/* ---------- tokens ---------- */
:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --bg-sunk: #eef2f7;
  --text: #14202e;
  --text-2: #4a5a6d;
  --text-3: #6b7a8c;
  --line: #dde3ea;
  --brand: #0a6ed1;
  --brand-ink: #ffffff;
  --brand-soft: #e6f1fb;
  --accent: #0b1f3a;
  --ok: #188918;
  --ok-soft: #e7f5e7;
  --warn: #b25b00;
  --warn-soft: #fff4e5;
  --code-bg: #f3f5f8;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 4px 12px rgba(16, 24, 40, .06);
  --radius: 10px;
  --top: 56px;
  --side: 300px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e141b; --bg-soft: #131b24; --bg-sunk: #18222d; --text: #e6edf3; --text-2: #b3c0cd; --text-3: #8b99a8;
    --line: #26323f; --brand: #4db1ff; --brand-ink: #06121f; --brand-soft: #102a42; --accent: #e6edf3;
    --ok: #5dd45d; --ok-soft: #12301a; --warn: #ffb347; --warn-soft: #33250f; --code-bg: #161f29;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 12px rgba(0,0,0,.3); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e141b; --bg-soft: #131b24; --bg-sunk: #18222d; --text: #e6edf3; --text-2: #b3c0cd; --text-3: #8b99a8;
  --line: #26323f; --brand: #4db1ff; --brand-ink: #06121f; --brand-soft: #102a42; --accent: #e6edf3;
  --ok: #5dd45d; --ok-soft: #12301a; --warn: #ffb347; --warn-soft: #33250f; --code-bg: #161f29;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 12px rgba(0,0,0,.3); color-scheme: dark;
}

/* ---------- base ---------- */
[hidden] { display: none !important; }
* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--top) + 16px); }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 var(--font); -webkit-font-smoothing: antialiased; }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.skip { position: absolute; left: -999px; top: 8px; z-index: 100; background: var(--brand); color: var(--brand-ink); padding: 8px 12px; border-radius: 6px; }
.skip:focus { left: 8px; }
.muted { color: var(--text-3); }
.small { font-size: 14px; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--text); font: 500 14px/1 var(--font); padding: 10px 14px; border-radius: 8px; cursor: pointer; }
.btn:hover { background: var(--bg-soft); text-decoration: none; }
.btn-primary { background: var(--brand); border-color: var(--brand); color: var(--brand-ink); }
.btn-primary:hover { background: var(--brand); filter: brightness(1.08); }
.btn-ghost { border-color: transparent; color: var(--brand); }
.btn-lg { padding: 13px 18px; font-size: 15px; }
.btn-complete.done { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.btn-complete.done::before { content: "✓"; }
.icon-btn { width: 36px; height: 36px; border: 1px solid var(--line); background: var(--bg); color: var(--text-2); border-radius: 8px; cursor: pointer; display: grid; place-items: center; padding: 0; }

/* ---------- top bar ---------- */
.topbar { position: fixed; inset: 0 0 auto 0; height: var(--top); z-index: 40; display: flex; align-items: center; gap: 16px; padding: 0 16px; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; color: var(--text); letter-spacing: -.01em; }
.brand:hover { text-decoration: none; }
.logo { width: 26px; height: 26px; border-radius: 7px; background: linear-gradient(135deg, #0a6ed1, #0b1f3a); position: relative; }
.logo::after { content: ""; position: absolute; inset: 7px; border-radius: 50%; border: 2px solid #fff; border-right-color: transparent; }
.topnav { display: flex; gap: 18px; margin-left: 12px; }
.topnav a { color: var(--text-2); font-size: 14px; font-weight: 500; }
.top-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.menu-btn { display: none; width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); cursor: pointer; padding: 9px 8px; flex-direction: column; justify-content: space-between; }
.menu-btn span { display: block; height: 2px; background: var(--text-2); border-radius: 2px; }
.avatar { width: 34px; height: 34px; border-radius: 50%; border: 0; background: var(--brand); color: var(--brand-ink); font-weight: 600; cursor: pointer; }
.user-menu { position: relative; }
.menu { position: absolute; right: 0; top: 42px; min-width: 220px; background: var(--bg); border: 1px solid var(--line); border-radius: 10px; box-shadow: var(--shadow); padding: 8px; }
.menu-email { font-size: 13px; color: var(--text-3); padding: 6px 8px 10px; border-bottom: 1px solid var(--line); margin-bottom: 6px; word-break: break-all; }
.menu button { width: 100%; text-align: left; background: none; border: 0; padding: 8px; border-radius: 6px; font: 14px var(--font); color: var(--text); cursor: pointer; }
.menu button:hover { background: var(--bg-soft); }

