/* roulang page: index */
:root {
      --deep-bg: #060B1A;
      --primary: #0A0E27;
      --cyan: #00F0FF;
      --orange: #FF6B35;
      --orange-light: #FF8255;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(0, 240, 255, 0.15);
      --glass-border-hover: rgba(0, 240, 255, 0.4);
      --glow-cyan: 0 0 15px rgba(0, 240, 255, 0.5);
      --glow-orange: 0 0 30px rgba(255, 107, 53, 0.4);
      --text-primary: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #7B8FA1;
      --radius-card: 16px;
      --radius-btn: 12px;
      --shadow-card: 0 10px 25px -5px rgba(0,0,0,0.5);
      --font-sans: 'Inter', 'SF Pro Display', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: 0.3s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      background-color: var(--deep-bg);
    }
    body {
      font-family: var(--font-sans);
      background: var(--deep-bg);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    button, input, select {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.7);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid transparent;
      transition: background var(--transition), border-color var(--transition);
    }
    .site-header.scrolled {
      background: rgba(6, 11, 26, 0.96);
      border-bottom: 1px solid var(--glass-border);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--text-primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: baseline;
      gap: 6px;
      white-space: nowrap;
    }
    .logo .vip-badge {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--cyan);
      background: rgba(0,240,255,0.1);
      padding: 2px 8px;
      border-radius: 20px;
      letter-spacing: 0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-body);
      font-size: 0.95rem;
      transition: color var(--transition);
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--cyan);
    }
    .nav-cta {
      background: var(--orange);
      color: white;
      padding: 10px 20px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: var(--glow-orange);
      transition: background var(--transition), box-shadow var(--transition);
    }
    .nav-cta:hover {
      background: var(--orange-light);
      box-shadow: 0 0 30px rgba(255,107,53,0.7);
    }
    .mobile-nav {
      display: none;
    }
    /* 移动端底部导航 */
    .bottom-nav {
      display: none;
      position: fixed;
      bottom: 16px;
      left: 50%;
      transform: translateX(-50%);
      background: rgba(10,14,39,0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-radius: 30px;
      padding: 8px 20px;
      z-index: 999;
      border: 1px solid var(--glass-border);
      box-shadow: 0 10px 25px rgba(0,0,0,0.6);
      gap: 20px;
      width: max-content;
    }
    .bottom-nav a {
      color: var(--text-body);
      font-size: 0.8rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 4px;
      padding: 4px 8px;
      border-radius: 20px;
      transition: color var(--transition);
      font-weight: 500;
    }
    .bottom-nav a i { font-size: 1.2rem; }
    .bottom-nav a.active, .bottom-nav a:hover { color: var(--cyan); }

    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, #0f1a3a 0%, #060B1A 80%);
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.18;
      z-index: 0;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: clamp(2.4rem, 5vw, 3.8rem);
      font-weight: 800;
      line-height: 1.2;
      color: var(--text-primary);
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }
    .hero-content .subtitle {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--orange);
      color: white;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      cursor: pointer;
      box-shadow: var(--glow-orange);
      transition: background 0.2s, box-shadow 0.2s, transform 0.2s;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      animation: pulse 2s infinite;
    }
    .btn-primary:hover {
      background: var(--orange-light);
      box-shadow: 0 0 40px rgba(255,107,53,0.8);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--cyan);
      color: var(--cyan);
      padding: 14px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: background var(--transition), color var(--transition);
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.08);
    }
    @keyframes pulse {
      0% { box-shadow: 0 0 0 0 rgba(255,107,53,0.5); }
      70% { box-shadow: 0 0 0 15px rgba(255,107,53,0); }
      100% { box-shadow: 0 0 0 0 rgba(255,107,53,0); }
    }
    .stats-grid {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .stat-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .stat-number {
      font-size: 2.4rem;
      font-weight: 800;
      color: var(--cyan);
      text-shadow: 0 0 12px var(--cyan);
    }

    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .section-title::before {
      content: '';
      width: 3px;
      height: 28px;
      background: var(--cyan);
      border-radius: 2px;
    }
    .section-desc {
      color: var(--text-muted);
      max-width: 700px;
      margin-bottom: 48px;
    }

    /* 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }
    .service-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      padding: 32px;
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card.large {
      grid-row: span 1;
    }
    .service-card:hover {
      border-color: var(--glass-border-hover);
      transform: translateY(-6px);
      box-shadow: 0 20px 30px rgba(0,240,255,0.08);
    }
    .card-icon {
      font-size: 2.2rem;
      color: var(--cyan);
      margin-bottom: 20px;
    }
    .service-card h3 {
      font-size: 1.4rem;
      font-weight: 600;
      color: white;
      margin-bottom: 10px;
    }
    .stat-highlight {
      margin-top: 16px;
      font-weight: 700;
      color: var(--cyan);
    }

    /* 数据对比区 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
    }
    .compare-table {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-card);
      padding: 20px;
    }
    .table-row {
      display: flex;
      justify-content: space-between;
      padding: 14px 10px;
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .highlight { color: var(--cyan); font-weight: 700; }
    .chart-placeholder {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-card);
      padding: 20px;
      display: flex;
      align-items: flex-end;
      gap: 20px;
      justify-content: center;
      height: 220px;
    }
    .bar {
      width: 32px;
      background: var(--cyan);
      border-radius: 6px 6px 0 0;
      box-shadow: 0 0 12px var(--cyan);
    }

    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: 12px;
      overflow: hidden;
    }
    .faq-question {
      padding: 16px 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      color: white;
      background: rgba(255,255,255,0.02);
    }
    .faq-answer {
      padding: 0 20px 16px;
      color: var(--text-body);
      display: none;
    }
    .faq-item.open .faq-answer { display: block; }
    .badge {
      background: rgba(0,240,255,0.1);
      color: var(--cyan);
      padding: 2px 10px;
      border-radius: 20px;
      font-size: 0.7rem;
      margin-left: 12px;
    }

    /* CTA */
    .cta-section {
      background: #0A0E27;
    }
    .cta-card {
      max-width: 560px;
      margin: 0 auto;
      background: var(--glass-bg);
      backdrop-filter: blur(28px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      padding: 48px;
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-group input, .form-group select {
      width: 100%;
      padding: 14px;
      background: rgba(255,255,255,0.05);
      border: 1px solid var(--glass-border);
      border-radius: 10px;
      color: white;
    }
    .trust-badges {
      display: flex;
      justify-content: center;
      gap: 30px;
      margin-top: 24px;
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-bg);
      border-top: 1px solid rgba(255,255,255,0.05);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    .copyright {
      text-align: center;
      margin-top: 40px;
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    @media (max-width: 1024px) {
      .hero .container { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr 1fr; }
      .compare-grid { grid-template-columns: 1fr; }
      .faq-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .bottom-nav { display: flex; }
      .header-inner { justify-content: center; }
      .services-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero { text-align: center; }
      .hero-content h1 { font-size: 2.2rem; }
    }