/**
 * Reading series: the banner on a post, and the series page.
 */

/* ---------- banner on a post ---------- */
.em-series {
	border: 1px solid var(--em-border);
	border-radius: 0.6rem;
	background: var(--em-bg-card);
	padding: 1.1rem 1.25rem;
	margin: 0 0 2rem;
}

.em-series-head {
	display: flex;
	align-items: baseline;
	justify-content: space-between;
	gap: 1rem;
	flex-wrap: wrap;
}

.em-series-name {
	font-family: 'Plus Jakarta Sans', system-ui, sans-serif;
	font-weight: 700;
	font-size: 1rem;
	color: var(--em-text);
	text-decoration: none;
}

.em-series-name:hover,
.em-series-name:focus-visible {
	color: var(--em-primary);
}

.em-series-count {
	font-family: 'JetBrains Mono', ui-monospace, monospace;
	font-size: 0.72rem;
	letter-spacing: 0.05em;
	text-transform: uppercase;
	color: var(--em-muted);
	white-space: nowrap;
}

.em-series-bar {
	height: 3px;
	border-radius: 2px;
	background: var(--em-bg-2);
	margin: 0.75rem 0 0.9rem;
	overflow: hidden;
}

.em-series-bar-fill {
	display: block;
	height: 100%;
	background: var(--em-primary);
}

.em-series-parts summary {
	cursor: pointer;
	font-size: 0.86rem;
	color: var(--em-muted);
	list-style: none;
}

.em-series-parts summary::-webkit-details-marker { display: none; }

.em-series-parts summary::before {
	content: "▸";
	display: inline-block;
	margin-inline-end: 0.4rem;
	transition: transform 0.15s ease;
}

.em-series-parts[open] summary::before { transform: rotate(90deg); }

.em-series-parts summary:hover,
.em-series-parts summary:focus-visible { color: var(--em-primary); }

.em-series-parts ol {
	margin: 0.85rem 0 0;
	padding-inline-start: 1.5rem;
	display: flex;
	flex-direction: column;
	gap: 0.45rem;
	font-size: 0.9rem;
}

.em-series-parts li::marker { color: var(--em-muted); font-variant-numeric: tabular-nums; }
.em-series-parts a { color: var(--em-muted); text-decoration: none; }
.em-series-parts a:hover,
.em-series-parts a:focus-visible { color: var(--em-primary); }
.em-series-parts li.is-current { color: var(--em-text); font-weight: 600; }

/* prev / next inside the series */
.em-series-steps {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 0.75rem;
	margin-top: 1rem;
	padding-top: 1rem;
	border-top: 1px solid var(--em-border);
}

.em-series-step {
	display: flex;
	flex-direction: column;
	gap: 0.15rem;
	text-decoration: none;
	color: inherit;
	min-width: 0;
}

.em-series-next { text-align: end; }

.em-series-step-label {
	font-family: 'JetBrains Mono', ui-monospace, monospace;
	font-size: 0.68rem;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	color: var(--em-muted);
}

.em-series-step-title {
	font-size: 0.88rem;
	line-height: 1.35;
	color: var(--em-text);
	overflow: hidden;
	display: -webkit-box;
	-webkit-line-clamp: 2;
	-webkit-box-orient: vertical;
}

.em-series-step:hover .em-series-step-title,
.em-series-step:focus-visible .em-series-step-title { color: var(--em-primary); }

/* ---------- the series page ---------- */
.em-series-lede { max-width: 62ch; }
.em-series-start { margin-top: 1.25rem; }

.em-series-list {
	list-style: none;
	margin: 0;
	padding: 0;
	border-block: 1px solid var(--em-border);
}

.em-series-item + .em-series-item { border-top: 1px solid var(--em-border); }

.em-series-item a {
	display: grid;
	grid-template-columns: 2.5rem 1fr;
	gap: 1rem;
	padding: 1.15rem 0;
	text-decoration: none;
	color: inherit;
	align-items: start;
}

.em-series-item-num {
	font-family: 'JetBrains Mono', ui-monospace, monospace;
	font-size: 1rem;
	font-variant-numeric: tabular-nums;
	color: var(--em-muted);
	padding-top: 0.1rem;
}

.em-series-item-body { min-width: 0; display: block; }

.em-series-item-title {
	display: block;
	font-size: 1.06rem;
	line-height: 1.35;
	color: var(--em-text);
	margin-bottom: 0.25rem;
}

.em-series-item-excerpt {
	display: block;
	font-size: 0.9rem;
	line-height: 1.55;
	color: var(--em-muted);
	max-width: 68ch;
}

.em-series-item a:hover .em-series-item-title,
.em-series-item a:focus-visible .em-series-item-title { color: var(--em-primary); }

.em-series-item a:hover .em-series-item-num,
.em-series-item a:focus-visible .em-series-item-num { color: var(--em-primary); }

@media (max-width: 560px) {
	.em-series-steps { grid-template-columns: 1fr; }
	.em-series-next { text-align: start; }
	.em-series-item a { grid-template-columns: 2rem 1fr; gap: 0.75rem; }
}

@media (prefers-reduced-motion: reduce) {
	.em-series-parts summary::before { transition: none; }
}

/* ---------- series cards (home page, category archives) ---------- */
.em-series-grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
	gap: 1rem;
	margin: 0;
}

/* The home page shows eight, so the wide layout is pinned to four columns:
   auto-fill lands on three at some widths, which leaves two cards stranded
   on a third row. */
@media (min-width: 1024px) {
	.em-series-grid {
		grid-template-columns: repeat(4, minmax(0, 1fr));
	}
}

.em-series-card {
	display: flex;
	flex-direction: column;
	gap: 0.4rem;
	padding: 1.15rem 1.25rem;
	border: 1px solid var(--em-border);
	border-radius: 0.5rem;
	background: var(--em-bg-card);
	text-decoration: none;
	color: inherit;
	transition: border-color 0.15s ease, transform 0.15s ease;
}

.em-series-card:hover,
.em-series-card:focus-visible {
	border-color: var(--em-primary);
	transform: translateY(-2px);
}

.em-series-card-count {
	font-family: 'JetBrains Mono', ui-monospace, monospace;
	font-size: 0.68rem;
	letter-spacing: 0.07em;
	text-transform: uppercase;
	color: var(--em-primary);
}

.em-series-card-name {
	font-size: 1.05rem;
	line-height: 1.3;
	color: var(--em-text);
}

.em-series-card-first {
	font-size: 0.86rem;
	line-height: 1.5;
	color: var(--em-muted);
}

@media (prefers-reduced-motion: reduce) {
	.em-series-card { transition: none; }
}

/* ---------- icon on the series card ---------- */
.em-series-card-top {
	display: flex;
	align-items: center;
	gap: 0.45rem;
	color: var(--em-primary);
}

.em-series-card-top .em-icon {
	opacity: 0.9;
}

/* ---------- step number on the index ---------- */
.em-series-card-step {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-width: 1.5rem;
	height: 1.5rem;
	padding-inline: 0.35rem;
	border-radius: 999px;
	background: var(--em-primary);
	color: var(--em-on-primary);
	font-family: 'JetBrains Mono', ui-monospace, monospace;
	font-size: 0.72rem;
	font-weight: 600;
	font-variant-numeric: tabular-nums;
	flex: 0 0 auto;
}