: #4F46E5;
            --primary-dark: #4338CA;
            --primary-light: #EEF2FF;
            --accent: #F59E0B;
            --accent-soft: #FEF3C7;
            --bg: #F8FAFC;
            --surface: #FFFFFF;
            --text: #1E293B;
            --text-secondary: #475569;
            --text-muted: #94A3B8;
            --border: #E2E8F0;
            --border-light: #F1F5F9;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 20px;
            --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
            --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.04);
            --shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.10), 0 4px 8px rgba(15, 23, 42, 0.06);
            --shadow-xl: 0 20px 48px rgba(15, 23, 42, 0.14), 0 8px 16px rgba(15, 23, 42, 0.08);
            --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            --max-width: 1200px;
            --nav-height: 72px;
            --section-spacing: 88px;
            --transition: 0.22s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-base);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background-color: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

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

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

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

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

        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }

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

        /* ============ 导航 ============ */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            height: var(--nav-height);
            display: flex;
            align-items: center;
            transition: box-shadow var(--transition);
        }

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

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }

        .logo {
            font-size: 1.35rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 10px;
            transition: color var(--transition);
        }

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

        .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--primary) 0%, #7C3AED 100%);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.1rem;
            font-weight: 700;
            flex-shrink: 0;
        }

        .main-nav {
            display: flex;
            align-items: center;
            list-style: none;
            gap: 8px;
        }

        .main-nav a {
            display: inline-block;
            padding: 8px 18px;
            border-radius: 999px;
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-secondary);
            transition: all var(--transition);
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

        .main-nav a.active {
            color: #fff;
            background: var(--primary);
            box-shadow: 0 2px 8px rgba(79, 70, 229, 0.3);
        }

        .nav-toggle {
            display: none;
            width: 44px;
            height: 44px;
            border: none;
            background: transparent;
            cursor: pointer;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 5px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }

        .nav-toggle:hover {
            background: var(--primary-light);
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--text);
            border-radius: 2px;
            transition: all var(--transition);
        }

        .nav-toggle.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }

        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        /* ============ Hero ============ */
        .hero {
            background: linear-gradient(180deg, #EEF2FF 0%, #F8FAFC 100%);
            padding: 80px 0 72px;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: "";
            position: absolute;
            top: -180px;
            right: -120px;
            width: 520px;
            height: 520px;
            background: radial-gradient(circle, rgba(79, 70, 229, 0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero::after {
            content: "";
            position: absolute;
            bottom: -220px;
            left: -140px;
            width: 480px;
            height: 480px;
            background: radial-gradient(circle, rgba(245, 158, 11, 0.10) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero .container {
            position: relative;
            z-index: 1;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 999px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 24px;
            box-shadow: var(--shadow-sm);
        }

        .hero-tag .dot {
            width: 7px;
            height: 7px;
            background: var(--accent);
            border-radius: 50%;
            animation: pulse-dot 2s infinite;
        }

        @keyframes pulse-dot {
            0%, 100% { opacity: 1; transform: scale(1); }
            50% { opacity: 0.55; transform: scale(0.8); }
        }

        .hero h1 {
            font-size: clamp(2rem, 4vw, 3.2rem);
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -1px;
            color: var(--text);
            margin-bottom: 20px;
            max-width: 850px;
        }

        .hero h1 .highlight {
            color: var(--primary);
            position: relative;
            white-space: nowrap;
        }

        .hero h1 .highlight::after {
            content: "";
            position: absolute;
            bottom: 4px;
            left: 0;
            right: 0;
            height: 8px;
            background: rgba(245, 158, 11, 0.35);
            border-radius: 4px;
            z-index: -1;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            line-height: 1.75;
            color: var(--text-secondary);
            max-width: 680px;
            margin-bottom: 32px;
        }

        .hero-cta {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            align-items: center;
            margin-bottom: 40px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 28px;
            border-radius: 12px;
            font-size: 1rem;
            font-weight: 700;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-align: center;
            justify-content: center;
            line-height: 1.4;
        }

        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(79, 70, 229, 0.32);
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            box-shadow: 0 6px 20px rgba(79, 70, 229, 0.42);
            transform: translateY(-2px);
        }

        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(79, 70, 229, 0.28);
        }

