/* roulang page: index */
:root {
            --primary: #D4343E;
            --primary-deep: #B01E28;
            --accent-deep: #1A1A2E;
            --accent-dark: #252545;
            --gold: #F0C040;
            --gold-light: #F5D76E;
            --bg: #FAFAFC;
            --card-bg: #FFFFFF;
            --text: #2D2D3A;
            --text-secondary: #6B6B7B;
            --border: #E8E8F0;
            --radius-xl: 20px;
            --radius-lg: 14px;
            --radius-md: 10px;
            --radius-sm: 8px;
            --radius-icon: 16px;
            --shadow-card: 0 4px 24px rgba(26, 26, 46, 0.08);
            --shadow-card-hover: 0 12px 40px rgba(26, 26, 46, 0.15);
            --shadow-btn: 0 4px 14px rgba(212, 52, 62, 0.3);
            --shadow-btn-hover: 0 8px 24px rgba(212, 52, 62, 0.45);
            --shadow-nav: 0 1px 0 rgba(0,0,0,0.05), 0 4px 16px rgba(0,0,0,0.04);
            --shadow-hero: 0 20px 60px rgba(26, 26, 46, 0.12);
            --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
            --font-en: "Inter", "SF Pro Display", system-ui, sans-serif;
            --gradient-primary: linear-gradient(135deg, #D4343E 0%, #E8555F 100%);
            --gradient-dark: linear-gradient(160deg, #1A1A2E 0%, #252545 100%);
            --gradient-gold: linear-gradient(135deg, #F0C040 0%, #F5D76E 100%);
            --gradient-card: linear-gradient(180deg, #FFFFFF 0%, #FAFAFC 100%);
            --container-max: 1280px;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font-cn);
            color: var(--text);
            background-color: var(--bg);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-xl);
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.25s ease;
        }
        a:hover {
            color: var(--primary);
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            outline: none;
            transition: all 0.25s ease;
        }

        h1, h2, h3, h4, h5, h6 {
            font-weight: 600;
            line-height: 1.3;
            color: var(--text);
        }

        h1 { font-size: 3rem; font-weight: 700; letter-spacing: -0.02em; }
        h2 { font-size: 2.25rem; font-weight: 600; }
        h3 { font-size: 1.375rem; font-weight: 600; }

        .container {
            width: 100%;
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* 导航栏 */
        .nav {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            box-shadow: var(--shadow-nav);
            transition: all 0.3s ease;
        }
        .nav.scrolled {
            background: rgba(255,255,255,0.98);
            box-shadow: 0 4px 20px rgba(0,0,0,0.08);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--gradient-primary);
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.2rem;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }
        .nav-links a {
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text);
            position: relative;
            padding-bottom: 4px;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            transition: width 0.3s ease;
            border-radius: 2px;
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }
        .nav-links a:hover {
            color: var(--primary);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 24px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            letter-spacing: 0.02em;
            transition: all 0.3s ease;
            white-space: nowrap;
            text-decoration: none;
        }
        .btn-primary {
            background: var(--gradient-primary);
            color: #fff;
            box-shadow: var(--shadow-btn);
        }
        .btn-primary:hover {
            box-shadow: var(--shadow-btn-hover);
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            border: 1px solid var(--border);
            color: var(--text);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: rgba(212,52,62,0.04);
        }
        .btn-large {
            padding: 16px 40px;
            font-size: 1.1rem;
            border-radius: var(--radius-lg);
        }
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            z-index: 60;
        }
        .hamburger span {
            width: 26px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: all 0.3s ease;
            display: block;
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }
        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: rgba(255,255,255,0.98);
            backdrop-filter: blur(20px);
            z-index: 55;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 32px;
            opacity: 0;
            visibility: hidden;
            transition: all 0.4s ease;
        }
        .mobile-menu.open {
            opacity: 1;
            visibility: visible;
        }
        .mobile-menu a {
            font-size: 1.4rem;
            font-weight: 600;
        }
        .mobile-menu .btn-primary {
            font-size: 1.1rem;
            padding: 14px 36px;
        }

