/* ===== Python Academy styles ===== */
:root {
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", "Cascadia Code", "Fira Code", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --radius: 12px;
  --side-w: 300px;
  --top-h: 60px;
}
[data-theme="dark"] {
  --bg: #0d1117; --bg2: #11161f; --card: #161b26; --card2: #1c2331; --border: #283041;
  --text: #e6e9ef; --muted: #98a2b3; --accent: #60a5fa; --accent2: #facc15; --accent-ink: #0b1220;
  --ok: #34d399; --ok-bg: rgba(52,211,153,.12); --bad: #f87171; --bad-bg: rgba(248,113,113,.12);
  --warn-bg: rgba(250,204,21,.10); --note-bg: rgba(96,165,250,.10); --sys-bg: rgba(167,139,250,.12); --sys: #a78bfa;
  --code-bg: #0b0f17; --code-text: #e6e9ef; --inline-code: #1f2737;
  --tok-kw: #c792ea; --tok-str: #a5e075; --tok-num: #f78c6c; --tok-com: #6b7a90; --tok-def: #82aaff; --tok-builtin: #ffcb6b; --tok-op: #89ddff;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.25);
  color-scheme: dark;
}
[data-theme="light"] {
  --bg: #f7f8fb; --bg2: #ffffff; --card: #ffffff; --card2: #f2f4f8; --border: #e2e6ee;
  --text: #1a2233; --muted: #5d6879; --accent: #2563eb; --accent2: #b45309; --accent-ink: #ffffff;
  --ok: #059669; --ok-bg: rgba(5,150,105,.09); --bad: #dc2626; --bad-bg: rgba(220,38,38,.08);
  --warn-bg: #fff8e1; --note-bg: #eef4ff; --sys-bg: #f3efff; --sys: #7c3aed;
  --code-bg: #f6f8fa; --code-text: #1f2328; --inline-code: #eef1f6;
  --tok-kw: #8250df; --tok-str: #0a7a3e; --tok-num: #b35900; --tok-com: #6e7781; --tok-def: #0550ae; --tok-builtin: #953800; --tok-op: #0550ae;
  --shadow: 0 1px 2px rgba(16,24,40,.06), 0 6px 18px rgba(16,24,40,.06);
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-padding-top: calc(var(--top-h) + 16px); }
body { margin: 0; font-family: var(--font); background: var(--bg); color: var(--text); font-size: 16.5px; line-height: 1.65; -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code, kbd, pre { font-family: var(--mono); font-size: .9em; }
:not(pre) > code { background: var(--inline-code); padding: .1em .38em; border-radius: 6px; font-size: .86em; }
kbd { border: 1px solid var(--border); border-bottom-width: 2px; border-radius: 5px; padding: 0 .35em; font-size: .8em; background: var(--card2); }
h1, h2, h3 { line-height: 1.25; letter-spacing: -.01em; }
h1 { font-size: 2.1rem; margin: .2em 0 .3em; }
h2 { font-size: 1.45rem; margin: 2em 0 .6em; }
h3 { font-size: 1.12rem; margin: 1.4em 0 .4em; }
.muted { color: var(--muted); }
.small { font-size: .88rem; }
.grow { flex: 1; }
.skip-link { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--accent-ink); padding: 8px 12px; border-radius: 8px; z-index: 100; }
.skip-link:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ----- Top bar ----- */
.topbar { position: sticky; top: 0; z-index: 30; height: var(--top-h); display: flex; align-items: center; gap: 14px; padding: 0 18px;
  background: color-mix(in srgb, var(--bg2) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--border); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.08rem; color: var(--text); white-space: nowrap; }
.brand:hover { text-decoration: none; }
.brand-logo { font-size: 1.4rem; }
.search-wrap { position: relative; flex: 1; max-width: 520px; margin-left: 12px; }
#searchInput { width: 100%; padding: 9px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); color: var(--text); font: inherit; font-size: .95rem; }
.search-results { position: absolute; top: calc(100% + 6px); left: 0; right: 0; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); max-height: 70vh; overflow: auto; padding: 6px; }
.sr-item, .sr-all { display: block; padding: 8px 10px; border-radius: 8px; color: var(--text); }
.sr-item:hover, .sr-item.sel { background: var(--card2); text-decoration: none; }
.sr-item .snip { display: block; color: var(--muted); font-size: .84rem; line-height: 1.45; margin-top: 2px; }
.sr-all { color: var(--accent); font-size: .9rem; border-top: 1px solid var(--border); margin-top: 4px; }
.sr-empty { padding: 12px; color: var(--muted); }
mark { background: color-mix(in srgb, var(--accent2) 35%, transparent); color: inherit; border-radius: 3px; padding: 0 1px; }
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.py-status { font-size: .8rem; color: var(--muted); border: 1px solid var(--border); border-radius: 999px; padding: 3px 10px; white-space: nowrap; }
.py-status[data-state="ready"] { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); }
.py-status[data-state="loading"], .py-status[data-state="running"] { color: var(--accent2); }
.py-status[data-state="error"] { color: var(--bad); }
.icon-btn { background: var(--card); border: 1px solid var(--border); color: var(--text); border-radius: 10px; width: 38px; height: 38px; font-size: 1.1rem; cursor: pointer; }
.icon-btn:hover { background: var(--card2); }
.menu-btn { display: none; }

