:root {
  color-scheme: light dark;
  --bg: #14161c;
  --panel: #1e2129;
  --border: #2c303a;
  --text: #f2f3f5;
  --muted: #9aa0ab;
  --accent: #5b8cff;
  --error: #ff6b6b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  display: flex;
  justify-content: center;
  padding: 2.5rem 1.25rem;
}

.page {
  width: 100%;
  max-width: 960px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

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

.subtitle {
  margin: 0 0 0.5rem;
  color: var(--muted);
  text-align: center;
}

.controls {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: center;
  gap: 1rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem;
}

.controls label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.controls input[type="text"] {
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
  width: 9ch;
}

button {
  background: var(--accent);
  color: #0c1220;
  border: none;
  border-radius: 8px;
  padding: 0.65rem 1.4rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.15s ease;
}

button:hover:not(:disabled) {
  filter: brightness(1.1);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

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

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

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  max-width: 640px;
}

.canvas-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background-color: #1e2129;
  background-image:
    linear-gradient(45deg, #2c303a 25%, transparent 25%),
    linear-gradient(-45deg, #2c303a 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #2c303a 75%),
    linear-gradient(-45deg, transparent 75%, #2c303a 75%);
  background-size: 28px 28px;
  background-position: 0 0, 0 14px, 14px -14px, -14px 0px;
}

#preview {
  width: 100%;
  height: 100%;
  display: block;
}