/* PDK Radio Trainer. No external fonts or assets: everything works offline. */

:root {
  --bg: #0d1620;
  --panel: #132130;
  --panel-2: #1a2b3d;
  --line: #27394c;
  --text: #e6edf3;
  --muted: #93a4b5;
  --accent: #46b9e6;
  --accent-ink: #062030;
  --ok: #3ecf8e;
  --warn: #f0b84a;
  --fail: #ef5b5b;
  --tip: #79aef7;
  --lcd: #a6ff7a;
  --lcd-bg: #07110a;
  --tx: #ff4040;
  --radius: 10px;
  --mono: ui-monospace, "Cascadia Mono", "Consolas", "Roboto Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color-scheme: dark;
}

[data-theme="light"] {
  --bg: #f3f6f9;
  --panel: #ffffff;
  --panel-2: #eef3f7;
  --line: #d4dde6;
  --text: #13202c;
  --muted: #5b6b7a;
  --accent: #0b7fb3;
  --accent-ink: #ffffff;
  --ok: #138a55;
  --warn: #a8690a;
  --fail: #c62f2f;
  --tip: #2e6fc7;
  --lcd: #a6ff7a;
  --lcd-bg: #0b1a10;
  color-scheme: light;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 var(--sans);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--accent); }
h2 { font-size: 1.25rem; margin: 0 0 .5rem; }
h3 { font-size: 1.05rem; margin: 1.2rem 0 .5rem; }
p { margin: .4rem 0; }
.muted { color: var(--muted); }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; z-index: 10; background: var(--panel); padding: 6px 10px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ---- header and footer */
.top {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: .6rem 1.2rem; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(6px); border-bottom: 1px solid var(--line);
}
.brand { color: var(--text); text-decoration: none; font-weight: 700; letter-spacing: .02em; display: flex; align-items: center; gap: .55rem; }
.brand-mark { width: 14px; height: 14px; border-radius: 50%; background: var(--lcd); box-shadow: 0 0 10px var(--lcd); }
nav { display: flex; gap: .3rem; }
nav a { color: var(--muted); text-decoration: none; padding: .35rem .7rem; border-radius: 6px; }
nav a.on, nav a:hover { color: var(--text); background: var(--panel-2); }
.banner { background: color-mix(in srgb, var(--warn) 22%, var(--panel)); border-bottom: 1px solid var(--warn); padding: .5rem 1.2rem; }
main { flex: 1; width: 100%; max-width: 1560px; margin: 0 auto; padding: 1rem 1.2rem 2rem; }
main:focus { outline: none; }
.foot { border-top: 1px solid var(--line); padding: .8rem 1.2rem; color: var(--muted); font-size: .85rem; text-align: center; }

/* ---- buttons and fields */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
  font: inherit; color: var(--text); background: var(--panel-2); border: 1px solid var(--line);
  border-radius: 8px; padding: .5rem .9rem; cursor: pointer; text-decoration: none; min-height: 40px;
}
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.btn.ghost { background: transparent; }
.btn.danger { border-color: var(--fail); color: var(--fail); background: transparent; }
.btn.big { width: 100%; min-height: 52px; font-size: 1.05rem; margin: .6rem 0; }
.link { background: none; border: 0; color: var(--accent); cursor: pointer; padding: 0 .3rem; font: inherit; font-size: .85rem; }
.row { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .8rem; }
input[type="text"], input[type="number"], select {
  font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line);
  border-radius: 8px; padding: .45rem .6rem; min-height: 40px;
}
input[type="number"] { width: 6rem; }
.field { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem; margin: .6rem 0; }
.field-msg { color: var(--muted); font-size: .9rem; }
.field-msg.bad { color: var(--fail); }
.check { display: flex; gap: .4rem; align-items: flex-start; margin: .45rem 0; }
fieldset { border: 1px solid var(--line); border-radius: var(--radius); margin: .8rem 0; padding: .5rem .8rem; }
legend { color: var(--muted); padding: 0 .3rem; }

