/* roulang page: index */
:root {
      --primary: #E8451E;
      --primary-dark: #1A1A2E;
      --accent: #FFB800;
      --bg: #F8F8FA;
      --card: #FFFFFF;
      --radius: 20px;
      --shadow-card: 0 8px 30px rgba(0,0,0,0.06);
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: #1A1A2E;
      line-height: 1.7;
      scroll-behavior: smooth;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    /* 导航 */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      height: 72px;
      display: flex;
      align-items: center;
      transition: box-shadow 0.3s;
    }
    .navbar.shadow {
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    .nav-logo {
      font-weight: 800;
      font-size: 1.8rem;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }
    .nav-logo span {
      color: var(--primary);
    }
    .nav-link {
      font-weight: 500;
      color: #1A1A2E;
      margin: 0 0.5rem;
      padding: 0.5rem 0.8rem;
      border-radius: 40px;
      transition: 0.2s;
      position: relative;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 4px;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 3px;
      background: var(--primary);
      border-radius: 3px;
      transition: width 0.3s;
    }
    .nav-link:hover::after {
      width: 60%;
    }
    /* 汉堡菜单 */
    .mobile-menu {
      display: none;
      position: fixed;
      top:0;left:0;right:0;bottom:0;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(20px);
      z-index: 100;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2rem;
      font-size: 2rem;
      font-weight: 700;
    }
    .mobile-menu a {
      color: var(--primary-dark);
    }
    .close-btn {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 2.2rem;
      cursor: pointer;
    }
    /* 按钮 */
    .btn-primary {
      background: linear-gradient(135deg, #E8451E, #FF6B35);
      color: white;
      font-weight: 600;
      padding: 0.8rem 2.2rem;
      border-radius: 50px;
      border: none;
      cursor: pointer;
      transition: all 0.25s;
      display: inline-block;
    }
    .btn-primary:hover {
      filter: brightness(1.08);
      transform: scale(1.02);
    }
    .btn-outline {
      background: white;
      border: 2px solid var(--primary);
      color: var(--primary);
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: 50px;
      transition: 0.25s;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .card {
      background: var(--card);
      border-radius: var(--radius);
      box-shadow: var(--shadow-card);
      transition: transform 0.3s, box-shadow 0.3s;
    }
    .card:hover {
      transform: translateY(-8px);
      box-shadow: 0 16px 40px rgba(232,69,30,0.15);
    }
    .badge-gold {
      background: linear-gradient(135deg, #FFB800, #FFA500);
      color: white;
      font-weight: 800;
      padding: 0.3rem 1.2rem;
      border-radius: 30px;
      animation: pulse 2s infinite;
    }
    @keyframes pulse {
      0%{box-shadow:0 0 0 0 rgba(255,184,0,0.6);}
      70%{box-shadow:0 0 0 12px rgba(255,184,0,0);}
      100%{box-shadow:0 0 0 0 rgba(255,184,0,0);}
    }
    .faq-item {
      background: white;
      border-radius: 16px;
      padding: 1.2rem 1.8rem;
      margin-bottom: 1rem;
      box-shadow: 0 4px 12px rgba(0,0,0,0.04);
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 700;
      margin-bottom: 0.8rem;
      color: var(--primary-dark);
    }
    @media (max-width: 768px) {
      .section-title {
        font-size: 1.8rem;
      }
    }