/* roulang page: index */
:root {
      --deep-brown: #3E2C1F;
      --charcoal: #1E1E1E;
      --champagne: #C9A96E;
      --copper: #B87333;
      --warm-white: #FAF7F2;
      --soft-gray: #6B6B6B;
      --dark-text: #2B2B2B;
      --border-light: #E0D9D0;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: #FFFFFF;
      color: var(--dark-text);
      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 ease, background-color 0.2s ease;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 768px) {
      .container {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    .serif {
      font-family: 'Noto Serif SC', 'STSong', 'Songti SC', serif;
    }
    .sans {
      font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }
    .nav-link {
      position: relative;
      font-weight: 500;
      color: #4A4A4A;
      letter-spacing: 0.3px;
      transition: color 0.2s;
    }
    .nav-link:hover {
      color: var(--champagne);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background-color: var(--champagne);
      transition: width 0.25s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .card {
      background-color: #FFFFFF;
      border-radius: 12px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.06);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      padding: 2rem;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 30px rgba(0,0,0,0.12);
    }
    .btn-primary {
      background-color: var(--champagne);
      color: white;
      font-weight: 600;
      padding: 0.75rem 1.75rem;
      border-radius: 8px;
      display: inline-block;
      transition: background-color 0.25s, box-shadow 0.25s;
      box-shadow: 0 4px 12px rgba(201,169,110,0.25);
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      background-color: var(--copper);
      box-shadow: 0 6px 18px rgba(184,115,51,0.35);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--champagne);
      color: var(--champagne);
      font-weight: 600;
      padding: 0.75rem 1.75rem;
      border-radius: 8px;
      display: inline-block;
      transition: all 0.25s;
      letter-spacing: 0.5px;
    }
    .btn-outline:hover {
      background-color: rgba(201,169,110,0.08);
      border-color: var(--copper);
      color: var(--copper);
    }
    .hero-title {
      font-family: 'Noto Serif SC', 'STSong', 'Songti SC', serif;
      font-weight: 700;
    }
    .accent-line {
      width: 60px;
      height: 3px;
      background-color: var(--champagne);
      margin: 1rem 0 1.5rem;
    }
    .faq-item {
      border-bottom: 1px solid #E8E2D9;
    }
    .faq-question {
      cursor: pointer;
      padding: 1.25rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.125rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 0;
      color: #4A4A4A;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.25rem;
    }
    .faq-icon {
      transition: transform 0.3s ease;
      font-size: 1.2rem;
      color: var(--champagne);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    @media (max-width: 768px) {
      .hero-title {
        font-size: 2.4rem !important;
      }
      .mobile-hidden {
        display: none;
      }
    }