/* roulang page: index */
:root {
      --primary: #5B7B4B;
      --primary-dark: #3D5A3C;
      --accent: #D4913E;
      --accent-hover: #B87A2E;
      --bg-warm: #FDFBF7;
      --bg-card: #FFFFFF;
      --bg-mist: #F2F5F0;
      --text-main: #2C2416;
      --text-soft: #6B5E4F;
      --text-light: #8F8577;
      --border-light: rgba(44,36,22,0.08);
      --border-soft: rgba(44,36,22,0.12);
      --shadow-sm: 0 2px 8px rgba(44,36,22,0.06);
      --shadow-card: 0 4px 16px rgba(44,36,22,0.08);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', Georgia, serif;
      --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Segoe UI', sans-serif;
      --transition: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
      padding: 0;
    }

    h1, h2, h3, .font-serif {
      font-family: var(--font-serif);
      font-weight: 700;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--primary-dark);
    }

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

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

    /* 导航 */
    .navbar-lejing {
      background-color: rgba(253, 251, 247, 0.92);
      backdrop-filter: blur(8px);
      box-shadow: 0 2px 12px rgba(44,36,22,0.04);
      padding: 14px 0;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1020;
      transition: var(--transition);
    }
    .navbar-lejing.scrolled {
      box-shadow: var(--shadow-sm);
      background-color: rgba(255,255,255,0.96);
    }

    .navbar-container {
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      flex-wrap: wrap;
    }

    .nav-left, .nav-right {
      display: flex;
      gap: 2rem;
      list-style: none;
      margin: 0;
      padding: 0;
    }

    .nav-left a, .nav-right a {
      color: var(--text-soft);
      font-weight: 500;
      font-size: 0.95rem;
      letter-spacing: 0.3px;
      transition: var(--transition);
      padding: 6px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-left a:hover, .nav-right a:hover {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }

    .navbar-brand-custom {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--primary);
      margin: 0 3rem;
      letter-spacing: 2px;
      white-space: nowrap;
      text-decoration: none;
      transition: var(--transition);
    }
    .navbar-brand-custom:hover {
      color: var(--primary-dark);
    }

    .navbar-toggler {
      border: none;
      color: var(--primary);
      font-size: 1.6rem;
      padding: 0.25rem 0.5rem;
      background: transparent;
      display: none;
    }

    @media (max-width: 992px) {
      .navbar-container {
        justify-content: space-between;
      }
      .navbar-toggler {
        display: block;
        order: 2;
      }
      .nav-left, .nav-right {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: center;
        gap: 0.8rem;
        padding: 1.5rem 0 0.5rem;
        order: 3;
      }
      .nav-left.active, .nav-right.active {
        display: flex;
      }
      .navbar-brand-custom {
        margin: 0;
        order: 1;
        font-size: 1.6rem;
      }
    }

    /* Hero */
    .hero-section {
      padding: 140px 0 100px;
      background: linear-gradient(180deg, #FDFBF7 0%, #F8F5EF 100%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-title {
      font-size: 3.4rem;
      font-weight: 800;
      line-height: 1.2;
      color: var(--text-main);
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-soft);
      margin-bottom: 2.2rem;
      max-width: 90%;
    }
    .btn-primary-custom {
      background-color: var(--primary);
      border: none;
      color: white;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: var(--transition);
      letter-spacing: 0.5px;
    }
    .btn-primary-custom:hover {
      background-color: var(--primary-dark);
      color: white;
      transform: scale(1.02);
    }
    .btn-outline-custom {
      border: 1.5px solid var(--primary);
      color: var(--primary);
      background: transparent;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline-custom:hover {
      background-color: rgba(91,123,75,0.08);
      color: var(--primary-dark);
    }
    .hero-image img {
      border-radius: 24px;
      box-shadow: var(--shadow-card);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-title {
        font-size: 2.5rem;
      }
      .hero-sub {
        max-width: 100%;
      }
      .hero-image {
        margin-top: 2rem;
      }
    }

    /* 亮点网格 */
    .highlights-section {
      padding: 90px 0;
    }
    .highlights-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr;
      gap: 24px;
    }
    .highlight-card {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-card);
    }
    .highlight-card.wide {
      grid-column: span 1;
    }
    .highlight-card .icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 1.2rem;
    }
    .highlight-card h3 {
      font-size: 1.5rem;
      margin-bottom: 0.5rem;
    }
    .highlight-card p {
      color: var(--text-soft);
    }
    .sub-grid {
      display: grid;
      grid-template-columns: 1fr;
      gap: 24px;
    }

    @media (max-width: 768px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 案例瀑布 */
    .cases-section {
      padding: 80px 0;
      background: var(--bg-mist);
    }
    .masonry {
      column-count: 2;
      column-gap: 24px;
    }
    .case-card {
      break-inside: avoid;
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      box-shadow: var(--shadow-card);
    }
    .case-card img {
      width: 100%;
      height: auto;
      object-fit: cover;
      border-radius: var(--radius-md) var(--radius-md) 0 0;
    }
    .case-text {
      padding: 20px;
    }
    .case-tag {
      background: #F2F5F0;
      color: var(--primary-dark);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 8px;
    }

    @media (max-width: 768px) {
      .masonry {
        column-count: 1;
      }
    }

    /* 对比 */
    .comparison-section {
      padding: 90px 0;
    }
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 2rem;
      align-items: center;
    }
    .vs-divider {
      font-size: 2rem;
      font-weight: 800;
      color: var(--accent);
    }
    .compare-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
    }
    .compare-card.recommended {
      border: 2px solid var(--primary);
      background: #FAF8F3;
    }
    .compare-list {
      list-style: none;
      padding: 0;
    }
    .compare-list li {
      margin-bottom: 0.8rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    @media (max-width: 768px) {
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .vs-divider {
        text-align: center;
      }
    }

    /* FAQ */
    .faq-section {
      padding: 80px 0;
      background: var(--bg-warm);
    }
    .accordion-button:not(.collapsed) {
      background-color: #F7F5F0;
      color: var(--primary-dark);
      box-shadow: none;
    }
    .accordion-button:focus {
      box-shadow: none;
      border-color: var(--border-light);
    }
    .accordion-item {
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
    }
    .faq-number {
      background: var(--primary);
      color: white;
      border-radius: 50%;
      width: 28px;
      height: 28px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin-right: 12px;
    }

    /* CTA */
    .cta-section {
      background: var(--primary-dark);
      color: white;
      padding: 90px 0;
      text-align: center;
    }
    .cta-title {
      font-size: 2.5rem;
      font-weight: 700;
    }
    .btn-cta-white {
      background: white;
      color: var(--primary-dark);
      border: none;
      padding: 0.9rem 2.8rem;
      font-weight: 700;
      border-radius: var(--radius-sm);
    }

    /* Footer */
    .footer-section {
      background: #F5F2EB;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    .social-icons i {
      font-size: 1.4rem;
      margin-right: 16px;
      color: var(--text-soft);
      transition: var(--transition);
    }
    .social-icons i:hover {
      color: var(--primary);
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }