/* Poly-Drum — CONSOLE theme (Prompt 11).
 *
 * A modern dark-DAW session look: cool near-black neutrals, flat precise panels,
 * mono digits for every value, and one signature system — each drum role owns a
 * hue (set as --hue per track row in src/ui/tracks.js) that colors the row's
 * channel edge, name, fader, and hits. Amber marks anything "engaged" (mute,
 * humanize, bypass, clip); green is play; blue is the neutral UI pointer/focus.
 */

:root {
  --bg: #0d0f12;        /* page */
  --panel: #14171c;     /* transport / master / dialogs */
  --panel-2: #171b20;   /* track channel rows */
  --inset: #0e1114;     /* LCD wells, inputs, meter throats */
  --cell: #1d2127;      /* an empty step */
  --line: #22262d;
  --line-2: #2c323b;    /* control borders */
  --text: #e8ebf0;
  --dim: #aab2bf;
  --faint: #5c6472;
  --accent: #ff5d45;    /* brand (logo dot) = the kick's red */
  --play: #22c55e;      /* transport go */
  --lit: #ffc233;       /* engaged / warning amber */
  --ui: #7c9cff;        /* knob pointers, focus rings */
  --hue: var(--ui);     /* per-track color; overridden on every .track */
  --mono: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  -webkit-text-size-adjust: 100%;
}

button, select, input { font-family: inherit; }

:is(button, select, input, .knob-dial):focus-visible {
  outline: 2px solid var(--ui);
  outline-offset: 2px;
}

/* ── Header — slim DAW title bar ─────────────────────────────────────────── */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1.1rem;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}

.app-header h1 {
  margin: 0;
  font: 700 1rem/1.2 var(--sans);
  letter-spacing: 0.05em;
}
.app-header .accent { color: var(--accent); }

.tagline {
  margin: 0.15rem 0 0;
  color: var(--faint);
  font: 500 0.66rem/1.2 var(--mono);
  letter-spacing: 0.02em;
}

.help-btn {
  flex: 0 0 auto;
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  background: var(--inset);
  color: var(--faint);
  font: 600 0.95rem/1 var(--mono);
  cursor: pointer;
}
.help-btn:hover { color: var(--text); border-color: var(--ui); }

#app { padding: 0.9rem 1.1rem 1.5rem; }

.scaffold-note { color: var(--faint); font-size: 0.9rem; }

/* ── Transport — sticky control bar ──────────────────────────────────────── */

.transport {
  position: sticky;
  top: 0.5rem;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 0.6rem 1rem;
  margin-bottom: 0.9rem;
  padding: 0.6rem 0.75rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.45);
}

.tp-group { display: flex; flex-direction: column; gap: 0.3rem; }
.tp-label {
  font: 600 0.58rem/1 var(--mono);
  letter-spacing: 0.14em;
  color: var(--faint);
}
.tp-pair { display: inline-flex; gap: 0.35rem; }

.tp-play {
  align-self: stretch;
  min-width: 6.2rem;
  padding: 0 1rem;
  border: 1px solid var(--play);
  border-radius: 5px;
  background: var(--play);
  color: #06120a;
  font: 700 0.9rem/1 var(--sans);
  letter-spacing: 0.02em;
  cursor: pointer;
}
.tp-play:hover { filter: brightness(1.08); }
.tp-play:disabled { opacity: 0.6; cursor: default; }
/* While playing, the button is the "stop" affordance — quiet, not shouting. */
.tp-play.playing { background: transparent; color: var(--text); border-color: var(--line-2); }
.tp-play.playing:hover { border-color: var(--play); filter: none; }

.tp-bpm-range { accent-color: var(--ui); width: 9rem; cursor: pointer; vertical-align: middle; }
.tp-bpm-readout { display: inline-flex; align-items: baseline; gap: 0.3rem; margin-left: 0.5rem; }
.tp-bpm-val {
  width: 3.4rem;
  background: var(--inset);
  border: 1px solid var(--line-2);
  border-radius: 4px;
  color: var(--text);
  font: 600 0.95rem/1 var(--mono);
  text-align: right;
  padding: 0.25rem 0.35rem;
}
.tp-bpm-val:focus { outline: none; border-color: var(--ui); }
.tp-bpm-unit { font: 600 0.58rem/1 var(--mono); letter-spacing: 0.1em; color: var(--faint); }

.tp-btn, .tp-kit {
  background: #1e232a;
  color: var(--dim);
  border: 1px solid var(--line-2);
  border-radius: 4px;
  padding: 0.4rem 0.65rem;
  font: 600 0.8rem/1 var(--sans);
  cursor: pointer;
}
.tp-btn:hover, .tp-kit:hover { border-color: var(--ui); color: var(--text); }
.tp-btn:disabled { opacity: 0.4; cursor: default; border-color: var(--line-2); }
.tp-kit { color: var(--text); }

/* Toggle buttons (e.g. HUMANIZE) light amber when engaged. */
.tp-toggle { font: 700 0.7rem/1 var(--mono); letter-spacing: 0.08em; }
.tp-toggle.on { background: #2a2415; border-color: #6b5716; color: var(--lit); }

