/* Chapter Post — reading UI (theme-agnostic).
   Themes restyle by overriding the CSS variables on .sc-reader, or any .sc-* rule. */
.sc-reader {
	--sc-accent: #2563eb;
	--sc-on-accent: #ffffff;
	--sc-panel-bg: #ffffff;
	--sc-text: #0f172a;
	--sc-muted: #64748b;
	--sc-border: #e6eaf0;
	--sc-active-bg: #eff4ff;
}

/* Top progress bar */
.sc-progress {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	height: 3px;
	background: transparent;
	z-index: 2147483000;
	pointer-events: none;
}
.sc-progress__bar {
	display: block;
	height: 100%;
	width: 0;
	background: var(--sc-accent);
	transition: width 0.08s linear;
}

/* In-content chapter heading (shown by un-integrated themes) */
.sc-chapter-heading { line-height: 1.15; }

/* Prev / next nav */
.sc-nav {
	display: flex;
	gap: 12px;
	flex-wrap: wrap;
	margin-top: 8px;
}
.sc-nav__link {
	flex: 1 1 220px;
	display: flex;
	flex-direction: column;
	gap: 2px;
	padding: 14px 18px;
	border: 1px solid var(--sc-border);
	border-radius: 12px;
	text-decoration: none;
	color: var(--sc-text);
	transition: border-color 0.15s, background 0.15s;
}
.sc-nav__link:hover { border-color: var(--sc-accent); background: var(--sc-active-bg); }
.sc-nav__next { text-align: right; }
.sc-nav__dir { font-size: 0.8em; font-weight: 700; color: var(--sc-accent); }
.sc-nav__title { color: var(--sc-muted); }

/* Floating toggle / FAB */
.sc-fab {
	position: fixed;
	right: 20px;
	bottom: 22px;
	z-index: 2147483000;
	display: inline-flex;
	align-items: center;
	gap: 8px;
	padding: 12px 18px;
	border: none;
	border-radius: 999px;
	background: var(--sc-accent);
	color: var(--sc-on-accent);
	font: 600 15px/1 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
	cursor: pointer;
	box-shadow: 0 8px 24px rgba(37, 99, 235, 0.35);
}
.sc-fab:hover { filter: brightness(1.05); }
.sc-fab__icon { display: inline-flex; }
.sc-fab__count { letter-spacing: 0.02em; }

/* TOC popup — a floating chat-box card anchored above the button (desktop) */
.sc-toc {
	position: fixed;
	right: 20px;
	bottom: 92px;
	width: 370px;
	max-width: calc(100vw - 40px);
	max-height: min(70vh, 560px);
	background: var(--sc-panel-bg);
	color: var(--sc-text);
	z-index: 2147483001;
	border: 1px solid var(--sc-border);
	border-radius: 16px;
	box-shadow: 0 20px 55px rgba(15, 23, 42, 0.28);
	transform: translateY(14px) scale(0.96);
	transform-origin: bottom right;
	opacity: 0;
	visibility: hidden;
	transition: opacity 0.18s ease, transform 0.2s cubic-bezier(0.22, 1, 0.36, 1);
	display: flex;
	flex-direction: column;
	overflow: hidden;
}
.sc-toc.is-open { opacity: 1; visibility: visible; transform: translateY(0) scale(1); }

.sc-toc__head {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 18px 20px;
	border-bottom: 1px solid var(--sc-border);
}
.sc-toc__book { color: var(--sc-accent); display: inline-flex; }
.sc-toc__post {
	flex: 1 1 auto;
	font-weight: 700;
	font-size: 15px;
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}
.sc-toc__close {
	flex: 0 0 auto;
	border: none;
	background: transparent;
	font-size: 26px;
	line-height: 1;
	cursor: pointer;
	color: var(--sc-muted);
}
.sc-toc__label {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 14px 20px 8px;
	font-size: 12px;
	font-weight: 700;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--sc-muted);
}
.sc-toc__total {
	background: var(--sc-active-bg);
	color: var(--sc-accent);
	border-radius: 999px;
	padding: 2px 9px;
	font-size: 12px;
}
.sc-toc__list {
	list-style: none;
	margin: 0;
	padding: 0 10px 24px;
	overflow-y: auto;
	flex: 1 1 auto;
}
.sc-toc__link {
	display: flex;
	align-items: center;
	gap: 12px;
	padding: 12px 12px;
	border-radius: 10px;
	text-decoration: none;
	color: var(--sc-text);
	transition: background 0.15s;
}
.sc-toc__link:hover { background: var(--sc-active-bg); }
.sc-toc__item.is-active .sc-toc__link { background: var(--sc-active-bg); }
.sc-toc__num {
	flex: 0 0 auto;
	width: 34px;
	height: 34px;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	border-radius: 999px;
	background: #f1f5f9;
	color: var(--sc-muted);
	font-weight: 700;
	font-size: 13px;
}
.sc-toc__item.is-active .sc-toc__num { background: var(--sc-accent); color: var(--sc-on-accent); }
.sc-toc__text {
	font-size: 14px;
	font-weight: 600;
	line-height: 1.3;
	overflow: hidden;
	display: -webkit-box;
	-webkit-line-clamp: 2;
	-webkit-box-orient: vertical;
}

/* Click-catcher. Transparent on desktop (chat-box style, page stays visible);
   dimmed on mobile where the popup becomes a bottom sheet. */
.sc-reader__overlay {
	position: fixed;
	inset: 0;
	background: transparent;
	z-index: 2147483000;
	opacity: 0;
	transition: opacity 0.2s;
}
.sc-reader__overlay.is-open { opacity: 1; }

@media (max-width: 640px) {
	.sc-toc {
		right: 0;
		left: 0;
		bottom: 0;
		width: 100%;
		max-width: 100%;
		max-height: 82vh;
		border-radius: 18px 18px 0 0;
		border-left: 0;
		border-right: 0;
		border-bottom: 0;
		transform: translateY(100%) scale(1);
		transform-origin: bottom center;
	}
	.sc-toc.is-open { transform: translateY(0) scale(1); }
	.sc-reader__overlay { background: rgba(15, 23, 42, 0.45); }
}