/* roulang page: index */
:root {
      --primary: #0A1929;
      --accent: #00E5FF;
      --alert: #FF4655;
      --bg-light: #F5F7FA;
      --white: #FFFFFF;
      --text-dark: #1E293B;
      --text-secondary: #64748B;
      --border-color: #e2e8f0;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --accent-glow: 0 0 12px rgba(0,229,255,0.35);
      --alert-dark: #E63946;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Inter", "Poppins", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    
    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      z-index: 990;
      height: 64px;
      border-bottom: 1px solid #e5e7eb;
      box-shadow: 0 4px 10px rgba(0,0,0,0.02);
      transition: box-shadow 0.2s;
    }
    .main-header.scrolled {
      box-shadow: 0 8px 24px rgba(0,0,0,0.05);
    }
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 64px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: 700;
      font-size: 1.75rem;
      letter-spacing: -0.5px;
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s;
    }
    .logo:hover {
      color: var(--accent);
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: linear-gradient(135deg, var(--accent) 0%, #0ea5e9 100%);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 800;
      font-size: 1.2rem;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 0.95rem;
      transition: color 0.2s, border-bottom 0.2s;
      padding-bottom: 4px;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover,
    .nav-links a.active-nav {
      color: var(--accent);
      border-bottom-color: var(--accent);
    }
    .hamburger {
      display: none;
      background: transparent;
      border: none;
      font-size: 1.8rem;
      line-height: 1;
      cursor: pointer;
      color: var(--text-dark);
    }
    
    /* 区块通用 */
    section {
      padding-top: 72px;
      padding-bottom: 72px;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 0.75rem;
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 2.5rem;
    }
    
    /* Hero */
    #hero {
      min-height: 620px;
      background: linear-gradient(135deg, #0A1929 0%, #0f2333 100%);
      position: relative;
      display: flex;
      align-items: center;
      color: white;
      overflow: hidden;
      margin-top: 64px;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.3;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 1.2rem;
      letter-spacing: -0.5px;
    }
    .hero-highlight {
      color: var(--accent);
      text-shadow: 0 0 10px rgba(0,229,255,0.5);
    }
    .hero-desc {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 2rem;
    }
    .btn-group {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
    }
    .btn {
      padding: 0.8rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.2s ease;
      display: inline-block;
    }
    .btn-primary {
      background: var(--accent);
      color: var(--primary);
      box-shadow: 0 0 14px rgba(0,229,255,0.4);
    }
    .btn-primary:hover {
      background: #26ebff;
      box-shadow: 0 0 22px rgba(0,229,255,0.7);
      transform: translateY(-2px);
    }
    .btn-outline {
      border: 1px solid var(--accent);
      color: var(--accent);
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(0,229,255,0.1);
    }
    .btn-danger {
      background: var(--alert);
      color: white;
      box-shadow: 0 0 12px rgba(255,70,85,0.3);
    }
    .flat-btn-large {
      padding: 1rem 2.2rem;
      font-size: 1.1rem;
    }
    
    /* Stats */
    #stats .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 20px;
    }
    .stat-card {
      background: var(--white);
      padding: 1.5rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: all 0.2s;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--accent);
      font-family: "Inter", "Poppins", sans-serif;
    }
    .stat-label {
      color: var(--text-secondary);
      font-size: 0.9rem;
      margin-top: 0.3rem;
    }
    
    /* Services */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: all 0.25s;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .service-card:hover .service-img {
      transform: scale(1.03);
    }
    .service-body {
      padding: 1.25rem;
    }
    .service-body h3 {
      font-weight: 600;
      margin-bottom: 0.3rem;
    }
    .service-link {
      color: var(--accent);
      font-weight: 600;
      text-decoration: none;
      margin-top: 0.5rem;
      display: inline-block;
    }
    
    /* Compare */
    .compare-table-wrap {
      overflow-x: auto;
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }
    .compare-table th {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 1rem;
    }
    .compare-table td {
      padding: 1rem;
      border-bottom: 1px solid #e5e7eb;
      text-align: center;
      background: white;
    }
    .icon-check {
      color: var(--accent);
      font-weight: bold;
      font-size: 1.2rem;
    }
    .icon-cross {
      color: var(--alert);
      font-weight: bold;
    }
    
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-left: 4px solid var(--accent);
      margin-bottom: 1rem;
      background: var(--white);
      border-radius: 0 8px 8px 0;
      padding: 1.2rem;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .faq-num {
      color: var(--accent);
      font-weight: 800;
      font-size: 1.25rem;
    }
    .faq-answer {
      margin-top: 1rem;
      color: var(--text-secondary);
      background: #f1f5f9;
      padding: 0.8rem;
      border-radius: 6px;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    
    /* CTA */
    .cta-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .cta-form input, .cta-form select {
      width: 100%;
      padding: 0.9rem;
      margin-bottom: 1rem;
      border-radius: var(--radius-btn);
      border: 1px solid var(--border-color);
      background: var(--white);
    }
    
    /* Footer */
    .main-footer {
      background: var(--primary);
      color: #ccd6e0;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 30px;
    }
    
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: 1fr 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .cta-row { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        gap: 1.2rem;
        padding: 2rem;
      }
      .services-grid { grid-template-columns: 1fr; }
      #stats .stats-grid { grid-template-columns: 1fr; }
    }