.tp-status {
  align-self: center;
  color: var(--faint);
  font: 500 0.72rem/1.3 var(--mono);
}

/* ── Track grid — channel strips ─────────────────────────────────────────── */

.tracks { display: flex; flex-direction: column; gap: 0.5rem; }

.tracks-empty { color: var(--faint); }

.track {
  display: flex;
  align-items: stretch;
  gap: 0.8rem;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-left: 3px solid var(--hue); /* the channel's color identity */
  border-radius: 4px;
  padding: 0.55rem 0.65rem;
}

/* Left control zone — fixed width so every row's steps start at the same x. */
.track-ctl {
  flex: 0 0 auto;
  width: 15rem;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas: "sound mix" "meta mix";
  align-items: center;
  gap: 0.4rem 0.6rem;
}
.track-sound {
  grid-area: sound;
  background: var(--inset);
  color: var(--hue);
  border: 1px solid var(--line-2);
  border-radius: 4px;
  padding: 0.35rem 0.4rem;
  font: 600 0.82rem/1 var(--sans);
  width: 100%;
}
.track-sound:hover { border-color: var(--ui); }

.track-meta { grid-area: meta; display: flex; gap: 0.6rem; }
.field { display: flex; flex-direction: column; gap: 0.15rem; }
.field-label {
  font: 600 0.56rem/1 var(--mono);
  letter-spacing: 0.1em;
  color: var(--faint);
}
.stepper {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--line-2);
  border-radius: 4px;
  overflow: hidden;
  background: var(--inset);
}
.stp {
  border: 0;
  background: transparent;
  color: var(--faint);
  font: 700 0.95rem/1 var(--mono);
  width: 1.5rem;
  height: 1.6rem;
  cursor: pointer;
}
.stp:hover { color: var(--text); background: var(--line-2); }
.stp-val {
  min-width: 1.6rem;
  text-align: center;
  font: 600 0.85rem/1 var(--mono);
  color: var(--text);
}

.track-mix { grid-area: mix; display: flex; flex-direction: column; align-items: center; gap: 0.35rem; }
.track-mute {
  width: 1.9rem;
  height: 1.9rem;
  border-radius: 4px;
  border: 1px solid var(--line-2);
  background: var(--inset);
  color: var(--faint);
  font: 700 0.8rem/1 var(--mono);
  cursor: pointer;
}
.track-mute:hover { color: var(--text); border-color: var(--ui); }
.track-mute.on { background: #2a2415; border-color: #6b5716; color: var(--lit); }
.track-vol { width: 4rem; accent-color: var(--hue); cursor: pointer; }

/* Steps — a single scrollable line; row width follows the step count. */
.track-steps {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: 4px;
  overflow-x: auto;
  padding: 4px 4px 5px; /* room for the playhead outline (2px + 1px offset) */
  min-width: 0;
  scrollbar-width: thin;
  scrollbar-color: var(--line-2) transparent;
}
.step {
  flex: 0 0 auto;
  width: 26px;
  height: 34px;
  border: 0;
  border-radius: 3px;
  background: var(--cell);
  cursor: pointer;
  padding: 0;
  transition: background 80ms ease;
}
.step:hover { background: #262c34; }
/* Beat grouping: extra gap + a light inset edge every `subdivision` steps. */
.step.beat-start { box-shadow: inset 2px 0 0 rgba(255, 255, 255, 0.14); }
.step.beat-start:not(:first-child) { margin-left: 10px; }
/* A hit — the track's hue. */
.step.on { background: var(--hue); box-shadow: none; }
.step.on.beat-start { box-shadow: inset 2px 0 0 rgba(255, 255, 255, 0.35); }
/* Transport cursor — a white frame sweeping each row at its own rate. */
.step.playing { outline: 2px solid #fff; outline-offset: 1px; }

/* Muted channel: hits stay visible but go cold. */
.track.muted .track-steps { filter: saturate(0.15) opacity(0.45); }

@media (prefers-reduced-motion: reduce) {
  .step { transition: none; }
}

/* ── Master strip ────────────────────────────────────────────────────────── */

.master { margin-top: 0.9rem; }
.master-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.9rem 1.3rem;
  padding: 0.8rem 1rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px;
}
.master-title {
  font: 700 0.72rem/1 var(--mono);
  letter-spacing: 0.22em;
  color: var(--dim);
  padding-right: 0.4rem;
}
.master-strip.bypassed .master-knobs { opacity: 0.4; }

.master-knobs { display: flex; gap: 1rem; flex-wrap: wrap; }
.knob { display: flex; flex-direction: column; align-items: center; gap: 0.3rem; width: 3.4rem; }
.knob-label { font: 600 0.56rem/1 var(--mono); letter-spacing: 0.1em; color: var(--faint); }
.knob-dial {
  position: relative;
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1.5px solid #343b45;
  background: var(--cell);
  cursor: ns-resize;
  touch-action: none;
}
.knob-ind {
  position: absolute;
  left: calc(50% - 1px);
  top: 4px;
  width: 2px; height: 40%;
  border-radius: 1px;
  background: var(--ui);
  transform-origin: 50% 100%;
}
.knob-val { font: 500 0.68rem/1 var(--mono); color: var(--dim); }

