* { box-sizing: border-box; }

:root {
  color-scheme: dark;
  font-family: "Space Grotesk", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --bg: #151516;
  --surface: #222428;
  --surface-2: #2b2e33;
  --inset: #1b1c20;
  --line: #383b41;
  --text: #f1f2f4;
  --muted: #9a9ea8;

  --don: #4db8ff;
  --ka: #f7879a;
  --turn: #ffcf5c;
  --primary: #087f8c;
  --danger: #b3374a;
}

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  line-height: 1.45;
  /* room for the fixed bottom bar */
  padding-bottom: calc(110px + env(safe-area-inset-bottom));
}

.app {
  width: min(880px, 100%);
  margin: 0 auto;
  padding: 24px 16px 0;
  padding-left: max(16px, env(safe-area-inset-left));
  padding-right: max(16px, env(safe-area-inset-right));
}

h1 { margin: 0 0 4px; font-size: 1.65rem; letter-spacing: -0.01em; }
h2 { margin: 0; font-size: 1.05rem; }
p { margin: 0; color: var(--muted); }
.top { margin-bottom: 18px; }

:focus-visible { outline: 2px solid var(--don); outline-offset: 2px; }

/* ---------- Cards ---------- */

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  margin-bottom: 16px;
}

.settings { display: grid; gap: 16px; }
.settings .card { margin-bottom: 0; display: grid; align-content: start; }
/* The gap only matters between the summary and its (real) content, so drop
   it entirely when closed — otherwise grid still reserves it as blank space
   below the header even though the content row collapses to 0 height. */
.settings .card[open] { gap: 18px; }
.settings + .fold { margin-top: 16px; }

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.hint { font-size: .82rem; color: var(--muted); }

.notice {
  background: #4a2530;
  border: 1px solid #8b3a4d;
  color: #ffd7de;
  padding: 12px 14px;
  border-radius: 12px;
  margin-bottom: 16px;
  font-size: .92rem;
}
.notice[hidden] { display: none; }

/* ---------- Pattern ---------- */

.legend { display: flex; gap: 6px; }

.chip {
  padding: 2px 10px;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 700;
  border: 1px solid;
}
.chip.don { color: #8fd0ff; border-color: var(--don); background: rgba(77,184,255,.16); }
.chip.ka  { color: #ffb0be; border-color: var(--ka);  background: rgba(247,135,154,.18); }

/* Every box is the same size whatever the settings; boxes just fill rows.
   JS sets --per-row so a row ends on a beat boundary whenever a whole beat fits. */
.pattern {
  --cell: 32px;
  --gap: 4px;
  display: grid;
  grid-template-columns: repeat(var(--per-row, 8), var(--cell));
  gap: var(--gap);
  justify-content: start;
  margin-top: 18px;
}

/* Cells are real <button> elements now (tap to edit), so reset button chrome. */
.step {
  position: relative;
  width: 100%;
  height: calc(var(--cell) * 1.4);
  margin: 0;
  border: 0;
  border-radius: 8px;
  background: #2d3036;
  border-bottom: 3px solid #3f434b;
  display: grid;
  place-items: center;
  font: inherit;
  font-size: .7rem;
  font-weight: 800;
  letter-spacing: .02em;
  color: #6f7480;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
.step:hover { filter: brightness(1.2); }
.step:active { filter: brightness(0.92); }
.step.rest { font-size: 1.1rem; font-weight: 700; }

/* First step of every beat: light bar on the left, brighter face, beat number */
.step.beat {
  background: #3a3e46;
  border-bottom-color: #c9ccd3;
  box-shadow: inset 4px 0 0 #fff;
  color: #aeb2bc;
}
.step.beat::before {
  content: attr(data-beat);
  position: absolute;
  top: 3px;
  left: 9px;
  font-size: .66rem;
  font-weight: 800;
  line-height: 1;
  color: #fff;
}
.step.beat.down::before { font-size: .8rem; }

.step.hit {
  background: rgba(77,184,255,.24);
  color: #9ad7ff;
  border-bottom-color: var(--don);
}
.step.accent {
  background: rgba(247,135,154,.26);
  color: #ffbcc8;
  border-bottom-color: var(--ka);
}

.step.current {
  outline: 2px solid #fff;
  outline-offset: 1px;
  filter: brightness(1.45);
  z-index: 1;
}

.hero .hint { margin-top: 12px; }

/* ---------- Sliders ---------- */

.slider-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 4px;
}
label { font-weight: 600; font-size: .95rem; }
.value { color: var(--text); font-variant-numeric: tabular-nums; font-weight: 700; }
.slider .hint { margin-top: -10px; }

/* Inside a <details> the sliders are laid out as plain flow (not grid items),
   so the gap between them has to come from margin, not the card's own gap. */
.slider + .slider { margin-top: 32px; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 36px;
  margin: 0;
  background: transparent;
  --fill: 50%;
  touch-action: pan-y;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(to right, #3fb6d9 var(--fill), var(--line) var(--fill));
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 26px;
  height: 26px;
  margin-top: -10px;
  border-radius: 50%;
  border: 0;
  background: #fff;
  box-shadow: 0 1px 5px rgba(0,0,0,.55);
}
input[type="range"]::-moz-range-track { height: 6px; border-radius: 3px; background: var(--line); }
input[type="range"]::-moz-range-progress { height: 6px; border-radius: 3px; background: #3fb6d9; }
input[type="range"]::-moz-range-thumb {
  width: 26px; height: 26px; border: 0; border-radius: 50%;
  background: #fff; box-shadow: 0 1px 5px rgba(0,0,0,.55);
}

.nudge-row {
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  align-items: center;
  gap: 6px;
}
.nudge {
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-2);
  color: var(--text);
  font-size: 1.35rem;
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}
.nudge:active { background: #3a3d44; }

/* ---------- Steppers and select ---------- */

.fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px 12px;
}
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field .hint { margin-top: -2px; }

.stepper {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) 46px;
  height: 48px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.stepper button {
  border: 0;
  background: transparent;
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}
.stepper button:active { background: #3a3d44; }
.stepper button:disabled { opacity: .3; cursor: default; }
.stepper input {
  width: 100%;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--text);
  text-align: center;
  font: inherit;
  font-size: 1.15rem;   /* 16px+ so iOS doesn't zoom on focus */
  font-weight: 700;
  -moz-appearance: textfield;
  appearance: textfield;
}
.stepper input::-webkit-outer-spin-button,
.stepper input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.stepper input:focus-visible { outline: none; }
.stepper:focus-within { border-color: var(--don); }
.stepper.locked { opacity: .6; }

select {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 48px;
  padding: 0 42px 0 14px;
  font: inherit;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  background-color: var(--surface-2);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%239a9ea8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
}
select:focus-visible { outline: none; border-color: var(--don); }
select option { background: #2b2e33; color: var(--text); }

/* ---------- Swing switch ---------- */

.toggle-row {
  display: grid;
  gap: 16px;
  margin-bottom: 16px;
}
.toggle-row .card { margin-bottom: 0; }

.switch-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  cursor: pointer;
  padding: 14px 16px;
  font-weight: normal;
  font-size: 1rem;
}
.switch-row.is-off { opacity: .6; }
.switch-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.switch-title { font-weight: 700; font-size: 1.05rem; }
.switch-row input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.switch-track {
  position: relative;
  flex: none;
  width: 54px;
  height: 32px;
  border-radius: 999px;
  background: #3a3d44;
  border: 1px solid #4a4e56;
  transition: background .15s;
}
.switch-track::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0,0,0,.5);
  transition: transform .15s;
}
.switch-row input:checked + .switch-track { background: var(--primary); border-color: #0aa0b0; }
.switch-row input:checked + .switch-track::after { transform: translateX(22px); }
.switch-row input:focus-visible + .switch-track { outline: 2px solid var(--don); outline-offset: 2px; }

/* Controls that swing mode doesn't use */
.slider.is-off { opacity: .45; }
.slider.is-off input { pointer-events: none; }

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 20px;
  border: 0;
  border-radius: 12px;
  font: inherit;
  font-weight: 700;
  color: #fff;
  background: var(--surface-2);
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}
.btn:hover { filter: brightness(1.12); }
.btn:active { filter: brightness(.95); }
.btn:disabled { opacity: .35; cursor: not-allowed; filter: none; }
.btn.primary { background: var(--primary); min-width: 108px; }
.btn.stop { background: var(--danger); min-width: 108px; }
.btn.ghost { background: var(--surface-2); border: 1px solid var(--line); }
.btn.small { min-height: 40px; padding: 0 14px; font-size: .9rem; }
#start:disabled, #stop:disabled { display: none; }

/* ---------- Sounds / details ---------- */

.fold { padding: 0 16px; }
.fold > summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  min-height: 52px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}
/* The title grows to fill the row, so anything after it (like the Hit/Accent
   legend) sits flush against the collapse chevron on the right instead of
   right next to the title. */
.fold > summary > h2 { flex: 1; }
.fold > summary::-webkit-details-marker { display: none; }
.fold > summary::after {
  content: "";
  width: 9px; height: 9px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  margin-right: 4px;
}
.fold[open] > summary::after { transform: rotate(-135deg); }
.fold[open] { padding-bottom: 16px; }
.fold > p { margin-top: 2px; }
.fold > p.more { margin-top: 10px; }

.sound-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 12px;
  margin-top: 14px;
}
.sound-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px;
  background: var(--inset);
  border: 1px solid #33363c;
  border-radius: 12px;
}
.sound-card span { color: var(--muted); font-size: .82rem; overflow-wrap: anywhere; }
.sound-actions { display: flex; gap: 8px; margin-top: 8px; }
.file { position: relative; }
.file input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
}
.file:focus-within { outline: 2px solid var(--don); outline-offset: 2px; }

/* ---------- Bottom bar ---------- */

.dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  background: rgba(23, 24, 27, .98);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line);
  padding: 10px max(16px, env(safe-area-inset-right)) calc(10px + env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
}
.dock-inner {
  max-width: 848px;   /* matches the page column (880px minus its 16px padding) */
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.now { flex: 1; min-width: 0; display: flex; align-items: center; gap: 12px; }
.now-text { min-width: 0; }

.dot {
  flex: none;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: #6b6f79;
}
.dock[data-phase="count"]  .dot { background: #fff;        box-shadow: 0 0 0 4px rgba(255,255,255,.18); }
.dock[data-phase="listen"] .dot { background: var(--don);  box-shadow: 0 0 0 4px rgba(77,184,255,.25); }
.dock[data-phase="turn"]   .dot { background: var(--turn); box-shadow: 0 0 0 4px rgba(255,207,92,.28); }
.dock[data-phase="error"]  .dot { background: #ff6b81; }

#status {
  font-weight: 800;
  font-size: 1.1rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.dock[data-phase="turn"] #status { color: var(--turn); }
.dock[data-phase="error"] #status { color: #ff9fae; }

#count {
  color: var(--muted);
  font-size: .82rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------- Small screens ---------- */

@media (max-width: 519px) {
  #generate, #previous { padding: 0; width: 48px; }
  #generate span, #previous span { display: none; }
  .btn.primary, .btn.stop { min-width: 96px; padding: 0 16px; }
}

@media (min-width: 600px) {
  .pattern { --cell: 40px; }
  .step { font-size: .78rem; }
}

@media (min-width: 820px) {
  .pattern { --cell: 46px; }
  .app { padding-top: 40px; }
  h1 { font-size: 2rem; }
  .settings { grid-template-columns: 1fr 1fr; align-items: start; }
  .toggle-row { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}