/* vocalrangetest.app — dark-first real-time instrument.
   Product rules borrowed, not identities: Ableton-like dense utility rails,
   Shazam-like single centre action, Apple Music Sing-like immediate feedback. */

:root {
  color-scheme: dark;
  --bg: #080b0e;
  --bg-grid: rgba(93, 246, 224, .025);
  --surface: #0d1317;
  --surface-2: #111a20;
  --surface-3: #172229;
  --ink: #f1f7f6;
  --muted: #a1b8c2;
  --faint: #71858e;
  --line: #26363e;
  --line-strong: #3b515b;
  --accent: #5df6e0;
  --accent-ink: #03110f;
  --warn: #ffcb66;
  --bad: #ff7d86;
  --good: #5df6e0;
  --shadow: 0 18px 70px rgba(0, 0, 0, .42);
  --radius: 12px;
  --max: 1180px;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #edf3f2;
  --bg-grid: rgba(8, 38, 34, .035);
  --surface: #fbfdfc;
  --surface-2: #f0f6f4;
  --surface-3: #e3eeeb;
  --ink: #091512;
  --muted: #3f5650;
  --faint: #5f746f;
  --line: #c8d8d4;
  --line-strong: #9db6af;
  --accent: #087f72;
  --accent-ink: #fff;
  --warn: #97620c;
  --bad: #ae3540;
  --good: #087f72;
  --shadow: 0 18px 60px rgba(28, 57, 51, .14);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  font: 16px/1.55 var(--sans);
  color: var(--ink);
  background:
    linear-gradient(var(--bg-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px),
    var(--bg);
  background-size: 32px 32px;
  -webkit-font-smoothing: antialiased;
}
button, select, input { font: inherit; }
button, select, input[type="range"] { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .56; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
[hidden] { display: none !important; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
.skip-link {
  position: fixed;
  left: 16px;
  top: -64px;
  z-index: 100;
  padding: 10px 14px;
  color: var(--accent-ink);
  background: var(--accent);
}
.skip-link:focus { top: 16px; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: var(--max);
  margin: auto;
  padding: 18px 22px 12px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-size: 15px;
  font-weight: 750;
  letter-spacing: -.015em;
  text-decoration: none;
}
.brand b { color: var(--accent); }
.brand-wave { display: flex; align-items: center; gap: 2px; height: 24px; }
.brand-wave i { display: block; width: 3px; border-radius: 3px; background: var(--accent); }
.brand-wave i:nth-child(1), .brand-wave i:nth-child(5) { height: 8px; }
.brand-wave i:nth-child(2), .brand-wave i:nth-child(4) { height: 16px; }
.brand-wave i:nth-child(3) { height: 24px; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.install-button, .icon-button {
  min-height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--ink);
  background: var(--surface);
}
.install-button { padding: 7px 14px; font-size: 13px; font-weight: 750; }
.install-button[data-install-ready="true"] { color: var(--accent-ink); background: var(--accent); border-color: var(--accent); }
.icon-button { width: 44px; font-size: 18px; }

main { max-width: var(--max); margin: auto; padding: 10px 22px 0; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) auto; column-gap: 30px; align-items: end; margin: 6px 0 18px; }
.signal-line {
  grid-column: 1 / -1;
  margin: 0 0 5px;
  color: var(--accent);
  font: 700 10px/1.4 var(--mono);
  letter-spacing: .15em;
}
.hero h1 {
  margin: 0;
  font-size: clamp(1.85rem, 5vw, 3.6rem);
  line-height: .98;
  letter-spacing: -.055em;
}
.tagline { max-width: 58ch; margin: 10px 0 0; color: var(--muted); }
.mode-nav {
  grid-column: 2;
  grid-row: 2 / span 2;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 4px;
  max-width: 450px;
}
.mode-button {
  min-height: 44px;
  padding: 7px 12px;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font: 700 12px/1.2 var(--mono);
  text-transform: uppercase;
}
.mode-button:hover, .mode-button.is-active { color: var(--accent); border-bottom-color: var(--accent); }

.instrument {
  position: relative;
  overflow: hidden;
  min-height: 560px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}
.instrument::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(circle at 50% 25%, rgba(93, 246, 224, .08), transparent 35%);
}
.instrument-rail {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 38px;
  padding: 8px 14px;
  border-bottom: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--faint);
  font: 700 10px/1.3 var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
}
.mic-status { text-align: right; }
.instrument[data-mic-state="listening"] .mic-status { color: var(--accent); }
.instrument[data-mic-state="listening"] .mic-status::before { content: "● "; }

.readout {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(100px, 1.5fr) 1fr 1fr;
  align-items: end;
  max-width: 720px;
  margin: 22px auto 4px;
  padding: 0 24px;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}
.readout strong {
  grid-row: 1 / span 2;
  font-size: clamp(4rem, 12vw, 8.2rem);
  font-weight: 740;
  line-height: .8;
  letter-spacing: -.1em;
  color: var(--ink);
}
.readout > span { padding-left: 24px; color: var(--accent); font-size: clamp(1rem, 2.5vw, 1.6rem); }
.readout small { grid-column: 2 / -1; padding-left: 24px; color: var(--faint); }

