:root {
  color-scheme: dark;
  --bg: radial-gradient(circle at top, #1f2933, #111827);
  --panel: rgba(17, 24, 39, 0.85);
  --accent: #60a5fa;
  --accent-strong: #2563eb;
  --grid-on: rgba(96, 165, 250, 0.9);
  --grid-off: rgba(30, 64, 175, 0.4);
  --text: #f9fafb;
  --muted: #9ca3af;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  align-items: stretch;
  justify-content: center;
  padding: 1.5rem;
}

#app {
  width: min(1200px, 100%);
  display: grid;
  grid-template-columns: 1fr clamp(260px, 30%, 360px);
  gap: 1.5rem;
}

@media (max-width: 900px) {
  #app {
    grid-template-columns: 1fr;
  }
}

.canvas-wrapper {
  position: relative;
  background: rgba(15, 23, 42, 0.6);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.35);
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  mix-blend-mode: screen;
  background: radial-gradient(circle at center, rgba(59, 130, 246, 0.15), transparent 55%);
}

.controls {
  backdrop-filter: blur(20px);
  background: var(--panel);
  border-radius: 18px;
  padding: 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
}

.controls h1 {
  margin: 0;
  font-size: 1.6rem;
  letter-spacing: 0.08em;
}

.section {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.section-title {
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

button,
select,
input[type="range"],
input[type="number"] {
  font: inherit;
  border: none;
  border-radius: 12px;
  padding: 0.65rem 0.85rem;
  background: rgba(30, 41, 59, 0.9);
  color: var(--text);
  transition: transform 120ms ease, background 180ms ease, box-shadow 180ms ease;
}

button {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-weight: 600;
}

button:hover {
  background: var(--accent);
  box-shadow: 0 12px 28px rgba(59, 130, 246, 0.35);
  transform: translateY(-1px);
}

button:active {
  transform: translateY(0);
  background: var(--accent-strong);
}

button[data-variant="ghost"] {
  background: transparent;
  color: var(--muted);
}

button[data-variant="ghost"]:hover {
  background: rgba(96, 165, 250, 0.1);
  color: var(--text);
  box-shadow: none;
}

.range-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--muted);
}

.range-label span:last-child {
  font-weight: 600;
  color: var(--text);
}

.slider {
  appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(148, 163, 184, 0.3);
  border-radius: 999px;
  outline: none;
  position: relative;
}

.slider::-webkit-slider-thumb {
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 6px 12px rgba(59, 130, 246, 0.35);
  cursor: pointer;
}

.slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 6px 12px rgba(59, 130, 246, 0.35);
  cursor: pointer;
}

.pattern-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 0.65rem;
}

.pattern-card {
  border-radius: 12px;
  padding: 0.75rem;
  border: 1px solid rgba(148, 163, 184, 0.2);
  background: rgba(15, 23, 42, 0.6);
  cursor: pointer;
  transition: transform 120ms ease, border-color 180ms ease, box-shadow 180ms ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.55rem;
}

.pattern-card:hover {
  border-color: rgba(96, 165, 250, 0.5);
  box-shadow: 0 12px 20px rgba(59, 130, 246, 0.25);
  transform: translateY(-2px);
}

.pattern-title {
  font-size: 0.85rem;
  text-align: center;
  margin-top: 0.4rem;
}

.pattern-preview {
  display: grid;
  width: 100%;
  gap: clamp(1px, 0.6vw, 3px);
}

.pattern-preview div {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 2px;
  background: rgba(96, 165, 250, 0.1);
  transition: background 160ms ease;
}

.pattern-preview div[data-live="true"] {
  background: var(--grid-on);
}

.checkbox-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.checkbox-row input {
  width: 1.05rem;
  height: 1.05rem;
}

.checkbox-row label {
  color: var(--muted);
  font-size: 0.9rem;
}

.footer {
  font-size: 0.78rem;
  color: var(--muted);
  text-align: center;
}
.buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(110px, 1fr));
  gap: 0.6rem;
}

.buttons button {
  width: 100%;
}

.input-pair {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}