/* AZ-104 Refresher — shared styles */
:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-2: #f0f3f7;
  --ink: #1b2330;
  --ink-2: #4a5566;
  --muted: #6b7686;
  --line: #dde3ea;
  --accent: #0f6cbd;
  --accent-soft: #e6f0fa;
  --lab: #0e7a6b;
  --lab-soft: #e3f4f1;
  --exam: #b5560b;
  --exam-soft: #fdf1e6;
  --az305: #6b3fb3;
  --az305-soft: #f1ebfa;
  --warn: #b42318;
  --warn-soft: #fdecea;
  --ok: #1f7a3a;
  --ok-soft: #e7f5ec;
  --code-bg: #f2f4f7;
  --note: #8a6a00;
  --note-soft: #fff7d1;
  /* diagram tokens */
  --d-line: #6b7686;
  --d-gray: #eef1f5;
  --d-blue: #dcebfa;
  --d-blue-s: #3b82c4;
  --d-green: #dff3e8;
  --d-green-s: #2f8f5b;
  --d-orange: #fdecd9;
  --d-orange-s: #c2701d;
  --d-purple: #ece4f8;
  --d-purple-s: #7a52bf;
  --d-red: #fbe1de;
  --d-red-s: #c0392b;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12161c; --surface: #1a1f27; --surface-2: #222833; --ink: #e6e9ee; --ink-2: #b8c0cc; --muted: #8d97a5; --line: #2e3643;
    --accent: #5aa9f0; --accent-soft: #1b2b3d; --lab: #43c2ad; --lab-soft: #163029; --exam: #f0a35e; --exam-soft: #33261a;
    --az305: #b394ec; --az305-soft: #2a2238; --warn: #f2877c; --warn-soft: #3a1f1d; --ok: #6fd08e; --ok-soft: #18301f; --code-bg: #141920; --note: #e6c65a; --note-soft: #2c2716;
    --d-line: #8d97a5; --d-gray: #262d38; --d-blue: #1d3550; --d-blue-s: #5aa9f0; --d-green: #183a2a; --d-green-s: #5cc58a;
    --d-orange: #3d2c18; --d-orange-s: #f0a35e; --d-purple: #2e2442; --d-purple-s: #b394ec; --d-red: #3f2220; --d-red-s: #f2877c;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #12161c; --surface: #1a1f27; --surface-2: #222833; --ink: #e6e9ee; --ink-2: #b8c0cc; --muted: #8d97a5; --line: #2e3643;
  --accent: #5aa9f0; --accent-soft: #1b2b3d; --lab: #43c2ad; --lab-soft: #163029; --exam: #f0a35e; --exam-soft: #33261a;
  --az305: #b394ec; --az305-soft: #2a2238; --warn: #f2877c; --warn-soft: #3a1f1d; --ok: #6fd08e; --ok-soft: #18301f; --code-bg: #141920; --note: #e6c65a; --note-soft: #2c2716;
  --d-line: #8d97a5; --d-gray: #262d38; --d-blue: #1d3550; --d-blue-s: #5aa9f0; --d-green: #183a2a; --d-green-s: #5cc58a;
  --d-orange: #3d2c18; --d-orange-s: #f0a35e; --d-purple: #2e2442; --d-purple-s: #b394ec; --d-red: #3f2220; --d-red-s: #f2877c;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 18px/1.72 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); text-underline-offset: 2px; }
strong { font-weight: 650; color: var(--ink); }
code, pre, kbd { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 0.86em; }
:not(pre) > code { background: var(--code-bg); border: 1px solid var(--line); padding: 0.08em 0.35em; border-radius: 5px; word-break: break-word; }
pre { background: var(--code-bg); border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; overflow-x: auto; line-height: 1.5; position: relative; }
pre code { font-size: 0.82em; }
.copy-btn { position: absolute; top: 6px; right: 6px; font: 12px system-ui, sans-serif; padding: 3px 8px; border-radius: 6px; border: 1px solid var(--line); background: var(--surface); color: var(--ink-2); cursor: pointer; opacity: .8; }
.copy-btn:hover { opacity: 1; }

