/* roulang page: index */
:root {
      --deep-teal: #1a1f2b;
      --champagne-gold: #c9a96e;
      --warm-light-gray: #f8f7f4;
      --pure-white: #ffffff;
      --soft-text: #4a4f5a;
      --light-border: #eae8e3;
      --card-shadow: 0 2px 16px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 30px rgba(0,0,0,0.08);
      --radius-md: 12px;
      --radius-btn: 8px;
      --transition-base: 0.3s ease;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--warm-light-gray);
      color: #1e2128;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    h1, h2, h3, .serif-title {
      font-family: var(--font-serif);
      letter-spacing: -0.02em;
    }

    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 5vw;
      padding-right: 5vw;
    }

    /* 导航样式 */
    .glass-nav {
      background: rgba(26, 31, 43, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(201, 169, 110, 0.15);
      position: fixed;
      width: 100%;
      top: 0;
      z-index: 50;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-link {
      color: #d1d5db;
      transition: color 0.2s ease;
      position: relative;
      padding-bottom: 4px;
      font-weight: 400;
    }

    .nav-link:hover {
      color: var(--champagne-gold);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      bottom: 0;
      left: 0;
      background-color: var(--champagne-gold);
      transition: width 0.25s ease;
    }

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

    .hamburger-line {
      background-color: var(--champagne-gold);
      display: block;
      width: 24px;
      height: 2px;
      margin: 5px 0;
      transition: 0.3s;
    }

    /* 按钮体系 */
    .btn-primary {
      background-color: var(--champagne-gold);
      color: var(--deep-teal);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      transition: background-color 0.3s ease, transform 0.2s;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background-color: #b8924f;
      transform: scale(1.02);
    }

    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--deep-teal);
      color: var(--champagne-gold);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
    }

    .btn-secondary:hover {
      background-color: var(--deep-teal);
      color: var(--champagne-gold);
      border-color: var(--deep-teal);
    }

    /* 卡片样式 */
    .feature-card {
      background: var(--pure-white);
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      padding: 2rem 1.8rem;
    }

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

    .icon-gold {
      color: var(--champagne-gold);
      font-size: 2rem;
      margin-bottom: 1.25rem;
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--light-border);
      padding: 1.5rem 0;
      cursor: pointer;
    }

    .faq-question {
      font-size: 1.15rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--deep-teal);
    }

    .faq-icon {
      color: var(--champagne-gold);
      transition: transform 0.3s ease;
      font-size: 1.4rem;
      font-weight: 400;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, background-color 0.3s, padding 0.3s;
      background-color: transparent;
      border-radius: 6px;
      margin-top: 0;
      color: var(--soft-text);
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      background-color: #faf8f3;
      padding: 1rem 1.2rem;
      margin-top: 1rem;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 图片圆角与阴影 */
    .img-rounded {
      border-radius: 24px;
      box-shadow: 0 12px 24px rgba(0,0,0,0.06);
      width: 100%;
      height: auto;
      object-fit: cover;
    }

    /* 移动端菜单 */
    @media (max-width: 768px) {
      .desktop-menu {
        display: none;
      }
      .mobile-menu {
        display: block;
      }
      .hero-left {
        order: 1;
        text-align: center;
      }
      .hero-right {
        order: 2;
        margin-top: 2rem;
      }
      h1 {
        font-size: 2.5rem !important;
      }
      .grid-cols-3, .grid-cols-4 {
        grid-template-columns: 1fr !important;
      }
      .asymmetric-grid {
        grid-template-columns: 1fr !important;
      }
    }

    @media (min-width: 769px) {
      .mobile-menu {
        display: none;
      }
      .desktop-menu {
        display: flex;
      }
    }

    .hero-title-animation span {
      display: inline-block;
      animation: fadeInUp 0.8s ease forwards;
      opacity: 0;
    }

    @keyframes fadeInUp {
      0% { opacity: 0; transform: translateY(24px); }
      100% { opacity: 1; transform: translateY(0); }
    }