/* ===========================================================
   VOXXY — Nightcall-style rack UI
   Palette: near-black navy chassis, cold steel-blue idle state,
   hot red/crimson reserved for active signal (meters/LEDs).
   =========================================================== */

:root {
  --bg-void: #05070d;
  --bg-panel: #0c1220;
  --bg-panel-raised: #121a2c;
  --steel: #4a6b8f;
  --steel-dim: #2c3d52;
  --steel-bright: #7fa8d6;
  --ink: #9fb3cc;
  --ink-bright: #e8eefc;
  --red: #ff2a3d;
  --red-glow: #ff2a3dcc;
  --red-dim: #5c1520;
  --border: #1c2740;
}

* { box-sizing: border-box; }

/* [hidden] must win over component display rules like .source-controls's flex */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
  color: var(--ink);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  min-height: 100%;
}

html {
  background: var(--bg-void);
}

/* body deliberately has NO background of its own: as a normal in-flow
   block box it would paint that background AFTER (on top of) the
   negative-z-index #bgGradient/#crtOverlay fixed layers, hiding them
   completely regardless of z-index. html's background covers any gap. */
body {
  padding: 24px 16px 48px;
}

/* ---------------------------- CRT overlay ---------------------------- */
/* Plain alpha compositing (no mix-blend-mode): "overlay"/"screen" blend
   math collapses toward invisible against a near-black backdrop like
   --bg-void, in every browser, not just Firefox -- confirmed by sampling
   rendered pixels. Solid light-colored strokes at modest alpha over a
   dark background are visible unconditionally, so use those instead. */

#bgGradient {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  background: radial-gradient(ellipse at 50% -10%, #14203a 0%, transparent 55%), var(--bg-void);
}

#crtOverlay {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(
      to bottom,
      rgba(180, 210, 255, 0.14) 0px,
      rgba(180, 210, 255, 0.14) 1px,
      transparent 2px,
      transparent 4px
    ),
    radial-gradient(ellipse at center, transparent 40%, rgba(0, 0, 0, 0.7) 100%);
  background-size: 100% 4px, 100% 100%;
  animation: crt-scan 7s linear infinite, crt-flicker 5s ease-in-out infinite;
}

/* slow bright roll-bar sweeping down the screen, classic CRT vertical hold drift */
#crtOverlay::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(180, 210, 255, 0.07) 45%,
    rgba(180, 210, 255, 0.14) 50%,
    rgba(180, 210, 255, 0.07) 55%,
    transparent 100%
  );
  background-size: 100% 240%;
  animation: crt-roll 11s linear infinite;
}

@keyframes crt-scan {
  from { background-position: 0 0, 0 0; }
  to { background-position: 0 400px, 0 0; }
}

@keyframes crt-flicker {
  0%, 100% { opacity: 0.8; }
  50% { opacity: 1; }
  52% { opacity: 0.55; }
  54% { opacity: 1; }
  76% { opacity: 0.9; }
  78% { opacity: 1; }
}

@keyframes crt-roll {
  from { background-position: 0 -140%; }
  to { background-position: 0 140%; }
}

@media (prefers-reduced-motion: reduce) {
  #crtOverlay, #crtOverlay::after { animation: none; }
  #crtOverlay { opacity: 0.85; }
}

/* ---------------------------- header ---------------------------- */

.rack-header {
  max-width: 900px;
  margin: 0 auto 20px;
  text-align: center;
  position: relative;
}

.brand {
  margin: 0;
  font-size: 2.6rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--ink-bright);
  text-shadow: 0 0 18px rgba(127, 168, 214, 0.55), 0 0 40px rgba(127, 168, 214, 0.25);
}

.tagline {
  margin: 2px 0 0;
  font-size: 0.75rem;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: var(--steel);
}

.led {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--red-dim);
  box-shadow: inset 0 0 3px #000;
  transition: background 0.15s ease, box-shadow 0.15s ease;
}

.led.on {
  background: var(--red);
  box-shadow: 0 0 8px var(--red-glow), 0 0 18px var(--red-glow);
}

/* ---------------------------- rack layout ---------------------------- */

.rack {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.panel-wide { grid-column: 1 / -1; }

.panel {
  background: linear-gradient(180deg, var(--bg-panel-raised) 0%, var(--bg-panel) 100%);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 16px 18px;
  box-shadow:
    0 1px 0 rgba(255,255,255,0.04) inset,
    0 8px 24px rgba(0,0,0,0.45);
}

.panel-title {
  margin: 0 0 12px;
  font-size: 0.7rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--steel-bright);
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

/* ---------------------------- collapsible panels ---------------------------- */

.collapsible summary.panel-title {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.collapsible summary.panel-title::-webkit-details-marker { display: none; }

.collapsible summary.panel-title::after {
  content: '▾';
  color: var(--steel);
  font-size: 0.9em;
  transition: transform 0.15s ease;
}

.collapsible:not([open]) summary.panel-title::after { transform: rotate(-90deg); }

