:root {
  color-scheme: dark;
  --bg: #0b0d12;
  --panel: #12161e;
  --panel-2: #171c26;
  --line: #222836;
  --line-strong: #2e3647;
  --text: #e8eaf0;
  --muted: #8b93a7;
  --faint: #566074;
  --green: #36e07f;
  --orange: #ff9c3b;
  --red: #ff4d5e;
  --accent: #7cc4ff;
  --radius: 14px;
  --gap: 12px;
  --ui: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --ipa: 'Noto Serif', 'Gentium Plus', 'Charis SIL', Georgia, serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; } /* component display rules must never override hidden */
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 var(--ui);
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

/* ---------- top bar ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 12px 20px; border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 600; letter-spacing: .01em; }
.brand-mark {
  width: 18px; height: 18px; border-radius: 5px;
  background: conic-gradient(from 200deg, var(--accent), var(--green), var(--orange), var(--accent));
}
.brand-sep { color: var(--faint); font-weight: 400; }
.brand-app { color: var(--muted); font-weight: 500; }
.controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.controls button, .chip { white-space: nowrap; }

.segmented {
  display: inline-flex; padding: 3px; gap: 2px;
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px;
}
.segmented button {
  font: 500 13px var(--ui); color: var(--muted); background: none; border: 0;
  padding: 6px 12px; border-radius: 7px; cursor: pointer;
}
.segmented button[aria-checked="true"] { background: var(--line-strong); color: var(--text); }
.segmented button:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.chip {
  font-size: 12px; color: var(--muted); padding: 4px 10px; border-radius: 999px;
  border: 1px solid var(--line); display: inline-flex; align-items: center; gap: 6px;
}
.chip::before { content: ''; width: 7px; height: 7px; border-radius: 50%; background: var(--red); animation: pulse 1.6s infinite; }
@keyframes pulse { 50% { opacity: .35; } }

.btn {
  font: 600 14px var(--ui); border-radius: 10px; padding: 10px 18px; cursor: pointer;
  border: 1px solid transparent; transition: transform .08s ease, background .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-primary { background: var(--green); color: #04150b; }
.btn-primary:hover { background: #4ff093; }
.btn-secondary { background: var(--panel-2); color: var(--text); border-color: var(--line-strong); }
.btn-secondary:hover { background: #1e2431; }
.btn-ghost { background: none; color: var(--muted); border-color: var(--line); padding: 6px 14px; font-size: 13px; }
.btn-ghost:hover { color: var(--text); border-color: var(--line-strong); }

/* ---------- dashboard ---------- */
.dashboard {
  flex: 1;
  display: grid;
  gap: var(--gap);
  padding: var(--gap) 20px 16px;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: repeat(3, minmax(0, 1fr));
  grid-template-areas:
    "tuner tuner"
    "f3 map"
    "meter meter";
  min-height: 0;
}
@media (min-width: 761px) {
  /* Everything in one field of view: thirds, no page scroll */
  body { height: 100dvh; overflow: hidden; }
}
.panel {
  position: relative; background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); overflow: hidden; min-width: 0; min-height: 0;
}
.panel canvas { display: block; }
/* Canvases fill a positioned box so their pixel size can never feed back into layout. */
.fill { position: relative; min-width: 0; min-height: 0; }
.fill > canvas, .f3 > canvas, .vowels > canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.panel-label {
  position: absolute; top: 10px; left: 14px; z-index: 2;
  font-size: 11px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--muted);
  pointer-events: none;
}
.panel-label .muted { color: var(--faint); font-weight: 500; text-transform: none; letter-spacing: 0; }

.tuner { grid-area: tuner; display: grid; grid-template-columns: minmax(220px, 300px) 1fr; grid-template-rows: minmax(0, 1fr); }
.f3 { grid-area: f3; }
.vowels { grid-area: map; }
.meter { grid-area: meter; }
.meter .fill { position: absolute; inset: 0; }

