/* roulang page: index */
:root {
      --deep-blue: #0A0E27;
      --card-bg: #0F1535;
      --primary-glow: #3B82F6;
      --secondary-glow: #60A5FA;
      --deep-accent: #1E40AF;
      --cta-amber: #F59E0B;
      --text-primary: #FFFFFF;
      --text-secondary: #CBD5E1;
      --text-muted: #94A3B8;
      --border-glow: rgba(59, 130, 246, 0.25);
      --glass-bg: rgba(15, 21, 53, 0.6);
      --glass-border: 1px solid rgba(59, 130, 246, 0.25);
      --card-radius: 20px;
      --btn-radius: 12px;
      --blur-amount: 16px;
      --shadow-glass: 0 8px 32px rgba(0,0,0,0.4), 0 0 0 1px rgba(59,130,246,0.15);
      --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Inter', 'Noto Sans SC', system-ui, sans-serif;
      background-color: var(--deep-blue);
      color: var(--text-secondary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(var(--blur-amount));
      -webkit-backdrop-filter: blur(var(--blur-amount));
      border: var(--glass-border);
      border-radius: var(--card-radius);
      box-shadow: var(--shadow-glass);
      transition: var(--transition-smooth);
    }
    .glass-card:hover {
      border-color: rgba(59, 130, 246, 0.5);
      box-shadow: 0 12px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(59,130,246,0.4);
      transform: scale(1.02);
    }
    /* 发光按钮主样式 */
    .btn-primary {
      background: linear-gradient(135deg, #3B82F6, #1E40AF);
      border: none;
      color: white;
      font-weight: 600;
      border-radius: var(--btn-radius);
      padding: 14px 32px;
      font-size: 16px;
      box-shadow: 0 0 20px rgba(59,130,246,0.5);
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 35px rgba(59,130,246,0.8);
      transform: translateY(-2px);
      background: linear-gradient(135deg, #60A5FA, #2563EB);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid #3B82F6;
      color: #3B82F6;
      font-weight: 600;
      border-radius: var(--btn-radius);
      padding: 14px 32px;
      font-size: 16px;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
      backdrop-filter: blur(4px);
    }
    .btn-outline:hover {
      background: rgba(59,130,246,0.1);
      border-color: #60A5FA;
      color: #60A5FA;
      transform: translateY(-2px);
    }
    /* 导航 */
    .glass-nav {
      background: rgba(10,14,39,0.4);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid rgba(59,130,246,0.2);
      transition: all 0.4s ease;
    }
    .nav-scrolled {
      background: rgba(10,14,39,0.95) !important;
      backdrop-filter: blur(20px);
      box-shadow: 0 2px 20px rgba(0,0,0,0.6);
    }
    .nav-link {
      color: #94A3B8;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover {
      color: #FFFFFF;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: #3B82F6;
      box-shadow: 0 0 8px #3B82F6;
      transition: width 0.3s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    /* 移动端菜单 */
    .mobile-menu {
      background: rgba(10,14,39,0.98);
      backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(59,130,246,0.3);
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(59,130,246,0.2);
      transition: all 0.3s;
    }
    .faq-question {
      cursor: pointer;
      padding: 20px 0;
      font-weight: 600;
      font-size: 22px;
      color: #FFFFFF;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease;
      color: #94A3B8;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-bottom: 20px;
    }
    .faq-item.active .faq-indicator {
      background: #3B82F6;
      box-shadow: 0 0 12px #3B82F6;
    }
    .faq-indicator {
      width: 3px;
      height: 100%;
      background: transparent;
      transition: 0.3s;
      margin-right: 16px;
    }
    /* 自定义动画 */
    @keyframes float {
      0% { transform: translateY(0px); }
      50% { transform: translateY(-8px); }
      100% { transform: translateY(0px); }
    }
    .floating-element {
      animation: float 4s ease-in-out infinite;
    }
    /* 响应式调整 */
    @media (max-width: 1024px) {
      h1 { font-size: 42px !important; }
      h2 { font-size: 32px !important; }
    }
    @media (max-width: 768px) {
      h1 { font-size: 36px !important; line-height: 1.2 !important; }
      h2 { font-size: 28px !important; }
      .section-padding { padding: 60px 0 !important; }
      .grid-cols-3, .grid-cols-2 { grid-template-columns: 1fr !important; }
      .hero-text { text-align: center; }
      .hero-buttons { justify-content: center; }
    }
    section {
      padding: 100px 0;
    }
    .section-padding {
      padding: 100px 0;
    }