/* roulang page: index */
:root {
            --primary: #E94E1B;
            --primary-dark: #C63D0E;
            --secondary: #1B1B2F;
            --warm-white: #F5F0E8;
            --accent: #00C9A7;
            --text-primary: #2D2D2D;
            --text-secondary: #6B6B6B;
            --border: #E0DCD5;
            --card-radius-lg: 12px;
            --card-radius-sm: 8px;
            --shadow-sm: 0 4px 20px rgba(27, 27, 47, 0.06);
            --shadow-hover: 0 8px 30px rgba(233, 78, 27, 0.12);
            --transition: all 0.25s ease;
        }

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

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            background-color: var(--warm-white);
            color: var(--text-primary);
            line-height: 1.7;
            font-weight: 400;
            -webkit-font-smoothing: antialiased;
        }

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

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

        button, .button {
            cursor: pointer;
            border: none;
            outline: none;
            font-family: inherit;
        }

        h1, h2, h3, h4 {
            font-weight: 700;
            letter-spacing: -0.02em;
            line-height: 1.25;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 16px;
        }

        /* 导航栏 - 杂志频道式 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 40;
            width: 100%;
        }

        .brand-row {
            background-color: var(--secondary);
            color: white;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 10px 24px;
            height: 60px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.4rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            color: white;
        }

        .logo-icon {
            width: 36px;
            height: 36px;
            border: 2px solid var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }

        .logo-icon::before {
            content: '';
            width: 12px;
            height: 12px;
            background: var(--primary);
            border-radius: 50%;
            box-shadow: 0 0 8px var(--primary);
        }

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

        .channel-row {
            background-color: var(--warm-white);
            border-bottom: 1px solid var(--border);
            padding: 0 24px;
            display: flex;
            align-items: center;
            overflow-x: auto;
            white-space: nowrap;
            -webkit-overflow-scrolling: touch;
            gap: 0;
        }

        .channel-row a {
            display: inline-block;
            padding: 12px 18px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-primary);
            position: relative;
            transition: var(--transition);
            border-right: 1px solid var(--border);
        }

        .channel-row a:last-child {
            border-right: none;
        }

        .channel-row a:hover {
            color: var(--primary);
        }

        .channel-row a.active {
            color: var(--primary);
            font-weight: 700;
        }

        .channel-row a::after {
            content: '';
            position: absolute;
            bottom: 6px;
            left: 18px;
            right: 18px;
            height: 2px;
            background: var(--primary);
            transform: scaleX(0);
            transition: transform 0.2s ease;
        }

        .channel-row a:hover::after,
        .channel-row a.active::after {
            transform: scaleX(1);
        }

        /* 汉堡菜单 - 移动端 */
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.6rem;
            padding: 8px;
            cursor: pointer;
        }

        @media screen and (max-width: 639px) {
            .channel-row {
                padding: 0 8px;
                gap: 4px;
            }

            .channel-row a {
                padding: 10px 12px;
                font-size: 0.85rem;
                border-right: none;
            }

            .hamburger {
                display: block;
            }

            .brand-row .nav-actions .desktop-only {
                display: none;
            }

            .logo {
                font-size: 1.1rem;
            }
        }

        @media screen and (min-width: 640px) {
            .hamburger {
                display: none;
            }
        }

        /* Hero */
        .hero {
            padding: 60px 0;
            background: linear-gradient(180deg, #ffffff 0%, var(--warm-white) 100%);
        }

        .hero .hero-grid {
            display: flex;
            align-items: center;
            gap: 48px;
        }

        .hero-text {
            flex: 1;
        }

        .hero-text h1 {
            font-size: 3rem;
            font-weight: 800;
            color: var(--secondary);
            margin-bottom: 16px;
            position: relative;
        }

        .hero-text h1 span {
            color: var(--primary);
            position: relative;
        }

        .hero-text .subtitle {
            font-size: 1.2rem;
            color: var(--text-secondary);
            margin-bottom: 32px;
            line-height: 1.6;
        }

        .hero-actions {
            display: flex;
            align-items: center;
            gap: 24px;
            flex-wrap: wrap;
        }

        .btn-primary {
            background: var(--primary);
            color: white;
            padding: 14px 36px;
            border-radius: var(--card-radius-sm);
            font-weight: 700;
            font-size: 1.1rem;
            display: inline-block;
            transition: var(--transition);
            box-shadow: 0 4px 12px rgba(233, 78, 27, 0.3);
            border: none;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: scale(1.03);
            color: white;
        }

        .hero-stats {
            color: var(--text-secondary);
            font-size: 0.95rem;
            font-weight: 500;
        }

        .hero-image {
            flex: 1;
            border-radius: var(--card-radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            background: #ddd;
        }

        .hero-image img {
            width: 100%;
            height: auto;
            display: block;
        }

        @media screen and (max-width: 1024px) {
            .hero .hero-grid {
                flex-direction: column;
                gap: 32px;
            }

            .hero-text h1 {
                font-size: 2.4rem;
            }
        }

        @media screen and (max-width: 639px) {
            .hero-text h1 {
                font-size: 2rem;
            }

            .hero-text .subtitle {
                font-size: 1rem;
            }

            .btn-primary {
                padding: 12px 28px;
                font-size: 1rem;
            }
        }

        /* 通用板块 */
        .section {
            padding: 80px 0;
        }

        .section-title {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--secondary);
            margin-bottom: 16px;
            text-align: left;
        }