/* ----- Layout ----- */
.layout { display: flex; min-height: calc(100vh - var(--top-h)); }
.sidebar { width: var(--side-w); flex-shrink: 0; position: sticky; top: var(--top-h); height: calc(100vh - var(--top-h)); overflow-y: auto;
  border-right: 1px solid var(--border); background: var(--bg2); padding: 14px 12px 40px; font-size: .92rem; }
.content { flex: 1; min-width: 0; padding: 28px clamp(18px, 4vw, 56px) 80px; max-width: 980px; outline: none; }
.side-links a { display: block; padding: 6px 10px; border-radius: 8px; color: var(--text); }
.side-links a:hover, .side-level a:hover { background: var(--card2); text-decoration: none; }
.side-links a[aria-current="page"] { background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent); font-weight: 600; }
.side-overall { margin: 12px 10px 8px; font-size: .82rem; color: var(--muted); }
.side-overall-top { display: flex; justify-content: space-between; margin-bottom: 4px; }
.side-level { margin-top: 6px; border-top: 1px solid var(--border); padding-top: 6px; }
.side-level summary { cursor: pointer; display: flex; justify-content: space-between; padding: 6px 10px; font-weight: 600; border-radius: 8px; list-style: none; }
.side-level summary::-webkit-details-marker { display: none; }
.side-level summary::before { content: "▸"; margin-right: 6px; color: var(--muted); transition: transform .15s; display: inline-block; }
.side-level[open] summary::before { transform: rotate(90deg); }
.side-level summary span:first-child { flex: 1; }
.side-count { color: var(--muted); font-weight: 400; font-size: .8rem; }
.side-level > .pbar { margin: 0 10px 6px; height: 4px; }
.side-level ol { list-style: none; margin: 0; padding: 0 0 6px; }
.side-level a { display: flex; gap: 6px; padding: 4px 10px; border-radius: 7px; color: var(--muted); line-height: 1.4; }
.side-level a[aria-current="page"] { background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent); font-weight: 600; }
.tick { width: 14px; flex-shrink: 0; color: var(--ok); font-weight: 700; }
.scrim { position: fixed; inset: var(--top-h) 0 0 0; background: rgba(0,0,0,.45); z-index: 19; }

/* ----- Cards, buttons, bars ----- */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.btn { display: inline-flex; align-items: center; gap: 6px; font: inherit; font-size: .9rem; font-weight: 600; padding: 7px 14px; border-radius: 9px;
  border: 1px solid var(--border); background: var(--card2); color: var(--text); cursor: pointer; text-decoration: none; transition: filter .12s, transform .05s; }
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .6; cursor: progress; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.ghost { background: transparent; }
.btn.danger { background: transparent; border-color: var(--bad); color: var(--bad); }
.btn.big { padding: 11px 20px; font-size: 1rem; }
.btn.tiny { padding: 3px 10px; font-size: .8rem; }
.btn.is-done { background: var(--ok-bg); border-color: var(--ok); color: var(--ok); }
.badge { display: inline-block; font-size: .74rem; font-weight: 600; padding: 2px 8px; border-radius: 999px; background: var(--card2); border: 1px solid var(--border); color: var(--muted); white-space: nowrap; }
.badge.run { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); background: var(--ok-bg); }
.badge.local { color: var(--accent2); border-color: color-mix(in srgb, var(--accent2) 40%, transparent); background: var(--warn-bg); }
.pbar { height: 8px; background: var(--card2); border-radius: 999px; overflow: hidden; border: 1px solid var(--border); }
.pbar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), #22d3ee); border-radius: 999px; transition: width .4s; }

