:root {
  --bg: #f7f5f2;
  --panel: #ffffff;
  --ink: #2b2b2b;
  --muted: #6b6b6b;
  --accent: #8a5a44;
  --accent-ink: #ffffff;
  --border: #e2ddd6;
  --error: #b0413e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

.app {
  max-width: 880px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
}

.tagline {
  margin: 0 0 1.5rem;
  color: var(--muted);
}

.controls {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  display: grid;
  gap: 1.25rem;
}

.field {
  display: grid;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.field input {
  font: inherit;
  font-weight: 400;
  padding: 0.55rem 0.65rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
}

.field input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.dimensions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

button {
  font: inherit;
  font-weight: 600;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  cursor: pointer;
}

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

#download-btn {
  background: #fff;
  color: var(--accent);
}

.status {
  margin: 0;
  min-height: 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.status.error {
  color: var(--error);
}

.preview {
  margin-top: 1.5rem;
}

.preview-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 320px;
  padding: 1.5rem;
  background: repeating-conic-gradient(#eee 0 25%, #fff 0 50%) 50% / 24px 24px;
  border: 1px solid var(--border);
  border-radius: 12px;
}

.placeholder {
  color: var(--muted);
}