/* baukasten — tool chrome. Monochrome UI so the artwork carries the color.
   Mobile-first; desktop (≥768px) docks the preview beside the editor. */

html, body {
  height: 100%;
}

body {
  padding: 0;
  overflow: hidden;
  overscroll-behavior: none;
  font-size: 0.9rem;
}

#app {
  display: grid;
  grid-template-rows: auto minmax(0, 38vh) minmax(0, 1fr) auto;
  grid-template-areas: 'top' 'preview' 'editor' 'tabs';
  height: 100dvh;
}

/* --- topbar --- */

#topbar {
  grid-area: top;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.6rem;
  border-bottom: 1px solid var(--border);
}

.brand {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.06em;
  margin-right: 0.4rem;
}

.spacer { flex: 1; }

#timecode {
  font-family: var(--font-mono);
  color: var(--muted);
  min-width: 4ch;
}

button {
  font: inherit;
  color: var(--fg);
  background: none;
  border: 1px solid var(--border);
  padding: 0.35rem 0.6rem;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  touch-action: manipulation;
}

button:hover { border-color: var(--fg); }

.icon-btn {
  min-width: 2.2rem;
  text-align: center;
}

.ghost-btn.wide { width: 100%; margin-top: 0.3rem; }
.ghost-btn.danger, .mini.danger, .chip.danger { color: oklch(60% 0.19 25); }

/* --- preview --- */

#preview-wrap {
  grid-area: preview;
  position: relative;
  background: oklch(12% 0 0);
  min-height: 0;
}

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

#transport {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 0 0.4rem;
  opacity: 0.85;
}

#scrub {
  width: 100%;
  margin: 0;
  accent-color: oklch(85% 0 0);
}

/* --- editor --- */

#editor {
  grid-area: editor;
  overflow-y: auto;
  padding: 0.6rem 0.6rem 6rem;
  -webkit-overflow-scrolling: touch;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  margin-bottom: 0.6rem;
}

.chip {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.3rem 0.55rem;
  color: var(--muted);
}

.chip.active {
  color: var(--bg);
  background: var(--fg);
  border-color: var(--fg);
}

.chip.add { color: var(--fg); }

/* op cards */

.op-list { display: flex; flex-direction: column; }

.op-card {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.6rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--muted);
  cursor: pointer;
  background: var(--bg);
}

.op-card.cat-generate { border-left-color: oklch(55% var(--primary-c) var(--primary-h)); }
.op-card.cat-filter { border-left-color: oklch(70% var(--primary-c) var(--primary-h)); }
.op-card.cat-combine { border-left-color: oklch(40% var(--primary-c) var(--primary-h)); }
.op-card.cat-scene, .op-card.cat-post { border-left-color: oklch(62% var(--primary-c) var(--primary-h)); }

.op-card.selected {
  background: var(--fg);
  color: var(--bg);
}

.op-card.off { opacity: 0.45; }

.op-name {
  font-family: var(--font-mono);
  font-weight: 650;
}

.op-summary {
  flex: 1;
  color: var(--muted);
  font-size: 0.78rem;
  font-family: var(--font-mono);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.op-card.selected .op-summary { color: var(--bg); opacity: 0.7; }

.op-actions { display: flex; gap: 0.2rem; }

.mini {
  padding: 0.25rem 0.45rem;
  font-size: 0.75rem;
  line-height: 1;
}

.op-card.selected .mini { color: var(--bg); border-color: var(--bg); }

.op-flow {
  text-align: center;
  color: var(--border);
  font-size: 0.7rem;
  line-height: 1.1;
  user-select: none;
}

.add-op {
  margin-top: 0.2rem;
  width: 100%;
  padding: 0.6rem;
  border-style: dashed;
  color: var(--muted);
}

.hint {
  color: var(--muted);
  font-size: 0.78rem;
  margin-top: 0.8rem;
}

.section-h {
  margin: 1rem 0 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* --- bottom sheet (params) --- */

#sheet {
  position: fixed;
  left: 0; right: 0;
  bottom: calc(3.1rem + env(safe-area-inset-bottom));
  max-height: 46vh;
  overflow-y: auto;
  background: var(--bg);
  border-top: 2px solid var(--fg);
  padding: 0.5rem 0.75rem 0.9rem;
  z-index: 30;
  box-shadow: 0 -8px 24px oklch(0% 0 0 / 0.25);
}

#sheet.hidden, #overlay.hidden { display: none; }

.sheet-head {
  display: flex;
  align-items: center;
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
}

.param { margin: 0.45rem 0; position: relative; }

.param label {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--muted);
  font-family: var(--font-mono);
}

.param .val { color: var(--fg); }

.param input[type='range'] {
  width: 100%;
  accent-color: var(--primary);
  height: 1.6rem;
}

.param input[type='text'],
.param input[type='number'],
.param select {
  width: 100%;
  font: inherit;
  font-family: var(--font-mono);
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.4rem;
}

.param .expr-input.invalid { border-color: oklch(60% 0.19 25); }

.param .fx {
  position: absolute;
  right: 0;
  top: -0.15rem;
}

.param .fx.active { background: var(--fg); color: var(--bg); }

.param.inline {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.param.inline label { flex: 0 0 auto; }
.param.inline input, .param.inline select { width: auto; flex: 1; }

.seg { display: flex; flex-wrap: wrap; gap: 0.25rem; margin-top: 0.25rem; }

.seg-btn {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  padding: 0.3rem 0.5rem;
}

.seg-btn.active {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}

/* palette control */

.pal-strip {
  width: 100%;
  height: 24px;
  display: block;
  border: 1px solid var(--border);
  margin: 0.3rem 0;
}

