/* roulang page: index */
:root {
      --primary: #7B2FF7;
      --accent: #FF6B35;
      --bg: #0A0A0F;
      --surface: #14141F;
      --border: #2A2A3A;
      --text-primary: #F0E6FF;
      --text-secondary: #9B8AAF;
      --success: #00E676;
      --danger: #FF1744;
    }
    * {
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .font-number {
      font-family: "Inter", "SF Pro Display", system-ui, sans-serif;
    }
    /* 自定义过渡与动画 */
    .transition-card {
      transition: all 0.3s ease-out;
    }
    .card-hover:hover {
      border-color: var(--primary);
      box-shadow: 0 0 30px rgba(123, 47, 247, 0.3);
      transform: translateY(-4px);
    }
    .btn-primary {
      background: linear-gradient(135deg, #7B2FF7 0%, #FF6B35 100%);
      color: white;
      border-radius: 12px;
      padding: 0.9rem 2rem;
      font-weight: 700;
      box-shadow: 0 4px 15px rgba(123, 47, 247, 0.3);
      transition: all 0.3s ease;
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      filter: brightness(1.15);
      box-shadow: 0 6px 25px rgba(123, 47, 247, 0.5);
      transform: scale(1.05);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: 12px;
      padding: 0.85rem 1.8rem;
      font-weight: 700;
      transition: all 0.3s ease;
      display: inline-block;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(123, 47, 247, 0.1);
    }
    .btn-accent {
      background: linear-gradient(135deg, #FF6B35 0%, #FF8C5A 100%);
      color: white;
      border-radius: 12px;
      padding: 0.9rem 2.2rem;
      font-weight: 700;
      box-shadow: 0 0 20px rgba(255, 107, 53, 0.4);
      animation: pulse-glow 2s infinite;
      border: none;
      cursor: pointer;
      transition: all 0.3s ease;
    }
    .btn-accent:hover {
      box-shadow: 0 0 35px rgba(255, 107, 53, 0.7);
      transform: scale(1.05);
    }
    @keyframes pulse-glow {
      0% { box-shadow: 0 0 15px rgba(255, 107, 53, 0.4); }
      50% { box-shadow: 0 0 35px rgba(255, 107, 53, 0.7); }
      100% { box-shadow: 0 0 15px rgba(255, 107, 53, 0.4); }
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      padding-left: 1.2rem;
      border-left: 4px solid var(--primary);
      margin-bottom: 2.5rem;
    }
    @media (min-width: 1024px) {
      .section-title {
        font-size: 2.5rem;
      }
    }
    /* 导航滚动背景 */
    .navbar-scrolled {
      background: rgba(10, 10, 15, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
    }
    /* FAQ 动画 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease-in-out;
    }
    .faq-item.active .faq-content {
      max-height: 200px;
    }
    /* 数据条 */
    .progress-bar {
      height: 8px;
      border-radius: 4px;
      background: #2A2A3A;
      overflow: hidden;
    }
    .progress-fill-green {
      background: var(--success);
      height: 100%;
      width: 0%;
    }
    .progress-fill-red {
      background: var(--danger);
      height: 100%;
      width: 0%;
    }
    /* 汉堡菜单全屏 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 75%;
      max-width: 300px;
      height: 100vh;
      background: var(--surface);
      z-index: 100;
      transition: right 0.3s ease;
      padding: 2rem;
      display: flex;
      flex-direction: column;
      box-shadow: -5px 0 25px rgba(0,0,0,0.5);
    }
    .mobile-menu.open {
      right: 0;
    }
    .menu-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.6);
      z-index: 99;
      display: none;
    }
    .menu-overlay.show {
      display: block;
    }