/* ---- home */
.intro { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.2rem; margin-bottom: 1rem; }
.howto { margin: .5rem 0 0; padding-left: 1.2rem; color: var(--muted); }
.levels { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: .8rem; }
.level-card { display: grid; grid-template-columns: 3rem 1fr auto; gap: .8rem; align-items: start; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: .9rem; }
.level-card.suggested { border-color: var(--accent); }
.level-card.off { opacity: .55; grid-template-columns: 3rem 1fr; }
.level-card h3 { margin: 0 0 .3rem; display: flex; gap: .4rem; align-items: center; flex-wrap: wrap; }
.level-card p { font-size: .92rem; }
.lvl-n { font: 700 1.6rem/1 var(--mono); color: var(--lcd); background: var(--lcd-bg); border-radius: 8px; text-align: center; padding: .55rem 0; }
.tag { font-size: .72rem; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; background: var(--accent); color: var(--accent-ink); border-radius: 4px; padding: .1rem .4rem; }
.tag.ok { background: var(--ok); color: #04150c; }

/* ---- three-panel runner */
.runner { display: grid; grid-template-columns: minmax(270px, 1fr) minmax(360px, 1.25fr) minmax(300px, 1.1fr); gap: 1rem; align-items: start; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem; min-width: 0; }
.panel.radio { position: sticky; top: 4.2rem; }
.goal { color: var(--muted); font-size: .93rem; }
.situation { display: grid; grid-template-columns: auto 1fr; gap: .2rem .8rem; margin: .8rem 0; }
.situation dt { color: var(--muted); }
.situation dd { margin: 0; font-weight: 600; }
.atis-controls { display: flex; flex-wrap: wrap; gap: .4rem; }
.atis-text { background: var(--panel-2); border-radius: 8px; padding: .6rem .8rem; font-size: .92rem; }
.hint-box { margin: .8rem 0; }
.hint-box summary { cursor: pointer; color: var(--muted); }
.hint { background: var(--panel-2); border-radius: 8px; padding: .5rem .7rem; }
.seed { color: var(--muted); font-size: .75rem; }

/* radio stack */
.radio-stack {
  display: grid; grid-template-columns: auto auto 1fr; align-items: baseline; gap: .8rem;
  background: var(--lcd-bg); border: 1px solid #1f3a26; border-radius: 8px; padding: .6rem .9rem; margin-bottom: .8rem;
}
.com-label { color: #6c9a70; font: 600 .8rem var(--mono); }
.com-freq { color: var(--lcd); font: 700 2rem/1 var(--mono); letter-spacing: .06em; text-shadow: 0 0 8px rgba(166, 255, 122, .45); }
.com-name { color: #8fd48a; font: .85rem var(--mono); text-align: right; }

.transcript { list-style: none; margin: 0; padding: 0; max-height: 42vh; overflow-y: auto; display: flex; flex-direction: column; gap: .35rem; }
.transcript li { padding: .4rem .6rem; border-radius: 8px; background: var(--panel-2); border-left: 3px solid transparent; }
.transcript li.atc { border-left-color: var(--accent); }
.transcript li.me { border-left-color: var(--ok); }
.transcript li.sys { background: transparent; color: var(--muted); font-style: italic; padding: .2rem .6rem; }
.transcript .who { font: 600 .75rem var(--mono); text-transform: uppercase; color: var(--muted); margin-right: .5rem; }
.prompt { margin: .8rem 0 .2rem; min-height: 1.5em; }
.choices { display: flex; flex-direction: column; gap: .4rem; margin: .4rem 0; }

/* push to talk */
.transmit { margin-top: .6rem; }
.transmit.waiting .ptt { opacity: .9; }
.ptt {
  width: 100%; min-height: 76px; border-radius: 14px; border: 2px solid var(--line);
  background: linear-gradient(180deg, var(--panel-2), var(--panel)); color: var(--text);
  font: 700 1.1rem var(--sans); letter-spacing: .04em; cursor: pointer; touch-action: none; user-select: none; -webkit-user-select: none;
  display: flex; align-items: center; justify-content: center; gap: .8rem;
}
.ptt:disabled { cursor: not-allowed; opacity: .5; }
.ptt-light { width: 16px; height: 16px; border-radius: 50%; background: #3a4652; box-shadow: inset 0 0 3px #000; }
.ptt-key { font: .75rem var(--mono); color: var(--muted); border: 1px solid var(--line); border-radius: 4px; padding: .1rem .4rem; }
.ptt.starting { border-color: var(--warn); }
.ptt.starting .ptt-light { background: var(--warn); }
.ptt.tx { border-color: var(--tx); background: color-mix(in srgb, var(--tx) 18%, var(--panel)); }
.ptt.tx .ptt-light { background: var(--tx); box-shadow: 0 0 14px var(--tx); }
.tx-live { min-height: 1.4em; color: var(--muted); font-style: italic; margin: .4rem 0; }
.type-row { display: flex; gap: .5rem; }
.type-row input { flex: 1; min-width: 0; }
.silent-row { margin-top: .4rem; }
.tx-status { color: var(--warn); font-size: .9rem; min-height: 1.2em; margin-top: .3rem; }

/* debrief */
.debrief-card, .summary-card { background: var(--panel-2); border: 1px solid var(--line); border-radius: 8px; padding: .7rem .8rem; margin: .6rem 0; }
.debrief-card.excluded { opacity: .5; }
.debrief-card.miss { border-color: color-mix(in srgb, var(--fail) 55%, var(--line)); }
.summary-card { border-color: var(--accent); }
.summary-card h3 { margin-top: 0; }
.debrief-card header { display: flex; justify-content: space-between; align-items: center; gap: .5rem; margin-bottom: .3rem; }
.debrief-card .step { font-weight: 600; font-size: .92rem; }
.debrief-card dl { display: grid; grid-template-columns: auto 1fr; gap: .15rem .7rem; margin: .3rem 0; font-size: .92rem; }
.debrief-card dt { color: var(--muted); }
.debrief-card dd { margin: 0; overflow-wrap: anywhere; }
.debrief-card .ideal { color: var(--ok); }
.debrief-card .alts { color: var(--muted); font-size: .85rem; }
.badge { font: 700 .85rem var(--mono); border-radius: 6px; padding: .1rem .5rem; min-width: 3rem; text-align: center; }
.badge.ok { background: color-mix(in srgb, var(--ok) 25%, transparent); color: var(--ok); }
.badge.warn { background: color-mix(in srgb, var(--warn) 25%, transparent); color: var(--warn); }
.badge.fail { background: color-mix(in srgb, var(--fail) 25%, transparent); color: var(--fail); }
.findings { list-style: none; margin: .3rem 0; padding: 0; font-size: .9rem; display: flex; flex-direction: column; gap: .25rem; }
.findings .sev { font: 700 .7rem var(--mono); text-transform: uppercase; border-radius: 4px; padding: .05rem .35rem; }
.sev-critical .sev { background: var(--fail); color: #fff; }
.sev-major .sev { background: var(--warn); color: #241600; }
.sev-minor .sev { background: color-mix(in srgb, var(--warn) 35%, var(--panel)); color: var(--text); }
.sev-tip .sev { background: color-mix(in srgb, var(--tip) 30%, var(--panel)); color: var(--text); }
.sev-good .sev { background: color-mix(in srgb, var(--ok) 30%, var(--panel)); color: var(--text); }
.findings .src { color: var(--muted); font-size: .8rem; }
.clean { color: var(--ok); font-size: .9rem; }
.explain { font-size: .88rem; color: var(--muted); }
.misheard { display: flex; gap: .4rem; align-items: center; font-size: .85rem; color: var(--muted); margin-top: .4rem; }
.retries summary { cursor: pointer; color: var(--muted); font-size: .85rem; }

/* drills and ATIS */
.counter { color: var(--muted); font: .9rem var(--mono); }
.drill-card { background: var(--lcd-bg); border-radius: 10px; padding: 1rem; text-align: center; margin-bottom: .6rem; }
.drill-label { color: #8fd48a; font: .9rem var(--mono); text-transform: uppercase; letter-spacing: .05em; }
.drill-value { color: var(--lcd); font: 700 2.4rem/1.2 var(--mono); margin: .4rem 0; }
.drill-card .muted { color: #7f9a84; }
.q-list { padding-left: 1.4rem; margin: 0 0 .6rem; }
.q-row { padding: .4rem .5rem; border-radius: 8px; cursor: pointer; display: flex; flex-direction: column; border: 1px solid transparent; }
.q-row.active { border-color: var(--accent); background: var(--panel-2); }
.q-row .answer { font-family: var(--mono); color: var(--lcd); min-height: 1.3em; }

/* diagram */
.diagram-wrap { margin: .8rem 0 0; }
.diagram { width: 100%; max-height: 460px; background: var(--panel-2); border-radius: 8px; }
.diagram .twy { fill: none; stroke: color-mix(in srgb, var(--muted) 45%, transparent); stroke-width: 45; stroke-linecap: round; stroke-linejoin: round; }
.diagram .twy-A, .diagram .twy-B, .diagram .twy-E, .diagram .twy-G { stroke: color-mix(in srgb, var(--muted) 75%, transparent); }
.diagram .rwy { stroke: #5f6f80; stroke-linecap: butt; }
[data-theme="light"] .diagram .rwy { stroke: #4b5967; }
.diagram .rwy-label { fill: var(--text); font: 700 150px var(--mono); }
.diagram .twy-label { fill: var(--muted); font: 600 120px var(--sans); }
.diagram .twy-label.main { fill: var(--text); font-size: 150px; }
.diagram .ramp-label { fill: var(--muted); font: 120px var(--sans); }
.diagram .hold { fill: var(--warn); }
.diagram .hold.dep { fill: var(--ok); }
.diagram .hotspot { fill: none; stroke: #d98b2b; stroke-width: 22; stroke-dasharray: 60 40; }
.diagram .hs-label { fill: #d98b2b; font: 700 115px var(--sans); }
.diagram .route { fill: none; stroke: var(--accent); stroke-width: 70; stroke-linecap: round; stroke-linejoin: round; opacity: .85; }
.diagram .me { fill: var(--lcd); stroke: #000; stroke-width: 18; }
.diagram-wrap figcaption { color: var(--muted); font-size: .78rem; margin-top: .3rem; }

/* pages */
.page { max-width: 900px; }
.page section { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: .4rem 1rem 1rem; margin: .8rem 0; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; }
th, td { text-align: left; padding: .4rem .5rem; border-bottom: 1px solid var(--line); }
th { color: var(--muted); font-weight: 600; }
tr.crit td { color: var(--fail); }
.review, .weak, .sources { padding-left: 1.2rem; }
.review li { margin-bottom: .6rem; }
.error { color: var(--fail); }

/* disclaimer dialog */
dialog.disclaimer { max-width: 520px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); color: var(--text); padding: 1.2rem 1.4rem; }
dialog.disclaimer::backdrop { background: rgba(0, 0, 0, .6); }

/* phone: one column */
@media (max-width: 1050px) {
  .runner { grid-template-columns: 1fr; }
  .panel.radio { position: static; order: 1; }
  .panel.scenario { order: 2; }
  .panel.debrief { order: 3; }
  .diagram { max-height: 340px; }
  .transcript { max-height: none; }
  main { padding: .7rem; }
  .top { padding: .5rem .7rem; }
  .brand { font-size: .95rem; }
}
@media (max-width: 520px) {
  nav a { padding: .3rem .45rem; font-size: .9rem; }
  .levels { grid-template-columns: 1fr; }
  .com-freq { font-size: 1.6rem; }
  .ptt-key { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}

/* ================================================================ Learn track */