/* ---------- shell ---------- */
.shell { display: flex; padding-top: var(--top); min-height: 100vh; }
.sidebar { position: sticky; top: var(--top); width: var(--side); flex: 0 0 var(--side); height: calc(100vh - var(--top)); overflow-y: auto; border-right: 1px solid var(--line); background: var(--bg-soft); padding: 16px 12px 40px; }
.main { flex: 1; min-width: 0; padding: 32px clamp(16px, 4vw, 48px) 0; }
.scrim { display: none; }

/* sidebar */
.side-head { padding: 0 4px 12px; border-bottom: 1px solid var(--line); margin-bottom: 10px; }
.progress-summary { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; margin-bottom: 12px; }
.ps-title { font-size: 13px; font-weight: 700; margin-bottom: 10px; }
.ps-track { padding: 6px 8px; margin: 0 -8px 4px; border-radius: 8px; }
.ps-track.current { background: var(--bg-soft); }
.ps-row { display: flex; justify-content: space-between; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.ps-track:not(.current) .ps-row { font-weight: 500; color: var(--text-2); }
.ps-sub { font-size: 12px; color: var(--text-3); margin-top: 4px; }
.bar { height: 6px; border-radius: 6px; background: var(--bg-sunk); overflow: hidden; }
.bar span { display: block; height: 100%; background: var(--ok); border-radius: 6px; transition: width .3s; }
.ps-note { font-size: 12px; color: var(--text-3); margin-top: 8px; }
.ps-gate { margin-top: 10px; padding: 10px; border-radius: 8px; background: var(--brand-soft); font-size: 13px; line-height: 1.45; }
.ps-gate p { margin: 0 0 8px; }
.ps-gate .btn { width: 100%; justify-content: center; padding: 7px 10px; font-size: 13px; }
.progress-summary.locked .ps-track { opacity: .45; }
.search input { width: 100%; padding: 9px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--text); font: 14px var(--font); }
.search-results { list-style: none; margin: 8px 0 0; padding: 0; }
.search-results li a { display: block; padding: 8px 10px; border-radius: 8px; color: var(--text); font-size: 14px; }
.search-results li a:hover { background: var(--bg-sunk); text-decoration: none; }
.search-results .sr-unit { display: block; font-size: 12px; color: var(--text-3); }
.unit { margin: 2px 0; }
.unit summary { list-style: none; display: flex; align-items: center; gap: 10px; padding: 8px 8px; border-radius: 8px; cursor: pointer; font-weight: 600; font-size: 14px; color: var(--text); }
.unit summary::-webkit-details-marker { display: none; }
.unit summary:hover { background: var(--bg-sunk); }
.unit summary::after { content: "›"; margin-left: auto; color: var(--text-3); transition: transform .15s; }
.unit[open] summary::after { transform: rotate(90deg); }
.num { flex: 0 0 22px; height: 22px; border-radius: 6px; background: var(--bg-sunk); color: var(--text-2); font-size: 12px; display: grid; place-items: center; }
.num.dot { color: var(--warn); }
.ut { flex: 1; }
.uc { font-size: 11px; font-weight: 500; color: var(--text-3); }
.unit ul { list-style: none; margin: 2px 0 8px; padding: 0 0 0 16px; }
.unit li a, .unit li.soon > span { display: flex; align-items: flex-start; gap: 10px; padding: 6px 8px; border-radius: 8px; font-size: 14px; line-height: 1.4; color: var(--text-2); }
.unit li a:hover { background: var(--bg-sunk); color: var(--text); text-decoration: none; }
.unit li a[aria-current="page"] { background: var(--brand-soft); color: var(--brand); font-weight: 600; }
.unit li.soon > span { color: var(--text-3); }
.unit li.soon em { margin-left: auto; font-style: normal; font-size: 11px; border: 1px solid var(--line); border-radius: 20px; padding: 0 7px; }
.tick { flex: 0 0 14px; height: 14px; margin-top: 3px; border-radius: 50%; border: 1.5px solid var(--line); background: var(--bg); position: relative; }
.tick.half { border-color: var(--ok); background: linear-gradient(90deg, var(--ok) 50%, var(--bg) 50%); }
.tick.full { border-color: var(--ok); background: var(--ok); }
.tick.full::after { content: ""; position: absolute; left: 4px; top: 1px; width: 3px; height: 7px; border: solid #fff; border-width: 0 1.5px 1.5px 0; transform: rotate(45deg); }
.soon .tick { border-style: dashed; }

