/* yontem.pro — çevrim içi kitaplar */
:root {
  --zemin: #FFFFFF; --zemin2: #F5F7FA; --murekkep: #0F1B2D; --metin: #1E293B; --soluk: #475569;
  --cizgi: #E3E8EF; --vurgu: #0B7A75; --vurgu-koyu: #07514D; --vurgu-acik: #E7F4F3;
  --kod-zemin: #0F1B2D; --kod-metin: #E2E8F0; --cikti-zemin: #F5F7FA; --cikti-metin: #1E293B;
  --ya: #5EEAD4; --ym: #FBBF77; --ys: #F9A8D4; --yy: #94A3B8;
}
@media (prefers-color-scheme: dark) {
  :root {
    --zemin: #0B1320; --zemin2: #111C2E; --murekkep: #F1F5F9; --metin: #D7DEE8; --soluk: #9AA8BA;
    --cizgi: #22324A; --vurgu: #5EEAD4; --vurgu-koyu: #99F6E4; --vurgu-acik: #12302F;
    --kod-zemin: #060C16; --cikti-zemin: #111C2E; --cikti-metin: #D7DEE8;
  }
}
* { box-sizing: border-box; }
html { scroll-padding-top: 88px; }
body { margin: 0; background: var(--zemin); color: var(--metin); font-family: 'Inter', system-ui, sans-serif;
  font-size: 17px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--vurgu-koyu); }
a:hover { color: var(--vurgu); }
h1, h2, h3, h4 { font-family: 'Space Grotesk', 'Inter', sans-serif; color: var(--murekkep); letter-spacing: -0.015em; }
.atla { position: absolute; left: -9999px; }
.atla:focus { left: 16px; top: 16px; z-index: 10; background: var(--zemin); padding: 8px 12px; }

/* üst menü */
.ust { position: sticky; top: 0; z-index: 5; background: var(--zemin); border-bottom: 1px solid var(--cizgi); }
.ust nav { max-width: 1320px; margin: 0 auto; padding: 12px 24px; display: flex; flex-wrap: wrap;
  align-items: center; justify-content: space-between; gap: 8px 24px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--murekkep);
  font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 21px; }
.menu { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 22px; font-size: 15px; font-weight: 500; }
.menu a { color: var(--soluk); text-decoration: none; padding: 10px 0; }
.menu a[aria-current="page"], .menu a[aria-current="true"] { color: var(--murekkep); font-weight: 600; }
.menu a.dugme { background: var(--murekkep); color: var(--zemin); padding: 10px 16px; border-radius: 10px; font-weight: 600; }

/* ortak */
.tur { font-size: 13px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--vurgu-koyu); }
.eylemler { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; }
.birincil { background: var(--vurgu); color: #fff; text-decoration: none; padding: 13px 20px; border-radius: 11px; font-weight: 600; }
.birincil:hover { color: #fff; filter: brightness(1.08); }
@media (prefers-color-scheme: dark) { .birincil, .birincil:hover { color: #06201F; } }
.pdf { display: inline-flex; align-items: center; gap: 8px; font-size: 15px; font-weight: 500; color: var(--soluk);
  text-decoration: none; padding: 10px 2px; }
.pdf small { font-size: 13px; color: var(--soluk); }
.pdf:hover { color: var(--murekkep); }
.kapak { width: 96px; height: 136px; border-radius: 6px; padding: 12px; display: flex; flex-direction: column;
  justify-content: space-between; box-shadow: 0 10px 22px -12px rgba(15, 27, 45, 0.55); flex: none; }
.kapak span { font-family: 'Space Grotesk', sans-serif; font-weight: 700; font-size: 12px; line-height: 1.2; color: #fff; hyphens: auto; overflow-wrap: anywhere; }
.kart-kapak { text-decoration: none; }
.kapak svg { display: block; width: 22px; height: 22px; color: #5EEAD4; }
.kapak.acik { border: 1px solid #CBD5E1; }
.kapak.acik span { color: #0F1B2D; }
.kapak.acik svg { color: #0B7A75; }
.kapak.buyuk { width: 180px; height: 256px; padding: 20px; border-radius: 8px; }
.kapak.buyuk span { font-size: 22px; }
.kapak.buyuk svg { width: 40px; height: 40px; }

