/* TEL 519E ders notları — ortak stil */
*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg: #f6f4ef;
  --paper: #fffefb;
  --ink: #1b1c20;
  --ink-2: #464a52;
  --ink-3: #7c8089;
  --rule: #e6e2d8;
  --rule-strong: #d3cec2;
  --soft: #f0ede5;
  --code-bg: #f3f0e8;
  --w1: #3b50b0;
  --w2: #0e7c6f;
  --w3: #b5541c;
  --accent: var(--w1);
  --c-def: #3b50b0;
  --c-key: #b5541c;
  --c-exam: #8a3ab9;
  --c-warn: #c0392b;
  --c-ex: #0e7c6f;
  --c-book: #6b6f78;
  --plot-bg: #f3f0e9;
  --plot-grid: #e2ddd2;
  --plot-ink: #3b3e45;
  --plot-2: #c0392b;
  --shadow: 0 1px 0 rgba(0,0,0,.03), 0 8px 28px -14px rgba(0,0,0,.18);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111215; --paper: #17191d; --ink: #e7e5e0; --ink-2: #b6b8bd; --ink-3: #868990;
    --rule: #2a2d33; --rule-strong: #393c43; --soft: #1e2025; --code-bg: #1c1e23;
    --w1: #93a3ff; --w2: #4fd1bd; --w3: #f09a5e;
    --c-def: #93a3ff; --c-key: #f09a5e; --c-exam: #cc9df2; --c-warn: #ff8a7a; --c-ex: #4fd1bd; --c-book: #a3a7af;
    --plot-bg: #1c1e23; --plot-grid: #2c2f36; --plot-ink: #c9cbd0; --plot-2: #ff8a7a;
    --shadow: 0 1px 0 rgba(0,0,0,.4), 0 10px 30px -14px rgba(0,0,0,.6);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111215; --paper: #17191d; --ink: #e7e5e0; --ink-2: #b6b8bd; --ink-3: #868990;
  --rule: #2a2d33; --rule-strong: #393c43; --soft: #1e2025; --code-bg: #1c1e23;
  --w1: #93a3ff; --w2: #4fd1bd; --w3: #f09a5e;
  --c-def: #93a3ff; --c-key: #f09a5e; --c-exam: #cc9df2; --c-warn: #ff8a7a; --c-ex: #4fd1bd; --c-book: #a3a7af;
  --plot-bg: #1c1e23; --plot-grid: #2c2f36; --plot-ink: #c9cbd0; --plot-2: #ff8a7a;
  --shadow: 0 1px 0 rgba(0,0,0,.4), 0 10px 30px -14px rgba(0,0,0,.6);
  color-scheme: dark;
}

body.w1 { --accent: var(--w1); }
body.w2 { --accent: var(--w2); }
body.w3 { --accent: var(--w3); }

html { scroll-behavior: smooth; scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17.5px/1.7 var(--serif);
  font-optical-sizing: auto;
  text-rendering: optimizeLegibility;
}
::selection { background: color-mix(in srgb, var(--accent) 25%, transparent); }
a { color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
img, canvas, svg { max-width: 100%; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 40px 0; }