        /* Hero */
        .hero {
            position: relative;
            padding: 80px 0 100px;
            overflow: hidden;
            background: radial-gradient(ellipse at 75% 30%, rgba(212,52,62,0.06) 0%, transparent 60%),
                        radial-gradient(ellipse at 25% 70%, rgba(240,192,64,0.04) 0%, transparent 50%);
            background-color: var(--bg);
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(212,52,62,0.08);
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 24px;
        }
        .hero-title {
            font-size: 3.2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 16px;
            color: var(--text);
            line-height: 1.2;
        }
        .hero-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: 32px;
            max-width: 480px;
            line-height: 1.7;
        }
        .hero-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            margin-bottom: 32px;
        }
        .trust-row {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 0.85rem;
            color: var(--text-secondary);
            align-items: center;
        }
        .trust-item {
            display: flex;
            align-items: center;
            gap: 6px;
            font-weight: 500;
        }
        .trust-item .dot {
            width: 8px;
            height: 8px;
            background: var(--gold);
            border-radius: 50%;
            flex-shrink: 0;
        }
        .hero-visual {
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .hero-visual img {
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-hero);
            width: 100%;
            max-width: 500px;
        }

        /* 通用板块 */
        section {
            padding: 100px 0;
        }
        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }
        .section-header h2 {
            margin-bottom: 12px;
            color: var(--text);
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

        /* 优势卡片 */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .card-advantage {
            background: var(--card-bg);
            border-radius: var(--radius-xl);
            padding: 32px;
            box-shadow: var(--shadow-card);
            transition: all 0.35s ease;
            position: relative;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
        }
        .card-advantage:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-card-hover);
        }
        .icon-box {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-icon);
            background: rgba(212,52,62,0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
            font-size: 1.6rem;
            color: var(--primary);
            flex-shrink: 0;
        }
        .card-advantage h3 {
            margin-bottom: 8px;
            font-size: 1.3rem;
        }
        .card-advantage p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.6;
            flex-grow: 1;
        }
        .badge-data {
            display: inline-block;
            background: var(--gradient-gold);
            color: #1A1A2E;
            padding: 6px 14px;
            border-radius: var(--radius-sm);
            font-family: var(--font-en);
            font-weight: 700;
            font-size: 0.85rem;
            margin-top: 16px;
            letter-spacing: 0.02em;
        }

        /* 功能分组 */
        .feature-group {
            display: flex;
            flex-direction: column;
            gap: 40px;
        }
        .feature-row {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .card-feature {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 20px 24px;
            display: flex;
            align-items: center;
            gap: 16px;
            transition: all 0.3s ease;
        }
        .card-feature:hover {
            border-color: var(--primary);
            box-shadow: 0 4px 16px rgba(212,52,62,0.08);
        }
        .card-feature .icon-sm {
            width: 44px;
            height: 44px;
            border-radius: var(--radius-md);
            background: rgba(212,52,62,0.06);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--primary);
            flex-shrink: 0;
        }
        .card-feature h4 {
            font-size: 1.05rem;
            margin-bottom: 2px;
        }
        .card-feature p {
            font-size: 0.85rem;
            color: var(--text-secondary);
        }

        /* 场景区 */
        .scene-block {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
            margin-bottom: 60px;
        }
        .scene-block.reverse {
            direction: rtl;
        }
        .scene-block.reverse > * {
            direction: ltr;
        }
        .scene-img img {
            border-radius: var(--radius-xl);
            box-shadow: var(--shadow-card);
            width: 100%;
        }
        .scene-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-top: 12px;
        }
        .tag {
            background: #F0F0F5;
            color: var(--text-secondary);
            padding: 5px 14px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 500;
        }

