:root {
  color-scheme: light dark;
  --paper: #f6f0e7;
  --paper-2: #fffaf2;
  --ink: #152622;
  --muted: #5c6964;
  --line: #c9c0b2;
  --accent: #b64331;
  --accent-dark: #7d2a20;
  --accent-contrast: #fffaf2;
  --good: #23745b;
  --warning: #9a6420;
  --shadow: 0 20px 48px rgb(21 38 34 / 12%);
  --radius: 22px;
  font-family: ui-rounded, "Avenir Next", Avenir, system-ui, sans-serif;
  background: var(--paper);
  color: var(--ink);
}

:root[data-theme="dark"] {
  --paper: #10201d;
  --paper-2: #172a26;
  --ink: #f7efe4;
  --muted: #b8c3bc;
  --line: #40534e;
  --accent: #ff735c;
  --accent-dark: #ff8c79;
  --accent-contrast: #10201d;
  --good: #69d0aa;
  --warning: #f1bc68;
  --shadow: 0 24px 60px rgb(0 0 0 / 28%);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; background: var(--paper); color: var(--ink); }
button, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; }
[hidden] { display: none !important; }

.skip-link {
  position: fixed;
  z-index: 50;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  background: var(--ink);
  color: var(--paper);
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  width: min(1180px, calc(100% - 36px));
  min-height: 72px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 28px;
  border-bottom: 1px solid var(--line);
}

.brand { display: inline-flex; align-items: center; gap: 5px; text-decoration: none; letter-spacing: -.03em; }
.brand span:not(.brand-wave) { font-weight: 600; }
.brand strong { color: var(--accent); }
.brand-wave { font: 800 28px Georgia, serif; margin-right: 3px; }
.header-task { margin: 0; color: var(--muted); font-size: .82rem; text-align: center; }
.variant-nav { display: flex; justify-content: center; gap: 5px; }
.variant-nav a { padding: 8px 11px; border-radius: 8px; text-decoration: none; color: var(--muted); font-size: .86rem; font-weight: 700; }
.variant-nav a:hover, .variant-nav a[aria-current="page"] { background: var(--paper-2); color: var(--ink); }
.variant-nav a[aria-current="page"] { box-shadow: inset 0 -2px var(--accent); }
.theme-toggle { width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 50%; color: var(--ink); background: transparent; cursor: pointer; }

button:focus-visible, a:focus-visible, select:focus-visible, [tabindex="-1"]:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

main { width: min(1120px, calc(100% - 36px)); margin: 0 auto; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 150px;
  align-items: end;
  gap: 30px;
  padding: clamp(34px, 6vh, 68px) 0 26px;
}
.utility-line { margin: 0 0 9px; text-transform: uppercase; letter-spacing: .16em; color: var(--accent); font-size: .72rem; font-weight: 800; }
.hero h1 { max-width: 790px; margin: 0; font: 800 clamp(2.35rem, 6vw, 5.5rem)/.93 Georgia, "Times New Roman", serif; letter-spacing: -.055em; text-wrap: balance; }
.hero > div > p:last-child { margin: 18px 0 0; max-width: 660px; color: var(--muted); font-size: clamp(1rem, 2vw, 1.2rem); }
.hero aside { border-left: 3px solid var(--accent); padding: 4px 0 4px 18px; }
.hero aside strong { display: block; font: 800 2rem Georgia, serif; }
.hero aside span { display: block; margin-top: 3px; color: var(--muted); font-size: .76rem; line-height: 1.3; }

.tool { position: relative; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 18px 0 30px; }
.truth-line { display: flex; align-items: center; gap: 8px; margin-bottom: 17px; color: var(--muted); font-size: .86rem; }
.truth-line span { display: grid; place-items: center; width: 21px; height: 21px; border-radius: 50%; background: var(--good); color: var(--paper); font-weight: 900; }
.truth-line strong { color: var(--ink); }

