.navbar {
      background: #0b0b0b;
      padding: 1rem 2rem;
      position: sticky;
      top: 0;
      z-index: 1000;
    }

    .navbar ul {
      margin: 0;
      padding: 0;
      display: flex;
      justify-content: center;
      align-items: center;
      list-style: none;
      gap: 2rem;
    }

    .navbar li {
      display: flex;
      align-items: center;
    }

    .navbar a {
      color: white;
      text-decoration: none;
      font-weight: bold;
      font-size: 1rem;
      transition: color 0.3s ease;
    }

    .navbar a:hover {
      color: #ffd700;
    }
    .navbar a.active {
      border-bottom: 3px solid #ffd700;
      color: #ffd700;
    }

    html, body {
      margin: 0;
      padding: 0;
    }

    body {
      background-image: url('../../image/city1.jpeg');
      background-size: cover;
      background-position: center;
      background-attachment: fixed;
      font-family: 'Helvetica Neue', sans-serif;
      color: #333;
    }

    .tetris-container {
      max-width: 1000px;
      margin: 60px auto;
      background: rgba(26, 26, 26, 0.95);
      padding: 50px 40px;
      box-shadow: 0 8px 32px rgba(0,0,0,0.3);
      border-radius: 16px;
      color: #fff;
    }

    .tetris-hero {
      text-align: center;
      margin-bottom: 50px;
    }

    .tetris-title-img {
      max-width: 750px;
      width: 100%;
      height: auto;
      margin-bottom: 15px;
    }

    .tetris-hero p {
      font-size: 1.2rem;
      color: #ccc;
      margin-top: 10px;
    }

    .tetris-showcase {
      display: flex;
      gap: 40px;
      align-items: center;
      margin-bottom: 60px;
    }

    .tetris-game-img-wrapper {
      flex: 1;
      text-align: center;
    }
    
    .tetris-game-img {
      max-width: 100%;
      height: auto;
      border-radius: 12px;
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
      border: 2px solid #444;
    }

    .tetris-brief {
      flex: 1;
    }
    .tetris-brief h3 {
      font-size: 1.8rem;
      color: #ffd700;
      margin-top: 0;
      margin-bottom: 20px;
    }
    .tetris-brief p {
      font-size: 1.05rem;
      line-height: 1.7;
      color: #ddd;
    }

    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 40px;
    }
    .feature-card {
      background: rgba(255, 255, 255, 0.05);
      padding: 25px;
      border-radius: 8px;
      border-top: 4px solid #b71c1c;
      transition: transform 0.3s ease;
    }
    .feature-card:hover {
      transform: translateY(-5px);
    }
    .feature-card h4 {
      font-size: 1.2rem;
      color: #fff;
      margin-top: 0;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .feature-card p {
      font-size: 0.95rem;
      color: #bbb;
      line-height: 1.6;
      margin: 0;
    }

    .download-cta {
      text-align: center;
      margin-top: 60px;
      padding-top: 40px;
      border-top: 1px solid #333;
    }
    .download-btn {
      display: inline-block;
      padding: 15px 40px;
      background-color: #b71c1c;
      color: white;
      font-size: 1.1rem;
      font-weight: bold;
      text-decoration: none;
      border-radius: 30px;
      transition: background 0.3s;
      box-shadow: 0 4px 15px rgba(183, 28, 28, 0.4);
    }
    .download-btn:hover {
      background-color: #9a1414;
    }

    footer {
      text-align: left;
      padding: 0;
      background: #bdc3c7;
      font-size: 0.9rem;
      margin: 0;
    }

    @media (max-width: 768px) {
      .navbar ul {
        display: none;
        flex-direction: column;
        align-items: flex-start;
        background: #b71c1c;
        width: 100%;
        padding: 1.5rem 1.5rem 2rem;
        gap: 1.2rem;
        position: absolute;
        top: 3.8rem;
        left: 0;
        z-index: 1000;
        box-sizing: border-box;
      }
      .navbar ul.open {
        display: flex;
        height: auto;
        max-height: 100vh;
        overflow-y: auto;
      }
      .tetris-container {
        margin: 30px 15px;
        padding: 30px 20px;
      }
      .tetris-showcase {
        flex-direction: column;
        gap: 30px;
      }
      .features-grid {
        grid-template-columns: 1fr;
        gap: 15px;
      }
      footer div[style*="max-width: 1000px"] {
        padding: 1rem;
      }
    }
  

    .hamburger {
      width: 2rem;
      height: 1.5rem;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      cursor: pointer;
      position: absolute;
      top: 1rem;
      right: 1.5rem;
      z-index: 1001;
    }
    .hamburger span {
      height: 3px;
      background: white;
      border-radius: 2px;
      transition: all 0.4s ease;
      position: relative;
      display: block;
    }
    .hamburger.opened span:nth-child(1),
    .hamburger.opened span:nth-child(3) {
      transform-origin: center;
      position: absolute;
      top: 50%; left: 0; right: 0;
      margin: auto;
    }
    .hamburger.opened span:nth-child(1) { transform: rotate(45deg); }
    .hamburger.opened span:nth-child(2) { opacity: 0; }
    .hamburger.opened span:nth-child(3) { transform: rotate(-45deg); }

    .nav-overlay {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0, 0, 0, 0.5);
      backdrop-filter: blur(4px);
      z-index: 999;
      display: none;
    }
    .nav-overlay.open { display: block; }