/* ----- Home ----- */
.hero { padding: 26px 0 10px; }
.eyebrow { text-transform: uppercase; letter-spacing: .1em; font-size: .78rem; color: var(--accent); font-weight: 700; margin: 0; }
.hero h1 { font-size: clamp(1.8rem, 3.6vw, 2.6rem); max-width: 22ch; }
.lead { font-size: 1.1rem; color: var(--muted); max-width: 68ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.dash { display: grid; grid-template-columns: 1.4fr 1fr; gap: 18px; margin-top: 28px; }
.dash .card { padding: 20px 22px; }
.dash h2 { margin: 0 0 8px; font-size: 1.15rem; }
.big-pct { font-size: 3rem; font-weight: 800; line-height: 1; margin: 6px 0 12px; }
.big-pct small { font-size: 1.3rem; color: var(--muted); }
.lvl-rows { margin-top: 14px; display: grid; gap: 8px; }
.lvl-row { display: grid; grid-template-columns: 150px 1fr 56px; gap: 12px; align-items: center; color: var(--text); font-size: .92rem; padding: 3px 4px; border-radius: 8px; }
.lvl-row:hover { background: var(--card2); text-decoration: none; }
.lvl-num { text-align: right; color: var(--muted); font-variant-numeric: tabular-nums; }
.howto { padding-left: 18px; margin: 0; font-size: .93rem; }
.howto li { margin: 6px 0; }
.section-title { margin-top: 2.2em; }
.level-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; }
.level-card { padding: 18px 20px; color: var(--text); display: flex; flex-direction: column; transition: transform .12s, border-color .12s; }
.level-card:hover { transform: translateY(-2px); border-color: var(--accent); text-decoration: none; }
.level-card h3 { margin: 6px 0 4px; }
.level-card p { margin: 0 0 10px; font-size: .92rem; color: var(--muted); }
.level-card .pbar { margin-top: auto; }
.lc-icon { font-size: 1.8rem; }

/* ----- Level page ----- */
.crumbs { font-size: .86rem; color: var(--muted); }
.level-head { display: flex; align-items: center; gap: 14px; max-width: 520px; }
.level-head .pbar { flex: 1; }
.lesson-list { list-style: none; padding: 0; display: grid; gap: 10px; margin-top: 22px; }
.lesson-list a { display: flex; align-items: center; gap: 14px; padding: 12px 16px; color: var(--text); }
.lesson-list a:hover { text-decoration: none; background: var(--card2); border-radius: var(--radius); }
.ll-num { width: 32px; height: 32px; border-radius: 50%; background: var(--card2); display: grid; place-items: center; font-weight: 700; flex-shrink: 0; border: 1px solid var(--border); }
.ll-body { flex: 1; display: flex; flex-direction: column; }
.ll-body .muted { font-size: .9rem; }
.ll-min { color: var(--muted); font-size: .85rem; white-space: nowrap; }

/* ----- Lesson ----- */
.lesson-head .meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; color: var(--muted); font-size: .9rem; }
.lesson-head .meta .act-done { margin-left: auto; }
.lesson-body p, .lesson-body li { max-width: 72ch; }
.lesson-body ul, .lesson-body ol { padding-left: 1.3em; }
.callout { border-radius: var(--radius); padding: 12px 16px; margin: 18px 0; border: 1px solid var(--border); border-left-width: 4px; }
.callout p { margin: 4px 0 0; }
.callout-title { font-weight: 700; font-size: .9rem; }
.callout.tip { background: var(--ok-bg); border-left-color: var(--ok); }
.callout.warn { background: var(--warn-bg); border-left-color: var(--accent2); }
.callout.note { background: var(--note-bg); border-left-color: var(--accent); }
.callout.sysadmin { background: var(--sys-bg); border-left-color: var(--sys); }
.table-wrap { overflow-x: auto; margin: 16px 0; }
table { border-collapse: collapse; width: 100%; font-size: .92rem; }
th, td { border-bottom: 1px solid var(--border); padding: 7px 10px; text-align: left; vertical-align: top; }
th { background: var(--card2); font-weight: 600; }

.codeblock, .shell { margin: 20px 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--code-bg); }
.cb-head, .shell figcaption { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 7px 12px; background: var(--card2); border-bottom: 1px solid var(--border); font-size: .84rem; font-weight: 600; }
.local-why { padding: 9px 14px; font-size: .88rem; background: var(--warn-bg); border-bottom: 1px solid var(--border); }
.shell pre { margin: 0; padding: 12px 16px; overflow-x: auto; color: var(--code-text); line-height: 1.5; }
.cb-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 8px 12px; border-top: 1px solid var(--border); background: var(--card); }
.hint { color: var(--muted); font-size: .78rem; margin-left: auto; }
.stdin-row { padding: 8px 12px; border-top: 1px solid var(--border); background: var(--card); font-size: .8rem; color: var(--muted); }
.stdin-row label { display: block; }
.stdin { display: block; width: 100%; margin-top: 4px; font-family: var(--mono); font-size: .86rem; background: var(--code-bg); color: var(--code-text); border: 1px solid var(--border); border-radius: 8px; padding: 6px 8px; resize: vertical; }
.output { margin: 0; padding: 12px 16px; border-top: 1px dashed var(--border); background: var(--bg); white-space: pre-wrap; word-break: break-word; max-height: 420px; overflow: auto; font-size: .86rem; line-height: 1.5; }
.output .err { color: var(--accent2); }
.output .exc { color: var(--bad); }
.output .run-meta { display: block; margin-top: 8px; color: var(--muted); font-size: .75rem; font-family: var(--font); }

/* Editor */
.editor-host .CodeMirror { height: auto; font-family: var(--mono); font-size: .88rem; line-height: 1.55; background: var(--code-bg); color: var(--code-text); padding: 6px 0; }
.editor-host .CodeMirror-gutters { background: var(--code-bg); border-right: 1px solid var(--border); }
.editor-host .CodeMirror-linenumber { color: var(--muted); opacity: .6; }
.editor-host .CodeMirror-cursor { border-left-color: var(--text); }
.editor-host .CodeMirror-selected, .editor-host .CodeMirror-focused .CodeMirror-selected { background: color-mix(in srgb, var(--accent) 25%, transparent); }
.editor-host .CodeMirror-activeline-background { background: var(--card2); }
.cm-s-default .cm-keyword { color: var(--tok-kw); }
.cm-s-default .cm-string, .cm-s-default .cm-string-2 { color: var(--tok-str); }
.cm-s-default .cm-number { color: var(--tok-num); }
.cm-s-default .cm-comment { color: var(--tok-com); font-style: italic; }
.cm-s-default .cm-def { color: var(--tok-def); }
.cm-s-default .cm-builtin { color: var(--tok-builtin); }
.cm-s-default .cm-variable { color: var(--code-text); }
.cm-s-default .cm-variable-2 { color: var(--tok-def); }
.cm-s-default .cm-property { color: var(--code-text); }
.cm-s-default .cm-operator { color: var(--tok-op); }
.cm-s-default .cm-meta { color: var(--tok-builtin); }
.cm-s-default .cm-atom { color: var(--tok-num); }
.cm-s-default .cm-error { color: var(--bad); background: none; }
.CodeMirror-matchingbracket { color: var(--ok) !important; }
.code-fallback { display: block; width: 100%; min-height: 80px; border: 0; resize: vertical; padding: 10px 14px; font-family: var(--mono); font-size: .88rem; line-height: 1.55; background: var(--code-bg); color: var(--code-text); tab-size: 4; white-space: pre; overflow-x: auto; }

/* Exercises */
.exercise { padding: 16px 18px; margin: 18px 0; }
.exercise .codeblock, .exercise .editor-host { border-radius: 10px; }
.exercise .editor-host { border: 1px solid var(--border); overflow: hidden; margin-top: 10px; }
.exercise .cb-tools, .exercise .stdin-row { background: transparent; border: 0; padding: 10px 0 0; }
.exercise .output { border: 1px solid var(--border); border-radius: 10px; margin-top: 10px; }
.ex-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.ex-head h3 { margin: 0; }
.ex-status { font-size: .8rem; font-weight: 600; color: var(--muted); border: 1px solid var(--border); padding: 2px 10px; border-radius: 999px; }
.ex-status.passed { color: var(--ok); border-color: var(--ok); background: var(--ok-bg); }
.ex-status.failed { color: var(--bad); border-color: var(--bad); background: var(--bad-bg); }
.exercise.is-pass { border-color: var(--ok); }
.exercise.is-fail { border-color: color-mix(in srgb, var(--bad) 60%, var(--border)); }
.ex-prompt p { margin: .4em 0; }
.test-results { list-style: none; padding: 0; margin: 10px 0 0; display: grid; gap: 6px; }
.test-results li { display: flex; gap: 10px; padding: 7px 12px; border-radius: 8px; font-size: .9rem; }
.test-results li.pass { background: var(--ok-bg); }
.test-results li.fail { background: var(--bad-bg); }
.test-results .ti { font-weight: 800; }
.test-results li.pass .ti { color: var(--ok); }
.test-results li.fail .ti { color: var(--bad); }
.test-results .msg { font-family: var(--mono); font-size: .8rem; color: var(--muted); white-space: pre-wrap; }
.solution { margin-top: 12px; font-size: .9rem; }
.solution summary { cursor: pointer; color: var(--muted); }
.solution pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; overflow-x: auto; }

/* Quiz */
.quiz { padding: 8px 20px 18px; }
.q { border: 0; border-bottom: 1px solid var(--border); padding: 14px 0; margin: 0; }
.q legend { font-weight: 600; padding: 0; margin-bottom: 8px; float: left; width: 100%; }
.q legend + * { clear: both; }
.qn { color: var(--accent); }
.opt { display: flex; align-items: flex-start; gap: 10px; padding: 7px 10px; border-radius: 8px; cursor: pointer; border: 1px solid transparent; }
.opt:hover { background: var(--card2); }
.opt input { margin-top: 5px; accent-color: var(--accent); }
.opt.correct { border-color: var(--ok); background: var(--ok-bg); }
.opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.explain { margin-top: 8px; padding: 8px 12px; border-radius: 8px; background: var(--card2); font-size: .92rem; }
.q.is-right .explain strong { color: var(--ok); }
.q.is-wrong .explain strong { color: var(--bad); }
.quiz-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 14px; }
.quiz-score { font-weight: 600; }

.lesson-done { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 20px; margin-top: 36px; flex-wrap: wrap; }
.lesson-done p { margin: 2px 0 0; }
.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 18px; }
.pager a { display: flex; flex-direction: column; padding: 14px 18px; color: var(--text); }
.pager a:hover { border-color: var(--accent); text-decoration: none; }
.pager-next { text-align: right; }

/* Progress page */
.prog-summary { display: flex; gap: 24px; align-items: center; padding: 20px 24px; flex-wrap: wrap; }
.prog-summary .btn { margin-top: 6px; }
.prog-level { padding: 16px 20px; margin-top: 18px; }
.prog-level h2 { margin: 0; font-size: 1.15rem; }
.prog-level-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; color: var(--muted); }
.prog-table { margin-top: 12px; }
.prog-table td:first-child, .prog-table th:first-child { width: 60px; text-align: center; }

/* Cheat sheet & glossary */
.cheat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(380px, 1fr)); gap: 16px; }
.cheat { padding: 14px 18px; overflow: hidden; }
.cheat h2 { margin: 0 0 8px; font-size: 1.05rem; }
.cheat pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; overflow-x: auto; font-size: .82rem; line-height: 1.5; margin: 0; }
.cheat table code { background: none; padding: 0; }
.glossary-filter, .search-page-form input { width: 100%; max-width: 420px; padding: 9px 14px; border-radius: 10px; border: 1px solid var(--border); background: var(--card); color: var(--text); font: inherit; }
.search-page-form { display: flex; gap: 8px; }
.glossary { display: grid; gap: 10px; margin-top: 18px; }
.g-item { padding: 12px 16px; }
.g-item dt { font-weight: 700; font-family: var(--mono); color: var(--accent); }
.g-item dd { margin: 4px 0 0; }
.g-item.flash { animation: flash 2s; }
@keyframes flash { 0%, 40% { border-color: var(--accent2); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent2) 40%, transparent); } }
.search-list { list-style: none; padding: 0; display: grid; gap: 10px; }
.search-list a { display: block; padding: 12px 16px; color: var(--text); }
.search-list a:hover { text-decoration: none; background: var(--card2); border-radius: var(--radius); }
.search-list .snip { display: block; color: var(--muted); font-size: .9rem; margin-top: 4px; }

.toast { position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%) translateY(30px); opacity: 0; background: var(--text); color: var(--bg); padding: 9px 18px; border-radius: 999px; font-weight: 600; font-size: .9rem; transition: all .25s; z-index: 50; pointer-events: none; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ----- Responsive ----- */
@media (max-width: 960px) {
  .menu-btn { display: inline-block; }
  .sidebar { position: fixed; left: 0; top: var(--top-h); z-index: 20; transform: translateX(-105%); transition: transform .2s; box-shadow: var(--shadow); }
  body.menu-open .sidebar { transform: none; }
  .dash { grid-template-columns: 1fr; }
  .py-status { display: none; }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .brand span:last-child { display: none; }
  .search-wrap { margin-left: 0; }
  .content { padding: 18px 14px 60px; }
  h1 { font-size: 1.7rem; }
  .lvl-row { grid-template-columns: 110px 1fr 44px; }
  .pager { grid-template-columns: 1fr; }
  .cheat-grid { grid-template-columns: 1fr; }
  .lesson-head .meta .act-done { margin-left: 0; }
  .hint { display: none; }
}
@media print {
  .topbar, .sidebar, .cb-tools, .pager, .lesson-done { display: none; }
  .content { max-width: none; }
}

