/* roulang page: index */
:root {
            --primary-yellow: #FFB800;
            --primary-yellow-hover: #F0A500;
            --primary-yellow-light: rgba(255, 184, 0, 0.08);
            --secondary-teal: #0D9488;
            --secondary-teal-hover: #0B7A6F;
            --secondary-teal-light: rgba(13, 148, 136, 0.06);
            --green-success: #00B578;
            --orange-warning: #FF9F0A;
            --red-error: #FA5151;
            --black-text: #1F2329;
            --gray-aux: #86909C;
            --gray-text: #475467;
            --light-bg: #F5F6FA;
            --white: #FFFFFF;
            --border-light: rgba(0, 0, 0, 0.04);
            --border-input: #E5E7EB;
            --shadow-card: 0 2px 8px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.02);
            --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
            --shadow-nav: 0 2px 16px rgba(0,0,0,0.06);
            --radius-lg: 12px;
            --radius-md: 8px;
            --radius-sm: 4px;
            --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --max-width: 1200px;
            --nav-height: 64px;
        }

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

        body {
            font-family: var(--font-sans);
            background-color: var(--light-bg);
            color: var(--black-text);
            line-height: 1.5;
            font-size: 15px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.15s ease;
        }

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

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

        /* 导航栏 */
        .nav {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--nav-height);
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            z-index: 1000;
            transition: background 0.25s ease, box-shadow 0.25s ease;
            display: flex;
            align-items: center;
        }

        .nav.scrolled {
            background: var(--white);
            box-shadow: var(--shadow-nav);
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        .logo {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            white-space: nowrap;
        }
        .logo .mango {
            color: var(--primary-yellow);
        }
        .logo .sport {
            color: var(--black-text);
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }
        .nav-menu a {
            font-size: 14px;
            font-weight: 500;
            color: var(--gray-text);
            padding: 8px 0;
            position: relative;
            transition: color 0.2s;
        }
        .nav-menu a:hover,
        .nav-menu a.active {
            color: var(--primary-yellow);
        }
        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--primary-yellow);
            border-radius: 1px;
        }

        .btn-capsule {
            background: var(--primary-yellow);
            color: var(--black-text);
            padding: 10px 24px;
            border-radius: 50px;
            font-size: 14px;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: background 0.15s, transform 0.15s;
            border: none;
            cursor: pointer;
        }
        .btn-capsule:hover {
            background: var(--primary-yellow-hover);
            transform: translateY(-1px);
        }

        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--black-text);
            cursor: pointer;
            padding: 4px;
        }

        /* 移动端底部导航 */
        .mobile-bottom-nav {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 56px;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid var(--border-light);
            z-index: 999;
            justify-content: space-around;
            align-items: center;
        }
        .mobile-bottom-nav a {
            display: flex;
            flex-direction: column;
            align-items: center;
            font-size: 12px;
            color: var(--gray-aux);
            gap: 4px;
            transition: color 0.2s;
            font-weight: 500;
        }
        .mobile-bottom-nav a i {
            font-size: 20px;
        }
        .mobile-bottom-nav a.active {
            color: var(--primary-yellow);
        }

        /* 通用板块 */
        section {
            padding: 120px 0;
        }
        .section-title {
            font-size: 28px;
            font-weight: 600;
            line-height: 1.3;
            margin-bottom: 16px;
            color: var(--black-text);
            letter-spacing: 0;
        }
        .section-sub {
            font-size: 16px;
            color: var(--gray-aux);
            margin-bottom: 40px;
            line-height: 1.6;
        }

        /* Hero */
        .hero {
            padding-top: calc(var(--nav-height) + 60px);
            padding-bottom: 80px;
            min-height: 100vh;
            display: flex;
            align-items: center;
            background: var(--white);
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(255,255,255,0.88);
        }
        .hero .container {
            position: relative;
            z-index: 2;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .hero-left h1 {
            font-size: 36px;
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: -0.5px;
            color: var(--black-text);
            margin-bottom: 20px;
        }
        .hero-left .subtitle {
            font-size: 16px;
            color: var(--gray-aux);
            line-height: 1.6;
            margin-bottom: 32px;
        }
        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary {
            background: var(--primary-yellow);
            color: var(--black-text);
            padding: 14px 32px;
            border-radius: var(--radius-md);
            font-weight: 500;
            font-size: 15px;
            letter-spacing: 0.5px;
            border: none;
            cursor: pointer;
            transition: background 0.15s, transform 0.15s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .btn-primary:hover {
            background: var(--primary-yellow-hover);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: transparent;
            border: 1.5px solid #D1D5DB;
            color: var(--black-text);
            padding: 14px 32px;
            border-radius: var(--radius-md);
            font-weight: 500;
            font-size: 15px;
            cursor: pointer;
            transition: all 0.15s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }
        .btn-outline:hover {
            border-color: var(--primary-yellow);
            color: var(--primary-yellow);
            background: var(--primary-yellow-light);
        }

        .hero-right {
            display: flex;
            justify-content: center;
            position: relative;
        }
        .data-cards-stack {
            position: relative;
            width: 100%;
            max-width: 360px;
            height: 340px;
        }
        .data-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-card);
            position: absolute;
            width: 220px;
            transition: transform 0.2s;
        }
        .data-card:nth-child(1) { top: 10px; left: 20px; transform: rotate(-2deg); z-index: 3; }
        .data-card:nth-child(2) { top: 30px; right: 20px; transform: rotate(2deg); z-index: 2; }
        .data-card:nth-child(3) { bottom: 10px; left: 40px; transform: rotate(0deg); z-index: 1; }
        .data-card .number {
            font-size: 48px;
            font-weight: 700;
            color: var(--primary-yellow);
            line-height: 1.1;
        }
        .data-card .label {
            font-size: 14px;
            color: var(--gray-text);
            margin-top: 8px;
        }

        /* 指标看板 */
        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .metric-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 32px 24px;
            box-shadow: var(--shadow-card);
            text-align: left;
            transition: box-shadow 0.2s, transform 0.2s;
        }
        .metric-card:hover {
            box-shadow: var(--shadow-card-hover);
        }
        .metric-card .tag {
            font-size: 13px;
            color: var(--gray-aux);
            margin-bottom: 12px;
        }
        .metric-card .value {
            font-size: 48px;
            font-weight: 700;
            color: var(--primary-yellow);
            line-height: 1.1;
            transition: transform 0.2s;
        }
        .metric-card:hover .value {
            transform: scale(1.05);
        }
        .metric-card .unit {
            font-size: 14px;
            color: var(--gray-text);
            margin-top: 6px;
        }

        /* 服务矩阵 */
        .services-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            grid-template-rows: auto auto;
            gap: 24px;
        }
        .service-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 32px;
            box-shadow: var(--shadow-card);
            transition: box-shadow 0.2s;
            display: flex;
            flex-direction: column;
            position: relative;
        }
        .service-card:hover {
            box-shadow: var(--shadow-card-hover);
        }
        .service-card.featured {
            flex-direction: row;
            align-items: center;
            gap: 32px;
        }
        .service-card .icon-large {
            font-size: 48px;
            color: var(--secondary-teal);
        }
        .service-card .icon-small {
            font-size: 32px;
            color: var(--primary-yellow);
            margin-bottom: 16px;
        }
        .service-card h3 {
            font-size: 18px;
            font-weight: 500;
            margin-bottom: 8px;
        }
        .service-card p {
            font-size: 14px;
            color: var(--gray-text);
            line-height: 1.5;
            margin-bottom: 16px;
        }
        .service-link {
            font-weight: 500;
            color: var(--secondary-teal);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap 0.2s;
            margin-top: auto;
        }
        .service-link:hover {
            gap: 8px;
        }

        /* 对比区 */
        .comparison-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-card);
            position: relative;
        }
        .comparison-col h3 {
            font-size: 20px;
            font-weight: 600;
            margin-bottom: 24px;
        }
        .compare-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .compare-item i {
            font-size: 18px;
        }
        .compare-item .fa-times {
            color: var(--gray-aux);
        }
        .compare-item .fa-check {
            color: var(--secondary-teal);
        }
        .highlight-bar {
            background: var(--primary-yellow-light);
            padding: 16px;
            border-radius: var(--radius-md);
            font-weight: 600;
            margin-bottom: 24px;
            color: var(--black-text);
        }

        /* FAQ */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 48px;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-light);
            padding: 20px 0;
            cursor: pointer;
        }
        .faq-question {
            font-size: 16px;
            font-weight: 500;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.25s ease-out, padding 0.25s;
            font-size: 15px;
            color: var(--gray-text);
            line-height: 1.6;
            padding-left: 16px;
            border-left: 2px solid transparent;
        }
        .faq-item.active .faq-answer {
            max-height: 200px;
            padding-top: 12px;
            border-left-color: var(--primary-yellow);
            background: rgba(255,184,0,0.02);
        }
        .faq-item.active .faq-question i {
            transform: rotate(45deg);
        }

        /* 联系表单 */
        .contact-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 48px;
            max-width: 720px;
            margin: 0 auto;
            box-shadow: var(--shadow-card);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-input);
            border-radius: var(--radius-md);
            font-size: 15px;
            transition: border 0.2s, box-shadow 0.2s;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--primary-yellow);
            box-shadow: 0 0 0 3px rgba(255,184,0,0.15);
        }
        .benefit-list {
            list-style: none;
        }
        .benefit-list li {
            display: flex;
            gap: 12px;
            margin-bottom: 24px;
            font-size: 15px;
            align-items: center;
        }
        .benefit-list i {
            color: var(--secondary-teal);
            font-size: 20px;
        }

        .footer {
            background: var(--white);
            padding: 60px 0 20px;
            border-top: 1px solid var(--border-light);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-col h4 {
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col a {
            display: block;
            font-size: 14px;
            color: var(--gray-aux);
            margin-bottom: 8px;
        }
        .footer-col a:hover {
            color: var(--primary-yellow);
        }
        .copyright {
            text-align: center;
            font-size: 13px;
            color: var(--gray-aux);
            padding-top: 20px;
            border-top: 1px solid var(--border-light);
        }

        @media (max-width: 1023px) {
            .hero .container { grid-template-columns: 1fr; }
            .metrics-grid { grid-template-columns: repeat(2,1fr); }
            .services-grid { grid-template-columns: 1fr 1fr; }
            .service-card.featured { grid-column: span 2; flex-direction: column; }
            .faq-grid { grid-template-columns: 1fr; }
            .comparison-wrapper { grid-template-columns: 1fr; }
        }
        @media (max-width: 767px) {
            .nav-menu, .btn-capsule.desktop-cta { display: none; }
            .hamburger { display: block; }
            .mobile-bottom-nav { display: flex; }
            section { padding: 80px 0; }
            .hero { padding-top: 80px; }
            .hero-left h1 { font-size: 28px; }
            .metrics-grid { grid-template-columns: 1fr 1fr; }
            .services-grid { grid-template-columns: 1fr; }
            .service-card.featured { grid-column: span 1; }
            .contact-card { grid-template-columns: 1fr; padding: 24px; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .data-cards-stack { height: auto; display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
            .data-card { position: static; width: 160px; transform: none !important; }
        }