:root {
      --primary: rgb(80, 250, 123);
      --primary-hover: #3efc7d;
      --bg-dark: #070B19;
      --bg-surface: #0E162D;
      --bg-surface-hover: #151F3D;
      --ice-blue: #00D2FF;
      --text-white: #FFFFFF;
      --text-gray: #8F9CAE;
      --border-color: rgba(255, 255, 255, 0.08);
      --glacier-gradient: linear-gradient(135deg, #00D2FF 0%, #3B82F6 100%);
      --dark-gradient: linear-gradient(180deg, #070B19 0%, #0E162D 100%);
      --neon-glow: 0 0 20px rgba(80, 250, 123, 0.25);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-white);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.3s ease;
    }

    
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 70px;
      background: rgba(7, 11, 25, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      z-index: 1000;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 4%;
    }

    .logo {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }
    .logo img {
      display: block;
      height: 38px;
      width: auto;
      max-width: 160px;
      object-fit: contain;
      flex-shrink: 0;
    }
    .logo span {
      display: inline-block;
      font-size: 18px;
      font-weight: 800;
      line-height: 1;
      color: var(--text-white);
      white-space: nowrap;
      letter-spacing: 0.5px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 30px;
    }
    .nav-menu a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-gray);
    }
    .nav-menu a:hover {
      color: var(--primary);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .btn-action {
      background: var(--glacier-gradient);
      color: var(--bg-dark);
      font-weight: 600;
      padding: 8px 18px;
      border-radius: 6px;
      font-size: 14px;
      border: none;
      cursor: pointer;
    }
    .btn-action:hover {
      opacity: 0.9;
      box-shadow: 0 0 15px rgba(0, 210, 255, 0.4);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      color: var(--text-white);
      font-size: 24px;
      cursor: pointer;
    }

    
    .drawer-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.7);
      backdrop-filter: blur(4px);
      z-index: 2000;
      opacity: 0;
      visibility: hidden;
      transition: all 0.3s ease;
    }
    .drawer-overlay.active {
      opacity: 1;
      visibility: visible;
    }

    .drawer-content {
      position: fixed;
      top: 0;
      left: -300px;
      width: 300px;
      height: 100%;
      background: var(--bg-surface);
      border-right: 1px solid var(--border-color);
      z-index: 2001;
      padding: 30px 24px;
      display: flex;
      flex-direction: column;
      gap: 30px;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    .drawer-content.active {
      left: 0;
    }

    .drawer-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .drawer-close {
      background: none;
      border: none;
      color: var(--text-white);
      font-size: 28px;
      cursor: pointer;
    }

    .drawer-nav {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .drawer-nav a {
      font-size: 16px;
      color: var(--text-gray);
      font-weight: 500;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .drawer-nav a:hover {
      color: var(--primary);
    }

    
    .download-header {
      padding: 140px 4% 60px;
      background: radial-gradient(circle at 50% 30%, rgba(80, 250, 123, 0.1) 0%, rgba(7, 11, 25, 0) 60%), var(--bg-dark);
      text-align: center;
    }
    .dl-title {
      font-size: 40px;
      font-weight: 800;
    }
    .dl-subtitle {
      color: var(--text-gray);
      font-size: 18px;
      margin-top: 10px;
    }

    .download-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
      max-width: 1000px;
      margin: 0 auto;
      padding: 40px 4% 80px;
    }

    .dl-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 40px 30px;
      text-align: center;
      transition: all 0.3s;
    }
    .dl-card:hover {
      transform: translateY(-5px);
      border-color: var(--primary);
    }
    .dl-icon {
      font-size: 48px;
      margin-bottom: 20px;
    }
    .dl-card-title {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .dl-card-desc {
      color: var(--text-gray);
      font-size: 14px;
      margin-bottom: 30px;
    }
    .dl-btn {
      display: block;
      background: var(--primary);
      color: var(--bg-dark);
      padding: 12px;
      font-weight: 700;
      border-radius: 8px;
      margin-bottom: 15px;
    }
    .dl-btn:hover {
      background: var(--primary-hover);
    }
    .dl-meta {
      font-size: 12px;
      color: var(--text-gray);
    }

    
    .tutorial-section {
      background: rgba(14, 22, 45, 0.3);
      padding: 80px 4%;
    }
    .container {
      max-width: 1000px;
      margin: 0 auto;
    }
    .tut-title {
      font-size: 28px;
      text-align: center;
      margin-bottom: 50px;
    }
    .tut-list {
      display: flex;
      flex-direction: column;
      gap: 30px;
    }
    .tut-step {
      display: flex;
      gap: 30px;
      align-items: center;
    }
    .tut-num {
      width: 50px;
      height: 50px;
      background: rgba(0, 210, 255, 0.1);
      border: 1px solid var(--ice-blue);
      color: var(--ice-blue);
      font-size: 20px;
      font-weight: 800;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    .tut-info h3 {
      font-size: 18px;
      margin-bottom: 5px;
    }
    .tut-info p {
      color: var(--text-gray);
      font-size: 14px;
    }

    
    .footer {
      background: #040711;
      border-top: 1px solid var(--border-color);
      padding: 60px 4% 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr repeat(3, 1fr);
      gap: 40px;
      max-width: 1200px;
      margin: 0 auto 50px;
    }
    .footer-brand {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .footer-brand .logo img {
      height: 34px;
    }
    .footer-brand p {
      font-size: 14px;
      color: var(--text-gray);
      line-height: 1.6;
    }
    .footer-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-white);
      margin-bottom: 20px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 12px;
    }
    .footer-links a {
      font-size: 14px;
      color: var(--text-gray);
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      max-width: 1200px;
      margin: 0 auto;
      flex-wrap: wrap;
      gap: 20px;
      font-size: 13px;
      color: var(--text-gray);
    }

    @media (max-width: 768px) {
      .nav-menu, .header-actions .btn-action {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .tut-step {
        flex-direction: column;
        text-align: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }