/* roulang page: index */
:root {
      --primary: #E63946;
      --secondary: #1D3557;
      --accent: #F4A261;
      --bg: #F8F9FA;
      --card-bg: #FFFFFF;
      --text-dark: #1D3557;
      --text-muted: #6C757D;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.10);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-family: var(--font-sans);
      background-color: var(--bg);
    }
    body {
      font-family: var(--font-sans);
      color: var(--text-dark);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 1024px) {
      .container-custom {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    /* 按钮重置 */
    .btn-primary {
      background-color: var(--primary);
      color: white;
      border-radius: var(--radius-md);
      padding: 14px 32px;
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 10px rgba(230,57,70,0.2);
    }
    .btn-primary:hover {
      background-color: #C1121F;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(230,57,70,0.25);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
      border-radius: var(--radius-md);
      padding: 12px 30px;
      font-weight: 600;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      cursor: pointer;
    }
    .btn-outline:hover {
      background-color: var(--secondary);
      color: white;
    }
    .btn-cta {
      background: linear-gradient(135deg, #E63946 0%, #F4A261 100%);
      color: white;
      border-radius: 30px;
      padding: 16px 40px;
      font-weight: 700;
      font-size: 1.1rem;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
      box-shadow: 0 8px 20px rgba(230,57,70,0.3);
    }
    .btn-cta:hover {
      filter: brightness(1.1);
      transform: scale(1.03);
      box-shadow: 0 12px 28px rgba(230,57,70,0.4);
    }
    /* 卡片 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
      transition: all 0.2s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    /* 导航下划线 */
    .nav-active {
      position: relative;
      color: var(--primary) !important;
    }
    .nav-active::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 100%;
      height: 3px;
      background-color: var(--primary);
      border-radius: 3px;
    }
    /* 瀑布流 */
    .masonry {
      columns: 3;
      column-gap: 20px;
    }
    @media (max-width: 1024px) {
      .masonry {
        columns: 2;
      }
    }
    @media (max-width: 768px) {
      .masonry {
        columns: 1;
      }
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 20px;
    }
    /* 手风琴 */
    details.faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      box-shadow: var(--shadow-card);
      transition: all 0.2s;
    }
    details.faq-item[open] {
      box-shadow: var(--shadow-hover);
    }
    details.faq-item summary {
      list-style: none;
      padding: 18px 20px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--text-dark);
    }
    details.faq-item summary::-webkit-details-marker {
      display: none;
    }
    .faq-answer {
      padding: 0 20px 20px 20px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
    }
    /* 深色区块 */
    .dark-block {
      background-color: var(--secondary);
      color: white;
    }
    /* 移动端汉堡菜单 */
    .mobile-menu {
      transition: transform 0.3s ease;
      transform: translateX(100%);
      position: fixed;
      top: 0;
      right: 0;
      height: 100vh;
      width: 75%;
      max-width: 320px;
      background: white;
      z-index: 100;
      box-shadow: -5px 0 25px rgba(0,0,0,0.15);
      padding: 24px;
    }
    .mobile-menu.open {
      transform: translateX(0);
    }
    .overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.4);
      z-index: 99;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s;
    }
    .overlay.show {
      opacity: 1;
      pointer-events: auto;
    }