/* roulang page: index */
:root {
      --bg-deep: #0B0A1A;
      --card-glass: rgba(30, 27, 46, 0.7);
      --primary-purple: #A855F7;
      --energy-orange: #F97316;
      --text-soft: #F5F3FF;
      --glow-purple: 0 0 18px rgba(168, 85, 247, 0.7);
      --glow-orange: 0 0 15px rgba(249, 115, 22, 0.6);
      --radius-card: 24px;
      --blur-glass: blur(12px);
      --border-glass: 1px solid rgba(255,255,255,0.08);
      --font-mono: 'JetBrains Mono', monospace;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-soft);
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--card-glass);
      backdrop-filter: var(--blur-glass);
      -webkit-backdrop-filter: var(--blur-glass);
      border: var(--border-glass);
      border-radius: var(--radius-card);
    }
    /* 自定义发光 */
    .glow-purple {
      box-shadow: var(--glow-purple);
    }
    .glow-orange {
      box-shadow: var(--glow-orange);
    }
    .btn-glow {
      background-color: var(--energy-orange);
      color: #0B0A1A;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: 40px;
      border: none;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 0 15px rgba(249, 115, 22, 0.5);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-glow:hover {
      box-shadow: 0 0 30px rgba(249, 115, 22, 0.8), 0 0 20px rgba(168,85,247,0.5);
      transform: translateY(-2px);
    }
    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.3);
      color: #F5F3FF;
      font-weight: 600;
      padding: 13px 32px;
      border-radius: 40px;
      cursor: pointer;
      backdrop-filter: blur(8px);
      transition: all 0.3s;
      display: inline-flex;
      align-items: center;
    }
    .btn-ghost:hover {
      border-color: var(--primary-purple);
      box-shadow: 0 0 15px rgba(168,85,247,0.4);
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(11, 10, 26, 0.8);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
    }
    .logo-text {
      font-family: 'Space Grotesk', sans-serif;
      font-weight: 700;
      font-size: 1.8rem;
      background: linear-gradient(135deg, #A855F7, #F97316);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .nav-links a {
      color: #e0d7fe;
      text-decoration: none;
      margin-left: 32px;
      font-weight: 500;
      transition: 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: var(--primary-purple);
      text-shadow: 0 0 8px rgba(168,85,247,0.7);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: #F5F3FF;
      cursor: pointer;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      height: calc(100vh - 72px);
      background: rgba(11,10,26,0.96);
      backdrop-filter: blur(20px);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 36px;
      z-index: 99;
    }
    .mobile-menu a {
      font-size: 1.8rem;
      color: #F5F3FF;
      text-decoration: none;
      font-weight: 600;
      transition: 0.3s;
    }
    .mobile-menu a:hover {
      color: var(--primary-purple);
      text-shadow: 0 0 15px #A855F7;
    }
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
      .navbar {
        height: 60px;
        padding: 0 20px;
      }
      .nav-links { display: none; }
      .hamburger { display: block; }
    }
    /* hero背景 */
    .hero-bg {
      background: radial-gradient(circle at 30% 30%, #2e1a47, #0B0A1A 80%);
      position: relative;
      overflow: hidden;
    }
    /* 数字滚动 */
    .counter {
      font-family: var(--font-mono);
      font-weight: 600;
    }
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .faq-question {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
      font-weight: 600;
      color: #F5F3FF;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #cbd5e0;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }