:root {
  --zemin: #f4f6f9;
  --kart: #ffffff;
  --metin: #1b2733;
  --soluk: #5d6b7a;
  --cizgi: #dde3ea;
  --ana: #14324f;
  --vurgu: #1d6fb8;
  --vurgu-acik: #e6f0fa;
  --altin: #c99a2e;
  --dogru: #1f8a4c;
  --dogru-acik: #e3f4ea;
  --yanlis: #c0392b;
  --yanlis-acik: #fbe7e5;
  --golge: 0 1px 2px rgba(20, 50, 79, .06), 0 4px 14px rgba(20, 50, 79, .07);
  --yaricap: 14px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-tema="acik"]) {
    --zemin: #0f1720; --kart: #17222e; --metin: #e6edf3; --soluk: #9aa8b6; --cizgi: #2a3846;
    --ana: #0b1c2c; --vurgu: #5aa5e6; --vurgu-acik: #1b3044; --dogru-acik: #15301f; --yanlis-acik: #3a1d1a;
    --golge: 0 1px 2px rgba(0,0,0,.3);
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  background: var(--zemin); color: var(--metin);
  font-size: 16px; line-height: 1.5;
  padding-bottom: calc(68px + env(safe-area-inset-bottom));
  -webkit-tap-highlight-color: transparent;
}
button { font: inherit; color: inherit; cursor: pointer; }
a { color: var(--vurgu); }

/* Üst çubuk */
.ust {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 10px;
  background: var(--ana); color: #fff; padding: 10px 16px; min-height: 56px;
}
.marka { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; letter-spacing: .2px; cursor: pointer; }
.geri { background: none; border: 0; color: #fff; font-size: 30px; line-height: 1; padding: 0 6px 4px 0; }
.ust-sag { margin-left: auto; display: flex; align-items: center; gap: 8px; font-size: 14px; }
.rozet-pro { background: var(--altin); color: #1b1300; padding: 3px 10px; border-radius: 99px; font-weight: 700; font-size: 12px; border: 0; }

.rozet-pro.giris { background: #fff; color: var(--ana); }
.marka { min-width: 0; }
.marka span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.rozet-pro { white-space: nowrap; }
@media (max-width: 420px) { .marka span { font-size: 16px; } .ust { gap: 8px; padding: 10px 12px; } .rozet-pro { padding: 4px 9px; } }
.avatar { width: 34px; height: 34px; border-radius: 50%; border: 0; background: rgba(255,255,255,.16); display: grid; place-items: center; font-size: 17px; padding: 0; flex: none; }
.avatar.buyuk { width: 48px; height: 48px; font-size: 24px; background: var(--vurgu-acik); }

main { max-width: 860px; margin: 0 auto; padding: 16px; outline: none; }

/* Alt menü */
.alt {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 20;
  display: grid; grid-template-columns: repeat(5, 1fr);
  background: var(--kart); border-top: 1px solid var(--cizgi);
  padding-bottom: env(safe-area-inset-bottom);
}
.alt button {
  background: none; border: 0; padding: 7px 2px 8px; font-size: 11.5px; color: var(--soluk);
  display: flex; flex-direction: column; align-items: center; gap: 1px; min-height: 58px;
}
.alt button span { font-size: 20px; }
.alt button.secili { color: var(--vurgu); font-weight: 700; }
body.sinavda .alt { display: none; }
body.sinavda { padding-bottom: 0; }