/* ---------- üst çubuk ---------- */
.progress { position: fixed; top: 0; left: 0; height: 3px; width: 0; background: var(--accent); z-index: 60; transition: width .1s linear; }
.topbar {
  position: sticky; top: 0; z-index: 50;
  height: 60px;
  display: flex; align-items: center; gap: 16px;
  padding: 0 24px;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--rule);
  font-family: var(--sans);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 15px; letter-spacing: -.01em; white-space: nowrap; }
.brand .mark { width: 26px; height: 26px; border-radius: 7px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; padding: 4px; background: var(--ink); }
.brand .mark i { display: block; border-radius: 1px; background: var(--bg); }
.brand .mark i:nth-child(2), .brand .mark i:nth-child(4), .brand .mark i:nth-child(9) { opacity: .45; }
.brand .mark i:nth-child(5) { background: var(--accent); }
.brand small { font-weight: 500; color: var(--ink-3); }
.weeknav { display: flex; gap: 4px; margin-left: auto; }
.weeknav a {
  font-size: 13.5px; font-weight: 600; text-decoration: none; color: var(--ink-2);
  padding: 7px 12px; border-radius: 99px; white-space: nowrap;
}
.weeknav a:hover { background: var(--soft); color: var(--ink); }
.weeknav a[aria-current="page"] { background: var(--ink); color: var(--bg); }
.iconbtn {
  border: 1px solid var(--rule-strong); background: var(--paper); color: var(--ink);
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center; cursor: pointer; flex: none;
}
.iconbtn:hover { border-color: var(--ink-3); }
.iconbtn svg { width: 18px; height: 18px; }
#menuBtn { display: none; }

/* ---------- yerleşim ---------- */
.layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 56px;
  max-width: 1220px;
  margin: 0 auto;
  padding: 0 28px;
}
.layout.single { grid-template-columns: minmax(0, 1fr); max-width: 980px; }
.toc {
  position: sticky; top: 60px; align-self: start;
  max-height: calc(100vh - 60px); overflow: auto;
  padding: 32px 4px 40px 0;
  font-family: var(--sans); font-size: 13.5px; line-height: 1.45;
  scrollbar-width: thin;
}
.toc .toc-title { font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 12px 10px; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 1px 0; }
.toc a { display: block; padding: 5px 10px; border-radius: 8px; color: var(--ink-2); text-decoration: none; border-left: 2px solid transparent; }
.toc a:hover { background: var(--soft); color: var(--ink); }
.toc a .n { color: var(--ink-3); font-variant-numeric: tabular-nums; margin-right: 6px; font-weight: 600; }
.toc ol ol a { padding-left: 26px; font-size: 12.5px; color: var(--ink-3); }
.toc a.active { color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, transparent); font-weight: 600; }
.toc a.active .n { color: var(--accent); }
.toc .toc-foot { margin: 22px 10px 0; padding-top: 14px; border-top: 1px solid var(--rule); font-size: 12px; color: var(--ink-3); }
.toc .toc-foot a { display: inline; padding: 0; border: 0; color: var(--accent); }

.content { min-width: 0; max-width: 800px; padding: 40px 0 140px; }
.layout.single .content { max-width: none; }

/* ---------- başlıklar ---------- */
.hero { padding: 26px 0 30px; border-bottom: 1px solid var(--rule); margin-bottom: 8px; }
.eyebrow { font: 700 12px/1 var(--sans); letter-spacing: .12em; text-transform: uppercase; color: var(--accent); display: inline-flex; align-items: center; gap: 8px; }
.eyebrow::before { content: ""; width: 18px; height: 2px; background: currentColor; border-radius: 2px; }
h1 { font: 800 clamp(32px, 5vw, 46px)/1.08 var(--sans); letter-spacing: -.025em; margin: 14px 0 14px; text-wrap: balance; }
.lead { font-size: 20px; line-height: 1.6; color: var(--ink-2); margin: 0 0 22px; text-wrap: pretty; }
.meta { display: flex; flex-wrap: wrap; gap: 8px; font: 500 12.5px/1 var(--sans); }
.meta span { padding: 7px 10px; border-radius: 8px; background: var(--paper); border: 1px solid var(--rule); color: var(--ink-2); }
.meta b { color: var(--ink); font-weight: 600; }

