/* Groundwork — design tokens */
:root {
  --paper: #ffffff;
  --chrome: #f4f6f9;
  --chrome-2: #e8ecf2;
  --ink: #14181f;
  --ink-2: #3c4350;
  --ink-3: #687180;
  --ink-4: #a2a9b5;
  --rule: #e1e5eb;
  --rule-2: #cbd2dc;
  --accent: #2459c4;
  --accent-ink: #ffffff;
  --accent-soft: #edf2fc;
  --accent-line: #bccdef;
  --brand: #17325e;
  --brand-ink: #ffffff;
  --brand-text: #17325e;
  --brand-soft: #e9eef6;
  --hero-bg: #17325e;
  --hero-ink: #ffffff;
  --hero-ink-2: #c3d0e6;
  --hero-rule: rgba(255, 255, 255, .16);
  --ok: #2c7653;
  --ok-soft: #edf5f0;
  --warn: #9a5c00;
  --warn-soft: #fbf4e8;
  --bad: #ad3328;
  --bad-soft: #fbefed;
  --code-bg: #f7f8fa;
  --code-ink: #24272b;
  --sel: #d7e3f4;
  --shadow: 0 1px 2px rgba(20, 22, 26, .06), 0 8px 24px rgba(20, 22, 26, .08);

  --sans: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", Meiryo, sans-serif;
  --serif: var(--sans);
  --latin-serif: var(--sans);
  --mono: "SF Mono", ui-monospace, Menlo, Monaco, "Hiragino Sans", monospace;

  --fs: 16.5px;
  --measure: 700px;
  --side: 272px;
  --rail: 236px;

  /* syntax */
  --t-kw: #8a2f8f;
  --t-str: #1d6b3a;
  --t-num: #9a4a00;
  --t-com: #8a8f96;
  --t-fn: #1f56a3;
  --t-bi: #0e6b77;
  --t-dec: #8a5a00;

  color-scheme: light;
}

:root[data-theme="dark"] {
  --paper: #16191e;
  --chrome: #1d2128;
  --chrome-2: #272c35;
  --ink: #e8eaee;
  --ink-2: #bcc2cc;
  --ink-3: #8a93a1;
  --ink-4: #5e6673;
  --rule: #2d333d;
  --rule-2: #3b424e;
  --accent: #8cb0f2;
  --accent-ink: #0f1420;
  --accent-soft: #1d2a40;
  --accent-line: #34496e;
  --brand: #2f5597;
  --brand-ink: #ffffff;
  --brand-text: #a9c3f3;
  --brand-soft: #1e293b;
  --hero-bg: #1c2b46;
  --hero-ink: #f1f4fa;
  --hero-ink-2: #aebcd5;
  --hero-rule: rgba(255, 255, 255, .12);
  --ok: #7cc49f;
  --ok-soft: #1b2a22;
  --warn: #e0b064;
  --warn-soft: #2c2419;
  --bad: #ec8b80;
  --bad-soft: #31201e;
  --code-bg: #1c1f25;
  --code-ink: #dedfdb;
  --sel: #2f4466;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 10px 30px rgba(0, 0, 0, .35);
  --t-kw: #d49ad8;
  --t-str: #9fd3a8;
  --t-num: #e5ac74;
  --t-com: #7c8189;
  --t-fn: #94b8f0;
  --t-bi: #7fcbd4;
  --t-dec: #e0c070;
  color-scheme: dark;
}

:root[data-size="s"] { --fs: 15px; }
:root[data-size="l"] { --fs: 18px; --measure: 740px; }

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: var(--sans);
  font-size: var(--fs);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: normal;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--sel); }
[hidden] { display: none !important; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }
code, pre, kbd, textarea.code-input { font-family: var(--mono); }
kbd {
  font-size: 11px; line-height: 1; padding: 3px 5px; border-radius: 4px;
  border: 1px solid var(--rule-2); color: var(--ink-3); background: var(--paper);
}
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- shell ---------- */
.app { display: grid; grid-template-columns: var(--side) 1fr; height: 100vh; }
.app.collapsed { grid-template-columns: 0 1fr; }
.app.collapsed .side { visibility: hidden; }
.side {
  background: var(--chrome);
  border-right: 1px solid var(--rule);
  display: flex; flex-direction: column;
  min-height: 0; overflow: hidden;
}
.side-top { padding: 18px 16px 10px; }
.wordmark {
  display: flex; align-items: baseline; justify-content: space-between;
  font-size: 19px; font-weight: 700; letter-spacing: -.01em; color: var(--brand-text);
  padding: 0 6px 14px;
}
.wordmark a { color: inherit; }
.wordmark a:hover { text-decoration: none; }
.wordmark small { font-family: var(--sans); font-size: 11px; color: var(--ink-3); letter-spacing: 0; }
.search-btn {
  width: 100%; display: flex; align-items: center; justify-content: space-between;
  padding: 7px 10px; border: 1px solid var(--rule-2); border-radius: 7px; background: var(--paper);
  color: var(--ink-3); font-size: 13px;
}
.search-btn:hover { border-color: var(--ink-4); }
.nav { padding: 6px 10px 8px; display: grid; gap: 1px; }
.nav a {
  display: flex; justify-content: space-between; align-items: center;
  color: var(--ink-2); font-size: 14px; padding: 5px 10px; border-radius: 6px; line-height: 1.6;
}
.nav a:hover { background: var(--chrome-2); text-decoration: none; }
.nav a.on { background: var(--brand); color: var(--brand-ink); font-weight: 600; }
.nav a.on .count { background: var(--brand-ink); color: var(--brand); }
.nav .count { font-size: 12px; color: var(--paper); background: var(--accent); border-radius: 9px; padding: 0 7px; font-weight: 600; line-height: 18px; }
.nav .count:empty { display: none; }
.tree { flex: 1; overflow: auto; padding: 4px 10px 20px; border-top: 1px solid var(--rule); margin-top: 6px; }
.tree-goal { font-size: 12px; color: var(--ink-3); padding: 12px 10px 6px; display: flex; justify-content: space-between; }
.tree-goal a { color: var(--ink-3); }
.part-h {
  width: 100%; display: grid; grid-template-columns: 18px 1fr auto; align-items: center; gap: 6px;
  border: 0; background: none; text-align: left; padding: 6px 8px 6px 6px; border-radius: 6px;
  font-size: 13px; color: var(--ink-2); font-weight: 600; line-height: 1.5;
}
.part-h:hover { background: var(--chrome-2); }
.part-h .num { font-weight: 700; font-size: 12.5px; color: var(--brand-text); text-align: center; font-variant-numeric: tabular-nums; }
.part-h .frac { font-weight: 400; font-size: 11px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.part-items { display: none; padding: 1px 0 6px; }
.part.open .part-items { display: block; }
.ti {
  display: grid; grid-template-columns: 18px 1fr; gap: 6px; align-items: baseline;
  padding: 3px 8px 3px 6px; border-radius: 6px; color: var(--ink-2); font-size: 13px; line-height: 1.55;
}
.ti:hover { background: var(--chrome-2); text-decoration: none; }
.ti.on { background: var(--accent-soft); color: var(--brand-text); font-weight: 600; box-shadow: inset 3px 0 0 var(--brand); }
.ti.dim { color: var(--ink-4); }
.ti .mk { justify-self: center; align-self: start; margin-top: 7px; top: 0; }
.ti.projrow { color: var(--ink-2); }
.ti.projrow small { color: var(--brand-text); font-weight: 700; margin-right: 6px; font-size: 11.5px; }
.side-foot {
  border-top: 1px solid var(--rule); padding: 10px 16px 12px; font-size: 12px; color: var(--ink-3);
  display: flex; justify-content: space-between; align-items: center;
}
.side-foot a { color: var(--ink-3); }

/* status mark: hollow, half, full */
.mk { width: 9px; height: 9px; border-radius: 50%; border: 1.5px solid var(--ink-4); display: inline-block; position: relative; top: -1px; }
.mk.seen { border-color: var(--accent); background: linear-gradient(90deg, var(--accent) 50%, transparent 50%); }
.mk.done { border-color: var(--ok); background: var(--ok); }
.mk.mk-proj { border-radius: 2px; }

.main { overflow: auto; min-width: 0; position: relative; scroll-behavior: auto; }
.topbar {
  position: sticky; top: 0; z-index: 20; height: 46px; display: flex; align-items: center; gap: 10px;
  padding: 0 20px; background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid transparent; font-size: 13px; color: var(--ink-3);
}
.topbar.scrolled { border-bottom-color: var(--rule); }
.topbar .crumb { flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar .crumb a { color: var(--ink-3); }
.topbar .crumb b { color: var(--ink-2); font-weight: 600; }
.icon-btn {
  border: 0; background: none; width: 30px; height: 30px; border-radius: 6px; display: grid; place-items: center; color: var(--ink-3);
}
.icon-btn:hover { background: var(--chrome); color: var(--ink); }
.icon-btn svg { width: 17px; height: 17px; stroke: currentColor; fill: none; stroke-width: 1.5; }
.progress-line { position: absolute; left: 0; bottom: -1px; height: 2px; background: var(--brand); width: 0; transition: width .1s linear; }

.view { padding: 28px 48px 120px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--rule-2); background: var(--paper);
  color: var(--ink); border-radius: 7px; padding: 5px 12px; font-size: 13px; line-height: 1.5; white-space: nowrap;
}
.btn:hover { border-color: var(--ink-4); text-decoration: none; }
.btn.primary { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); font-weight: 600; }
.btn.primary:hover { opacity: .88; }
.btn.accent { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.btn.quiet { border-color: transparent; background: none; color: var(--ink-3); padding-left: 8px; padding-right: 8px; }
.btn.quiet:hover { color: var(--ink); background: var(--chrome); }
.btn.lg { font-size: 15px; padding: 9px 20px; border-radius: 8px; }
.btn:disabled { opacity: .45; cursor: default; }
.btn kbd { background: transparent; border-color: currentColor; color: inherit; opacity: .55; font-size: 10px; padding: 2px 4px; }

/* ---------- tags ---------- */
.pri { font-size: 11.5px; font-weight: 600; letter-spacing: .02em; padding: 1px 7px; border-radius: 4px; white-space: nowrap; line-height: 18px; display: inline-block; }
.pri.p必須 { background: var(--brand); color: var(--brand-ink); }
.pri.p推奨 { background: var(--accent-soft); color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent-line); }
.pri.p任意 { color: var(--ink-3); box-shadow: inset 0 0 0 1px var(--rule-2); }
.pri.p不要 { color: var(--ink-4); text-decoration: line-through; box-shadow: inset 0 0 0 1px var(--rule); }

/* ---------- article ---------- */
.reader { display: grid; grid-template-columns: minmax(0, var(--measure)) var(--rail); gap: 56px; justify-content: center; }
.reader.norail { grid-template-columns: minmax(0, var(--measure)); }
.article { min-width: 0; }
.ch-head { padding: 26px 0 30px; border-bottom: 1px solid var(--rule); margin-bottom: 34px; }
.ch-kicker { font-size: 13px; color: var(--ink-3); margin-bottom: 14px; display: flex; gap: 14px; align-items: baseline; flex-wrap: wrap; }
.ch-kicker a { color: var(--ink-3); }
.ch-id { font-size: 12.5px; font-weight: 700; color: var(--brand-ink); background: var(--brand); padding: 1px 9px; border-radius: 5px; letter-spacing: .02em; font-variant-numeric: tabular-nums; }
h1.ch-title {
  font-weight: 700; font-size: 34px; line-height: 1.4; letter-spacing: .01em;
  margin: 0 0 14px; text-wrap: balance;
}
.ch-lead { font-size: 1.06em; color: var(--ink-2); line-height: 1.85; margin: 0 0 22px; }
.ch-meta { display: flex; flex-wrap: wrap; gap: 8px 22px; font-size: 13px; color: var(--ink-3); align-items: center; }
.ch-meta b { color: var(--ink-2); font-weight: 600; margin-left: 4px; }
.ch-meta .pre a { margin-right: 6px; }
.outcomes { margin-top: 26px; padding: 18px 22px 16px; background: var(--brand-soft); border-radius: 10px; }
.outcomes h2 { font-size: 13px !important; margin: 0 0 8px !important; color: var(--brand-text); font-family: var(--sans) !important; letter-spacing: 0; padding: 0 !important; border: 0 !important; }
.outcomes ul { margin: 0; padding-left: 1.2em; font-size: .94em; line-height: 1.8; }
.outcomes li { margin: 3px 0; }
.skipnote { margin-top: 14px; font-size: 13.5px; color: var(--ink-2); line-height: 1.75; padding-left: 14px; border-left: 2px solid var(--rule-2); }

