/* roulang page: index */
:root {
      --primary: #1A1A2E;
      --accent: #E85D04;
      --accent-hover: #D14D00;
      --bg: #F8F9FA;
      --card-bg: #FFFFFF;
      --text: #1A1A2E;
      --text-soft: rgba(26, 26, 46, 0.7);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 10px 25px -5px rgba(0,0,0,0.08), 0 4px 10px -2px rgba(0,0,0,0.05);
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: #F8F9FA;
      color: #1A1A2E;
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    .font-mono {
      font-family: 'Inter', 'SF Pro Display', system-ui, sans-serif;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 1024px) {
      .container {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    /* 导航卡片效果 */
    .nav-glass {
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border: 1px solid rgba(0,0,0,0.04);
      border-radius: 16px;
      box-shadow: var(--shadow-card);
    }
    .nav-link {
      color: rgba(26,26,46,0.7);
      font-weight: 500;
      font-size: 0.9375rem;
      transition: color 0.2s ease;
    }
    .nav-link:hover {
      color: #E85D04;
    }
    /* 按钮系统 */
    .btn-primary {
      background-color: #E85D04;
      color: white;
      border-radius: 8px;
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      font-size: 0.95rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.2s ease, transform 0.1s;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-primary:hover {
      background-color: #D14D00;
    }
    .btn-secondary {
      background: transparent;
      color: #1A1A2E;
      border: 1.5px solid #1A1A2E;
      border-radius: 8px;
      padding: 0.7rem 1.8rem;
      font-weight: 600;
      font-size: 0.95rem;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.2s, color 0.2s;
      text-decoration: none;
    }
    .btn-secondary:hover {
      background-color: rgba(26,26,46,0.08);
    }
    /* 卡片hover */
    .card-hover {
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    /* FAQ 手风琴 */
    .faq-item {
      border-radius: 12px;
      background: white;
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      margin-bottom: 1rem;
      transition: box-shadow 0.25s;
    }
    .faq-question {
      cursor: pointer;
      padding: 1.2rem 1.8rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
      color: #1A1A2E;
    }
    .faq-icon {
      font-size: 1.8rem;
      font-weight: 300;
      color: #E85D04;
      transition: transform 0.25s ease;
      line-height: 1;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.25s;
      padding: 0 1.8rem;
      color: rgba(26,26,46,0.8);
      font-size: 0.95rem;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.5rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-item.active {
      box-shadow: 0 10px 20px -5px rgba(0,0,0,0.08);
    }
    /* 对比区分割线手柄 */
    .comparison-handle {
      width: 28px;
      height: 28px;
      background: #E85D04;
      border-radius: 50%;
      box-shadow: 0 0 0 4px rgba(232,93,4,0.2);
      animation: handlePulse 2.2s infinite;
    }
    @keyframes handlePulse {
      0% { box-shadow: 0 0 0 0 rgba(232,93,4,0.3); }
      70% { box-shadow: 0 0 0 10px rgba(232,93,4,0); }
      100% { box-shadow: 0 0 0 0 rgba(232,93,4,0); }
    }
    /* 数字跳动 */
    @keyframes softPulse {
      0% { opacity: 1; }
      50% { opacity: 0.75; }
      100% { opacity: 1; }
    }
    .live-number {
      animation: softPulse 0.6s ease-in-out;
    }
    /* 移动端底部导航 */
    .mobile-bottom-nav {
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(12px);
      border-top: 1px solid rgba(0,0,0,0.05);
      border-radius: 0;
    }
    @media (max-width: 767px) {
      .desktop-nav {
        display: none !important;
      }
      .mobile-nav {
        display: flex;
      }
      .hero-right {
        margin-top: 2.5rem;
      }
    }
    @media (min-width: 768px) {
      .mobile-nav {
        display: none !important;
      }
    }