/* ===================== Linux track additions ===================== */
:root { --term-bg: #0a0e14; --term-text: #d6deeb; --term-dim: #7f8a9e; --term-prompt: #7ee787; --term-path: #79c0ff; }
[data-theme="light"] { --term-bg: #0f1724; --term-text: #e2e8f0; --term-dim: #94a3b8; --term-prompt: #86efac; --term-path: #93c5fd; }

/* Tracks on the dashboard + sidebar */
.tracks { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 18px; margin-top: 24px; }
.track-card { padding: 20px 22px; display: flex; flex-direction: column; gap: 6px; border-top: 4px solid var(--accent); }
.track-card[data-track="linux"] { border-top-color: var(--ok); }
.track-top { display: flex; align-items: flex-start; gap: 14px; }
.track-top > div:nth-child(2) { flex: 1; }
.track-top h2 { margin: 0 0 4px; font-size: 1.25rem; }
.track-top p { margin: 0; }
.track-icon { font-size: 2.2rem; line-height: 1; }
.track-pct .big-pct { margin: 0; font-size: 2.4rem; }
.track-card .hero-actions { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 8px; }
.track-card .lvl-rows { margin-top: 4px; }
.side-track { margin: 14px 10px 4px; padding-top: 10px; border-top: 2px solid var(--border); font-size: .82rem; color: var(--muted); }
.side-track-head { display: flex; justify-content: space-between; font-weight: 700; color: var(--text); margin-bottom: 4px; text-transform: uppercase; letter-spacing: .04em; font-size: .78rem; }
.prog-tracks { display: grid; gap: 8px; min-width: 260px; flex: 1; }
.prog-track { display: grid; grid-template-columns: 110px 1fr 64px; gap: 10px; align-items: center; font-size: .9rem; }
.prog-track .lvl-num { text-align: right; color: var(--muted); }
.link-like { color: var(--accent); font-weight: 600; }
.wg-card { color: var(--text); }
.wg-card:hover { text-decoration: none; border-color: var(--accent); }

/* Tabs (cheat sheets) */
.tabs { display: flex; gap: 6px; margin: 14px 0 6px; border-bottom: 1px solid var(--border); }
.tab { padding: 8px 14px; border: 1px solid transparent; border-bottom: 0; border-radius: 10px 10px 0 0; color: var(--muted); font-weight: 600; }
.tab:hover { text-decoration: none; color: var(--text); background: var(--card2); }
.tab.active { color: var(--text); background: var(--card); border-color: var(--border); margin-bottom: -1px; }

/* Callouts + badges */
.callout.ps { background: color-mix(in srgb, #3b82f6 9%, transparent); border-left-color: #3b82f6; }
.callout.ps table { margin-top: 8px; }
.badge.sim { color: #fbbf24; border-color: rgba(251,191,36,.45); background: rgba(251,191,36,.12); }
figure.shell.is-real { border-color: color-mix(in srgb, var(--accent2) 45%, var(--border)); }
.shell .real-why, .is-real .local-why { padding: 8px 14px; font-size: .88rem; background: var(--warn-bg); border-bottom: 1px solid var(--border); }
.sample-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding: 6px 14px; font-size: .8rem; font-weight: 600; color: var(--muted); background: var(--card2); border-top: 1px dashed var(--border); }
pre.sample { opacity: .9; font-style: normal; border-left: 3px dashed var(--border); }

