/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #F97316;
      --accent-hover: #EA580C;
      --bg-light: #F8FAFC;
      --bg-dark: #1E293B;
      --card-bg: #FFFFFF;
      --border-light: #E2E8F0;
      --text-primary: #0F172A;
      --text-secondary: #475569;
      --text-light: #F8FAFC;
      --shadow-sm: 0 4px 12px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.12);
      --radius-md: 12px;
      --radius-sm: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --transition: 0.2s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-primary);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.06);
      z-index: 50;
      padding: 14px 0;
    }

    .nav-logo {
      font-weight: 800;
      font-size: 1.5rem;
      color: var(--primary);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .badge-pulse {
      display: inline-flex;
      align-items: center;
      background: #DC2626;
      color: white;
      font-size: 0.7rem;
      font-weight: 700;
      padding: 3px 12px;
      border-radius: 9999px;
      animation: softPulse 2s infinite;
      letter-spacing: 0.3px;
      white-space: nowrap;
    }

    @keyframes softPulse {
      0% { box-shadow: 0 0 0 0 rgba(220, 38, 38, 0.5); }
      70% { box-shadow: 0 0 0 8px rgba(220, 38, 38, 0); }
      100% { box-shadow: 0 0 0 0 rgba(220, 38, 38, 0); }
    }

    .nav-link {
      font-weight: 500;
      color: var(--text-secondary);
      padding: 6px 4px;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
      font-size: 0.95rem;
    }
    .nav-link:hover {
      color: var(--primary);
      border-bottom-color: var(--accent);
    }

    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      box-shadow: 0 4px 10px rgba(249, 115, 22, 0.3);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      box-shadow: 0 6px 16px rgba(249, 115, 22, 0.4);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid white;
      color: white;
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-outline:hover {
      background: rgba(255,255,255,0.15);
      border-color: white;
    }

    .btn-outline-dark {
      border-color: var(--primary);
      color: var(--primary);
    }
    .btn-outline-dark:hover {
      background: rgba(15,23,42,0.05);
    }

    /* 卡片样式 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .hamburger-menu {
      display: none;
    }

    @media (max-width: 768px) {
      .desktop-nav {
        display: none;
      }
      .hamburger-menu {
        display: block;
      }
      .mobile-menu-active {
        display: flex;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
      }
    }

    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      font-weight: 600;
      padding: 18px 0;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #F1F5F9;
      border-radius: 0 0 8px 8px;
      padding: 0 16px;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }

    /* 装饰用数字/线条 */
    .accent-border-left {
      border-left: 4px solid var(--accent);
      padding-left: 20px;
    }

@keyframes float {
          0% { transform: translateY(0px); }
          50% { transform: translateY(-10px); }
          100% { transform: translateY(0px); }
        }