/* roulang page: index */
:root {
      --primary-deep: #0A1128;
      --accent-cyan: #00F0FF;
      --gradient-start: #7B2FF7;
      --gradient-end: #00F0FF;
      --card-bg: rgba(255,255,255,0.05);
      --card-border: rgba(255,255,255,0.12);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255,255,255,0.7);
      --text-tertiary: rgba(255,255,255,0.5);
      --border-light: rgba(255,255,255,0.15);
      --shadow-glow: 0 0 20px rgba(0,240,255,0.5);
      --radius-card: 16px;
      --radius-btn: 30px;
      --spacing-section: 120px;
      --transition-smooth: all 0.3s ease;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--primary-deep);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    h1, h2, h3 {
      line-height: 1.2;
      font-weight: 600;
    }

    h1 {
      font-size: 48px;
      font-weight: 800;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    h2 {
      font-size: 36px;
      margin-bottom: 24px;
    }

    h3 {
      font-size: 24px;
      margin-bottom: 12px;
    }

    p {
      color: var(--text-secondary);
      margin-bottom: 16px;
    }

    a {
      color: var(--accent-cyan);
      text-decoration: none;
      transition: var(--transition-smooth);
    }

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

    /* 按钮系统 */
    .btn {
      display: inline-block;
      font-weight: 600;
      text-align: center;
      cursor: pointer;
      border: none;
      transition: var(--transition-smooth);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-size: 16px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
      color: #fff;
      box-shadow: var(--shadow-glow);
      border: none;
    }

    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,240,255,0.8);
      transform: scale(1.05);
      color: #fff;
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(0,240,255,0.6);
      color: var(--accent-cyan);
    }

    .btn-ghost:hover {
      background: rgba(0,240,255,0.1);
      color: var(--accent-cyan);
    }

    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10,17,40,0.85);
      backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      height: 70px;
      display: flex;
      align-items: center;
    }

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

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--accent-cyan);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .nav-links {
      display: flex;
      gap: 32px;
      list-style: none;
    }

    .nav-links a {
      color: rgba(255,255,255,0.8);
      font-weight: 500;
      transition: var(--transition-smooth);
    }

    .nav-links a:hover {
      color: #fff;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .search-icon, .login-link {
      color: var(--text-secondary);
      cursor: pointer;
      transition: var(--transition-smooth);
    }

    .search-icon:hover, .login-link:hover {
      color: var(--accent-cyan);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 24px;
      cursor: pointer;
    }

    /* 玻璃拟态卡片 */
    .glass-card {
      background: rgba(255,255,255,0.05);
      backdrop-filter: blur(12px);
      border: 1px solid var(--card-border);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: 0 8px 32px rgba(0,0,0,0.4);
      transition: var(--transition-smooth);
    }

    .glass-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 40px rgba(0,240,255,0.15);
    }

    /* 板块间距 */
    section {
      padding: var(--spacing-section) 0;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      section { padding: 80px 0; }
    }

    @media (max-width: 768px) {
      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(10,17,40,0.95);
        backdrop-filter: blur(20px);
        padding: 20px;
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-actions .btn {
        padding: 8px 16px;
        font-size: 14px;
      }
    }

    @media (max-width: 520px) {
      h1 { font-size: 28px; }
      h2 { font-size: 24px; }
    }

    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #1a2a5a, #0A1128);
      position: relative;
      overflow: hidden;
    }

    .hero-content {
      display: flex;
      align-items: center;
      gap: 40px;
    }

    .hero-text {
      flex: 1;
    }

    .hero-image {
      flex: 1;
      text-align: center;
    }

    .hero-image img {
      border-radius: 20px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      animation: float 6s ease-in-out infinite;
    }

    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-15px); }
      100% { transform: translateY(0px); }
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .pain-card i {
      font-size: 32px;
      color: var(--accent-cyan);
      margin-bottom: 16px;
    }

    /* 解决方案 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      position: relative;
    }

    .step-item {
      text-align: center;
      flex: 1;
    }

    .step-number {
      font-size: 48px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      text-align: center;
    }

    .stat-number {
      font-size: 42px;
      font-weight: 700;
      color: var(--accent-cyan);
    }

    /* 证言 */
    .testimonial-card {
      border-left: 4px solid var(--accent-cyan);
      padding-left: 24px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .faq-question {
      padding: 20px 0;
      font-weight: 500;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* CTA */
    #cta {
      background: radial-gradient(circle at center, #1e2a4f, #0A1128);
    }

    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      color: var(--text-tertiary);
    }

    @media (max-width: 768px) {
      .hero-content { flex-direction: column; }
      .pain-grid, .solutions-grid, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }