/* =========================================================
   03-layout.css
   コンテナ / グリッド / セクション。
   ========================================================= */

.nt-container {
	width: 100%;
	max-width: var(--nt-container);
	margin-inline: auto;
	padding-inline: var(--nt-container-padding);
}

.nt-container--narrow {
	max-width: var(--nt-container-narrow);
}

.nt-container--wide {
	max-width: var(--nt-container-wide);
}

.nt-section {
	padding-block: var(--nt-section-y);
}

.nt-section--alt {
	background: var(--nt-color-surface);
}

.nt-stack > * + * {
	margin-top: var(--nt-stack);
}

.nt-stack-lg > * + * {
	margin-top: var(--nt-gap);
}

.nt-grid {
	display: grid;
	gap: var(--nt-gap);
}

.nt-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.nt-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.nt-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.nt-grid--auto {
	grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

@media (max-width: 900px) {
	.nt-grid--3,
	.nt-grid--4 {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}
}

@media (max-width: 600px) {
	.nt-grid--2,
	.nt-grid--3,
	.nt-grid--4 {
		grid-template-columns: 1fr;
	}
}

/* skip link */
.nt-skip-link {
	position: absolute;
	left: -9999px;
	top: 0;
	background: var(--nt-color-secondary);
	color: var(--nt-color-secondary-contrast);
	padding: 0.6em 1em;
	border-radius: var(--nt-radius-sm);
	z-index: var(--nt-z-modal);
	text-decoration: none;
}

.nt-skip-link:focus {
	left: 8px;
	top: 8px;
}

/* main */
.nt-main {
	display: block;
	min-height: 60vh;
}

/* article layout */
.nt-article {
	max-width: var(--nt-container-narrow);
	margin-inline: auto;
}

.nt-article-content > * + * {
	margin-top: 1.25em;
}

.nt-article-content h2 {
	margin-top: 2em;
}

.nt-article-content h3 {
	margin-top: 1.5em;
}

.nt-article-content img {
	border-radius: var(--nt-radius-md);
}

/* sidebar layout (将来用) */
.nt-with-sidebar {
	display: grid;
	gap: var(--nt-gap);
	grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 960px) {
	.nt-has-sidebar .nt-with-sidebar {
		grid-template-columns: minmax(0, 1fr) 280px;
	}
}