body {
      scroll-behavior: smooth;
    }

    header {
    background: linear-gradient(135deg, #0f172a, #1e3a8a, #2563eb);
    color: #fff;
    min-height: 80vh; /* daha hündür görünüş */
    display: flex;
    align-items: center;
    text-align: center;
    position: relative;
    }

    header::after {
    content: "";
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.3); /* yüngül overlay effekti */
    }

    header .container {
    position: relative;
    z-index: 2;
    }
    section {
      padding: 80px 0;
    }
    .section-title {
      margin-bottom: 50px;
    }
    footer {
      background: #0f172a;
      color: #ccc;
      padding: 40px 0;
    }
    .nav-link {
      color: #fff;
    }
    footer a { color: #ccc; text-decoration: none; }
    footer a:hover { color: #fff; }