/* roulang page: index */
:root {
      --deep-ocean: #0A1A2F;
      --champagne-gold: #C9A96E;
      --coral-orange: #E07B5A;
      --warm-porcelain: #F9F7F2;
      --soft-gray-brown: #F4F1EA;
      --charcoal: #2C3E50;
      --white-mist: rgba(249, 247, 242, 0.95);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-elevated: 0 12px 30px rgba(0,0,0,0.08);
      --gold-glow: 0 0 15px rgba(201,169,110,0.5);
      --border-radius-card: 20px;
      --border-radius-btn: 50px;
      --transition-smooth: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: 'Inter', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      background-color: var(--warm-porcelain);
      color: var(--deep-ocean);
      line-height: 1.7;
    }
    h1, h2, h3, h4 {
      margin-top: 0;
      letter-spacing: -0.3px;
    }
    h1 {
      font-size: clamp(2.5rem, 8vw, 4.2rem);
      font-weight: 700;
      line-height: 1.2;
    }
    h2 {
      font-size: clamp(1.8rem, 6vw, 2.8rem);
      font-weight: 600;
      line-height: 1.3;
    }
    h3 {
      font-size: 1.4rem;
      font-weight: 600;
    }
    .section-padding {
      padding: 5rem 1.5rem;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding: 3rem 1rem;
      }
    }
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* 导航 */
    .navbar {
      background: rgba(10, 26, 47, 0.92);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--champagne-gold);
      position: sticky;
      top: 0;
      z-index: 50;
    }
    .nav-link {
      color: var(--warm-porcelain);
      transition: color var(--transition-smooth);
      font-weight: 500;
    }
    .nav-link:hover {
      color: var(--champagne-gold);
    }
    .logo-text {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--champagne-gold);
      letter-spacing: 0.5px;
    }
    .mega-trigger {
      position: relative;
      cursor: pointer;
    }
    .mega-panel {
      display: none;
      position: absolute;
      top: 100%;
      right: 0;
      background: var(--warm-porcelain);
      border-radius: 20px;
      box-shadow: var(--shadow-elevated);
      padding: 1.8rem;
      grid-template-columns: repeat(4, 1fr);
      gap: 1.2rem;
      min-width: 560px;
      z-index: 55;
      border: 1px solid rgba(201,169,110,0.3);
    }
    .mega-trigger:hover .mega-panel,
    .mega-trigger:focus-within .mega-panel {
      display: grid;
    }
    @media (max-width: 768px) {
      .mega-panel {
        min-width: auto;
        grid-template-columns: 1fr 1fr;
      }
    }
    .mega-card {
      background: white;
      border-radius: 14px;
      padding: 0.8rem;
      transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
    }
    .mega-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-elevated);
    }
    /* 汉堡菜单 */
    #mobile-menu {
      display: none;
    }
    .mobile-nav-links {
      display: none;
    }
    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      #mobile-menu:checked ~ .mobile-nav-links {
        display: flex;
        flex-direction: column;
        background: var(--deep-ocean);
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        padding: 1.5rem;
        gap: 1.2rem;
      }
    }
    /* 按钮 */
    .btn-primary {
      background: var(--champagne-gold);
      color: var(--deep-ocean);
      border-radius: var(--border-radius-btn);
      padding: 0.8rem 2.2rem;
      font-weight: 600;
      display: inline-block;
      border: none;
      transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #D4B87A;
      box-shadow: var(--gold-glow);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--champagne-gold);
      color: var(--champagne-gold);
      border-radius: var(--border-radius-btn);
      padding: 0.7rem 2rem;
      font-weight: 600;
      transition: all var(--transition-smooth);
    }
    .btn-outline:hover {
      background: var(--champagne-gold);
      color: var(--deep-ocean);
    }
    .card {
      background: var(--warm-porcelain);
      border-radius: var(--border-radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
    }
    .card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-elevated);
    }
    .accent-text {
      color: var(--champagne-gold);
    }
    .badge-float {
      background: rgba(10,26,47,0.9);
      color: white;
      border-radius: 50px;
      padding: 0.4rem 1.4rem;
      backdrop-filter: blur(8px);
    }
    .faq-item {
      background: var(--warm-porcelain);
      border-radius: 14px;
      margin-bottom: 1rem;
      overflow: hidden;
    }
    .faq-question {
      background: transparent;
      width: 100%;
      text-align: left;
      padding: 1.2rem;
      font-weight: 600;
      color: var(--champagne-gold);
      display: flex;
      justify-content: space-between;
      align-items: center;
      border: none;
      cursor: pointer;
    }
    .faq-answer {
      padding: 0 1.2rem 1.2rem;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .footer-link {
      color: var(--warm-porcelain);
      transition: color var(--transition-smooth);
    }
    .footer-link:hover {
      color: var(--champagne-gold);
    }