/* =============================================================
   STG-UI-016 · tokens-delta.css
   Delta tokens on top of tokens-stg.css for Velocity panel
   + Advanced grid line overrides.
   ============================================================= */

:root {
  /* ── Track pastels (from TRACK_COLORS / drumseqNotes.mjs) ── */
  --trk-kick:    #8db89a;
  --trk-snare:   #a3c4d1;
  --trk-hihat:   #d4c4a8;
  --trk-clap:    #c9b5d4;
  --trk-808:     #d4b8a0;
  --trk-perc:    #a8c4b8;
  --trk-rim:     #b8c8d8;

  /* ── Velocity panel ──────────────────────────────────────── */
  --vel-bar-w:          22px;          /* individual bar width */
  --vel-bar-max-h:      96px;          /* max bar height = MIDI 127 */
  --vel-bar-gap:        2px;
  --vel-bar-radius:     3px 3px 0 0;
  --vel-panel-bg:       var(--stg-paper, #ffffff);
  --vel-panel-radius:   var(--stg-r-lg, 24px);
  --vel-panel-shadow:   var(--stg-lift-2);
  --vel-empty-bg:       var(--stg-paper-deep, #f3f2ee);
  --vel-tooltip-bg:     var(--stg-ink, #161a14);
  --vel-tooltip-color:  var(--stg-paper, #ffffff);

  /* ── Advanced grid lines (thicker + blacker) ─────────────── */
  --adv-line-bar:       rgba(0,0,0,0.85);   /* 2px — bar boundaries */
  --adv-line-beat:      rgba(0,0,0,0.55);   /* 1.5px — strong beats */
  --adv-line-sub:       rgba(0,0,0,0.12);   /* 1px — subdivisions */
  --adv-line-row:       rgba(0,0,0,0.18);   /* 1.5px — horizontal track sep */
}
/* =============================================================
   STG-UI-016 · velocity-panel.css
   Velocity panel component + Advanced grid line overrides.
   Extends sequencer-stg.css — does NOT replace it.
   ============================================================= */

/* ── 1. Velocity trigger button (replaces .seq-add zone) ──── */

.velocity-trigger-zone {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed rgba(22, 26, 20, 0.1);
}

.velocity-trigger-zone__lab {
  font-family: var(--font-ui, "Inter Tight", sans-serif);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--stg-ink-4, #a6a59b);
  margin: 0;
}

#velocityPanelBtn,
#velocityPanelBtnAdv,
.velocity-panel-trigger {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px 7px 14px;
  background: var(--stg-paper, #fff);
  border: none;
  border-radius: var(--stg-r-pill, 9999px);
  cursor: pointer;
  font-family: var(--font-ui, "Inter Tight", sans-serif);
  font-size: 12px;
  font-weight: 600;
  color: var(--stg-ink, #161a14);
  letter-spacing: 0.02em;
  transition: background var(--dur-1, 120ms) var(--ease), box-shadow var(--dur-1, 120ms) var(--ease);
  box-shadow: inset 0 0 0 1px rgba(22, 26, 20, 0.1);
}

#velocityPanelBtn:hover,
#velocityPanelBtnAdv:hover,
.velocity-panel-trigger:hover {
  background: var(--stg-paper-deep, #f3f2ee);
  box-shadow: inset 0 0 0 1px rgba(22, 26, 20, 0.16);
}

#velocityPanelBtn.is-open,
#velocityPanelBtnAdv.is-open,
.velocity-panel-trigger.is-open {
  background: var(--stg-ink, #161a14);
  color: var(--stg-paper, #fff);
  box-shadow: none;
}

#velocityPanelBtn .vel-btn-icon,
#velocityPanelBtnAdv .vel-btn-icon,
.velocity-panel-trigger .vel-btn-icon {
  display: flex;
  align-items: flex-end;
  gap: 1.5px;
  height: 12px;
}

