/* learn.css — WGSL etüt sayfaları (llm.istanbul) · paylaşımlı, bpe/learn/ */

/* ─── Fonts — kök-mutlak (/fonts = bpe/fonts; servis kökü bpe/) ─── */
@font-face { font-family:'DM Sans'; font-weight:400; font-display:swap; src:url('/fonts/dm-sans-v17-latin-regular.woff2') format('woff2'); }
@font-face { font-family:'DM Sans'; font-weight:500; font-display:swap; src:url('/fonts/dm-sans-v17-latin-500.woff2') format('woff2'); }
@font-face { font-family:'DM Sans'; font-weight:600; font-display:swap; src:url('/fonts/dm-sans-v17-latin-600.woff2') format('woff2'); }
@font-face { font-family:'DM Sans'; font-weight:700; font-display:swap; src:url('/fonts/dm-sans-v17-latin-700.woff2') format('woff2'); }
@font-face { font-family:'JetBrains Mono'; font-weight:400; font-display:swap; src:url('/fonts/jetbrains-mono-v24-latin-regular.woff2') format('woff2'); }
@font-face { font-family:'JetBrains Mono'; font-weight:500; font-display:swap; src:url('/fonts/jetbrains-mono-v24-latin-500.woff2') format('woff2'); }
@font-face { font-family:'JetBrains Mono'; font-weight:600; font-display:swap; src:url('/fonts/jetbrains-mono-v24-latin-600.woff2') format('woff2'); }

:root {
  --surface-0:#0F1112; --surface-1:#111314; --surface-2:#161819; --surface-3:#1A1C1E; --surface-4:#1E2022;
  --amber:#F6A623; --amber-hover:#FBBF24; --amber-dim:rgba(246,166,35,0.12);
  --cyan:#22D3EE;
  --border:rgba(255,255,255,0.06); --border-hover:rgba(255,255,255,0.12);
  --text-1:#f3f4f6; --text-2:#9ca3af; --text-3:#868b94;   /* text-3 AA için yükseltildi (5.2:1+) */
  --mono:'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans:'DM Sans', system-ui, sans-serif;
  --bar-h:3.5rem;
  --code-bg:#0c0e0f; --code-fg:#cdd3de;
  --t-comment:#7e8794; --t-kw:#F6A623; --t-type:#22D3EE; --t-fn:#9FE0A8;
  --t-number:#F0A878; --t-string:#E5C07B; --t-attr:#82AAFF;
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  font-family:var(--sans); background:var(--surface-0); color:var(--text-1);
  line-height:1.6; -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale;
}
::selection { background:rgba(246,166,35,0.22); color:var(--amber); }
::-webkit-scrollbar { width:8px; height:8px; }
::-webkit-scrollbar-track { background:transparent; }
::-webkit-scrollbar-thumb { background:rgba(255,255,255,0.08); border-radius:4px; }
::-webkit-scrollbar-thumb:hover { background:rgba(255,255,255,0.16); }
a { color:var(--amber); text-decoration:none; }
a:hover { color:var(--amber-hover); }

/* ─── klavye focus (her interaktif öğe) ─── */
:focus-visible { outline:2px solid var(--amber); outline-offset:2px; border-radius:6px; }
a:focus-visible, button:focus-visible, input:focus-visible,
.nav-item:focus-visible, .rail-toc a:focus-visible, .sr-item:focus-visible,
.chapter-nav a:focus-visible, .table-wrap:focus-visible { outline:2px solid var(--amber); outline-offset:2px; }

/* ─── skip link ─── */
.skip-link { position:fixed; top:-3rem; left:.75rem; z-index:100; padding:.5rem .9rem;
  background:var(--amber); color:#0F1112; font-weight:600; font-size:.85rem; border-radius:8px; transition:top .15s; }
.skip-link:focus { top:.6rem; color:#0F1112; }

/* ─── reading progress ─── */
.progress-bar { position:fixed; top:0; left:0; height:2px; width:0; z-index:80;
  background:linear-gradient(90deg, var(--amber), var(--cyan)); transition:width .1s linear; }

