/* roulang page: index */
:root {
      --primary: #7C3AED;
      --accent: #06D6A0;
      --magenta: #F72585;
      --bg: #0B0A1A;
      --surface: #1A1530;
      --text-primary: #FFFFFF;
      --text-secondary: #B8B8D0;
      --text-muted: #7A7A9E;
      --border-light: rgba(255,255,255,0.06);
      --border-glow: rgba(124,58,237,0.2);
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-input: 10px;
      --radius-tag: 6px;
      --shadow-card: 0 8px 32px rgba(124,58,237,0.12), 0 2px 8px rgba(0,0,0,0.4);
      --shadow-btn: 0 0 20px rgba(124,58,237,0.3), 0 4px 12px rgba(0,0,0,0.5);
      --shadow-btn-hover: 0 0 40px rgba(6,214,160,0.5), 0 6px 16px rgba(0,0,0,0.6);
      --transition-smooth: 0.25s ease-out;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg);
      color: var(--text-secondary);
      line-height: 1.6;
      font-size: 16px;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
      position: relative;
      overflow-x: hidden;
    }

    /* 全局网格噪点背景 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: 
        linear-gradient(rgba(124,58,237,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(124,58,237,0.03) 1px, transparent 1px);
      background-size: 60px 60px;
      pointer-events: none;
      z-index: 0;
    }

    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
      position: relative;
      z-index: 2;
    }

    /* 导航 */
    .glass-nav {
      background: rgba(11, 10, 26, 0.7);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }

    .nav-link {
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover {
      color: #FFFFFF;
    }
    .nav-link.active {
      color: #FFFFFF;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--accent);
      border-radius: 1px;
    }

    .nav-separator {
      width: 1px;
      height: 14px;
      background: rgba(255,255,255,0.1);
      margin: 0 8px;
    }

    /* 汉堡菜单 */
    .hamburger-line {
      width: 24px;
      height: 2px;
      background: white;
      margin: 5px 0;
      transition: 0.3s;
    }
    .mobile-menu {
      background: rgba(11, 10, 26, 0.9);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
    }

    /* 标题样式 */
    h1, h2, h3, h4 {
      color: var(--text-primary);
      font-weight: 700;
      line-height: 1.15;
    }

    .gradient-text {
      background: linear-gradient(135deg, #7C3AED, #06D6A0);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    /* 玻璃卡片 */
    .glass-card {
      background: rgba(26, 21, 48, 0.65);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(124,58,237,0.2);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
    }
    .glass-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 16px 40px rgba(6,214,160,0.15), 0 4px 16px rgba(0,0,0,0.5);
      border-color: rgba(6,214,160,0.3);
    }

    /* 按钮 */
    .btn-primary {
      background: linear-gradient(135deg, #7C3AED, #06D6A0);
      color: white;
      font-weight: 700;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      box-shadow: var(--shadow-btn);
      transition: all var(--transition-smooth);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      box-shadow: var(--shadow-btn-hover);
      transform: scale(1.04);
    }

    .btn-ghost {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.2);
      color: white;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      transition: all var(--transition-smooth);
      display: inline-block;
      text-align: center;
    }
    .btn-ghost:hover {
      border-color: var(--accent);
      color: var(--accent);
    }

    .btn-giant {
      background: linear-gradient(135deg, #7C3AED, #06D6A0);
      color: white;
      font-weight: 700;
      font-size: 18px;
      border-radius: 14px;
      padding: 18px 48px;
      box-shadow: 0 0 30px rgba(124,58,237,0.5);
      transition: all 0.3s;
      display: inline-block;
      border: none;
      cursor: pointer;
    }
    .btn-giant:hover {
      box-shadow: 0 0 50px rgba(6,214,160,0.7);
      transform: scale(1.03);
    }

    /* 高亮数字 */
    .stat-number {
      font-family: 'Inter', 'SF Pro Display', sans-serif;
      font-weight: 800;
      color: var(--accent);
      font-size: 2rem;
      letter-spacing: 0.05em;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .faq-question {
      cursor: pointer;
      font-weight: 600;
      font-size: 18px;
      color: var(--text-primary);
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-secondary);
      font-size: 16px;
      padding-right: 20px;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-bottom: 20px;
    }
    .faq-icon {
      transition: transform 0.3s;
      font-size: 20px;
      color: var(--accent);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 响应式调整 */
    @media (max-width: 768px) {
      h1 {
        font-size: 48px !important;
      }
      h2 {
        font-size: 36px !important;
      }
    }