/* roulang page: index */
:root {
      --deep-blue: #0B1D3A;
      --cyan: #00E5FF;
      --orange: #FF6D00;
      --text-primary: #E0E6F0;
      --text-secondary: #8899AA;
      --glass-bg: rgba(255, 255, 255, 0.05);
      --glass-border: rgba(255, 255, 255, 0.1);
      --glow-cyan: 0 0 20px rgba(0, 229, 255, 0.5);
      --glow-orange: 0 0 20px rgba(255, 109, 0, 0.6);
      --card-radius: 20px;
      --btn-radius: 12px;
      --transition: all 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      background: radial-gradient(circle at 30% 10%, #0A1128 0%, #0B1D3A 70%, #051020 100%);
      color: var(--text-primary);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      font-weight: 400;
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }
    h1, h2, h3, h4, .h1, .h2, .h3 {
      font-weight: 700;
      letter-spacing: -0.02em;
    }
    a {
      color: var(--cyan);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: #00ffff;
    }
    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 导航 */
    .navbar {
      background: rgba(10, 17, 40, 0.88);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255, 255, 255, 0.1);
      padding: 12px 0;
      transition: var(--transition);
    }
    .navbar-brand {
      font-size: 26px;
      font-weight: 700;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.5px;
    }
    .navbar-brand span {
      color: var(--cyan);
    }
    .navbar-nav .nav-link {
      color: #B0C4DE;
      font-weight: 500;
      font-size: 15px;
      margin: 0 6px;
      position: relative;
      transition: var(--transition);
    }
    .navbar-nav .nav-link:hover,
    .navbar-nav .nav-link.active {
      color: var(--cyan);
    }
    .navbar-nav .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      transition: width 0.25s;
    }
    .navbar-nav .nav-link:hover::after {
      width: 100%;
    }
    .btn-nav-cta {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      border-radius: 30px;
      padding: 8px 22px;
      font-weight: 600;
      font-size: 14px;
      display: flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition);
      box-shadow: 0 0 10px rgba(0,229,255,0.3);
    }
    .btn-nav-cta:hover {
      background: rgba(0,229,255,0.15);
      box-shadow: var(--glow-cyan);
      color: white;
    }
    .badge-live {
      background: #ff3300;
      color: white;
      border-radius: 20px;
      padding: 2px 10px;
      font-size: 12px;
      margin-left: 6px;
      animation: pulse 1.5s infinite;
    }
    @keyframes pulse {
      0% { opacity: 1; }
      50% { opacity: 0.7; }
      100% { opacity: 1; }
    }
    /* Hero */
    #hero {
      padding: 140px 0 100px;
      position: relative;
    }
    .hero-title {
      font-size: 52px;
      font-weight: 800;
      line-height: 1.2;
      color: white;
      text-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .hero-title span {
      color: var(--cyan);
    }
    .hero-sub {
      font-size: 20px;
      color: var(--text-secondary);
      max-width: 580px;
      margin: 20px 0 30px;
    }
    .btn-glow-cyan {
      background: linear-gradient(135deg, #00bcd4, #00e5ff);
      border: none;
      color: #020c1a;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: 40px;
      font-size: 18px;
      box-shadow: var(--glow-cyan);
      transition: var(--transition);
      letter-spacing: 0.5px;
    }
    .btn-glow-cyan:hover {
      box-shadow: 0 0 35px rgba(0,229,255,0.8);
      transform: translateY(-2px);
      color: #000;
    }
    .btn-outline-cyan {
      background: transparent;
      border: 1px solid var(--cyan);
      color: var(--cyan);
      font-weight: 600;
      padding: 13px 32px;
      border-radius: 40px;
      font-size: 16px;
      transition: var(--transition);
    }
    .btn-outline-cyan:hover {
      background: rgba(0,229,255,0.12);
      color: white;
      border-color: #00ffff;
    }
    .hero-img-wrap {
      position: relative;
      border-radius: 28px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.6), 0 0 0 2px rgba(0,229,255,0.25);
    }
    /* 卡片玻璃 */
    .glass-card {
      background: rgba(255, 255, 255, 0.04);
      backdrop-filter: blur(14px) saturate(180%);
      border: 1px solid rgba(255, 255, 255, 0.1);
      border-radius: var(--card-radius);
      box-shadow: 0 10px 30px rgba(0,0,0,0.5);
      transition: var(--transition);
      padding: 28px 24px;
      height: 100%;
    }
    .glass-card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,229,255,0.35);
      box-shadow: 0 18px 40px rgba(0,0,0,0.6);
    }
    .icon-circle {
      width: 52px;
      height: 52px;
      background: rgba(0,229,255,0.2);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--cyan);
      font-size: 24px;
      margin-bottom: 18px;
    }
    .section-title {
      font-size: 42px;
      font-weight: 700;
      margin-bottom: 16px;
      color: white;
    }
    .section-desc {
      color: var(--text-secondary);
      font-size: 18px;
      max-width: 700px;
    }
    /* 价格卡片 */
    .pricing-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 24px;
      padding: 36px 24px;
      transition: var(--transition);
    }
    .pricing-card.featured {
      border: 1px solid var(--orange);
      box-shadow: 0 0 28px rgba(255,109,0,0.5);
      background: rgba(255,109,0,0.05);
    }
    .price-number {
      font-size: 48px;
      font-weight: 800;
      color: white;
    }
    .btn-orange-glow {
      background: var(--orange);
      border: none;
      color: white;
      font-weight: 700;
      padding: 12px 30px;
      border-radius: 30px;
      box-shadow: 0 0 18px rgba(255,109,0,0.7);
    }
    /* FAQ */
    .accordion-button {
      background: transparent;
      color: var(--text-primary);
      font-weight: 600;
      border-bottom: 1px solid rgba(255,255,255,0.15);
      box-shadow: none;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(255,255,255,0.03);
      color: var(--cyan);
      box-shadow: none;
    }
    .accordion-item {
      background: transparent;
      border: none;
    }
    footer {
      background: rgba(0,0,0,0.4);
      border-top: 1px solid rgba(255,255,255,0.08);
      padding: 50px 0 20px;
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 36px;
      }
      .navbar-collapse {
        background: rgba(10,17,40,0.95);
        padding: 20px;
        border-radius: 16px;
      }
    }