/* roulang page: index */
:root {
      --deep-space: #1B1F3B;
      --starlight-silver: #E8ECF1;
      --aurora-cyan: #00C9B6;
      --stardust-gold: #F4B740;
      --deep-ink: #0F1221;
      --text-night: #2C3144;
      --text-nebula: #6B7194;
      --border-dust: #D1D6E4;
      --card-bg: #FFFFFF;
      --soft-silver: #F7F9FC;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-container: 16px;
      --shadow-card: 0 4px 20px rgba(27,31,59,0.06);
      --shadow-hover: 0 8px 30px rgba(27,31,59,0.12);
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'Inter', sans-serif;
      margin: 0;
      line-height: 1.75;
      color: var(--text-night);
      background-color: #fff;
      -webkit-font-smoothing: antialiased;
    }
    .font-data {
      font-family: 'Inter', 'SF Mono', 'PingFang SC', monospace;
      font-weight: 500;
    }
    .container-main {
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }
    @media (min-width: 1024px) {
      .container-main {
        padding-left: 2rem;
        padding-right: 2rem;
      }
    }
    .section-padding {
      padding-top: 5rem;
      padding-bottom: 5rem;
    }
    @media (min-width: 768px) {
      .section-padding {
        padding-top: 7rem;
        padding-bottom: 7rem;
      }
    }
    .h2-decor {
      position: relative;
      padding-left: 1.25rem;
    }
    .h2-decor::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0.25rem;
      bottom: 0.25rem;
      width: 4px;
      background-color: var(--aurora-cyan);
      border-radius: 2px;
    }
    .card-hover {
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(0,201,182,0.25);
    }
    .btn-primary {
      background-color: var(--aurora-cyan);
      color: var(--deep-ink);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.75rem;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-primary:hover {
      background-color: #00B3A2;
      box-shadow: 0 10px 25px -5px rgba(0,201,182,0.4);
      transform: scale(1.02);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--aurora-cyan);
      color: var(--aurora-cyan);
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 0.75rem 1.75rem;
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
    }
    .btn-outline:hover {
      background-color: rgba(0,201,182,0.08);
      border-color: #00B3A2;
      color: #00B3A2;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
    }
    .faq-item.active .faq-indicator {
      transform: rotate(180deg);
      color: var(--aurora-cyan);
    }
    .mobile-menu {
      transition: opacity 0.3s ease, transform 0.3s ease;
      opacity: 0;
      transform: translateY(-10px);
      pointer-events: none;
    }
    .mobile-menu.open {
      opacity: 1;
      transform: translateY(0);
      pointer-events: auto;
    }
    .particle {
      position: absolute;
      background: white;
      border-radius: 50%;
      opacity: 0.15;
      animation: float 12s infinite alternate;
    }
    @keyframes float {
      0% { transform: translateY(0px) scale(1); }
      100% { transform: translateY(-30px) scale(1.3); opacity: 0.3; }
    }
    .bg-grid {
      background-image: linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }
    input:focus, textarea:focus {
      outline: none;
      border-color: var(--aurora-cyan);
      box-shadow: 0 0 0 3px rgba(0,201,182,0.25);
    }
    @media (max-width: 767px) {
      .hero-stats-mobile {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 0.75rem;
      }
    }