.instrument {
  min-height: 260px;
  padding: clamp(22px, 4vw, 42px);
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  box-shadow: var(--shadow);
  perspective: 900px;
}
.readout { display: grid; grid-template-columns: 1fr auto; align-items: baseline; }
.readout p { margin: 0; color: color-mix(in srgb, var(--paper) 66%, transparent); text-transform: uppercase; letter-spacing: .15em; font-size: .7rem; font-weight: 800; }
.readout strong { grid-row: span 2; font: 800 clamp(4.2rem, 12vw, 8.5rem)/.8 Georgia, serif; letter-spacing: -.08em; color: var(--paper); }
.readout > span { margin-top: 8px; color: color-mix(in srgb, var(--paper) 72%, transparent); font-variant-numeric: tabular-nums; }
.piano-wrap { margin: 28px -14px 0; overflow: hidden; padding: 10px 14px 28px; }
.piano { position: relative; display: flex; height: 94px; transform: rotateX(15deg) rotateZ(-1deg); transform-origin: center bottom; filter: drop-shadow(0 20px 12px rgb(0 0 0 / 25%)); }
.piano-key { position: relative; flex: 1 0 18px; min-width: 18px; height: 88px; margin: 0 -1px 0 0; padding: 0; border: 1px solid #88918d; border-radius: 0 0 5px 5px; background: #f7f1e8; transform-origin: top; transition: transform 120ms, background 120ms; }
.piano-key.is-black { z-index: 2; flex-basis: 11px; min-width: 11px; height: 54px; margin: 0 -5px; background: #1d2825; border-color: #0c1412; }
.piano-key.is-in-range { background: #f3a193; }
.piano-key.is-black.is-in-range { background: #9b3e30; }
.piano-key.is-active, .piano-key.is-edge { background: var(--accent); transform: translateY(5px) rotateX(-4deg); box-shadow: 0 0 24px var(--accent); }
.pitch-trace { display: block; width: 100%; height: 46px; margin-top: -22px; opacity: .9; }
.trace-help { margin: 3px 0 0; color: color-mix(in srgb, var(--paper) 56%, transparent); font-size: .72rem; }
.capture-copy { display: flex; align-items: center; gap: 10px; margin-top: -9px; }
.capture-copy p { margin: 0; color: color-mix(in srgb, var(--paper) 82%, transparent); }
.phase-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 20%, transparent); }
.hold-feedback { display: grid; grid-template-columns: minmax(120px, 220px) 1fr; align-items: center; gap: 12px; margin-top: 12px; color: color-mix(in srgb, var(--paper) 76%, transparent); font-size: .82rem; }
.hold-feedback progress { width: 100%; height: 8px; accent-color: var(--accent); }

.mic-panel, .manual-panel { display: grid; justify-items: center; gap: 11px; padding-top: 24px; }
.button { min-height: 46px; padding: 0 19px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper-2); color: var(--ink); cursor: pointer; font-weight: 800; }
.button--primary { border-color: var(--accent); background: var(--accent); color: var(--accent-contrast); box-shadow: 0 7px 0 var(--accent-dark); }
.button--primary:hover { transform: translateY(-1px); box-shadow: 0 9px 0 var(--accent-dark); }
.button--primary:active { transform: translateY(5px); box-shadow: 0 2px 0 var(--accent-dark); }
.button--start { min-width: min(360px, 100%); min-height: 58px; font-size: 1.05rem; }
.button--start span { display: inline-block; margin-right: 8px; }
.button--quiet { background: transparent; }
.capture-actions { display: flex; gap: 10px; }
.capture-actions .is-ready { animation: ready 1.2s ease-in-out infinite; }
.capture-status { min-height: 20px; margin: 0; color: var(--muted); font-size: .85rem; text-align: center; }
.capture-status[data-kind="good"] { color: var(--good); }
.capture-status[data-kind="error"] { color: var(--accent-dark); font-weight: 700; }
.capture-status[data-kind="warning"] { color: var(--warning); }
.text-button { min-height: 44px; border: 0; border-bottom: 1px solid currentColor; padding: 10px 0; background: transparent; color: var(--muted); cursor: pointer; }
.manual-panel { width: 100%; padding: 24px 0 0; }
.manual-panel summary { min-height: 44px; padding: 10px 0; color: var(--muted); cursor: pointer; font-weight: 800; text-align: center; }
.manual-panel summary::marker { color: var(--accent); }

