/* roulang page: index */
:root {
      --primary: #4A3728;
      --primary-light: #6B5E4E;
      --accent: #C8A96E;
      --accent-hover: #b8944c;
      --bg-cream: #FDFBF7;
      --bg-white: #FFFFFF;
      --text-dark: #2C2416;
      --text-muted: #6B5E4E;
      --text-light: #FFFFFF;
      --forest: #2D5A3B;
      --forest-light: #3e7a52;
      --border-light: rgba(74, 55, 40, 0.1);
      --shadow-card: 0 4px 20px rgba(74, 55, 40, 0.06);
      --shadow-card-hover: 0 12px 32px rgba(74, 55, 40, 0.12);
      --shadow-nav: 0 2px 12px rgba(0,0,0,0.04);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-img: 24px;
      --transition: all 0.25s ease;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Inter', system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-cream);
      color: var(--text-dark);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4, h5, h6 {
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 0.75rem;
      letter-spacing: -0.01em;
    }

    p {
      margin-bottom: 1rem;
      color: var(--text-muted);
      font-size: 1rem;
      line-height: 1.7;
    }

    a {
      color: var(--accent);
      text-decoration: none;
      transition: var(--transition);
    }

    a:hover {
      color: var(--accent-hover);
      text-decoration: underline;
    }

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

    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 按钮体系 */
    .btn-primary-custom {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      border: none;
      color: var(--text-light);
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      line-height: 1.4;
      box-shadow: 0 8px 18px rgba(74, 55, 40, 0.18);
      text-decoration: none;
      font-size: 0.95rem;
    }

    .btn-primary-custom:hover {
      filter: brightness(1.1);
      box-shadow: 0 12px 26px rgba(74, 55, 40, 0.28);
      transform: translateY(-1px);
      color: white;
      text-decoration: none;
    }

    .btn-outline-custom {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 10px 32px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      font-size: 0.95rem;
    }

    .btn-outline-custom:hover {
      background: var(--primary);
      color: white;
      text-decoration: none;
      box-shadow: 0 8px 18px rgba(74, 55, 40, 0.18);
    }

    .btn-light-custom {
      background: white;
      color: var(--primary);
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      border: none;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
    }

    .btn-light-custom:hover {
      background: var(--bg-cream);
      color: var(--primary);
      box-shadow: 0 8px 18px rgba(0,0,0,0.1);
      text-decoration: none;
    }

    /* 导航栏 */
    .navbar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(253, 251, 247, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--accent);
      z-index: 1000;
      display: flex;
      align-items: center;
      padding: 0 20px;
      box-shadow: var(--shadow-nav);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
    }

    .logo {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--primary);
      letter-spacing: -0.5px;
      white-space: nowrap;
      text-decoration: none;
    }

    .logo:hover {
      color: var(--primary);
      text-decoration: none;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-dark);
      text-decoration: none;
      position: relative;
      padding: 4px 0;
      transition: var(--transition);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: var(--transition);
    }

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

    .nav-links a:hover::after {
      width: 100%;
    }

    .search-box {
      background: #f0ede8;
      border-radius: 50px;
      padding: 8px 18px;
      display: flex;
      align-items: center;
      gap: 8px;
      color: var(--text-muted);
      font-size: 0.9rem;
      border: 1px solid transparent;
    }

    .search-box input {
      border: none;
      background: transparent;
      outline: none;
      width: 100px;
      font-size: 0.9rem;
      color: var(--text-dark);
    }

    .search-box i {
      color: var(--primary-light);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary);
    }

    /* 区块间距 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-size: 2.3rem;
      font-weight: 600;
      margin-bottom: 1rem;
      color: var(--text-dark);
    }

    .section-subtitle {
      color: var(--text-muted);
      font-size: 1.1rem;
      margin-bottom: 2.5rem;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background-color: var(--bg-cream);
    }

    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      line-height: 1.3;
      color: var(--primary);
    }

    .hero-image {
      border-radius: var(--radius-img);
      box-shadow: var(--shadow-card);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 服务卡片 */
    .service-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.5rem;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      height: 100%;
      text-align: center;
    }

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

    .icon-circle {
      width: 64px;
      height: 64px;
      background: var(--bg-cream);
      border: 1px solid var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1.5rem;
      color: var(--accent);
      font-size: 1.8rem;
    }

    /* 数据徽章 */
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary);
    }
    .stat-label {
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }
    .case-img {
      width: 100%;
      aspect-ratio: 16/9;
      object-fit: cover;
    }

    /* FAQ 手风琴 */
    .accordion-button:not(.collapsed) {
      background-color: var(--bg-cream);
      color: var(--primary);
      box-shadow: none;
    }
    .accordion-button:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 0.15rem rgba(200,169,110,0.3);
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      padding: 80px 0;
      color: white;
    }

    /* 页脚 */
    .footer {
      background: var(--primary);
      color: rgba(255,255,255,0.85);
      padding: 60px 0 30px;
    }
    .footer a {
      color: rgba(255,255,255,0.8);
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--accent);
    }

    @media (max-width: 992px) {
      .nav-links, .search-box {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero h1 {
        font-size: 2.5rem;
      }
    }

    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      .hero {
        padding: 120px 0 60px;
        text-align: center;
      }
      .hero .col-lg-6 {
        margin-bottom: 2rem;
      }
      .section-title {
        font-size: 2rem;
      }
    }