#velocityPanelBtn .vel-btn-icon span,
#velocityPanelBtnAdv .vel-btn-icon span,
.velocity-panel-trigger .vel-btn-icon span {
  display: block;
  width: 2.5px;
  border-radius: 1px 1px 0 0;
  background: currentColor;
  opacity: 0.7;
}

#velocityPanelBtn .vel-chevron,
#velocityPanelBtnAdv .vel-chevron,
.velocity-panel-trigger .vel-chevron {
  width: 10px;
  height: 10px;
  transition: transform var(--dur-2, 240ms) var(--ease);
}

#velocityPanelBtn.is-open .vel-chevron,
#velocityPanelBtnAdv.is-open .vel-chevron,
.velocity-panel-trigger.is-open .vel-chevron {
  transform: rotate(180deg);
}

/* ── 2. Add track — top-left slot (replaces Kit) ──────────── */

.seq-add-track-top {
  display: flex;
  align-items: center;
  gap: 6px;
}

.seq-add-track-top__lab {
  font-family: var(--font-ui, "Inter Tight", sans-serif);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--stg-ink-4, #a6a59b);
}

.seq-add-track-top__pill {
  appearance: none;
  -webkit-appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--stg-paper, #fff);
  border: none;
  cursor: pointer;
  border-radius: var(--stg-r-pill, 9999px);
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--stg-ink, #161a14);
  font-family: var(--font-ui, "Inter Tight", sans-serif);
}

.seq-add-track-top__circle {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--stg-paper, #fff);
  border: none;
  cursor: pointer;
  display: grid;
  place-items: center;
  font-family: var(--font-display, "Fraunces", Georgia, serif);
  font-size: 16px;
  color: var(--stg-ink, #161a14);
  transition: background var(--dur-1, 120ms), color var(--dur-1, 120ms);
}

.seq-add-track-top__circle:hover {
  background: var(--stg-ink, #161a14);
  color: var(--stg-paper, #fff);
}

/* ── 3. Velocity panel (the flyout) ───────────────────────── */

#velocityPanel,
#velocityPanelAdv {
  background: var(--vel-panel-bg, #fff);
  border-radius: var(--vel-panel-radius, 24px);
  box-shadow: var(--vel-panel-shadow);
  padding: 16px 20px 20px;
  margin-top: 10px;
  position: relative;
  overflow: hidden;
  animation: velPanelIn var(--dur-2, 240ms) var(--ease) both;
}

#velocityPanel[hidden],
#velocityPanelAdv[hidden] {
  display: none;
}

@keyframes velPanelIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Panel header */
.velocity-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.velocity-panel__title {
  font-family: var(--font-display, "Fraunces", Georgia, serif);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--stg-ink, #161a14);
  margin: 0;
}

.velocity-panel__title em {
  font-style: italic;
}

/* ── 3a. Track tabs inside the panel ──────────────────────── */

.velocity-panel__track-tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  align-items: center;
}

.velocity-panel__tab {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 5px 12px;
  border-radius: var(--stg-r-pill, 9999px);
  border: none;
  background: var(--stg-paper-deep, #f3f2ee);
  cursor: pointer;
  font-family: var(--font-ui, "Inter Tight", sans-serif);
  font-size: 11px;
  font-weight: 500;
  color: var(--stg-ink-2, #38382f);
  transition: background var(--dur-1, 120ms), color var(--dur-1, 120ms);
}

.velocity-panel__tab:hover {
  background: var(--stg-paper, #fff);
  color: var(--stg-ink, #161a14);
}

.velocity-panel__tab.is-active {
  background: var(--stg-ink, #161a14);
  color: var(--stg-paper, #fff);
}

.velocity-panel__tab-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ── 3b. Bars area ────────────────────────────────────────── */

.velocity-panel__bars-wrap {
  position: relative;
}

.velocity-panel__bars {
  display: flex;
  align-items: flex-end;
  gap: var(--vel-bar-gap, 2px);
  height: var(--vel-bar-max-h, 96px);
  padding: 0 2px;
}

