/* roulang page: index */
:root {
      --primary: #E8452D;
      --secondary: #2A2D34;
      --accent: #FFB800;
      --bg: #F5F1EC;
      --border-light: #E8E3DE;
      --text-dark: #2A2D34;
      --text-muted: #6B6B6B;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg);
      color: var(--text-dark);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }

    .serif-text {
      font-family: 'Noto Serif SC', 'STSong', 'SimSun', serif;
    }

    .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;
      }
    }

    /* 导航栏 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.02);
      z-index: 50;
      transition: background 0.3s ease;
      display: flex;
      align-items: center;
    }

    .nav-link {
      font-weight: 500;
      color: var(--text-dark);
      text-decoration: none;
      padding: 0.5rem 0.75rem;
      transition: color 0.2s;
      position: relative;
    }
    .nav-link:hover {
      color: var(--primary);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-link:hover::after {
      width: 60%;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 0.6rem 1.8rem;
      font-weight: 600;
      letter-spacing: 0.05em;
      transition: background 0.2s, box-shadow 0.2s;
      border: none;
      cursor: pointer;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #C93A25;
      box-shadow: 0 0 0 2px rgba(232, 69, 45, 0.3);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 0.5rem 1.8rem;
      font-weight: 600;
      letter-spacing: 0.05em;
      transition: background 0.2s;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(232, 69, 45, 0.08);
    }

    .btn-accent {
      background: var(--accent);
      color: #2A2D34;
      border-radius: 20px;
      padding: 0.5rem 1.8rem;
      font-weight: 700;
      letter-spacing: 0.03em;
      transition: filter 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-accent:hover {
      filter: brightness(1.1);
    }

    .card-hover {
      transition: transform 0.25s ease, box-shadow 0.3s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .grid-asymmetric {
      display: grid;
      grid-template-columns: 1fr 0.8fr 1fr;
      gap: 24px;
    }
    @media (max-width: 1024px) {
      .grid-asymmetric {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .grid-asymmetric {
        grid-template-columns: 1fr;
      }
    }

    .masonry {
      column-count: 3;
      column-gap: 24px;
    }
    @media (max-width: 1024px) {
      .masonry {
        column-count: 2;
      }
    }
    @media (max-width: 768px) {
      .masonry {
        column-count: 1;
      }
    }
    .masonry-item {
      break-inside: avoid;
      margin-bottom: 24px;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s ease, background 0.2s;
      background: transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      background: rgba(0,0,0,0.02);
      padding: 16px;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    .img-zoom img {
      transition: transform 0.3s ease;
    }
    .img-zoom:hover img {
      transform: scale(1.03);
    }

    .hero-image-mask {
      position: relative;
      overflow: hidden;
      border-radius: 12px;
    }
    .hero-image-mask::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(232,69,45,0.25) 0%, rgba(255,255,255,0) 60%);
      pointer-events: none;
    }

    .compare-left {
      background: #EDEDED;
    }
    .compare-right {
      background: #FEF5F3;
    }