:root {
  --bg: #0b0e10;
  --panel: #14181b;
  --border: #263238;
  --accent: #00e5e5;
  --text: #d8e2e2;
  --muted: #7c8a8a;
  --ok: #3ddc84;
  --warn: #e5b800;
  --off: #556065;
  font-family: -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

header h1 {
  font-size: 1.15rem;
  margin: 0;
  color: var(--accent);
  letter-spacing: 0.03em;
}

.status {
  color: var(--muted);
  font-size: 0.9rem;
}

.status.error { color: #ff6b6b; }
.status.ok { color: var(--ok); }

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.file-label {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.85rem;
}

.file-label input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

button, select {
  background: #1b2124;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.4rem 0.7rem;
  font-size: 0.85rem;
}

button:not(:disabled), select:not(:disabled) {
  cursor: pointer;
}

button:not(:disabled):hover {
  border-color: var(--accent);
  color: var(--accent);
}

button:disabled, select:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

main {
  display: block;
  padding: 1.5rem;
}

#soundInfoSection {
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0 0 0.75rem 0;
}

.sound-info {
  font-size: 0.85rem;
  line-height: 1.6;
}

.sound-info .row {
  display: flex;
  gap: 0.5rem;
}

.sound-info .label {
  color: var(--muted);
  width: 5rem;
  flex: none;
}

.sound-info .value {
  color: var(--text);
  word-break: break-all;
}

.sound-info .value.name {
  color: var(--accent);
  font-weight: 600;
}

.sound-info .name-input {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 3px;
  padding: 0.05em 0.3em;
  margin: -0.05em -0.3em;
  font: inherit;
  min-width: 0;
  flex: 1;
}

.sound-info .name-input:hover {
  border-color: var(--border);
}

.sound-info .name-input:focus {
  outline: none;
  border-color: var(--accent);
  background: #0e1315;
}

.param-category {
  margin-bottom: 1.5rem;
}

/* Oscillator panel -- a loose hardware-synth-panel treatment (see
   OSC_PANELS in app.js): dark brushed-metal-ish gradient, a title bar,
   and knob-over-readout cells arranged in per-oscillator rows instead of
   the plain label-left/control-right list every other category uses. */
.synth-panel {
  background: linear-gradient(180deg, #414b50 0%, #31383c 100%);
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 1.5rem;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.03);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.synth-panel-title {
  text-align: center;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0.55rem 0;
  background: linear-gradient(180deg, #262c2f, #181c1e);
  border-bottom: 1px solid var(--border);
}

.synth-panel-body {
  padding: 1rem 1.25rem 1.25rem;
}

.synth-osc-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 0.7rem 0;
}

.synth-osc-row + .synth-osc-row {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.synth-shared-row {
  margin-top: 0.2rem;
  border-top: 1px dashed var(--border) !important;
}

.synth-row-label {
  flex: none;
  width: 3.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.03em;
}

.synth-cells {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.2rem;
}

.synth-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  min-width: 4.6rem;
}

.synth-cell-label {
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text);
  text-align: center;
}

.synth-cell-control {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
}

.synth-cell-control select {
  max-width: 11rem;
}

.synth-cell-control input[type="number"] {
  width: 4.4rem;
  text-align: center;
  color: var(--accent);
  background-color: var(--bg);
  border: 1px solid #00e5e5;
  width: 50px;
}

.synth-cell .knob {
  width: 30px;
  height: 30px;
}

/* Read-only "100/0".."0/100" balance readout (Osc 1/2 Mix, Osc 3/4
   Pre/Post Filter) -- sized to match the number inputs it stands in for
   so knob rows stay aligned. Adjusted via the knob only. */
.ratio-readout {
  display: inline-block;
  width: 4.4rem;
  padding: 0.25rem 0;
  text-align: center;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  background: #0f1417;
  border: 1px solid var(--border);
  border-radius: 3px;
  font-size: 0.85rem;
  cursor: default;
  user-select: none;
}

.envelope-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.4rem 0.75rem;
  margin: 0 auto 0.75rem;
  max-width: 32rem;
}

@media (max-width: 640px) {
  .envelope-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

.param-category h3 {
  font-size: 0.85rem;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3rem;
  margin: 0 0 0.5rem 0;
}

.envelope-viz-wrap {
  display: block;
  width: fit-content;
  margin: 0 auto 0.6rem;
  padding: 0.4rem;
  background: #000;
  border: 1px solid var(--accent);
  border-radius: 4px;
}

.envelope-viz {
  display: block;
  width: 220px;
  height: 54px;
}

.envelope-viz-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.5;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.envelope-tabbar {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.envelope-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  background: #14181b;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.7rem;
  color: var(--muted);
  cursor: pointer;
}

.envelope-tab:hover {
  border-color: var(--accent);
  color: var(--text);
}

.envelope-tab.active {
  background: #182226;
  border-color: var(--accent);
  color: var(--text);
}

.envelope-tab-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.envelope-tab-icon {
  width: 56px;
  height: 24px;
}

.envelope-tab.active .envelope-tab-icon .envelope-viz-line {
  stroke: var(--accent);
}

.envelope-tab:not(.active) .envelope-tab-icon .envelope-viz-line {
  stroke: var(--muted);
}

/* Read-only overlay of all five envelopes, sitting to the right of the
   tabs. Same box shape as a tab so the row reads as one unit, but no
   hover/active states and no pointer cursor -- it isn't clickable. */
.envelope-composite {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  background: #000;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.7rem;
  color: var(--muted);
}