h2 {
  font: 750 28px/1.2 var(--sans); letter-spacing: -.018em;
  margin: 76px 0 18px; padding-top: 22px; border-top: 1px solid var(--rule);
  text-wrap: balance;
}
.hero + h2 { border-top: 0; margin-top: 30px; padding-top: 10px; }
h2 .n { color: var(--accent); margin-right: 10px; font-variant-numeric: tabular-nums; }
h3 { font: 650 20.5px/1.3 var(--sans); letter-spacing: -.01em; margin: 44px 0 10px; }
h4 { font: 650 16px/1.35 var(--sans); margin: 28px 0 6px; }
p { margin: 0 0 16px; text-wrap: pretty; }
ul, ol { padding-left: 24px; margin: 0 0 18px; }
li { margin: 5px 0; }
li::marker { color: var(--ink-3); }
strong { font-weight: 650; }
.en { font-family: var(--sans); font-size: .78em; color: var(--ink-3); font-style: normal; font-weight: 500; white-space: nowrap; }
dfn { font-style: normal; font-weight: 650; color: var(--ink); }
.muted { color: var(--ink-3); }
.small { font-size: 15px; }
kbd, code {
  font-family: var(--mono); font-size: .82em;
  background: var(--code-bg); border: 1px solid var(--rule); border-radius: 5px; padding: 1px 5px;
}

/* ---------- uyarı kutuları ---------- */
.callout {
  --c: var(--c-def);
  position: relative;
  border: 1px solid color-mix(in srgb, var(--c) 26%, var(--rule));
  border-left: 4px solid var(--c);
  background: color-mix(in srgb, var(--c) 6%, var(--paper));
  border-radius: 10px;
  padding: 14px 18px 4px;
  margin: 24px 0;
}
.callout > .label {
  display: flex; align-items: center; gap: 7px;
  font: 700 11.5px/1 var(--sans); letter-spacing: .09em; text-transform: uppercase;
  color: var(--c); margin-bottom: 9px;
}
.callout > .label::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.callout.def  { --c: var(--c-def); }
.callout.key  { --c: var(--c-key); }
.callout.exam { --c: var(--c-exam); }
.callout.warn { --c: var(--c-warn); }
.callout.ex   { --c: var(--c-ex); }
.callout.book { --c: var(--c-book); border-left-style: dashed; }
.callout ul, .callout ol { margin-bottom: 12px; }

/* ---------- tablolar ---------- */
.tbl-wrap { overflow-x: auto; margin: 18px 0 22px; border: 1px solid var(--rule); border-radius: 10px; background: var(--paper); }
table.tbl { border-collapse: collapse; width: 100%; font: 14px/1.45 var(--sans); }
.tbl th, .tbl td { padding: 8px 12px; text-align: left; border-bottom: 1px solid var(--rule); vertical-align: top; }
.tbl thead th { font-size: 12px; font-weight: 700; letter-spacing: .04em; color: var(--ink-2); background: var(--soft); white-space: nowrap; }
.tbl tbody tr:last-child td { border-bottom: 0; }
.tbl td.num, .tbl th.num { text-align: right; font-family: var(--mono); font-size: 13px; font-variant-numeric: tabular-nums; }
.tbl td.c, .tbl th.c { text-align: center; }
.tbl tr.hl td { background: color-mix(in srgb, var(--accent) 8%, transparent); }
.tbl.compact th, .tbl.compact td { padding: 5px 10px; }

/* küçük matrisler (piksel değerleri) */
.matrix { display: inline-grid; gap: 2px; font: 13px/1 var(--mono); padding: 6px; border-left: 2px solid var(--ink-2); border-right: 2px solid var(--ink-2); border-radius: 4px; }
.matrix span { min-width: 30px; padding: 6px 4px; text-align: center; border-radius: 3px; }
.mat-row { display: flex; flex-wrap: wrap; gap: 26px; align-items: center; margin: 18px 0; font-family: var(--sans); font-size: 13.5px; }
.mat-row figure { margin: 0; display: flex; flex-direction: column; align-items: center; gap: 8px; }
.mat-row figcaption { margin: 0; }