/* tuner readout */
.tuner-readout {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 22px 16px 8px; border-right: 1px solid var(--line); gap: 2px; min-height: 0;
}
.note {
  font-weight: 700; font-size: clamp(44px, 8.5vh, 76px); line-height: 1; letter-spacing: -.03em;
  color: var(--faint); display: flex; align-items: flex-start;
  font-variant-numeric: tabular-nums;
}
.note .oct { font-size: 22px; font-weight: 600; margin: 8px 0 0 4px; color: var(--faint); letter-spacing: 0; }
.note.in { color: var(--green); text-shadow: 0 0 28px rgba(54, 224, 127, .35); }
.note.near { color: var(--orange); }
.note.off { color: var(--text); }
.tune-state { font-size: 13px; color: var(--muted); height: 20px; }
.tuner .gauge { width: 100%; max-width: 260px; height: 40px; margin-top: 8px; flex: none; }

/* map */
.map-hint {
  position: absolute; right: 14px; bottom: 12px; font-size: 12px; color: var(--orange);
  background: rgba(255, 156, 59, .08); border: 1px solid rgba(255, 156, 59, .25);
  padding: 4px 10px; border-radius: 999px;
}

/* meter */
.clip {
  position: absolute; top: 8px; right: 14px; z-index: 2; font-size: 11px; font-weight: 700; letter-spacing: .08em;
  padding: 5px 9px; border-radius: 6px; color: var(--faint); border: 1px solid var(--line);
  transition: all .1s ease;
}
.clip.on { color: #fff; background: var(--red); border-color: var(--red); box-shadow: 0 0 18px rgba(255, 77, 94, .5); }

/* ---------- landing ---------- */
.landing {
  position: fixed; inset: 0; z-index: 10; display: grid; place-items: center; padding: 16px;
  background: radial-gradient(1200px 600px at 50% 30%, rgba(124, 196, 255, .08), transparent 60%), rgba(11, 13, 18, .82);
  backdrop-filter: blur(6px);
}
.landing[hidden] { display: none; }
.landing-card {
  max-width: 520px; background: var(--panel); border: 1px solid var(--line-strong);
  border-radius: 18px; padding: 32px; box-shadow: 0 30px 80px rgba(0, 0, 0, .5);
}
.landing-kicker { font-size: 12px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--green); }
.landing h1 { font-size: 30px; line-height: 1.2; margin: 0 0 6px; letter-spacing: -.02em; }
.landing-card { min-width: min(400px, 100%); }
.landing p { color: var(--muted); margin: 0 0 20px; }
.landing-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.fineprint { font-size: 12px; color: var(--faint) !important; margin: 0 !important; }
.error {
  color: #ffb3ba !important; background: rgba(255, 77, 94, .08); border: 1px solid rgba(255, 77, 94, .3);
  padding: 10px 12px; border-radius: 10px; font-size: 13px;
}

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .topbar { padding: 10px 16px; row-gap: 8px; }
  .controls { width: 100%; }
  .controls .chip { margin-left: auto; }
  .segmented button { padding: 6px 10px; font-size: 12px; }
  .brand-sep, .brand-name { display: none; }
  .dashboard {
    flex: none;
    padding: 10px 16px 16px; gap: 10px;
    grid-template-columns: 64px 1fr; /* F3 compressed so the vowel map gets the width */
    grid-template-rows: auto 400px 150px;
  }
  .tuner { grid-template-columns: 1fr; grid-template-rows: auto 120px; }
  .f3 .panel-label .muted { display: none; }
  .f3 .panel-label { left: 10px; }
  .tuner-readout { border-right: 0; border-bottom: 1px solid var(--line); padding: 28px 12px 10px; }
  .note { font-size: 60px; }
  .landing-card { padding: 24px; }
  .landing h1 { font-size: 23px; }
}

/* ---------- toggles ---------- */
.toggles { display: inline-flex; gap: 6px; }
.toggle {
  font: 500 13px var(--ui); color: var(--muted); background: var(--panel);
  border: 1px solid var(--line); border-radius: 9px; padding: 6px 11px; cursor: pointer;
}
.toggle:hover { color: var(--text); border-color: var(--line-strong); }
.toggle[aria-pressed="true"] { color: var(--accent); border-color: rgba(124, 196, 255, .45); background: rgba(124, 196, 255, .08); }
.toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.detail-readout { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; height: 16px; }
.detail-readout[hidden] { display: none; }