.crumb { color: var(--muted); font-size: .88rem; margin: 0 0 .6rem; }
.crumb a { color: var(--muted); }
.btn.small { min-height: 32px; padding: .25rem .6rem; font-size: .88rem; }
.tag.soft { background: color-mix(in srgb, var(--ok) 25%, var(--panel)); color: var(--text); }

/* path home */
.path .intro-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; flex-wrap: wrap; }
.path .next-btn { width: auto; padding: .6rem 1.2rem; }
.stats { display: flex; gap: .8rem; margin: .8rem 0 .4rem; flex-wrap: wrap; }
.stat { background: var(--panel-2); border-radius: 10px; padding: .45rem .9rem; display: flex; align-items: baseline; gap: .4rem; }
.stat-n { font: 700 1.4rem var(--mono); color: var(--accent); }
.stat-k { color: var(--muted); font-size: .88rem; }
.badge-row { list-style: none; padding: 0; margin: .5rem 0; display: flex; flex-wrap: wrap; gap: .45rem; }
.badge-chip { border: 1px dashed var(--line); border-radius: 10px; padding: .3rem .6rem; font-size: .8rem; color: var(--muted); display: flex; flex-direction: column; max-width: 220px; }
.badge-chip strong { color: var(--muted); font-size: .85rem; }
.badge-chip.earned { border-style: solid; border-color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, var(--panel)); color: var(--text); }
.badge-chip.earned strong { color: var(--ok); }
.howto-box summary, .later summary { cursor: pointer; color: var(--muted); margin-top: .6rem; }
.steps { list-style: none; padding: 0; margin: 1rem 0; display: flex; flex-direction: column; gap: .6rem; }
.step { display: grid; grid-template-columns: 52px 1fr auto; gap: .9rem; align-items: center; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: .75rem .9rem; }
.step.next { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.step.practise { margin-left: 1.6rem; }
.step h3 { margin: 0 0 .2rem; display: flex; gap: .4rem; align-items: center; flex-wrap: wrap; font-size: 1rem; }
.step p { margin: .15rem 0; font-size: .92rem; }
.step-kind { font: 600 .75rem var(--mono); text-transform: uppercase; letter-spacing: .05em; color: var(--accent); }
.step .lvl-n { font-size: 1.2rem; padding: .7rem 0; }
.later { margin: 1rem 0; color: var(--muted); }

/* progress ring */
.ring { display: block; }
.ring-bg { fill: none; stroke: var(--panel-2); stroke-width: 5; }
.ring-fg { fill: none; stroke: var(--accent); stroke-width: 5; stroke-linecap: round; }
.passed .ring-fg { stroke: var(--ok); }
.ring-t { fill: var(--text); font: 700 10px var(--mono); }

/* unit page */
.unit-head { display: flex; gap: 1rem; align-items: center; margin-bottom: .6rem; }
.lesson-list { list-style: none; padding: 0; margin: 1rem 0; display: flex; flex-direction: column; gap: .35rem; }
.lesson-list li { display: flex; align-items: center; gap: .7rem; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: .55rem .75rem; }
.lesson-list .tick { font: 700 .75rem var(--mono); min-width: 3rem; text-align: center; border-radius: 6px; padding: .2rem .3rem; background: var(--panel-2); color: var(--muted); }
.lesson-list .done .tick { background: color-mix(in srgb, var(--ok) 25%, transparent); color: var(--ok); }
.lesson-list .checkpoint { border-style: dashed; }
.ready-note { color: var(--ok); }
.learn-link { font-size: .9rem; }

/* lesson player */
.lesson-player { max-width: 820px; margin: 0 auto; }
.lp-head { margin-bottom: .6rem; }
.lp-row { display: flex; align-items: center; gap: .6rem; }
.lp-bar { flex: 1; height: 8px; border-radius: 4px; background: var(--panel-2); overflow: hidden; }
.lp-fill { display: block; height: 100%; width: 0; background: var(--accent); transition: width .25s; }
.lp-count { font: .8rem var(--mono); white-space: nowrap; }
.lp-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.2rem; min-height: 260px; }
.lp-card h2 { font-size: 1.3rem; }
.lp-card p { font-size: 1.04rem; }
.lp-list { padding-left: 1.2rem; }
.lp-list li { margin: .3rem 0; }
.src-line, .lp-card .src { color: var(--muted); font-size: .78rem; }
.lp-foot { display: flex; justify-content: flex-end; gap: .5rem; margin-top: .7rem; flex-wrap: wrap; }
.q { font-weight: 600; font-size: 1.08rem; }
.opts { display: grid; grid-template-columns: 1fr; gap: .45rem; margin: .6rem 0; }
.opt { font: inherit; text-align: left; color: var(--text); background: var(--panel-2); border: 1px solid var(--line); border-radius: 8px; padding: .65rem .8rem; cursor: pointer; min-height: 44px; }
.opt:hover:not(:disabled) { border-color: var(--accent); }
.opt.sel, .seg.sel, .bucket.sel { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.opt.right, .seg.right, .bucket.right { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 16%, var(--panel-2)); }
.opt.wrong, .seg.wrong, .bucket.wrong { border-color: var(--fail); background: color-mix(in srgb, var(--fail) 16%, var(--panel-2)); }
.opt:disabled, .seg:disabled, .bucket:disabled, .chip:disabled { cursor: default; opacity: 1; }
.fb { border-radius: 8px; padding: .6rem .8rem; margin: .7rem 0; border: 1px solid; }
.fb.ok { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, var(--panel)); }
.fb.no { border-color: var(--warn); background: color-mix(in srgb, var(--warn) 12%, var(--panel)); }
.listen-box { display: flex; align-items: center; gap: .5rem; margin: .4rem 0; flex-wrap: wrap; }
.btn.play::before { content: ""; display: inline-block; width: 0; height: 0; border-left: 9px solid currentColor; border-top: 6px solid transparent; border-bottom: 6px solid transparent; }

/* spot the mistake */
.segs { line-height: 2.4; }
.seg { font: inherit; color: var(--text); background: var(--panel-2); border: 1px solid var(--line); border-radius: 6px; padding: .2rem .5rem; cursor: pointer; }

/* build a call */
.built { min-height: 52px; border: 2px dashed var(--line); border-radius: 10px; padding: .45rem; display: flex; flex-wrap: wrap; gap: .35rem; align-items: center; margin: .4rem 0; }
.pool { display: flex; flex-wrap: wrap; gap: .4rem; margin: .5rem 0; }
.chip { font: inherit; color: var(--text); background: var(--panel-2); border: 1px solid var(--line); border-radius: 999px; padding: .4rem .8rem; cursor: pointer; min-height: 40px; }
.chip.placed { background: color-mix(in srgb, var(--accent) 22%, var(--panel-2)); border-color: var(--accent); }
.answer-line { display: block; margin-top: .3rem; }

/* sort */
.sort { display: flex; flex-direction: column; gap: .5rem; margin: .6rem 0; }
.sort-row { display: grid; grid-template-columns: 1fr auto; gap: .6rem; align-items: center; background: var(--panel-2); border-radius: 8px; padding: .5rem .6rem; }
.buckets { display: flex; gap: .3rem; flex-wrap: wrap; justify-content: flex-end; }
.bucket { font: inherit; font-size: .88rem; color: var(--text); background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: .35rem .55rem; cursor: pointer; min-height: 36px; }

/* map targets */
.target { cursor: pointer; }
.target-hit { fill: transparent; }
.target-dot { fill: color-mix(in srgb, var(--accent) 35%, transparent); stroke: var(--accent); stroke-width: 22; }
.target:hover .target-dot, .target:focus .target-dot { fill: color-mix(in srgb, var(--accent) 60%, transparent); }
.target.picked .target-dot { fill: var(--accent); }
.target.right .target-dot { fill: var(--ok); stroke: var(--ok); }
.target.wrong .target-dot { fill: var(--fail); stroke: var(--fail); }