/* ---------- kod ---------- */
pre {
  position: relative;
  background: var(--code-bg); border: 1px solid var(--rule); border-radius: 10px;
  padding: 34px 16px 14px; margin: 18px 0 22px; overflow-x: auto;
  font: 13.5px/1.6 var(--mono); color: var(--ink);
}
pre code { background: none; border: 0; padding: 0; font-size: inherit; }
pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute; top: 10px; left: 16px;
  font: 700 10.5px/1 var(--sans); letter-spacing: .1em; color: var(--ink-3);
}
pre .c { color: var(--ink-3); font-style: italic; }
pre .k { color: var(--accent); font-weight: 600; }
pre .s { color: var(--c-ex); }

/* ---------- şekiller ---------- */
figure { margin: 28px 0; }
figcaption { font: 13px/1.55 var(--sans); color: var(--ink-3); margin-top: 10px; }
figcaption b { color: var(--ink-2); }
.fig-svg { display: block; width: 100%; height: auto; }
.svg-ink { fill: var(--ink); }
.svg-ink2 { fill: var(--ink-2); }
.svg-ink3 { fill: var(--ink-3); }
.svg-stroke { stroke: var(--ink-2); }
.svg-paper { fill: var(--paper); }
.svg-soft { fill: var(--soft); }
.svg-rule { stroke: var(--rule-strong); }
.svg-accent { fill: var(--accent); }
svg text { font-family: var(--sans); }
.card-fig { background: var(--paper); border: 1px solid var(--rule); border-radius: 12px; padding: 18px; }

/* ---------- etkileşimli laboratuvar ---------- */
.lab {
  background: var(--paper); border: 1px solid var(--rule); border-radius: 14px;
  box-shadow: var(--shadow); margin: 30px 0; overflow: hidden;
}
.lab-head { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-bottom: 1px solid var(--rule); font-family: var(--sans); background: color-mix(in srgb, var(--accent) 4%, var(--paper)); }
.lab-head .tag { font: 700 10.5px/1 var(--sans); letter-spacing: .09em; text-transform: uppercase; color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); padding: 5px 8px; border-radius: 99px; }
.lab-head h4 { margin: 0; font: 650 15px/1.3 var(--sans); }
.lab-body { padding: 16px; }
.lab-note { font: 13px/1.55 var(--sans); color: var(--ink-3); margin: 12px 0 0; }
.controls { display: flex; flex-wrap: wrap; gap: 12px 22px; font: 13.5px/1.3 var(--sans); margin-bottom: 16px; align-items: flex-end; }
.ctrl { display: flex; flex-direction: column; gap: 5px; min-width: 160px; flex: 1 1 160px; }
.ctrl.narrow { flex: 0 1 auto; min-width: 0; }
.ctrl > label, .ctrl > .lbl { color: var(--ink-2); display: block; font-weight: 500; }
.ctrl output { font-family: var(--mono); font-size: 12.5px; color: var(--ink); float: right; margin-left: 8px; }
input[type="range"] { width: 100%; accent-color: var(--accent); margin: 2px 0; }
input[type="checkbox"], input[type="radio"] { accent-color: var(--accent); }
select, .btn, input[type="number"] {
  font: 500 13.5px/1 var(--sans); color: var(--ink);
  background: var(--paper); border: 1px solid var(--rule-strong); border-radius: 8px;
  padding: 8px 10px;
}
select { cursor: pointer; }
.btn { cursor: pointer; padding: 8px 14px; font-weight: 600; }
.btn:hover { border-color: var(--ink-3); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
:root[data-theme="dark"] .btn.primary { color: #111; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn.primary { color: #111; } }
.seg { display: inline-flex; border: 1px solid var(--rule-strong); border-radius: 9px; overflow: hidden; flex-wrap: wrap; }
.seg button { font: 600 12.5px/1 var(--sans); border: 0; background: var(--paper); color: var(--ink-2); padding: 8px 11px; cursor: pointer; border-right: 1px solid var(--rule); }
.seg button:last-child { border-right: 0; }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.checks { display: flex; flex-wrap: wrap; gap: 6px 14px; font: 13.5px var(--sans); }
.checks label { display: inline-flex; gap: 6px; align-items: center; cursor: pointer; }