/* Must keep ENV_VIZ_COMPOSITE's 150:24 viewBox aspect, or the curves get
   letterboxed into part of the box. */
.envelope-composite-svg {
  width: 150px;
  height: 24px;
}

/* Five shades from pale cyan through to blue, in tab order
   (Pitch, Lowpass, Amp, Aux 1, Aux 2). */
.envelope-composite-line-0 { stroke: #9bf6ff; }
.envelope-composite-line-1 { stroke: #4fe3ea; }
.envelope-composite-line-2 { stroke: #00e5e5; }
.envelope-composite-line-3 { stroke: #2f9fd8; }
.envelope-composite-line-4 { stroke: #5f7fe0; }

.envelope-composite .envelope-viz-line {
  stroke-width: 1.25;
  opacity: 0.9;
}

.modpath-grid {
  display: grid;
  grid-template-columns: 3.5rem minmax(160px, 1fr) 8rem minmax(180px, 1fr);
  gap: 0.5rem 0.75rem;
  align-items: center;
}

.modpath-row {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: subgrid;
  align-items: center;
}

.modpath-header span {
  color: var(--muted);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.modpath-label {
  color: var(--muted);
  font-size: 0.8rem;
}

.modpath-cell {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  min-width: 0;
}

.modpath-cell select,
.modpath-cell input[type="number"] {
  flex: 1;
  min-width: 0;
  width: auto;
}

.param-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  flex-wrap: wrap;
}

.param-row.is-untested {
  opacity: 0.55;
}

.param-name {
  flex: 1 1 220px;
  font-size: 0.85rem;
}

.param-range {
  color: var(--muted);
  font-size: 0.72rem;
  display: block;
}

.param-control {
  flex: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.param-control input[type="number"],
.param-control input[type="range"] {
  width: 6em;
}

.knob-input-wrap {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

/* Click-and-drag plugin-style knob, satellite to the number input next to
   it -- see createKnob() in app.js. Desktop-only interaction (drag), so no
   touch/mobile affordance is provided.

   Visual style: a fluted black ring (a repeating-conic-gradient standing
   in for individually modeled gear facets) around a raised grey center
   cap, with a light-grey rectangular position tab -- approximating a
   hardware synth's own knob caps rather than the flat cyan-line style
   this replaced. */
.knob {
  width: 26px;
  height: 26px;
  flex: none;
  cursor: ns-resize;
  user-select: none;
  -webkit-user-select: none;
}

.knob-dial {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  position: relative;
  background:
    radial-gradient(circle at 36% 30%, rgba(255, 255, 255, 0.12) 0%, rgba(255, 255, 255, 0) 42%),
    repeating-conic-gradient(from 0deg,
      #07090a 0deg 27deg,
      #1d2124 27deg 30deg,
      #020304 30deg 33deg,
      #151819 33deg 36deg);
  border: 1px solid #020304;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.6), inset 0 1px 1px rgba(255, 255, 255, 0.05);
}

.knob-dial::before {
  /* Raised grey center cap, sitting on top of the fluted ring. */
  content: "";
  position: absolute;
  top: 19%;
  left: 19%;
  right: 19%;
  bottom: 19%;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 28%, #969ba1 0%, #6d7276 55%, #55595d 100%);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.55), inset 0 1px 1px rgba(255, 255, 255, 0.18);
}

.knob.dragging .knob-dial,
.knob:hover .knob-dial {
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.6), 0 0 0 2px rgba(0, 229, 229, 0.3), inset 0 1px 1px rgba(255, 255, 255, 0.05);
}

.knob-pointer {
  /* Anchored at the dial's center, extending UP toward 12 o'clock at rest
     (rotate(0)) -- createKnob()'s angle math (KNOB_MIN/MAX_ANGLE = -/+135)
     assumes 0deg = up, sweeping counter-clockwise to lower-left at the
     minimum value and clockwise to lower-right at the maximum. */
  position: absolute;
  left: 50%;
  bottom: 50%;
  width: 24%;
  height: 38%;
  margin-left: -12%;
  background: linear-gradient(to bottom, #cbd0d4 0%, #989ea3 100%);
  border-radius: 2px 2px 1px 1px;
  box-shadow: 0 0 1px rgba(0, 0, 0, 0.5);
  transform-origin: 50% 100%;
}

.raw-byte-input {
  width: 2.4em;
  text-align: center;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  text-transform: uppercase;
}

.param-caution {
  color: var(--warn);
  font-size: 0.7rem;
}

/* ---- Kit/Beat screen (kit.js) ---- */

/* Column A (pads A1-A16) and Column B (pads B1-B16) side by side,
   matching the Tempest's own two-bank pad layout. */
.kit-sound-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 1.5rem;
}

@media (max-width: 640px) {
  .kit-sound-columns { grid-template-columns: 1fr; }
}

.kit-sound-column-heading {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

.kit-sound-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

/* Overrides .synth-cell's narrow centered-column layout (built for a
   knob+label) with a full-width row: index label, name field, load
   button -- .synth-cell's other properties (gap, etc.) are still fine to
   inherit. */
.kit-sound-row {
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  width: 100%;
  min-width: 0;
}

.kit-sound-row .synth-cell-label {
  flex: none;
  width: 1rem;
  text-align: left;
}

.kit-sound-row .name-input {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.3rem 0.5rem;
  font: inherit;
  color: var(--accent);
  font-weight: 600;
}

.kit-sound-row .name-input:hover,
.kit-sound-row .name-input:focus {
  border-color: var(--accent);
}

.kit-sound-row .kit-slot-load {
  flex: none;
  font-size: 0.75rem;
  padding: 0.35rem 0.6rem;
}