@import url('https://fonts.googleapis.com/css2?family=Noto+Music&display=swap');

body { margin: 0; }
#paper-studio {
  color-scheme: light dark;
  --paper: light-dark(#f3ece0, #26221d);
  --ink: light-dark(#252a23, #f6eee0);
  --muted: light-dark(#545744, #c9baa2);
  --rule: light-dark(#aa9d87, #776954);
  --staff: light-dark(#736d5e, #aca18d);
  --green: light-dark(#36573d, #c4dbad);
  --on-green: light-dark(#fffdf6, #212719);
  --wash: light-dark(#e4e8da, #39432f);
  --error: light-dark(#8a3c31, #ffc3b5);
  background: var(--paper);
  color: var(--ink);
  font: 400 16px/1.45 -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  min-height: 100vh;
  padding: 0 max(clamp(18px, 6vw, 56px), calc((100% - 880px) / 2));
}
#paper-studio *, #paper-studio *::before { box-sizing: border-box; }
#paper-studio [hidden] { display: none !important; }
#paper-studio .ps-header, #paper-studio .ps-question {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}
#paper-studio .ps-header {
  padding-block: 17px 15px;
  border-bottom: 1px solid var(--rule);
  color: var(--green);
  font-size: 18px;
  font-weight: 600;
}
#paper-studio h1 { margin: 0; font: inherit; }
#paper-studio .ps-exercise {
  max-width: 472px;
  margin-inline: auto;
  padding-block: 30px 18px;
}
#paper-studio .ps-home { padding-block: 32px 36px; }
#paper-studio .ps-home h2 { margin-bottom: 16px; }
#paper-studio .ps-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
#paper-studio .ps-cards button {
  display: grid;
  align-content: start;
  gap: 7px;
  padding: 16px;
  text-align: left;
  line-height: 1.35;
}
#paper-studio .ps-card-name { font-size: 18px; color: var(--green); }
#paper-studio .ps-card-detail { color: var(--muted); font-weight: 400; }
#paper-studio .ps-setup { margin-bottom: 18px; }
#paper-studio .ps-audio, #paper-studio .ps-result-actions { display: flex; flex-wrap: wrap; gap: 8px; }
#paper-studio .ps-audio { margin-block: 26px; }
#paper-studio .ps-lesson-text { margin: 0 0 16px; }
#paper-studio .ps-lesson .ps-prev:disabled { opacity: .55; }
#paper-studio .ps-melody-notes .ps-note, #paper-studio .ps-melody-notes .ps-ledger { left: var(--x); }
#paper-studio .ps-staff .ps-melody-notes .ps-note { color: var(--ink); opacity: .64; }
#paper-studio .ps-staff .ps-melody-notes .ps-note[data-active] { opacity: 1; color: var(--green); }
#paper-studio .ps-melody-notes .ps-note[data-active]::before { box-shadow: 0 0 0 4px var(--wash); }
#paper-studio .ps-staff:has(.ps-melody-notes:not([hidden])) .ps-position { display: none; }
#paper-studio .ps-exercise:has(.ps-round:not([hidden])) .ps-results { margin-top: 12px; }
#paper-studio .ps-exercise:has(.ps-round:not([hidden])) .ps-result { margin-top: 0; }
#paper-studio .ps-audio button, #paper-studio .ps-result-actions button { padding-inline: 12px; }
#paper-studio .ps-summary { margin: 0 0 16px; color: var(--muted); }
#paper-studio h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(21px, 4.3vw, 27px);
  font-weight: 600;
  line-height: 1.2;
}
#paper-studio .ps-modes {
  display: flex;
  gap: 14px;
  margin: 0 0 18px;
  padding: 0;
  border: 0;
}
#paper-studio .ps-modes legend { padding: 0; color: var(--muted); font-size: 14px; }
#paper-studio .ps-setup .ps-modes { margin: 12px 0 8px; }
#paper-studio .ps-modes label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  min-height: 44px;
}
#paper-studio .ps-modes input { margin: 0; accent-color: var(--green); }
#paper-studio .ps-modes label:has(:checked) { color: var(--green); font-weight: 600; }
#paper-studio .ps-progress {
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
#paper-studio .ps-staff {
  position: relative;
  height: 142px;
  margin-block: 9px 6px;
}
#paper-studio .ps-line {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(33px + var(--line) * 15px);
  height: 1px;
  background: var(--staff);
}
#paper-studio .ps-clef {
  position: absolute;
  left: 8px;
  top: 40px;
  font: 52px/1 'Noto Music', 'Apple Symbols', serif;
}
#paper-studio .ps-staff[data-clef="bass"] .ps-clef { top: 29px; }
#paper-studio .ps-ledger {
  position: absolute;
  top: calc(33px + var(--step) * 7.5px);