/* top bar */
.topbar { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--surface) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.topbar-inner { max-width: 1120px; margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; gap: 14px; font-size: 15px; }
.topbar .brand { font-weight: 700; color: var(--ink); text-decoration: none; white-space: nowrap; }
.topbar .crumb { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.theme-btn { border: 1px solid var(--line); background: var(--surface-2); color: var(--ink-2); border-radius: 8px; padding: 4px 10px; cursor: pointer; font: inherit; font-size: 14px; }

/* layout */
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; display: grid; grid-template-columns: minmax(0, 1fr); gap: 40px; }
@media (min-width: 1040px) { .wrap.with-toc { grid-template-columns: minmax(0, 760px) 240px; justify-content: center; } }
main { min-width: 0; padding: 28px 0 80px; }
.wrap:not(.with-toc) main { max-width: 820px; margin: 0 auto; width: 100%; }
.toc { display: none; }
@media (min-width: 1040px) {
  .toc { display: block; position: sticky; top: 64px; align-self: start; padding-top: 34px; font-size: 14px; max-height: calc(100vh - 80px); overflow-y: auto; }
  .toc p { font-weight: 650; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; font-size: 12px; margin: 0 0 8px; }
  .toc a { display: block; color: var(--ink-2); text-decoration: none; padding: 4px 0 4px 10px; border-left: 2px solid var(--line); line-height: 1.35; }
  .toc a.lab-link { color: var(--lab); }
  .toc a:hover { color: var(--accent); border-color: var(--accent); }
}

/* headings */
h1 { font-size: 2.05rem; line-height: 1.2; margin: 0.2em 0 0.3em; letter-spacing: -0.01em; }
h2 { font-size: 1.5rem; line-height: 1.3; margin: 2.2em 0 0.6em; padding-top: 0.4em; border-top: 1px solid var(--line); scroll-margin-top: 70px; }
h3 { font-size: 1.18rem; margin: 1.8em 0 0.4em; scroll-margin-top: 70px; }
h4 { font-size: 1.02rem; margin: 1.2em 0 0.3em; }
p, ul, ol { margin: 0.7em 0; }
li { margin: 0.28em 0; }
li > ul, li > ol { margin: 0.2em 0; }
.lede { font-size: 1.1rem; color: var(--ink-2); }

.meta { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 18px; }
.badge { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; padding: 3px 10px; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--line); color: var(--ink-2); }
.badge.theory { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.badge.lab { background: var(--lab-soft); color: var(--lab); border-color: transparent; }
.badge.weight { background: var(--exam-soft); color: var(--exam); border-color: transparent; }

/* part banners */
.part { margin: 2.6em 0 0; padding: 16px 20px; border-radius: var(--radius); display: flex; gap: 14px; align-items: center; }
.part .num { font-weight: 800; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; }
.part h2 { margin: 0; padding: 0; border: 0; font-size: 1.4rem; }
.part.theory { background: var(--accent-soft); color: var(--accent); }
.part.lab { background: var(--lab-soft); color: var(--lab); }
.part.theory h2, .part.lab h2 { color: inherit; }

/* callouts */
.callout { border: 1px solid var(--line); border-left: 4px solid var(--accent); background: var(--surface); border-radius: 8px; padding: 12px 16px; margin: 1.2em 0; }
.callout > :first-child { margin-top: 0; }
.callout > :last-child { margin-bottom: 0; }
.callout .ct { font-weight: 700; font-size: 0.82rem; letter-spacing: .06em; text-transform: uppercase; margin-bottom: 4px; display: block; }
.callout.note { border-left-color: var(--accent); }
.callout.note .ct { color: var(--accent); }
.callout.exam { border-left-color: var(--exam); background: var(--exam-soft); border-color: transparent; border-left-color: var(--exam); }
.callout.exam .ct { color: var(--exam); }
.callout.az305 { background: var(--az305-soft); border-color: transparent; border-left-color: var(--az305); }
.callout.az305 .ct { color: var(--az305); }
.callout.warn { background: var(--warn-soft); border-color: transparent; border-left-color: var(--warn); }
.callout.warn .ct { color: var(--warn); }
.callout.cost { background: var(--ok-soft); border-color: transparent; border-left-color: var(--ok); }
.callout.cost .ct { color: var(--ok); }
.callout.checkpoint { background: var(--lab-soft); border-color: transparent; border-left-color: var(--lab); }
.callout.checkpoint .ct { color: var(--lab); }