.prose h2 {
  font-weight: 700; font-size: 1.5em; line-height: 1.5; letter-spacing: .01em; text-wrap: balance;
  margin: 3em 0 1em; padding: 0 0 .45em; scroll-margin-top: 64px; position: relative;
  border-bottom: 1px solid var(--rule);
}
.prose h2::after { content: ""; position: absolute; left: 0; bottom: -1px; width: 56px; height: 2px; background: var(--brand); }
.prose h3 { font-size: 1.14em; line-height: 1.6; margin: 2.3em 0 .6em; font-weight: 700; scroll-margin-top: 64px; color: var(--brand-text); }
.prose h4 { font-size: 1em; margin: 1.8em 0 .4em; }
.prose p { margin: 0 0 1.15em; }
.prose ul, .prose ol { margin: 0 0 1.2em; padding-left: 1.5em; }
.prose li { margin: .28em 0; }
.prose li > p { margin: 0 0 .4em; }
.prose strong { font-weight: 700; background: linear-gradient(transparent 62%, color-mix(in srgb, var(--accent) 16%, transparent) 62%); }
.prose code { font-size: .86em; background: var(--code-bg); border: 1px solid var(--rule); padding: .08em .36em; border-radius: 4px; word-break: break-word; }
.prose a code { color: var(--accent); }
.prose blockquote { margin: 1.2em 0; padding: .2em 0 .2em 1.1em; border-left: 3px solid var(--rule-2); color: var(--ink-2); }
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 2.4em 0; }
.prose a.xref { font-weight: 600; white-space: nowrap; }
.prose a.xref[data-title]::after { content: " " attr(data-title); font-weight: 400; white-space: normal; }
.table-wrap { overflow-x: auto; margin: 1.4em 0 1.6em; }
.prose table { border-collapse: collapse; font-size: .875em; line-height: 1.7; min-width: 60%; }
.prose th { text-align: left; font-weight: 700; border-bottom: 1.5px solid var(--ink-3); padding: 7px 14px 7px 0; vertical-align: bottom; }
.prose td { border-bottom: 1px solid var(--rule); padding: 8px 14px 8px 0; vertical-align: top; }
.prose th:last-child, .prose td:last-child { padding-right: 0; }
.prose img { max-width: 100%; }

/* code blocks */
.code {
  margin: 1.5em 0 1.7em; border: 1px solid var(--rule); border-radius: 9px; overflow: hidden; background: var(--code-bg);
  font-size: 13.5px;
}
.code-h {
  display: flex; align-items: center; gap: 8px; padding: 6px 8px 6px 14px; border-bottom: 1px solid var(--rule);
  background: var(--paper); font-size: 12px; color: var(--ink-3); min-height: 38px;
}
.code-h .lbl { flex: 1; display: flex; gap: 10px; align-items: baseline; min-width: 0; }
.code-h .lbl b { color: var(--ink-2); font-weight: 600; }
.code-h .btn { font-size: 12px; padding: 3px 10px; }
.code pre { margin: 0; padding: 14px 16px; overflow-x: auto; line-height: 1.7; color: var(--code-ink); tab-size: 4; }
.code.static pre { white-space: pre; }
.code.term pre { background: #1d1f22; color: #e4e5e1; }
.code.term .code-h { background: #26282c; color: #9a9ea5; border-bottom-color: #34363b; }
.code.term .code-h b { color: #d8d9d5; }
.code.term .code-h .btn { background: transparent; color: #c9cac6; border-color: #45484e; }
.code.text pre { background: var(--paper); color: var(--ink-2); }

/* editable cell */
.editor { position: relative; }
.editor pre, .editor textarea {
  margin: 0; padding: 14px 16px; font-family: var(--mono); font-size: 13.5px; line-height: 1.7; tab-size: 4;
  white-space: pre; overflow-wrap: normal; letter-spacing: 0; border: 0;
}
.editor pre { pointer-events: none; color: var(--code-ink); min-height: 100%; overflow: hidden; }
.editor textarea {
  position: absolute; inset: 0; width: 100%; height: 100%; resize: none; background: transparent; color: transparent;
  caret-color: var(--ink); outline: none; overflow: hidden;
}
.editor textarea::selection { background: var(--sel); color: transparent; }
.editor-scroll { overflow-x: auto; }
.editor-inner { position: relative; min-width: max-content; }
.cell.edited .code-h .lbl::after { content: "編集中"; font-size: 11px; color: var(--warn); }
.out {
  border-top: 1px solid var(--rule); background: var(--paper); padding: 10px 16px 12px; font-family: var(--mono);
  font-size: 13px; line-height: 1.65; white-space: pre-wrap; word-break: break-word; color: var(--ink-2);
  max-height: 520px; overflow: auto;
}
.out:empty { display: none; }
.out .err { color: var(--bad); }
.out .muted { color: var(--ink-3); font-family: var(--sans); font-size: 12.5px; }
.out img { display: block; max-width: 100%; background: #fff; border-radius: 4px; margin: 8px 0; }
.out .files { font-family: var(--sans); font-size: 12px; color: var(--ink-3); margin-top: 8px; }
.out .files button { border: 0; background: none; color: var(--accent); padding: 0 6px 0 0; font-size: 12px; }
.predict-box { border-top: 1px solid var(--rule); background: var(--warn-soft); padding: 10px 14px; display: grid; gap: 6px; font-size: 13px; }
.predict-box label { color: var(--ink-2); font-weight: 600; font-size: 12.5px; }
.predict-box textarea {
  width: 100%; min-height: 44px; resize: vertical; border: 1px solid var(--rule-2); border-radius: 6px; padding: 6px 9px;
  font-family: var(--mono); font-size: 13px; background: var(--paper);
}
.running .run-btn { opacity: .6; }
.out .stop-btn { font-family: var(--sans); font-size: 12px; padding: 2px 10px; margin-top: 6px; }
.spin { display: inline-block; width: 11px; height: 11px; border: 1.5px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: spin .8s linear infinite; vertical-align: -1px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* syntax */
.tk-kw { color: var(--t-kw); }
.tk-str { color: var(--t-str); }
.tk-num { color: var(--t-num); }
.tk-com { color: var(--t-com); font-style: italic; }
.tk-fn { color: var(--t-fn); }
.tk-bi { color: var(--t-bi); }
.tk-dec { color: var(--t-dec); }
.tk-bool { color: var(--t-num); }
.tk-self { color: var(--t-kw); font-style: italic; }
.tk-prompt { color: var(--ink-3); user-select: none; }