/* ---------- calibration ---------- */
.vowel-tools { position: absolute; top: 7px; right: 12px; z-index: 2; display: flex; gap: 8px; align-items: center; }
.toggle.mini { font-size: 11px; padding: 3px 9px; border-radius: 999px; }
.cal-badge {
  font-size: 11px; font-weight: 600;
  color: var(--accent); background: rgba(124, 196, 255, .08); border: 1px solid rgba(124, 196, 255, .3);
  padding: 3px 10px; border-radius: 999px;
}
.cal-badge[hidden] { display: none; }
.linkish { font: inherit; color: var(--muted); background: none; border: 0; padding: 0 0 0 4px; cursor: pointer; text-decoration: underline; }
.linkish:hover { color: var(--text); }

.cal-panel {
  position: fixed; right: 20px; top: 66px; z-index: 8; width: 340px; max-width: calc(100vw - 32px);
  background: var(--panel-2); border: 1px solid var(--line-strong); border-radius: 16px; padding: 18px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .55);
}
.cal-panel[hidden] { display: none; }
.cal-head { display: flex; align-items: center; justify-content: space-between; }
.cal-head h2 { font-size: 16px; margin: 0; }
.icon-btn { background: none; border: 0; color: var(--muted); font-size: 22px; line-height: 1; cursor: pointer; padding: 2px 6px; border-radius: 6px; }
.icon-btn:hover { color: var(--text); background: var(--line); }
.cal-intro { color: var(--muted); font-size: 13px; margin: 8px 0 12px; }
.cal-intro b { color: var(--text); font-weight: 600; }
.cal-chips { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.cal-chip {
  font: 400 18px var(--ipa); width: 38px; height: 38px; border-radius: 10px; cursor: pointer;
  background: var(--panel); color: var(--text); border: 1px solid var(--line-strong); position: relative;
}
.cal-chip.optional { color: var(--muted); }
.cal-chip[aria-selected="true"] { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }
.cal-chip.done::after {
  content: '✓'; position: absolute; top: -6px; right: -6px; font: 700 10px var(--ui); color: #04150b;
  background: var(--green); border-radius: 50%; width: 15px; height: 15px; display: grid; place-items: center;
}
.cal-stage { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.cal-target { display: flex; align-items: baseline; gap: 10px; }
.cal-target span { font: 400 44px/1 var(--ipa); color: var(--accent); }
.cal-target small { color: var(--muted); font-size: 12px; }
.cal-progress { height: 4px; background: var(--track, #1b2130); border-radius: 2px; margin: 14px 0 8px; overflow: hidden; }
.cal-progress div { height: 100%; width: 0; background: var(--green); }
.cal-msg { font-size: 12px; color: var(--muted); min-height: 18px; margin: 0 0 12px; }
.cal-msg.bad { color: var(--orange); }
.cal-actions { display: flex; gap: 8px; }
.cal-actions .btn:disabled { opacity: .45; cursor: not-allowed; }

@media (max-width: 760px) {
  .toggle { padding: 6px 9px; font-size: 12px; }
  .cal-panel { right: 16px; left: 16px; top: auto; bottom: 16px; width: auto; }
  .vowel-tools { top: auto; bottom: 6px; right: 50%; transform: translateX(50%); white-space: nowrap; }
  .controls { gap: 8px; }
  .controls .chip { display: none; }
}

/* ---------- help ---------- */
.help-btn { width: 32px; padding: 6px 0; font-weight: 700; }
.help {
  width: min(620px, calc(100vw - 32px)); max-height: min(80dvh, 760px); padding: 0;
  background: var(--panel-2); color: var(--text); border: 1px solid var(--line-strong); border-radius: 16px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, .6);
}
.help::backdrop { background: rgba(11, 13, 18, .7); backdrop-filter: blur(4px); }
.help-head {
  display: flex; align-items: center; justify-content: space-between; padding: 16px 20px;
  border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--panel-2);
}
.help-head h2 { margin: 0; font-size: 17px; }
.help-body { padding: 4px 20px 20px; overflow: auto; }
.help-body h3 { font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 18px 0 6px; }
.help-body p { margin: 0; color: #c9cfdb; font-size: 14px; }
.help-body b.g { color: var(--green); } .help-body b.o { color: var(--orange); }
.sources { margin: 0; padding-left: 20px; font-size: 13px; color: #c9cfdb; display: grid; gap: 8px; }
.sources a { color: var(--accent); }
.sources .use { display: block; color: var(--faint); font-size: 12px; }
.help .fineprint { margin-top: 14px !important; }