  left: 57%;
  width: 34px;
  height: 1px;
  background: var(--staff);
  transform: translateX(-50%);
}
#paper-studio .ps-note, #paper-studio .ps-landmark {
  position: absolute;
  top: calc(33px + var(--step, 6) * 7.5px);
  left: 57%;
  width: 19px;
  height: 12px;
  transform: translate(-50%, -50%);
}
#paper-studio .ps-note::before, #paper-studio .ps-landmark::before {
  content: '';
  display: block;
  height: 100%;
  border-radius: 50%;
  background: currentColor;
  transform: rotate(-20deg);
}
#paper-studio .ps-note::after, #paper-studio .ps-landmark::after {
  content: '';
  position: absolute;
  right: 0;
  bottom: 50%;
  width: 1.6px;
  height: 33px;
  background: currentColor;
}
#paper-studio .ps-note[data-down]::after, #paper-studio .ps-landmark[data-down]::after {
  inset: 50% auto auto 0;
}
#paper-studio .ps-landmark {
  left: 32%;
  --step: var(--reference-step);
  color: var(--green);
}
#paper-studio .ps-landmark::before {
  background: var(--paper);
  border: 1.5px solid currentColor;
}
#paper-studio .ps-landmark span {
  position: absolute;
  top: 30px;
  left: 50%;
  transform: translateX(-50%);
  font-weight: 600;
}
#paper-studio .ps-position {
  position: absolute;
  inset-inline: 46% 23%;
  top: calc(20px + var(--step, 6) * 7.5px);
  height: 26px;
  background: var(--wash);
  opacity: 0;
}
#paper-studio .ps-staff[data-correct] .ps-position {
  opacity: 1;
  animation: ps-mark .22s ease-out both;
  transform-origin: left;
}
#paper-studio .ps-staff[data-correct] .ps-note { color: var(--green); }
#paper-studio .ps-staff[data-next] .ps-note { animation: ps-ink .18s ease-out both; }
@keyframes ps-mark { from { opacity: .3; scale: .8 1; } to { opacity: 1; scale: 1; } }
@keyframes ps-ink { from { opacity: .25; } to { opacity: 1; } }
#paper-studio .ps-answers {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: clamp(5px, 1vw, 10px);
}
#paper-studio button {
  font: inherit;
  font-weight: 600;
  line-height: 1;
  min-height: 44px;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: transparent;
  color: var(--ink);
}
#paper-studio button:focus-visible { outline: 2px solid var(--green); outline-offset: 3px; }
#paper-studio button:enabled:hover { background: var(--wash); }
#paper-studio .ps-answers button {
  font-size: 21px;
  padding: 0;
}
#paper-studio .ps-answers button:disabled { opacity: 1; color: var(--muted); }
#paper-studio .ps-answers .ps-right:disabled, #paper-studio .ps-primary, #paper-studio .ps-next {
  color: var(--on-green);
  background: var(--green);
  border-color: var(--green);
}
#paper-studio .ps-answers .ps-wrong { border-color: var(--error); color: var(--error); }
#paper-studio .ps-primary:enabled:hover, #paper-studio .ps-next:enabled:hover { background: color-mix(in srgb, var(--green) 88%, var(--ink)); }
#paper-studio .ps-primary, #paper-studio .ps-next { padding-inline: 12px; white-space: nowrap; }
#paper-studio .ps-support {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px 12px;
  min-height: 49px;
  margin-top: 8px;
}
#paper-studio .ps-hint, #paper-studio .ps-back {
  color: var(--green);
  border-color: transparent;
  padding: 0 4px;
  text-decoration: underline;
  text-underline-offset: .18em;
  white-space: nowrap;
}
#paper-studio .ps-header:has(.ps-back:not([hidden])) { padding-block: 8px 4px; align-items: center; }
#paper-studio .ps-status, #paper-studio .ps-clue { margin: 0; font-size: 15px; }
#paper-studio .ps-status[data-kind="wrong"] { color: var(--error); }
#paper-studio .ps-status[data-kind="right"] { color: var(--green); }
#paper-studio .ps-clue { color: var(--muted); padding: 0 4px 9px; }
#paper-studio .ps-result { margin-block: 35px 10px; }
@media (max-width: 565px) {
  #paper-studio .ps-cards { grid-template-columns: 1fr; }
  #paper-studio .ps-cards button { gap: 4px; padding: 12px 14px; }
}
@media (max-width: 400px) {
  #paper-studio .ps-exercise { padding-top: 24px; }
  #paper-studio .ps-support { flex-wrap: wrap; }
}
@media (prefers-reduced-motion: reduce) {
  #paper-studio .ps-staff *, #paper-studio .ps-staff *::before { animation: none !important; }
}