:root {
  --renk-ana: #1f4b99;
  --renk-vurgu: #f2a900;
  --renk-metin: #232323;
  --renk-acik: #f7f8fa;
  --renk-beyaz: #ffffff;
  --font-yazi: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-yazi);
  color: var(--renk-metin);
  background: var(--renk-beyaz);
  line-height: 1.6;
}

a { color: var(--renk-ana); text-decoration: none; }
a:hover { text-decoration: underline; }

.ust-menu {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: var(--renk-ana);
  color: var(--renk-beyaz);
  flex-wrap: wrap;
}

.ust-menu .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--renk-beyaz);
}

.ust-menu .logo:hover { text-decoration: none; }

.ust-menu nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.ust-menu nav a {
  color: var(--renk-beyaz);
  font-weight: 500;
}

.ust-menu nav a:hover { color: var(--renk-vurgu); }

.hero {
  background: linear-gradient(135deg, var(--renk-ana), #163a75);
  color: var(--renk-beyaz);
  padding: 64px 24px;
  text-align: center;
}

.hero h1 { font-size: 2.2rem; margin-bottom: 12px; }
.hero p { font-size: 1.1rem; max-width: 640px; margin: 0 auto 24px; }

.buton {
  display: inline-block;
  background: var(--renk-vurgu);
  color: var(--renk-metin);
  font-weight: 700;
  padding: 12px 28px;
  border-radius: 6px;
}

.buton:hover { text-decoration: none; opacity: 0.9; }

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 24px;
}

h2 {
  color: var(--renk-ana);
  border-bottom: 3px solid var(--renk-vurgu);
  display: inline-block;
  padding-bottom: 4px;
  margin-bottom: 24px;
}

.kart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.kart {
  background: var(--renk-acik);
  border-radius: 10px;
  padding: 20px;
  border: 1px solid #e3e6ec;
}

.kart h3 { margin-top: 0; color: var(--renk-ana); }

.video-kutu {
  aspect-ratio: 16 / 9;
  background: #ddd;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #777;
  font-size: 0.9rem;
  margin-bottom: 12px;
}

footer {
  background: #12274d;
  color: #cfd7e6;
  padding: 32px 24px;
  text-align: center;
  font-size: 0.9rem;
}

footer a { color: var(--renk-vurgu); }

footer .footer-linkler {
  margin-top: 12px;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.iletisim-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 480px;
}

.iletisim-form input,
.iletisim-form textarea {
  padding: 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-family: inherit;
  font-size: 1rem;
}

.uyari-kutu {
  background: #fff4e0;
  border: 1px solid var(--renk-vurgu);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 24px;
}