/* tables */
.table-wrap { overflow-x: auto; margin: 1em 0; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 0.9rem; line-height: 1.5; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--surface-2); font-weight: 650; }
tr:last-child td { border-bottom: 0; }

/* diagrams */
figure.diagram { margin: 1.4em 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; }
figure.diagram svg { width: 100%; height: auto; display: block; }
figcaption { font-size: 0.86rem; color: var(--muted); margin-top: 8px; text-align: center; }
svg text { font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; fill: var(--ink); }
svg .t { font-size: 14px; }
svg .tb { font-size: 14px; font-weight: 650; }
svg .ts { font-size: 12px; fill: var(--ink-2); }
svg .tl { font-size: 16px; font-weight: 700; }
svg .ln { stroke: var(--d-line); stroke-width: 1.6; fill: none; }
svg .ln-d { stroke: var(--d-line); stroke-width: 1.4; fill: none; stroke-dasharray: 5 4; }
svg .ah { fill: var(--d-line); }
svg .gray { fill: var(--d-gray); stroke: var(--d-line); stroke-width: 1.2; }
svg .blue { fill: var(--d-blue); stroke: var(--d-blue-s); stroke-width: 1.4; }
svg .green { fill: var(--d-green); stroke: var(--d-green-s); stroke-width: 1.4; }
svg .orange { fill: var(--d-orange); stroke: var(--d-orange-s); stroke-width: 1.4; }
svg .purple { fill: var(--d-purple); stroke: var(--d-purple-s); stroke-width: 1.4; }
svg .red { fill: var(--d-red); stroke: var(--d-red-s); stroke-width: 1.4; }
svg .zone { fill: none; stroke: var(--d-line); stroke-width: 1.3; stroke-dasharray: 6 5; }
svg .bg { fill: var(--surface-2); stroke: var(--line); stroke-width: 1; }
svg .s-blue { stroke: var(--d-blue-s); } svg .s-green { stroke: var(--d-green-s); } svg .s-red { stroke: var(--d-red-s); } svg .s-orange { stroke: var(--d-orange-s); } svg .s-purple { stroke: var(--d-purple-s); }
svg .c-blue { fill: var(--d-blue-s); } svg .c-green { fill: var(--d-green-s); } svg .c-red { fill: var(--d-red-s); } svg .c-orange { fill: var(--d-orange-s); } svg .c-purple { fill: var(--d-purple-s); }

/* quiz */
.quiz { margin: 1.4em 0; }
.q { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; margin: 14px 0; }
.q .qt { font-weight: 600; margin: 0 0 10px; }
.q .opts { display: grid; gap: 8px; }
.q button.opt { text-align: left; font: inherit; font-size: 0.95rem; line-height: 1.45; padding: 9px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface-2); color: var(--ink); cursor: pointer; }
.q button.opt:hover { border-color: var(--accent); }
.q button.opt.correct { background: var(--ok-soft); border-color: var(--ok); }
.q button.opt.wrong { background: var(--warn-soft); border-color: var(--warn); }
.q .why { display: none; margin-top: 10px; font-size: 0.95rem; color: var(--ink-2); border-top: 1px dashed var(--line); padding-top: 10px; }
.q.answered .why { display: block; }

/* lab steps */
ol.steps { list-style: none; padding: 0; counter-reset: step; }
ol.steps > li { counter-increment: step; position: relative; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 18px 14px 58px; margin: 14px 0; }
ol.steps > li::before { content: counter(step); position: absolute; left: 16px; top: 14px; width: 28px; height: 28px; border-radius: 50%; background: var(--lab-soft); color: var(--lab); font-weight: 750; font-size: 14px; display: grid; place-items: center; }
ol.steps > li.done { opacity: 0.62; }
ol.steps > li.done::before { content: "✓"; background: var(--lab); color: var(--surface); }
ol.steps > li > h4:first-child { margin-top: 2px; }
.step-check { position: absolute; right: 14px; top: 14px; font-size: 13px; color: var(--muted); display: flex; gap: 5px; align-items: center; cursor: pointer; user-select: none; }
.step-check input { accent-color: var(--lab); width: 16px; height: 16px; cursor: pointer; }
ol.steps > li > h4:first-child { padding-right: 64px; }
details.cli { margin: 10px 0 2px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); }
details.cli summary { cursor: pointer; padding: 7px 12px; font-size: 0.9rem; font-weight: 600; color: var(--ink-2); }
details.cli[open] summary { border-bottom: 1px solid var(--line); }
details.cli pre { margin: 0; border: 0; border-radius: 0 0 8px 8px; }
details.cli > p, details.cli > ul { padding: 0 14px; font-size: 0.95rem; }

