/* =============================================================
   Book reader — focused chapter-by-chapter reading view.
   Loaded only on the reader template.
   ============================================================= */

.reader {
	background: var(--background);
}

/* Reading progress */
.reader__progress {
	position: sticky;
	top: var(--header-h-compact);
	z-index: 90;
	height: 3px;
	background: transparent;
	margin-top: -3px;
}

.reader__progress span {
	display: block;
	width: 0;
	height: 100%;
	background: var(--red);
	transition: width 80ms linear;
}

/* Control bar */
.reader__bar {
	border-bottom: 1px solid var(--border);
	background: var(--surface);
}

.reader__bar-inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--sp-4);
	min-height: 3.1rem;
}

.reader__back {
	display: inline-flex;
	align-items: center;
	gap: 0.45em;
	font-family: var(--font-ui);
	font-size: var(--text-xs);
	font-weight: 700;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	text-decoration: none;
	color: var(--text-secondary);
	white-space: nowrap;
}
.reader__back svg { width: 1em; height: 1em; }
.reader__back:hover { color: var(--accent); }

.reader__bar-title {
	font-family: var(--font-display);
	font-size: var(--text-sm);
	font-weight: 780;
	letter-spacing: -0.01em;
	margin: 0;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.reader__lang {
	display: inline-flex;
	border: 1.5px solid var(--border);
	border-radius: var(--radius-sm);
	overflow: hidden;
}

.reader__lang a {
	display: inline-block;
	padding: 0.3rem 0.7rem;
	font-family: var(--font-ui);
	font-size: var(--text-xs);
	font-weight: 750;
	letter-spacing: 0.06em;
	text-decoration: none;
	color: var(--text-secondary);
}
.reader__lang a:hover { color: var(--text-primary); }
.reader__lang a.is-active {
	background: var(--text-primary);
	color: var(--background);
}

/* Layout */
.reader__layout {
	display: grid;
	grid-template-columns: 17rem minmax(0, 1fr);
	gap: clamp(1.5rem, 4vw, 4rem);
	padding-block: var(--sp-6) var(--sp-9);
	align-items: start;
}

/* Contents */
.reader__toc {
	position: sticky;
	top: calc(var(--header-h-compact) + 1.25rem);
	max-height: calc(100vh - var(--header-h-compact) - 2.5rem);
	overflow-y: auto;
	scrollbar-width: thin;
	padding-right: var(--sp-2);
}

.reader__toc-label {
	font-family: var(--font-ui);
	font-size: var(--text-xs);
	font-weight: 760;
	letter-spacing: 0.16em;
	text-transform: uppercase;
	color: var(--red);
	cursor: pointer;
	list-style: none;
	margin-bottom: var(--sp-3);
}
.reader__toc-details > summary::-webkit-details-marker { display: none; }

.reader__toc-list {
	list-style: none;
	margin: 0;
	padding: 0;
	border-top: 3px solid var(--border-strong);
}

.reader__toc-list li {
	border-bottom: 1px solid var(--border);
}

.reader__toc-list a {
	display: block;
	padding: 0.55rem 0.5rem 0.55rem 0.6rem;
	text-decoration: none;
	color: var(--text-secondary);
	transition: color var(--transition-fast), background-color var(--transition-fast);
}
.reader__toc-list a:hover { color: var(--text-primary); background: var(--surface-secondary); }

.reader__toc-kicker {
	display: block;
	font-family: var(--font-ui);
	font-size: 0.62rem;
	font-weight: 760;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--red);
}

.reader__toc-list a > span:last-child {
	font-family: var(--font-display);
	font-size: 0.82rem;
	font-weight: 660;
	line-height: 1.3;
}

.reader__toc-list li.is-current a {
	color: var(--text-primary);
	background: var(--surface);
	border-left: 3px solid var(--red);
	padding-left: calc(0.6rem - 3px);
}

/* Chapter */
.reader__article { max-width: 46rem; }

.reader__chapter-head {
	border-bottom: 1px solid var(--border);
	padding-bottom: var(--sp-5);
	margin-bottom: var(--sp-6);
}

.reader__chapter-title {
	font-size: clamp(1.7rem, 3.6vw, 2.6rem);
	font-weight: 850;
	letter-spacing: -0.022em;
	line-height: 1.05;
	margin: var(--sp-2) 0 var(--sp-3);
}

.reader__chapter-sub {
	font-family: var(--font-body);
	font-size: 1.1rem;
	font-style: italic;
	color: var(--text-secondary);
	margin: 0 0 var(--sp-3);
}

.reader__position {
	font-family: var(--font-ui);
	font-size: var(--text-xs);
	font-weight: 700;
	letter-spacing: 0.12em;
	color: var(--text-muted);
	margin: 0;
	font-variant-numeric: tabular-nums;
}

/* Prose */
.reader__prose {
	font-family: var(--font-body);
	font-size: clamp(1.06rem, 0.35vw + 1rem, 1.14rem);
	line-height: 1.8;
	color: var(--text-primary);
}

.reader__prose p { margin: 0 0 1.35em; }

/* Source-citation URLs can be very long — never let them force horizontal scroll */
.reader__prose {
	overflow-wrap: anywhere;
}

.reader__prose a {
	color: var(--accent);
	text-decoration: underline;
	text-decoration-thickness: 1px;
	word-break: break-all;
}
.reader__prose a:hover { color: var(--accent-hover); }

.reader__prose p:first-of-type::first-letter {
	font-family: var(--font-display);
	font-weight: 850;
	font-size: 3.2em;
	line-height: 0.82;
	float: left;
	padding: 0.06em 0.12em 0 0;
	color: var(--red);
}

.reader__prose h3 {
	font-size: 1.25rem;
	font-weight: 790;
	letter-spacing: -0.01em;
	border-left: 3px solid var(--red);
	padding-left: var(--sp-3);
	margin: 2em 0 0.8em;
}

/* Chapter nav */
.reader__nav {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: var(--sp-4);
	margin-top: var(--sp-8);
	border-top: 3px solid var(--border-strong);
	padding-top: var(--sp-5);
}

.reader__nav-card {
	display: flex;
	flex-direction: column;
	gap: 0.4rem;
	padding: var(--sp-4);
	border: 1.5px solid var(--border);
	border-radius: var(--radius-sm);
	text-decoration: none;
	color: var(--text-primary);
	transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}
.reader__nav-card:hover {
	border-color: var(--accent);
	color: var(--text-primary);
	transform: translateY(-2px);
	box-shadow: var(--shadow-sm);
}

.reader__nav-card--next { text-align: right; align-items: flex-end; }

.reader__nav-dir {
	font-family: var(--font-ui);
	font-size: var(--text-xs);
	font-weight: 750;
	letter-spacing: 0.1em;
	text-transform: uppercase;
	color: var(--red);
}

.reader__nav-title {
	font-family: var(--font-display);
	font-size: 0.95rem;
	font-weight: 720;
	line-height: 1.3;
}

/* Responsive */
@media (max-width: 900px) {
	.reader__layout { grid-template-columns: 1fr; }

	.reader__toc {
		position: static;
		max-height: none;
		overflow: visible;
		padding-right: 0;
	}

	.reader__toc-details:not([open]) .reader__toc-list { display: none; }
	.reader__toc-details { border-bottom: 1px solid var(--border); padding-bottom: var(--sp-3); }
	.reader__toc-label::after { content: ' ▾'; }

	.reader__bar-title { display: none; }

	.reader__nav { grid-template-columns: 1fr; }
	.reader__nav-card--next { text-align: left; align-items: flex-start; }
}