/* radio and tuning */
.com-box { display: flex; align-items: center; gap: .8rem; background: var(--lcd-bg); border: 1px solid #1f3a26; border-radius: 10px; padding: .7rem 1rem; flex-wrap: wrap; }
.com-slot { display: flex; flex-direction: column; }
.com-tag { font: 600 .7rem var(--mono); color: #6c9a70; letter-spacing: .08em; }
.com-num { font: 700 1.8rem/1.1 var(--mono); color: var(--lcd); }
.com-slot.stby .com-num { color: #6fb85a; font-size: 1.4rem; }
.com-swap { font: .8rem var(--mono); color: #8fd48a; border: 1px solid #2f5a36; border-radius: 6px; padding: .15rem .4rem; }
.tune .type-row { margin-top: .6rem; flex-wrap: wrap; }
.tune-in { flex: 1; min-width: 8rem; }

/* sprint */
.sprint-top { display: flex; justify-content: space-between; font: .9rem var(--mono); }
.timer { color: var(--accent); }
.sprint-prompt { text-align: center; margin: 1rem 0; min-height: 90px; display: flex; align-items: center; justify-content: center; }
.big-letter { font: 700 4.5rem/1 var(--mono); color: var(--lcd); background: var(--lcd-bg); border-radius: 14px; padding: .6rem 1.6rem; }
.sprint-opts { grid-template-columns: 1fr 1fr; }
.sprint-end h2 { font: 700 2.4rem var(--mono); color: var(--accent); }

/* ATIS copy and say steps */
.copy-form { display: grid; gap: .5rem; margin: .7rem 0; }
.copy-row { display: grid; grid-template-columns: 8rem 1fr auto; gap: .6rem; align-items: center; }
.copy-row input.right { border-color: var(--ok); }
.copy-row input.wrong { border-color: var(--fail); }
.copy-ans { font-size: .88rem; grid-column: 2 / 4; }
.copy-ans.ok { color: var(--ok); }
.copy-ans.no { color: var(--warn); }
.atc-line { background: var(--panel-2); border-left: 3px solid var(--accent); border-radius: 8px; padding: .55rem .7rem; margin: .5rem 0; }
.atc-line .who { font: 600 .75rem var(--mono); text-transform: uppercase; color: var(--muted); }
.example { color: var(--ok); font-style: italic; }
.say-out { margin-top: .5rem; }
.alts { color: var(--muted); font-size: .85rem; }

/* end of lesson */
.lesson-end { text-align: center; padding: 1rem 0; }
.xp-gain { font: 700 2rem var(--mono); color: var(--accent); margin: .3rem 0; }
.lesson-end .badge-row { justify-content: center; }
.misses { text-align: left; }
.misses li { margin: .4rem 0; }

