/* roulang page: index */
:root {
      --primary: #8A4FFF;
      --primary-glow: #7B2FFF;
      --accent: #C4FF0E;
      --accent-dim: rgba(196, 255, 14, 0.18);
      --bg-deep: #0B0E14;
      --bg-card: rgba(20, 26, 36, 0.55);
      --bg-card-hover: rgba(26, 32, 44, 0.7);
      --border-light: rgba(255, 255, 255, 0.12);
      --border-hover: rgba(255, 255, 255, 0.25);
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8C5;
      --text-muted: #7a8290;
      --radius-lg: 24px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --shadow-card: 0 10px 30px -10px rgba(0,0,0,0.45);
      --shadow-glow: 0 0 25px rgba(196, 255, 14, 0.55);
      --shadow-purple: 0 0 30px rgba(138, 79, 255, 0.4);
      --transition: 0.25s ease-in-out;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-deep);
    }

    body {
      font-family: var(--font-sans);
      background: var(--bg-deep);
      color: var(--text-primary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 玻璃拟态卡片通用类 */
    .glass-card {
      background: var(--bg-card);
      backdrop-filter: blur(20px) saturate(180%);
      -webkit-backdrop-filter: blur(20px) saturate(180%);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: border-color var(--transition), box-shadow var(--transition), background var(--transition), transform var(--transition);
    }
    .glass-card:hover {
      border-color: var(--border-hover);
      box-shadow: 0 20px 40px -12px rgba(123, 47, 255, 0.35), var(--shadow-card);
      background: var(--bg-card-hover);
      transform: translateY(-4px);
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      font-size: 15px;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      border-radius: var(--radius-sm);
      padding: 14px 32px;
      cursor: pointer;
      transition: all 0.25s ease;
      text-decoration: none;
      border: 1px solid transparent;
      line-height: 1.2;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--accent);
      color: #0B0E14;
      border-color: var(--accent);
      box-shadow: 0 0 20px rgba(196, 255, 14, 0.45);
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px var(--accent), 0 10px 20px rgba(0,0,0,0.3);
      transform: translateY(-2px);
      background: #d6ff3a;
    }
    .btn-ghost {
      background: transparent;
      border-color: var(--accent);
      color: var(--accent);
    }
    .btn-ghost:hover {
      background: var(--accent-dim);
      border-color: var(--accent);
      color: var(--accent);
      box-shadow: 0 0 18px rgba(196,255,14,0.3);
    }
    .btn-lg {
      padding: 18px 42px;
      font-size: 17px;
      border-radius: 14px;
    }

    /* 排版 */
    h1 {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -1.5px;
      background: linear-gradient(180deg, #FFFFFF 0%, #d9c5ff 80%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    h2 {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.5px;
    }
    h3 {
      font-size: 24px;
      font-weight: 600;
    }
    .text-body {
      font-size: 16px;
      font-weight: 400;
      line-height: 1.7;
      color: var(--text-secondary);
    }
    .section-padding {
      padding: 120px 0;
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      transition: background 0.3s, backdrop-filter 0.3s, box-shadow 0.3s;
      padding: 16px 0;
    }
    .site-header.scrolled {
      background: rgba(11, 14, 20, 0.8);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.4);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .logo {
      font-size: 28px;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-primary);
      text-decoration: none;
      background: linear-gradient(135deg, #fff 0%, #c9a9ff 90%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
    }
    .nav-tabs {
      display: flex;
      gap: 8px;
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(10px);
      border-radius: 40px;
      padding: 6px;
      border: 1px solid rgba(255,255,255,0.08);
    }
    .nav-tab {
      padding: 10px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 14px;
      color: var(--text-secondary);
      text-decoration: none;
      transition: all 0.2s;
      letter-spacing: 0.3px;
    }
    .nav-tab.active {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 12px rgba(123,47,255,0.5);
    }
    .nav-tab:hover:not(.active) {
      background: rgba(255,255,255,0.08);
      color: white;
    }
    .header-cta {
      display: flex;
      align-items: center;
    }

    /* Hero 区域 */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      isolation: isolate;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(138,79,255,0.25) 0%, transparent 60%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
    }
    .hero-badge {
      display: inline-block;
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      padding: 8px 18px;
      border-radius: 30px;
      font-size: 14px;
      color: var(--accent);
      border: 1px solid rgba(196,255,14,0.25);
      margin-bottom: 24px;
    }

    /* 卡片布局 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .asymmetric-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.9fr 1.1fr;
      gap: 28px;
    }

    /* 数据面板 */
    .stats-panel {
      background: linear-gradient(135deg, #0f1420 0%, #0B0E14 100%);
      border-radius: 32px;
      padding: 48px 32px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      border: 1px solid rgba(255,255,255,0.1);
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
      text-shadow: 0 0 18px var(--accent-dim);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }

    /* 页脚 */
    .footer {
      background: #090c12;
      border-top: 1px solid rgba(255,255,255,0.05);
      padding: 64px 0 32px;
      color: var(--text-muted);
    }

    /* 移动端菜单按钮 */
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 24px;
    }

    @media (max-width: 1024px) {
      h1 { font-size: 42px; }
      h2 { font-size: 32px; }
      .grid-3, .asymmetric-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .section-padding { padding: 80px 0; }
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
      .grid-2, .grid-3, .asymmetric-grid { grid-template-columns: 1fr; }
      .nav-tabs { display: none; }
      .mobile-toggle { display: block; }
      .header-cta .btn { padding: 10px 20px; font-size: 13px; }
      .stats-panel { flex-direction: column; align-items: center; gap: 28px; }
    }