/* roulang page: index */
:root {
      --primary: #E43D2A;
      --dark: #1A1A1A;
      --gold: #F5A623;
      --bg: #FAFAFA;
      --text: #1A1A1A;
      --text-muted: #555555;
      --card-bg: #FFFFFF;
      --border-light: #e5e7eb;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(228,61,42,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-img: 16px;
    }
    * {
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      margin: 0;
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.8;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 640px) {
      .container {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    /* 导航毛玻璃效果 */
    .nav-blur {
      background-color: rgba(26, 26, 26, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
    }
    /* 动画定义 */
    @keyframes pulse-gold {
      0% { box-shadow: 0 0 0 0 rgba(245, 166, 35, 0.5); }
      70% { box-shadow: 0 0 0 8px rgba(245, 166, 35, 0); }
      100% { box-shadow: 0 0 0 0 rgba(245, 166, 35, 0); }
    }
    .btn-cta-pulse {
      animation: pulse-gold 2s infinite;
    }
    .hover-lift {
      transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .hover-lift:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    /* 手风琴过渡 */
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.4s ease, background 0.3s;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-top: 1rem;
      padding-bottom: 1rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--primary);
    }
    /* 装饰性背景线条 */
    .hero-bg {
      background: linear-gradient(135deg, #1A1A1A 0%, #2D1B1B 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-bg::before {
      content: '';
      position: absolute;
      top: -20%;
      right: -10%;
      width: 60%;
      height: 120%;
      background: radial-gradient(circle, rgba(228,61,42,0.25) 0%, transparent 70%);
      border-radius: 50%;
    }
    .gold-dot {
      background-color: var(--gold);
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      margin-right: 8px;
      vertical-align: middle;
    }
    .decor-line {
      height: 4px;
      width: 40px;
      background-color: var(--primary);
      border-radius: 2px;
      margin: 0.75rem 0 1.5rem;
    }
    /* 移动端菜单 */
    #mobile-menu {
      display: none;
    }
    @media (max-width: 1023px) {
      #mobile-menu.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: #1A1A1A;
        padding: 1.5rem;
        gap: 1.25rem;
        border-top: 1px solid #333;
        z-index: 50;
      }
    }
    /* 价格卡不等高微调 */
    .price-card.recommended {
      transform: scale(1.02);
      border: 2px solid var(--primary);
      position: relative;
      z-index: 2;
    }
    @media (max-width: 640px) {
      .price-card.recommended {
        transform: none;
      }
    }