/* roulang page: index */
:root {
      --primary: #1B3A2D;
      --primary-deep: #0F261B;
      --accent: #C8A96E;
      --bg-warm: #FAF7F2;
      --text-body: #3A3A3A;
      --text-weak: #6B6B6B;
      --white: #FFFFFF;
      --border-light: #EAE5DA;
      --shadow-card: 0 4px 20px rgba(27, 58, 45, 0.06);
      --shadow-card-hover: 0 8px 30px rgba(27, 58, 45, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
    }

    * {
      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: 1.7;
      font-size: 16px;
      -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, input, textarea {
      font-family: inherit;
    }

    .container-main {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    h1 {
      font-size: 42px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      line-height: 1.2;
    }

    h2 {
      font-size: 30px;
      font-weight: 600;
      color: var(--primary);
      position: relative;
      display: inline-block;
      margin-bottom: 2rem;
    }

    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 48px;
      height: 4px;
      background-color: var(--accent);
      border-radius: 2px;
    }

    .text-accent-gold {
      color: var(--accent);
    }

    .bg-primary {
      background-color: var(--primary);
    }

    .bg-primary-deep {
      background-color: var(--primary-deep);
    }

    .bg-warm {
      background-color: var(--bg-warm);
    }

    .border-light {
      border-color: var(--border-light);
    }

    .btn-primary {
      background-color: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.5rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.2s, transform 0.2s;
      border: none;
      cursor: pointer;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background-color: #153026;
      transform: scale(1.05);
    }

    .btn-outline-gold {
      border: 1px solid var(--accent);
      color: var(--accent);
      background: transparent;
      border-radius: var(--radius-btn);
      padding: 0.65rem 1.5rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: background-color 0.2s, transform 0.2s;
    }

    .btn-outline-gold:hover {
      background-color: rgba(200, 169, 110, 0.1);
      transform: scale(1.03);
    }

    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: box-shadow 0.25s ease, transform 0.25s ease;
    }

    .card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-2px);
    }

    .top-bar {
      height: 36px;
      background-color: var(--primary);
      color: white;
      font-size: 12px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 1.5rem;
    }

    .nav-link {
      font-weight: 500;
      color: var(--primary);
      position: relative;
      transition: color 0.2s;
      padding: 0.5rem 0;
    }

    .nav-link:hover {
      color: var(--accent);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%) scaleX(0);
      width: 100%;
      height: 2px;
      background-color: var(--accent);
      transition: transform 0.25s ease;
    }

    .nav-link:hover::after {
      transform: translateX(-50%) scaleX(1);
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }

    .faq-question {
      cursor: pointer;
      font-weight: 600;
      font-size: 16px;
      padding: 1.25rem 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background-color: var(--bg-warm);
      padding-left: 1rem;
      border-left: 4px solid var(--accent);
      margin-bottom: 0.5rem;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 1rem 1rem 1rem 1.5rem;
    }

    .faq-item.active .faq-icon {
      transform: rotate(180deg);
    }

    .faq-icon {
      transition: transform 0.3s ease;
      color: var(--accent);
    }

    @media (max-width: 768px) {
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 26px;
      }
      .container-main {
        padding-left: 1rem;
        padding-right: 1rem;
      }
      .hero-image {
        margin-top: 2rem;
      }
    }

    @media (max-width: 520px) {
      h1 {
        font-size: 28px;
      }
    }