/* M15 — Bouton magnétique (Atelier WP, 09/10/2026). */
.m15 { position: relative; isolation: isolate; overflow: hidden; transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1), background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease; }
.m15:hover { transition: transform 0.12s linear, background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease; }
.m15-lueur {
	position: absolute; inset: 0; z-index: -1; pointer-events: none; border-radius: inherit;
	background: radial-gradient(circle 90px at var(--m15-x, 50%) var(--m15-y, 50%), color-mix(in srgb, currentColor 24%, transparent), transparent 70%);
	opacity: 0; transition: opacity 0.25s ease;
}
.m15:hover .m15-lueur { opacity: 1; }