/* Solutions Library — front-end layout */

.solib-layout {
	display: flex;
	gap: 32px;
	align-items: flex-start;
	max-width: 1200px;
	margin: 0 auto;
}

.solib-sidebar {
	flex: 0 0 260px;
	max-width: 260px;
}

.solib-cover img {
	width: 100%;
	height: auto;
	border-radius: 8px;
	box-shadow: 0 2px 10px rgba(0, 0, 0, 0.12);
	display: block;
}

.solib-book-title {
	font-size: 1.25rem;
	line-height: 1.3;
	margin: 16px 0 10px;
}

.solib-book-meta {
	list-style: none;
	margin: 0;
	padding: 0;
	font-size: 0.92rem;
	color: #444;
}

.solib-book-meta li {
	margin: 6px 0;
}

.solib-main {
	flex: 1 1 auto;
	min-width: 0;
}

.solib-selectors {
	display: flex;
	flex-wrap: wrap;
	gap: 20px;
	align-items: center;
	justify-content: flex-end;
	background: #f6f7f8;
	border: 1px solid #e3e5e8;
	border-radius: 8px;
	padding: 14px 18px;
	margin-bottom: 24px;
}

.solib-select-group {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	font-weight: 600;
}

.solib-select-group select {
	padding: 6px 10px;
	border-radius: 6px;
	border: 1px solid #c7ccd1;
	background: #fff;
	font-size: 0.95rem;
}

.solib-problem-head h2 {
	margin: 0 0 8px;
}

.solib-prompt {
	background: #fbfbfc;
	border: 1px solid #ececec;
	border-radius: 8px;
	padding: 14px 18px;
	margin-bottom: 20px;
}

.solib-solution-wrap h3 {
	border-bottom: 2px solid #eee;
	padding-bottom: 8px;
	margin-top: 8px;
}

.solib-solution {
	line-height: 1.7;
	overflow-x: auto;
}

.solib-solution p {
	margin: 0 0 1em;
}

.solib-browse {
	margin-top: 40px;
	border-top: 1px solid #eee;
	padding-top: 20px;
}

.solib-chapter-group {
	border: 1px solid #e6e8ea;
	border-radius: 6px;
	margin-bottom: 8px;
	padding: 6px 12px;
}

.solib-chapter-group summary {
	cursor: pointer;
	font-weight: 600;
	padding: 4px 0;
}

.solib-problem-list {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
	list-style: none;
	margin: 10px 0 6px;
	padding: 0;
}

.solib-problem-list a {
	display: inline-block;
	padding: 5px 12px;
	border: 1px solid #d4d8dc;
	border-radius: 999px;
	text-decoration: none;
	font-size: 0.9rem;
	color: #2b2f33;
	background: #fff;
}

.solib-problem-list a:hover {
	background: #eef3f8;
	border-color: #9fb6cc;
}

.solib-problem-list a.solib-active {
	background: #2c3e50;
	color: #fff;
	border-color: #2c3e50;
}

@media (max-width: 782px) {
	.solib-layout {
		flex-direction: column;
	}
	.solib-sidebar {
		flex-basis: auto;
		max-width: 320px;
		margin: 0 auto;
		text-align: center;
	}
	.solib-book-meta {
		text-align: left;
		display: inline-block;
	}
	.solib-selectors {
		justify-content: flex-start;
	}
}