/* roomtone — warm off-white ground, refined type, the colours are the only
   saturation. Pantone card, not party. */

:root {
  --ground: #F2EFE8;
  --ground-deep: #EAE6DC;
  --ink: #1C1A17;
  --muted: #6E675C;          /* 4.9:1 on the ground — small type must stay legible */
  --hairline: #CFC7B5;       /* control borders */
  --rule: #DFD8CA;           /* editorial rules, decorative */
  --hairline-soft: #E7E1D5;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --gutter: clamp(20px, 5vw, 56px);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--ground);
  color: var(--ink);
}

body {
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 0 var(--gutter) 0;
}

/* A very quiet paper tooth over the whole page. */
.paper {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: .5;
  background-image:
    radial-gradient(circle at 20% 12%, rgba(255,255,255,.55), transparent 55%),
    radial-gradient(circle at 82% 88%, rgba(180,168,145,.16), transparent 60%);
}

.masthead, .sheet, .footer { position: relative; z-index: 1; width: 100%; max-width: 960px; margin: 0 auto; }

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: clamp(20px, 4vw, 40px) 0 clamp(14px, 2.4vw, 22px);
  border-bottom: 1px solid var(--rule);
}

.wordmark {
  font-family: var(--serif);
  font-size: clamp(20px, 3.2vw, 26px);
  font-weight: 400;
  letter-spacing: .012em;
  margin: 0;
}

.masthead-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
}

.badge {
  border: 1px solid var(--ink);
  color: var(--ink);
  padding: 3px 8px 2px;
  letter-spacing: .12em;
}

.badge[hidden] { display: none; }

/* ---------- stage ---------- */

.sheet { flex: 1 0 auto; padding-bottom: 8px; }

.stage-block { margin: clamp(20px, 4vw, 34px) 0 0; }

.stage-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 56vh;
  background: var(--ground-deep);
  border: 1px solid var(--rule);
  overflow: hidden;
}

@supports not (aspect-ratio: 1) {
  .stage-frame { height: 56vw; max-height: 56vh; }
}

#stage { display: block; width: 100%; height: 100%; }

.stage-caption {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin: 9px 0 0;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--muted);
}

.caption-right { text-align: right; }

/* ---------- readout ---------- */

.readout { margin: clamp(22px, 4vw, 38px) 0 0; }
.readout[hidden] { display: none; }

.eyebrow {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--muted);
}

.chord-name {
  font-family: var(--serif);
  font-size: clamp(34px, 8.2vw, 62px);
  line-height: 1.04;
  letter-spacing: -.012em;
  margin: 0;
  opacity: 0;
  transform: translateY(9px);
  transition: opacity .8s ease, transform .8s cubic-bezier(.2,.7,.2,1);
}

.chord-meta {
  margin: 10px 0 0;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
  opacity: 0;
  transition: opacity .8s ease .18s;
}

.readout.in .chord-name { opacity: 1; transform: none; }
.readout.in .chord-meta { opacity: 1; }

.swatches {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin: 22px 0 0;
  padding: 0;
}

.swatches li {
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .55s ease, transform .55s cubic-bezier(.2,.7,.2,1);
}

.readout.in .swatches li { opacity: 1; transform: none; }

.swatch-chip {
  display: block;
  height: clamp(46px, 9vw, 76px);
  border: 1px solid rgba(28,26,23,.16);
}

.swatch-note {
  display: block;
  margin-top: 7px;
  font-family: var(--serif);
  font-size: clamp(13px, 2.4vw, 17px);
}

.swatch-hex {
  display: block;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: .06em;
  color: var(--muted);
}

/* ---------- controls ---------- */

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: clamp(22px, 4vw, 34px) 0 0;
}

.btn {
  font-family: var(--sans);
  font-size: 14px;
  letter-spacing: .01em;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--ink);
  padding: 12px 22px;
  min-height: 46px;
  cursor: pointer;
  transition: background .18s ease, color .18s ease, opacity .18s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn[hidden] { display: none; }

.btn-primary { background: var(--ink); color: var(--ground); }
.btn-quiet { border-color: #C6BFB1; color: var(--ink); }

.btn:hover:not(:disabled) { background: var(--ink); color: var(--ground); }
.btn-primary:hover:not(:disabled) { background: #34302a; }
.btn-quiet:hover:not(:disabled) { background: var(--muted); color: var(--ground); border-color: var(--muted); }

.btn:disabled { opacity: .38; cursor: default; }

:where(button, input, [tabindex]):focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

/* ---------- sources ---------- */

.sources {
  margin: clamp(26px, 5vw, 44px) 0 0;
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--rule);
}

.source-row {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.row-label {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 11px;
  min-width: 52px;
}

.chips { display: flex; flex-wrap: wrap; gap: 8px; flex: 1; }

.chip {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--hairline);
  padding: 9px 14px;
  min-height: 40px;
  cursor: pointer;
  transition: border-color .18s ease, color .18s ease, background .18s ease;
  -webkit-tap-highlight-color: transparent;
}

.chip:hover { border-color: var(--ink); color: var(--ink); }
.chip[aria-pressed="true"] { border-color: var(--ink); color: var(--ink); background: rgba(28,26,23,.05); }
.chip-action { border-style: dashed; }
.chip:disabled { opacity: .4; cursor: default; }

.card-fallback {
  margin: 20px 0 0;
  max-width: 340px;
}

.card-fallback[hidden] { display: none; }

.card-fallback img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
}

.card-fallback figcaption {
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}

.note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--muted);
  max-width: 62ch;
}

.note.warn { color: var(--ink); }

/* ---------- colophon ---------- */

.colophon {
  margin: clamp(30px, 6vw, 52px) 0 0;
  padding-top: clamp(18px, 3vw, 26px);
  border-top: 1px solid var(--rule);
  max-width: 66ch;
}

.colophon p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--muted);
}

.colophon strong { color: var(--ink); font-weight: 600; }

/* ---------- footer ---------- */

.footer {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: clamp(26px, 5vw, 44px) 0 clamp(22px, 4vw, 34px);
  margin-top: clamp(26px, 5vw, 44px);
  border-top: 1px solid var(--hairline-soft);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- responsive ---------- */

@media (max-width: 600px) {
  .stage-frame { aspect-ratio: 4 / 3; max-height: 52vh; }
  .masthead { padding-top: 18px; }
  .masthead-meta { font-size: 9.5px; gap: 9px; }
  .privacy { display: none; }
  .swatches { gap: 5px; }
  .swatch-hex { font-size: 8.5px; letter-spacing: 0; }
  .controls .btn { flex: 1 1 auto; }
  .stage-caption { flex-direction: column; gap: 2px; }
  .caption-right { text-align: left; }
  .row-label { min-width: 100%; padding-top: 0; }
  .footer { flex-direction: column; gap: 6px; }
}

@media (prefers-reduced-motion: reduce) {
  .chord-name, .chord-meta, .swatches li { transition-duration: 1ms !important; transform: none !important; }
  .btn, .chip { transition: none; }
}

/* Hover-only affordances are decoration; every control is a real button that
   also responds to tap and keyboard. */
@media (hover: none) {
  .btn:hover:not(:disabled) { background: transparent; color: var(--ink); }
  .btn-primary:hover:not(:disabled) { background: var(--ink); color: var(--ground); }
  .btn-quiet:hover:not(:disabled) { background: transparent; color: var(--muted); border-color: var(--hairline); }
  .chip:hover { border-color: var(--hairline); color: var(--muted); }
  .chip[aria-pressed="true"] { border-color: var(--ink); color: var(--ink); }
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

#feed { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; left: -9999px; }