/* roulang page: index */
:root {
      --primary: #2C2C2E;
      --primary-light: #1E1E20;
      --accent: #C8A97E;
      --accent-hover: #B08D5B;
      --bg-warm: #FAF8F5;
      --card-bg: #FFFFFF;
      --text-body: #4A4A4D;
      --text-muted: #6B6B6F;
      --border-light: #E5E2DD;
      --border-subtle: rgba(0,0,0,0.04);
      --shadow-card: 0 2px 12px rgba(0,0,0,0.03);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.07);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-smooth: 0.3s cubic-bezier(0.25,0.1,0.25,1);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      color: var(--primary);
      font-weight: 700;
    }
    h1 {
      font-size: clamp(3rem, 7vw, 5.5rem);
      font-weight: 800;
      letter-spacing: -0.02em;
      line-height: 1.1;
    }
    h2 {
      font-size: clamp(2rem, 4vw, 3rem);
      font-weight: 700;
      letter-spacing: -0.01em;
      line-height: 1.2;
    }
    h3 {
      font-size: 1.25rem;
      font-weight: 600;
      line-height: 1.4;
    }
    .text-body {
      color: var(--text-body);
    }
    .text-muted {
      color: var(--text-muted);
    }
    .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;
      }
    }
    /* 导航透明玻璃态 */
    .nav-glass {
      background: rgba(30,30,32,0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(255,255,255,0.08);
      box-shadow: 0 4px 20px rgba(0,0,0,0.15);
      transition: var(--transition-smooth);
    }
    .nav-solid {
      background: #FFFFFF;
      box-shadow: 0 2px 16px rgba(0,0,0,0.06);
      border-bottom: 1px solid rgba(0,0,0,0.04);
    }
    .nav-link {
      color: #FAF8F5;
      transition: color 0.2s;
      font-weight: 500;
      text-decoration: none;
    }
    .nav-solid .nav-link {
      color: var(--primary);
    }
    .nav-link:hover {
      color: var(--accent);
    }
    .btn-primary {
      background: var(--primary);
      color: #FAF8F5;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(0,0,0,0.15);
    }
    .btn-accent {
      background: var(--accent);
      color: #FFFFFF;
      border-radius: var(--radius-btn);
      padding: 14px 36px;
      font-weight: 600;
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-accent:hover {
      background: var(--accent-hover);
      box-shadow: 0 0 20px rgba(200,169,126,0.4);
    }
    .text-link {
      color: var(--accent);
      text-decoration: underline;
      text-underline-offset: 4px;
      text-decoration-thickness: 1px;
      transition: 0.2s;
    }
    .text-link:hover {
      color: var(--accent-hover);
      text-decoration-thickness: 2px;
    }
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      border: 1px solid var(--border-subtle);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: #F3F0EC;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent);
      font-size: 20px;
      transition: var(--transition-smooth);
    }
    .card:hover .service-icon {
      background: var(--accent);
      color: white;
    }
    .faq-item {
      border-bottom: 1px solid #EEECE8;
      cursor: pointer;
    }
    .faq-question {
      padding: 20px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--primary);
    }
    .faq-icon {
      transition: transform 0.25s;
      font-size: 1.25rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s;
      padding-left: 16px;
      border-left: 3px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
      border-left-color: var(--accent);
      background: rgba(200,169,126,0.02);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    input, textarea {
      border: 1px solid var(--border-light);
      border-radius: 6px;
      padding: 12px 16px;
      width: 100%;
      transition: 0.2s;
      font-family: inherit;
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(200,169,126,0.15);
    }
    footer {
      background: #1E1E20;
      color: #9A9A9E;
    }
    /* 移动端菜单 */
    .mobile-menu {
      display: none;
      flex-direction: column;
      background: white;
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
    }