/* IFR Oral Trainer — sibling of the CFI Chart Room theme.
   Paper: chart cream. Accent: IFR en-route blue, with approach-plate amber for drills. */
:root {
  --paper: #f5f0e4; --paper-2: #efe8d8; --paper-3: #e7ddc8;
  --ink: #22262e; --ink-soft: #4b5261; --ink-faint: #7d828f;
  --accent: #1f5a85; --accent-deep: #163f5e;
  --amber: #b5781f; --amber-soft: #f3e3c4;
  --ok: #3e6b4f; --shaky: #b5781f; --miss: #a13c2f;
  --line: #d8ccb2; --card: #fbf8f1;
  --shadow: 0 1px 2px rgba(34,38,46,.08), 0 6px 24px -8px rgba(34,38,46,.18);
  --grid: rgba(31,90,133,.05);
  --font-display: "Barlow Condensed", sans-serif;
  --font-body: "Source Serif 4", Georgia, serif;
  --font-mono: "IBM Plex Mono", monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #14181f; --paper-2: #1b2029; --paper-3: #252b36;
    --ink: #e9e4d8; --ink-soft: #b8b3a8; --ink-faint: #858a96;
    --accent: #7fb2dc; --accent-deep: #a9cdea;
    --amber: #e0a43a; --amber-soft: #3a2f1c;
    --ok: #7fbf95; --shaky: #e0a43a; --miss: #e3826f;
    --line: #333a47; --card: #1a1f28;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 28px -10px rgba(0,0,0,.6);
    --grid: rgba(127,178,220,.04);
  }
}
:root[data-theme="dark"] {
  --paper: #14181f; --paper-2: #1b2029; --paper-3: #252b36;
  --ink: #e9e4d8; --ink-soft: #b8b3a8; --ink-faint: #858a96;
  --accent: #7fb2dc; --accent-deep: #a9cdea; --amber: #e0a43a; --amber-soft: #3a2f1c;
  --ok: #7fbf95; --shaky: #e0a43a; --miss: #e3826f; --line: #333a47; --card: #1a1f28;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 28px -10px rgba(0,0,0,.6); --grid: rgba(127,178,220,.04);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font-family: var(--font-body); font-size: 17px; line-height: 1.6;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 48px 48px;
}
a { color: inherit; }
button { font: inherit; color: inherit; }
kbd { font-family: var(--font-mono); font-size: 11px; border: 1px solid currentColor; border-radius: 3px; padding: 0 4px; opacity: .6; margin-left: 6px; }

/* header */
.masthead { border-bottom: 3px double var(--ink); background: var(--paper); position: sticky; top: 0; z-index: 50; }
.masthead-inner { max-width: 860px; margin: 0 auto; padding: 10px 16px; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.brand { font-family: var(--font-display); font-weight: 600; font-size: 22px; letter-spacing: .14em; text-transform: uppercase; text-decoration: none; display: flex; align-items: center; gap: 9px; }
.brand small { font-family: var(--font-mono); font-size: 10px; letter-spacing: .06em; color: var(--ink-faint); text-transform: none; }
.ring { width: 18px; height: 18px; border-radius: 50%; border: 2.5px solid var(--ink); position: relative; flex: none; }
.ring::after { content: ""; position: absolute; left: -4px; right: -4px; top: 50%; height: 2.5px; margin-top: -1.25px; background: var(--amber); }
.nav { display: flex; gap: 2px; margin-left: auto; }
.nav a { font-family: var(--font-display); font-weight: 500; font-size: 15px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-soft); text-decoration: none; padding: 6px 10px; border-bottom: 3px solid transparent; }
.nav a:hover { color: var(--ink); background: var(--paper-2); }
.nav a.active { color: var(--ink); border-bottom-color: var(--accent); }

.wrap { max-width: 860px; margin: 0 auto; padding: 24px 16px 80px; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 6px; box-shadow: var(--shadow); padding: 20px 22px; margin: 18px 0; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; letter-spacing: .02em; line-height: 1.15; }
h1 { font-size: clamp(30px, 5.5vw, 44px); margin: 6px 0 10px; }
h2 { font-size: 28px; margin: 6px 0 12px; }
h3 { font-size: 21px; margin: 0 0 10px; letter-spacing: .06em; text-transform: uppercase; }
.eyebrow { font-family: var(--font-mono); font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--accent); margin: 0; }
.lede { font-size: 19px; color: var(--ink-soft); max-width: 60ch; margin: 0; }
.statline { font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-faint); }

/* buttons */
.btn { background: var(--accent); color: #fff; border: 0; border-radius: 4px; padding: 10px 18px; font-family: var(--font-display); font-weight: 600; font-size: 18px; letter-spacing: .08em; text-transform: uppercase; cursor: pointer; display: inline-flex; align-items: center; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .btn:not(.ghost) { color: #10141a; } }
.btn:hover { background: var(--accent-deep); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.big { font-size: 22px; padding: 14px 28px; }
.btn.ghost { background: transparent; color: var(--ink); border: 1.5px solid var(--line); }
.btn.ghost:hover { background: var(--paper-2); }
.btn.danger { color: var(--miss); }
.btn.file { cursor: pointer; }
.link { background: none; border: 0; padding: 4px 2px; color: var(--ink-soft); text-decoration: underline; text-underline-offset: 3px; cursor: pointer; font-size: 15px; }
.actions { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin-top: 14px; }
.actions.center { justify-content: center; }

/* home */
.hero { margin: 18px 0 6px; }
.start-row { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
.seg { display: inline-flex; border: 1.5px solid var(--line); border-radius: 4px; overflow: hidden; }
.seg button { background: none; border: 0; padding: 8px 14px; font-family: var(--font-mono); font-size: 14px; cursor: pointer; color: var(--ink-soft); }
.seg button + button { border-left: 1.5px solid var(--line); }
.seg button.on { background: var(--ink); color: var(--paper); }
.areas-pick { margin-top: 16px; }
.areas-pick summary { cursor: pointer; font-family: var(--font-display); font-size: 17px; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-soft); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.chip { background: var(--paper-2); border: 1.5px solid var(--line); border-radius: 999px; padding: 5px 12px; font-size: 14.5px; cursor: pointer; text-align: left; }
.chip b { font-family: var(--font-mono); font-size: 12px; color: var(--accent); margin-right: 3px; }
.chip span { font-family: var(--font-mono); font-size: 11.5px; color: var(--ink-faint); margin-left: 4px; }
.chip.on { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, var(--card)); }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.tile { background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 14px 16px; border-top: 4px solid var(--line); }
.tile.ok { border-top-color: var(--ok); } .tile.shaky { border-top-color: var(--shaky); }
.tile .n { font-family: var(--font-display); font-size: 38px; font-weight: 600; line-height: 1; }
.tile .l { font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-faint); margin-top: 4px; }
.weak { margin: 0; padding-left: 22px; } .weak li { margin: 6px 0; }