.collapsible:not([open]) summary.panel-title {
  margin-bottom: 0;
  border-bottom: none;
  padding-bottom: 0;
}

/* ---------------------------- controls ---------------------------- */

.control-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: flex-start;
}

.knob-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  width: 64px;
}

.knob-unit label {
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.val {
  color: var(--steel-bright);
  font-variant-numeric: tabular-nums;
  font-size: 0.68rem;
}

.slider-wrap {
  width: 34px;
  height: 110px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Vertical slider via rotation trick: reliable across Chrome/Firefox */
.v-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100px;
  height: 6px;
  margin: 0;
  transform: rotate(-90deg);
  background: transparent;
  cursor: pointer;
}

.v-slider::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--steel-dim), var(--steel));
  border: 1px solid #000a;
}

.v-slider::-moz-range-track {
  height: 6px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--steel-dim), var(--steel));
  border: 1px solid #000a;
}

.v-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  margin-top: -8px;
  background: radial-gradient(circle at 32% 28%, #dfe9f7 0%, var(--steel-bright) 38%, var(--steel) 70%, #1a2436 100%);
  border: 1px solid #06090f;
  box-shadow: 0 2px 4px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.05);
}

.v-slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 28%, #dfe9f7 0%, var(--steel-bright) 38%, var(--steel) 70%, #1a2436 100%);
  border: 1px solid #06090f;
  box-shadow: 0 2px 4px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.05);
}

.v-slider:active::-webkit-slider-thumb {
  box-shadow: 0 0 10px var(--red-glow), 0 2px 4px rgba(0,0,0,0.6);
}

.v-slider:active::-moz-range-thumb {
  box-shadow: 0 0 10px var(--red-glow), 0 2px 4px rgba(0,0,0,0.6);
}

/* ---------------------------- buttons / toggles ---------------------------- */

.rack-btn {
  background: linear-gradient(180deg, #1a2438, #0d1422);
  color: var(--ink-bright);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 18px;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 1px 0 rgba(255,255,255,0.05) inset, 0 3px 8px rgba(0,0,0,0.4);
  transition: box-shadow 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.rack-btn:hover:not(:disabled) {
  border-color: var(--steel);
}

.rack-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.rack-btn.active {
  color: #fff;
  border-color: var(--red);
  box-shadow: 0 0 10px var(--red-glow) inset, 0 0 14px rgba(255,42,61,0.35);
}

.preset-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.preset-row + .preset-row {
  margin-top: 10px;
}

.preset-select,
.preset-name-input {
  background: var(--bg-panel);
  color: var(--ink-bright);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 0.78rem;
  letter-spacing: 0.03em;
}

.preset-select {
  flex: 1;
  min-width: 0;
}

.preset-name-input {
  flex: 1;
  min-width: 0;
}

.preset-select:focus,
.preset-name-input:focus {
  outline: none;
  border-color: var(--steel-bright);
  background: var(--bg-panel-raised);
}

.preset-status {
  margin-top: 8px;
  font-size: 0.68rem;
  color: var(--steel);
  min-height: 1em;
}

.preset-import-label {
  background: linear-gradient(180deg, #1a2438, #0d1422);
  color: var(--ink-bright);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 9px 18px;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 1px 0 rgba(255,255,255,0.05) inset, 0 3px 8px rgba(0,0,0,0.4);
  flex-direction: row;
  align-items: center;
  gap: 0;
}

.preset-import-label:hover {
  border-color: var(--steel);
}

.preset-import-label input[type="file"] {
  display: none;
}

.preset-status.error { color: var(--red); }

.source-toggle {
  display: flex;
  gap: 6px;
  margin-bottom: 12px;
}

.tab-btn {
  flex: 1;
  background: var(--bg-panel);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 7px 10px;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
}

.tab-btn.active {
  color: var(--ink-bright);
  border-color: var(--steel-bright);
  background: var(--bg-panel-raised);
  box-shadow: 0 0 8px rgba(127,168,214,0.25) inset;
}

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

.file-buttons {
  display: flex;
  align-items: center;
  gap: 14px;
}

.file-label {
  font-size: 0.72rem;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.file-label input[type="file"] {
  color: var(--ink);
  font-size: 0.72rem;
  max-width: 220px;
}

.loop-toggle {
  font-size: 0.72rem;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 5px;
  cursor: pointer;
}

.midi-row {
  margin-top: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.midi-status {
  font-size: 0.68rem;
  color: var(--steel);
  margin: 0;
}

.midi-status.connected { color: var(--steel-bright); }

.error-msg {
  color: var(--red);
  font-size: 0.72rem;
  margin: 4px 0 0;
}

/* ---------------------------- canvas ---------------------------- */

#bandCanvas {
  display: block;
  width: 100%;
  height: 120px;
  background: #04060b;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 14px;
}

/* ---------------------------- footer ---------------------------- */

.rack-footer {
  max-width: 900px;
  margin: 24px auto 0;
  text-align: center;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--steel-dim);
}

@media (max-width: 560px) {
  .rack { grid-template-columns: 1fr; }
  .brand { font-size: 2rem; }
}