/*
 * 404 — nhân vật clapperboard, giữ góc vuông brand nhưng biểu cảm dễ thương.
 * Mọi animation tự tắt khi user bật reduced-motion.
 */

.error-404 {
	padding-top: clamp(6rem, 14vw, 10rem); /* chừa chỗ cho fixed header, co lại trên mobile */
	padding-bottom: var(--space-xl);
	text-align: center;
	display: flex;
	flex-direction: column;
	align-items: center;
	gap: var(--space-sm);
}

.error-404__art {
	position: relative;
	animation: nineg-float 4s ease-in-out infinite;
}

.error-404__art svg {
	max-width: 100%;
	height: auto;
	overflow: visible;
}

/* thanh gõ mở ra đóng vào — như đang "nói" */
.clap-stick {
	transform-origin: 34px 48px;
	animation: nineg-clap 3.2s ease-in-out infinite;
}

/* mắt chớp */
.eyes {
	transform-origin: center 113px;
	animation: nineg-blink 4.5s steps(1, end) infinite;
}

.film-strip {
	animation: nineg-float 5s ease-in-out infinite reverse;
}

@keyframes nineg-clap {
	0%, 70%, 100% { transform: rotate(0deg); }
	78%           { transform: rotate(-14deg); }
	86%           { transform: rotate(0deg); }
}

@keyframes nineg-blink {
	0%, 92%, 100% { transform: scaleY(1); }
	95%           { transform: scaleY(0.12); }
}

@keyframes nineg-float {
	0%, 100% { transform: translateY(0); }
	50%      { transform: translateY(-8px); }
}

.error-404__code {
	margin: var(--space-sm) 0 0;
	font-family: var(--font-display);
	font-stretch: var(--font-stretch-display);
	font-weight: 800;
	font-size: clamp(3.5rem, 12vw, 7rem);
	line-height: 0.9;
	color: transparent;
	-webkit-text-stroke: 1px rgba(var(--color-gold-rgb), 0.5);
	user-select: none;
}

@supports not (-webkit-text-stroke: 1px black) {
	.error-404__code {
		color: rgba(var(--color-gold-rgb), 0.3);
	}
}

.error-404__title {
	margin: 0;
	max-width: 20ch;
}

.error-404__text {
	max-width: 46ch;
	margin: 0;
}

.error-404__search {
	width: min(420px, 100%);
	margin-top: var(--space-sm);
}

.error-404__links {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: var(--space-xs);
	margin-top: var(--space-sm);
}

.error-404__link {
	padding: var(--space-xs) var(--space-sm);
	border: 1px solid var(--color-border);
	font-size: var(--fs-small);
	color: var(--color-text-muted);
	text-transform: uppercase;
	letter-spacing: 0.08em;
	transition: border-color var(--transition-base), color var(--transition-base);
}

.error-404__link:hover,
.error-404__link:focus-visible {
	border-color: var(--color-gold);
	color: var(--color-gold);
}

@media (prefers-reduced-motion: reduce) {
	.error-404__art,
	.clap-stick,
	.eyes,
	.film-strip {
		animation: none;
	}
}