/* pager & done */
.done-row { margin: 40px 0 10px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; font: inherit; font-size: 15px; padding: 9px 16px; border-radius: 9px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.is-done { background: var(--ok-soft); border-color: var(--ok); color: var(--ok); }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 18px; }
.pager a { display: block; padding: 12px 16px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); text-decoration: none; color: var(--ink); font-size: 15px; }
.pager a small { display: block; color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; }
.pager a.next { text-align: right; grid-column: 2; }

/* index */
.hero { padding: 40px 0 10px; }
.chapters { display: grid; gap: 12px; margin: 20px 0; }
.ch-card { display: grid; grid-template-columns: 44px minmax(0,1fr) auto; gap: 14px; align-items: center; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; text-decoration: none; color: var(--ink); }
.ch-card:hover { border-color: var(--accent); }
.ch-card .n { width: 40px; height: 40px; border-radius: 10px; background: var(--accent-soft); color: var(--accent); font-weight: 800; display: grid; place-items: center; }
.ch-card.done .n { background: var(--ok); color: #fff; }
.ch-card .ti { font-weight: 650; line-height: 1.3; }
.ch-card .de { font-size: 14px; color: var(--muted); line-height: 1.4; margin-top: 2px; }
.ch-card .tm { font-size: 13px; color: var(--muted); text-align: right; white-space: nowrap; }
@media (max-width: 560px) { .ch-card { grid-template-columns: 40px minmax(0,1fr); } .ch-card .tm { grid-column: 2; text-align: left; } }
.progress { height: 10px; background: var(--surface-2); border-radius: 99px; overflow: hidden; border: 1px solid var(--line); }
.progress > div { height: 100%; background: var(--ok); width: 0; transition: width .3s; }
.uv-form { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; }
.uv-form label { display: grid; gap: 4px; font-size: 14px; color: var(--ink-2); }
.uv-form input, .uv-form select { font: inherit; font-size: 15px; padding: 7px 10px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); min-width: 160px; }
.uv { background: var(--exam-soft); color: var(--exam); border-radius: 4px; padding: 0 2px; }
pre .uv { background: transparent; color: inherit; font-weight: 700; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; font-size: 0.95rem; }
footer { color: var(--muted); font-size: 14px; padding: 30px 0 50px; border-top: 1px solid var(--line); margin-top: 40px; }

/* task-first lab steps */
.task-label { display: inline-block; font-size: 12px; font-weight: 750; letter-spacing: .07em; text-transform: uppercase; color: var(--lab); margin-bottom: 2px; }
.done-when { background: var(--surface-2); border-radius: 8px; padding: 8px 14px; margin: 10px 0; font-size: 0.95rem; }
.done-when > b { color: var(--lab); font-size: 12px; letter-spacing: .07em; text-transform: uppercase; display: block; }
.done-when ul { margin: 4px 0; padding-left: 20px; }
details.sol { margin: 8px 0 2px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); }
details.sol summary { cursor: pointer; padding: 7px 12px; font-size: 0.9rem; font-weight: 600; color: var(--ink-2); }
details.sol summary::marker { color: var(--muted); }
details.sol[open] summary { border-bottom: 1px solid var(--line); }
details.sol > pre { margin: 0; border: 0; border-radius: 0 0 8px 8px; }
details.sol > :not(pre):not(summary) { margin-left: 14px; margin-right: 14px; font-size: 0.95rem; }
details.sol > ol, details.sol > ul { padding-left: 22px; }
details.hint summary { color: var(--exam); }

