/* roulang page: index */
:root {
      --primary: #0F5BFF;
      --primary-hover: #0A4AD6;
      --accent: #FF6B2B;
      --accent-hover: #E55A1C;
      --dark-bg: #1E1F24;
      --light-bg: #F7F8FC;
      --card-bg: #FFFFFF;
      --text-main: #2C2D33;
      --text-muted: #6B6D76;
      --border-light: rgba(0,0,0,0.05);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-md: 12px;
      --radius-btn: 8px;
      --transition-smooth: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      color: var(--text-main);
      background-color: #fff;
      line-height: 1.7;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 768px) {
      .container-custom {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    /* 导航样式 */
    .nav-blur {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
      padding: 0.25rem 0;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background: var(--primary);
      transition: transform 0.2s ease;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link:hover::after {
      transform: translateX(-50%) scaleX(1);
    }
    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
      display: inline-block;
      text-align: center;
      box-shadow: 0 2px 8px rgba(15,91,255,0.2);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 4px 14px rgba(15,91,255,0.3);
    }
    .btn-primary:active {
      transform: scale(0.97);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 0.7rem 1.9rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background: rgba(15,91,255,0.08);
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.85rem 2.5rem;
      font-weight: 700;
      border: none;
      cursor: pointer;
      transition: background 0.2s, transform 0.1s;
      box-shadow: 0 4px 12px rgba(255,107,43,0.25);
    }
    .btn-accent:hover {
      background: var(--accent-hover);
    }
    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      padding: 2rem;
      height: 100%;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    /* 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      padding: 1.25rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--text-main);
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 1rem 0 0;
      color: var(--text-muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.25rem;
    }
    .faq-icon {
      font-size: 1.5rem;
      font-weight: 400;
      color: var(--accent);
      transition: transform 0.2s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    /* 计数动画简单样式 */
    .count-num {
      font-variant-numeric: tabular-nums;
    }
    /* 桌面mega菜单 */
    .mega-panel {
      position: absolute;
      top: 100%;
      right: 0;
      background: white;
      border-radius: 12px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.1);
      padding: 1.25rem;
      min-width: 260px;
      opacity: 0;
      visibility: hidden;
      transform: translateY(8px);
      transition: 0.2s ease;
      z-index: 50;
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }
    .mega-trigger:hover .mega-panel,
    .mega-trigger:focus-within .mega-panel {
      opacity: 1;
      visibility: visible;
      transform: translateY(0);
    }
    .mega-card {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 0.6rem 0.8rem;
      border-radius: 8px;
      transition: background 0.2s;
    }
    .mega-card:hover {
      background: #F7F8FC;
    }
    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      box-shadow: 0 12px 24px rgba(0,0,0,0.08);
      padding: 1rem 1.5rem;
    }
    #menu-toggle:checked ~ .mobile-menu {
      display: flex;
    }
    @media (max-width: 767px) {
      .desktop-nav {
        display: none;
      }
      .mobile-nav-trigger {
        display: flex;
      }
    }
    @media (min-width: 768px) {
      .mobile-nav-trigger, .mobile-menu {
        display: none;
      }
      .desktop-nav {
        display: flex;
      }
    }