/* kitaplık */
.kitaplik-ana { max-width: 1080px; margin: 0 auto; padding: 64px 24px 88px; }
.kitaplik-ana h1 { font-size: 48px; line-height: 1.08; margin: 0 0 16px; letter-spacing: -0.03em; }
.ozet { font-size: 19px; line-height: 1.6; color: var(--soluk); max-width: 640px; margin: 0; }
.kartlar { list-style: none; margin: 48px 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(420px, 1fr)); gap: 32px; }
@media (max-width: 520px) { .kartlar { grid-template-columns: 1fr; } }
.kart { display: flex; gap: 24px; align-items: flex-start; padding: 24px; border: 1px solid var(--cizgi); border-radius: 16px; }
.kart h2 { font-size: 22px; margin: 6px 0 8px; line-height: 1.25; }
.kart h2 a { color: var(--murekkep); text-decoration: none; }
.kart p { margin: 0 0 16px; color: var(--soluk); font-size: 16px; }

/* kitap ana sayfası */
.kitap-giris { max-width: 960px; margin: 0 auto; padding: 56px 24px 88px; }
.kitap-ust { display: flex; flex-wrap: wrap; gap: 40px; align-items: flex-end; padding-bottom: 48px; border-bottom: 1px solid var(--cizgi); }
.kitap-bilgi { flex: 1 1 360px; min-width: 0; }
.kitap-bilgi h1 { font-size: 44px; line-height: 1.08; margin: 8px 0 12px; letter-spacing: -0.03em; }
.yazar { color: var(--soluk); margin: 12px 0 24px; }
.icindekiler h2 { font-size: 26px; margin: 48px 0 16px; }
.icindekiler > ol { list-style: none; padding: 0; margin: 0; counter-reset: b; }
.icindekiler > ol > li { padding: 14px 0; border-bottom: 1px solid var(--cizgi); }
.icindekiler a.bolum { font-family: 'Space Grotesk', sans-serif; font-weight: 600; font-size: 19px; color: var(--murekkep); text-decoration: none; }
.icindekiler a.bolum code { font-size: 0.9em; }
.icindekiler ul { list-style: none; margin: 6px 0 0; padding: 0; display: flex; flex-wrap: wrap; gap: 2px 18px; }
.icindekiler ul a { font-size: 15px; color: var(--soluk); text-decoration: none; }
.icindekiler ul a:hover { color: var(--vurgu-koyu); text-decoration: underline; }

/* okuma düzeni */
.okuma { max-width: 1320px; margin: 0 auto; padding: 32px 24px 88px; display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 220px; gap: 48px; align-items: start; }
.yan, .bu-bolumde { position: sticky; top: 88px; max-height: calc(100vh - 112px); overflow-y: auto; font-size: 14.5px; }
.yan summary { list-style: none; font-family: 'Space Grotesk', sans-serif; font-weight: 600; font-size: 16px; margin-bottom: 12px; cursor: default; }
.yan summary::-webkit-details-marker { display: none; }
.yan summary a { color: var(--murekkep); text-decoration: none; }
.yan ol, .bu-bolumde ol { list-style: none; margin: 0; padding: 0; }
.yan li a { display: block; padding: 6px 10px; border-radius: 8px; color: var(--soluk); text-decoration: none; line-height: 1.4; }
.yan li a:hover { background: var(--zemin2); color: var(--murekkep); }
.yan li a[aria-current="page"] { background: var(--vurgu-acik); color: var(--vurgu-koyu); font-weight: 600; }
.yan code { font-size: 0.9em; }
.yan .pdf { margin-top: 12px; }
.bu-bolumde span { display: block; font-size: 12px; font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; color: var(--soluk); margin-bottom: 8px; }
.bu-bolumde a { display: block; padding: 4px 0; color: var(--soluk); text-decoration: none; line-height: 1.4; }
.bu-bolumde a:hover { color: var(--vurgu-koyu); }
@media (max-width: 1200px) { .okuma { grid-template-columns: 240px minmax(0, 1fr); } .bu-bolumde { display: none; } }
@media (max-width: 860px) {
  .okuma { grid-template-columns: 1fr; gap: 24px; padding-top: 16px; }
  .yan { position: static; max-height: none; border: 1px solid var(--cizgi); border-radius: 12px; padding: 12px 14px; }
  .yan details:not([open]) summary { margin: 0; }
  .yan summary { cursor: pointer; }
  .yan ol { max-height: 320px; overflow-y: auto; }
}

