/* roulang page: index */
:root {
      --primary: #4A3F35;
      --accent: #D09B6A;
      --accent-hover: #B8864E;
      --bg: #F9F6F2;
      --white: #FFFFFF;
      --text-primary: #2C2723;
      --text-secondary: #6B625B;
      --text-tertiary: #9A9188;
      --border: #EAE5DF;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0px 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-card-hover: 0px 12px 32px rgba(0, 0, 0, 0.08);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --max-width: 1280px;
      --section-padding: 120px 0;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航样式 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      transition: background-color 0.3s, box-shadow 0.3s;
      background-color: transparent;
      border-bottom: 1px solid transparent;
    }

    .site-header.scrolled {
      background-color: rgba(74, 63, 53, 0.9);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.08);
      border-bottom: 1px solid rgba(234, 229, 223, 0.15);
    }

    .header-inner {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      height: 70px;
      transition: height 0.3s;
    }

    .scrolled .header-inner {
      height: 64px;
    }

    .logo {
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .scrolled .logo {
      color: var(--white);
    }
    .logo i {
      color: var(--accent);
      font-size: 28px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--text-primary);
      font-weight: 500;
      font-size: 15px;
      position: relative;
      padding: 4px 0;
      transition: color 0.2s;
    }
    .scrolled .nav-links a {
      color: #EAE5DF;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      left: 50%;
      bottom: 0;
      width: 0;
      height: 2px;
      background-color: var(--accent);
      transition: width 0.25s ease, left 0.25s ease;
      transform: translateX(-50%);
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a:hover::after {
      width: 100%;
      left: 50%;
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .search-icon {
      color: var(--text-primary);
      font-size: 18px;
      cursor: pointer;
      transition: color 0.2s;
    }
    .scrolled .search-icon {
      color: #EAE5DF;
    }
    .search-icon:hover {
      color: var(--accent);
    }
    .contact-btn {
      border: 1px solid var(--accent);
      background: transparent;
      color: var(--accent);
      padding: 8px 20px;
      border-radius: var(--radius-btn);
      font-weight: 500;
      font-size: 14px;
      transition: all 0.3s;
      text-decoration: none;
      display: inline-block;
    }
    .scrolled .contact-btn {
      color: var(--accent);
      border-color: var(--accent);
    }
    .contact-btn:hover {
      background-color: var(--accent);
      color: white;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary);
      cursor: pointer;
    }
    .scrolled .mobile-menu-btn {
      color: white;
    }

    /* Hero 动态背景 */
    .hero-bg {
      position: absolute;
      inset: 0;
      overflow: hidden;
      z-index: 0;
    }
    .shape {
      position: absolute;
      border-radius: 50%;
      opacity: 0.08;
      animation: float 20s infinite alternate ease-in-out;
    }
    .shape1 { width: 400px; height: 400px; background: var(--accent); top: -100px; left: -80px; }
    .shape2 { width: 300px; height: 300px; background: var(--primary); bottom: 50px; right: -60px; animation-duration: 25s; }
    .shape3 { width: 150px; height: 150px; background: var(--accent); top: 40%; left: 60%; border-radius: 30px; opacity: 0.06; animation-duration: 18s; }

    @keyframes float {
      0% { transform: translate(0, 0) rotate(0deg); }
      100% { transform: translate(30px, 40px) rotate(12deg); }
    }

    /* 卡片与组件 */
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border: 1px solid var(--border);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .btn-primary {
      background-color: var(--accent);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: background-color 0.25s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      background-color: var(--accent-hover);
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent);
      color: var(--accent);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      transition: all 0.3s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      background-color: var(--accent);
      color: white;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      line-height: 1.3;
      margin-bottom: 16px;
      color: var(--text-primary);
    }
    .section-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 700px;
      margin: 0 auto 40px;
    }

    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 20px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 18px;
      font-weight: 600;
      color: var(--text-primary);
      transition: color 0.2s;
    }
    .faq-item.active .faq-question {
      color: var(--accent);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      line-height: 1.7;
      padding-left: 12px;
      border-left: 4px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
      border-left-color: var(--accent);
    }

    @media (max-width: 768px) {
      .nav-links, .header-actions .search-icon, .header-actions .contact-btn {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .mobile-menu {
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(74, 63, 53, 0.98);
        backdrop-filter: blur(12px);
        flex-direction: column;
        padding: 20px;
        gap: 20px;
        display: none;
      }
      .mobile-menu.open {
        display: flex;
      }
      .mobile-menu a {
        color: #EAE5DF;
        font-size: 18px;
      }
      .section-title {
        font-size: 30px;
      }
      .container {
        padding: 0 20px;
      }
    }