        .btn-secondary {
            background: #fff;
            color: var(--text);
            border: 1.5px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .btn-secondary:hover {
            border-color: var(--primary);
            color: var(--primary);
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            padding-top: 32px;
            border-top: 1px solid var(--border);
        }

        .hero-stat {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .hero-stat .stat-number {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.5px;
        }

        .hero-stat .stat-label {
            font-size: 0.9rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* ============ 板块通用 ============ */
        .section {
            padding: var(--section-spacing) 0;
        }

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

        .section-tag {
            display: inline-block;
            padding: 5px 14px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.82rem;
            font-weight: 700;
            border-radius: 999px;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }

        .section-title {
            font-size: clamp(1.5rem, 2.5vw, 2.2rem);
            font-weight: 800;
            letter-spacing: -0.5px;
            line-height: 1.3;
            color: var(--text);
            margin-bottom: 14px;
        }

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

        /* ============ 核心卖点 ============ */
        .features {
            background: var(--surface);
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .feature-card {
            background: var(--bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), #7C3AED);
            opacity: 0;
            transition: opacity var(--transition);
        }

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

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

        .feature-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin-bottom: 20px;
            font-weight: 700;
            background: var(--primary-light);
            color: var(--primary);
        }

        .feature-card:nth-child(2) .feature-icon {
            background: var(--accent-soft);
            color: var(--accent);
        }

        .feature-card:nth-child(3) .feature-icon {
            background: #FCE7F3;
            color: #DB2777;
        }

        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text);
        }

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

        /* ============ 内容资讯列表 ============ */
        .content-section {
            background: var(--bg);
        }

        .content-list {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }

        .content-card {
            background: var(--surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 24px 26px;
            display: flex;
            gap: 18px;
            align-items: flex-start;
            transition: all var(--transition);
            cursor: default;
        }

        .content-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: var(--primary-light);
        }

        .content-index {
            flex-shrink: 0;
            width: 42px;
            height: 42px;
            border-radius: 12px;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 800;
            font-size: 1.05rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .content-card:nth-child(even) .content-index {
            background: var(--accent-soft);
            color: var(--accent);
        }

        .content-info h3 {
            font-size: 1.08rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
        }

        .content-info p {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        .content-meta {
            display: flex;
            gap: 12px;
            margin-top: 12px;
            flex-wrap: wrap;
        }

        .content-meta span {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        /* ============ 数据板块 ============ */
        .stats-section {
            background: linear-gradient(135deg, var(--primary) 0%, #6D28D9 100%);
            padding: 72px 0;
            position: relative;
            overflow: hidden;
        }

        .stats-section::before {
            content: "";
            position: absolute;
            top: -100px;
            right: -80px;
            width: 360px;
            height: 360px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: 50%;
        }

        .stats-section::after {
            content: "";
            position: absolute;
            bottom: -140px;
            left: -60px;
            width: 300px;
            height: 300px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: 50%;
        }

        .stats-section .container {
            position: relative;
            z-index: 1;
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 36px;
            text-align: center;
        }

        .stat-item .stat-value {
            font-size: clamp(2.2rem, 3vw, 3rem);
            font-weight: 800;
            color: #fff;
            letter-spacing: -1px;
            line-height: 1.2;
            margin-bottom: 6px;
        }

        .stat-item .stat-name {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.78);
            font-weight: 500;
        }

        /* ============ 操作步骤 ============ */
        .steps-section {
            background: var(--surface);
        }

        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 22px;
            counter-reset: step;
        }

        .step-item {
            background: var(--bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            text-align: center;
            transition: all var(--transition);
            position: relative;
        }

        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
            border-color: var(--primary-light);
        }

        .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 1.2rem;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 4px 12px rgba(79, 70, 229, 0.28);
        }

        .step-item h3 {
            font-size: 1.08rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }

        .step-item p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.65;
        }

        /* ============ FAQ ============ */
        .faq-section {
            background: var(--bg);
        }

        .faq-list {
            max-width: 820px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .faq-item {
            background: var(--surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            border-color: var(--primary-light);
            box-shadow: var(--shadow-sm);
        }

        .faq-question {
            width: 100%;
            padding: 20px 26px;
            background: transparent;
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            font-size: 1.02rem;
            font-weight: 700;
            color: var(--text);
            text-align: left;
            transition: color var(--transition);
            line-height: 1.5;
        }

