/* roulang page: index */
:root {
      --primary: #E63946;
      --primary-dark: #c62d39;
      --secondary: #1D3557;
      --bg: #F8F9FA;
      --card-bg: #EDF2F4;
      --accent: #A8DADC;
      --text: #1D3557;
      --text-light: #6c7a89;
      --white: #ffffff;
      --border: #e0e6ed;
      --radius: 12px;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --font-title: 'Montserrat', 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font-body);
      background: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
    }
    a { text-decoration: none; color: inherit; }
    img { max-width: 100%; display: block; height: auto; }
    button, input, textarea { font-family: inherit; }
    .container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

    /* 导航 */
    .header {
      position: fixed; top: 0; left: 0; width: 100%; height: 72px;
      background: rgba(255,255,255,0.92); backdrop-filter: blur(12px);
      z-index: 1000; display: flex; align-items: center;
      box-shadow: 0 4px 20px rgba(0,0,0,0.02);
      transition: box-shadow 0.25s ease;
    }
    .header.scrolled { box-shadow: 0 8px 24px rgba(0,0,0,0.06); }
    .nav-wrap { display: flex; align-items: center; justify-content: space-between; width: 100%; }
    .logo {
      font-family: var(--font-title); font-weight: 800; font-size: 24px;
      letter-spacing: -0.5px; color: var(--secondary); display: flex; align-items: center;
    }
    .logo i { color: var(--primary); margin-right: 10px; font-size: 28px; }
    .nav-links { display: flex; gap: 40px; align-items: center; }
    .nav-links a {
      font-size: 15px; font-weight: 600; color: var(--secondary);
      position: relative; padding: 8px 0; transition: color 0.2s;
    }
    .nav-links a::after {
      content: ''; position: absolute; bottom: 0; left: 0; width: 0;
      height: 3px; background: var(--primary); border-radius: 4px;
      transition: width 0.2s ease;
    }
    .nav-links a:hover, .nav-links a.active { color: var(--primary); }
    .nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
    .hamburger { display: none; font-size: 24px; color: var(--secondary); cursor: pointer; }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu {
        position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
        background: rgba(255,255,255,0.98); backdrop-filter: blur(20px);
        display: flex; flex-direction: column; align-items: center; justify-content: center;
        gap: 32px; z-index: 999; transform: translateY(-100%); transition: transform 0.3s ease;
      }
      .mobile-menu.open { transform: translateY(0); }
      .mobile-menu a { font-size: 22px; font-weight: 600; color: var(--secondary); }
    }

    /* Hero */
    .hero {
      min-height: 100vh; display: flex; align-items: center;
      background: radial-gradient(circle at 20% 50%, #1D3557, #0B1E33);
      position: relative; overflow: hidden; padding-top: 72px;
    }
    .hero-bg {
      position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.15; mix-blend-mode: overlay;
    }
    .hero .container { display: flex; align-items: center; gap: 48px; position: relative; z-index: 2; }
    .hero-text { flex: 1; color: white; }
    .hero h1 {
      font-family: var(--font-title); font-size: 48px; line-height: 1.2; font-weight: 800;
      letter-spacing: -0.5px; margin-bottom: 24px;
    }
    .hero .subtitle { font-size: 18px; opacity: 0.9; margin-bottom: 32px; max-width: 540px; }
    .hero-stats {
      display: flex; gap: 32px; margin-bottom: 40px; flex-wrap: wrap;
    }
    .stat-item { display: flex; flex-direction: column; }
    .stat-number {
      font-family: var(--font-mono); font-size: 32px; font-weight: 700;
      color: var(--accent); letter-spacing: -0.5px;
    }
    .stat-label { font-size: 14px; opacity: 0.7; }
    .btn-group { display: flex; gap: 16px; flex-wrap: wrap; }
    .btn {
      display: inline-flex; align-items: center; justify-content: center;
      padding: 14px 32px; border-radius: 8px; font-weight: 600; font-size: 16px;
      transition: all 0.25s ease; cursor: pointer; border: none;
    }
    .btn-primary { background: var(--primary); color: white; }
    .btn-primary:hover { filter: brightness(1.1); box-shadow: 0 8px 16px rgba(230,57,70,0.4); transform: translateY(-2px); }
    .btn-outline { background: transparent; border: 2px solid #A8DADC; color: #A8DADC; }
    .btn-outline:hover { border-color: var(--primary); color: var(--primary); }
    .hero-visual { flex: 1; display: flex; justify-content: center; }
    .hero-visual img { max-width: 90%; border-radius: 16px; opacity: 0.9; }