/* Terminal */
figure.term-block { margin: 18px 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--card); }
.term-note { padding: 8px 14px; font-size: .88rem; color: var(--muted); border-bottom: 1px solid var(--border); }
.term-host { margin-top: 10px; }
figure.term-block .term-host { margin-top: 0; }
.term { background: var(--term-bg); color: var(--term-text); border-radius: 10px; overflow: hidden; border: 1px solid #1f2937; font-family: var(--mono); font-size: .86rem; }
figure.term-block .term { border-radius: 0; border: 0; }
.term-head { display: flex; align-items: center; gap: 10px; padding: 7px 10px; background: #151b26; border-bottom: 1px solid #1f2937; font-family: var(--font); font-size: .8rem; color: #9aa4b2; }
.term-dots { display: inline-flex; gap: 5px; }
.term-dots i { width: 10px; height: 10px; border-radius: 50%; background: #ef4444; display: inline-block; }
.term-dots i:nth-child(2) { background: #f59e0b; } .term-dots i:nth-child(3) { background: #22c55e; }
.term-title { flex: 1; font-family: var(--mono); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.term-head .btn { color: #cbd5e1; border-color: #334155; }
.term-head .btn:hover { background: #1e293b; }
.term-screen { padding: 10px 12px; max-height: 420px; min-height: 140px; overflow-y: auto; cursor: text; line-height: 1.45; }
.term-out { white-space: pre-wrap; word-break: break-word; }
.term-chunk { white-space: pre-wrap; display: inline; }
.term-chunk.term-cmd { color: #f1f5f9; }
.term-chunk.term-err, .term-err { color: #fca5a5; }
.term-chunk.term-sys { color: var(--term-dim); font-style: italic; }
.term-line { display: flex; align-items: baseline; gap: 0; }
.term-prompt { white-space: pre; color: var(--term-prompt); font-weight: 600; }
.term-prompt .p-path, .term-prompt b { color: var(--term-path); }
.term-input { flex: 1; min-width: 40px; background: transparent; border: 0; outline: none; color: var(--term-text); font: inherit; padding: 0; caret-color: var(--term-prompt); }
.term-input:focus-visible { outline: none; }
.term-screen:focus-within { box-shadow: inset 0 0 0 1px rgba(126,231,135,.25); }
.term-demo { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; padding: 8px 10px; background: #111723; border-top: 1px solid #1f2937; }
.term-demo .muted { color: #94a3b8; font-family: var(--font); }
.chip { font-family: var(--mono); font-size: .78rem; padding: 3px 9px; border-radius: 999px; border: 1px solid #334155; background: #172033; color: #dbeafe; cursor: pointer; max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chip:hover { border-color: var(--term-prompt); color: #fff; }
.chip:focus-visible { outline: 2px solid var(--term-prompt); outline-offset: 1px; }
/* ANSI colours */
.a-b { font-weight: 700; } .a-d { opacity: .65; }
.a-k { color: #64748b; } .a-r { color: #f87171; } .a-g { color: #4ade80; } .a-y { color: #facc15; }
.a-m { color: #e879f9; } .a-c { color: #22d3ee; } .a-w { color: #e5e7eb; }
.a-K { color: #94a3b8; } .a-R { color: #fca5a5; } .a-G { color: #86efac; } .a-Y { color: #fde047; } .a-B { color: #93c5fd; } .a-M { color: #f0abfc; } .a-C { color: #67e8f9; } .a-W { color: #ffffff; }

/* Linux exercises */
.exercise.lx-ex .term-host { margin-top: 12px; }

/* Wargame */
.wg-summary { display: flex; gap: 24px; align-items: center; padding: 18px 22px; margin: 18px 0; flex-wrap: wrap; }
.wg-summary .grow { flex: 1; min-width: 220px; }
.wg-ladder { list-style: none; padding: 0; display: grid; gap: 10px; margin-top: 18px; }
.wg-item a { display: flex; align-items: center; gap: 14px; padding: 12px 16px; color: var(--text); }
.wg-item a:hover { text-decoration: none; background: var(--card2); border-radius: var(--radius); }
.wg-item.solved { border-color: color-mix(in srgb, var(--ok) 50%, var(--border)); }
.wg-item.solved .ll-num { background: var(--ok-bg); color: var(--ok); border-color: var(--ok); }
.wg-item.locked { opacity: .62; }
.wg-item .ll-min code { font-size: .74rem; }
.wg-goal, .wg-locked { padding: 14px 18px; margin: 16px 0; }
.wg-goal h2, .wg-locked h2, .wg-hints h2 { margin: 0 0 6px; font-size: 1.1rem; }
.wg-term { margin: 16px 0; }
.flag-form { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; padding: 14px 18px; margin: 16px 0; }
.flag-input { flex: 1; min-width: 220px; font-family: var(--mono); font-size: .95rem; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg2); color: var(--text); }
.flag-input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.flag-msg { font-weight: 600; font-size: .92rem; }
.flag-msg.ok { color: var(--ok); } .flag-msg.bad { color: var(--bad); }
.hint-box { padding: 10px 16px; margin: 8px 0; }
.hint-box summary { cursor: pointer; font-weight: 600; }
.hint-box.spoiler summary { color: var(--bad); }
.hint-box pre { background: var(--code-bg); padding: 10px 12px; border-radius: 8px; overflow-x: auto; }
.wg-dots { display: flex; flex-wrap: wrap; gap: 8px; }
.wg-dot { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; border: 1px solid var(--border); background: var(--card2); color: var(--muted); font-weight: 700; font-size: .85rem; }
.wg-dot:hover { text-decoration: none; border-color: var(--accent); }
.wg-dot.solved { background: var(--ok-bg); border-color: var(--ok); color: var(--ok); }