/* docs links box */
.callout.docs { border-left-color: var(--accent); background: var(--accent-soft); border-color: transparent; border-left-color: var(--accent); }
.callout.docs .ct { color: var(--accent); }
.callout.docs ul { columns: 2 280px; column-gap: 28px; margin: 6px 0 0; padding-left: 18px; font-size: 0.93rem; }
.callout.docs li { break-inside: avoid; }
a[target="_blank"]::after { content: " ↗"; font-size: 0.8em; color: var(--muted); }

/* syntax highlighting (tokens added by app.js; colours follow the theme tokens) */
pre .t-com { color: var(--muted); font-style: italic; }
pre .t-str { color: var(--ok); }
pre .t-kw, pre .t-op { color: var(--d-purple-s); font-weight: 600; }
pre .t-key { color: var(--accent); }
pre .t-dec { color: var(--exam); }
pre .t-type { color: var(--lab); }
pre .t-fn { color: var(--accent); }
pre .t-num { color: var(--d-red-s); }

/* notes (added by app.js) */
.note-add { font: 600 12px system-ui, sans-serif; color: var(--note); background: transparent; border: 1px dashed color-mix(in srgb, var(--note) 45%, transparent); border-radius: 6px; padding: 2px 8px; cursor: pointer; vertical-align: middle; opacity: .55; transition: opacity .15s; }
h2 > .note-add { margin-left: 10px; position: relative; top: -2px; }
h2:hover > .note-add, .note-add:hover, .note-add:focus-visible { opacity: 1; }
@media (hover: none) { .note-add { opacity: .85; } }
.note-row { margin-top: 10px; }
.note-row:empty { display: none; }
.note-box { background: var(--note-soft); border: 1px solid color-mix(in srgb, var(--note) 30%, transparent); border-left: 4px solid var(--note); border-radius: 8px; padding: 8px 12px 10px; margin: 0.6em 0 1em; }
.note-head { display: flex; align-items: center; gap: 10px; font-size: 12px; margin-bottom: 4px; }
.note-tag { font-weight: 750; letter-spacing: .06em; text-transform: uppercase; color: var(--note); }
.note-stamp { color: var(--muted); flex: 1; }
.note-del { font: inherit; font-size: 12px; background: none; border: 0; color: var(--muted); cursor: pointer; padding: 2px 4px; }
.note-del:hover { color: var(--warn); }
.note-box textarea { width: 100%; resize: vertical; min-height: 3.2em; font: inherit; font-size: 0.95rem; line-height: 1.5; color: var(--ink); background: color-mix(in srgb, var(--surface) 70%, transparent); border: 1px solid color-mix(in srgb, var(--note) 25%, transparent); border-radius: 6px; padding: 6px 9px; }
.note-box textarea:focus { outline: 2px solid color-mix(in srgb, var(--note) 55%, transparent); outline-offset: 0; }
.notes-btn { white-space: nowrap; }
.notes-scrim { position: fixed; inset: 0; background: rgb(0 0 0 / .25); z-index: 30; }
.notes-drawer { position: fixed; top: 0; right: 0; bottom: 0; width: min(400px, 100vw); z-index: 31; background: var(--surface); border-left: 1px solid var(--line); box-shadow: -8px 0 24px rgb(0 0 0 / .12); overflow-y: auto; padding: 14px 18px 30px; font-size: 15px; line-height: 1.5; }
.notes-drawer[hidden], .notes-scrim[hidden] { display: none; }
.nd-head { display: flex; align-items: center; justify-content: space-between; }
.nd-head h3 { margin: 0; font-size: 1.2rem; }
.nd-close { border: 0; background: none; color: var(--muted); font-size: 18px; cursor: pointer; padding: 4px 8px; }
.notes-drawer h4 { font-size: 12px; letter-spacing: .07em; text-transform: uppercase; color: var(--muted); margin: 22px 0 8px; }
.nd-item { display: block; text-decoration: none; color: var(--ink); background: var(--note-soft); border-left: 3px solid var(--note); border-radius: 6px; padding: 7px 10px; margin: 6px 0; }