/* beat group container — keeps 4 bars grouped */
.velocity-panel__beat-group {
  display: flex;
  align-items: flex-end;
  gap: var(--vel-bar-gap, 2px);
  flex: 1;
  min-width: 0;
  position: relative;
}

/* downbeat marker below beat groups */
.velocity-panel__beat-group::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  bottom: 0;
  width: 1px;
  background: rgba(22, 26, 20, 0.08);
  pointer-events: none;
}

.velocity-panel__beat-group:first-child::before {
  display: none;
}

/* Individual bar */
.velocity-bar {
  flex: 1;
  min-width: 0;
  position: relative;
  cursor: ns-resize;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: stretch;
}

.velocity-bar__fill {
  border-radius: var(--vel-bar-radius, 3px 3px 0 0);
  background: var(--bar-color, var(--stg-pop-mint, #b8e6c9));
  transition: height var(--dur-1, 120ms) var(--ease);
  min-height: 0;
  position: relative;
}

/* Empty step (no hit) */
.velocity-bar--empty .velocity-bar__fill {
  background: var(--vel-empty-bg, #f3f2ee);
  height: 3px !important;
  border-radius: 2px;
  opacity: 0.6;
}

/* Hover state */
.velocity-bar:not(.velocity-bar--empty):hover .velocity-bar__fill {
  filter: brightness(1.06);
  box-shadow: 0 -2px 8px rgba(0,0,0,0.08);
}

/* Active / dragging state */
.velocity-bar.is-dragging .velocity-bar__fill {
  filter: brightness(0.92);
  box-shadow: 0 -3px 12px rgba(0,0,0,0.14);
}

/* Velocity value tooltip */
.velocity-bar__val {
  position: absolute;
  top: -22px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--vel-tooltip-bg, #161a14);
  color: var(--vel-tooltip-color, #fff);
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 9px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  padding: 2px 5px;
  border-radius: 4px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--dur-1, 120ms);
  z-index: 5;
}

.velocity-bar:hover .velocity-bar__val,
.velocity-bar.is-dragging .velocity-bar__val {
  opacity: 1;
}

/* Step numbers below bars */
.velocity-panel__step-nums {
  display: flex;
  gap: var(--vel-bar-gap, 2px);
  margin-top: 4px;
  padding: 0 2px;
}

.velocity-panel__step-nums-group {
  display: flex;
  gap: var(--vel-bar-gap, 2px);
  flex: 1;
  min-width: 0;
}

.velocity-panel__step-num {
  flex: 1;
  text-align: center;
  font-family: var(--font-mono, "JetBrains Mono", monospace);
  font-size: 8px;
  color: var(--stg-ink-4, #a6a59b);
  font-variant-numeric: tabular-nums;
}

.velocity-panel__step-num.is-downbeat {
  color: var(--stg-ink-2, #38382f);
  font-weight: 600;
}

/* ── 3c. Panel linked ring on Quick pads (optional) ───────── */

.step-pad.velocity-highlight {
  outline: 2px solid var(--stg-accent, #d9f274);
  outline-offset: -1px;
}

/* ── 4. Component states page — closed state ──────────────── */

.velocity-panel--closed #velocityPanelBtn,
.velocity-panel--closed #velocityPanelBtnAdv {
  /* just default state */
}

/* Mobile bottom sheet variant */
@media (max-width: 768px) {
  #velocityPanel,
  #velocityPanelAdv {
    border-radius: var(--stg-r-xl, 32px) var(--stg-r-xl, 32px) 0 0;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 100;
    max-height: 60vh;
    overflow-y: auto;
    animation: velSheetUp var(--dur-3, 420ms) var(--ease) both;
  }

  @keyframes velSheetUp {
    from {
      transform: translateY(100%);
    }
    to {
      transform: translateY(0);
    }
  }

