/* roulang page: index */
/* ===== 设计变量与全局重置 ===== */
    :root {
      --bg-deep: #0A0E1A;
      --bg-card: rgba(255, 255, 255, 0.03);
      --border-subtle: rgba(255, 255, 255, 0.08);
      --border-glow: rgba(74, 58, 255, 0.5);
      --primary: #4A3AFF;
      --primary-glow: rgba(74, 58, 255, 0.6);
      --accent-neon: #00F0C8;
      --accent-gold: #F5B642;
      --text-primary: #FFFFFF;
      --text-secondary: #D1D5DB;
      --text-muted: #9CA3AF;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-glow: 0 0 24px rgba(74, 58, 255, 0.3);
      --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-deep);
      color: var(--text-secondary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      background-image: linear-gradient(180deg, #0A0E1A 0%, #0F1423 100%);
      background-attachment: fixed;
    }

    /* 细微网格纹理 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: 0;
    }

    .content-wrapper {
      position: relative;
      z-index: 1;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a, button {
      font-family: inherit;
      cursor: pointer;
      transition: all 0.25s ease;
    }

    /* 玻璃拟态卡片基类 */
    .glass-card {
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 12px 40px rgba(0,0,0,0.5), 0 0 28px rgba(74, 58, 255, 0.3);
      border-color: rgba(74, 58, 255, 0.25);
    }

    /* 发光按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-md);
      padding: 0.875rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 20px rgba(74, 58, 255, 0.5), inset 0 1px 0 rgba(255,255,255,0.2);
      border: none;
      letter-spacing: 0.5px;
      transition: all 0.25s ease;
    }

    .btn-primary:hover {
      background: #5B4BFF;
      box-shadow: 0 0 32px rgba(74, 58, 255, 0.75), inset 0 1px 0 rgba(255,255,255,0.3);
      transform: scale(1.02);
      color: white;
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--accent-neon);
      color: var(--accent-neon);
      font-weight: 600;
      border-radius: var(--radius-md);
      padding: 0.875rem 2rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.25s ease;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 200, 0.08);
      border-color: #00FFD5;
      color: #00FFD5;
      transform: translateY(-2px);
    }

    /* 导航样式 */
    .nav-blur {
      background: rgba(10, 14, 26, 0.7);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      transition: background 0.3s ease, border-color 0.3s ease;
    }

    .nav-scrolled {
      background: rgba(10, 14, 26, 0.96);
      border-bottom: 1px solid rgba(74, 58, 255, 0.25);
      box-shadow: 0 4px 20px rgba(0,0,0,0.6);
    }

    .nav-link {
      color: #D1D5DB;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
    }

    .nav-link:hover {
      color: var(--accent-neon);
    }

    /* 区块标题装饰 */
    .section-badge {
      display: inline-block;
      background: rgba(74, 58, 255, 0.15);
      color: #A78BFA;
      border-radius: 20px;
      padding: 0.25rem 1rem;
      font-size: 0.85rem;
      font-weight: 500;
      letter-spacing: 0.5px;
      margin-bottom: 0.75rem;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .faq-question {
      cursor: pointer;
      color: white;
      font-weight: 500;
      transition: color 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.3s ease;
      color: #D1D5DB;
    }
    .faq-item.active .faq-question {
      color: var(--accent-neon);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1rem;
    }

    /* 渐变文字 */
    .text-gradient {
      background: linear-gradient(135deg, #FFFFFF 0%, #A5B4FC 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 移动端汉堡菜单 */
    @media (max-width: 767px) {
      .mobile-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(10,14,26,0.98);
        backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(255,255,255,0.1);
        flex-direction: column;
        padding: 1.5rem;
      }
      .mobile-menu.open {
        display: flex;
      }
    }