.nd-item:hover { outline: 1px solid var(--note); }
.nd-item b { display: block; font-size: 13px; color: var(--note); font-weight: 650; }
.nd-item span { display: block; white-space: pre-wrap; word-break: break-word; font-size: 14px; color: var(--ink-2); }
.nd-sum { background: var(--surface-2); border-left-color: var(--line); }
.nd-sum b { color: var(--ink); }
.nd-page { font-weight: 650; font-size: 14px; margin: 14px 0 2px; }
.nd-empty, .nd-small { color: var(--muted); font-size: 14px; }
.nd-data { margin-top: 26px; border-top: 1px solid var(--line); }
.nd-data p { font-size: 14px; color: var(--ink-2); }
.nd-btns { display: flex; gap: 8px; flex-wrap: wrap; }
.nd-btns .btn { font-size: 14px; padding: 7px 12px; }
.nd-msg { color: var(--warn) !important; min-height: 0; margin: 6px 0 0; }
.nd-msg:empty { display: none; }
/* learning-path menu */
.topbar .crumb a { color: inherit; text-decoration: underline; text-decoration-color: var(--line); text-underline-offset: 3px; }
.topbar .crumb a:hover { color: var(--ink); text-decoration-color: currentColor; }
.nav-btn { white-space: nowrap; }
.nav-drawer { position: fixed; top: 0; left: 0; bottom: 0; width: min(360px, 100vw); z-index: 31; background: var(--surface); border-right: 1px solid var(--line); box-shadow: 8px 0 24px rgb(0 0 0 / .12); overflow-y: auto; padding: 14px 14px 30px; font-size: 15px; line-height: 1.4; }
.nav-drawer[hidden] { display: none; }
.nav-drawer a { text-decoration: none; color: var(--ink-2); }
.nv-home { display: block; padding: 8px 10px; margin: 10px 0 6px; border-radius: 8px; font-weight: 600; }
.nv-path { border-top: 1px solid var(--line); padding: 4px 0; }
.nv-path summary { display: flex; gap: 10px; align-items: center; cursor: pointer; padding: 9px 6px; border-radius: 8px; font-weight: 650; color: var(--ink); list-style: none; }
.nv-path summary::-webkit-details-marker { display: none; }
.nv-path summary::after { content: '▸'; color: var(--muted); margin-left: 2px; }
.nv-path[open] summary::after { content: '▾'; }
.nv-path summary:hover, .nv-home:hover, .nv-ov:hover, .nv-item:hover { background: var(--surface-2); }
.nv-n { flex: none; width: 24px; height: 24px; border-radius: 50%; display: grid; place-items: center; font-size: 13px; background: var(--surface-2); border: 1px solid var(--line); }
.nv-path.is-cur .nv-n { background: var(--accent, #2563eb); color: #fff; border-color: transparent; }
.nv-ti { flex: 1; }
.nv-count { font-size: 12px; font-weight: 500; color: var(--muted); }
.nv-count.all { color: var(--ok, #15803d); }
.nv-ov { display: block; padding: 5px 10px 5px 40px; font-size: 14px; border-radius: 8px; }
.nv-item { display: flex; gap: 8px; align-items: baseline; padding: 5px 10px 5px 14px; border-radius: 8px; font-size: 14px; }
.nv-num { flex: none; width: 20px; text-align: right; color: var(--muted); font-variant-numeric: tabular-nums; }
.nv-item.done .nv-num { color: var(--ok, #15803d); }
.nv-t { flex: 1; }
.nv-q { flex: none; font-size: 12px; color: var(--muted); }
.nv-q.pass { color: var(--ok, #15803d); }
.nav-drawer .cur { background: var(--surface-2); color: var(--ink); font-weight: 650; box-shadow: inset 3px 0 0 var(--accent, #2563eb); }
@media (max-width: 560px) { .topbar .crumb { display: none; } .topbar-inner { justify-content: space-between; } .nav-btn span { display: none; } }
@media print { .nav-btn, .nav-drawer, .note-add, .notes-btn, .notes-drawer, .notes-scrim, .note-del { display: none !important; } }

