/* roulang page: index */
:root {
      --charcoal: #1a1a1a;
      --champagne: #c8a45c;
      --burgundy: #7b1a2b;
      --ivory: #f5f0e8;
      --darkbrown: #2c2416;
      --golddark: #a8883a;
      --gold-gradient: linear-gradient(135deg, #c8a45c 0%, #a8883a 100%);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.08);
      --shadow-md: 0 8px 32px rgba(0,0,0,0.15);
      --radius-card: 8px;
      --radius-btn: 6px;
      --transition-base: 0.3s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background-color: var(--ivory);
      color: var(--charcoal);
      line-height: 1.8;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }
    .container-custom {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航双层 */
    .nav-brand-row {
      height: 64px;
      background-color: var(--charcoal);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding-left: 40px;
      padding-right: 40px;
    }
    .nav-tabs-row {
      height: 48px;
      background-color: var(--darkbrown);
      display: flex;
      align-items: center;
      overflow-x: auto;
      white-space: nowrap;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
      padding-left: 40px;
      padding-right: 40px;
    }
    .nav-tabs-row::-webkit-scrollbar {
      display: none;
    }
    .nav-tab {
      color: var(--champagne);
      font-size: 15px;
      padding: 12px 20px;
      border-bottom: 2px solid transparent;
      transition: border-color 0.25s, color 0.25s;
      text-decoration: none;
      display: inline-block;
    }
    .nav-tab:hover,
    .nav-tab.active {
      border-bottom-color: var(--champagne);
      font-weight: 600;
    }
    .logo-text {
      font-size: 24px;
      font-weight: 700;
      letter-spacing: 3px;
      color: var(--champagne);
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .logo-diamond {
      width: 20px;
      height: 20px;
      border: 2px solid var(--champagne);
      transform: rotate(45deg);
      display: inline-block;
    }
    .btn-primary {
      background: var(--gold-gradient);
      color: var(--charcoal);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      border: none;
      cursor: pointer;
      transition: transform 0.25s, box-shadow 0.25s;
      text-decoration: none;
      display: inline-block;
      letter-spacing: 0.5px;
    }
    .btn-primary:hover {
      transform: scale(1.03);
      box-shadow: var(--shadow-md);
    }
    .btn-outline {
      background: transparent;
      color: var(--champagne);
      border: 1.5px solid var(--champagne);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 12px 32px;
      cursor: pointer;
      transition: background 0.25s, color 0.25s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(200,164,92,0.1);
    }
    .section-padding {
      padding-top: 100px;
      padding-bottom: 100px;
    }
    .h2-title {
      font-size: 34px;
      font-weight: 600;
      color: var(--charcoal);
      margin-bottom: 16px;
      position: relative;
      display: inline-block;
    }
    .h2-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 2px;
      background-color: var(--champagne);
    }
    .card {
      background: var(--ivory);
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid rgba(200,164,92,0.15);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s, box-shadow 0.3s;
      height: 100%;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .dark-card {
      background: var(--darkbrown);
      color: var(--ivory);
    }
    .tag-burgundy {
      background: rgba(123,26,43,0.2);
      color: var(--champagne);
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      font-weight: 500;
    }
    .hero-section {
      min-height: 100vh;
      background-color: var(--charcoal);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(26,26,26,0.92) 0%, rgba(26,26,26,0.7) 60%, rgba(26,26,26,0.4) 100%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .hero-text {
      max-width: 600px;
    }
    .hero-image-preview {
      width: 40%;
      min-height: 400px;
      background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
      border-radius: 8px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
      display: none;
    }
    @media (min-width: 1024px) {
      .hero-image-preview {
        display: block;
      }
    }
    .faq-item {
      background: var(--ivory);
      border: 1px solid rgba(200,164,92,0.2);
      border-radius: 6px;
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      background: var(--charcoal);
      color: var(--ivory);
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 500;
    }
    .faq-answer {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #faf8f5;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 20px 24px;
    }
    .stat-number {
      font-family: 'Playfair Display', Georgia, serif;
      font-size: 48px;
      font-weight: 700;
      color: var(--champagne);
    }
    footer a {
      color: #b0b0b0;
      text-decoration: none;
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--champagne);
    }
    @media (max-width: 768px) {
      .nav-brand-row {
        padding-left: 20px;
        padding-right: 20px;
      }
      .nav-tabs-row {
        padding-left: 20px;
        padding-right: 20px;
      }
      .section-padding {
        padding-top: 60px;
        padding-bottom: 60px;
      }
      .h2-title {
        font-size: 26px;
      }
      .hero-text h1 {
        font-size: 36px;
      }
      .container-custom {
        padding-left: 20px;
        padding-right: 20px;
      }
    }

@keyframes bounce {
          0%, 100% { transform: translateX(-50%) translateY(0); }
          50% { transform: translateX(-50%) translateY(8px); }
        }