/* figures */
.fig { margin: .8rem 0; }
.fig-svg { width: 100%; max-width: 520px; display: block; margin: 0 auto; }
.fig-cap { color: var(--muted); font-size: .82rem; text-align: center; }
.fig-svg .ground { fill: #4a5d3a; }
.fig-svg .class-b { fill: color-mix(in srgb, #3c6fd9 30%, transparent); stroke: #3c6fd9; stroke-width: 2; }
.fig-svg .class-d { fill: color-mix(in srgb, #3c6fd9 18%, transparent); stroke: #3c6fd9; stroke-width: 2; stroke-dasharray: 6 4; }
.fig-svg .rwy-mark { fill: #222; }
.fig-svg .fig-label { fill: var(--text); font: 700 14px var(--sans); }
.fig-svg .fig-small { fill: var(--text); font: 11px var(--sans); }
.fig-svg .fig-ground { fill: #e6edf3; font: 700 11px var(--sans); }
.fig-svg .taxiway { fill: #5d6670; }
.fig-svg .runway { fill: #2e3338; }
.fig-svg .fig-rwy { fill: #e6edf3; font: 700 16px var(--mono); letter-spacing: .3em; }
.fig-svg .solid { stroke: #f5c400; stroke-width: 4; }
.fig-svg .dash { stroke: #f5c400; stroke-width: 4; stroke-dasharray: 10 7; }
.fig-svg .sign { fill: #c62828; }
.fig-svg .sign-t { fill: #fff; font: 700 13px var(--mono); }
.fig-svg .arrow { stroke: var(--accent); stroke-width: 4; fill: none; }
.anatomy { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: .5rem; }
.anatomy .part { border-radius: 10px; padding: .6rem .7rem; display: flex; flex-direction: column; gap: .2rem; border: 1px solid var(--line); }
.anatomy .p1 { background: color-mix(in srgb, #3c6fd9 18%, var(--panel)); }
.anatomy .p2 { background: color-mix(in srgb, #2fa36b 18%, var(--panel)); }
.anatomy .p3 { background: color-mix(in srgb, #d18b2b 18%, var(--panel)); }
.anatomy .p4 { background: color-mix(in srgb, #a84fc2 18%, var(--panel)); }
.part-k { font: 600 .78rem var(--mono); color: var(--muted); }
.part-v { font-weight: 600; }
.alpha-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: .35rem; }
.alpha-cell { font: inherit; color: var(--text); background: var(--panel-2); border: 1px solid var(--line); border-radius: 8px; padding: .35rem; cursor: pointer; display: flex; flex-direction: column; align-items: center; }
.alpha-l { font: 700 1.2rem var(--mono); color: var(--lcd); }
.alpha-w { font-size: .85rem; }
.atis-card table { margin: 0 auto; border-collapse: collapse; font-family: var(--mono); }
.atis-card th, .atis-card td { border: 1px solid var(--line); padding: .3rem .6rem; }
.radio-fig .com-box { justify-content: center; }

/* glossary */
.gl-search { width: 100%; margin: .5rem 0 .8rem; font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: .5rem .7rem; }
.glossary dt { font-weight: 700; margin-top: .7rem; }
.glossary dd { margin: .1rem 0 0; }
.glossary .src { color: var(--muted); font-size: .78rem; }
dialog.gl-dialog { width: min(640px, 94vw); max-height: 86vh; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); color: var(--text); padding: 1rem 1.2rem; }
dialog.gl-dialog::backdrop { background: rgba(0, 0, 0, .55); }
.gl-head { display: flex; justify-content: space-between; align-items: center; }
.gl-scroll { max-height: 60vh; overflow-y: auto; }

/* cheat card */
.cheat-card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.3rem; }
.cheat-card section { margin-bottom: .6rem; }
.cheat-card h3 { margin: .6rem 0 .2rem; color: var(--accent); }
.cheat-card ul { margin: 0; padding-left: 1.2rem; }
.cheat-foot { color: var(--muted); font-size: .8rem; margin-top: 1rem; }

@media (max-width: 640px) {
  .step { grid-template-columns: 44px 1fr; }
  .step > .btn { grid-column: 1 / 3; }
  .step.practise { margin-left: .6rem; }
  .sort-row { grid-template-columns: 1fr; }
  .buckets { justify-content: flex-start; }
  .copy-row { grid-template-columns: 1fr; }
  .copy-ans { grid-column: 1; }
  .lp-card { padding: .9rem; }
  .big-letter { font-size: 3.4rem; }
}

@media print {
  .top, .banner, .no-print, .foot, nav, .skip { display: none !important; }
  body { background: #fff; color: #000; }
  main { padding: 0; max-width: none; }
  .cheat-card { border: 1px solid #000; background: #fff; color: #000; }
  .cheat-card h3 { color: #000; }
  .cheat-foot { color: #333; }
}

.lp-card .quiz-map .diagram { max-height: 620px; }
@media (max-width: 480px) {
  .brand-text { display: none; }
  nav a { font-size: .88rem; padding: .3rem .4rem; }
}
@media (max-width: 640px) {
  .badge-chip:not(.earned) span { display: none; }
  .badge-chip { max-width: none; }
}
.must-know { display: inline-block; font: 600 .78rem var(--mono); color: var(--warn); border: 1px solid var(--warn); border-radius: 6px; padding: .1rem .45rem; margin: 0 0 .3rem; }