/* roulang page: index */
:root {
      --primary: #1A1A2E;
      --accent1: #E94E77;
      --accent2: #F9A826;
      --bg: #FAFAFA;
      --card: #FFFFFF;
      --text: #2D2D2D;
      --muted: #6B6B6B;
      --border: #E5E5E5;
      --radius-lg: 16px;
      --radius-sm: 10px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 32px;
      z-index: 50;
      transition: background 0.3s ease, backdrop-filter 0.3s ease;
      background: transparent;
    }
    .navbar.scrolled {
      background: rgba(26,26,46,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }
    .nav-logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 20px;
      color: white;
      letter-spacing: 0.5px;
    }
    .nav-logo svg {
      width: 28px;
      height: 28px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      font-size: 14px;
      font-weight: 500;
      color: rgba(255,255,255,0.85);
    }
    .nav-links a {
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover {
      color: #E94E77;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: #E94E77;
      transition: width 0.25s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn-pill {
      background: #F9A826;
      color: white;
      padding: 8px 20px;
      border-radius: 24px;
      font-weight: 600;
      font-size: 14px;
      transition: filter 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-pill:hover {
      filter: brightness(1.1);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 28px;
      cursor: pointer;
    }
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: #1A1A2E;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 55;
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .mobile-menu a {
      color: white;
      font-size: 22px;
      font-weight: 600;
    }
    /* 按钮体系 */
    .btn-primary {
      background: #E94E77;
      color: white;
      padding: 14px 32px;
      border-radius: 10px;
      font-weight: 600;
      display: inline-block;
      transition: background 0.25s, transform 0.25s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #D43F65;
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid #1A1A2E;
      color: #1A1A2E;
      padding: 12px 30px;
      border-radius: 10px;
      font-weight: 600;
      display: inline-block;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: #1A1A2E;
      color: white;
    }
    .btn-outline-white {
      border: 2px solid white;
      color: white;
      background: transparent;
      padding: 14px 36px;
      border-radius: 10px;
      font-weight: 600;
      transition: all 0.25s;
    }
    .btn-outline-white:hover {
      background: white;
      color: #E94E77;
    }
    .link-underline {
      position: relative;
      font-weight: 500;
      color: #E94E77;
    }
    .link-underline::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 1.5px;
      background: #E94E77;
      transition: width 0.3s;
    }
    .link-underline:hover::after {
      width: 100%;
    }
    /* 动画 */
    .fade-up {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    }
    .fade-up.visible {
      opacity: 1;
      transform: translateY(0);
    }
    @keyframes countUp {
      from { opacity: 0; transform: translateY(10px); }
      to { opacity: 1; transform: translateY(0); }
    }
    .count-animate {
      animation: countUp 0.8s ease-out forwards;
    }
    /* 卡片 */
    .card {
      background: white;
      border-radius: 16px;
      border: 1px solid #E5E5E5;
      box-shadow: 0 4px 20px rgba(26,26,46,0.06);
      transition: all 0.3s;
    }
    .card:hover {
      box-shadow: 0 12px 32px rgba(26,26,46,0.12);
      transform: translateY(-4px);
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #E5E5E5;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #6B6B6B;
      font-size: 16px;
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    .faq-icon {
      transition: transform 0.3s;
      color: #E94E77;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    @media (max-width: 768px) {
      .nav-links, .nav-actions .search-icon, .nav-actions .login-btn {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .navbar {
        padding: 0 20px;
      }
      h1 {
        font-size: 36px !important;
      }
      h2 {
        font-size: 28px !important;
      }
      .grid-asymmetric {
        grid-template-columns: 1fr !important;
      }
      .faq-grid {
        grid-template-columns: 1fr !important;
      }
    }