/*
 * Course sidebar navigation (from group.html .courses-nav-box).
 */

.mirinae-blog-sidebar {
	position: sticky;
	top: 80px;
	padding-top: 32px;
	min-width: 0;
}

.course-nav-card.courses-nav-box {
	background: var(--white);
	border: 1px solid var(--gray-border);
	border-radius: 12px;
	overflow: hidden;
	box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.courses-nav-header {
	background: var(--dark);
	padding: 20px 18px;
	color: var(--white);
}

.courses-nav-header .courses-nav-label {
	font-size: 10px;
	letter-spacing: 0.2em;
	color: var(--gold-light);
	margin-bottom: 4px;
}

.courses-nav-header .courses-nav-title {
	font-family: 'Noto Serif JP', serif;
	font-size: 18px;
	font-weight: 600;
}

.courses-nav { padding: 4px 0; }

.courses-nav .nav-group-title {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 10px 14px;
	color: var(--mid);
	font-size: 12px;
	font-weight: 500;
	cursor: pointer;
	transition: background 0.2s, color 0.2s;
	border: none;
	background: transparent;
	width: 100%;
	text-align: left;
	font-family: inherit;
}

.courses-nav .nav-group-title:hover {
	background: var(--gold-pale);
	color: var(--gold);
}

.courses-nav .nav-group.open .nav-group-title { color: var(--gold); }

.courses-nav .nav-chevron {
	width: 16px;
	height: 16px;
	border-radius: 50%;
	border: 1px solid var(--gray-border);
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 7px;
	color: var(--text-muted);
	transition: transform 0.25s ease;
	flex-shrink: 0;
}

.courses-nav .nav-group.open .nav-chevron {
	transform: rotate(180deg);
	border-color: var(--gold);
	background: var(--gold-pale);
	color: var(--gold);
}

.courses-nav .nav-items {
	display: grid;
	grid-template-rows: 0fr;
	transition: grid-template-rows 0.28s ease;
	overflow: hidden;
}

.courses-nav .nav-group.open .nav-items { grid-template-rows: 1fr; }

.courses-nav .nav-items-inner {
	overflow: hidden;
	background: var(--gold-pale);
	border-top: 1px solid rgba(184, 146, 62, 0.2);
}

.courses-nav .nav-item {
	display: flex;
	align-items: center;
	gap: 8px;
	padding: 8px 14px 8px 18px;
	font-size: 12px;
	color: var(--mid);
	text-decoration: none;
	transition: color 0.15s, background 0.15s;
	border-left: 2px solid transparent;
}

.courses-nav .nav-item::before {
	content: '';
	width: 4px;
	height: 4px;
	border-radius: 50%;
	background: var(--gray-border);
	flex-shrink: 0;
	transition: background 0.15s, transform 0.15s;
}

.courses-nav .nav-item:hover {
	color: var(--gold);
	background: rgba(255, 255, 255, 0.6);
	border-left-color: var(--gold);
}

.courses-nav .nav-item:hover::before {
	background: var(--gold);
	transform: scale(1.4);
}

.courses-nav .nav-item.active {
	color: var(--gold);
	border-left-color: var(--gold);
	background: rgba(255, 255, 255, 0.6);
	font-weight: 500;
}

.courses-nav .nav-item.active::before {
	background: var(--gold);
	transform: scale(1.5);
}

.courses-nav .nav-divider {
	height: 1px;
	background: var(--gray-border);
	margin: 0;
}

@media (max-width: 900px) {
	.mirinae-blog-sidebar {
		position: static;
		padding-top: 0;
	}
}