.master-meter-wrap { display: flex; flex-direction: column; align-items: center; gap: 0.3rem; }
.master-label { font: 600 0.56rem/1 var(--mono); letter-spacing: 0.1em; color: var(--faint); }
.master-meter-row { display: flex; align-items: flex-end; gap: 0.5rem; }
.master-meter {
  position: relative;
  width: 12px; height: 62px;
  border-radius: 2px;
  border: 1px solid var(--line-2);
  background: var(--inset);
  overflow: hidden;
}
.meter-fill {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 100%;
  transform-origin: bottom;
  transform: scaleY(0);
  background: linear-gradient(to top, var(--play) 0%, var(--lit) 72%, #f43f5e 100%);
}

/* Clip LED — latches when the limiter clamps hard. */
.master-clip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  background: transparent;
  border: 0;
  padding: 0 0 0.1rem;
  cursor: pointer;
}
.clip-led {
  width: 11px; height: 11px;
  border-radius: 50%;
  border: 1px solid var(--line-2);
  background: #241417;
}
.clip-text { font: 700 0.56rem/1 var(--mono); letter-spacing: 0.08em; color: var(--faint); }
.master-clip.on .clip-led {
  background: #f43f5e;
  border-color: #f43f5e;
  box-shadow: 0 0 8px 1px rgba(244, 63, 94, 0.8);
}
.master-clip.on .clip-text { color: #f43f5e; }

.master-bypass {
  margin-left: auto;
  align-self: center;
  background: #1e232a;
  color: var(--dim);
  border: 1px solid var(--line-2);
  border-radius: 4px;
  padding: 0.5rem 0.85rem;
  font: 700 0.7rem/1 var(--mono);
  letter-spacing: 0.1em;
  cursor: pointer;
}
.master-bypass:hover { color: var(--text); border-color: var(--ui); }
.master-bypass.on { background: #2a2415; border-color: #6b5716; color: var(--lit); }

/* ── Help modal ──────────────────────────────────────────────────────────── */

.help-dialog {
  width: min(92vw, 640px);
  max-height: 85vh;
  margin: auto;
  padding: 0;
  border: 1px solid var(--line-2);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  overflow: auto;
  overscroll-behavior: contain;
}
.help-dialog::backdrop { background: rgba(5, 6, 9, 0.72); }

.help-body { position: relative; padding: 1.5rem 1.6rem 1.8rem; }

.help-close {
  position: absolute;
  top: 0.8rem;
  right: 0.9rem;
  width: 2rem;
  height: 2rem;
  border-radius: 4px;
  border: 1px solid var(--line-2);
  background: var(--inset);
  color: var(--faint);
  font: 400 1.4rem/1 var(--sans);
  cursor: pointer;
}
.help-close:hover { color: var(--text); border-color: var(--ui); }

.help-body h2 {
  margin: 0 2rem 0.4rem 0;
  font: 700 1.4rem/1 var(--sans);
  letter-spacing: 0.06em;
}
.help-body h2 .accent { color: var(--accent); }

.help-lede { margin: 0 0 0.5rem; color: var(--dim); }

.help-body h3 {
  margin: 1.4rem 0 0.5rem;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
  font: 700 0.7rem/1 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ui);
}

.help-body p { margin: 0 0 0.5rem; line-height: 1.55; }
.help-body ul { margin: 0; padding-left: 1.1rem; }
.help-body li { margin: 0.35rem 0; line-height: 1.5; }
.help-body strong { color: var(--text); font-weight: 700; }
.help-body em { color: var(--text); font-style: normal; border-bottom: 1px dotted var(--faint); }

@media (prefers-reduced-motion: no-preference) {
  .help-dialog[open] { animation: help-in 140ms ease-out; }
  @keyframes help-in { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
}

/* ── Narrow screens — channel controls stack above the step row ─────────── */

@media (max-width: 720px) {
  #app { padding: 0.7rem 0.7rem 1.2rem; }
  .app-header { padding: 0.6rem 0.8rem; }

  .transport { top: 0.35rem; gap: 0.55rem 0.8rem; }
  .tp-play { flex: 1 1 100%; min-height: 2.6rem; }
  .tp-bpm-range { width: min(9rem, 34vw); }
  .tp-status { flex-basis: 100%; }

  .track { flex-direction: column; gap: 0.45rem; }
  .track-ctl {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem 0.6rem;
  }
  .track-sound { width: auto; flex: 1 1 7rem; }
  .track-mix { flex-direction: row; align-items: center; }

  /* Touch-sized steps; the row scrolls sideways under the thumb. */
  .step { width: 30px; height: 42px; }
}

/* Coarse pointers get bigger targets regardless of width. */
@media (pointer: coarse) {
  .stp { width: 2rem; height: 2rem; }
  .track-mute { width: 2.2rem; height: 2.2rem; }
  .track-vol { width: 6rem; }
  .knob-dial { width: 48px; height: 48px; }
}