/* cloud sync panel */
.nd-cloud h4 { color: var(--accent); }
.nd-unlock { display: grid; gap: 8px; margin-top: 4px; }
.nd-unlock[hidden] { display: none; }
.nd-unlock label { display: grid; gap: 4px; font-size: 13px; color: var(--ink-2); }
.nd-unlock input { font: 13px ui-monospace, "SF Mono", Menlo, monospace; padding: 7px 9px; border-radius: 7px; border: 1px solid var(--line); background: var(--surface-2); color: var(--ink); width: 100%; }
.nd-check { display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--ink-2); margin-top: 10px; cursor: pointer; }
.nd-check input { accent-color: var(--accent); width: 16px; height: 16px; }
.nd-status { font-size: 14px; color: var(--ok) !important; background: var(--ok-soft); border-radius: 6px; padding: 6px 10px; }
.nd-status.is-err { color: var(--warn) !important; background: var(--warn-soft); }
.nd-btns .btn:disabled { opacity: .5; cursor: progress; }
.notes-btn.sync-err { border-color: var(--warn); color: var(--warn); }
.nd-cloud [hidden] { display: none !important; }

/* ---------- learning-path picker and AZ-305 design modules ---------- */
.paths { display: grid; gap: 14px; margin: 20px 0; }
.path-card { display: grid; grid-template-columns: 52px minmax(0,1fr); gap: 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; text-decoration: none; color: var(--ink); }
a.path-card:hover { border-color: var(--accent); }
.path-card .n { width: 48px; height: 48px; border-radius: 12px; background: var(--az305-soft); color: var(--az305); font-weight: 800; font-size: 1.2rem; display: grid; place-items: center; }
.path-card.done .n { background: var(--ok); color: #fff; }
.path-card .ti { font-weight: 700; font-size: 1.08rem; line-height: 1.3; }
.path-card .de { font-size: 14.5px; color: var(--ink-2); margin: 4px 0 8px; line-height: 1.45; }
.path-card .progress { height: 7px; margin-top: 4px; }
.path-card .pc-prog, .path-card .pc-meta { font-size: 13px; color: var(--muted); margin-top: 5px; }
.path-card.soon { opacity: .6; }
.path-card.soon .n { background: var(--surface-2); color: var(--muted); }
.tag-soon { display: inline-block; font-size: 11px; font-weight: 750; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); border: 1px solid var(--line); border-radius: 99px; padding: 1px 8px; margin-left: 8px; vertical-align: 2px; }
.ch-card .n.v { background: var(--az305-soft); color: var(--az305); }
.ch-card.soon { opacity: .6; pointer-events: none; }

/* "in one sentence" + key-idea blocks */
.gist { border-radius: var(--radius); background: var(--az305-soft); padding: 12px 16px; margin: 1em 0; font-size: 1.04rem; }
.gist b.k { display: block; font-size: 12px; letter-spacing: .07em; text-transform: uppercase; color: var(--az305); margin-bottom: 2px; }
.unit-head { display: flex; flex-wrap: wrap; gap: 6px 10px; align-items: center; font-size: 13px; color: var(--muted); margin: -0.3em 0 0.6em; }
.unit-head .badge { font-size: 12.5px; padding: 1px 9px; }
.know-decide { display: grid; gap: 12px; grid-template-columns: 1fr; margin: 1em 0; }
@media (min-width: 720px) { .know-decide { grid-template-columns: 1fr 1fr; } }
.kd { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; }
.kd > b { display: block; font-size: 12px; letter-spacing: .07em; text-transform: uppercase; margin-bottom: 2px; }
.kd.know > b { color: var(--accent); } .kd.decide > b { color: var(--lab); }
.kd ul { padding-left: 18px; margin: 4px 0; }
.kd li { font-size: 0.96rem; }

/* level strip: where in the hierarchy a unit lives */
.lvl { display: flex; flex-wrap: wrap; gap: 4px; align-items: center; margin: 0.4em 0 1em; font-size: 12.5px; }
.lvl span { padding: 3px 9px; border-radius: 6px; background: var(--surface-2); color: var(--muted); border: 1px solid var(--line); }
.lvl span.on { background: var(--az305); color: #fff; border-color: var(--az305); font-weight: 650; }
.lvl i { color: var(--muted); font-style: normal; }