/* callouts */
.box { margin: 1.7em 0; padding: 14px 18px 4px; border-radius: 0 9px 9px 0; border-left: 3px solid var(--rule-2); background: var(--chrome); font-size: .95em; }
.box > .box-h { font-weight: 700; font-size: 13px; margin-bottom: 6px; display: flex; gap: 10px; align-items: baseline; color: var(--ink-2); }
.box > .box-h span { font-weight: 600; color: var(--ink); font-size: 14px; }
.box .code { background: var(--paper); }
.box p:last-child { margin-bottom: 1em; }
.box.note { }
.box.tip { border-left-color: var(--ok); background: var(--ok-soft); }
.box.tip > .box-h { color: var(--ok); }
.box.warn { border-left-color: var(--bad); background: var(--bad-soft); }
.box.warn > .box-h { color: var(--bad); }
.box.mistake { border-left-color: var(--warn); background: var(--warn-soft); }
.box.mistake > .box-h { color: var(--warn); }
.box.ai { border-left-color: var(--accent); background: var(--accent-soft); }
.box.ai > .box-h { color: var(--accent); }
.box.pro { border-left-color: var(--ink); background: var(--chrome); }
.box.pro > .box-h { color: var(--ink); }
details.box.deep { padding: 0; background: none; border: 1px solid var(--rule); border-radius: 9px; }
details.box.deep > summary {
  list-style: none; cursor: pointer; padding: 12px 18px; display: flex; gap: 10px; align-items: baseline; font-size: 14px;
}
details.box.deep > summary::-webkit-details-marker { display: none; }
details.box.deep > summary::before { content: ""; width: 7px; height: 7px; border-right: 1.5px solid var(--ink-3); border-bottom: 1.5px solid var(--ink-3); transform: rotate(-45deg); position: relative; top: -2px; transition: transform .15s; flex: none; }
details.box.deep[open] > summary::before { transform: rotate(45deg); }
details.box.deep > summary b { font-size: 12px; color: var(--ink-3); font-weight: 600; }
details.box.deep > summary span { font-weight: 600; }
details.box.deep > .deep-body { padding: 2px 20px 8px; border-top: 1px solid var(--rule); }

/* prompt template */
.prompt { margin: 1.7em 0; border: 1px solid var(--accent-line); border-radius: 9px; overflow: hidden; }
.prompt-h { display: flex; align-items: center; gap: 10px; padding: 7px 8px 7px 16px; background: var(--accent-soft); font-size: 12.5px; color: var(--accent); }
.prompt-h span { flex: 1; font-weight: 600; }
.prompt-h span em { font-style: normal; color: var(--ink); font-weight: 600; margin-left: 8px; }
.prompt pre { margin: 0; padding: 14px 18px; white-space: pre-wrap; font-family: var(--sans); font-size: .9em; line-height: 1.8; color: var(--ink); background: var(--paper); }
.prompt .ph { color: var(--accent); background: var(--accent-soft); border-radius: 3px; padding: 0 2px; }

/* steps */
.box.steps { background: none; border: 0; padding: 0; }
.box.steps > ol { list-style: none; counter-reset: st; padding: 0; margin: 0; }
.box.steps > ol > li { counter-increment: st; position: relative; padding: 0 0 14px 46px; margin: 0; min-height: 34px; }
.box.steps > ol > li::before {
  content: counter(st); position: absolute; left: 0; top: -2px; width: 30px; height: 30px; border-radius: 50%;
  border: 0; display: grid; place-items: center; font-size: 13px; font-weight: 700; color: var(--brand-ink); background: var(--brand);
}
.box.steps > ol > li::after { content: ""; position: absolute; left: 15px; top: 30px; bottom: 2px; width: 1px; background: var(--rule); }
.box.steps > ol > li:last-child::after { display: none; }

/* flow */
.flow { margin: 1.8em 0 2em; display: grid; gap: 12px; }
.flow-row { display: flex; flex-wrap: wrap; align-items: stretch; gap: 6px 0; }
.flow-step { display: flex; align-items: center; }
.flow-step .fs { border: 1px solid var(--rule-2); border-radius: 7px; padding: 6px 12px; background: var(--paper); font-size: 13.5px; line-height: 1.45; max-width: 220px; }
.flow-step .fs small { display: block; font-size: 11.5px; color: var(--ink-3); margin-top: 1px; }
.flow-step:first-child .fs { background: var(--chrome); }
.flow-step:last-child .fs { border-color: var(--ink-3); }
.flow-step + .flow-step::before { content: ""; width: 22px; height: 1px; background: var(--ink-4); position: relative; margin: 0 2px; }
.flow-step + .flow-step .fs { position: relative; }
.flow-step + .flow-step::after { content: none; }
.flow-arrow { width: 0; height: 0; border-left: 5px solid var(--ink-4); border-top: 4px solid transparent; border-bottom: 4px solid transparent; margin-right: 4px; }