        .section-desc {
            color: var(--text-secondary);
            font-size: 1.1rem;
            max-width: 700px;
            margin-bottom: 48px;
        }

        @media screen and (max-width: 639px) {
            .section {
                padding: 60px 0;
            }

            .section-title {
                font-size: 1.8rem;
            }
        }

        /* 核心优势 - 1+2 数字布局 */
        .advantages-list {
            display: flex;
            flex-direction: column;
            gap: 40px;
        }

        .advantage-item {
            display: flex;
            gap: 32px;
            align-items: flex-start;
        }

        .adv-number {
            font-size: 4rem;
            font-weight: 800;
            color: var(--accent);
            line-height: 1;
            width: 100px;
            flex-shrink: 0;
            font-family: 'Courier New', monospace;
        }

        .adv-content h3 {
            font-size: 1.6rem;
            margin-bottom: 8px;
            color: var(--secondary);
        }

        .adv-content p {
            color: var(--text-secondary);
            max-width: 600px;
        }

        @media screen and (max-width: 639px) {
            .advantage-item {
                flex-direction: column;
                gap: 8px;
            }

            .adv-number {
                font-size: 3rem;
                width: auto;
            }
        }

        /* 功能矩阵 */
        .function-grid {
            display: flex;
            flex-direction: column;
            gap: 64px;
        }

        .func-row {
            display: flex;
            align-items: center;
            gap: 48px;
        }

        .func-row.reverse {
            flex-direction: row-reverse;
        }

        .func-text {
            flex: 1;
        }

        .func-text h3 {
            font-size: 1.8rem;
            margin-bottom: 16px;
            color: var(--secondary);
        }

        .func-text p {
            color: var(--text-secondary);
            margin-bottom: 20px;
        }

        .text-link {
            color: var(--primary);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap 0.2s;
        }

        .text-link:hover {
            gap: 12px;
            color: var(--primary-dark);
        }

        .func-image {
            flex: 1;
            border-radius: var(--card-radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            background: #eae3d9;
        }

        @media screen and (max-width: 1024px) {
            .func-row, .func-row.reverse {
                flex-direction: column;
                gap: 24px;
            }
        }

        /* 场景卡片 */
        .scene-grid {
            display: flex;
            gap: 24px;
            overflow-x: auto;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
            padding-bottom: 16px;
        }

        .scene-card {
            flex: 0 0 340px;
            scroll-snap-align: start;
            border-radius: var(--card-radius-lg);
            overflow: hidden;
            position: relative;
            box-shadow: var(--shadow-sm);
            background: #ccc;
            height: 380px;
        }

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

        .scene-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(0deg, rgba(0,0,0,0.7) 0%, transparent 100%);
            color: white;
            padding: 24px;
        }

        .scene-overlay h4 {
            font-size: 1.3rem;
            margin-bottom: 6px;
        }

        @media screen and (max-width: 639px) {
            .scene-card {
                flex: 0 0 280px;
                height: 320px;
            }
        }

        /* 数据墙 */
        .data-wall {
            background: #EAE4DB;
            border-radius: var(--card-radius-lg);
            padding: 48px;
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            justify-content: center;
            text-align: center;
        }

        .data-item .data-number {
            font-size: 3rem;
            font-weight: 700;
            color: var(--accent);
            font-family: 'Courier New', monospace;
        }

        .data-item .data-label {
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* FAQ */
        .accordion-faq .accordion-item {
            border: 1px solid var(--border);
            border-radius: var(--card-radius-sm);
            margin-bottom: 12px;
            background: white;
        }

        .accordion-title {
            font-size: 1.1rem;
            font-weight: 600;
            padding: 18px 24px;
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 12px;
            transition: var(--transition);
        }

        .accordion-title .q-icon {
            color: var(--primary);
            font-weight: 800;
            font-size: 1.3rem;
        }

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

        .accordion-content {
            padding: 0 24px 18px 52px;
            color: var(--text-secondary);
            display: none;
        }

        .accordion-item.active .accordion-content {
            display: block;
        }

        .accordion-item.active .accordion-title {
            color: var(--primary);
        }

        /* CTA 横幅 */
        .cta-banner {
            background: var(--secondary);
            color: white;
            padding: 80px 0;
            text-align: center;
        }

        .cta-banner h2 {
            font-size: 2.5rem;
            margin-bottom: 24px;
        }

        .btn-large {
            background: var(--primary);
            color: white;
            padding: 18px 48px;
            border-radius: var(--card-radius-sm);
            font-size: 1.3rem;
            font-weight: 700;
            display: inline-block;
            transition: var(--transition);
        }

        .btn-large:hover {
            background: var(--primary-dark);
            transform: scale(1.03);
            color: white;
        }

        /* 页脚 */
        .site-footer {
            background: var(--secondary);
            color: #ccc;
            padding: 48px 0 24px;
        }

        .footer-grid {
            display: flex;
            gap: 48px;
            flex-wrap: wrap;
            justify-content: space-between;
        }

        .footer-col h4 {
            color: white;
            margin-bottom: 16px;
        }

        .footer-links a {
            display: block;
            color: #aaa;
            margin-bottom: 8px;
            transition: color 0.2s;
        }

        .footer-links a:hover {
            color: var(--primary);
        }

        .copyright {
            margin-top: 32px;
            text-align: center;
            color: #888;
            font-size: 0.9rem;
        }

        @media screen and (max-width: 639px) {
            .footer-grid {
                flex-direction: column;
            }
        }