:root {
      --primary-color: rgb(124, 58, 237);
      --primary-hover: rgb(109, 40, 217);
      --text-dark: #111827;
      --text-muted: #4b5563;
      --bg-light: #f9fafb;
      --border-color: #e5e7eb;
      --transition: all 0.3s ease;
      --max-width: 1200px;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; color: var(--text-dark); background-color: #fff; line-height: 1.6; }
    a { color: inherit; text-decoration: none; transition: var(--transition); }
    img { max-width: 100%; height: auto; }
    .container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

    
    .logo { display: inline-flex; align-items: center; gap: 12px; }
    .logo img { height: 40px; width: auto; max-width: 160px; object-fit: contain; }
    .logo span { font-size: 20px; font-weight: 800; color: var(--text-dark); }

    
    header { background-color: #fff; border-bottom: 1px solid var(--border-color); position: sticky; top: 0; z-index: 1000; }
    .header-container { display: flex; justify-content: space-between; align-items: center; height: 70px; }
    .nav-menu { display: flex; gap: 30px; align-items: center; }
    .nav-menu a { font-weight: 500; color: var(--text-muted); font-size: 15px; }
    .nav-menu a:hover { color: var(--primary-color); }
    .mobile-menu-btn { display: none; background: none; border: none; cursor: pointer; }
    .mobile-menu-btn svg { width: 24px; height: 24px; fill: var(--text-dark); }

    
    .drawer-mask { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); z-index: 1001; opacity: 0; pointer-events: none; transition: var(--transition); }
    .drawer-mask.active { opacity: 1; pointer-events: auto; }
    .mobile-drawer { position: fixed; top: 0; left: -300px; width: 300px; height: 100%; background: #fff; z-index: 1002; box-shadow: 5px 0 25px rgba(0,0,0,0.15); transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1); display: flex; flex-direction: column; padding: 20px; }
    .mobile-drawer.active { transform: translateX(300px); }
    .drawer-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; border-bottom: 1px solid var(--border-color); padding-bottom: 15px; }
    .drawer-close { background: none; border: none; cursor: pointer; }
    .drawer-close svg { width: 20px; height: 20px; }
    .drawer-nav { display: flex; flex-direction: column; gap: 20px; overflow-y: auto; flex: 1; }
    .drawer-nav a { font-size: 16px; font-weight: 500; color: var(--text-dark); padding: 10px 0; border-bottom: 1px solid #f3f4f6; }

    
    .about-banner {
      background-color: #0b0f19;
      color: #fff;
      padding: 80px 0;
      text-align: center;
    }
    .about-content {
      padding: 80px 0;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .about-text h2 {
      font-size: 32px;
      font-weight: 800;
      margin-bottom: 20px;
    }
    .about-text p {
      color: var(--text-muted);
      margin-bottom: 20px;
      font-size: 16px;
    }
    .badge-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 30px;
    }
    .badge-card {
      background: var(--bg-light);
      padding: 20px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }
    .badge-card h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .badge-card p {
      font-size: 13px;
      color: var(--text-muted);
      margin: 0;
    }

    
    .timeline-section {
      background: var(--bg-light);
      padding: 80px 0;
    }
    .timeline {
      max-width: 800px;
      margin: 40px auto 0;
      position: relative;
    }
    .timeline::before {
      content: '';
      position: absolute;
      left: 50%;
      width: 2px;
      height: 100%;
      background: var(--border-color);
    }
    .timeline-item {
      margin-bottom: 40px;
      position: relative;
    }
    .timeline-content {
      width: 45%;
      background: #fff;
      padding: 20px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }
    .timeline-item:nth-child(even) .timeline-content {
      margin-left: auto;
    }
    .timeline-date {
      color: var(--primary-color);
      font-weight: 700;
      font-size: 14px;
      margin-bottom: 5px;
    }

    
    footer { background-color: #0b0f19; color: #9ca3af; padding: 60px 0 30px; border-top: 1px solid rgba(255,255,255,0.1); }
    .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
    .footer-brand .logo span { color: #fff; }
    .footer-desc { margin-top: 15px; font-size: 14px; }
    .footer-title { color: #fff; font-size: 16px; font-weight: 700; margin-bottom: 20px; }
    .footer-links { list-style: none; }
    .footer-links li { margin-bottom: 12px; }
    .footer-links a { font-size: 14px; }
    .footer-links a:hover { color: var(--primary-color); }
    .footer-bottom { border-top: 1px solid rgba(255,255,255,0.05); padding-top: 20px; display: flex; justify-content: space-between; align-items: center; font-size: 13px; }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .mobile-menu-btn { display: block; }
      .grid-2 { grid-template-columns: 1fr; }
      .timeline::before { left: 20px; }
      .timeline-content { width: calc(100% - 40px); margin-left: 40px !important; }
      .footer-grid { grid-template-columns: 1fr; }
    }