/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --primary-dark: #5A1FD6;
      --accent-orange: #FF6B35;
      --deep-indigo: #1A1A2E;
      --bg-light: #FAFAFA;
      --card-white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-gray: #6B7280;
      --border-light: #E5E7EB;
      --gradient-main: linear-gradient(135deg, #7B2FF7 0%, #5A1FD6 100%);
      --radius-card: 24px;
      --radius-mid: 16px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
      --header-height: 72px;
      --container-max: 1200px;
      --transition-sm: 0.2s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      font-weight: 400;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-sm);
    }

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

    /* 导航系统 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      z-index: 1000;
      background: rgba(26, 26, 46, 0.35);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      border-bottom: 1px solid rgba(255,255,255,0.1);
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
    }

    .header.scrolled {
      background: rgba(26, 26, 46, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 24px;
      color: white;
      letter-spacing: 1px;
    }

    .logo-icon {
      width: 34px;
      height: 34px;
      background: var(--gradient-main);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      color: white;
      box-shadow: 0 4px 12px rgba(123,47,247,0.4);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }

    .btn-nav {
      background: var(--gradient-main);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      border: none;
      transition: filter 0.2s, transform 0.2s;
    }

    .btn-nav:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
    }

    .hamburger span {
      width: 26px;
      height: 2px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }

    .mobile-menu {
      display: none;
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      background: radial-gradient(circle at 30% 40%, #2D1760, var(--deep-indigo));
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: var(--header-height);
    }

    .hero::before {
      content: "";
      position: absolute;
      width: 100%;
      height: 100%;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 400 400"><circle cx="50" cy="80" r="4" fill="%23ffffff15"/><circle cx="200" cy="30" r="6" fill="%23ffffff10"/></svg>') repeat;
      opacity: 0.6;
    }

    .hero-content {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      width: 100%;
      position: relative;
      z-index: 2;
    }

    .hero-text h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.25;
      color: white;
      margin-bottom: 20px;
    }

    .hero-text .subtitle {
      font-size: 20px;
      color: rgba(255,255,255,0.8);
      margin-bottom: 36px;
    }

    .cta-group {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--gradient-main);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      display: inline-block;
      transition: filter 0.25s, transform 0.25s;
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.02);
    }

    .btn-outline {
      border: 2px solid white;
      color: white;
      padding: 12px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: background 0.25s;
    }

    .btn-outline:hover {
      background: rgba(255,255,255,0.08);
    }

    .hero-dash {
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      border-radius: 32px;
      padding: 24px;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    /* 指标看板 */
    .metrics {
      margin-top: -60px;
      position: relative;
      z-index: 5;
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 28px 24px;
      box-shadow: var(--shadow-card);
      position: relative;
      transition: 0.2s;
    }

    .metric-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .metric-number {
      font-size: 44px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
    }

    .badge {
      position: absolute;
      top: 24px;
      right: 24px;
      background: var(--accent-orange);
      color: white;
      font-size: 12px;
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
    }

    /* 服务矩阵 */
    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
    }

    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: white;
      border-radius: 20px;
      padding: 28px;
      border: 1px solid var(--border-light);
      transition: 0.25s;
    }

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

    /* 对比卡片 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      align-items: center;
      gap: 20px;
    }

    .vs-badge {
      width: 64px;
      height: 64px;
      background: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
      box-shadow: var(--shadow-card);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
      cursor: pointer;
    }

    .faq-question {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 600;
    }

    .q-badge {
      width: 32px;
      height: 32px;
      background: var(--primary);
      color: white;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding-left: 48px;
      color: var(--text-gray);
    }

    .faq-item.open .faq-answer {
      max-height: 150px;
    }

    .cta-section {
      background: var(--gradient-main);
      border-radius: 40px;
      padding: 64px 32px;
      color: white;
    }

    .form-card {
      background: white;
      border-radius: 24px;
      padding: 32px;
      box-shadow: var(--shadow-hover);
    }

    input, textarea {
      width: 100%;
      padding: 14px;
      border: 1px solid #D1D5DB;
      border-radius: 8px;
      margin-bottom: 16px;
      font-size: 16px;
    }

    input:focus, textarea:focus {
      border-color: var(--primary);
      outline: none;
      box-shadow: 0 0 0 3px rgba(123,47,247,0.2);
    }

    .footer {
      background: var(--deep-indigo);
      color: #ccc;
      padding: 60px 0 30px;
    }

    @media (max-width: 1024px) {
      .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero-text h1 { font-size: 36px; }
      .metrics-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
    }