.manual-form { display: grid; grid-template-columns: 1fr auto 1fr auto; align-items: end; gap: 15px; width: min(820px, 100%); }
.manual-form label { display: grid; gap: 7px; color: var(--muted); font-size: .78rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; }
.manual-form select { min-height: 49px; padding: 0 38px 0 13px; border: 1px solid var(--line); border-radius: 10px; background: var(--paper-2); color: var(--ink); font-size: 1rem; }

.mic-primer {
  position: absolute;
  z-index: 8;
  inset: auto 50% 20px auto;
  width: min(520px, calc(100% - 24px));
  padding: 25px;
  transform: translateX(50%);
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper-2);
  box-shadow: var(--shadow);
}
.mic-primer > div { display: flex; gap: 11px; align-items: center; }
.mic-primer h2 { margin: 0; font: 800 1.35rem Georgia, serif; }
.mic-primer p { color: var(--muted); line-height: 1.6; }
.primer-mark { color: var(--accent); }

.result-card { scroll-margin-top: 20px; padding: clamp(32px, 6vw, 70px) 0; border-bottom: 1px solid var(--line); }
.result-head { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 20px; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.result-kicker { grid-column: 1 / -1; margin: 0; color: var(--accent); text-transform: uppercase; letter-spacing: .14em; font-size: .72rem; font-weight: 900; }
.result-head h2 { margin: 0; font: 800 clamp(3.4rem, 9vw, 7.4rem)/.85 Georgia, serif; letter-spacing: -.07em; }
.result-head h2 span { margin: 0 .2em; color: var(--muted); font: italic 400 .28em Georgia, serif; letter-spacing: 0; }
.octave-readout { margin: 0; color: var(--muted); white-space: nowrap; }
.octave-readout strong { color: var(--ink); font: 800 2.2rem Georgia, serif; }
.result-facts { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 1px solid var(--line); }
.result-facts > div { display: grid; gap: 6px; padding: 22px 0; }
.result-facts > div + div { padding-left: 28px; border-left: 1px solid var(--line); }
.result-facts span, .result-facts small { color: var(--muted); }
.result-facts strong { font-size: 1.2rem; }
.result-tabs { display: flex; gap: 6px; padding: 18px 0 0; border-bottom: 1px solid var(--line); overflow-x: auto; }
.tab-button { min-height: 44px; padding: 8px 13px; border: 0; border-bottom: 3px solid transparent; background: transparent; color: var(--muted); cursor: pointer; font-weight: 800; white-space: nowrap; }
.tab-button.is-active, .tab-button:hover { border-bottom-color: var(--accent); color: var(--ink); }
.tab-panel { padding: 28px 0; border-bottom: 1px solid var(--line); }
.tab-panel h3 { margin: 0 0 16px; font: 800 1.35rem Georgia, serif; }
.result-definition { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 25px 0 0; }
.result-definition div { padding: 15px; border: 1px solid var(--line); border-radius: 12px; }
.result-definition dt { color: var(--muted); font-size: .78rem; font-weight: 800; text-transform: uppercase; }
.result-definition dd { margin: 8px 0 0; line-height: 1.45; }
.singer-list { margin: 0; padding: 0; list-style: none; }
.singer-row { display: grid; grid-template-columns: 48px 1fr auto; align-items: center; gap: 13px; padding: 13px 0; border-top: 1px solid var(--line); }
.singer-rank { color: var(--accent); font: 800 1rem Georgia, serif; }
.singer-row strong, .singer-row small { display: block; }
.singer-row small, .register, .source-note { color: var(--muted); font-size: .78rem; }
.singer-tools { display: flex; align-items: center; gap: 8px; }
.register { padding: 5px 8px; border: 1px solid var(--line); border-radius: 6px; }
.singer-tools a, .singer-tools button { min-height: 44px; display: inline-flex; align-items: center; border: 0; border-bottom: 1px solid currentColor; padding: 3px 0; background: transparent; color: var(--muted); cursor: pointer; font-size: .76rem; }
.source-note { max-width: 760px; line-height: 1.6; }
.tab-panel ul { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; margin: 0; padding: 0; list-style: none; }
.tab-panel li { display: grid; gap: 4px; padding: 12px 0; border-top: 1px solid var(--line); }
.tab-panel li span, .tab-panel li small { color: var(--muted); }
.tab-panel li small { line-height: 1.45; }
.history-block svg { width: min(500px, 100%); height: 100px; overflow: visible; }
.history-block polyline { fill: none; stroke: var(--accent); stroke-width: 5; stroke-linecap: round; stroke-linejoin: round; }
.history-block p, .empty-history { color: var(--muted); }
.history-heading { display: flex; justify-content: space-between; align-items: center; gap: 15px; }
.result-actions { display: flex; gap: 12px; padding-top: 27px; }
.result-card:not([hidden]) { display: flex; flex-direction: column; }
.result-head { order: 0; }
.result-facts { order: 1; }
.result-tabs { order: 2; }
.tab-panel { order: 3; }
.result-actions { order: 5; }