.panels { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; }
.panels.two { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.panel { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.panel canvas.img { width: 100%; height: auto; border-radius: 8px; background: #000; display: block; outline: 1px solid var(--rule); }
.panel .cap { font: 12.5px/1.4 var(--sans); color: var(--ink-3); }
.panel .cap b { color: var(--ink); font-weight: 600; }
canvas.pix { image-rendering: pixelated; image-rendering: crisp-edges; }
canvas.plot { display: block; width: 100%; aspect-ratio: 16 / 9; border-radius: 8px; background: var(--plot-bg); }
canvas.plot.sq { aspect-ratio: 1 / 1; }
canvas.plot.wide { aspect-ratio: 3 / 1; }
.readout { font: 12.5px/1.5 var(--mono); color: var(--ink-2); background: var(--soft); border-radius: 8px; padding: 10px 12px; white-space: pre-wrap; }
.stat { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.stat span { font: 12.5px/1 var(--sans); padding: 7px 10px; background: var(--soft); border-radius: 8px; color: var(--ink-2); }
.stat b { font-family: var(--mono); font-weight: 600; color: var(--ink); }

/* düzenlenebilir tablo girişleri */
.tbl input[type="number"] { width: 72px; padding: 5px 6px; font-family: var(--mono); font-size: 13px; text-align: right; }

/* ---------- kartlar & ızgaralar ---------- */
.grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin: 20px 0; }
.card { background: var(--paper); border: 1px solid var(--rule); border-radius: 12px; padding: 16px 16px 6px; }
.card h4 { margin: 0 0 6px; font-size: 15px; }
.card p, .card li { font-size: 15.5px; line-height: 1.55; }
.card .chip { display: inline-block; font: 700 10.5px/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); margin-bottom: 8px; }

.compare { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin: 20px 0; }
.compare > div { border: 1px solid var(--rule); border-radius: 12px; padding: 14px 16px 4px; background: var(--paper); }
.compare h4 { margin: 0 0 8px; }

/* zaman çizelgesi */
.timeline { position: relative; margin: 24px 0 28px; padding-left: 26px; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 6px; bottom: 6px; width: 2px; background: var(--rule-strong); border-radius: 2px; }
.tl { position: relative; margin: 0 0 20px; }
.tl::before { content: ""; position: absolute; left: -25px; top: 7px; width: 12px; height: 12px; border-radius: 50%; background: var(--paper); border: 3px solid var(--accent); }
.tl .when { font: 700 13px/1.2 var(--sans); color: var(--accent); letter-spacing: .02em; }
.tl p { margin: 4px 0 0; }

/* sınav soruları */
details.q { border: 1px solid var(--rule); border-radius: 12px; background: var(--paper); margin: 12px 0; }
details.q > summary { cursor: pointer; list-style: none; padding: 13px 16px 13px 44px; position: relative; font: 600 15px/1.45 var(--sans); }
details.q > summary::-webkit-details-marker { display: none; }
details.q > summary::before { content: attr(data-n); position: absolute; left: 14px; top: 12px; width: 22px; height: 22px; border-radius: 6px; background: color-mix(in srgb, var(--accent) 14%, transparent); color: var(--accent); font: 700 12px/22px var(--sans); text-align: center; }
details.q[open] > summary { border-bottom: 1px dashed var(--rule); }
details.q .ans { padding: 12px 16px 4px 44px; }
details.q .ans::before { content: "Cevap"; display: block; font: 700 11px/1 var(--sans); letter-spacing: .09em; text-transform: uppercase; color: var(--c-ex); margin-bottom: 8px; }

/* özet kartları */
.cheat { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px; margin: 20px 0; }
.cheat > div { background: var(--paper); border: 1px solid var(--rule); border-radius: 12px; padding: 14px 16px 6px; }
.cheat h4 { margin: 0 0 6px; font-size: 13px; letter-spacing: .02em; color: var(--accent); }
.cheat p, .cheat li { font-size: 15px; line-height: 1.5; }