.pal-detail summary {
  font-size: 0.75rem;
  color: var(--muted);
  cursor: pointer;
  font-family: var(--font-mono);
}

.pal-band {
  display: flex;
  gap: 0.4rem;
  align-items: center;
}

.pal-band-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted);
  width: 1ch;
}

.pal-band input { flex: 1; accent-color: var(--primary); }

/* --- overlay / picker / menu --- */

#overlay {
  position: fixed;
  inset: 0;
  background: oklch(0% 0 0 / 0.55);
  z-index: 50;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.picker {
  background: var(--bg);
  border-top: 2px solid var(--fg);
  width: 100%;
  max-width: 32rem;
  max-height: 80vh;
  overflow-y: auto;
  padding: 0.8rem 0.9rem 1.2rem;
}

.picker h3 { margin: 0 0 0.5rem; font-family: var(--font-mono); }
.picker h4 {
  margin: 0.7rem 0 0.3rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.picker-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(6.5rem, 1fr));
  gap: 0.3rem;
}

.pick {
  font-family: var(--font-mono);
  padding: 0.55rem 0.3rem;
  border-left: 3px solid var(--muted);
}

.pick.cat-generate { border-left-color: oklch(55% var(--primary-c) var(--primary-h)); }
.pick.cat-filter { border-left-color: oklch(70% var(--primary-c) var(--primary-h)); }
.pick.cat-combine { border-left-color: oklch(40% var(--primary-c) var(--primary-h)); }

.menu-list { display: flex; flex-direction: column; gap: 0.3rem; }

/* --- tabbar --- */

#tabbar {
  grid-area: tabs;
  display: flex;
  border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--bg);
  z-index: 40;
}

.tab {
  flex: 1;
  border: none;
  border-top: 2px solid transparent;
  padding: 0.7rem 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.tab.active {
  color: var(--fg);
  border-top-color: var(--fg);
  font-weight: 700;
}

/* --- music page --- */

.music-grid {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  overflow-x: auto;
  padding-bottom: 0.3rem;
}

.music-row {
  display: flex;
  gap: 0.15rem;
  align-items: stretch;
}

.inst-label {
  flex: 0 0 3.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.3rem 0.2rem;
  border: none;
  text-align: left;
  color: var(--fg);
}

.inst-label.muted { color: var(--muted); text-decoration: line-through; }

.cell {
  flex: 1 0 1.3rem;
  min-width: 1.3rem;
  height: 2rem;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  border: 1px solid var(--border);
  color: var(--bg);
}

.cell.beat { border-left: 2px solid var(--muted); }

.cell.on {
  background: var(--fg);
  border-color: var(--fg);
}

.cell.on.open { background: var(--primary); border-color: var(--primary); }
.cell.hold { background: oklch(from var(--fg) l 0 0 / 0.35); color: var(--fg); }

.music-tools {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  margin-top: 0.6rem;
}

.tool-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.3rem;
}

.mix {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 1rem;
}

.song-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
}

.song-cell {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  padding: 0.3rem 0.15rem;
  max-width: 7rem;
}

/* --- seq page --- */

.seq-globals { display: flex; gap: 1.2rem; flex-wrap: wrap; margin-bottom: 0.6rem; }

.timeline-strip {
  position: relative;
  height: 2.4rem;
  border: 1px solid var(--border);
  margin-bottom: 0.7rem;
  overflow: hidden;
}

.strip-shot {
  position: absolute;
  top: 0; bottom: 0;
  border-right: 1px solid var(--bg);
  background: oklch(from var(--fg) l 0 0 / 0.12);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.2rem 0.3rem;
  overflow: hidden;
  white-space: nowrap;
  cursor: pointer;
}

.strip-shot:hover { background: oklch(from var(--fg) l 0 0 / 0.25); }

#strip-playhead {
  position: absolute;
  top: 0; bottom: 0;
  width: 2px;
  background: var(--primary);
  pointer-events: none;
}

.shot-list { display: flex; flex-direction: column; gap: 0.4rem; }

.shot-card {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  border: 1px solid var(--border);
  padding: 0.45rem 0.6rem;
}

.shot-n { font-family: var(--font-mono); color: var(--muted); }

.shot-card .param.inline { margin: 0; }
.shot-card input[type='number'] { width: 4.2rem; }

/* --- demo mode --- */

body.demo #topbar,
body.demo #editor,
body.demo #tabbar,
body.demo #sheet,
body.demo #transport {
  display: none;
}

body.demo #app {
  grid-template-rows: 1fr;
  grid-template-areas: 'preview';
}

body.demo #preview-wrap {
  position: fixed;
  inset: 0;
}

.boot-error {
  position: fixed;
  inset: auto 0 0 0;
  margin: 0;
  padding: 1rem;
  background: oklch(30% 0.09 25);
  color: oklch(95% 0 0);
  font-size: 0.75rem;
  white-space: pre-wrap;
  z-index: 99;
}

/* --- desktop --- */

@media (min-width: 768px) {
  #app {
    grid-template-columns: minmax(24rem, 30rem) 1fr;
    grid-template-rows: auto minmax(0, 1fr) auto;
    grid-template-areas:
      'top top'
      'editor preview'
      'tabs preview';
  }

  #preview-wrap { border-left: 1px solid var(--border); }

  #editor { padding-bottom: 2rem; }

  #sheet {
    left: 0;
    right: auto;
    width: min(30rem, 100%);
    bottom: 3.1rem;
    border-right: 1px solid var(--border);
  }
}