:root {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #0f172a;
  color: #e5e7eb;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.app {
  width: min(1100px, 100%);
  margin: 1.5rem;
  background: radial-gradient(circle at top left, #1e293b, #020617);
  border-radius: 1.5rem;
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.7);
  padding: 1.75rem;
  box-sizing: border-box;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.app-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.app-subtitle {
  font-size: 0.9rem;
  color: #9ca3af;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  align-items: center;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.8rem;
}

.control-group label {
  color: #9ca3af;
}

input[type="file"] {
  font-size: 0.8rem;
  color: #e5e7eb;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.8);
  padding: 0.25rem 0.75rem;
  cursor: pointer;
}

/* Modern browsers */
input[type="file"]::file-selector-button {
  border: none;
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  margin-right: 0.5rem;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  color: #0f172a;
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.08s ease;
}

/* WebKit (Safari/old Chrome) */
input[type="file"]::-webkit-file-upload-button {
  border: none;
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  margin-right: 0.5rem;
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  color: #0f172a;
  font-weight: 600;
  font-size: 0.8rem;
  cursor: pointer;
  transition: filter 0.15s ease, transform 0.08s ease;
}

input[type="file"]::file-selector-button:hover,
input[type="file"]::-webkit-file-upload-button:hover {
  filter: brightness(1.05);
  transform: translateY(-1px);
}


select, button {
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.8);
  color: #e5e7eb;
  font-size: 0.85rem;
  padding: 0.45rem 0.9rem;
  outline: none;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.08s ease;
}

select:focus-visible, button:focus-visible {
  border-color: #38bdf8;
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.5);
}

button:hover {
  background: rgba(15, 23, 42, 0.95);
  transform: translateY(-1px);
}

button.primary {
  background: linear-gradient(135deg, #38bdf8, #818cf8);
  border-color: transparent;
  font-weight: 600;
  color: #0f172a;
}

button.primary:hover {
  filter: brightness(1.05);
}

button:disabled {
  opacity: 0.4;
  cursor: default;
  transform: none;
}

.canvases {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  margin-top: 0.75rem;
}

.panel {
  background: rgba(15, 23, 42, 0.9);
  border-radius: 1.1rem;
  border: 1px solid rgba(148, 163, 184, 0.3);
  padding: 0.8rem;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 300px;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.8rem;
  color: #9ca3af;
}

.panel-header span.title {
  font-weight: 600;
  color: #e5e7eb;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  font-size: 0.75rem;
}

.panel-body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.75rem;
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 1));
  overflow: hidden;
}

canvas {
  max-width: 100%;
  max-height: 100%;
  image-rendering: pixelated;
}

.hint {
  font-size: 0.75rem;
  color: #6b7280;
  margin-top: 0.6rem;
}

@media (max-width: 800px) {
  .canvases {
    grid-template-columns: 1fr;
  }
}