/* metin */
.metin { max-width: 760px; min-width: 0; font-size: 18px; line-height: 1.75; }
.metin .iz { font-size: 14px; color: var(--soluk); margin: 0 0 8px; }
.metin .iz a { color: var(--soluk); }
.metin h2 { font-size: 38px; line-height: 1.12; margin: 8px 0 28px; letter-spacing: -0.03em; }
.metin h3 { font-size: 25px; line-height: 1.25; margin: 48px 0 12px; }
.metin h4 { font-size: 20px; margin: 32px 0 8px; }
.metin p, .metin li { color: var(--metin); }
.metin p { margin: 0 0 18px; }
.metin ul, .metin ol { padding-left: 24px; margin: 0 0 18px; }
.metin li { margin: 4px 0; }
.metin strong { color: var(--murekkep); }
.metin code { font-family: 'JetBrains Mono', ui-monospace, monospace; font-size: 0.86em; background: var(--zemin2);
  padding: 1px 5px; border-radius: 5px; overflow-wrap: anywhere; }
.metin h2 code, .metin h3 code { background: none; padding: 0; font-size: 0.9em; }
.metin blockquote { margin: 0 0 18px; padding: 4px 20px; border-left: 3px solid var(--vurgu); color: var(--soluk); }
.metin figure { margin: 28px 0; }
.metin figure img, .metin p img { max-width: 100%; height: auto; border: 1px solid var(--cizgi); border-radius: 10px; background: #fff; }
.metin figcaption { font-size: 14.5px; color: var(--soluk); margin-top: 8px; text-align: center; }
.metin math[display="block"] { margin: 20px 0; overflow-x: auto; font-size: 1.05em; }
.tablo { overflow-x: auto; margin: 0 0 22px; border: 1px solid var(--cizgi); border-radius: 10px; }
.metin table { border-collapse: collapse; width: 100%; font-size: 15.5px; line-height: 1.5; }
.metin th, .metin td { padding: 10px 14px; text-align: left; vertical-align: top; border-top: 1px solid var(--cizgi); }
.metin thead th { background: var(--zemin2); border-top: none; font-weight: 600; color: var(--murekkep); }

/* kod */
.kod { position: relative; margin: 0 0 22px; border-radius: 12px; overflow: hidden; }
.kod pre { margin: 0; padding: 38px 20px 18px; overflow-x: auto; font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 14.5px; line-height: 1.65; tab-size: 4; }
.kod pre code { background: none; padding: 0; font-size: inherit; border-radius: 0; overflow-wrap: normal; }
.kod.program, .kod.kabuk { background: var(--kod-zemin); color: var(--kod-metin); }
.kod.cikti { background: var(--cikti-zemin); color: var(--cikti-metin); border: 1px solid var(--cizgi); }
.kod-etiket { position: absolute; top: 10px; left: 20px; font-family: 'Inter', sans-serif; font-size: 11.5px; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--yy); }
.kod.cikti .kod-etiket { color: var(--soluk); }
.kopyala { position: absolute; top: 6px; right: 8px; font: 500 12.5px 'Inter', sans-serif; color: var(--yy);
  background: transparent; border: 1px solid transparent; border-radius: 7px; padding: 6px 10px; cursor: pointer; min-height: 32px; }
.kopyala:hover, .kopyala:focus-visible { border-color: currentColor; }
.kod.cikti .kopyala { color: var(--soluk); }
.ya { color: var(--ya); font-weight: 600; }
.ym { color: var(--ym); }
.ys { color: var(--ys); }
.yy { color: var(--yy); font-style: italic; }

/* bölümler arası */
.sayfala { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 56px; padding-top: 32px; border-top: 1px solid var(--cizgi); }
.sayfala a { display: flex; flex-direction: column; gap: 4px; padding: 16px 18px; border: 1px solid var(--cizgi); border-radius: 12px;
  text-decoration: none; color: var(--murekkep); font-family: 'Space Grotesk', sans-serif; font-weight: 600; font-size: 16px; line-height: 1.35; }
.sayfala a:hover { border-color: var(--vurgu); }
.sayfala small { font-family: 'Inter', sans-serif; font-weight: 500; font-size: 13px; color: var(--soluk); }
.sayfala .sonraki { text-align: right; grid-column: 2; }
@media (max-width: 560px) { .sayfala { grid-template-columns: 1fr; } .sayfala .sonraki { grid-column: 1; } }

/* alt bilgi */
.alt { max-width: 1320px; margin: 0 auto; padding: 32px 24px 40px; border-top: 1px solid var(--cizgi); display: flex;
  flex-wrap: wrap; justify-content: space-between; gap: 12px; font-size: 14px; color: var(--soluk); }
.alt a { color: var(--soluk); }

@media print {
  .ust, .yan, .bu-bolumde, .sayfala, .alt, .kopyala { display: none !important; }
  .okuma { display: block; padding: 0; }
  .metin { max-width: none; }
}