/* Genel */
h1 { font-size: 22px; margin: 4px 0 12px; }
h2 { font-size: 18px; margin: 22px 0 10px; }
.soluk { color: var(--soluk); }
.kucuk { font-size: 14px; }
.kart {
  background: var(--kart); border-radius: var(--yaricap); box-shadow: var(--golge);
  padding: 16px; margin-bottom: 12px; border: 1px solid var(--cizgi);
}
.izgara { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 0; border-radius: 10px; padding: 11px 18px; min-height: 44px;
  background: var(--vurgu); color: #fff; font-weight: 600; text-decoration: none;
}
.btn.ikincil { background: var(--vurgu-acik); color: var(--vurgu); }
.btn.cizgili { background: transparent; border: 1.5px solid var(--cizgi); color: var(--metin); }
.btn.altin { background: var(--altin); color: #1b1300; }
.btn.tam { width: 100%; }
.btn:disabled { opacity: .5; cursor: default; }
.satir { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* Ana sayfa */
.karsilama {
  background: linear-gradient(135deg, #14324f 0%, #1d5fa8 100%); color: #fff;
  border-radius: 18px; padding: 20px; margin-bottom: 16px; position: relative; overflow: hidden;
}
.karsilama h1 { margin: 0 0 4px; font-size: 21px; }
.karsilama p { margin: 0; opacity: .9; font-size: 14.5px; }
.sayac { display: flex; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.sayac div { background: rgba(255,255,255,.14); border-radius: 12px; padding: 8px 12px; min-width: 76px; text-align: center; }
.sayac b { display: block; font-size: 24px; line-height: 1.1; }
.sayac small { font-size: 12px; opacity: .85; }
.tarih-duzenle { background: none; border: 0; color: #fff; text-decoration: underline; font-size: 13px; opacity: .85; padding: 8px 0 0; }

.ders-kart { cursor: pointer; border-left: 5px solid var(--renk, var(--vurgu)); }
.ders-kart h3 { margin: 0 0 2px; font-size: 16.5px; }
.ders-kart .ust-bilgi { display: flex; justify-content: space-between; gap: 8px; font-size: 13px; color: var(--soluk); }
.cubuk { height: 7px; background: var(--cizgi); border-radius: 9px; overflow: hidden; margin-top: 10px; }
.cubuk i { display: block; height: 100%; background: var(--renk, var(--vurgu)); border-radius: 9px; }

/* Konu listesi */
.konu { display: flex; align-items: center; gap: 12px; cursor: pointer; }
.konu .no { width: 34px; height: 34px; flex: none; border-radius: 50%; background: var(--vurgu-acik); color: var(--vurgu); display: grid; place-items: center; font-weight: 700; }
.konu .ad { flex: 1; min-width: 0; }
.konu .ad b { display: block; font-size: 15.5px; }
.konu .ad small { color: var(--soluk); }
.kilit { font-size: 18px; }
.etiket { display: inline-block; font-size: 11.5px; font-weight: 700; padding: 2px 8px; border-radius: 99px; background: var(--dogru-acik); color: var(--dogru); }
.etiket.pro { background: #f7edd4; color: #8a6510; }

/* Soru */
.soru-ust { display: flex; justify-content: space-between; align-items: center; gap: 8px; font-size: 14px; color: var(--soluk); margin-bottom: 8px; }
.soru-kok { font-size: 17px; line-height: 1.55; margin: 0 0 14px; white-space: pre-line; }
.soru-kok u { text-decoration-thickness: 2px; font-weight: 700; }
.siklar { display: grid; gap: 9px; }
.sik {
  display: flex; gap: 12px; align-items: flex-start; text-align: left; width: 100%;
  background: var(--kart); border: 1.5px solid var(--cizgi); border-radius: 12px; padding: 12px 14px; min-height: 50px;
}
.sik .harf { flex: none; width: 28px; height: 28px; border-radius: 50%; border: 1.5px solid var(--cizgi); display: grid; place-items: center; font-weight: 700; font-size: 14px; }
.sik.secili { border-color: var(--vurgu); background: var(--vurgu-acik); }
.sik.secili .harf { background: var(--vurgu); border-color: var(--vurgu); color: #fff; }
.sik.dogru { border-color: var(--dogru); background: var(--dogru-acik); }
.sik.dogru .harf { background: var(--dogru); border-color: var(--dogru); color: #fff; }
.sik.yanlis { border-color: var(--yanlis); background: var(--yanlis-acik); }
.sik.yanlis .harf { background: var(--yanlis); border-color: var(--yanlis); color: #fff; }
.aciklama { margin-top: 14px; border-radius: 12px; padding: 14px; background: var(--vurgu-acik); font-size: 15px; }
.aciklama .kaynak { margin-top: 8px; font-size: 13.5px; color: var(--soluk); }
.aciklama blockquote { margin: 8px 0 0; padding: 8px 12px; border-left: 3px solid var(--vurgu); background: var(--kart); border-radius: 6px; font-size: 14px; font-style: italic; }
.alt-dugmeler { display: flex; gap: 10px; margin-top: 16px; }
.alt-dugmeler .btn { flex: 1; }

