/* roulang page: index */
:root {
            --primary: #E94057;
            --primary-deep: #C6283A;
            --accent: #00D9FF;
            --dark-base: #0D0D1A;
            --dark-surface: #1A1A2E;
            --gray-bg: #F5F5F7;
            --whitecard: #FFFFFF;
            --text-on-dark: #FFFFFF;
            --text-secondary-on-dark: #B0B0C0;
            --text-main: #1A1A2E;
            --text-secondary: #5A5A6E;
            --border-light: #E8E8EC;
            --border-input: #D0D0D8;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-btn: 10px;
            --radius-full: 999px;
            --shadow-sm: 0 2px 12px rgba(26,26,46,0.05);
            --shadow-card: 0 4px 20px rgba(26,26,46,0.08);
            --shadow-hover: 0 12px 32px rgba(233,64,87,0.12);
            --shadow-dark-card: 0 8px 28px rgba(0,0,0,0.3);
            --font-mono: 'Inter', 'SF Pro Display', system-ui, -apple-system, sans-serif;
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Hiragino Sans GB', sans-serif;
            --transition: 0.25s cubic-bezier(0.2, 0.0, 0, 1.0);
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.75;
            background-color: #ffffff;
            color: var(--text-main);
            overflow-x: hidden;
        }

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

        a, button {
            text-decoration: none;
            cursor: pointer;
            transition: var(--transition);
            font-family: var(--font-sans);
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 20px;
            }
        }

        /* 导航 */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 72px;
            background: rgba(13,13,26,0.75);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            z-index: 100;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            transition: background 0.3s, box-shadow 0.3s;
        }
        .navbar.scrolled {
            background: #0D0D1A;
            box-shadow: 0 4px 18px rgba(0,0,0,0.25);
            border-bottom-color: rgba(255,255,255,0.12);
        }
        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            font-size: 1.8rem;
            font-weight: 700;
            color: white;
            display: flex;
            align-items: center;
            letter-spacing: 1px;
        }
        .logo .brand-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, #E94057 0%, #C6283A 100%);
            border-radius: 10px;
            margin-right: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 16px rgba(233,64,87,0.35);
            font-size: 22px;
        }
        .nav-menu {
            display: flex;
            gap: 32px;
            align-items: center;
            list-style: none;
        }
        .nav-menu a {
            color: #D0D0E0;
            font-weight: 500;
            font-size: 0.95rem;
            position: relative;
            padding: 4px 0;
            transition: color 0.2s;
        }
        .nav-menu a:hover, .nav-menu a.active {
            color: #00D9FF;
        }
        .nav-menu a.active::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 100%;
            height: 2px;
            background: #E94057;
            border-radius: 4px;
        }
        .hamburger{
            display: none;
            flex-direction: column;
            gap: 5px;
            background: transparent;
            border: none;
        }
        .hamburger span{
            width: 24px;
            height: 2.5px;
            background: white;
            border-radius: 4px;
            transition: 0.3s;
        }
        .mobile-panel {
            position: fixed;
            top: 0;
            right: -100%;
            width: 100%;
            height: 100vh;
            background: #0D0D1A;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            z-index: 200;
            transition: right 0.3s ease;
            gap: 36px;
        }
        .mobile-panel.active {
            right: 0;
        }
        .mobile-panel a {
            font-size: 1.4rem;
            color: #fff;
            font-weight: 600;
        }
        .mobile-panel .close-btn {
            position: absolute;
            top: 28px;
            right: 28px;
            background: transparent;
            border: none;
            color: white;
            font-size: 32px;
        }

        @media (max-width: 768px) {
            .nav-menu { display: none; }
            .hamburger { display: flex; }
        }

        .btn-primary {
            background: var(--primary);
            color: white;
            font-weight: 600;
            border-radius: var(--radius-btn);
            padding: 12px 28px;
            border: none;
            display: inline-block;
            text-align: center;
            font-size: 0.95rem;
        }
        .btn-primary:hover {
            background: #C6283A;
            transform: scale(1.02);
            box-shadow: 0 8px 18px rgba(233,64,87,0.4);
        }
        .btn-outline {
            border: 2px solid var(--primary);
            color: white;
            background: transparent;
            padding: 10px 26px;
            border-radius: var(--radius-btn);
            font-weight: 600;
        }

        /* Hero */
        .hero {
            min-height: 80vh;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            position: relative;
            display: flex;
            align-items: center;
            background-attachment: fixed;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(13,13,26,0.88) 0%, rgba(26,26,46,0.7) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 720px;
        }
        .hero h1 {
            font-size: clamp(2.5rem, 6vw, 3.8rem);
            font-weight: 800;
            line-height: 1.2;
            color: white;
            margin-bottom: 20px;
        }
        .hero .subtitle {
            font-size: 1.1rem;
            color: #D0D0E0;
            margin-bottom: 32px;
            max-width: 500px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .floating-stats {
            position: absolute;
            bottom: 60px;
            right: 40px;
            background: rgba(13,13,26,0.75);
            backdrop-filter: blur(10px);
            padding: 16px 24px;
            border-radius: 14px;
            color: white;
            display: flex;
            gap: 28px;
        }
        .stat-item strong {
            font-size: 1.8rem;
            color: #00D9FF;
            font-family: var(--font-mono);
            display: block;
        }

        section {
            padding: 90px 0;
        }
        @media (max-width: 768px) {
            section { padding: 60px 0; }
        }
        .section-title {
            font-size: 2.1rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .bg-gray { background: #F5F5F7; }
        .text-accent { color: #00D9FF; }

        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3,1fr);
            gap: 28px;
        }
        @media (max-width: 768px) {
            .grid-3 { grid-template-columns: 1fr; }
        }
        .pain-card {
            background: white;
            padding: 28px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            transition: all 0.25s;
        }
        .pain-card:hover { box-shadow: var(--shadow-hover); transform: translateY(-4px); }

        .solution-row {
            display: flex;
            align-items: center;
            gap: 48px;
            margin: 56px 0;
        }
        .solution-img img {
            border-radius: 16px;
            width: 100%;
            box-shadow: 0 10px 24px rgba(0,0,0,0.2);
        }
        @media(max-width:768px){ .solution-row{flex-direction: column;} }

        .metric-grid {
            display: grid;
            grid-template-columns: repeat(4,1fr);
            gap: 24px;
            text-align: center;
        }
        .metric-num {
            font-size: 3.2rem;
            font-weight: 800;
            font-family: var(--font-mono);
            color: #E94057;
        }

        .case-card {
            background: white;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow-card);
        }
        .testimonial-card {
            background: #F8F8FA;
            padding: 28px;
            border-radius: 12px;
        }
        .faq-item {
            border-bottom: 1px solid #E8E8EC;
            padding: 16px 0;
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            font-weight: 600;
            cursor: pointer;
        }

        footer {
            background: #0D0D1A;
            color: #B0B0C0;
            padding: 60px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
        }
        @media(max-width:768px){ .footer-grid{grid-template-columns:1fr 1fr;} }

        .form-input {
            width: 100%;
            padding: 14px;
            border: 1px solid #D0D0D8;
            border-radius: 8px;
            margin-top: 6px;
        }
        .cta-big {
            background: #E94057;
            color: white;
            padding: 18px 48px;
            font-size: 18px;
            border-radius: 10px;
            box-shadow: 0 12px 24px rgba(233,64,87,0.5);
        }