/* play */
.qmeta { display: flex; gap: 14px; align-items: baseline; flex-wrap: wrap; font-family: var(--font-mono); font-size: 13px; color: var(--ink-soft); }
.qmeta #q-area { color: var(--accent); }
.qmeta .link { margin-left: auto; font-size: 13px; }
.progressbar { height: 4px; background: var(--paper-3); border-radius: 2px; margin: 10px 0 0; overflow: hidden; }
.progressbar i { display: block; height: 100%; background: var(--accent); transition: width .3s; }
.qcard { border-left: 5px solid var(--accent); }
.qcard.is-drill { border-left-color: var(--amber); background: linear-gradient(var(--amber-soft), var(--card) 90px); }
.drill-tag { display: inline-block; font-family: var(--font-display); font-weight: 600; font-size: 15px; letter-spacing: .12em; text-transform: uppercase; color: var(--amber); border: 1.5px solid var(--amber); border-radius: 3px; padding: 1px 8px; margin-bottom: 8px; }
.drill-tag::before { content: "↳ "; }
.parent-ctx { font-size: 15px; color: var(--ink-soft); margin-bottom: 8px; }
.parent-ctx summary { cursor: pointer; font-family: var(--font-mono); font-size: 12px; }
.parent-ctx p { margin: 6px 0 0; font-style: italic; }
.qtext { font-size: clamp(20px, 3.4vw, 24px); line-height: 1.45; margin: 4px 0 16px; }
textarea { width: 100%; font: inherit; font-size: 16px; background: var(--paper); color: var(--ink); border: 1.5px solid var(--line); border-radius: 4px; padding: 10px 12px; resize: vertical; }
textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.answer p { margin: 0 0 10px; font-size: 18px; }
.answer .mine { font-size: 15.5px; color: var(--ink-soft); border-left: 3px solid var(--line); padding-left: 10px; }
.answer .mine span { display: block; font-family: var(--font-mono); font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-faint); }
.points-h { font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-faint); margin: 14px 0 4px; }
.points { list-style: none; margin: 0; padding: 0; }
.points li { margin: 2px 0; }
.points label { display: flex; gap: 10px; align-items: flex-start; padding: 6px 8px; border-radius: 4px; cursor: pointer; }
.points label:hover { background: var(--paper-2); }
.points input { width: 19px; height: 19px; margin-top: 4px; accent-color: var(--ok); flex: none; }
.points input:checked + span { color: var(--ok); }
.source { margin: 14px 0 4px; font-size: 15px; }
.source summary { cursor: pointer; font-family: var(--font-mono); font-size: 12.5px; color: var(--accent); }
.source blockquote { margin: 8px 0 4px; padding: 8px 12px; border-left: 3px solid var(--accent); background: var(--paper-2); font-style: italic; }
.grade { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 18px; }
.g { border: 2px solid; border-radius: 5px; padding: 12px 6px; background: transparent; font-family: var(--font-display); font-weight: 600; font-size: 19px; letter-spacing: .06em; text-transform: uppercase; cursor: pointer; }
.g.ok { color: var(--ok); } .g.shaky { color: var(--shaky); } .g.miss { color: var(--miss); }
.g:hover, .g.suggest { background: currentColor; }
.g:hover, .g.suggest { color: var(--card) !important; }
.g.ok:hover, .g.ok.suggest { background: var(--ok); } .g.shaky:hover, .g.shaky.suggest { background: var(--shaky); } .g.miss:hover, .g.miss.suggest { background: var(--miss); }
.hint { min-height: 1.4em; margin: 8px 0 0; text-align: center; }

/* done */
.scoreboard { text-align: center; }
.tally { display: flex; justify-content: center; gap: 28px; margin: 14px 0 6px; }
.tally .n { font-family: var(--font-display); font-size: 54px; font-weight: 600; line-height: 1; }
.tally .ok .n { color: var(--ok); } .tally .shaky .n { color: var(--shaky); } .tally .miss .n { color: var(--miss); }
.tally .l { font-family: var(--font-mono); font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-faint); }
.rev { border-top: 1px solid var(--line); padding: 10px 0; }
.rev summary { cursor: pointer; font-weight: 600; }
.rev p { margin: 8px 0 0; }

/* progress */
.abar { margin: 10px 0 16px; }
.abar-h { display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.abar-h b { font-family: var(--font-mono); color: var(--accent); }
.abar-h .statline { margin-left: auto; }
.stack { height: 12px; background: var(--paper-3); border-radius: 3px; overflow: hidden; display: flex; margin-top: 5px; }
.stack i, .legend i { display: block; height: 100%; }
.stack i.ok, .legend i.ok { background: var(--ok); } .stack i.shaky, .legend i.shaky { background: var(--shaky); }
.legend i { display: inline-block; width: 11px; height: 11px; border-radius: 2px; background: var(--paper-3); vertical-align: -1px; margin: 0 4px 0 10px; }
.prose li { margin: 8px 0; }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .panel { padding: 16px; }
  .brand small { display: none; }
  .nav a { padding: 6px 7px; font-size: 14px; }
  .grid3 { gap: 8px; } .tile { padding: 10px; } .tile .n { font-size: 30px; }
  .g { font-size: 16px; padding: 12px 2px; }
  .g kbd { display: none; }
  .btn.big { width: 100%; justify-content: center; }
  .tally { gap: 18px; }
}