/* roulang page: index */
:root {
      --deep-brown: #4A2E2B;
      --dark-gold: #C9A96E;
      --warm-bg: #FAF7F2;
      --ivory-card: #FFFDF9;
      --text-primary: #2C1E1B;
      --text-secondary: #6B5A56;
      --accent-bronze: #B8863C;
      --success-green: #3D5A3C;
      --border-light: #E8DFD5;
      --shadow-sm: 0 2px 12px rgba(74, 46, 43, 0.06);
      --shadow-hover: 0 8px 24px rgba(74, 46, 43, 0.12);
      --card-radius-lg: 16px;
      --card-radius-md: 12px;
      --btn-radius: 8px;
      --transition-base: all 0.25s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--warm-bg);
      color: var(--text-primary);
      line-height: 1.75;
      font-size: 16px;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
    }

    a {
      color: var(--deep-brown);
      text-decoration: none;
      transition: var(--transition-base);
    }

    a:hover {
      color: var(--accent-bronze);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 15px;
      padding-right: 15px;
    }

    /* 导航卡片化面板 */
    .navbar-card {
      background: var(--ivory-card);
      border-radius: var(--card-radius-md);
      box-shadow: var(--shadow-sm);
      margin-top: 20px;
      padding: 12px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      position: sticky;
      top: 20px;
      z-index: 1020;
      border: 1px solid var(--border-light);
    }

    .logo-brand {
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--deep-brown);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo-brand i {
      color: var(--dark-gold);
      font-size: 2rem;
    }

    .nav-entry {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
    }

    .nav-chip {
      background: transparent;
      border-radius: 8px;
      padding: 8px 16px;
      display: flex;
      align-items: center;
      gap: 6px;
      color: var(--text-primary);
      font-weight: 500;
      transition: var(--transition-base);
      border: 1px solid transparent;
    }

    .nav-chip i {
      color: var(--dark-gold);
      font-size: 1rem;
    }

    .nav-chip:hover {
      background: rgba(201, 169, 110, 0.08);
      border-color: var(--dark-gold);
      color: var(--deep-brown);
    }

    .btn-primary-custom {
      background: var(--deep-brown);
      color: var(--dark-gold);
      border: none;
      padding: 12px 28px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      transition: var(--transition-base);
      box-shadow: 0 2px 6px rgba(0,0,0,0.1);
      white-space: nowrap;
    }

    .btn-primary-custom:hover {
      background: #3A201D;
      box-shadow: 0 0 12px var(--accent-bronze);
      color: #f0e4c0;
    }

    .btn-outline-gold {
      background: transparent;
      border: 2px solid var(--dark-gold);
      color: var(--deep-brown);
      padding: 10px 24px;
      border-radius: var(--btn-radius);
      font-weight: 600;
      transition: var(--transition-base);
    }

    .btn-outline-gold:hover {
      background: rgba(201, 169, 110, 0.1);
      border-color: var(--accent-bronze);
      color: #2C1E1B;
    }

    .hero-section {
      background: radial-gradient(circle at 30% 40%, #FFFDF9 0%, #FAF7F2 80%);
      padding: 60px 0;
      margin-top: 20px;
    }

    .hero-title {
      font-size: 44px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--deep-brown);
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin: 20px 0;
    }

    .badge-stat {
      background: var(--ivory-card);
      border-radius: 12px;
      padding: 12px 18px;
      display: inline-flex;
      align-items: center;
      gap: 10px;
      box-shadow: var(--shadow-sm);
    }

    .stat-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--dark-gold);
    }

    .image-card-hero {
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .image-card-hero img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    .gold-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(201,169,110,0.7));
      padding: 20px;
      color: #2C1E1B;
      font-weight: 600;
    }

    .section-title {
      font-size: 32px;
      font-weight: 600;
      color: var(--deep-brown);
      margin-bottom: 16px;
    }

    .data-badge-item {
      background: var(--ivory-card);
      border-radius: 12px;
      padding: 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .highlight-card {
      background: var(--ivory-card);
      border-radius: var(--card-radius-lg);
      padding: 32px 28px;
      transition: var(--transition-base);
      border: 1px solid transparent;
      box-shadow: var(--shadow-sm);
      height: 100%;
    }

    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-bottom: 3px solid var(--dark-gold);
    }

    .case-card {
      background: var(--ivory-card);
      border-radius: var(--card-radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
      margin-bottom: 24px;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .case-card img {
      transition: transform 0.3s ease;
    }

    .case-card:hover img {
      transform: scale(1.03);
    }

    .compare-card {
      background: var(--ivory-card);
      border-radius: var(--card-radius-lg);
      padding: 32px;
      border: 1px solid var(--border-light);
    }

    .compare-card.recommended {
      border: 2px solid var(--dark-gold);
      box-shadow: 0 4px 16px rgba(201,169,110,0.15);
    }

    .accordion-custom .accordion-item {
      background: var(--ivory-card);
      border-radius: var(--card-radius-md) !important;
      margin-bottom: 12px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

    .accordion-custom .accordion-button {
      font-weight: 600;
      color: var(--text-primary);
      background: transparent;
      box-shadow: none;
    }

    .accordion-custom .accordion-button:not(.collapsed) {
      color: var(--deep-brown);
      background: transparent;
      border-left: 3px solid var(--dark-gold);
    }

    .cta-banner {
      background: var(--deep-brown);
      border-radius: 24px;
      padding: 60px 40px;
      color: white;
      text-align: center;
      margin: 60px 0;
      background-image: linear-gradient(45deg, #3A201D 0%, #4A2E2B 100%);
    }

    footer {
      background: #2C1E1B;
      color: #cfc5b0;
      padding: 60px 0 30px;
      border-radius: 24px 24px 0 0;
    }

    footer a {
      color: #cfc5b0;
    }

    footer a:hover {
      color: var(--dark-gold);
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 36px;
      }
      .navbar-card {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-entry {
        margin-top: 10px;
      }
    }