    @media (max-width: 768px) {
      .hero .container { flex-direction: column; text-align: center; }
      .hero h1 { font-size: 32px; }
      .hero-stats { justify-content: center; }
      .btn-group { justify-content: center; }
      .hero-visual { display: none; }
    }

    /* 通用板块 */
    section { padding: 80px 0; }
    .section-title {
      font-family: var(--font-title); font-size: 36px; line-height: 1.3;
      font-weight: 700; margin-bottom: 16px; letter-spacing: -0.5px;
    }
    .section-desc { color: var(--text-light); margin-bottom: 48px; max-width: 600px; }

    /* 数据看板 */
    .dashboard-grid {
      display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    }
    .metric-card {
      background: var(--white); border-radius: var(--radius);
      padding: 32px; box-shadow: var(--shadow-sm);
      border-left: 4px solid var(--primary); transition: all 0.25s ease;
      position: relative;
    }
    .metric-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
    .metric-card .trend { position: absolute; top: 24px; right: 28px; font-size: 18px; }
    .metric-card .number {
      font-family: var(--font-mono); font-size: 36px; font-weight: 700;
      margin: 8px 0 6px;
    }
    .metric-card .label { font-size: 14px; color: var(--text-light); }
    @media (max-width: 768px) {
      .dashboard-grid { grid-template-columns: 1fr; }
    }

    /* 服务矩阵 非对称 */
    .service-matrix {
      display: grid; grid-template-columns: 1.2fr 0.8fr 0.8fr; gap: 24px;
    }
    .service-card {
      background: var(--white); border-radius: var(--radius); padding: 32px;
      box-shadow: var(--shadow-sm); transition: all 0.25s ease;
    }
    .service-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
    .large-card { background: linear-gradient(135deg, #FFF5F5, #FFE8E8); }
    .service-card i { font-size: 40px; color: var(--primary); margin-bottom: 16px; }
    .small-card i { font-size: 28px; color: var(--secondary); }
    @media (max-width: 768px) {
      .service-matrix { grid-template-columns: 1fr; }
    }

    /* 对比 */
    .comparison-wrap {
      display: grid; grid-template-columns: 1fr 1fr; gap: 32px;
    }
    .comp-col {
      padding: 40px; border-radius: var(--radius);
    }
    .comp-old { background: #EDF2F4; }
    .comp-new { background: #e6f7f8; }
    .comp-item { display: flex; align-items: center; gap: 12px; margin: 16px 0; }
    @media (max-width: 768px) {
      .comparison-wrap { grid-template-columns: 1fr; }
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border); padding: 20px 0;
    }
    .faq-question {
      display: flex; justify-content: space-between; align-items: center;
      font-weight: 600; font-size: 18px; cursor: pointer;
    }
    .faq-answer { max-height: 0; overflow: hidden; transition: 0.3s ease; color: var(--text-light); }
    .faq-item.open .faq-answer { max-height: 200px; margin-top: 12px; }

    /* CTA */
    .cta-section {
      background: var(--secondary); position: relative; overflow: hidden;
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover; background-position: center;
    }
    .cta-overlay { background: rgba(29,53,87,0.85); padding: 80px 0; }
    .cta-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
    .cta-left h2 { color: white; }
    .cta-form input, .cta-form textarea {
      width: 100%; padding: 12px 0; background: transparent; border: none;
      border-bottom: 2px solid rgba(255,255,255,0.4); color: white; margin-bottom: 20px;
      outline: none;
    }
    .cta-form button { width: 100%; }
    @media (max-width: 768px) {
      .cta-grid { grid-template-columns: 1fr; }
    }

    /* 页脚 */
    .footer {
      background: #1D3557; color: #B0C4DE; padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px;
    }
    .footer a { color: #B0C4DE; transition: 0.2s; }
    .footer a:hover { color: var(--primary); }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }