/* Drum Machine - dark theme, mobile first.
   Phones (< 760px): two-line track rows, one page of 8 steps at a time.
   Tablets (760-1149px): two-line track rows with all 16 steps.
   Desktop (>= 1150px): one line per track. */

:root {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --raised: #273449;
  --raised-hover: #31405a;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #facc15;
  --accent-ink: #0f172a;
  --danger: #f87171;
  --border: rgba(148, 163, 184, 0.18);
  --track: #334155;
  --pad-off: #243146;
  --pad-border: rgba(148, 163, 184, 0.2);
  --radius: 12px;
  --radius-small: 8px;
  --shadow: 0 4px 16px rgba(2, 6, 23, 0.35);
  --fast: 150ms;
  --medium: 220ms;
  --pad-gap: 2px;
  --beat-gap: 4px;
  --pad-height: 40px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 15px;
  line-height: 1.4;
}

button,
input,
select {
  font: inherit;
  color: inherit;
}

h1,
h2,
p {
  margin: 0;
}

::selection {
  background: rgba(250, 204, 21, 0.35);
}

.app {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 1240px;
  margin: 0 auto;
  padding: 10px 6px 16px;
}

.main {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 10px 8px;
  min-width: 0;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-width: 40px;
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--raised);
  color: var(--text);
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: background-color var(--fast), border-color var(--fast), color var(--fast), transform var(--fast),
    opacity var(--fast);
}

.btn:active {
  transform: scale(0.97);
}

.btn:focus-visible,
.number:focus-visible,
:where(input[type="range"]):focus-visible,
.source:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.btn-small {
  padding: 0 8px;
  font-size: 0.8rem;
}

.btn-icon {
  padding: 0;
  width: 40px;
}

.icon {
  width: 18px;
  height: 18px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.icon .dot,
.icon-play,
.icon-stop {
  fill: currentColor;
  stroke: none;
}

@media (hover: hover) {
  .btn:hover:not(:disabled):not([aria-pressed="true"]) {
    background: var(--raised-hover);
  }

  .btn-play:hover,
  .btn[aria-pressed="true"]:hover {
    filter: brightness(1.08);
  }
}

/* ---------- Header and footer ---------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.logo {
  width: 36px;
  height: 36px;
  flex: none;
}

.brand-text {
  min-width: 0;
}

h1 {
  font-size: 1.15rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.tagline {
  color: var(--muted);
  font-size: 0.78rem;
}

.topbar-actions {
  display: flex;
  gap: 8px;
  flex: none;
}

.btn-lang {
  min-width: 48px;
  letter-spacing: 0.04em;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 4px 16px;
  padding: 0 4px;
  color: var(--muted);
  font-size: 0.8rem;
}

.hints-touch {
  display: none;
}

.source {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-small);
}

.source:hover {
  text-decoration: underline;
}

/* ---------- Transport ---------- */

.transport {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 12px;
}

.btn-play {
  order: -2;
  min-width: 120px;
  min-height: 48px;
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  font-size: 1rem;
  font-weight: 700;
}

.btn-play .icon {
  width: 20px;
  height: 20px;
}

.btn-play .icon-stop,
.btn-play.is-playing .icon-play {
  display: none;
}

.btn-play.is-playing .icon-stop {
  display: block;
}

.control {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) auto;
  align-items: center;
  gap: 8px;
  flex: 1 1 100%;
  min-width: 0;
}

.control label {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
}

.readout {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.number {
  width: 3.6em;
  min-height: 40px;
  padding: 0 4px;
  border: 1px solid var(--border);
  border-radius: var(--radius-small);
  background: var(--bg);
  text-align: center;
  font-variant-numeric: tabular-nums;
  -moz-appearance: textfield;
  appearance: textfield;
}

.number::-webkit-inner-spin-button,
.number::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.unit {
  min-width: 2.2em;
  color: var(--muted);
  font-size: 0.78rem;
}

.patterns {
  order: -1;
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.patterns-label {
  display: none;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
  margin-right: 2px;
}

.pattern-btn {
  position: relative;
  width: 44px;
  padding: 0;
  font-weight: 800;
}

.pattern-btn.has-notes::after {
  content: "";
  position: absolute;
  bottom: 5px;
  left: 50%;
  width: 4px;
  height: 4px;
  margin-left: -2px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.75;
}

.pattern-btn.is-playing,
.chain-chip.is-playing {
  box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--accent);
}

/* ---------- Range sliders ---------- */

:where(input[type="range"]) {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  min-width: 0;
  height: 40px;
  margin: 0;
  background: transparent;
  border-radius: var(--radius-small);
  cursor: pointer;
  touch-action: manipulation;
}

:where(input[type="range"])::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(to right, var(--accent) var(--fill, 0%), var(--track) var(--fill, 0%));
}

:where(input[type="range"])::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  margin-top: -7px;
  border: 3px solid var(--accent);
  border-radius: 50%;
  background: var(--text);
  transition: transform var(--fast);
}

:where(input[type="range"]):active::-webkit-slider-thumb {
  transform: scale(1.15);
}

:where(input[type="range"])::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: var(--track);
}

:where(input[type="range"])::-moz-range-progress {
  height: 6px;
  border-radius: 999px;
  background: var(--accent);
}

:where(input[type="range"])::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border: 3px solid var(--accent);
  border-radius: 50%;
  background: var(--text);
}

/* ---------- Sequencer ---------- */

.sequencer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.seq-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex: 1 1 auto;
}

h2 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
}

.badge {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: var(--radius-small);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 800;
}

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

.pager-btn {
  min-width: 64px;
  font-variant-numeric: tabular-nums;
}

.pager-btn.has-playhead {
  box-shadow: inset 0 -3px 0 var(--accent);
}

.pager-btn[aria-pressed="true"].has-playhead {
  box-shadow: inset 0 -3px 0 var(--accent-ink);
}

.tools {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  flex: 1 1 100%;
}

.select {
  -webkit-appearance: none;
  appearance: none;
  justify-content: flex-start;
  min-width: 0;
  padding: 0 32px 0 12px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' 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 10px center;
  background-size: 14px;
  text-overflow: ellipsis;
  cursor: pointer;
}

.select option {
  background: var(--surface);
  color: var(--text);
}

/* ---------- Step grid ---------- */

.grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1 1 100%;
  min-width: 0;
}

.grid-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas:
    "head mix"
    "steps steps";
  align-items: center;
  gap: 6px 8px;
  min-width: 0;
}

.grid-numbers {
  grid-template-areas: "steps steps";
}

.grid-numbers .cell-head,
.grid-numbers .cell-mix {
  display: none;
}

.track {
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.cell-head {
  grid-area: head;
  min-width: 0;
}

.cell-mix {
  grid-area: mix;
  display: flex;
  align-items: center;
  gap: 4px;
}

.steps {
  grid-area: steps;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--beat-gap);
  min-width: 0;
}

.beat {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--pad-gap);
}

.beat:nth-child(even) {
  --pad-off: #2c3a52;
}

.num {
  display: grid;
  place-items: center;
  height: 20px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
}

.num.is-beat {
  color: var(--text);
  font-weight: 700;
}

.num.is-playhead {
  background: var(--accent);
  color: var(--accent-ink);
}

.grid.is-elsewhere .num.is-playhead {
  background: var(--muted);
}

.preview {
  justify-content: flex-start;
  width: 100%;
  min-width: 0;
  gap: 8px;
  padding: 0 10px;
}

.track-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.preview-icon {
  width: 16px;
  height: 16px;
  margin-left: auto;
  color: var(--muted);
  transition: color var(--fast);
}

.preview.is-hit .preview-icon,
.preview:active .preview-icon {
  color: var(--accent);
}

.led {
  width: 10px;
  height: 10px;
  flex: none;
  border-radius: 50%;
  background: var(--track);
  transition: background-color 60ms, box-shadow 60ms;
}

.led.is-lit,
.preview.is-hit .led,
.preview:active .led {
  background: var(--accent);
  box-shadow: 0 0 8px rgba(250, 204, 21, 0.8);
}

.preview.is-hit {
  background: var(--raised-hover);
}

.mute[aria-pressed="true"] {
  background: var(--danger);
  border-color: var(--danger);
  color: var(--accent-ink);
}

.volume {
  width: 84px;
}

.volume::-webkit-slider-thumb {
  width: 16px;
  height: 16px;
  margin-top: -5px;
}

.track.is-silent .steps,
.track.is-silent .track-name,
.track.is-silent .volume {
  opacity: 0.4;
}

.pad {
  position: relative;
  height: var(--pad-height);
  min-width: 0;
  padding: 0;
  border: 1px solid var(--pad-border);
  border-radius: var(--radius-small);
  background: var(--pad-off);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
  transition: background-color var(--fast), border-color var(--fast), transform var(--fast);
}

.pad::after {
  content: "";
  position: absolute;
  left: 5px;
  bottom: 5px;
  width: 0;
  height: 3px;
  border-radius: 2px;
  background: var(--accent-ink);
  opacity: 0.6;
  transition: width var(--fast);
}

.pad[data-v="1"] {
  background: rgba(250, 204, 21, 0.38);
  border-color: rgba(250, 204, 21, 0.5);
}

.pad[data-v="1"]::after {
  width: 26%;
}

.pad[data-v="2"] {
  background: rgba(250, 204, 21, 0.7);
  border-color: rgba(250, 204, 21, 0.8);
}

.pad[data-v="2"]::after {
  width: 50%;
}

.pad[data-v="3"] {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 10px rgba(250, 204, 21, 0.35);
}

.pad[data-v="3"]::after {
  width: calc(100% - 10px);
}

.pad:active {
  transform: scale(0.93);
}

.pad:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 1px;
  z-index: 1;
}

.pad.is-playhead {
  box-shadow: inset 0 0 0 2px rgba(241, 245, 249, 0.9);
}

.pad[data-v="0"].is-playhead {
  background: #3b4b66;
}

.pad[data-v="3"].is-playhead {
  box-shadow: inset 0 0 0 2px #ffffff, 0 0 16px rgba(250, 204, 21, 0.65);
}

.grid.is-elsewhere .pad.is-playhead {
  box-shadow: inset 0 0 0 2px rgba(148, 163, 184, 0.5);
}

@media (hover: hover) {
  .pad[data-v="0"]:hover {
    background: var(--raised-hover);
  }
}

/* ---------- Song chain ---------- */

.chain-panel {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
}

.chain-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex: 1 1 auto;
}

.chain-count {
  color: var(--muted);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
}

.chain-body {
  flex: 1 1 100%;
  min-width: 0;
}

.chain-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  transition: opacity var(--medium);
}

.chain-panel.is-off .chain-list {
  opacity: 0.6;
}

.chain-chip {
  width: 40px;
  padding: 0;
  font-weight: 800;
}

.chain-empty {
  color: var(--muted);
  font-size: 0.85rem;
}

.chain-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chain-add {
  min-width: 48px;
  padding: 0 8px;
}

/* ---------- Toast ---------- */

.toast {
  position: fixed;
  left: 50%;
  bottom: 16px;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: calc(100vw - 32px);
  min-height: 48px;
  padding: 4px 6px 4px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #334155;
  color: var(--text);
  box-shadow: 0 10px 30px rgba(2, 6, 23, 0.55);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 12px);
  transition: opacity var(--medium), transform var(--medium);
}

.toast.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translate(-50%, 0);
}

.toast-text {
  min-width: 0;
}

.toast-action {
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid rgba(250, 204, 21, 0.45);
  border-radius: var(--radius-small);
  background: transparent;
  color: var(--accent);
  font-weight: 700;
  cursor: pointer;
  touch-action: manipulation;
}

.toast-action:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* ---------- Phones: one page of 8 steps ---------- */

@media (max-width: 759.98px) {
  .sequencer {
    padding-left: 4px;
    padding-right: 4px;
  }

  .seq-head,
  .tools {
    padding: 0 4px;
  }

  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid[data-page="0"] .beat:nth-child(n + 3),
  .grid[data-page="1"] .beat:nth-child(-n + 2) {
    display: none;
  }
}

@media (max-width: 479.98px) {
  .tagline {
    display: none;
  }
}

@media (hover: none) and (pointer: coarse) {
  .hints {
    display: none;
  }

  /* Touch screens get their own hint: taps and long presses instead of keys and right-click. */
  .hints.hints-touch {
    display: block;
  }
}

/* ---------- Tablets ---------- */

@media (min-width: 760px) {
  :root {
    --pad-gap: 3px;
    --beat-gap: 6px;
  }

  .app {
    gap: 14px;
    padding: 16px;
  }

  .main {
    gap: 14px;
  }

  .panel {
    padding: 12px 14px;
  }

  .logo {
    width: 40px;
    height: 40px;
  }

  h1 {
    font-size: 1.3rem;
  }

  .pager {
    display: none;
  }

  .tools {
    display: flex;
    flex-wrap: wrap;
    flex: 0 1 auto;
  }

  .select {
    width: 190px;
  }

  .control {
    flex: 1 1 260px;
    grid-template-columns: auto minmax(0, 1fr) auto;
  }

  .patterns-label {
    display: inline;
  }

  .volume {
    width: 140px;
  }

  .chain-body {
    flex: 1 1 260px;
  }
}

/* ---------- Desktop: one line per track ---------- */

@media (min-width: 1150px) {
  :root {
    --pad-gap: 4px;
    --beat-gap: 8px;
    --pad-height: 42px;
  }

  .btn-play {
    order: 0;
  }

  .patterns {
    order: 0;
  }

  .control {
    flex: 1 1 220px;
  }

  .grid {
    gap: 6px;
  }

  .grid-row,
  .grid-numbers {
    grid-template-columns: 140px 200px minmax(0, 1fr);
    grid-template-areas: "head mix steps";
    gap: 8px;
  }

  .grid-numbers .cell-head,
  .grid-numbers .cell-mix {
    display: block;
  }

  .track {
    padding-top: 0;
    border-top: 0;
  }

  .volume {
    flex: 1 1 0;
    min-width: 56px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }

  .btn:active,
  .pad:active {
    transform: none;
  }
}