/* --------------------------------------------------
 * FAQ page styles
 *
 * Mobile-first + nesting. All colors / font sizes use var(--as-*) tokens
 * declared in theme/assets/css/common.css.
 * -------------------------------------------------- */

.as-faq {
	width: 100%;
	background: var(--as-color-surface-blue-100);
	padding-block: 40px 80px;
}

/* --------------------------------------------------
 * Index nav
 * -------------------------------------------------- */

.as-faq .as-faq__index {
	margin: 0 auto 40px;
	padding-inline: var(--as-gutter);
}

.as-faq__index-list {
	display: flex;
	flex-wrap: wrap;
	gap: 12px;
	list-style: none;
	padding: 0;
	margin: 0;
	font-size: var(--as-font-size-md);
	letter-spacing: var(--as-letter-spacing-sm);
	color: var(--as-color-black);
}

.as-faq__index-item {
	display: inline-flex;
	align-items: center;
	gap: 12px;

	&:not(:last-child)::after {
		content: "/";
	}
}

.as-faq__index-link {
	color: inherit;
	text-decoration: none;

	@media (hover: hover) {
		&:hover {
			opacity: var(--as-hover-opacity);
		}
	}
}

@media (min-width: 769px) {
	.as-faq__index {
		margin-inline: auto;
		max-width: 750px;
		text-align: center;
	}

	.as-faq__index-list {
		justify-content: center;
	}
}

/* --------------------------------------------------
 * Groups
 * -------------------------------------------------- */

.as-faq .as-faq__groups {
	display: flex;
	flex-direction: column;
	gap: 73px;
	margin: 0 var(--as-gutter);
}

.as-faq__group {
	display: flex;
	flex-direction: column;
	gap: 24px;
}

.as-faq__group-heading {
	font-size: var(--as-font-size-xl);
	letter-spacing: var(--as-letter-spacing-lg);
	border-bottom: 1px solid currentColor;
	padding-bottom: 9px;
	margin: 0;
}

.as-faq__items {
	display: flex;
	flex-direction: column;
	gap: 32px;
	list-style: none;
	padding: 0;
	margin: 0;
}

/* --------------------------------------------------
 * Q&A item (details / summary)
 * -------------------------------------------------- */

.as-faq__item {
	display: flex;
	flex-direction: column;
	gap: 16px;
}

.as-faq__question {
	list-style: none; /* hide default disclosure triangle (Firefox/Chrome) */
	cursor: pointer;
	display: flex;
	justify-content: space-between;
	align-items: flex-start;
	gap: 16px;
	color: var(--as-color-gray-900);
	font-size: var(--as-font-size-base);
	letter-spacing: var(--as-letter-spacing-sm);
	line-height: var(--as-line-height-snug);

	&::-webkit-details-marker {
		display: none; /* hide default disclosure triangle (Safari) */
	}
}

.as-faq__answer {
	color: var(--as-color-gray-900);
	font-size: var(--as-font-size-xs);
	letter-spacing: var(--as-letter-spacing-sm);
	line-height: var(--as-line-height-loose);

	p {
		margin: 0 0 1em;

		&:last-child {
			margin-bottom: 0;
		}
	}

	a {
		color: inherit;
		text-decoration: underline;
	}
}

@media (min-width: 769px) {
	.as-faq .as-faq__groups {
		max-width: 750px;
		margin-inline: auto;
	}
}

/* --------------------------------------------------
 * Accordion icon (+ / −)
 * -------------------------------------------------- */

.as-faq__icon {
	flex-shrink: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	width: 1em;
	height: 1em;
	font-size: var(--as-font-size-md);
	letter-spacing: var(--as-letter-spacing-sm);
	color: var(--as-color-black);

	&::before {
		content: "+";
	}
}

.as-faq__item[open] .as-faq__icon::before {
	content: "−";
}

/* --------------------------------------------------
 * Accordion open / close animation (progressive enhancement)
 *
 * Uses interpolate-size + ::details-content. Browsers without support
 * fall back to instant open/close (no visual breakage).
 * -------------------------------------------------- */

@supports (interpolate-size: allow-keywords) {
	:root {
		interpolate-size: allow-keywords;
	}

	.as-faq__item::details-content {
		block-size: 0;
		overflow: clip;
		transition: block-size 0.3s ease, content-visibility 0.3s allow-discrete;
	}

	.as-faq__item[open]::details-content {
		block-size: auto;
	}

	@media (prefers-reduced-motion: reduce) {
		.as-faq__item::details-content {
			transition: none;
		}
	}
}

/* --------------------------------------------------
 * JA h2 global override neutralization
 *
 * style.css's `html[lang="ja"] h2` (0,0,1,2 + !important) sets 20px.
 * We need 18px per Figma spec; specificity 0,0,2,1 wins via the extra
 * .as-faq__group-heading class. See .claude/rules/ja-heading-css-overrides.md
 * -------------------------------------------------- */

html[lang="ja"] .as-faq__group-heading {
	font-size: var(--as-font-size-xl) !important;
}