/* ---------- synthesizer ---------- */
/* Wide + short so it sits over the pitch trace and never covers the vowel map */
.synth-panel { width: min(680px, calc(100vw - 340px)); padding: 12px 16px 14px; }
.synth-panel .cal-head h2 { font-size: 14px; }
.synth-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 8px 0 10px; flex-wrap: wrap; }
.synth-top .cal-chips { margin: 0; }
.synth-top .cal-chip { width: 32px; height: 32px; font-size: 16px; }
.synth-actions { display: flex; align-items: center; gap: 12px; }
.synth-actions .btn { padding: 7px 14px; font-size: 13px; }
.synth-rows { display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: repeat(3, auto); grid-auto-flow: column; column-gap: 22px; row-gap: 6px; }
.srow { display: grid; grid-template-columns: 52px 1fr 98px; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); }
.srow output { color: var(--text); font-variant-numeric: tabular-nums; text-align: right; font-size: 12px; }
.srow input[type="range"] { width: 100%; accent-color: var(--accent); }
.check { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); cursor: pointer; }
.check input { accent-color: var(--accent); }
.cal-chip[aria-pressed="true"] { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; color: var(--accent); }
.chip.synth::before { background: var(--accent); }
@media (max-width: 760px) {
  .synth-panel { width: auto; position: static; margin: 0 16px 16px; box-shadow: none; } /* in flow: never covers the map */
  .synth-rows { grid-template-columns: 1fr; grid-template-rows: none; grid-auto-flow: row; }
  .srow-spacer { display: none; }
}

/* ---------- samples ---------- */
.samples-panel { width: 380px; }
.samples { list-style: none; margin: 10px 0 8px; padding: 0; display: grid; gap: 4px; }
.sample { display: flex; align-items: center; gap: 10px; padding: 6px 8px; border-radius: 10px; }
.sample.on { background: rgba(124, 196, 255, .08); }
.sample-play {
  flex: none; width: 30px; height: 30px; border-radius: 50%; border: 1px solid var(--line-strong);
  background: var(--panel); color: var(--text); cursor: pointer; font-size: 11px;
}
.sample.on .sample-play { background: var(--accent); color: #04121f; border-color: var(--accent); }
.sample-text { font-size: 13px; line-height: 1.3; min-width: 0; }
.sample-text i { color: var(--text); }
.sample-meta { font-size: 11px; color: var(--faint); }
.sample-note { font-size: 11px; color: var(--faint); margin: 0; }
@media (max-width: 760px) {
  .samples-panel { width: auto; position: static; margin: 0 16px 16px; box-shadow: none; }
}

/* ---------- source switch + toast ---------- */
.mode-switch button[aria-checked="true"] { background: rgba(124, 196, 255, .16); color: var(--accent); }
.mode-switch.big { display: flex; width: 100%; padding: 4px; margin: 6px 0 18px; border-radius: 12px; }
.mode-switch.big button { flex: 1; padding: 12px 10px; font-size: 15px; font-weight: 600; color: var(--text); border-radius: 9px; }
.mode-switch.big button:hover { background: var(--line-strong); }
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 20; max-width: min(560px, calc(100vw - 32px));
  background: #2a1418; color: #ffd0d5; border: 1px solid rgba(255, 77, 94, .45); border-radius: 12px;
  padding: 10px 14px; font-size: 13px; box-shadow: 0 16px 40px rgba(0, 0, 0, .5);
}
.toast[hidden] { display: none; }
/* Sing is the primary action: green, like the original Start button */
.mode-switch.big button[data-mode="mic"] { background: var(--green); color: #04150b; }
.mode-switch.big button[data-mode="mic"]:hover { background: #4ff093; }
.mode-switch button[data-mode="mic"][aria-checked="true"] { background: rgba(54, 224, 127, .16); color: var(--green); }

/* ---------- feedback recorder ---------- */
.feedback-btn { color: var(--muted); }
.feedback-btn.recording { color: #fff; background: var(--red); border-color: var(--red); animation: pulse 1.6s infinite; }
.feedback-panel { width: 400px; }
.feedback-panel a { color: var(--accent); }
@media (max-width: 760px) { .feedback-panel { width: auto; position: static; margin: 0 16px 16px; box-shadow: none; } }