.visual-stack { position: relative; z-index: 1; max-width: 960px; margin: 0 auto; padding: 0 22px; }
.spectrum-canvas, .trace-canvas { display: block; width: 100%; height: 108px; }
.trace-canvas { display: none; height: 210px; }
.instrument[data-mode="monitor"] .spectrum-canvas { display: none; }
.instrument[data-mode="monitor"] .trace-canvas { display: block; }

.piano-shell {
  position: relative;
  z-index: 2;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 12px 16px 26px;
  perspective: 760px;
  scrollbar-color: var(--line-strong) transparent;
}
.piano {
  display: flex;
  align-items: flex-start;
  width: max(900px, 100%);
  height: 126px;
  padding: 7px 9px 9px;
  transform: rotateX(9deg);
  transform-origin: center bottom;
  border: 1px solid #000;
  border-radius: 8px;
  background: #050708;
  box-shadow: 0 20px 35px rgba(0, 0, 0, .5);
}
.piano-key {
  position: relative;
  min-width: 0;
  border: 1px solid #101617;
  border-radius: 0 0 3px 3px;
  padding: 0;
  transition: transform 80ms ease, background 80ms ease, box-shadow 80ms ease;
}
.piano-key span {
  position: absolute;
  bottom: 5px;
  left: 50%;
  overflow: hidden;
  width: 0;
  height: 0;
  color: transparent;
}
.piano-key.is-white {
  z-index: 1;
  flex: 1 1 0;
  height: 104px;
  background: linear-gradient(90deg, #d6dfdc, #fff 45%, #cad4d1);
}
.piano-key.is-black {
  z-index: 2;
  flex: .62 1 0;
  height: 66px;
  margin: 0 -.31%;
  background: linear-gradient(90deg, #030405, #1d2629 55%, #050708);
  border-color: #000;
  box-shadow: 0 6px 7px rgba(0, 0, 0, .6);
}
.piano-key.is-live {
  z-index: 4;
  background: var(--accent);
  box-shadow: 0 0 0 2px rgba(93, 246, 224, .35), 0 0 28px rgba(93, 246, 224, .8);
  transform: translateY(3px);
}
.piano-key.is-target:not(.is-live) { box-shadow: inset 0 -5px 0 var(--warn), 0 0 10px rgba(255, 203, 102, .28); }
.piano-key.is-pressed { transform: translateY(5px); }

.mode-panel {
  position: relative;
  z-index: 2;
  display: none;
  max-width: 720px;
  margin: 0 auto 16px;
  padding: 0 22px;
}
.instrument[data-mode="range"] .range-panel,
.instrument[data-mode="tuner"] .tuner-panel,
.instrument[data-mode="warmup"] .warmup-panel { display: block; }
.capture-prompt { margin: 0 0 8px; color: var(--muted); text-align: center; }
#capture-progress { display: block; width: min(420px, 100%); height: 9px; margin: 10px auto 0; accent-color: var(--accent); }
.capture-feedback { min-height: 24px; margin: 8px 0 10px; color: var(--faint); font: 12px/1.4 var(--mono); text-align: center; }
.tuner-face {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface-2);
}
.tuner-face canvas { grid-column: 1 / -1; width: 100%; height: 90px; }
.tuner-face strong { color: var(--muted); }
.tuner-face > span { color: var(--accent); font: 800 1.25rem var(--mono); }
.tuner-face small { grid-column: 1 / -1; color: var(--faint); }
[data-tuner-state="flat"] [data-tuner-status],
[data-tuner-state="sharp"] [data-tuner-status] { color: var(--warn); }
[data-tuner-state="tuned"] [data-tuner-status] { color: var(--good); }
.control-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  align-items: end;
  gap: 8px;
  margin-top: 10px;
}
.control-grid label { display: grid; gap: 4px; color: var(--faint); font: 650 11px var(--mono); text-transform: uppercase; }
select {
  width: 100%;
  min-height: 44px;
  padding: 7px 9px;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  color: var(--ink);
  background: var(--surface-3);
}
input[type="range"] { width: 100%; accent-color: var(--accent); }
output { color: var(--accent); }
.warmup-readout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px 18px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface-2);
}
.warmup-readout strong { font: 800 1.5rem var(--mono); color: var(--accent); }
.warmup-readout span { color: var(--muted); }
#warmup-feedback { grid-column: 1 / -1; color: var(--warn); font: 700 13px var(--mono); }
.instrument[data-warmup-hit="true"] #warmup-feedback { color: var(--good); }

.mic-actions {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: center;
  gap: 9px;
  padding: 4px 22px 22px;
}
.btn {
  min-height: 44px;
  padding: 9px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--ink);
  background: var(--surface-2);
  font-size: 14px;
  font-weight: 750;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { color: var(--accent-ink); background: var(--accent); border-color: var(--accent); }
.btn.secondary { background: var(--surface-3); }
.btn.quiet { min-height: 44px; padding: 7px 12px; color: var(--muted); background: transparent; }
.btn.is-ready { animation: ready-pulse 1.2s ease-in-out infinite; }
.mic-error {
  position: relative;
  z-index: 2;
  max-width: 600px;
  margin: -8px auto 20px;
  padding: 9px 12px;
  border-left: 3px solid var(--bad);
  color: var(--bad);
  background: rgba(255, 125, 134, .08);
}

