/* roulang page: index */
:root {
      --deep-blue: #1A2B5E;
      --flame-orange: #F04E23;
      --electric-cyan: #00C9D0;
      --dark-ink: #0F1A38;
      --warm-gray: #F8F9FB;
      --card-white: #FFFFFF;
      --text-primary: #0F1A38;
      --text-body: #3A4050;
      --text-muted: #6B7280;
      --border-light: #E5E7EB;
      --bg-alt: #EEF1F7;
    }
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      line-height: 1.7;
      color: var(--text-body);
      background-color: var(--warm-gray);
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, input, textarea {
      font-family: inherit;
      outline: none;
    }
    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (max-width: 768px) {
      .container {
        padding-left: 1rem;
        padding-right: 1rem;
      }
    }
    .section-padding {
      padding-top: 6rem;
      padding-bottom: 6rem;
    }
    @media (max-width: 768px) {
      .section-padding {
        padding-top: 4rem;
        padding-bottom: 4rem;
      }
    }
    .title-decor {
      width: 4px;
      height: 24px;
      background-color: var(--electric-cyan);
      display: inline-block;
      margin-right: 0.75rem;
      vertical-align: middle;
      border-radius: 2px;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover);
      border-color: rgba(26, 43, 94, 0.3);
      transition: all 0.25s ease;
    }
    .btn-primary {
      background-color: var(--flame-orange);
      color: white;
      border-radius: 8px;
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background-color: #D13E1A;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(240, 78, 35, 0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--deep-blue);
      color: var(--deep-blue);
      border-radius: 8px;
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: all 0.25s ease;
      display: inline-block;
      text-align: center;
    }
    .btn-outline:hover {
      background-color: var(--deep-blue);
      color: white;
    }
    .nav-link {
      position: relative;
      padding: 0.5rem 0.25rem;
      font-weight: 500;
      color: var(--text-body);
      transition: color 0.2s;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--deep-blue);
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 100%;
      height: 2px;
      background-color: var(--electric-cyan);
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
    }
    .faq-question {
      cursor: pointer;
      padding: 1.25rem 0;
      font-weight: 600;
      color: var(--text-primary);
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--deep-blue);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-body);
      line-height: 1.7;
      padding: 0 0;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 1.5rem;
    }
    .faq-icon {
      font-size: 1.5rem;
      color: var(--electric-cyan);
      transition: transform 0.2s;
    }
    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }
    @media (max-width: 768px) {
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 88px;
        left: 0;
        width: 100%;
        box-shadow: 0 10px 15px rgba(0,0,0,0.05);
        padding: 1rem 1.5rem;
        z-index: 40;
      }
      .mobile-menu.open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
    }
    .hamburger {
      display: none;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .hamburger {
        display: block;
      }
    }