/* Sınav modu */
.sinav-cubuk { position: sticky; top: 56px; z-index: 15; background: var(--zemin); padding: 8px 0; display: flex; align-items: center; gap: 10px; }
.sure { font-variant-numeric: tabular-nums; font-weight: 700; font-size: 17px; background: var(--kart); border: 1px solid var(--cizgi); border-radius: 10px; padding: 6px 12px; }
.sure.az { color: var(--yanlis); border-color: var(--yanlis); }
.isaretle { background: none; border: 1.5px solid var(--cizgi); border-radius: 10px; padding: 6px 10px; font-size: 14px; }
.isaretle.aktif { border-color: var(--altin); background: #f7edd4; color: #6b4e0c; }
.optik { display: grid; grid-template-columns: repeat(auto-fill, minmax(40px, 1fr)); gap: 6px; }
.optik button { border: 1.5px solid var(--cizgi); background: var(--kart); border-radius: 8px; min-height: 40px; font-size: 13px; padding: 0; }
.optik button.cevapli { background: var(--vurgu); border-color: var(--vurgu); color: #fff; }
.optik button.isaretli { box-shadow: inset 0 -4px 0 var(--altin); }
.optik button.su-an { outline: 2.5px solid var(--altin); outline-offset: 1px; }
.optik button.d { background: var(--dogru); border-color: var(--dogru); color: #fff; }
.optik button.y { background: var(--yanlis); border-color: var(--yanlis); color: #fff; }
.ders-baslik { font-size: 12.5px; font-weight: 700; color: var(--soluk); margin: 10px 0 4px; text-transform: uppercase; letter-spacing: .4px; }

/* Sonuç */
.sonuc-ozet { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; text-align: center; }
.sonuc-ozet div { background: var(--zemin); border-radius: 12px; padding: 10px 4px; }
.sonuc-ozet b { display: block; font-size: 24px; }
.puan-buyuk { font-size: 44px; font-weight: 800; color: var(--vurgu); line-height: 1; }
table.tablo { width: 100%; border-collapse: collapse; font-size: 14.5px; }
table.tablo th, table.tablo td { padding: 8px 6px; border-bottom: 1px solid var(--cizgi); text-align: left; }
table.tablo td.s, table.tablo th.s { text-align: right; font-variant-numeric: tabular-nums; }

/* Perde (modal) */
.perde { position: fixed; inset: 0; z-index: 50; background: rgba(10, 20, 30, .55); display: grid; place-items: center; padding: 16px; }
.perde[hidden] { display: none; }
.perde .kutu { background: var(--kart); border-radius: 18px; padding: 22px; width: 100%; max-width: 440px; max-height: 90vh; overflow: auto; }
.perde h2 { margin-top: 0; }
.perde ul { padding-left: 20px; margin: 8px 0 16px; }
.perde li { margin: 4px 0; }
.fiyat { font-size: 30px; font-weight: 800; color: var(--ana); }
@media (prefers-color-scheme: dark) { :root:not([data-tema="acik"]) .fiyat { color: var(--metin); } }

.bilgi-kutu { border-radius: 12px; padding: 12px 14px; background: #fff7e3; border: 1px solid #f0dca8; color: #5c4710; font-size: 14.5px; margin-bottom: 12px; }
@media (prefers-color-scheme: dark) { :root:not([data-tema="acik"]) .bilgi-kutu { background: #2c2512; border-color: #4d4020; color: #f0dca8; } }
.bos { text-align: center; padding: 30px 10px; color: var(--soluk); }
.bos span { font-size: 40px; display: block; margin-bottom: 6px; }
.sekmeler { display: flex; gap: 6px; overflow-x: auto; margin-bottom: 12px; }
.sekmeler button { border: 1.5px solid var(--cizgi); background: var(--kart); border-radius: 99px; padding: 7px 14px; white-space: nowrap; font-size: 14px; min-height: 38px; }
.sekmeler button.secili { background: var(--vurgu); border-color: var(--vurgu); color: #fff; }
input[type="date"], select { font: inherit; padding: 10px; border-radius: 10px; border: 1.5px solid var(--cizgi); background: var(--kart); color: var(--metin); width: 100%; }

@media (max-width: 420px) {
  main { padding: 12px; }
  .soru-kok { font-size: 16px; }
  .sayac div { min-width: 64px; padding: 7px 8px; }
  .sayac b { font-size: 20px; }
}