/* recall prompts and memory hooks */
.recall { border: 1px dashed var(--az305); border-radius: var(--radius); padding: 10px 14px; margin: 1.2em 0; }
.recall > b { display: block; font-size: 12px; letter-spacing: .07em; text-transform: uppercase; color: var(--az305); margin-bottom: 4px; }
.recall details { margin: 6px 0; }
.recall summary { cursor: pointer; font-weight: 600; }
.recall details > :not(summary) { margin-left: 18px; color: var(--ink-2); }
.hook { display: flex; gap: 10px; align-items: flex-start; background: var(--note-soft); border-radius: 8px; padding: 9px 13px; margin: 1em 0; font-size: 0.97rem; }
.hook::before { content: "💡"; }

/* case study (version B) */
.ask { display: grid; grid-template-columns: 40px minmax(0,1fr); gap: 12px; background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--exam); border-radius: 8px; padding: 12px 14px; margin: 1em 0; }
.ask .who { width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; background: var(--exam-soft); color: var(--exam); font-weight: 800; font-size: 14px; }
.ask p { margin: 0.2em 0; }
.ask .role { font-size: 13px; color: var(--muted); }
.adr { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); margin: 1.2em 0; overflow: hidden; }
.adr > b { display: block; background: var(--lab-soft); color: var(--lab); font-size: 12px; letter-spacing: .07em; text-transform: uppercase; padding: 6px 14px; }
.adr dl { display: grid; grid-template-columns: max-content minmax(0,1fr); gap: 4px 14px; margin: 0; padding: 10px 14px; font-size: 0.95rem; }
.adr dt { font-weight: 650; color: var(--ink-2); }
.adr dd { margin: 0; }
@media (max-width: 560px) { .adr dl { grid-template-columns: 1fr; } .adr dd { margin-bottom: 6px; } }

/* flashcards (version C) */
.fc-deck { margin: 1.2em 0; }
.fc-head { display: flex; justify-content: space-between; gap: 10px; font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.fc { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 20px; min-height: 120px; }
.fc[hidden] { display: none; }
.fc-q { font-weight: 650; font-size: 1.08rem; }
.fc-a { display: none; margin-top: 12px; padding-top: 12px; border-top: 1px dashed var(--line); color: var(--ink-2); }
.fc.flipped .fc-a { display: block; }
.fc-btns { margin-top: 10px; }
.fc-again { border-color: var(--warn); color: var(--warn); }
.fc-good { border-color: var(--lab); color: var(--lab); }
.fc-easy { border-color: var(--ok); color: var(--ok); }
.fc-empty { color: var(--ink-2); }
.cheat { columns: 2 300px; column-gap: 24px; }
.cheat > div { break-inside: avoid; background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; margin: 0 0 12px; font-size: 0.93rem; }
.cheat > div > b { display: block; color: var(--az305); }
.cheat ul { padding-left: 18px; margin: 4px 0; }
.primer { background: var(--surface-2); border-radius: var(--radius); padding: 10px 16px; }
.deeper { margin: 8px 0 2px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); }
.deeper summary { cursor: pointer; padding: 7px 12px; font-size: 0.92rem; font-weight: 600; color: var(--accent); }
.deeper[open] summary { border-bottom: 1px solid var(--line); }
.deeper > :not(summary) { margin-left: 14px; margin-right: 14px; }
.big3 { counter-reset: k; list-style: none; padding: 0; }
.big3 > li { counter-increment: k; position: relative; padding: 2px 0 2px 38px; margin: 10px 0; }
.big3 > li::before { content: counter(k); position: absolute; left: 0; top: 0; width: 26px; height: 26px; border-radius: 50%; background: var(--az305-soft); color: var(--az305); font-weight: 800; font-size: 13px; display: grid; place-items: center; }
@media print { .fc-deck, .topbar, .toc, .pager, .done-row { display: none !important; } }

/* quiz score bar (app.js) */
.quiz-score { position: sticky; bottom: 10px; z-index: 5; display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: center; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 14px; margin: 10px 0 24px; box-shadow: 0 4px 14px rgb(0 0 0 / .08); font-size: 15px; }
.quiz-score b { color: var(--accent); }
.quiz-score span { color: var(--ink-2); }
.quiz-score .qs-best { color: var(--muted); font-size: 13px; }
.quiz-score .btn { margin-left: auto; padding: 5px 12px; font-size: 14px; }
.qbest { color: var(--ok); font-weight: 600; }