/* roulang page: index */
:root {
      --deep-space: #0A1128;
      --cyber-cyan: #00E5FF;
      --competition-orange: #FF6B35;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(0, 229, 255, 0.15);
      --glass-hover-border: rgba(0, 229, 255, 0.4);
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-muted: #6B7B8D;
      --glow-cyan: 0 0 20px rgba(0, 229, 255, 0.5);
      --glow-cyan-strong: 0 0 35px rgba(0, 229, 255, 0.8);
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background: linear-gradient(135deg, #0A1128 0%, #1A2340 100%);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: 16px;
      padding: 2rem;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
      transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    }
    .glass-card:hover {
      transform: translateY(-4px);
      border-color: var(--glass-hover-border);
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
    }
    /* 发光按钮 */
    .btn-glow {
      background: linear-gradient(135deg, #00E5FF 0%, #00B8D4 100%);
      color: white;
      font-weight: 700;
      border-radius: 8px;
      padding: 0.75rem 2rem;
      box-shadow: var(--glow-cyan);
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-glow:hover {
      box-shadow: var(--glow-cyan-strong);
      transform: scale(1.02);
      background: linear-gradient(135deg, #33EAFF 0%, #00C8E0 100%);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--cyber-cyan);
      color: var(--cyber-cyan);
      font-weight: 600;
      border-radius: 8px;
      padding: 0.75rem 2rem;
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(0, 229, 255, 0.1);
      border-color: white;
      color: white;
    }
    /* 导航 */
    .header-nav {
      position: fixed;
      top: 0;
      width: 100%;
      z-index: 50;
      background: rgba(10, 17, 40, 0.6);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(0, 229, 255, 0.1);
      transition: background 0.3s;
    }
    .header-nav.scrolled {
      background: rgba(10, 17, 40, 0.95);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .logo-text {
      font-size: 1.5rem;
      font-weight: 800;
      background: linear-gradient(135deg, #00E5FF, #FFFFFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .nav-link {
      color: var(--text-secondary);
      transition: color 0.2s;
      font-weight: 500;
    }
    .nav-link:hover {
      color: var(--cyber-cyan);
    }
    /* Hero 背景 */
    .hero-section {
      background-image: url('/assets/images/backpic/hero-bg.webp');
      background-size: cover;
      background-position: center;
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,17,40,0.85) 0%, rgba(26,35,64,0.7) 100%);
    }
    /* 板块标题装饰 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 0.5rem;
    }
    .title-underline {
      width: 60px;
      height: 4px;
      background: var(--cyber-cyan);
      margin: 0.5rem auto 2.5rem;
      border-radius: 2px;
      box-shadow: 0 0 12px var(--cyber-cyan);
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(0,229,255,0.1);
      padding: 1.25rem 0;
    }
    .faq-question {
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: white;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      color: var(--text-secondary);
      font-size: 0.95rem;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 1rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 响应式调整 */
    @media (max-width: 768px) {
      .section-title {
        font-size: 1.75rem;
      }
      .hero-title {
        font-size: 2.2rem !important;
      }
      .glass-card {
        padding: 1.5rem;
      }
    }
    #mobile-menu {
      display: none;
    }
    .mobile-nav-open #mobile-menu {
      display: flex;
    }