  .velocity-panel__bars {
    --vel-bar-max-h: 80px;
  }
}

/* ── 5. Advanced grid lines — thicker + blacker ───────────── */

/* Override canvas drawing params — these classes are for the static mockup */
.ds-grid-canvas--stg016 {
  /* Token reference only — actual rendering is in JS below */
}

/* Static Advanced grid (HTML/CSS version for mockup) */
.adv-grid-016 {
  position: relative;
  display: grid;
  grid-template-columns: repeat(32, 1fr);
  min-height: 280px;
}

.adv-grid-016__row {
  display: contents;
}

.adv-grid-016__cell {
  height: 44px;
  position: relative;
  /* subdivision line (right edge) */
  border-right: 1px solid var(--adv-line-sub, rgba(0,0,0,0.12));
  /* horizontal separator */
  border-bottom: 1.5px solid var(--adv-line-row, rgba(0,0,0,0.18));
}

/* beat boundaries (every 4th subdivision in 1/8) */
.adv-grid-016__cell:nth-child(8n+1) {
  border-left: 1.5px solid var(--adv-line-beat, rgba(0,0,0,0.55));
}

/* bar boundaries (every 8th) */
.adv-grid-016__cell:nth-child(8n+1) {
  /* 1-indexed: cells 1, 9, 17, 25 */
}

/* 
   The actual thick bar lines are applied via the canvas JS draw 
   function below. The CSS grid above is a fallback/visual guide.
*/

/* Row alternation for readability */
.adv-grid-016__row:nth-child(odd) .adv-grid-016__cell {
  background: var(--stg-paper, #fff);
}

.adv-grid-016__row:nth-child(even) .adv-grid-016__cell {
  background: var(--stg-paper-deep, #f5f4f0);
}

/* Note blocks in Advanced grid */
.adv-note-016 {
  position: absolute;
  top: 4px;
  bottom: 4px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  padding: 0 6px;
  font-family: var(--font-ui, "Inter Tight", sans-serif);
  font-size: 9px;
  font-weight: 600;
  color: var(--stg-ink, #161a14);
  overflow: hidden;
  z-index: 2;
}

/* ── 6. Advanced — Add track at top, Velocity at bottom ───── */

.ds-track-panel-016 {
  display: flex;
  flex-direction: column;
}

.ds-add-track-top-016 {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  margin-bottom: 4px;
}

.ds-add-track-top-016 .ds-add-track-select {
  font-family: var(--font-ui, "Inter Tight", sans-serif);
  font-size: 11px;
  font-weight: 500;
  padding: 4px 8px;
  border-radius: var(--stg-r-sm, 8px);
  border: 1px solid var(--stg-border-strong, rgba(22,26,20,0.14));
  background: var(--stg-paper, #fff);
  color: var(--stg-ink, #161a14);
  cursor: pointer;
}

.ds-add-track-top-016 .ds-add-track-btn {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--stg-paper-deep, #f3f2ee);
  border: none;
  cursor: pointer;
  display: grid;
  place-items: center;
  font-size: 13px;
  color: var(--stg-ink-3, #6b6b5f);
  transition: background var(--dur-1, 120ms), color var(--dur-1, 120ms);
}

.ds-add-track-top-016 .ds-add-track-btn:hover {
  background: var(--stg-ink, #161a14);
  color: var(--stg-paper, #fff);
}

.ds-velocity-bottom-016 {
  flex-shrink: 0;
  padding: 8px 12px 10px;
  border-top: 1px dashed rgba(22, 26, 20, 0.1);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  background: var(--stg-paper, #fff);
}

#page-sequencer .drumseq-app .ds-grid-area .ds-velocity-bottom-016 {
  width: 100%;
  min-width: 0;
}

#page-sequencer .drumseq-app .ds-grid-area #velocityPanelAdv {
  width: 100%;
  box-sizing: border-box;
}