/* ---------- topic ---------- */
.topic { max-width: 1120px; }
.crumbs { display: flex; gap: 8px; font-size: 13px; color: var(--text-3); margin-bottom: 12px; }
.crumbs a { color: var(--text-3); }
h1 { font-size: clamp(28px, 3.4vw, 38px); line-height: 1.2; letter-spacing: -.02em; margin: 0 0 12px; }
.lede { font-size: 18px; color: var(--text-2); max-width: 760px; margin: 0 0 14px; }
.meta { display: flex; flex-wrap: wrap; gap: 16px; font-size: 13px; color: var(--text-3); margin-bottom: 24px; }
.layer-tabs { display: inline-flex; gap: 6px; padding: 5px; background: var(--bg-sunk); border-radius: 12px; margin-bottom: 24px; position: sticky; top: calc(var(--top) + 8px); z-index: 5; box-shadow: var(--shadow); }
.layer-tab { display: flex; flex-direction: column; align-items: flex-start; gap: 2px; border: 0; background: none; padding: 9px 16px; border-radius: 9px; cursor: pointer; font-family: var(--font); color: var(--text-2); }
.layer-tab[aria-selected="true"] { background: var(--bg); color: var(--text); box-shadow: var(--shadow); }
.lt-label { font-weight: 600; font-size: 14px; }
.lt-aud { font-size: 12px; color: var(--text-3); }
html:not([data-layer="deep"]) .layer[data-layer="deep"] { display: none; }
html[data-layer="deep"] .layer[data-layer="foundational"] { display: none; }
.layer-intro { font-size: 13px; color: var(--text-3); padding: 10px 14px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg-soft); margin-bottom: 20px; max-width: 760px; }
.layer-grid { display: grid; grid-template-columns: minmax(0, 760px) 220px; gap: 48px; }
.toc { position: sticky; top: calc(var(--top) + 90px); align-self: start; font-size: 13px; border-left: 1px solid var(--line); padding-left: 16px; }
.toc-title { font-weight: 600; color: var(--text-2); margin-bottom: 8px; text-transform: uppercase; letter-spacing: .06em; font-size: 11px; }
.toc ol { list-style: none; margin: 0; padding: 0; }
.toc li { margin: 6px 0; }
.toc a { color: var(--text-3); }
.toc a.active { color: var(--brand); font-weight: 600; }
.complete-row { display: flex; gap: 12px; flex-wrap: wrap; margin: 32px 0 40px; padding-top: 24px; border-top: 1px solid var(--line); max-width: 760px; }
.sources { max-width: 760px; border-top: 1px solid var(--line); padding-top: 12px; }
.sources h2 { font-size: 16px; }
.sources ul { padding-left: 18px; font-size: 14px; }
.sources li { margin: 6px 0; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 760px; margin: 32px 0 40px; }
.pager a { display: block; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; color: var(--text); font-weight: 600; }
.pager a:hover { border-color: var(--brand); text-decoration: none; }
.pager a span { display: block; font-size: 12px; font-weight: 500; color: var(--text-3); margin-bottom: 4px; }
.pager .next { text-align: right; }

/* ---------- prose ---------- */
.prose { min-width: 0; }
.prose.narrow { max-width: 760px; }
.prose h2 { font-size: 24px; line-height: 1.3; letter-spacing: -.01em; margin: 40px 0 12px; }
.prose h3 { font-size: 19px; margin: 28px 0 8px; }
.prose h4 { font-size: 16px; margin: 20px 0 6px; }
.prose h2:first-child { margin-top: 0; }
.prose .anchor { float: left; margin-left: -22px; width: 22px; color: var(--text-3); opacity: 0; font-weight: 400; }
.prose h2:hover .anchor, .prose h3:hover .anchor { opacity: 1; text-decoration: none; }
.prose p, .prose ul, .prose ol { margin: 0 0 16px; }
.prose li { margin: 4px 0; }
.prose code { font-family: var(--mono); font-size: .88em; background: var(--code-bg); padding: 2px 5px; border-radius: 5px; }
.prose .code { position: relative; margin: 0 0 20px; }
.prose pre { margin: 0; background: var(--code-bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; overflow-x: auto; font-size: 13.5px; line-height: 1.55; }
.prose pre code { background: none; padding: 0; font-size: inherit; }
.prose pre code.hljs { background: none; padding: 0; }
.copy { position: absolute; top: 8px; right: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--text-3); font: 12px var(--font); padding: 4px 8px; border-radius: 6px; cursor: pointer; opacity: 0; transition: opacity .15s; }
.code:hover .copy, .copy:focus { opacity: 1; }
.prose pre.mermaid { background: var(--bg); text-align: center; margin: 0 0 20px; }
.prose blockquote { margin: 0 0 16px; padding: 4px 16px; border-left: 3px solid var(--line); color: var(--text-2); }
.callout { margin: 0 0 20px; padding: 14px 16px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--bg-soft); }
.callout p:last-child { margin-bottom: 0; }
.callout-note, .callout-example { border-color: color-mix(in srgb, var(--brand) 35%, var(--line)); background: var(--brand-soft); }
.callout-tip, .callout-try-it { border-color: color-mix(in srgb, var(--ok) 40%, var(--line)); background: var(--ok-soft); }
.callout-warning { border-color: color-mix(in srgb, var(--warn) 45%, var(--line)); background: var(--warn-soft); }
.table-wrap { overflow-x: auto; margin: 0 0 20px; border: 1px solid var(--line); border-radius: var(--radius); }
.prose table { border-collapse: collapse; width: 100%; font-size: 14px; }
.prose th, .prose td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { background: var(--bg-soft); font-weight: 600; }
.prose tr:last-child td { border-bottom: 0; }

/* review quiz */
.qa { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px 10px; margin: 0 0 20px; background: var(--bg-soft); }
.qa-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; font-size: 14px; color: var(--text-2); margin-bottom: 8px; }
.qa-score { font-weight: 600; color: var(--text); }
.prose .qa-list { list-style: none; padding: 0; margin: 0; }
.qa-item { border-top: 1px solid var(--line); padding: 14px 0; margin: 0 !important; }
.prose .qa-q { display: flex; gap: 10px; margin: 0 0 10px; font-weight: 600; }
.qa-n { flex: 0 0 24px; height: 24px; border-radius: 50%; background: var(--brand-soft); color: var(--brand); font-size: 12px; display: grid; place-items: center; margin-top: 1px; }
.qa-opts { display: grid; gap: 8px; margin-left: 34px; }
.qa-opt { display: flex; align-items: flex-start; gap: 10px; text-align: left; width: 100%; border: 1px solid var(--line); background: var(--bg); color: var(--text); border-radius: 8px; padding: 9px 12px; font: 15px/1.5 var(--font); cursor: pointer; }
.qa-opt:hover:not(:disabled) { border-color: var(--brand); }
.qa-opt:disabled { cursor: default; }
.qa-letter { flex: 0 0 22px; height: 22px; border-radius: 6px; background: var(--bg-sunk); color: var(--text-2); font-size: 12px; font-weight: 600; display: grid; place-items: center; margin-top: 1px; }
.qa-opt code { font-size: .85em; }
.answered .qa-opt:not(.is-correct):not(.is-chosen) { opacity: .6; }
.qa-opt.is-correct { border-color: var(--ok); background: var(--ok-soft); }
.qa-opt.is-correct .qa-letter { background: var(--ok); color: #fff; }
.qa-opt.is-chosen:not(.is-correct) { border-color: var(--warn); background: var(--warn-soft); }
.qa-opt.is-chosen:not(.is-correct) .qa-letter { background: var(--warn); color: #fff; }
.qa-why { margin: 10px 0 0 34px; padding: 10px 12px; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; font-size: 15px; }
.right .qa-verdict { color: var(--ok); }
.wrong .qa-verdict { color: var(--warn); }
html.js .qa-item:not(.answered) .qa-why { display: none; }
html.js .qa-key { display: none; }
.qa-foot { display: flex; justify-content: flex-end; }
.qa-foot .btn { padding: 6px 10px; }

/* ---------- home ---------- */
.hero { max-width: 820px; padding: 24px 0 32px; }
.eyebrow { text-transform: uppercase; letter-spacing: .1em; font-size: 12px; font-weight: 600; color: var(--brand); margin: 0 0 12px; }
.hero h1 { font-size: clamp(32px, 4.6vw, 50px); }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 20px 0 12px; }
.personas { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; max-width: 1000px; margin-bottom: 48px; }
.persona-card { text-align: left; display: flex; flex-direction: column; gap: 6px; border: 1px solid var(--line); border-radius: 14px; background: var(--bg); padding: 20px; cursor: pointer; font-family: var(--font); color: var(--text); box-shadow: var(--shadow); }
.persona-card:hover { border-color: var(--brand); }
.persona-card.selected { border-color: var(--brand); outline: 2px solid var(--brand); }
.pc-label { font-weight: 700; font-size: 17px; }
.pc-aud { font-size: 13px; color: var(--brand); font-weight: 600; }
.pc-blurb { color: var(--text-2); font-size: 14px; }
.pc-pick { margin-top: 8px; font-size: 13px; color: var(--text-3); }
.persona-card.selected .pc-pick::before { content: "✓ "; color: var(--ok); }
.curriculum { max-width: 1000px; }
.curriculum h2, .latest h2 { font-size: 26px; margin: 0 0 6px; letter-spacing: -.01em; }
.unit-grid { list-style: none; padding: 0; margin: 20px 0 48px; display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 14px; }
.unit-card { display: flex; gap: 14px; border: 1px solid var(--line); border-radius: 14px; padding: 16px; background: var(--bg); }
.uc-num { flex: 0 0 34px; height: 34px; border-radius: 9px; background: var(--brand-soft); color: var(--brand); font-weight: 700; display: grid; place-items: center; }
.uc-body h3 { font-size: 16px; margin: 4px 0 6px; }
.uc-body h3 a { color: var(--text); }
.uc-body p { font-size: 14px; color: var(--text-2); margin: 0 0 10px; }
.uc-meta { display: flex; justify-content: space-between; gap: 8px; font-size: 12px; color: var(--text-3); }
.uc-prog { color: var(--ok); font-weight: 600; }
.latest { max-width: 820px; margin-bottom: 48px; }
.latest ul { list-style: none; padding: 0; margin: 12px 0 0; }
.latest li { display: flex; justify-content: space-between; gap: 16px; padding: 10px 0; border-bottom: 1px solid var(--line); }

/* ---------- footer ---------- */
.footer { border-top: 1px solid var(--line); margin-top: 24px; padding: 24px 0 40px; font-size: 13px; color: var(--text-3); max-width: 1120px; }
.footer p { margin: 0 0 6px; }

