.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid color-mix(in srgb, var(--color_front) 25%, transparent);
  background: color-mix(in srgb, var(--color_midback) 60%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: var(--space-sm);
}

.brand__phi {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 600;
  color: var(--color_accent);
  line-height: 1;
}

.brand__title {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 500;
}

.brand__tag {
  font-size: 0.75rem;
  opacity: 0.7;
}

.header-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.app-main {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(320px, 1.2fr);
  gap: var(--space-lg);
  padding: var(--space-lg);
  max-width: 1400px;
  margin: 0 auto;
}

.panel {
  background: color-mix(in srgb, var(--color_midback) 50%, transparent);
  border: 1px solid color-mix(in srgb, var(--color_front) 20%, transparent);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.panel__title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: var(--space-md);
  color: var(--color_front);
}

.spiral-wrap {
  position: relative;
  aspect-ratio: 1;
  max-width: 420px;
  margin: 0 auto;
}

#spiral-canvas {
  width: 100%;
  height: 100%;
  cursor: crosshair;
  border-radius: 50%;
  background: radial-gradient(circle at center, color-mix(in srgb, var(--color_mid) 80%, transparent), var(--color_back));
  box-shadow: inset 0 0 40px color-mix(in srgb, var(--color_glow) 20%, transparent);
}

.spiral-hint {
  text-align: center;
  font-size: 0.8rem;
  opacity: 0.75;
  margin-top: var(--space-sm);
}

.controls-grid {
  display: grid;
  gap: var(--space-md);
}

.control-row {
  display: grid;
  grid-template-columns: 7rem 1fr 2.5rem;
  align-items: center;
  gap: var(--space-sm);
}

.control-row label {
  font-size: 0.85rem;
  font-weight: 500;
}

.control-row output,
.control-row .val {
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  text-align: right;
  opacity: 0.8;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--color_front) 30%, var(--color_mid));
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--color_accent);
  border: 2px solid var(--color_back);
  box-shadow: 0 0 8px var(--color_gloomy);
  cursor: pointer;
}

select, input[type="text"] {
  width: 100%;
  padding: 0.45rem 0.6rem;
  border-radius: var(--radius-sm);
  border: 1px solid color-mix(in srgb, var(--color_front) 35%, transparent);
  background: var(--color_back);
}

.lock-row {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
  font-size: 0.85rem;
}

.lock-row label {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.presets, .chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.chip {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--color_front) 30%, transparent);
  background: var(--color_mid);
  cursor: pointer;
  transition: background 0.2s, box-shadow 0.2s;
}

.chip:hover {
  background: var(--color_midfront);
  box-shadow: 0 0 12px var(--color_gloomy);
}

.btn {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-md);
  border: 1px solid color-mix(in srgb, var(--color_front) 30%, transparent);
  background: var(--color_mid);
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.2s;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--color_gloomy);
}

.btn--primary {
  background: var(--color_accent);
  color: var(--color_back);
  border-color: transparent;
  font-weight: 600;
}

.btn--ghost {
  background: transparent;
}

.palette-section {
  padding: var(--space-lg);
  max-width: 1400px;
  margin: 0 auto;
}

.palette-strip {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-sm);
}

.contrast-matrix {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--space-sm);
  margin-top: var(--space-md);
}

.matrix__cell {
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
  background: var(--color_midback);
  font-size: 0.75rem;
  display: grid;
  gap: 0.15rem;
}

.matrix__cell strong {
  font-size: 0.95rem;
}

.matrix__cell--aaa { border-left: 3px solid #3dd68c; }
.matrix__cell--aa { border-left: 3px solid #6eb5ff; }
.matrix__cell--aalarge { border-left: 3px solid #e8c468; }
.matrix__cell--fail { border-left: 3px solid #f07178; }

.saved-themes {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
  max-height: 160px;
  overflow-y: auto;
}

.saved-theme {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.saved-theme__load {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.35rem 0.5rem;
  border: none;
  background: var(--color_mid);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: left;
}

.saved-theme__dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--thumb, #888);
  flex-shrink: 0;
}

.saved-theme__delete {
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  opacity: 0.6;
}

.saved-theme__delete:hover {
  opacity: 1;
  background: color-mix(in srgb, var(--color_accent) 20%, transparent);
}

.upload-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-md);
  border: 1px dashed color-mix(in srgb, var(--color_front) 40%, transparent);
  cursor: pointer;
  font-size: 0.85rem;
}

.upload-label input {
  display: none;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
  z-index: 40;
}

.overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.export-drawer {
  position: fixed;
  right: 0;
  top: 0;
  bottom: 0;
  width: min(480px, 100vw);
  background: color-mix(in srgb, var(--color_midfront) 85%, var(--color_back));
  backdrop-filter: blur(12px);
  border-left: 1px solid color-mix(in srgb, var(--color_front) 25%, transparent);
  transform: translateX(100%);
  transition: transform 0.3s ease;
  z-index: 50;
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  gap: var(--space-md);
}

.export-drawer.open {
  transform: translateX(0);
}

.export-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

#export-preview {
  flex: 1;
  overflow: auto;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color_back);
  font-family: ui-monospace, monospace;
  font-size: 0.75rem;
  white-space: pre-wrap;
  word-break: break-all;
}

.toast {
  position: fixed;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  background: var(--color_front);
  color: var(--color_back);
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  font-size: 0.85rem;
  z-index: 60;
  transition: transform 0.3s ease;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

.onboarding {
  position: fixed;
  bottom: var(--space-xl);
  left: var(--space-lg);
  max-width: 320px;
  padding: var(--space-md);
  background: var(--color_midfront);
  border: 1px solid var(--color_accent);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px var(--color_gloomy);
  z-index: 30;
  transform: translateY(150%);
  transition: transform 0.4s ease;
}

.onboarding.show {
  transform: translateY(0);
}

.onboarding p {
  font-size: 0.9rem;
  margin-bottom: var(--space-sm);
}

.app-footer {
  text-align: center;
  padding: var(--space-lg);
  font-size: 0.8rem;
  opacity: 0.65;
}

.app-footer kbd {
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  background: var(--color_mid);
  font-size: 0.75rem;
}

@media (max-width: 900px) {
  .app-main {
    grid-template-columns: 1fr;
    padding: var(--space-md);
  }

  .spiral-wrap {
    max-width: 300px;
  }

  .control-row {
    grid-template-columns: 6rem 1fr 2rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}