/* roulang page: index */
@import url('/assets/css/vendor/1ecd1de215-css2.css');
    :root {
      --primary-black: #1A1A1A;
      --accent-red: #E63E2E;
      --bg-warm: #FAFAFA;
      --card-white: #FFFFFF;
      --border-light: #E5E5E5;
      --text-body: #4A4A4A;
      --text-muted: #8A8A8A;
      --text-footer: #B0B0B0;
      --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 6px 16px rgba(0,0,0,0.04);
      --shadow-card-hover: 0 4px 10px rgba(0,0,0,0.06), 0 12px 24px rgba(0,0,0,0.06);
      --nav-width: 72px;
      --content-max: 1280px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      display: flex;
      min-height: 100vh;
    }
    img {
      max-width: 100%;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all 0.25s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      outline: none;
    }
    /* 左侧导航桌面版 */
    .app-nav {
      position: fixed;
      left: 0;
      top: 0;
      width: var(--nav-width);
      height: 100vh;
      background-color: #FAFAFA;
      border-right: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 24px 0;
      z-index: 40;
      box-shadow: 0 0 12px rgba(0,0,0,0.02);
    }
    .nav-logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-black);
      margin-bottom: 40px;
      letter-spacing: 1px;
      writing-mode: horizontal-tb;
      text-align: center;
    }
    .nav-menu {
      display: flex;
      flex-direction: column;
      gap: 20px;
      align-items: center;
      list-style: none;
      width: 100%;
    }
    .nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-size: 12px;
      color: var(--text-muted);
      position: relative;
      width: 100%;
      padding: 8px 0;
      transition: color 0.2s;
      font-weight: 500;
    }
    .nav-item i {
      font-size: 20px;
      margin-bottom: 4px;
    }
    .nav-item.active {
      color: var(--accent-red);
      font-weight: 600;
    }
    .nav-item.active::before {
      content: '';
      position: absolute;
      left: 0;
      top: 8px;
      bottom: 8px;
      width: 3px;
      background-color: var(--accent-red);
      border-radius: 0 2px 2px 0;
    }
    .nav-item:hover {
      color: var(--primary-black);
    }
    /* 主要内容区域 */
    .main-content {
      margin-left: var(--nav-width);
      width: calc(100% - var(--nav-width));
      max-width: 100%;
    }
    .container-custom {
      max-width: var(--content-max);
      margin: 0 auto;
      padding-left: 48px;
      padding-right: 48px;
    }
    /* 移动端导航 */
    .mobile-nav {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: 56px;
      background: #FAFAFA;
      border-bottom: 1px solid var(--border-light);
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      z-index: 50;
    }
    .hamburger {
      font-size: 24px;
      color: var(--primary-black);
      background: none;
      border: none;
    }
    .mobile-drawer {
      position: fixed;
      top: 56px;
      left: 0;
      width: 100%;
      background: #FAFAFA;
      border-bottom: 1px solid var(--border-light);
      flex-direction: column;
      padding: 16px 20px;
      gap: 12px;
      display: none;
      z-index: 49;
      box-shadow: 0 10px 15px rgba(0,0,0,0.05);
    }
    .mobile-drawer a {
      font-size: 16px;
      font-weight: 500;
      color: var(--text-body);
      padding: 8px 0;
      border-bottom: 1px solid #f0f0f0;
    }
    .mobile-drawer a.active {
      color: var(--accent-red);
      font-weight: 600;
    }
    /* 通用组件 */
    .btn-primary {
      background-color: var(--accent-red);
      color: white;
      border-radius: 8px;
      padding: 14px 32px;
      font-weight: 600;
      font-size: 16px;
      letter-spacing: 0.3px;
      box-shadow: 0 2px 6px rgba(230,62,46,0.25);
    }
    .btn-primary:hover {
      filter: brightness(0.9);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary-black);
      color: var(--primary-black);
      border-radius: 8px;
      padding: 14px 32px;
      font-weight: 600;
      font-size: 16px;
    }
    .btn-outline:hover {
      background: var(--primary-black);
      color: white;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      color: var(--primary-black);
      letter-spacing: -0.5px;
    }
    .card {
      background: var(--card-white);
      border: 1px solid var(--border-light);
      border-radius: 12px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-4px);
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      font-weight: 600;
      font-size: 16px;
      color: var(--primary-black);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 0;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.2s;
      color: var(--text-body);
      font-size: 15px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--accent-red);
    }
    .faq-icon {
      transition: transform 0.25s ease;
      font-size: 20px;
      color: var(--text-muted);
    }
    @media (max-width: 768px) {
      .app-nav {
        display: none;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
      }
      .mobile-nav {
        display: flex;
      }
      .container-custom {
        padding-left: 20px;
        padding-right: 20px;
      }
      .section-title {
        font-size: 28px;
      }
    }