/* roulang page: index */
:root {
      --gold: #C49A6C;
      --charcoal: #2B2B2B;
      --ivory: #F5F2ED;
      --emerald: #1F4E3D;
      --warm-white: #F0EDE6;
      --muted-text: #7A746E;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.08);
      --shadow-deep: 0 12px 32px rgba(0,0,0,0.12);
      --radius-card: 8px;
      --radius-btn: 6px;
      --font-serif: 'Noto Serif SC', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--charcoal);
      color: var(--warm-white);
      margin: 0;
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    @media (max-width: 768px) {
      .container-custom {
        padding-left: 16px;
        padding-right: 16px;
      }
    }
    /* 导航样式 */
    .nav-brand {
      font-family: var(--font-serif);
      font-weight: 600;
      color: var(--gold);
      letter-spacing: 0.05em;
      transition: color 0.2s;
    }
    .nav-link {
      color: var(--warm-white);
      transition: color 0.2s, border-color 0.2s;
      border-bottom: 2px solid transparent;
      font-size: 0.95rem;
    }
    .nav-link:hover {
      color: var(--gold);
      border-bottom-color: var(--gold);
    }
    .nav-cta-btn {
      background-color: var(--gold);
      color: #1a1a1a;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.5rem 1.25rem;
      transition: background-color 0.3s ease, color 0.3s ease;
      letter-spacing: 0.03em;
      font-size: 0.9rem;
    }
    .nav-cta-btn:hover {
      background-color: var(--emerald);
      color: white;
    }
    /* 汉堡菜单 */
    #mobile-menu {
      background-color: rgba(43,43,43,0.98);
      backdrop-filter: blur(4px);
    }
    /* Hero 图片滤镜 */
    .hero-image-wrapper img {
      filter: saturate(0.8) brightness(0.9);
      object-fit: cover;
      border-radius: 8px;
      border: 1px solid rgba(196,154,108,0.4);
    }
    /* 卡片样式 */
    .feature-card {
      background-color: rgba(43,43,43,0.7);
      border: 1px solid var(--gold);
      border-radius: var(--radius-card);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      box-shadow: var(--shadow-sm);
    }
    .feature-card.light-card {
      background-color: #ffffff;
      border: 1px solid #e5e0d8;
      color: var(--charcoal);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-deep);
    }
    .service-img {
      border-radius: var(--radius-card);
      border: 1px solid var(--gold);
      transition: transform 0.3s ease, border-color 0.3s;
      object-fit: cover;
      width: 100%;
      height: auto;
    }
    .service-img:hover {
      transform: scale(1.03);
      border-color: #d4af7a;
    }
    /* 流程连接线 */
    .process-line {
      height: 1px;
      background-color: var(--gold);
      width: 40px;
      opacity: 0.6;
    }
    @media (max-width: 768px) {
      .process-line {
        display: none;
      }
    }
    /* FAQ 折叠 */
    .faq-item {
      border-left: 3px solid var(--gold);
      padding-left: 1.25rem;
      transition: background-color 0.3s;
      background-color: transparent;
      border-radius: 0 6px 6px 0;
    }
    .faq-item.active {
      background-color: rgba(245,242,237,0.08);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, opacity 0.25s;
      opacity: 0;
      color: #d1ccc0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      opacity: 1;
    }
    /* 按钮 */
    .btn-primary {
      background-color: var(--gold);
      color: #1f1f1f;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      letter-spacing: 0.03em;
      transition: background-color 0.3s ease, color 0.3s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background-color: var(--emerald);
      color: white;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--gold);
      color: var(--gold);
      font-weight: 500;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background-color: var(--gold);
      color: #1f1f1f;
    }
    /* 背景交替 */
    .bg-ivory {
      background-color: var(--ivory);
      color: var(--charcoal);
    }
    .bg-charcoal {
      background-color: var(--charcoal);
      color: var(--warm-white);
    }
    .text-muted {
      color: var(--muted-text);
    }
    .gold-text {
      color: var(--gold);
    }
    .emerald-text {
      color: var(--emerald);
    }
    .separator-line {
      width: 40px;
      height: 1px;
      background-color: var(--gold);
      margin: 1.5rem auto;
    }
    input, textarea {
      background: rgba(255,255,255,0.1);
      border: 1px solid rgba(240,237,230,0.4);
      color: white;
      border-radius: 6px;
      padding: 0.75rem 1rem;
      width: 100%;
      transition: border-color 0.2s;
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--gold);
      box-shadow: 0 0 0 2px rgba(196,154,108,0.3);
    }
    .bg-ivory input, .bg-ivory textarea {
      background: white;
      border: 1px solid #d1ccc0;
      color: var(--charcoal);
    }