/* AstroFırat — renkler yıldız tayf renklerinden:
   mavi = dersler, beyaz = haberler, amber = sorular */
:root {
  color-scheme: dark;
  --gece: #0F1C30;
  --gece-2: #16263F;
  --cizgi: #2A3C5A;
  --yildiz: #E8ECF4;
  --soluk: #9AA8BF;
  --beyaz: #F4F6FB;
  --mavi: #8FB8FF;
  --amber: #F2B26B;
  --hata: #FF9E8F;

  --serif: "Newsreader", Georgia, serif;
  --sans: "Figtree", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;

  --olcu: 46rem;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--gece);
  color: var(--yildiz);
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.65;
}

a {
  color: var(--mavi);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
  border-radius: 2px;
}

.kap {
  width: min(100% - 2.5rem, var(--olcu));
  margin-inline: auto;
}

/* Üst menü */
.ust { border-bottom: 1px solid var(--cizgi); }
.ust .kap {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 1rem;
}
.logo {
  color: var(--yildiz);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.menu {
  display: flex;
  gap: 1.35rem;
  font-family: var(--sans);
  font-size: 0.95rem;
}
.menu a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding-block: 0.25rem;
  color: var(--soluk);
  text-decoration: none;
}
.menu a:hover { color: var(--yildiz); }
.menu a[aria-current="page"] {
  color: var(--yildiz);
  text-decoration: underline;
  text-decoration-color: var(--cizgi);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.45em;
}

/* Bölüm renk noktası */
.nokta {
  display: inline-block;
  flex: none;
  width: 0.45em;
  height: 0.45em;
  border-radius: 50%;
  background: var(--c);
  box-shadow: 0 0 0.6em var(--c);
}
.nokta.n-ders { --c: var(--mavi); }
.nokta.n-haber { --c: var(--beyaz); }
.nokta.n-soru { --c: var(--amber); }

/* Ana sayfa: yıldız izi */
.hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: min(76vh, 44rem);
  overflow: hidden;
  background: linear-gradient(to bottom, #0A1526, #13233C);
}
.hero canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, var(--gece) 0%, rgba(15, 28, 48, 0.8) 32%, rgba(15, 28, 48, 0) 68%);
  pointer-events: none;
}
.hero-metin {
  position: relative;
  z-index: 1;
  padding-bottom: 2.5rem;
}
.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(3.4rem, 13vw, 7.25rem);
  font-weight: 500;
  line-height: 0.95;
  letter-spacing: -0.035em;
}
.hero p {
  max-width: 31rem;
  margin: 0;
  font-size: 1.25rem;
  line-height: 1.5;
}

/* Bölümler */
.bolum { padding-top: 3.5rem; }
.bolum-bas {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-bottom: 1rem;
}
.bolum-bas a { font-family: var(--sans); font-size: 0.95rem; }

h2 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.bolum-bas h2,
.sayfa-bas h1 {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}
.giris { max-width: 36rem; margin: 0 0 1.5rem; }

.sayfa-bas { padding-block: 3rem 1.5rem; }
.sayfa-bas h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2.5rem, 8vw, 3.75rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.025em;
}
.sayfa-bas p { max-width: 36rem; margin: 0; color: var(--soluk); }

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.9rem;
  margin: 0;
  color: var(--soluk);
  font-family: var(--sans);
  font-size: 0.875rem;
}

/* Haberler */
.haberler { margin: 0; padding: 0; list-style: none; }
.haber { padding-block: 1.25rem; border-top: 1px solid var(--cizgi); }
.haber h2,
.haber h3 {
  margin: 0.3rem 0 0.4rem;
  font-size: 1.3rem;
  font-weight: 500;
  line-height: 1.3;
}
.haber p { margin: 0 0 0.5rem; }
.haber .meta { margin: 0; }
.kaynak { font-family: var(--sans); font-size: 0.9rem; color: var(--soluk); }

/* Ders listesi: gerçekten bir sıra olduğu için numaralı */
.dersler { margin: 0; padding: 0; list-style: none; counter-reset: ders; }
.dersler li {
  counter-increment: ders;
  display: grid;
  grid-template-columns: 2.25rem 1fr;
  gap: 0.1rem 1rem;
  padding-block: 1.1rem;
  border-top: 1px solid var(--cizgi);
}
.dersler li::before {
  content: counter(ders);
  grid-row: span 2;
  color: var(--mavi);
  font-size: 1.6rem;
  line-height: 1.2;
}
.dersler a { color: var(--yildiz); font-size: 1.25rem; text-decoration: none; }
.dersler a:hover { text-decoration: underline; }
.dersler p { grid-column: 2; margin: 0; color: var(--soluk); font-size: 1rem; }

