:root {
  --bg: #f7f5f2;
  --panel: #ffffff;
  --ink: #1a1a1a;
  --muted: #6b6b6b;
  --accent: #b5541e;
  --border: #ddd6cc;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
}

header {
  padding: 1.5rem 2rem 0.5rem;
}

header h1 {
  margin: 0;
  font-size: 1.4rem;
}

header p {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

header a {
  color: var(--accent);
}

main {
  display: grid;
  grid-template-columns: minmax(260px, 340px) 1fr;
  gap: 1.5rem;
  padding: 1.5rem 2rem 3rem;
  max-width: 1400px;
  margin: 0 auto;
}

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

#settings-panel,
#upload-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
}

#dropzone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 2rem 1rem;
  text-align: center;
  cursor: pointer;
  color: var(--muted);
}

#dropzone.dragover {
  border-color: var(--accent);
  color: var(--accent);
}

.field {
  margin-bottom: 1rem;
}

.field label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  margin-bottom: 0.35rem;
  color: var(--muted);
}

.field select,
.field input[type="range"] {
  width: 100%;
}

#export-btn {
  width: 100%;
  padding: 0.75rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  margin-top: 0.5rem;
}

#export-btn:disabled {
  background: var(--border);
  color: var(--muted);
  cursor: not-allowed;
}

#preview-panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 400px;
}

#preview-canvas {
  max-width: 100%;
  border: 1px solid var(--border);
  background: white;
}

#status {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.85rem;
}