* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
	overflow: hidden;
	transition: background-color 0.6s ease;
}

/* ── Theme Switcher ─────────────────────────────── */
#theme-switcher {
	position: fixed;
	top: 12px;
	right: 12px;
	z-index: 1000;
	display: flex;
	gap: 6px;
	align-items: center;
}

.theme-btn {
	width: 28px;
	height: 28px;
	border-radius: 50%;
	border: 3px solid rgba(255,255,255,0.8);
	cursor: pointer;
	transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
	box-shadow: 0 2px 6px rgba(0,0,0,0.3);
	outline: none;
}

.theme-btn:hover {
	transform: scale(1.15);
	border-color: #fff;
	box-shadow: 0 3px 10px rgba(0,0,0,0.45);
}

.theme-btn.active {
	border-color: #fff;
	box-shadow: 0 0 0 2px rgba(255,255,255,0.5), 0 3px 10px rgba(0,0,0,0.4);
	transform: scale(1.1);
}

/* ── Colour swatches ─────────────────────────────── */
.theme-btn[data-theme="default"] { background: linear-gradient(135deg, #4488aa 0%, #43a9df 100%); }
.theme-btn[data-theme="dark"]    { background: linear-gradient(135deg, #0a0e1a 0%, #1a2a4a 100%); }
.theme-btn[data-theme="sunset"]  { background: linear-gradient(135deg, #c0392b 0%, #f39c12 100%); }
.theme-btn[data-theme="storm"]   { background: linear-gradient(135deg, #2c3e50 0%, #4a5568 100%); }
.theme-btn[data-theme="dawn"]    { background: linear-gradient(135deg, #6a3093 0%, #a044ff 50%, #ff7b54 100%); }
.theme-btn[data-theme="golden"]  { background: linear-gradient(135deg, #b8860b 0%, #ffd700 100%); }
.theme-btn[data-theme="arctic"]  { background: linear-gradient(135deg, #b8d4e8 0%, #eef6ff 100%); }

/* ── Theme Label ───────────────────────────────── */
#theme-label {
	position: fixed;
	bottom: 12px;
	right: 12px;
	padding: 3px 10px;
	border-radius: 4px;
	font-family: sans-serif;
	font-size: 12px;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	border: 1px solid;
	opacity: 0.85;
	z-index: 1000;
	pointer-events: none;
	transition: background 0.3s, color 0.3s;
}

/* ── Dark theme canvas filter ──────────────────── */
body.theme-dark #PIclouds canvas {
	filter: brightness(0.82) saturate(0.6) hue-rotate(200deg);
}

/* ── Arctic theme canvas filter ─────────────────── */
body.theme-arctic #PIclouds canvas {
	filter: brightness(1.05) saturate(0.55) hue-rotate(185deg);
}