/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --cyan-electric: #00F0FF;
      --orange-compet: #FF6B35;
      --text-primary: rgba(255,255,255,0.85);
      --text-secondary: rgba(255,255,255,0.55);
      --card-bg: rgba(255,255,255,0.04);
      --card-border: rgba(255,255,255,0.10);
      --card-shadow: 0 8px 32px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.08);
      --radius-card: 20px;
      --radius-btn: 50px;
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    * {
      box-sizing: border-box;
    }
    body {
      background-color: var(--deep-space);
      color: var(--text-primary);
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      margin: 0;
      line-height: 1.7;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3 {
      font-weight: 700;
      letter-spacing: -0.5px;
      line-height: 1.2;
      color: white;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    /* 玻璃卡片 */
    .glass-card {
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(24px) saturate(180%);
      border: 1px solid rgba(255,255,255,0.10);
      border-radius: var(--radius-card);
      box-shadow: var(--card-shadow);
      padding: 2rem;
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      border-color: rgba(0,240,255,0.35);
      box-shadow: 0 12px 40px rgba(0,240,255,0.15), 0 0 0 1px rgba(0,240,255,0.2) inset;
      transform: translateY(-4px);
    }
    /* 数据卡片变体 */
    .data-card {
      background: rgba(0,0,0,0.35);
      border-top: 2px solid var(--cyan-electric);
      border-radius: var(--radius-card);
      padding: 1.75rem;
      text-align: center;
      box-shadow: 0 8px 24px rgba(0,0,0,0.5);
      transition: var(--transition-smooth);
    }
    .data-card .metric {
      font-family: 'Orbitron', 'Rajdhani', sans-serif;
      font-size: 2.5rem;
      color: var(--cyan-electric);
      text-shadow: 0 0 20px rgba(0,240,255,0.6);
      font-weight: 800;
    }
    /* 按钮系统 */
    .btn-glow {
      background: var(--cyan-electric);
      color: var(--deep-space);
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      box-shadow: 0 0 24px rgba(0,240,255,0.5), 0 4px 12px rgba(0,240,255,0.3);
      border: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-glow:hover {
      box-shadow: 0 0 40px rgba(0,240,255,0.8);
      background: #33F5FF;
      transform: scale(1.05);
    }
    .btn-ghost {
      border: 2px solid var(--cyan-electric);
      color: var(--cyan-electric);
      background: transparent;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
    }
    .btn-ghost:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 20px rgba(0,240,255,0.3);
    }
    .btn-cta {
      background: var(--orange-compet);
      color: white;
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      box-shadow: 0 0 24px rgba(255,107,53,0.5);
      border: none;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-cta:hover {
      box-shadow: 0 0 40px rgba(255,107,53,0.8);
      background: #FF8255;
      transform: scale(1.05);
    }
    .section-padding {
      padding-top: 6rem;
      padding-bottom: 6rem;
    }
    /* 导航 */
    .nav-glass {
      background: rgba(10,14,39,0.8);
      backdrop-filter: blur(20px);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .nav-link {
      color: rgba(255,255,255,0.8);
      text-decoration: none;
      font-weight: 500;
      position: relative;
      transition: color 0.2s;
    }
    .nav-link:hover, .nav-link-active {
      color: var(--cyan-electric);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      width: 0;
      height: 2px;
      background: var(--cyan-electric);
      transition: all 0.3s ease;
      transform: translateX(-50%);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    /* 移动端底部导航 */
    .bottom-nav {
      background: rgba(10,14,39,0.95);
      backdrop-filter: blur(24px);
      border-top: 1px solid rgba(255,255,255,0.12);
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }
    .faq-item.active .faq-content {
      max-height: 200px;
    }
    input, select {
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 12px;
      padding: 14px;
      color: white;
      transition: all 0.2s;
    }
    input:focus {
      outline: none;
      border-color: var(--cyan-electric);
      box-shadow: 0 0 12px rgba(0,240,255,0.3);
    }
    @media (max-width: 768px) {
      .section-padding {
        padding-top: 4rem;
        padding-bottom: 4rem;
      }
      .glass-card {
        padding: 1.25rem;
        border-radius: 16px;
      }
      .data-card .metric {
        font-size: 2rem;
      }
      h1 {
        font-size: 2.2rem !important;
      }
    }