.route-content { padding: clamp(50px, 8vw, 92px) 0; }
.content-intro { max-width: 760px; font: 400 clamp(1.2rem, 2.5vw, 1.75rem)/1.55 Georgia, serif; }
.trust-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 55px; }
.trust-grid article { padding: 22px; border: 1px solid var(--line); border-radius: 16px; background: var(--paper-2); }
.trust-grid h2 { margin: 0; font: 800 1.45rem/1.05 Georgia, serif; }
.trust-grid p:last-child { margin-bottom: 0; color: var(--muted); line-height: 1.65; }
.eyebrow { margin: 0 0 11px; color: var(--accent); font-size: .72rem; font-weight: 900; letter-spacing: .13em; text-transform: uppercase; }
.howto { margin-top: 52px; }
.howto h2, .faq h2 { font: 800 clamp(1.8rem, 4vw, 3rem)/1 Georgia, serif; letter-spacing: -.035em; }
.howto ol { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin: 25px 0 0; padding: 0; list-style: none; counter-reset: steps; border-top: 1px solid var(--line); }
.howto li { counter-increment: steps; padding: 20px 20px 20px 0; }
.howto li::before { content: "0" counter(steps); display: block; margin-bottom: 18px; color: var(--accent); font: 800 .8rem Georgia, serif; }
.howto li strong, .howto li span { display: block; }
.howto li span { margin-top: 7px; color: var(--muted); font-size: .88rem; line-height: 1.55; }
.faq { margin-top: 65px; max-width: 860px; }
.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { padding: 20px 30px 20px 0; cursor: pointer; font-weight: 800; }
.faq p { max-width: 740px; margin: -3px 0 21px; color: var(--muted); line-height: 1.7; }