/* sayfa sonu gezinme */
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 70px; }
.pager a { display: block; border: 1px solid var(--rule); background: var(--paper); border-radius: 12px; padding: 16px 18px; text-decoration: none; color: var(--ink); font-family: var(--sans); }
.pager a:hover { border-color: var(--accent); }
.pager small { display: block; color: var(--ink-3); font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; margin-bottom: 4px; }
.pager b { font-size: 16px; }
.pager .next { text-align: right; grid-column: 2; }

/* KaTeX */
.katex { font-size: 1.06em; }
.katex-display { margin: 18px 0; overflow-x: auto; overflow-y: hidden; padding: 4px 0; }
.eq-box { background: var(--paper); border: 1px solid var(--rule); border-radius: 10px; padding: 6px 16px; margin: 18px 0; }

/* ---------- index ---------- */
.weeks { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); margin: 30px 0; }
.week-card { position: relative; display: flex; flex-direction: column; background: var(--paper); border: 1px solid var(--rule); border-radius: 16px; padding: 22px 22px 18px; text-decoration: none; color: var(--ink); box-shadow: var(--shadow); overflow: hidden; transition: transform .15s ease, border-color .15s ease; }
.week-card:hover { transform: translateY(-2px); border-color: var(--wc); }
.week-card::before { content: ""; position: absolute; inset: 0 0 auto 0; height: 4px; background: var(--wc); }
.week-card .wk { font: 800 12px/1 var(--sans); letter-spacing: .12em; text-transform: uppercase; color: var(--wc); }
.week-card h3 { margin: 10px 0 10px; font-size: 21px; }
.week-card ul { font-size: 15px; line-height: 1.5; padding-left: 18px; color: var(--ink-2); margin-bottom: 14px; }
.week-card .go { margin-top: auto; font: 600 14px var(--sans); color: var(--wc); }
.week-card .src { font: 12px/1.5 var(--sans); color: var(--ink-3); margin-bottom: 12px; }
.grade-bar { display: flex; height: 38px; border-radius: 10px; overflow: hidden; margin: 14px 0 8px; font: 600 12.5px/38px var(--sans); color: #fff; }
.grade-bar div { text-align: center; white-space: nowrap; overflow: hidden; }
.legend-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 0 14px; }
.legend-list .callout { margin: 8px 0; }
.legend-list .callout p { font-size: 15px; }
.filter { width: 100%; font: 15px var(--sans); padding: 10px 12px; border: 1px solid var(--rule-strong); border-radius: 10px; background: var(--paper); color: var(--ink); margin: 6px 0 4px; }

/* ---------- mobil ---------- */
@media (max-width: 980px) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 0; padding: 0 16px; }
  #menuBtn { display: grid; }
  .toc {
    position: fixed; top: 60px; left: 0; bottom: 0; width: min(320px, 86vw); max-height: none;
    background: var(--paper); border-right: 1px solid var(--rule); z-index: 40;
    padding: 20px 14px 40px; transform: translateX(-102%); transition: transform .2s ease;
    box-shadow: var(--shadow);
  }
  body.toc-open .toc { transform: none; }
  .content { padding-top: 24px; }
  .brand small { display: none; }
}
@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .topbar { padding: 0 12px; gap: 8px; }
  .weeknav a { padding: 6px 8px; font-size: 12.5px; }
  .weeknav a .long { display: none; }
  .brand .txt { display: none; }
  h2 { font-size: 24px; margin-top: 60px; }
  .lead { font-size: 18px; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { grid-column: 1; }
}
@media print {
  .topbar, .toc, .progress, .lab, .pager { display: none !important; }
  .layout { display: block; padding: 0; }
  body { background: #fff; color: #000; font-size: 11.5pt; }
  details.q { break-inside: avoid; }
  details.q .ans { display: block; }
}