.result-card {
  max-width: 760px;
  margin: 18px auto 0;
  padding: 20px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: var(--surface);
}
.result-kicker { margin: 0; color: var(--accent); font: 700 10px var(--mono); letter-spacing: .14em; text-transform: uppercase; }
.result-main { display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.result-main strong { font: 800 clamp(2.5rem, 8vw, 5rem)/1 var(--mono); letter-spacing: -.07em; }
.result-main span { color: var(--accent); font: 700 1.1rem var(--mono); }
.result-status { color: var(--accent); font: 700 13px/1.4 var(--mono); }
.result-honesty { max-width: 65ch; color: var(--muted); }
.result-actions { display: flex; flex-wrap: wrap; gap: 8px; }

.content { max-width: 76ch; margin: 46px auto 0; }
.content h2 { margin: 32px 0 10px; font-size: 1.2rem; letter-spacing: -.02em; }
.content .intro { color: var(--muted); font-size: 1.06rem; }
.route-detail { padding: 2px 0 2px 18px; border-left: 2px solid var(--accent); }
.route-detail p { color: var(--muted); }
.mode-guide ul { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; padding: 0; list-style: none; }
.mode-guide li { min-height: 110px; padding: 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); }
.mode-guide li strong, .mode-guide li span { display: block; }
.mode-guide li span { margin-top: 5px; color: var(--muted); font-size: 12px; line-height: 1.4; }
.howto ol { padding-left: 22px; }
.howto li { margin: 8px 0; color: var(--muted); }
.howto li strong { color: var(--ink); }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; padding: 14px 30px 14px 0; font-weight: 700; }
.faq summary::marker { color: var(--accent); }
.faq details p { color: var(--muted); }

.site-footer { margin-top: 58px; border-top: 1px solid var(--line); color: var(--faint); }
.site-footer > div { max-width: var(--max); margin: auto; padding: 24px 22px 42px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; font-size: 13px; }
.footer-nav a { color: var(--muted); }
.site-footer p { max-width: 70ch; font-size: 12px; }

dialog {
  width: min(620px, calc(100% - 32px));
  max-height: 82vh;
  overflow: auto;
  padding: 18px 22px 24px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--surface);
  box-shadow: var(--shadow);
}
dialog::backdrop { background: rgba(0, 0, 0, .72); backdrop-filter: blur(4px); }
.dialog-close { display: flex; justify-content: flex-end; }
.dialog-kicker { color: var(--accent); font: 700 10px var(--mono); letter-spacing: .12em; text-transform: uppercase; }
dialog h2 { margin-top: 0; }
dialog article h2 { font-size: 1.7rem; }
dialog article h3, .legal-page h3 { margin: 24px 0 5px; }
dialog article p, .legal-page p { color: var(--muted); }
.legal-page { max-width: 72ch; margin: 20px auto; padding: 20px 22px 50px; }
.legal-page h1 { font-size: clamp(2rem, 7vw, 3.6rem); letter-spacing: -.045em; }
.legal-date { color: var(--faint); font-size: 13px; }
.noscript { max-width: 70ch; margin: 20px auto; padding: 12px 16px; border: 1px solid var(--warn); color: var(--warn); }

@keyframes ready-pulse {
  50% { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(93, 246, 224, .14); }
}

@media (max-width: 820px) {
  .hero { display: block; }
  .mode-nav { justify-content: flex-start; margin-top: 14px; }
  .instrument { min-height: 540px; }
  .control-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 540px) {
  .site-header, main { padding-left: 14px; padding-right: 14px; }
  .brand > span:last-child { font-size: 14px; }
  .hero h1 { font-size: 2.2rem; }
  .tagline { font-size: 14px; }
  .mode-nav { flex-wrap: nowrap; overflow-x: auto; margin-left: -6px; padding-bottom: 4px; }
  .mode-button { white-space: nowrap; }
  .instrument-rail { align-items: flex-start; }
  .readout { grid-template-columns: 1.2fr 1fr; margin-top: 18px; padding: 0 16px; }
  .readout strong { font-size: 4.6rem; }
  .readout > span { padding-left: 14px; }
  .readout > span:nth-of-type(2) { grid-column: 2; }
  .readout small { grid-column: 1 / -1; padding: 8px 0 0; }
  .visual-stack { padding: 0 12px; }
  .piano-shell { padding-left: 10px; padding-right: 10px; }
  .mode-panel { padding-left: 14px; padding-right: 14px; }
  .control-grid { grid-template-columns: 1fr; }
  .warmup-readout { grid-template-columns: 1fr; }
  #warmup-feedback { grid-column: 1; }
  .mic-actions { padding-left: 14px; padding-right: 14px; }
  .mic-actions .btn { flex: 1; }
  .content { margin-top: 34px; }
  .mode-guide ul { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  .piano { transform: none; }
  dialog::backdrop { backdrop-filter: none; }
}