/* roulang page: index */
:root {
      --color-primary: #0B192C;
      --color-interaction: #0056D2;
      --color-accent: #00C853;
      --color-orange: #FF6B00;
      --color-bg-light: #F8FAFC;
      --color-surface: #FFFFFF;
      --color-text-main: #0F172A;
      --color-text-muted: #475569;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --radius-xl: 24px;
      --shadow-soft: 0 10px 25px -5px rgba(11, 25, 44, 0.05), 0 8px 10px -6px rgba(11, 25, 44, 0.04);
      --shadow-hover: 0 20px 30px -10px rgba(0, 86, 210, 0.12), 0 10px 15px -5px rgba(0, 0, 0, 0.05);
    }
    *, *::before, *::after {
      box-sizing: border-box;
    }
    body {
      background-color: var(--color-bg-light);
      color: var(--color-text-main);
      font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.7;
      overflow-x: hidden;
    }
    .custom-container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.25rem;
      padding-right: 1.25rem;
    }
    @media (min-width: 768px) {
      .custom-container {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    .nav-blur-bg {
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      background-color: rgba(255, 255, 255, 0.95);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    }
    .glass-card-dark {
      background: rgba(15, 23, 42, 0.75);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.1);
    }
    .gradient-hero-mask {
      background: linear-gradient(135deg, rgba(11, 25, 44, 0.94) 0%, rgba(15, 23, 42, 0.88) 100%);
    }
    .btn-primary {
      background-color: var(--color-orange);
      color: #ffffff;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .btn-primary:hover {
      background-color: #E65A00;
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(255, 107, 0, 0.25);
    }
    .btn-secondary {
      background-color: transparent;
      border: 1px solid rgba(255, 255, 255, 0.4);
      color: #ffffff;
      transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .btn-secondary:hover {
      background-color: rgba(255, 255, 255, 0.12);
      border-color: #ffffff;
    }
    .card-transition {
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    }
    .card-transition:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .faq-content {
      transition: max-height 0.35s ease-out, opacity 0.3s ease;
      max-height: 0;
      overflow: hidden;
      opacity: 0;
    }
    .faq-item.active .faq-content {
      max-height: 300px;
      opacity: 1;
    }
    .faq-item.active .faq-chevron {
      transform: rotate(180deg);
    }