:root {
  --zemin: #f4f5f7;
  --kutu: #ffffff;
  --metin: #1d2330;
  --soluk: #5b6474;
  --vurgu: #1565c0;
  --kirmizi: #c62828;
  --cizgi: #dde1e7;
  color-scheme: light;
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.45 system-ui, "Segoe UI", Roboto, sans-serif; background: var(--zemin); color: var(--metin); }
[hidden] { display: none !important; }
.ust { display: flex; align-items: center; gap: 0.75rem; padding: 0.7rem 1rem; background: var(--kutu); border-bottom: 1px solid var(--cizgi); }
.ust strong { flex: 1; }
.kim { color: var(--soluk); font-size: 0.9rem; }
main { max-width: 980px; margin: 0 auto; padding: 1rem; }
.kutu { background: var(--kutu); border: 1px solid var(--cizgi); border-radius: 10px; padding: 1rem 1.1rem; margin-bottom: 1rem; }
.dar { max-width: 380px; margin: 3rem auto; }
h1 { font-size: 1.25rem; margin: 0 0 0.6rem; }
h2 { font-size: 1.1rem; margin: 0; }
.aciklama { color: var(--soluk); font-size: 0.9rem; margin: 0 0 0.9rem; }
form { display: grid; gap: 0.8rem; }
label { display: grid; gap: 0.3rem; font-weight: 600; font-size: 0.92rem; }
input { font: inherit; padding: 0.6rem 0.7rem; border: 1px solid #b9c0cc; border-radius: 7px; width: 100%; }
input:focus { outline: 2px solid var(--vurgu); outline-offset: 1px; }
.yan { display: flex; gap: 0.5rem; }
.yan input { flex: 1; }
button { font: inherit; font-weight: 600; padding: 0.6rem 1rem; border: 0; border-radius: 7px; background: var(--vurgu); color: #fff; cursor: pointer; }
button:disabled { background: #9aa5b5; cursor: not-allowed; }
button.ikincil { background: #e8ebf0; color: var(--metin); }
.hata { color: var(--kirmizi); font-weight: 600; margin: 0; min-height: 1.2em; }
.uyarilar { margin: 0; padding-left: 1.2rem; color: #a15c00; font-size: 0.88rem; }
.uyarilar:empty { display: none; }
.sonuc { margin-bottom: 1rem; }
.sonuc-ust { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; margin-bottom: 0.4rem; }
.sonuc-ust span { display: flex; gap: 0.5rem; }
.kodlar { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem; }
.kod-kart { background: #fff; border: 1px solid var(--cizgi); border-radius: 10px; padding: 0.9rem; text-align: center; }
.kod-kart h3 { margin: 0 0 0.5rem; font-size: 1.5rem; }
.kod-kart .qr svg { width: 100%; max-width: 260px; height: auto; display: block; margin: 0 auto; }
.kod-kart p { margin: 0.4rem 0 0; font-size: 0.9rem; }
.kod-kart .iz { color: var(--soluk); font-size: 0.78rem; }
table { width: 100%; border-collapse: collapse; font-size: 0.85rem; margin-top: 0.6rem; }
th, td { text-align: left; padding: 0.35rem 0.4rem; border-bottom: 1px solid var(--cizgi); }
summary { cursor: pointer; font-weight: 600; }
@media (max-width: 560px) { .dar { margin: 1.5rem auto; } main { padding: 0.6rem; } }
@media print {
  .ust, #uygulama > .kutu, #gecmis-kutu, .sonuc-ust span, .sonuc > .aciklama { display: none !important; }
  body { background: #fff; }
  main { padding: 0; max-width: none; }
  .kodlar { grid-template-columns: repeat(2, 1fr); gap: 8mm; }
  .kod-kart { break-inside: avoid; border: 1px dashed #999; }
  .kod-kart .qr svg { max-width: 70mm; }
}