        .faq-question:hover {
            color: var(--primary);
        }

        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: var(--primary-light);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
            transition: all var(--transition);
        }

        .faq-item.open .faq-icon {
            background: var(--primary);
            color: #fff;
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .faq-answer-inner {
            padding: 0 26px 22px;
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.75;
        }

        .faq-item.open .faq-answer {
            max-height: 400px;
        }

        /* ============ CTA ============ */
        .cta-section {
            background: var(--surface);
            padding: 72px 0;
        }

        .cta-box {
            background: linear-gradient(135deg, var(--primary) 0%, #6D28D9 100%);
            border-radius: var(--radius-xl);
            padding: 56px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-xl);
        }

        .cta-box::before {
            content: "";
            position: absolute;
            top: -80px;
            left: -60px;
            width: 280px;
            height: 280px;
            background: rgba(255, 255, 255, 0.07);
            border-radius: 50%;
        }

        .cta-box::after {
            content: "";
            position: absolute;
            bottom: -100px;
            right: -50px;
            width: 320px;
            height: 320px;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 50%;
        }

        .cta-box h2 {
            font-size: clamp(1.6rem, 2.5vw, 2.2rem);
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.5px;
            margin-bottom: 14px;
            position: relative;
            z-index: 1;
        }

        .cta-box p {
            font-size: 1.08rem;
            color: rgba(255, 255, 255, 0.82);
            max-width: 560px;
            margin: 0 auto 28px;
            line-height: 1.7;
            position: relative;
            z-index: 1;
        }

        .cta-box .btn-cta {
            background: #fff;
            color: var(--primary);
            font-weight: 800;
            padding: 15px 34px;
            border-radius: 12px;
            border: none;
            cursor: pointer;
            font-size: 1.02rem;
            transition: all var(--transition);
            position: relative;
            z-index: 1;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
        }

        .cta-box .btn-cta:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 28px rgba(0, 0, 0, 0.24);
            background: #F8FAFC;
        }

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

        /* ============ 页脚 ============ */
        .site-footer {
            background: #0F172A;
            color: rgba(255, 255, 255, 0.72);
            padding: 56px 0 0;
        }

        .site-footer .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
        }

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

        .footer-brand .logo:hover {
            color: #fff;
        }

        .footer-brand p {
            font-size: 0.92rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.55);
            max-width: 340px;
        }

        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-col a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.92rem;
            transition: color var(--transition);
        }

        .footer-col a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.42);
        }

        /* ============ 响应式 ============ */
        @media (max-width: 1024px) {
            :root {
                --section-spacing: 64px;
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .site-footer .container {
                grid-template-columns: 1fr 1fr;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }

        @media (max-width: 768px) {
            :root {
                --nav-height: 64px;
                --section-spacing: 52px;
            }
            .container {
                padding: 0 18px;
            }
            .main-nav {
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: #fff;
                border-bottom: 1px solid var(--border);
                flex-direction: column;
                padding: 14px 18px 20px;
                gap: 6px;
                box-shadow: var(--shadow-md);
                display: none;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                width: 100%;
                text-align: center;
                padding: 12px 16px;
            }
            .nav-toggle {
                display: flex;
            }
            .hero {
                padding: 56px 0 48px;
            }
            .hero-cta {
                flex-direction: column;
                align-items: stretch;
            }
            .btn {
                width: 100%;
                justify-content: center;
            }
            .hero-stats {
                gap: 20px;
            }
            .hero-stat .stat-number {
                font-size: 1.5rem;
            }
            .content-list {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .features-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .cta-box {
                padding: 40px 24px;
            }
            .site-footer .container {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-brand {
                grid-column: auto;
            }
            .section-header {
                margin-bottom: 32px;
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 1.7rem;
                letter-spacing: -0.5px;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .hero-stats {
                flex-direction: column;
                gap: 14px;
            }
            .section-title {
                font-size: 1.45rem;
            }
            .faq-question {
                font-size: 0.95rem;
                padding: 16px 18px;
            }
            .faq-answer-inner {
                padding: 0 18px 16px;
                font-size: 0.9rem;
            }
            .content-card {
                flex-direction: column;
                gap: 12px;
                padding: 20px;
            }
            .feature-card {
                padding: 24px 20px;
            }
        }