/* checklist */
.checklist { margin: 1.4em 0 1.8em; padding: 6px 0; display: grid; gap: 2px; }
.checklist label { display: grid; grid-template-columns: 22px 1fr; gap: 8px; align-items: start; padding: 6px 10px; border-radius: 7px; cursor: pointer; font-size: .95em; line-height: 1.7; }
.checklist label:hover { background: var(--chrome); }
.checklist input { margin: 5px 0 0; width: 15px; height: 15px; accent-color: var(--accent); }
.checklist input:checked + span { color: var(--ink-3); text-decoration: line-through; text-decoration-color: var(--ink-4); }

/* exercise */
.ex { margin: 2.2em 0; border: 1px solid var(--accent-line); border-radius: 11px; overflow: hidden; background: var(--paper); }
.ex-h { padding: 13px 20px 11px; border-bottom: 1px solid var(--rule); display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap; background: var(--brand-soft); }
.ex-h .n { font-size: 12.5px; font-weight: 700; color: var(--brand-text); }
.ex-h .t { font-weight: 700; font-size: 1.02em; flex: 1; min-width: 200px; }
.ex-h .lv { font-size: 12px; color: var(--ink-3); }
.ex-h .st { font-size: 12px; font-weight: 600; color: var(--ink-3); }
.ex.passed .ex-h .st { color: var(--ok); }
.ex-p { padding: 16px 20px 4px; font-size: .96em; }
.ex .code { margin: 0 20px 14px; }
.ex-bar { display: flex; gap: 8px; align-items: center; padding: 0 20px 16px; flex-wrap: wrap; }
.ex-bar .sp { flex: 1; }
.verdict { margin: 0 20px 16px; padding: 10px 14px; border-radius: 8px; font-size: 13.5px; line-height: 1.7; white-space: pre-wrap; }
.verdict:empty { display: none; }
.verdict.ok { background: var(--ok-soft); color: var(--ok); }
.verdict.ng { background: var(--bad-soft); color: var(--bad); }
.verdict b { display: block; margin-bottom: 2px; }
.hints { margin: 0 20px 14px; display: grid; gap: 8px; }
.hint { border-left: 3px solid var(--ok); background: var(--ok-soft); padding: 8px 14px 1px; border-radius: 0 7px 7px 0; font-size: .93em; }
.hint b { font-size: 12px; color: var(--ok); display: block; }
.solution { margin: 0 20px 18px; border-top: 1px dashed var(--rule-2); padding-top: 14px; }
.solution > b { font-size: 12.5px; color: var(--ink-3); display: block; margin-bottom: 4px; }
.solution .code { margin: 8px 0 12px; }
.answer-area { margin: 0 20px 14px; }
.answer-area textarea { width: 100%; min-height: 150px; border: 1px solid var(--rule-2); border-radius: 8px; padding: 10px 12px; font-size: 14px; line-height: 1.8; resize: vertical; background: var(--paper); }

/* quiz */
.quiz { margin: 1.5em 0 2em; display: grid; gap: 28px; }
.q { }
.q-n { font-size: 13px; font-weight: 700; color: var(--brand-text); margin-bottom: 4px; display: flex; gap: 10px; align-items: baseline; }
.q-n .res { font-family: var(--sans); font-size: 12px; font-weight: 600; }
.q-n .res.ok { color: var(--ok); }
.q-n .res.ng { color: var(--bad); }
.q-q { font-weight: 600; margin-bottom: 10px; }
.q-q p { margin: 0 0 .5em; }
.q-q .code { font-weight: 400; margin: .6em 0; }
.q-opts { display: grid; gap: 6px; }
.q-opt {
  display: grid; grid-template-columns: 26px 1fr; gap: 8px; text-align: left; border: 1px solid var(--rule-2); background: var(--paper);
  border-radius: 8px; padding: 8px 14px 8px 10px; font-size: .94em; line-height: 1.65; align-items: baseline;
}
.q-opt:hover:not(:disabled) { border-color: var(--ink-3); }
.q-opt .k { font-weight: 700; font-size: 12.5px; color: var(--ink-3); text-align: center; }
.q-opt:disabled { cursor: default; }
.q-opt.correct { border-color: var(--ok); background: var(--ok-soft); }
.q-opt.correct .k { color: var(--ok); }
.q-opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.q-opt.dim { opacity: .55; }
.q-e { margin-top: 10px; padding: 10px 16px 2px; border-radius: 8px; background: var(--chrome); font-size: .92em; }
.q-e b { font-size: 12.5px; }
.q-retry { margin-top: 6px; }

/* chapter end */
.ch-end { margin-top: 64px; border-top: 1px solid var(--rule); padding-top: 28px; }
.done-panel { display: grid; grid-template-columns: 1fr auto; gap: 18px; align-items: center; padding: 20px 22px; border-radius: 11px; background: var(--chrome); }
.done-panel h3 { margin: 0 0 4px; font-size: 16px; }
.done-panel p { margin: 0; font-size: 13px; color: var(--ink-3); line-height: 1.7; }
.done-panel .stats { display: flex; gap: 18px; margin-top: 8px; font-size: 13px; color: var(--ink-2); }
.done-panel .stats b { font-variant-numeric: tabular-nums; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 22px; }
.pager a { border: 1px solid var(--rule); border-radius: 10px; padding: 12px 16px; color: var(--ink); display: block; }
.pager a:hover { border-color: var(--ink-4); text-decoration: none; }
.pager a small { display: block; font-size: 12px; color: var(--ink-3); }
.pager a.next { text-align: right; grid-column: 2; }
.refs { margin-top: 30px; font-size: 13.5px; }
.refs h3 { font-size: 13px; color: var(--ink-3); font-weight: 600; margin: 0 0 6px; }
.refs ul { margin: 0; padding-left: 1.2em; line-height: 1.9; }