/* ---------- auth dialog ---------- */
.auth-dialog { border: 1px solid var(--line); border-radius: 16px; padding: 0; width: min(420px, calc(100vw - 32px)); background: var(--bg); color: var(--text); box-shadow: var(--shadow); }
.auth-dialog::backdrop { background: rgba(10, 16, 24, .45); }
.auth-form { position: relative; display: flex; flex-direction: column; gap: 12px; padding: 28px 24px 22px; }
.auth-form h2 { margin: 0; font-size: 20px; }
.auth-form p { margin: 0; }
.auth-form label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 500; }
.auth-form input { padding: 11px 12px; border: 1px solid var(--line); border-radius: 8px; font: 15px var(--font); background: var(--bg); color: var(--text); }
.auth-form .btn { justify-content: center; }
.or { display: flex; align-items: center; gap: 10px; color: var(--text-3); font-size: 12px; }
.or::before, .or::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.auth-msg { font-size: 14px; min-height: 20px; color: var(--text-2); }
.profile-dialog { width: min(620px, calc(100vw - 32px)); max-height: calc(100vh - 32px); }
.pf-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.profile-form select, .profile-form textarea { padding: 9px 10px; border: 1px solid var(--line); border-radius: 8px; font: 14px var(--font); background: var(--bg); color: var(--text); }
.pf-multi { grid-column: 1 / -1; border: 0; padding: 0; margin: 0; }
.pf-multi legend { font-size: 14px; font-weight: 500; margin-bottom: 6px; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { flex-direction: row !important; align-items: center; gap: 0 !important; font-weight: 400 !important; }
.chip input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.chip span { border: 1px solid var(--line); border-radius: 20px; padding: 5px 11px; font-size: 13px; cursor: pointer; }
.chip input:checked + span { background: var(--brand-soft); border-color: var(--brand); color: var(--brand); }
.chip input:focus-visible + span { outline: 2px solid var(--brand); outline-offset: 2px; }
.profile-actions { display: flex; gap: 10px; }
.close { position: absolute; top: 10px; right: 12px; border: 0; background: none; font-size: 22px; color: var(--text-3); cursor: pointer; }

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .layer-grid { grid-template-columns: minmax(0, 760px); }
  .toc { display: none; }
}
@media (max-width: 900px) {
  .menu-btn { display: flex; }
  .topnav { display: none; }
  .sidebar { position: fixed; left: 0; top: var(--top); z-index: 30; transform: translateX(-100%); transition: transform .2s; box-shadow: var(--shadow); width: min(86vw, var(--side)); }
  body.nav-open .sidebar { transform: none; }
  body.nav-open .scrim { display: block; position: fixed; inset: var(--top) 0 0 0; background: rgba(10, 16, 24, .4); z-index: 20; }
  .main { padding-top: 24px; }
  .layer-tabs { display: flex; width: 100%; }
  .layer-tab { flex: 1; }
  .pager { grid-template-columns: 1fr; }
  .pager .next { text-align: left; }
}
@media (max-width: 560px) {
  .pf-grid { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .lt-aud { display: none; }
  .brand { font-size: 15px; }
}
@media print {
  .topbar, .sidebar, .layer-tabs, .complete-row, .pager, .toc { display: none !important; }
  .shell { padding-top: 0; }
  .layer { display: block !important; }
  .qa-why { display: block !important; }
  .qa-key { display: inline !important; }
}