.site-footer { width: min(1180px, calc(100% - 36px)); margin: 0 auto; padding: 31px 0 40px; display: grid; grid-template-columns: 1fr auto; gap: 20px 40px; border-top: 1px solid var(--line); }
.site-footer p { margin: 4px 0 0; color: var(--muted); font-size: .8rem; }
.footer-nav { display: flex; gap: 18px; }
.footer-nav a { color: var(--muted); }
.footer-caution { grid-column: 1 / -1; }
dialog { width: min(720px, calc(100% - 28px)); max-height: 86vh; padding: 0; border: 1px solid var(--line); border-radius: 18px; background: var(--paper-2); color: var(--ink); box-shadow: var(--shadow); }
dialog::backdrop { background: rgb(10 20 18 / 65%); backdrop-filter: blur(5px); }
.legal-body { padding: 25px clamp(24px, 6vw, 58px) 52px; }
.legal-body form { display: flex; justify-content: end; }
.legal-body article h2 { font: 800 clamp(2rem, 6vw, 4rem)/1 Georgia, serif; }
.legal-body article p, .legal-page article p { color: var(--muted); line-height: 1.75; }
.legal-page { min-height: 70vh; max-width: 760px; padding: 50px 0; }
.legal-page h1 { font: 800 clamp(2.6rem, 7vw, 5.5rem)/1 Georgia, serif; }
.back-link { display: inline-block; margin-bottom: 40px; color: var(--muted); }
.not-found { min-height: 100vh; display: grid; place-content: center; justify-items: center; text-align: center; }
.not-found p { margin: 0; color: var(--accent); font: 800 5rem Georgia, serif; }
.noscript { margin: 0; padding: 12px; background: var(--accent); color: var(--accent-contrast); text-align: center; }
#toast { position: fixed; z-index: 30; right: 20px; bottom: 20px; max-width: 340px; padding: 12px 17px; border-radius: 9px; background: var(--ink); color: var(--paper); opacity: 0; transform: translateY(10px); pointer-events: none; transition: .2s; }
#toast.is-visible { opacity: 1; transform: translateY(0); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

@keyframes ready { 50% { transform: translateY(-2px); box-shadow: 0 11px 0 var(--accent-dark), 0 0 0 8px color-mix(in srgb, var(--accent) 18%, transparent); } }

@media (max-width: 860px) {
  .site-header { grid-template-columns: 1fr auto; gap: 12px; }
  .header-task { grid-column: 1 / -1; grid-row: 2; text-align: left; padding-bottom: 12px; }
  .hero { grid-template-columns: 1fr; }
  .hero aside { display: none; }
  .manual-form { grid-template-columns: 1fr 20px 1fr; }
  .manual-form .button { grid-column: 1 / -1; }
  .howto ol { grid-template-columns: 1fr 1fr; }
  .trust-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .site-header, main, .site-footer { width: min(100% - 24px, 1120px); }
  .brand span:not(.brand-wave) { display: none; }
  .hero { padding-top: 32px; }
  .hero h1 { font-size: clamp(2.55rem, 14vw, 4.3rem); }
  .truth-line { align-items: flex-start; line-height: 1.45; }
  .instrument { min-height: 240px; padding: 24px 18px; }
  .readout { grid-template-columns: 1fr; }
  .readout strong { grid-row: auto; margin-top: 10px; font-size: 5.2rem; }
  .piano-wrap { margin-top: 14px; }
  .piano-key { flex-basis: 14px; min-width: 14px; }
  .piano-key.is-black { flex-basis: 9px; min-width: 9px; }
  .manual-form { grid-template-columns: 1fr; }
  .manual-form > span { display: none; }
  .result-head { grid-template-columns: 1fr; }
  .result-head h2 { font-size: 4rem; }
  .octave-readout { white-space: normal; }
  .result-facts { grid-template-columns: 1fr; }
  .result-facts > div + div { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
  .result-definition { grid-template-columns: 1fr; }
  .singer-row { grid-template-columns: 38px 1fr; }
  .singer-tools { grid-column: 2; justify-self: start; flex-wrap: wrap; }
  .tab-panel ul { grid-template-columns: 1fr; }
  .howto ol { grid-template-columns: 1fr; }
  .result-actions { display: grid; }
  .site-footer { grid-template-columns: 1fr; }
  .hold-feedback { grid-template-columns: 1fr; }
  .history-heading { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }
}