/* Ders yazısı */
.ders-yazi { padding-block: 2.5rem 0; }
.geri { font-family: var(--sans); font-size: 0.95rem; }
.ders-yazi h1 {
  margin: 1.5rem 0 0.5rem;
  font-size: clamp(2.2rem, 6.5vw, 3.25rem);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.ders-yazi h2 { margin: 2.25rem 0 0.5rem; font-size: 1.4rem; }
.ders-yazi p { max-width: 38rem; }

code { font-family: var(--mono); font-size: 0.86em; }
p code {
  padding: 0.1em 0.35em;
  border-radius: 4px;
  background: var(--gece-2);
  white-space: nowrap;
}
.kod { margin: 1.25rem 0; }
.kod figcaption {
  padding: 0.4rem 1rem;
  border: 1px solid var(--cizgi);
  border-bottom: 0;
  border-radius: 6px 6px 0 0;
  background: #1B2D49;
  color: var(--soluk);
  font-family: var(--mono);
  font-size: 0.78rem;
}
.kod pre {
  margin: 0;
  padding: 1rem;
  overflow-x: auto;
  border: 1px solid var(--cizgi);
  border-radius: 6px;
  background: var(--gece-2);
  font-size: 0.9rem;
  line-height: 1.6;
}
.kod figcaption + pre { border-radius: 0 0 6px 6px; }
.not {
  margin: 1.5rem 0;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid var(--mavi);
}
.ders-gezinti {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--cizgi);
  font-family: var(--sans);
  font-size: 0.95rem;
}

/* Formlar */
.form {
  display: grid;
  gap: 1rem;
  padding: 1.25rem;
  border: 1px solid var(--cizgi);
  border-radius: 10px;
  background: var(--gece-2);
}
.form h3 { margin: 0; font-size: 1.15rem; font-weight: 500; }
label {
  display: grid;
  gap: 0.35rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
}
.ipucu { color: var(--soluk); font-size: 0.85rem; font-weight: 400; }
input, textarea, select {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--cizgi);
  border-radius: 6px;
  background: var(--gece);
  color: var(--yildiz);
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 400;
}
input::placeholder, textarea::placeholder { color: #6F7E97; }
textarea { min-height: 6.5rem; resize: vertical; line-height: 1.5; }
.satir { display: grid; grid-template-columns: 1fr 1fr; align-items: end; gap: 1rem; }

.dugme {
  display: inline-block;
  justify-self: start;
  padding: 0.7rem 1.2rem;
  border: 0;
  border-radius: 6px;
  background: var(--amber);
  color: var(--gece);
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}
.dugme:hover { background: #F6C488; }
.hata { margin: 0; color: var(--hata); font-family: var(--sans); font-size: 0.95rem; }
.hata:empty { display: none; }

/* Sorular */
.deneme {
  margin: 0 0 2rem;
  padding: 0.8rem 1rem;
  border: 1px dashed var(--cizgi);
  border-radius: 8px;
  color: var(--soluk);
  font-family: var(--sans);
  font-size: 0.9rem;
  line-height: 1.5;
}
#soru-sor h2, #sorulanlar h2 { margin-bottom: 1rem; }
#sorulanlar { padding-top: 3rem; }

.konu-filtre { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; }
.konu-filtre button {
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--cizgi);
  border-radius: 999px;
  background: transparent;
  color: var(--soluk);
  font-family: var(--sans);
  font-size: 0.9rem;
  cursor: pointer;
}
.konu-filtre button:hover { color: var(--yildiz); }
.konu-filtre button[aria-pressed="true"] {
  border-color: var(--yildiz);
  background: var(--yildiz);
  color: var(--gece);
}

.soru { border-top: 1px solid var(--cizgi); }
.soru summary {
  display: grid;
  gap: 0.35rem;
  padding-block: 1.1rem;
  list-style: none;
  cursor: pointer;
}
.soru summary::-webkit-details-marker { display: none; }
.soru-baslik { font-size: 1.25rem; line-height: 1.35; }
.soru summary:hover .soru-baslik,
.soru[open] .soru-baslik { color: var(--amber); }
.sayac.var { color: var(--yildiz); }
.soru-ic { padding-bottom: 1.75rem; }
.soru-aciklama, .cevap > p:first-child { white-space: pre-line; }
.soru-aciklama { margin: 0 0 1.25rem; }
.cevap {
  margin: 0 0 1.25rem;
  padding: 0.15rem 0 0.15rem 1rem;
  border-left: 2px solid var(--amber);
}
.cevap p { margin: 0 0 0.4rem; }
.cevap-kaynak { font-family: var(--sans); font-size: 0.9rem; }
.cevap-kaynak strong { color: var(--amber); font-weight: 600; }
.alan { color: var(--soluk); }
.bos { color: var(--soluk); }

.durum {
  position: fixed;
  left: 50%;
  bottom: 1.25rem;
  z-index: 10;
  margin: 0;
  padding: 0.6rem 1rem;
  border-radius: 6px;
  background: var(--yildiz);
  color: var(--gece);
  font-family: var(--sans);
  font-weight: 500;
  opacity: 0;
  transform: translateX(-50%);
  transition: opacity 0.2s;
  pointer-events: none;
}
.durum.gorunur { opacity: 1; }

.alt {
  margin-top: 5rem;
  padding-block: 2rem;
  border-top: 1px solid var(--cizgi);
  color: var(--soluk);
  font-family: var(--sans);
  font-size: 0.9rem;
}
.alt p { margin: 0; }

@media (max-width: 540px) {
  .satir { grid-template-columns: 1fr; }
  .hero { min-height: 70vh; }
  .hero p { font-size: 1.15rem; }
}

@media (prefers-reduced-motion: reduce) {
  .durum { transition: none; }
}

/* Kaynak türüne göre açılan alanlar */
.kaynak-alan { display: grid; gap: 1rem; }
.kaynak-alan[hidden] { display: none; }
.cevap-kaynak em { font-style: italic; }
.cevap-kaynak .tur {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--amber);
}