/* ---------- questions ---------- */
.menu a { display: block; padding: 8px; border-radius: 6px; font: 14px var(--font); color: var(--text); text-decoration: none; }
.menu a:hover { background: var(--bg-soft); }
.ask { max-width: 760px; margin: 8px 0 24px; padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg-soft); }
.ask-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.ask-title { font-size: 20px; margin: 0; }
.ask-badge { font-size: 12px; padding: 2px 8px; border-radius: 20px; background: var(--warn-soft); color: var(--warn); border: 1px solid var(--warn); }
.ask > p { margin: 8px 0 14px; font-size: 14px; }
.ask-form { display: grid; gap: 12px; }
.ask-form label { display: grid; gap: 6px; font-size: 14px; font-weight: 500; }
.ask-form select, .ask-form textarea, .rv-label textarea { padding: 9px 10px; border: 1px solid var(--line); border-radius: 8px; font: 15px/1.5 var(--font); background: var(--bg); color: var(--text); width: 100%; box-sizing: border-box; }
.ask-form textarea { resize: vertical; }
.ask-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.ask-form label.check { display: flex; align-items: center; gap: 8px; font-weight: 500; }
.ask-count { font-size: 12px; color: var(--text-3); }
.ask-note { font-size: 12.5px; color: var(--text-3); margin: -4px 0 0; }
.ask-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.ask-msg { margin: 0; font-size: 14px; }
.ask-signin p { margin: 0 0 10px; font-size: 14px; }
.ask-about { margin-left: 10px; vertical-align: middle; font: 500 12px var(--font); color: var(--brand); background: none; border: 1px solid var(--line); border-radius: 20px; padding: 2px 9px; cursor: pointer; opacity: 0; transition: opacity .15s; }
.prose h2:hover .ask-about, .ask-about:focus-visible { opacity: 1; }
@media (hover: none) { .ask-about { opacity: 1; } }

.qa-page .ps-gate, .qa-review .ps-gate { max-width: 420px; }
.myq-item, .rv-item { border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; margin: 0 0 14px; background: var(--bg); }
.myq-meta { display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: center; font-size: 13px; color: var(--text-3); }
.myq-where { font-size: 14px; margin: 6px 0 8px; color: var(--text-2); }
.myq-q p, .myq-answer p { margin: 0 0 8px; }
.myq-q { font-size: 15.5px; }
.myq-answer { margin-top: 10px; padding: 12px 14px; border-radius: 8px; background: var(--ok-soft); border: 1px solid var(--ok); font-size: 15px; }
.myq-answer.closed { background: var(--bg-soft); border-color: var(--line); }
.myq-answer-label { font-size: 12px; font-weight: 600; color: var(--text-2); margin-bottom: 6px; text-transform: uppercase; letter-spacing: .03em; }
.myq-answer ul, .myq-answer ol { margin: 0 0 8px 20px; padding: 0; }
.myq-sources { font-size: 13px; color: var(--text-3); margin-top: 8px; }
.myq-sources ul { margin: 4px 0 0 18px; padding: 0; }
.myq-withdraw { margin-top: 6px; padding: 4px 8px; font-size: 13px; }
.qa-chip { display: inline-block; font-size: 12px; font-weight: 600; padding: 2px 8px; border-radius: 20px; background: var(--bg-sunk); color: var(--text-2); }
.qa-chip.s-answered { background: var(--ok-soft); color: var(--ok); }
.qa-chip.s-waiting, .qa-chip.s-queued, .qa-chip.s-claimed { background: var(--brand-soft); color: var(--brand); }
.qa-chip.s-in_review, .qa-chip.s-draft { background: var(--brand-soft); color: var(--brand); }
.qa-chip.s-needs_rt { background: var(--warn-soft); color: var(--warn); }

.qa-review { max-width: 900px; margin: 0 auto; padding: 8px 0 24px; }
.qa-review h1 { margin: 0 0 6px; }
.review-filters { display: flex; gap: 8px; flex-wrap: wrap; margin: 16px 0; }
.review-tab { border: 1px solid var(--line); background: var(--bg); color: var(--text); border-radius: 20px; padding: 6px 12px; font: 500 14px var(--font); cursor: pointer; }
.review-tab span { color: var(--text-3); margin-left: 4px; }
.review-tab.on { border-color: var(--brand); background: var(--brand-soft); color: var(--brand); }
.rv-asker { font-size: 13px; color: var(--text-3); margin-bottom: 8px; }
.rv-flag { background: var(--warn-soft); border: 1px solid var(--warn); border-radius: 8px; padding: 8px 10px; font-size: 14px; }
.rv-label { display: grid; gap: 6px; font-size: 14px; font-weight: 500; margin-top: 12px; }
.rv-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-top: 12px; }
.rv-msg { font-size: 13px; color: var(--text-3); }
@media print { .ask, .ask-about { display: none !important; } }