:root {
  --bg: #0d0d0d;
  --card: #1a1a1a;
  --card-light: #222;
  --border: #2a2a2a;
  --text: #e0e0e0;
  --muted: #777;
  --accent: #e8732c;
  --accent-hover: #f08440;
  --accent-dim: #c4601f;
  --success: #4caf50;
  --error: #f44336;
  --radius: 10px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* Header */
header {
  text-align: center;
  padding: 32px 20px 16px;
  border-bottom: 1px solid var(--border);
}
header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.subtitle {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 4px;
}
.status {
  display: inline-block;
  margin-top: 12px;
  padding: 4px 14px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--card-light);
  color: var(--muted);
}
.status.loading { background: #2a2520; color: #e8b84c; }
.status.ready   { background: #1a3020; color: var(--success); }
.status.error   { background: #2a1a1a; color: var(--error); }

/* Layout */
main {
  display: flex;
  gap: 24px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px 20px;
}
.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}
.controls {
  width: 340px;
  flex-shrink: 0;
  align-self: flex-start;
  position: sticky;
  top: 24px;
}
.results {
  flex: 1;
  min-width: 0;
}

/* Upload zone */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.upload-zone:hover, .upload-zone.dragover {
  border-color: var(--accent);
  background: rgba(232, 115, 44, 0.05);
}
.upload-icon { font-size: 2.5rem; margin-bottom: 8px; }
.upload-zone p { color: var(--muted); font-size: 0.9rem; }
.muted { font-size: 0.8rem; opacity: 0.7; }

/* Source preview */
.source-preview h3, .params h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 12px;
}
.source-preview img {
  width: 100%;
  border-radius: 6px;
  border: 1px solid var(--border);
  margin-bottom: 12px;
}

/* Parameters */
.params { margin-top: 24px; }
.param-row {
  display: block;
  margin-bottom: 18px;
}
.param-label {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 6px;
}
.param-label small {
  color: var(--muted);
  font-weight: normal;
}
.param-control {
  display: flex;
  align-items: center;
  gap: 10px;
}
.param-control input[type="range"] {
  flex: 1;
  accent-color: var(--accent);
  height: 4px;
}
.param-value {
  min-width: 36px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--accent);
}

/* Buttons */
.btn-primary, .btn-secondary {
  display: block;
  width: 100%;
  padding: 12px 20px;
  border: none;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  margin-top: 24px;
}
.btn-primary:hover:not(:disabled) { background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary.btn-wide { margin-top: 20px; }
.btn-secondary {
  background: var(--card-light);
  color: var(--text);
  border: 1px solid var(--border);
  font-size: 0.85rem;
}
.btn-secondary:hover { background: var(--border); }

/* Loading */
.loading-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  color: var(--muted);
}
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--muted);
}
.empty-icon { font-size: 3rem; margin-bottom: 12px; }

/* Reduced preview */
.reduced-preview {
  margin-bottom: 24px;
}
.reduced-preview h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 10px;
}
.reduced-preview img {
  max-width: 100%;
  border-radius: 6px;
  border: 1px solid var(--border);
}

/* Layer cards */
.layer-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}
.layer-card {
  background: var(--card-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.layer-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  gap: 8px;
}
.layer-info {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
}
.color-swatch {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1px solid rgba(255,255,255,0.15);
  flex-shrink: 0;
}
.color-rgb {
  font-size: 0.75rem;
  color: var(--muted);
  font-weight: normal;
}
.download-btn {
  padding: 6px 12px;
  background: var(--accent-dim);
  color: #fff;
  border: none;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
}
.download-btn:hover { background: var(--accent); }
.layer-card-preview {
  padding: 12px;
  background: #0a0a0a;
  display: flex;
  justify-content: center;
}
.layer-card-preview svg {
  width: 100%;
  max-width: 250px;
  height: auto;
}
.layer-card-footer {
  padding: 8px 14px;
  font-size: 0.78rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}

/* Paywall */
.paywall {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
  padding: 16px 20px;
  background: rgba(232, 115, 44, 0.08);
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius);
}
.paywall p { color: var(--muted); font-size: 0.85rem; margin-top: 2px; }
.paywall .btn-primary { width: auto; margin-top: 0; white-space: nowrap; }
@media (max-width: 768px) {
  .paywall { flex-direction: column; align-items: stretch; }
  .paywall .btn-primary { width: 100%; }
}

/* Footer */
footer {
  text-align: center;
  padding: 24px 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.8rem;
}
footer a { color: var(--accent); text-decoration: none; }

/* Utilities */
.hidden { display: none !important; }

/* Responsive */
@media (max-width: 768px) {
  main { flex-direction: column; padding: 16px; }
  .controls { width: 100%; position: static; }
  .layer-cards { grid-template-columns: 1fr; }
}