/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --primary-deep: #0A1F3F;
      --primary-blue: #1A5FEE;
      --accent-cyan: #00E5A0;
      --white: #FFFFFF;
      --bg-light: #F4F7FC;
      --text-primary: #0A1F3F;
      --text-secondary: #4A5568;
      --text-tertiary: #8899AA;
      --border-light: #E2E8F0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --shadow-card: 0 2px 12px rgba(10, 31, 63, 0.06);
      --shadow-hover: 0 8px 28px rgba(10, 31, 63, 0.10);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-mono: "Inter", system-ui, -apple-system, sans-serif;
      --transition: all 0.25s ease;
    }
    
    /* ----- 全局重置 ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    
    body {
      font-family: var(--font-sans);
      background-color: var(--white);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    button, input {
      font-family: inherit;
    }
    
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航栏 PC */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--primary-deep);
      letter-spacing: 0.5px;
    }
    
    .logo i {
      color: var(--primary-blue);
      font-size: 1.8rem;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-secondary);
      transition: color 0.2s;
      position: relative;
    }
    
    .nav-links a:hover {
      color: var(--primary-blue);
    }
    
    .nav-register-btn {
      background: var(--primary-blue);
      color: white !important;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition);
      box-shadow: 0 2px 8px rgba(26,95,238,0.25);
    }
    
    .nav-register-btn:hover {
      background: #1249C2;
      box-shadow: 0 4px 12px rgba(26,95,238,0.35);
      color: white !important;
    }
    
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 68px;
      background: white;
      border-top: 1px solid var(--border-light);
      box-shadow: 0 -4px 12px rgba(0,0,0,0.04);
      z-index: 1000;
      justify-content: space-around;
      align-items: center;
      padding: 0 8px;
    }
    
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 0.7rem;
      color: var(--text-tertiary);
      gap: 4px;
    }
    
    .mobile-nav-item i {
      font-size: 1.3rem;
    }
    
    .mobile-register-capsule {
      background: var(--primary-blue);
      color: white;
      width: 52px;
      height: 52px;
      border-radius: 30px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-top: -20px;
      box-shadow: 0 6px 18px rgba(26,95,238,0.4);
      font-size: 1.3rem;
    }
    
    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 48px;
      max-width: 680px;
    }
    
    /* Hero */
    #hero {
      padding: 140px 0 100px;
      background: linear-gradient(135deg, #FFFFFF 0%, #F4F7FC 100%);
    }
    
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    
    .hero-text h1 {
      font-size: 2.8rem;
      font-weight: 700;
      line-height: 1.3;
      color: var(--primary-deep);
      margin-bottom: 20px;
    }
    
    .hero-text p {
      font-size: 1.15rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    
    .btn-primary {
      background: var(--primary-blue);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      font-size: 1rem;
      box-shadow: 0 4px 10px rgba(26,95,238,0.2);
    }
    
    .btn-primary:hover {
      background: #1249C2;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(26,95,238,0.28);
    }
    
    .btn-outline {
      background: transparent;
      color: var(--primary-blue);
      border: 2px solid var(--primary-blue);
      padding: 12px 30px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
    }
    
    .btn-outline:hover {
      background: var(--primary-blue);
      color: white;
    }
    
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 360px;
      box-shadow: 0 20px 40px rgba(10,31,63,0.08);
    }
    
    /* 数据看板 */
    #stats {
      background: var(--white);
    }
    
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    
    .stat-card {
      background: var(--white);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      padding: 28px 20px;
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    
    .stat-number {
      font-family: var(--font-mono);
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--primary-blue);
      display: block;
    }
    
    .stat-label {
      color: var(--text-tertiary);
      font-size: 0.9rem;
      margin-top: 8px;
    }
    
    /* 服务矩阵 */
    #services {
      background: var(--bg-light);
    }
    
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    
    .service-icon {
      font-size: 2rem;
      color: var(--primary-blue);
      margin-bottom: 20px;
    }
    
    .service-card h3 {
      font-size: 1.3rem;
      margin-bottom: 12px;
    }
    
    .service-card p {
      color: var(--text-secondary);
      font-size: 0.95rem;
      flex: 1;
    }
    
    /* 对比区 */
    #compare {
      background: var(--white);
    }
    
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    
    .compare-card {
      border-radius: var(--radius-card);
      padding: 32px;
      background: var(--bg-light);
    }
    
    .compare-card.highlight {
      background: white;
      border: 2px solid var(--accent-cyan);
      box-shadow: 0 10px 25px rgba(0,229,160,0.08);
    }
    
    .compare-item {
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 14px 0;
      border-bottom: 1px solid var(--border-light);
    }
    
    .compare-item i {
      font-size: 1.2rem;
    }
    
    .text-success { color: var(--accent-cyan); }
    .text-muted { color: #ccc; }
    
    /* FAQ */
    #faq {
      background: var(--bg-light);
    }
    
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    
    details {
      background: white;
      border-radius: var(--radius-card);
      padding: 20px 24px;
      margin-bottom: 12px;
      box-shadow: var(--shadow-card);
      cursor: pointer;
      transition: var(--transition);
    }
    
    summary {
      font-weight: 600;
      font-size: 1.1rem;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    
    summary::-webkit-details-marker { display: none; }
    
    .faq-answer {
      margin-top: 16px;
      color: var(--text-secondary);
    }
    
    /* CTA */
    #cta {
      background: var(--bg-light);
    }
    
    .cta-card {
      background: white;
      max-width: 520px;
      margin: 0 auto;
      padding: 48px 32px;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(10,31,63,0.06);
      text-align: center;
    }
    
    .cta-card h2 {
      font-size: 2rem;
      margin-bottom: 12px;
    }
    
    .form-group {
      margin-bottom: 20px;
      text-align: left;
    }
    
    .form-group input {
      width: 100%;
      padding: 14px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-input);
      font-size: 1rem;
      transition: 0.2s;
    }
    
    .form-group input:focus {
      outline: none;
      border-color: var(--primary-blue);
      box-shadow: 0 0 0 3px rgba(26,95,238,0.15);
    }
    
    .btn-cta {
      background: var(--accent-cyan);
      color: var(--primary-deep);
      border: none;
      padding: 16px 32px;
      font-weight: 700;
      font-size: 1.2rem;
      border-radius: 50px;
      width: 100%;
      cursor: pointer;
      transition: var(--transition);
      margin-top: 8px;
    }
    
    .btn-cta:hover {
      background: #00FFB3;
      box-shadow: 0 0 20px rgba(0,229,160,0.5);
    }
    
    .form-note {
      font-size: 0.8rem;
      color: var(--text-tertiary);
      margin-top: 16px;
    }
    
    /* 页脚 */
    #footer {
      background: var(--primary-deep);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
    }
    
    .footer-col h4 {
      color: white;
      margin-bottom: 20px;
      font-size: 1.1rem;
    }
    
    .footer-links a {
      display: block;
      color: rgba(255,255,255,0.7);
      margin-bottom: 10px;
      font-size: 0.9rem;
    }
    
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 48px;
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: repeat(2, 1fr); }
    }
    
    @media (max-width: 768px) {
      .site-header { display: none; }
      .mobile-bottom-nav { display: flex; }
      section { padding: 60px 0; }
      .hero-text h1 { font-size: 2rem; }
      .services-grid, .compare-wrapper, .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }
    
    @media (max-width: 520px) {
      .container { padding: 0 16px; }
    }