/* ─── topbar ─── */
.topbar { position:sticky; top:0; z-index:60; height:var(--bar-h);
  display:flex; align-items:center; gap:1rem; padding:0 1.25rem;
  border-bottom:1px solid var(--border); background:rgba(15,17,18,0.82); backdrop-filter:blur(12px); }
.menu-btn { display:none; background:none; border:none; color:var(--text-2); cursor:pointer; padding:.35rem; border-radius:8px; }
.menu-btn:hover { color:var(--text-1); background:var(--surface-2); }
.brand { display:flex; align-items:center; gap:.4rem; font-weight:700; font-size:1rem; color:var(--text-1); white-space:nowrap; }
.brand:hover { color:var(--text-1); }
.brand-sep { color:var(--text-3); }
.brand-tag { color:var(--amber); font-weight:600; }
.back-link { font-size:.82rem; color:var(--text-2); font-weight:500; white-space:nowrap; }
.back-link:hover { color:var(--amber); }

/* ─── dil geçişi ─── */
.lang-switch { display:flex; gap:.15rem; margin-left:auto; border:1px solid var(--border); border-radius:8px; padding:.12rem; }
.lang-switch a { font-size:.74rem; font-weight:600; color:var(--text-2); padding:.18rem .5rem; border-radius:6px; letter-spacing:.03em; }
.lang-switch a:hover { color:var(--text-1); background:var(--surface-2); }
.lang-switch a.on { color:var(--amber); background:var(--amber-dim); }

/* ─── search ─── */
.search { position:relative; flex:1; max-width:360px; }
.search input { width:100%; height:2.1rem; padding:0 .85rem; border-radius:9px;
  background:var(--surface-2); border:1px solid var(--border); color:var(--text-1);
  font-family:var(--sans); font-size:.85rem; outline:none; transition:border-color .15s, background .15s; }
.search input::placeholder { color:var(--text-3); }
.search input:focus { border-color:rgba(246,166,35,0.55); background:var(--surface-3); }
.search-results { position:absolute; top:calc(100% + .4rem); left:0; right:0; z-index:70;
  background:var(--surface-2); border:1px solid var(--border-hover); border-radius:11px;
  box-shadow:0 14px 40px rgba(0,0,0,0.55); overflow:hidden; max-height:62vh; overflow-y:auto; display:none; }
.search-results.open { display:block; }
.sr-item { display:block; padding:.55rem .85rem .55rem .7rem; border-bottom:1px solid var(--border);
  cursor:pointer; border-left:2px solid transparent; }
.sr-item:last-child { border-bottom:none; }
.sr-item:hover { background:var(--surface-3); }
.sr-item.active { background:var(--amber-dim); border-left-color:var(--amber); }
.sr-item.active .sr-text { color:var(--amber); }
.sr-text { color:var(--text-1); font-size:.85rem; font-weight:500; }
.sr-text mark { background:transparent; color:var(--amber); font-weight:700; }
.sr-chapter { color:var(--text-2); font-size:.72rem; margin-top:.1rem; }
.sr-empty { padding:.7rem .85rem; color:var(--text-2); font-size:.82rem; }

/* ─── layout ─── */
.layout { display:grid; grid-template-columns:272px minmax(0,1fr) 236px; align-items:start; }

/* ─── sidebar ─── */
.sidebar { position:sticky; top:var(--bar-h); height:calc(100vh - var(--bar-h));
  overflow-y:auto; border-right:1px solid var(--border); padding:1.25rem .9rem 3rem; background:var(--surface-0); }
.nav { display:flex; flex-direction:column; gap:.1rem; }
.nav-group { margin-top:1.1rem; }
.nav-group-label { font-size:.68rem; letter-spacing:.08em; text-transform:uppercase; color:var(--text-3); font-weight:600; padding:.35rem .65rem; }
.nav-item { display:flex; align-items:baseline; gap:.6rem; padding:.4rem .65rem; border-radius:8px;
  color:var(--text-2); font-size:.86rem; line-height:1.35; transition:background .12s, color .12s; }
.nav-item:hover { background:var(--surface-2); color:var(--text-1); }
.nav-item.active { background:var(--amber-dim); color:var(--amber); }
.nav-item.active .nav-num { color:var(--amber); }
.nav-num { font-family:var(--mono); font-size:.72rem; color:var(--text-3); min-width:1.9rem; font-weight:500; }
.nav-title { font-weight:500; }

/* ─── content ─── */
.content { min-width:0; padding:2.5rem 3rem 4rem; }
.content:focus { outline:none; }
.chapter { max-width:768px; margin:0 auto; }

/* ─── tipografi ─── */
.hd { position:relative; scroll-margin-top:calc(var(--bar-h) + 1rem); }
.hd-anchor { position:absolute; left:-1.3rem; color:var(--text-3); opacity:0; font-weight:400; text-decoration:none; transition:opacity .12s; }
.hd:hover .hd-anchor { opacity:1; }
.hd-anchor:hover { color:var(--amber); }
h1.hd { font-size:1.95rem; font-weight:700; line-height:1.2; letter-spacing:-0.01em; margin:.2rem 0 1.1rem; }
h2.hd { font-size:1.35rem; font-weight:600; margin:2.4rem 0 1rem; padding-top:.4rem; }
h3.hd { font-size:1.08rem; font-weight:600; margin:1.8rem 0 .7rem; color:var(--text-1); }
h4.hd { font-size:.95rem; font-weight:600; margin:1.3rem 0 .5rem; color:var(--text-2); }
.content p { margin:.85rem 0; color:#dfe3e8; }
.content ul, .content ol { margin:.85rem 0 .85rem 1.35rem; }
.content li { margin:.35rem 0; color:#dfe3e8; }
.content li > ul, .content li > ol { margin:.35rem 0 .35rem 1.1rem; }
.content strong { color:var(--text-1); font-weight:600; }
.content em { color:#e9d7b8; }
hr { border:none; border-top:1px solid var(--border); margin:2.2rem 0; }

code.inline { font-family:var(--mono); font-size:.84em; background:var(--surface-3);
  border:1px solid var(--border); border-radius:5px; padding:.1em .38em; color:#e7c9a0; }

.content a { border-bottom:1px solid rgba(246,166,35,0.25); }
.content a:hover { border-bottom-color:var(--amber-hover); }
a.src-link { color:var(--cyan); border-bottom-color:rgba(34,211,238,0.3); }
a.src-link:hover { color:#67e8f9; }
a.src-link::after { content:' ↗'; font-size:.8em; opacity:.7; }
.ext-doc { color:var(--text-2); border-bottom:1px dotted var(--text-3); cursor:help; }

/* ─── blockquote ─── */
blockquote { margin:1.1rem 0; padding:.8rem 1.1rem; background:var(--surface-1);
  border-left:3px solid var(--amber); border-radius:0 8px 8px 0; color:var(--text-2); }
blockquote p { margin:.3rem 0; color:var(--text-2); }
blockquote strong { color:var(--text-1); }

/* ─── callout (GFM alerts) ─── */
.callout { margin:1.2rem 0; padding:.85rem 1.1rem; border-radius:0 9px 9px 0; background:var(--surface-1); border-left:3px solid var(--text-3); }
.callout-head { font-size:.72rem; letter-spacing:.06em; text-transform:uppercase; font-weight:700; margin-bottom:.35rem; }
.callout p { margin:.3rem 0; color:#dfe3e8; }
.callout p:first-of-type { margin-top:0; }
.callout-note { border-left-color:var(--cyan); } .callout-note .callout-head { color:var(--cyan); }
.callout-tip { border-left-color:var(--t-fn); } .callout-tip .callout-head { color:var(--t-fn); }
.callout-important { border-left-color:var(--amber); } .callout-important .callout-head { color:var(--amber); }
.callout-warning { border-left-color:var(--t-number); } .callout-warning .callout-head { color:var(--t-number); }
.callout-caution { border-left-color:#f87171; } .callout-caution .callout-head { color:#f87171; }

/* ─── code blocks ─── */
.code-block { margin:1.2rem 0; border:1px solid var(--border); border-radius:11px; overflow:hidden; background:var(--code-bg); }
.code-bar { display:flex; align-items:center; justify-content:flex-end; gap:.6rem; height:2.1rem;
  padding:0 .7rem; background:var(--surface-2); border-bottom:1px solid var(--border); }
.code-lang { margin-right:auto; font-family:var(--mono); font-size:.68rem; letter-spacing:.06em; text-transform:uppercase; color:var(--text-3); }
.copy-btn { font-family:var(--mono); font-size:.7rem; color:var(--text-2); background:none;
  border:1px solid var(--border); border-radius:6px; padding:.18rem .5rem; cursor:pointer; transition:.12s; }
.copy-btn:hover { color:var(--amber); border-color:rgba(246,166,35,0.4); background:var(--amber-dim); }
.copy-btn.done { color:var(--cyan); border-color:rgba(34,211,238,0.4); }
pre.code { margin:0; padding:1rem 1.1rem; overflow-x:auto; }
pre.code code { font-family:var(--mono); font-size:.82rem; line-height:1.65; color:var(--code-fg); background:none; border:none; padding:0; white-space:pre; }
.t-comment { color:var(--t-comment); font-style:italic; }
.t-kw { color:var(--t-kw); } .t-type { color:var(--t-type); } .t-fn { color:var(--t-fn); }
.t-number { color:var(--t-number); } .t-string { color:var(--t-string); } .t-attr { color:var(--t-attr); }

/* ─── tables ─── */
.table-wrap { margin:1.2rem 0; overflow-x:auto; border:1px solid var(--border); border-radius:11px; }
table { width:100%; border-collapse:collapse; font-size:.84rem; }
thead th { background:var(--surface-2); color:var(--text-1); font-weight:600; text-align:left;
  padding:.6rem .8rem; border-bottom:1px solid var(--border-hover); white-space:nowrap; }
tbody td { padding:.55rem .8rem; border-bottom:1px solid var(--border); color:#dfe3e8; vertical-align:top; }
tbody tr:last-child td { border-bottom:none; }
tbody tr:nth-child(even) { background:rgba(255,255,255,0.012); }
table code.inline { font-size:.8em; }

/* ─── chapter prev/next ─── */
.chapter-nav { display:flex; justify-content:space-between; gap:1rem; margin-top:3rem; padding-top:1.5rem; border-top:1px solid var(--border); }
.chapter-nav a { display:flex; flex-direction:column; gap:.2rem; padding:.7rem 1rem; border-radius:10px; border:1px solid var(--border); flex:1; max-width:48%; }
.chapter-nav a:hover { border-color:var(--border-hover); background:var(--surface-1); }
.cn-next { text-align:right; align-items:flex-end; }
.cn-dir { font-size:.72rem; color:var(--text-3); }
.cn-name { font-size:.88rem; color:var(--text-1); font-weight:500; }

/* ─── right rail ─── */
.rail { position:sticky; top:var(--bar-h); height:calc(100vh - var(--bar-h)); overflow-y:auto; padding:2.5rem 1.1rem 3rem .4rem; }
.rail-label { font-size:.68rem; letter-spacing:.08em; text-transform:uppercase; color:var(--text-3); font-weight:600; margin-bottom:.7rem; padding-left:.75rem; }
.rail-toc { display:flex; flex-direction:column; gap:.05rem; border-left:1px solid var(--border); }
.rail-toc a { display:block; padding:.28rem .75rem; margin-left:-1px; font-size:.78rem; line-height:1.35; color:var(--text-2); border-left:1px solid transparent; }
.rail-toc a.lvl3 { padding-left:1.5rem; font-size:.75rem; color:var(--text-3); }
.rail-toc a:hover { color:var(--text-1); }
.rail-toc a.active { color:var(--amber); border-left-color:var(--amber); }

/* ─── footer ─── */
.foot { max-width:768px; margin:4rem auto 0; padding-top:1.5rem; border-top:1px solid var(--border);
  display:flex; flex-direction:column; gap:.3rem; color:var(--text-3); font-size:.8rem; }

/* ─── scrim (mobil) ─── */
.scrim { display:none; position:fixed; inset:var(--bar-h) 0 0; background:rgba(0,0,0,0.5); z-index:40; }
.scrim.open { display:block; }

/* ─── responsive ─── */
@media (max-width:1180px) {
  .layout { grid-template-columns:272px minmax(0,1fr); }
  .rail { display:none; }
}
@media (max-width:860px) {
  .layout { grid-template-columns:1fr; }
  .menu-btn { display:inline-flex; }
  .sidebar { position:fixed; top:var(--bar-h); left:0; bottom:0; width:280px; z-index:50;
    transform:translateX(-100%); transition:transform .2s ease; box-shadow:0 0 40px rgba(0,0,0,0.5); }
  .sidebar.open { transform:translateX(0); }
  .content { padding:1.75rem 1.25rem 3rem; }
  .search { max-width:none; }
  .back-link { display:none; }
}
@media (max-width:520px) {
  .topbar { gap:.55rem; padding:0 .8rem; }
  h1.hd { font-size:1.6rem; }
  .hd-anchor { display:none; }
  thead th { white-space:normal; }
}

/* ─── hareket hassasiyeti ─── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior:auto; }
  *, *::before, *::after { animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
}