/* roulang page: index */
:root {
      --deep-ocean: #0A1929;
      --electric-cyan: #00E5FF;
      --sport-orange: #FF6B35;
      --dark-blue-gray: #112240;
      --glass-bg: rgba(17, 34, 64, 0.6);
      --glass-border: rgba(0, 229, 255, 0.15);
      --glass-border-hover: rgba(0, 229, 255, 0.5);
      --text-white: rgba(255, 255, 255, 0.9);
      --text-muted: #8892B0;
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
      --shadow-glow: 0 8px 40px rgba(0,229,255,0.25);
      --btn-glow: 0 0 20px rgba(0,229,255,0.5), 0 0 60px rgba(0,229,255,0.2);
      --font-mono: 'Roboto Mono', 'DIN Alternate', monospace;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 50% 10%, #0e2740, var(--deep-ocean) 80%);
      color: var(--text-white);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.35s ease, backdrop-filter 0.35s ease, box-shadow 0.35s ease;
      padding: 16px 0;
    }
    .navbar.scrolled {
      background: rgba(10, 25, 41, 0.85);
      backdrop-filter: blur(15px);
      box-shadow: 0 1px 0 rgba(0, 229, 255, 0.2);
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 1.6rem;
      font-weight: 700;
      color: #fff;
      text-decoration: none;
      letter-spacing: 0.5px;
      z-index: 1001;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--electric-cyan), #0097A7);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      color: #fff;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-weight: 500;
      transition: color 0.2s;
      font-size: 0.95rem;
    }
    .nav-links a:hover {
      color: var(--electric-cyan);
    }
    .btn-nav {
      background: transparent;
      border: 1.5px solid var(--electric-cyan);
      color: var(--electric-cyan);
      padding: 10px 24px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.3s ease;
      display: inline-block;
    }
    .btn-nav:hover {
      background: rgba(0, 229, 255, 0.15);
      box-shadow: 0 0 18px rgba(0, 229, 255, 0.5);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      z-index: 1002;
    }
    .hamburger span {
      width: 26px;
      height: 2px;
      background: #fff;
      border-radius: 2px;
      transition: 0.3s;
    }
    .mobile-menu {
      display: none;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      padding: 120px 0 60px;
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 700;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, var(--electric-cyan), #B2EBF2);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
      line-height: 1.2;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 32px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--sport-orange), #FF8C42);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      box-shadow: 0 0 20px rgba(255,107,53,0.5);
      transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
      border: none;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(255,107,53,0.8);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--electric-cyan);
      color: var(--electric-cyan);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.3s ease;
    }
    .btn-secondary:hover {
      background: rgba(0,229,255,0.12);
    }
    .data-panel {
      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 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.25s;
    }
    .stat-value {
      font-family: var(--font-mono);
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--electric-cyan);
      text-shadow: 0 0 12px rgba(0,229,255,0.5);
    }
    .trend-up {
      color: #4CAF50;
      font-weight: 700;
    }
    /* 区块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 600;
      margin-bottom: 16px;
      color: #fff;
      text-align: center;
    }
    .section-sub {
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 48px;
    }
    /* 服务矩阵 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 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 0.3s ease;
      text-decoration: none;
      color: inherit;
    }
    .service-card:hover {
      border-color: var(--glass-border-hover);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }
    .service-icon {
      font-size: 36px;
      margin-bottom: 16px;
    }
    /* 对比区 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 0;
      position: relative;
    }
    .divider-glow {
      width: 2px;
      background: linear-gradient(to bottom, transparent, var(--electric-cyan), transparent);
      margin: 0 24px;
    }
    .compare-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border-radius: var(--radius-card);
      padding: 32px;
    }
    .compare-right {
      border: 1px solid var(--electric-cyan);
    }
    /* FAQ */
    .faq-item {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: 12px;
      margin-bottom: 16px;
      overflow: hidden;
      transition: 0.2s;
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      background: rgba(0,0,0,0.2);
      padding: 0 24px;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
    }
    /* 表单 */
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      border-radius: 24px;
      padding: 48px;
      border: 1px solid var(--glass-border);
    }
    .input-field {
      width: 100%;
      padding: 14px 18px;
      background: rgba(0,0,0,0.3);
      border: 1px solid rgba(0,229,255,0.3);
      border-radius: var(--radius-input);
      color: #fff;
      margin-bottom: 20px;
      transition: 0.2s;
    }
    .input-field:focus {
      outline: none;
      border-color: var(--electric-cyan);
      box-shadow: 0 0 12px rgba(0,229,255,0.4);
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .compare-wrapper { grid-template-columns: 1fr; }
      .divider-glow { display: none; }
      .form-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 767px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .mobile-menu {
        display: none;
        position: fixed;
        top: 0; left: 0;
        width: 100%; height: 100%;
        background: rgba(10,25,41,0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        z-index: 999;
      }
      .mobile-menu.active { display: flex; }
      .hero-title { font-size: 36px; }
      .section-title { font-size: 28px; }
      .service-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }