:root {
	--bg: #0f1720;
	--text: #e6eef7;
	--muted: #94a3b8;
	--accent: #7dd3fc;
	--accent-2: #a78bfa;
}

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

body {
	font-family: Arial, Helvetica, sans-serif;
	background: linear-gradient(160deg, #0f1720, #1e293b);
	color: var(--text);
	min-height: 100vh;
	display: flex;
	justify-content: center;
	align-items: center;
	text-align: center;
	padding: 20px;
	transition: background 0.4s ease, color 0.4s ease;
}

/* version claire */
body.light {
	--bg: #f8fafc;
	--text: #1e293b;
	--muted: #475569;
	--accent: #2563eb;
	--accent-2: #9333ea;
	background: linear-gradient(160deg, #f8fafc, #e2e8f0);
	color: var(--text);
}

/* bouton toggle */
.theme-toggle {
	position: fixed;
	top: 16px;
	right: 16px;
	width: 42px;
	height: 42px;
	border-radius: 50%;
	background: rgba(255,255,255,0.1);
	backdrop-filter: blur(6px);
	display: flex;
	justify-content: center;
	align-items: center;
	cursor: pointer;
	font-size: 20px;
	transition: transform 0.3s ease, background 0.3s ease;
	border: 1px solid rgba(255,255,255,0.2);
}
.theme-toggle:hover {
	transform: rotate(20deg) scale(1.1);
	background: rgba(255,255,255,0.2);
}
.theme-toggle .icon {
	pointer-events: none;
}

/* contenu */
h1 {
	font-size: 2.2rem;
	color: var(--accent);
	text-shadow: 0 0 8px rgba(125,211,252,0.25);
	margin-bottom: 10px;
	transition: color 0.4s ease;
}
p {
	font-size: 1rem;
	color: var(--muted);
	transition: color 0.4s ease;
}

.card {
	background: rgba(255,255,255,0.03);
	padding: 25px 35px;
	border-radius: 16px;
	box-shadow: 0 8px 20px rgba(0,0,0,0.4);
	border: 1px solid rgba(255,255,255,0.05);
	backdrop-filter: blur(6px);
	transition: background 0.4s ease, box-shadow 0.4s ease, border 0.4s ease;
}

body.light .card {
	background: rgba(0,0,0,0.04);
	box-shadow: 0 8px 20px rgba(0,0,0,0.15);
	border: 1px solid rgba(0,0,0,0.05);
}

a.button {
	display: inline-block;
	margin-top: 18px;
	padding: 10px 18px;
	border-radius: 10px;
	background: linear-gradient(90deg, var(--accent), var(--accent-2));
	color: #fff;
	font-weight: bold;
	text-decoration: none;
	transition: transform 0.2s ease, background 0.4s ease;
}
a.button:hover {
	transform: translateY(-3px);
}