/* rail */
.rail { position: sticky; top: 64px; align-self: start; max-height: calc(100vh - 80px); overflow: auto; font-size: 13px; padding-bottom: 20px; }
.rail h4 { font-size: 12px; color: var(--ink-3); font-weight: 600; margin: 0 0 6px; }
.toc { display: grid; gap: 0; border-left: 1px solid var(--rule); margin-bottom: 26px; }
.toc a { color: var(--ink-3); padding: 3px 0 3px 12px; line-height: 1.5; margin-left: -1px; border-left: 2px solid transparent; }
.toc a.l3 { padding-left: 24px; font-size: 12px; }
.toc a:hover { color: var(--ink); text-decoration: none; }
.toc a.on { color: var(--ink); border-left-color: var(--accent); font-weight: 600; }
.rail-note textarea {
  width: 100%; min-height: 170px; resize: vertical; border: 1px solid var(--rule); border-radius: 8px; padding: 9px 11px;
  font-size: 13px; line-height: 1.75; background: var(--chrome);
}
.rail-note textarea:focus { background: var(--paper); border-color: var(--rule-2); outline: none; }
.rail-note .saved { font-size: 11px; color: var(--ink-4); height: 16px; }
.rail-actions { display: grid; gap: 4px; margin-top: 20px; }
.rail-actions a, .rail-actions button { text-align: left; border: 0; background: none; padding: 3px 0; color: var(--ink-3); font-size: 13px; }
.rail-actions a:hover, .rail-actions button:hover { color: var(--ink); }

/* ---------- home ---------- */
.page { max-width: 1040px; margin: 0 auto; }
.page-h { margin: 18px 0 30px; }
.page-h h1 { font-weight: 700; font-size: 30px; margin: 0 0 6px; letter-spacing: .01em; }
.page-h p { margin: 0; color: var(--ink-3); font-size: 14px; }
.hero { display: grid; grid-template-columns: 1.5fr 1fr; gap: 40px; padding: 34px 40px 36px; margin-top: 10px; border-radius: 14px; background: var(--hero-bg); color: var(--hero-ink); }
.hero .k { font-size: 13px; color: var(--hero-ink-2); margin-bottom: 10px; }
.hero h1 { font-size: 36px; line-height: 1.38; margin: 0 0 12px; font-weight: 700; letter-spacing: .01em; text-wrap: balance; }
.hero h1 a { color: inherit; }
.hero .lead { color: var(--hero-ink-2); margin: 0 0 24px; }
.hero .acts { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; color: var(--hero-ink-2); font-size: 13px; }
.hero .btn.primary { background: var(--hero-ink); color: var(--hero-bg); border-color: var(--hero-ink); }
.hero .pri.p必須 { background: var(--hero-ink); color: var(--hero-bg); }
.hero-side { border-left: 1px solid var(--hero-rule); padding-left: 32px; display: grid; gap: 18px; align-content: start; font-size: 13.5px; }
.hero-side a { color: var(--hero-ink); text-decoration: underline; text-underline-offset: 3px; }
.hero-side p { color: var(--hero-ink-2) !important; }
.stat-row { display: grid; grid-template-columns: 1fr; gap: 0; }
.stat-row .v { font-size: 26px; font-weight: 700; line-height: 1.2; font-variant-numeric: tabular-nums; }
.stat-row .v small { font-size: 13px; font-weight: 400; color: var(--hero-ink-2); margin-left: 3px; }
.stat-row .l { color: var(--hero-ink-2); font-size: 12.5px; line-height: 1.6; margin: 2px 0 16px; }

.route { padding: 34px 0 8px; }
.route-h { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 18px; }
.route-h h2 { font-size: 15px; margin: 0; color: var(--brand-text); }
.route-h p { margin: 0; font-size: 13px; color: var(--ink-3); }
.route-line { display: grid; grid-template-columns: repeat(10, 1fr); gap: 4px; }
.seg { position: relative; display: block; color: var(--ink); padding-top: 14px; }
.seg:hover { text-decoration: none; }
.seg .bar { height: 6px; border-radius: 3px; background: var(--chrome-2); overflow: hidden; }
.seg .bar i { display: block; height: 100%; background: var(--accent); border-radius: 3px; }
.seg .sn { font-size: 15px; font-weight: 700; margin-top: 8px; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.seg .st { font-size: 12px; color: var(--ink-3); line-height: 1.45; }
.seg.cur .sn { color: var(--brand-text); }
.seg.cur .bar { box-shadow: 0 0 0 1.5px var(--brand); }
.seg.cur .st { color: var(--ink); font-weight: 600; }
.seg:hover .st { color: var(--ink); }

.home-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 48px; padding-top: 30px; margin-top: 30px; border-top: 1px solid var(--rule); }
.home-grid h2 { font-size: 15px; margin: 0 0 12px; color: var(--brand-text); }
.home-grid section { padding-bottom: 28px; }
.list-plain { list-style: none; margin: 0; padding: 0; }
.list-plain li { border-bottom: 1px solid var(--rule); }
.list-plain li:last-child { border-bottom: 0; }
.list-plain a { display: grid; grid-template-columns: 48px 1fr auto; gap: 10px; padding: 9px 0; color: var(--ink); font-size: 14px; align-items: baseline; }
.list-plain a:hover { text-decoration: none; }
.list-plain a:hover .tt { text-decoration: underline; text-underline-offset: 3px; }
.list-plain .id { color: var(--brand-text); font-size: 12.5px; font-weight: 700; font-variant-numeric: tabular-nums; }
.list-plain .meta { font-size: 12px; color: var(--ink-3); }
.goal-pick { display: grid; gap: 8px; }
.goal-opt { display: grid; grid-template-columns: 18px 1fr; gap: 10px; text-align: left; border: 1px solid var(--rule); background: var(--paper); border-radius: 9px; padding: 11px 14px; font-size: 13px; line-height: 1.65; color: var(--ink-2); }
.goal-opt:hover { border-color: var(--ink-4); }
.goal-opt b { color: var(--ink); font-size: 14px; display: block; }
.goal-opt .radio { width: 14px; height: 14px; border-radius: 50%; border: 1.5px solid var(--ink-4); margin-top: 4px; }
.goal-opt.on { border-color: var(--brand); background: var(--brand-soft); }
.goal-opt.on .radio { border: 4.5px solid var(--brand); }
.empty { color: var(--ink-3); font-size: 13.5px; padding: 8px 0; }