        /* 数据区 */
        .stats-bar {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            margin-bottom: 60px;
        }
        .stat-item {
            text-align: center;
        }
        .stat-number {
            font-family: var(--font-en);
            font-size: 3rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.01em;
            margin-bottom: 8px;
        }
        .stat-label {
            color: var(--text-secondary);
            font-size: 0.95rem;
            font-weight: 500;
        }
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .card-case {
            background: var(--card-bg);
            border-radius: var(--radius-xl);
            padding: 28px;
            border-left: 4px solid var(--primary);
            box-shadow: var(--shadow-card);
            transition: all 0.3s ease;
        }
        .card-case:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }
        .card-case .quote {
            font-style: italic;
            color: var(--text);
            margin-bottom: 16px;
            line-height: 1.7;
        }
        .card-case .user {
            font-weight: 600;
            font-size: 0.9rem;
        }
        .card-case .user-role {
            font-size: 0.8rem;
            color: var(--text-secondary);
        }

        /* FAQ */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #FAFAFC;
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all 0.3s ease;
            border: 1px solid transparent;
        }
        .faq-item.open {
            background: #fff;
            border-color: #E8E8F0;
            box-shadow: var(--shadow-card);
        }
        .faq-question {
            width: 100%;
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text);
            text-align: left;
            transition: all 0.2s ease;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            border: 2px solid var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: var(--primary);
            flex-shrink: 0;
            transition: transform 0.3s ease;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 24px 20px;
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-answer {
            display: block;
        }

        /* CTA */
        .cta-section {
            background: var(--gradient-dark);
            border-radius: var(--radius-xl);
            margin: 0 24px;
            padding: 80px 40px;
            text-align: center;
            max-width: var(--container-max);
            margin-left: auto;
            margin-right: auto;
            position: relative;
            overflow: hidden;
        }
        .cta-section h2 {
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section .sub {
            color: rgba(255,255,255,0.7);
            margin-bottom: 32px;
            font-size: 1.05rem;
        }
        .cta-section .btn-primary {
            font-size: 1.15rem;
            padding: 16px 48px;
        }
        .cta-section .small-link {
            display: block;
            margin-top: 16px;
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
            text-decoration: none;
        }
        .cta-section .small-link:hover {
            color: #fff;
        }

        /* Footer */
        .footer {
            background: var(--accent-deep);
            color: rgba(255,255,255,0.7);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            font-size: 1.5rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            display: block;
        }
        .footer-slogan {
            color: rgba(255,255,255,0.5);
            font-size: 0.9rem;
            line-height: 1.6;
        }
        .footer h4 {
            color: #fff;
            margin-bottom: 16px;
            font-size: 0.95rem;
        }
        .footer ul {
            list-style: none;
        }
        .footer ul li {
            margin-bottom: 8px;
        }
        .footer ul li a {
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
            text-decoration: none;
            transition: color 0.2s;
        }
        .footer ul li a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.1);
            padding-top: 24px;
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }

        @media (max-width: 1024px) {
            .cards-grid { grid-template-columns: repeat(2, 1fr); }
            .feature-row { grid-template-columns: repeat(2, 1fr); }
            .cases-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(3, 1fr); }
            .hero-grid { grid-template-columns: 1fr; text-align: center; }
            .hero-subtitle { margin: 0 auto 24px; }
            .hero-cta-group { justify-content: center; }
            .trust-row { justify-content: center; }
            .hero-visual { order: -1; }
            .stats-bar { grid-template-columns: repeat(2, 1fr); }
            .scene-block { grid-template-columns: 1fr; }
            .scene-block.reverse { direction: ltr; }
            h1 { font-size: 2.5rem; }
            h2 { font-size: 2rem; }
        }

        @media (max-width: 768px) {
            section { padding: 60px 0; }
            .nav-links { display: none; }
            .nav .btn-primary { display: none; }
            .hamburger { display: flex; }
            .mobile-menu { display: flex; }
            .cards-grid { grid-template-columns: 1fr; }
            .feature-row { grid-template-columns: 1fr; }
            .cases-grid { grid-template-columns: 1fr; }
            .stats-bar { grid-template-columns: repeat(2, 1fr); }
            .stat-number { font-size: 2.2rem; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .hero-title { font-size: 2rem; }
            .cta-section { padding: 50px 24px; border-radius: 0; margin: 0; }
            .container { padding-left: 16px; padding-right: 16px; }
        }
        @media (max-width: 480px) {
            .hero-cta-group { flex-direction: column; width: 100%; }
            .hero-cta-group .btn { width: 100%; }
        }