/* roulang page: index */
:root {
      --deep-black: #0A0F1D;
      --race-red: #E62E2E;
      --electric-cyan: #00E5FF;
      --frost-white: #F5F7FA;
      --graphite: #2D3748;
      --light-gray: #E2E8F0;
      --white: #FFFFFF;
      --shadow-card: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
      --shadow-card-hover: 0 20px 25px rgba(0, 229, 255, 0.1);
      --radius-xl: 12px;
      --radius-2xl: 24px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: var(--frost-white);
      color: var(--graphite);
      line-height: 1.75;
      margin: 0;
      -webkit-font-smoothing: antialiased;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, input {
      font-family: inherit;
    }
    .container {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 768px) {
      .container {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    .bg-deep-black {
      background-color: var(--deep-black);
    }
    .text-race-red {
      color: var(--race-red);
    }
    .bg-race-red {
      background-color: var(--race-red);
    }
    .text-electric-cyan {
      color: var(--electric-cyan);
    }
    .bg-electric-cyan {
      background-color: var(--electric-cyan);
    }
    .border-electric-cyan {
      border-color: var(--electric-cyan);
    }
    .card {
      background: var(--white);
      border-radius: var(--radius-xl);
      border: 1px solid var(--light-gray);
      box-shadow: var(--shadow-card);
      transition: all 0.25s ease;
    }
    .card:hover {
      background: #F0FDFF;
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      border-color: rgba(0, 229, 255, 0.2);
    }
    .btn-primary {
      background: var(--race-red);
      color: white;
      border-radius: 8px;
      padding: 0.75rem 1.75rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 6px rgba(230,46,46,0.2);
    }
    .btn-primary:hover {
      background: #C41E1E;
      box-shadow: 0 0 15px rgba(230, 46, 46, 0.5);
      transform: translateY(-1px);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--electric-cyan);
      color: var(--electric-cyan);
      border-radius: 8px;
      padding: 0.7rem 1.75rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      cursor: pointer;
    }
    .btn-secondary:hover {
      background: var(--electric-cyan);
      color: var(--deep-black);
    }
    .nav-link {
      position: relative;
      font-weight: 500;
      transition: color 0.2s;
      padding: 0.5rem 0;
    }
    .nav-link:hover, .nav-link.active {
      color: var(--electric-cyan);
    }
    .search-input {
      background: #EDF2F7;
      border-radius: 24px;
      border: 1.5px solid transparent;
      padding: 0.6rem 1rem 0.6rem 2.5rem;
      outline: none;
      transition: all 0.2s;
      width: 100%;
    }
    .search-input:focus {
      border-color: var(--electric-cyan);
      box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.3);
      background: white;
    }
    .faq-item {
      border-bottom: 1px solid var(--light-gray);
    }
    .faq-question {
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.25rem 0;
      font-weight: 600;
      transition: color 0.2s;
    }
    .faq-question:hover {
      color: var(--race-red);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      padding: 0 0 0 1.5rem;
      color: var(--graphite);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 1.25rem;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-icon {
      transition: transform 0.3s ease;
      font-size: 1.5rem;
      line-height: 1;
    }
    @media (max-width: 767px) {
      .mobile-hidden {
        display: none;
      }
      .mobile-menu-open .mobile-hidden {
        display: block;
      }
    }