@media (max-width: 640px) {
  .tracks { grid-template-columns: 1fr; }
  .track-top { flex-wrap: wrap; }
  .track-pct .big-pct { font-size: 2rem; }
  .term { font-size: .8rem; }
  .term-screen { max-height: 340px; padding: 8px; }
  .term-head .term-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; min-width: 0; }
  .prog-track { grid-template-columns: 90px 1fr 54px; }
  .flag-form .btn { width: 100%; }
  .tabs { overflow-x: auto; }
}

/* ===== IT Academy: Azure & CCNA tracks ===== */
.track-card[data-track="azure"] { border-top-color: #0ea5e9; }
.track-card[data-track="ccna"] { border-top-color: #14b8a6; }
.track-card.soon, .side-track.soon { opacity: .7; }
.track-card.soon { border-top-style: dashed; }
.callout.tryreal { background: color-mix(in srgb, #10b981 8%, transparent); border-left-color: #10b981; }
.callout.tryreal ol, .callout.tryreal ul { margin: 6px 0 4px; padding-left: 1.3em; }
.callout.tryreal pre { margin: 8px 0 0; }
.callout.exam { background: color-mix(in srgb, #f59e0b 9%, transparent); border-left-color: #f59e0b; }
.callout.meraki { background: color-mix(in srgb, #22c55e 9%, transparent); border-left-color: #22c55e; }
.callout.security { background: color-mix(in srgb, #ef4444 8%, transparent); border-left-color: #ef4444; }
.term-tabs { display: flex; flex-wrap: wrap; gap: 4px; padding: 6px 8px; background: #111722; border-bottom: 1px solid #1f2937; font-family: var(--font); }
.term-tab { font: inherit; font-size: .78rem; color: #9aa4b2; background: transparent; border: 1px solid #334155; border-radius: 6px; padding: 3px 9px; cursor: pointer; }
.term-tab:hover { background: #1e293b; color: #e2e8f0; }
.term-tab[aria-selected="true"] { background: #1e3a5f; color: #fff; border-color: #3b82f6; }
.trainer-block { margin: 20px 0; padding: 0; overflow: hidden; }
.trainer-block .cb-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 10px 14px; border-bottom: 1px solid var(--border); background: var(--card2); flex-wrap: wrap; }
.trainer-block .cb-title { font-weight: 700; }
.trainer-block .subnet-trainer { padding: 12px 14px; }
.subnet-trainer .st-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 10px; }
.subnet-trainer select, .subnet-trainer input, .sc-pair select { font: inherit; padding: 6px 9px; border-radius: 8px; border: 1px solid var(--border); background: var(--card); color: var(--text); }
.subnet-trainer .st-q p { font-size: 1.02rem; margin: 6px 0 10px; }
.subnet-trainer .st-form { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; }
.subnet-trainer .st-field { display: flex; flex-direction: column; gap: 4px; font-size: .88rem; position: relative; }
.subnet-trainer .st-field input { font-family: var(--mono); }
.subnet-trainer .st-field.ok input { border-color: var(--ok); background: var(--ok-bg); }
.subnet-trainer .st-field.bad input { border-color: var(--bad); background: var(--bad-bg); }
.subnet-trainer .st-mark { position: absolute; right: 10px; bottom: 7px; font-weight: 700; }
.subnet-trainer .st-field.ok .st-mark { color: var(--ok); } .subnet-trainer .st-field.bad .st-mark { color: var(--bad); }
.subnet-trainer .st-actions { grid-column: 1 / -1; display: flex; gap: 8px; flex-wrap: wrap; }
.subnet-trainer .st-fb { margin-top: 10px; }
.st-ok { color: var(--ok); } .st-bad { color: var(--bad); }
.st-results { margin-top: 10px; }
.sc-box { margin: 10px 0; }
.sc-opts { display: flex; flex-direction: column; gap: 6px; }
.sc-order { list-style: decimal; padding-left: 1.6em; margin: 6px 0; }
.sc-item { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 6px 10px; margin: 4px 0; border: 1px solid var(--border); border-radius: 8px; background: var(--card2); }
.sc-move { display: flex; gap: 4px; flex-shrink: 0; }
.sc-match { display: flex; flex-direction: column; gap: 8px; }
.sc-pair { display: grid; grid-template-columns: 1fr minmax(180px, 280px); gap: 10px; align-items: center; padding: 6px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--card2); }
.sc-fb { margin-top: 8px; }
@media (max-width: 640px) {
  .sc-pair { grid-template-columns: 1fr; }
  .subnet-trainer .st-form { grid-template-columns: 1fr; }
  .term-tabs { overflow-x: auto; flex-wrap: nowrap; }
}