:root {
  color-scheme: dark;
  --bg: #0b0d12;
  --bg-2: #11141c;
  --panel: #151924;
  --border: #232838;
  --text: #e8ecf5;
  --muted: #8b93a7;
  --accent: #6aa1ff;
  --accent-2: #a06aff;
  --danger: #ff6a8a;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 600px at 20% -10%, rgba(106, 161, 255, 0.12), transparent 60%),
    radial-gradient(900px 500px at 110% 10%, rgba(160, 106, 255, 0.10), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  background: rgba(11, 13, 18, 0.6);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 12px rgba(106, 161, 255, 0.4);
}

.ghlink {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.ghlink:hover { color: var(--text); border-color: #333c52; }

.app {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 20px;
  padding: 20px;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
}

.stage {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}

.canvas-wrap {
  position: relative;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  display: grid;
  place-items: center;
  aspect-ratio: 16 / 9;
  min-height: 280px;
}

#preview {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  background: #000;
}

.loading {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  gap: 10px;
  background: rgba(11, 13, 18, 0.6);
  backdrop-filter: blur(6px);
  color: var(--text);
  font-size: 14px;
}

.loading[hidden] { display: none; }

.spinner {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(255, 255, 255, 0.15);
  border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
  display: inline-block;
  margin-right: 8px;
  vertical-align: -4px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.stage-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.badge {
  font-size: 12px;
  letter-spacing: 0.3px;
  color: var(--muted);
  border: 1px solid var(--border);
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.02);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-self: start;
  position: sticky;
  top: 76px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.field label {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.2px;
  text-transform: uppercase;
}

.row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.row .x { color: var(--muted); }

input[type="number"],
select {
  flex: 1;
  min-width: 0;
  background: var(--bg-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

input[type="number"]:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(106, 161, 255, 0.18);
}

select {
  appearance: none;
  -webkit-appearance: none;
  background-image:
    linear-gradient(45deg, transparent 50%, var(--muted) 50%),
    linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 32px;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}
input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #fff;
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  padding: 4px 0;
}

.toggle input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.toggle-track {
  position: relative;
  display: inline-block;
  width: 38px;
  height: 22px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: background 0.15s, border-color 0.15s;
  flex-shrink: 0;
}

.toggle-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.4);
  transition: transform 0.15s;
}

.toggle input:checked + .toggle-track {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
}

.toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(16px);
}

.toggle input:focus-visible + .toggle-track {
  box-shadow: 0 0 0 3px rgba(106, 161, 255, 0.3);
}

.toggle-label {
  font-size: 14px;
  color: var(--text);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--bg-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 14px;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.05s ease, background 0.15s, border-color 0.15s;
}

.btn:hover { border-color: #3a4460; background: #1a1f2c; }
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  color: #0b0d12;
  font-weight: 600;
}
.btn-primary:hover { filter: brightness(1.05); background: linear-gradient(135deg, var(--accent), var(--accent-2)); }

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.actions .btn-primary {
  grid-column: 1 / -1;
}

.btn[disabled],
.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  filter: none;
}
.btn[disabled]:hover,
.btn[aria-disabled="true"]:hover {
  background: var(--bg-2);
  border-color: var(--border);
}

.anim-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.anim-warning {
  margin: 0;
  font-size: 12px;
  line-height: 1.45;
  color: var(--muted);
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-2);
  border-radius: 8px;
  background: rgba(160, 106, 255, 0.06);
}
.anim-warning[hidden] { display: none; }
.anim-warning.warn-strong {
  border-left-color: var(--danger);
  background: rgba(255, 106, 138, 0.06);
  color: var(--text);
}

.audio-file-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.audio-file-input {
  max-width: 140px;
  font-size: 12px;
}
.audio-file-name {
  font-size: 13px;
  color: var(--muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}
.btn-small {
  padding: 4px 10px;
  font-size: 12px;
}
.audio-controls {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 6px;
}
.audio-readout {
  float: right;
  color: var(--muted);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
.audio-transport {
  gap: 8px;
}

.anim-progress {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.anim-progress[hidden] { display: none; }

.anim-progress progress {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border: none;
  border-radius: 999px;
  overflow: hidden;
  background: var(--bg-2);
}
.anim-progress progress::-webkit-progress-bar {
  background: var(--bg-2);
  border-radius: 999px;
}
.anim-progress progress::-webkit-progress-value {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 999px;
  transition: width 0.15s;
}
.anim-progress progress::-moz-progress-bar {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 999px;
}

.anim-progress-label {
  font-size: 12px;
  color: var(--muted);
}

.tip {
  margin: 0;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.5;
}

.tip em { color: var(--text); font-style: normal; }

.footer {
  text-align: center;
  padding: 14px 20px;
  color: var(--muted);
  font-size: 12px;
  border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
    padding: 14px;
    gap: 14px;
  }
  .panel {
    position: static;
    top: auto;
  }
}

@media (max-width: 480px) {
  .topbar { padding: 12px 14px; }
  .brand-name { font-size: 15px; }
  .panel { padding: 14px; }
  .btn { padding: 12px 14px; } /* bigger tap targets */
}

/* Toast */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(20px);
  background: #1a1f2c;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 10px;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 20;
  font-size: 14px;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.palette-count-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
}

.palette-count-value {
  font-variant-numeric: tabular-nums;
  color: var(--text);
  font-size: 14px;
}

.palette-swatches {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.palette-swatches .swatch {
  width: 100%;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-2);
  padding: 2px;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.1s;
}

.palette-swatches .swatch:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.palette-swatches .swatch:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(106, 161, 255, 0.18);
}

.palette-swatches .swatch::-webkit-color-swatch-wrapper {
  padding: 0;
}
.palette-swatches .swatch::-webkit-color-swatch {
  border: none;
  border-radius: 8px;
}
.palette-swatches .swatch::-moz-color-swatch {
  border: none;
  border-radius: 8px;
}

.audio-source-toggle {
  display: flex;
  gap: 4px;
  margin-bottom: 10px;
}
.btn-toggle {
  flex: 1;
  padding: 6px 0;
  font-size: 12px;
  text-align: center;
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
}
.btn-toggle.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.instrument-toggles {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.instrument-toggles label {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  cursor: pointer;
}
.instrument-toggles input[type="checkbox"] {
  accent-color: var(--accent);
}