/* ---------- course ---------- */
.course-tools { display: flex; gap: 18px; align-items: center; font-size: 13px; color: var(--ink-3); margin: -10px 0 26px; flex-wrap: wrap; }
.seg-ctl { display: inline-flex; border: 1px solid var(--rule-2); border-radius: 7px; overflow: hidden; }
.seg-ctl button { border: 0; background: var(--paper); padding: 4px 12px; font-size: 13px; color: var(--ink-2); }
.seg-ctl button + button { border-left: 1px solid var(--rule-2); }
.seg-ctl button.on { background: var(--brand); color: var(--brand-ink); }
.legend { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.legend span { display: inline-flex; gap: 6px; align-items: center; }
.part-sec { display: grid; grid-template-columns: 76px 1fr; gap: 0 26px; padding: 30px 0 34px; border-top: 1px solid var(--rule); }
.part-num { font-size: 13px; font-weight: 700; line-height: 1; color: var(--brand-ink); background: var(--brand); width: 64px; padding: 9px 0; text-align: center; border-radius: 8px; align-self: start; margin-top: 4px; letter-spacing: .04em; }
.part-num::before { content: "PART "; font-weight: 600; font-size: 10.5px; opacity: .75; }
.part-sec.cur .part-num { background: var(--accent); }
.part-body h2 { font-weight: 700; font-size: 23px; margin: 0 0 2px; letter-spacing: .01em; }
.part-body .sub { font-size: 13.5px; color: var(--ink-3); margin-bottom: 14px; }
.part-can { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; font-size: 14px; line-height: 1.75; margin-bottom: 18px; max-width: 780px; }
.part-can dt { color: var(--ink-3); font-size: 12.5px; padding-top: 2px; white-space: nowrap; }
.part-can dd { margin: 0; color: var(--ink-2); }
.ch-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.ch-table td { border-top: 1px solid var(--rule); padding: 9px 12px 9px 0; vertical-align: baseline; }
.ch-table tr:hover td { background: color-mix(in srgb, var(--chrome) 60%, transparent); }
.ch-table td.c-mk { width: 22px; vertical-align: top; padding-top: 14px; }
.ch-table td.c-id { width: 52px; color: var(--brand-text); font-weight: 700; font-size: 12.5px; font-variant-numeric: tabular-nums; }
.ch-table td.c-t a { color: var(--ink); font-weight: 500; }
.ch-table td.c-t small { display: block; color: var(--ink-3); font-size: 12.5px; line-height: 1.6; margin-top: 1px; }
.ch-table td.c-env { width: 116px; font-size: 12px; color: var(--ink-3); white-space: nowrap; }
.ch-table td.c-min { width: 64px; text-align: right; font-size: 12.5px; color: var(--ink-3); font-variant-numeric: tabular-nums; white-space: nowrap; }
.ch-table td.c-pri { width: 52px; text-align: right; padding-right: 0; }
.ch-table tr.dim td.c-t a, .ch-table tr.dim td.c-id { color: var(--ink-4); }
.ch-table tr.row-proj td { background: var(--chrome); }
.ch-table tr.hidden { display: none; }

/* projects page */
.proj-list { display: grid; gap: 0; }
.proj-card { display: grid; grid-template-columns: 64px 1fr 160px; gap: 24px; padding: 24px 0; border-top: 1px solid var(--rule); color: var(--ink); }
.proj-card:hover { text-decoration: none; }
.proj-card:hover h2 { text-decoration: underline; text-underline-offset: 4px; }
.proj-card .pn { font-size: 18px; font-weight: 700; color: var(--brand-ink); background: var(--brand); width: 56px; height: 56px; border-radius: 12px; display: grid; place-items: center; }
.proj-card h2 { font-weight: 700; font-size: 19px; margin: 0 0 6px; }
.proj-card p { margin: 0; color: var(--ink-2); font-size: 14px; line-height: 1.8; }
.proj-card .side-info { font-size: 12.5px; color: var(--ink-3); display: grid; gap: 4px; align-content: start; justify-items: end; text-align: right; }

/* review */
.review-card { max-width: var(--measure); margin: 0 auto; }
.modal-bg { position: fixed; inset: 0; background: rgba(12, 18, 30, .35); z-index: 150; display: grid; place-items: center; padding: 16px; }
.modal { background: var(--paper); border-radius: 12px; box-shadow: var(--shadow), 0 0 0 1px var(--rule); width: min(440px, 100%); padding: 22px 24px 18px; }
.modal p { margin: 0 0 18px; font-size: 14.5px; line-height: 1.8; white-space: pre-wrap; }
.modal .acts { display: flex; justify-content: flex-end; gap: 8px; }
.btn.danger { background: var(--bad); border-color: var(--bad); color: #fff; font-weight: 600; }
.review-top { display: flex; justify-content: space-between; align-items: baseline; font-size: 13px; color: var(--ink-3); margin-bottom: 18px; }
.review-src { font-size: 12.5px; color: var(--ink-3); margin-top: 18px; }

/* notes */
.notes-list { max-width: 820px; }
.note-item { border-top: 1px solid var(--rule); padding: 18px 0; }
.note-item h3 { margin: 0 0 6px; font-size: 15px; }
.note-item h3 a { color: var(--ink); }
.note-item pre { margin: 0; white-space: pre-wrap; font-family: var(--sans); font-size: 14px; line-height: 1.8; color: var(--ink-2); }

/* settings */
.settings { max-width: 760px; }
.set-row { display: grid; grid-template-columns: 200px 1fr; gap: 24px; padding: 20px 0; border-top: 1px solid var(--rule); }
.set-row h3 { font-size: 14px; margin: 0 0 2px; }
.set-row p { margin: 0; font-size: 12.5px; color: var(--ink-3); line-height: 1.7; }
.set-row .ctl { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; font-size: 14px; }
.set-row input[type=number] { width: 80px; border: 1px solid var(--rule-2); border-radius: 6px; padding: 4px 8px; background: var(--paper); }

