/* roulang page: index */
/* ===== 设计变量 ===== */
    :root {
      --deep-teal: #0B1A1A;
      --warm-gold: #C49A6C;
      --gold-dark: #A67B4A;
      --bg-warm: #F7F5F2;
      --text-primary: #2E3A3A;
      --text-secondary: #6B7171;
      --text-on-dark: #ffffff;
      --border-gold-20: rgba(196, 154, 108, 0.2);
      --border-gold-30: rgba(196, 154, 108, 0.3);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.03);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.06);
      --radius-card: 8px;
      --radius-service: 12px;
      --transition-smooth: 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
    }

    /* 基础重置 */
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-warm);
      color: var(--text-primary);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-smooth);
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    /* 导航栏自定义 */
    .navbar {
      background-color: rgba(255,255,255,0.96);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-gold-20);
      transition: box-shadow var(--transition-smooth);
    }
    .nav-link {
      color: var(--text-primary);
      font-weight: 500;
      position: relative;
      padding: 0.5rem 0;
    }
    .nav-link:hover,
    .nav-link.active {
      color: var(--warm-gold);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--warm-gold);
    }
    .hamburger-line {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--deep-teal);
      margin: 5px 0;
      transition: all 0.3s ease;
    }
    .mobile-menu-open .hamburger-line:nth-child(1) {
      transform: translateY(7px) rotate(45deg);
    }
    .mobile-menu-open .hamburger-line:nth-child(2) {
      opacity: 0;
    }
    .mobile-menu-open .hamburger-line:nth-child(3) {
      transform: translateY(-7px) rotate(-45deg);
    }

    /* 按钮样式 */
    .btn-primary {
      background-color: var(--warm-gold);
      color: white;
      font-weight: 600;
      letter-spacing: 0.05em;
      border-radius: 8px;
      padding: 0.75rem 2rem;
      transition: background-color var(--transition-smooth), transform var(--transition-smooth);
      border: none;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background-color: var(--gold-dark);
      transform: translateY(-2px);
    }
    .btn-outline {
      background: transparent;
      color: var(--warm-gold);
      border: 2px solid var(--warm-gold);
      font-weight: 600;
      letter-spacing: 0.05em;
      border-radius: 8px;
      padding: 0.75rem 2rem;
      transition: background-color var(--transition-smooth), color var(--transition-smooth), transform var(--transition-smooth);
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background-color: rgba(196, 154, 108, 0.1);
      transform: translateY(-2px);
    }

    /* 卡片通用 */
    .card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: box-shadow var(--transition-smooth), transform var(--transition-smooth);
      border: 1px solid var(--border-gold-20);
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
      border-color: var(--warm-gold);
    }

    /* Hero动画 */
    @keyframes fadeInUp {
      0% { opacity: 0; transform: translateY(10px); }
      100% { opacity: 1; transform: translateY(0); }
    }
    .animate-hero {
      animation: fadeInUp 0.8s ease forwards;
    }

    /* 数字计数动画 */
    @keyframes countUp {
      0% { opacity: 0; transform: translateY(6px); }
      100% { opacity: 1; transform: translateY(0); }
    }
    .count-number {
      display: inline-block;
      animation: countUp 0.6s ease forwards;
    }

    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-gold-20);
    }
    .faq-question {
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1.2rem 0;
      font-weight: 600;
      color: var(--text-primary);
    }
    .faq-icon {
      transition: transform 0.3s ease;
      color: var(--warm-gold);
      font-size: 1.5rem;
      font-weight: 300;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      padding-right: 2rem;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 1.2rem;
    }

    /* 遮罩与图片区域 */
    .image-overlay {
      position: relative;
    }
    .image-overlay::after {
      content: '';
      position: absolute;
      top: 0; left: 0; right: 0; bottom: 0;
      background: linear-gradient(180deg, rgba(11,26,26,0.1) 0%, rgba(11,26,26,0.65) 100%);
      border-radius: inherit;
    }