:root {
  --bg: #14161c;
  --panel: #1c1f28;
  --border: #2c303c;
  --text: #e8e9ee;
  --muted: #8b8fa3;
  --accent: #6ea8fe;
  --accent-hover: #8fbaff;
  --checker-a: #2a2d38;
  --checker-b: #22242d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: 1.5rem 2rem 0.5rem;
  text-align: center;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.6rem;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

main {
  flex: 1;
  display: grid;
  grid-template-columns: minmax(280px, 380px) 1fr;
  gap: 1.25rem;
  padding: 1.5rem 2rem;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

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

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  color: var(--muted);
  transition: border-color 0.15s, background 0.15s;
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--accent);
  background: rgba(110, 168, 254, 0.06);
}

.dropzone strong {
  color: var(--text);
}

.source-actions {
  display: flex;
  justify-content: center;
}

.source-thumb {
  max-width: 100%;
  max-height: 160px;
  border-radius: 8px;
  border: 1px solid var(--border);
  object-fit: contain;
  margin: 0 auto;
  display: block;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.field select,
.field input[type="number"] {
  background: #12141a;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 6px;
  padding: 0.45rem 0.5rem;
  font-size: 0.9rem;
}

.field.checkbox {
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
}

.field.checkbox input {
  width: 16px;
  height: 16px;
}

.field.inline {
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
}

#preview-panel {
  align-items: center;
  justify-content: center;
}

.preview-wrap {
  position: relative;
  flex: 1;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
}

#preview-canvas {
  image-rendering: pixelated;
  image-rendering: -moz-crisp-edges;
  border: 1px solid var(--border);
  background-image:
    linear-gradient(45deg, var(--checker-a) 25%, transparent 25%),
    linear-gradient(-45deg, var(--checker-a) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--checker-a) 75%),
    linear-gradient(-45deg, transparent 75%, var(--checker-a) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
  background-color: var(--checker-b);
}

#placeholder-text {
  position: absolute;
  color: var(--muted);
  font-size: 0.9rem;
}

.zoom-row,
.export-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.85rem;
  color: var(--muted);
  flex-wrap: wrap;
  justify-content: center;
}

.zoom-row input[type="range"] {
  flex: 1;
  max-width: 200px;
}

button {
  background: var(--accent);
  color: #10131a;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.1rem;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s;
}

button:hover:not(:disabled) {
  background: var(--accent-hover);
}

button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

button.secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

button.secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--accent);
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1rem;
}

.modal[hidden] {
  display: none;
}

.modal-content {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
  max-width: min(90vw, 560px);
}

#camera-video {
  width: 100%;
  max-width: 480px;
  border-radius: 8px;
  background: #000;
}

.camera-error {
  color: #ff8a8a;
  font-size: 0.85rem;
  text-align: center;
  margin: 0;
}

.modal-actions {
  display: flex;
  gap: 0.6rem;
}

footer {
  text-align: center;
  padding: 1rem;
  color: var(--muted);
  font-size: 0.8rem;
}