/* roulang page: index */
:root {
            --primary-orange: #FF6B35;
            --primary-dark: #E55A2B;
            --accent-glow: #C8FF00;
            --deep-charcoal: #2D2D2D;
            --asphalt-black: #1A1A1A;
            --light-bg: #F5F5F5;
            --card-white: #FFFFFF;
            --card-light: #FAFAFA;
            --text-dark: #1A1A1A;
            --text-body: #333333;
            --text-muted: #666666;
            --text-light: #DDDDDD;
            --footer-bg: #111111;
            --footer-text: #999999;
            --border-light: #E5E5E5;
            --border-dark: #3A3A3A;
            --radius-lg: 16px;
            --radius-md: 8px;
            --radius-round: 50%;
            --shadow-default: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
            --gap-section: 120px;
            --max-width: 1200px;
            --font-heading: 'PingFang SC', 'Microsoft YaHei', '苹方', '思源黑体', sans-serif;
            --font-mono: 'SF Mono', 'Menlo', 'Consolas', monospace;
        }

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

        body {
            font-family: var(--font-heading);
            background-color: #fff;
            color: var(--text-body);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s;
        }

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

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

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

        /* 分屏 Hero 联动导航 */
        .hero-wrapper {
            display: flex;
            height: 100vh;
            min-height: 700px;
            max-height: 900px;
            background-color: var(--asphalt-black);
        }

        .nav-panel {
            width: 35%;
            background-color: var(--deep-charcoal);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            padding: 40px 32px;
            position: relative;
            z-index: 10;
        }

        .logo-area {
            margin-bottom: 48px;
        }

        .logo-text {
            font-size: 32px;
            font-weight: 900;
            color: #fff;
            letter-spacing: -0.5px;
            line-height: 1.2;
        }

        .logo-text span {
            color: var(--primary-orange);
        }

        .nav-links {
            display: flex;
            flex-direction: column;
            gap: 20px;
            list-style: none;
        }

        .nav-links li a {
            display: block;
            color: #ccc;
            font-size: 18px;
            font-weight: 500;
            padding: 8px 0;
            position: relative;
            transition: color 0.2s;
            letter-spacing: 0.5px;
        }

        .nav-links li a:hover {
            color: #fff;
        }

        .nav-links li a::before {
            content: '';
            position: absolute;
            left: -16px;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 0;
            background-color: var(--primary-orange);
            transition: height 0.2s ease;
        }

        .nav-links li a:hover::before {
            height: 24px;
        }

        .nav-footer {
            margin-top: auto;
            color: #888;
            font-size: 14px;
        }

        .hero-visual {
            width: 65%;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center 30%;
            position: relative;
            display: flex;
            align-items: flex-end;
            padding: 60px;
        }

        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(26,26,26,0.85) 0%, rgba(26,26,26,0.3) 70%);
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 600px;
            color: #fff;
        }

        .hero-content h1 {
            font-size: 48px;
            font-weight: 900;
            letter-spacing: -0.5px;
            line-height: 1.2;
            margin-bottom: 16px;
            color: #fff;
        }

        .hero-content h1 span {
            color: var(--primary-orange);
        }

        .hero-subtitle {
            font-size: 18px;
            color: #ddd;
            margin-bottom: 32px;
            max-width: 480px;
        }

        .btn-primary {
            background-color: var(--primary-orange);
            color: #fff;
            font-weight: 700;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            display: inline-block;
            transition: background 0.2s, transform 0.2s;
            border: none;
            cursor: pointer;
            font-size: 16px;
        }

        .btn-primary:hover {
            background-color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .btn-ghost {
            background: transparent;
            border: 1px solid #fff;
            color: #fff;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            transition: 0.2s;
        }

        .btn-ghost:hover {
            background: #fff;
            color: var(--asphalt-black);
        }

        /* 移动端汉堡菜单 */
        .hamburger {
            display: none;
            position: absolute;
            top: 24px;
            right: 24px;
            z-index: 100;
            font-size: 28px;
            color: #fff;
            background: none;
            border: none;
        }

        @media (max-width: 1024px) {
            .hero-wrapper {
                flex-direction: column;
                height: auto;
            }
            .nav-panel {
                width: 100%;
                flex-direction: row;
                align-items: center;
                padding: 20px 24px;
            }
            .nav-links {
                display: none;
            }
            .hero-visual {
                width: 100%;
                height: 70vh;
            }
            .hamburger {
                display: block;
            }
            .mobile-menu {
                display: none;
                position: fixed;
                inset: 0;
                background: var(--deep-charcoal);
                z-index: 99;
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: 32px;
            }
            .mobile-menu.active {
                display: flex;
            }
        }

        /* 通用区块 */
        section {
            padding: var(--gap-section) 0;
        }

        @media (max-width: 768px) {
            section {
                padding: 60px 0;
            }
            :root {
                --gap-section: 60px;
            }
        }

        h2 {
            font-size: 36px;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 16px;
            color: var(--text-dark);
        }

        .section-subtitle {
            color: var(--text-muted);
            font-size: 18px;
            margin-bottom: 48px;
        }

        /* 数据看板 */
        .stats-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 32px;
            background: var(--light-bg);
            padding: 48px 0;
        }

        .stat-badge {
            background: #fff;
            border-radius: var(--radius-round);
            width: 160px;
            height: 160px;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-default);
            text-align: center;
        }

        .stat-number {
            font-family: var(--font-mono);
            font-size: 32px;
            font-weight: 700;
            color: var(--asphalt-black);
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-muted);
            margin-top: 8px;
        }

        /* 服务矩阵 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }

        .service-card {
            background: var(--card-white);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            box-shadow: var(--shadow-default);
            transition: box-shadow 0.3s, border-bottom 0.2s;
            border-bottom: 3px solid transparent;
            position: relative;
        }

        .service-card:hover {
            box-shadow: var(--shadow-hover);
            border-bottom-color: var(--primary-orange);
        }

        .service-icon {
            font-size: 48px;
            color: var(--primary-orange);
            margin-bottom: 20px;
        }

        .service-card h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .service-card p {
            color: var(--text-muted);
            font-size: 15px;
        }

        @media (max-width: 768px) {
            .services-grid {
                grid-template-columns: 1fr;
            }
        }

        /* 成果对比 */
        .comparison-row {
            display: flex;
            align-items: center;
            gap: 24px;
        }

        .vs-badge {
            background: var(--deep-charcoal);
            color: #fff;
            border-radius: var(--radius-round);
            width: 80px;
            height: 80px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
            font-size: 24px;
            flex-shrink: 0;
        }

        .compare-card {
            flex: 1;
            padding: 32px;
            border-radius: var(--radius-lg);
        }

        .compare-left {
            background: #f0f0f0;
            color: #444;
        }

        .compare-right {
            background: var(--deep-charcoal);
            color: #fff;
        }

        @media (max-width: 768px) {
            .comparison-row {
                flex-direction: column;
            }
        }

        /* FAQ */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }

        .accordion-item {
            border-bottom: 1px solid var(--border-light);
            padding: 16px 0;
        }

        @media (max-width: 768px) {
            .faq-grid {
                grid-template-columns: 1fr;
            }
        }

        /* 表单区 */
        .cta-section {
            background: var(--deep-charcoal);
            padding: 80px 0;
        }

        .form-card {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 48px;
            max-width: 700px;
            margin: 0 auto;
        }

        .footer {
            background: var(--footer-bg);
            color: var(--footer-text);
            padding: 60px 0 30px;
        }

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