/* palette */
.palette-bg { position: fixed; inset: 0; background: rgba(15, 17, 20, .28); z-index: 100; display: none; }
.palette-bg.open { display: block; }
.palette {
  position: fixed; left: 50%; top: 12vh; transform: translateX(-50%); width: min(680px, 92vw); max-height: 70vh; display: flex; flex-direction: column;
  background: var(--paper); border-radius: 12px; box-shadow: var(--shadow), 0 0 0 1px var(--rule); overflow: hidden; z-index: 101;
}
.palette input { border: 0; border-bottom: 1px solid var(--rule); padding: 16px 20px; font-size: 17px; outline: none; background: var(--paper); }
.pal-res { overflow: auto; padding: 6px; }
.pal-item { display: block; padding: 9px 14px; border-radius: 8px; color: var(--ink); font-size: 14px; }
.pal-item:hover { text-decoration: none; }
.pal-item.on { background: var(--accent-soft); }
.pal-item .pt { display: flex; gap: 10px; align-items: baseline; }
.pal-item .pt small { color: var(--brand-text); font-weight: 700; font-size: 12px; }
.pal-item .ps { font-size: 12.5px; color: var(--ink-3); margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pal-item mark { background: color-mix(in srgb, var(--accent) 20%, transparent); color: inherit; border-radius: 2px; }
.pal-foot { border-top: 1px solid var(--rule); padding: 8px 16px; font-size: 12px; color: var(--ink-3); display: flex; gap: 16px; }

.toast {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%) translateY(20px); background: var(--ink); color: var(--paper);
  padding: 9px 18px; border-radius: 8px; font-size: 13px; opacity: 0; pointer-events: none; transition: all .2s; z-index: 200;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.loading { color: var(--ink-3); font-size: 13px; padding: 40px 0; }

/* responsiveness: MacBook first, still usable narrower */
@media (max-width: 1320px) {
  :root { --rail: 200px; }
  .reader { gap: 40px; }
  .view { padding: 24px 36px 120px; }
}
@media (max-width: 1140px) {
  .reader { grid-template-columns: minmax(0, var(--measure)); }
  /* no room beside the text: put the notes and actions under the chapter instead of hiding them */
  .rail { position: static; max-height: none; overflow: visible; border-top: 1px solid var(--rule); padding-top: 24px; }
  .rail > h4:first-child, .rail .toc { display: none; }
  .rail-note textarea { min-height: 120px; }
  .hero { grid-template-columns: 1fr; }
  .hero-side { border-left: 0; padding-left: 0; border-top: 1px solid var(--rule); padding-top: 20px; }
}
@media (max-width: 860px) {
  .app { grid-template-columns: 0 1fr; }
  .main { grid-column: 2; min-width: 0; }
  .side { position: fixed; left: 0; top: 0; bottom: 0; width: var(--side); z-index: 50; visibility: hidden; transform: translateX(-100%); transition: transform .2s; }
  .app.mobile-open .side { visibility: visible; transform: none; box-shadow: var(--shadow); }
  .view { padding: 18px 18px 100px; }
  .home-grid, .route-line { grid-template-columns: 1fr; }
  .part-sec { grid-template-columns: 1fr; }
  .proj-card { grid-template-columns: 1fr; }
  .set-row { grid-template-columns: 1fr; }
  h1.ch-title { font-size: 30px; }
  .ch-table td.c-env { display: none; }
  /* code block header: label on its own line, buttons wrap below instead of squeezing the label into a column */
  .code-h { flex-wrap: wrap; row-gap: 6px; justify-content: flex-end; }
  .code-h .lbl { flex: 1 0 100%; flex-wrap: wrap; row-gap: 0; }
  .code-h .lbl b { white-space: nowrap; }
  .code-h .btn { white-space: nowrap; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }
@media print {
  .side, .topbar, .rail, .ch-end .pager, .code-h .btn { display: none !important; }
  .app { display: block; height: auto; }
  .main { overflow: visible; }
}

/* glossary */
.gl-tools { display: grid; gap: 12px; margin: -6px 0 18px; position: sticky; top: 46px; background: var(--paper); padding: 10px 0 12px; z-index: 5; border-bottom: 1px solid var(--rule); }
.gl-search { border: 1px solid var(--rule-2); border-radius: 8px; padding: 8px 12px; font-size: 15px; max-width: 420px; background: var(--paper); }
.gl-cats { display: flex; gap: 6px; flex-wrap: wrap; }
.gl-cats button { border: 1px solid var(--rule-2); background: var(--paper); border-radius: 14px; padding: 2px 12px; font-size: 12.5px; color: var(--ink-2); }
.gl-cats button.on { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.gl-list { margin: 0; columns: 2; column-gap: 48px; }
.gl-item { break-inside: avoid; padding: 12px 0 14px; border-bottom: 1px solid var(--rule); }
.gl-item dt { font-weight: 700; font-size: 15px; }
.gl-item dt small { font-weight: 400; color: var(--ink-3); font-size: 12.5px; margin-left: 10px; }
.gl-item dd { margin: 4px 0 0; font-size: 13.5px; line-height: 1.8; color: var(--ink-2); }
.gl-ref { display: flex; flex-wrap: wrap; gap: 4px 14px; margin-top: 4px; font-size: 12px; }
@media (max-width: 1100px) { .gl-list { columns: 1; } }

/* grid children must be allowed to shrink so wide code scrolls inside its own box */
.quiz > *, .q-opts > *, .hints > *, .checklist > *, .flow > *, .reader > *, .home-grid > *, .hero > *, .part-sec > *, .set-row > *, .proj-card > *, .done-panel > *, .pager > * { min-width: 0; }
.q-q .code, .q-e .code, .ex-p .code, .box .code { max-width: 100%; }

/* iOS Safari zooms into any field under 16px when it gets focus; keep the page still while typing */
@supports (-webkit-touch-callout: none) {
  .editor pre, .editor textarea, .predict-box textarea, .answer-area textarea, .rail-note textarea, .gl-search, .set-row input { font-size: 16px; }
}