/* ==========================================================================
   思路栈列表页筛选栏（分类 / 标签 / 排序）
   对应 template-parts/post/kb-filter-bar.php + inc/content/kb-filter.php
   ========================================================================== */

.kb-filter-bar {
	background: #fff;
	border: 1px solid #e8f0ff;
	border-radius: 12px;
	padding: 2px 16px;
	margin-bottom: 1rem;
}

.kb-filter-row {
	display: flex;
	align-items: flex-start;
	gap: 10px;
	padding: 9px 0;
}

.kb-filter-row + .kb-filter-row {
	border-top: 1px solid #f1f5f9;
}

.kb-filter-label {
	flex: 0 0 40px;
	font-size: 13px;
	line-height: 26px;
	color: #94a3b8;
	user-select: none;
}

.kb-filter-chips {
	display: flex;
	flex: 1 1 auto;
	flex-wrap: wrap;
	align-items: center;
	gap: 4px;
	min-width: 0;
}

.kb-filter-chip {
	display: inline-block;
	padding: 3px 11px;
	border-radius: 6px;
	font-size: 13px;
	line-height: 20px;
	color: #4b5563;
	text-decoration: none;
	white-space: nowrap;
	transition: background 0.15s ease, color 0.15s ease;
}

.kb-filter-chip:hover {
	background: #f5f7ff;
	color: #4a6cf7;
}

.kb-filter-chip.is-active {
	background: #eef2ff;
	color: #4a6cf7;
	font-weight: 600;
}

.kb-filter-chip.is-active:hover {
	background: #e3e9ff;
}

/* 有子分类的顶级分类：右侧加个小三角，暗示「还能再往下选」 */
.kb-filter-chip--has-children::after {
	content: '';
	display: inline-block;
	width: 0;
	height: 0;
	margin-left: 5px;
	vertical-align: 1px;
	border-left: 4px solid transparent;
	border-right: 4px solid transparent;
	border-top: 4px solid currentColor;
	opacity: 0.5;
}

/* 子分类正在生效时，父级显示半激活态：有主色但比选中项浅、不加粗 */
.kb-filter-chip.is-active-parent {
	background: #f5f7ff;
	color: #4a6cf7;
}

/* 第二级（子类）：浅底 + 缩进一档，与第一级形成层级感 */
.kb-filter-row--sub {
	background: #fafbff;
	border-radius: 8px;
	padding-left: 8px;
	padding-right: 8px;
}

.kb-filter-row--sub .kb-filter-label {
	color: #b3bfd4;
}

@media (max-width: 600px) {
	.kb-filter-bar {
		padding: 2px 12px;
		border-radius: 10px;
	}

	.kb-filter-label {
		flex-basis: 32px;
	}
}

/*
 * 窄屏兜底：正文栏被侧栏挤到很窄时，允许 chip 内部换行，
 * 免得整排标签横向溢出卡片。（页面本身在窄屏的表现是另一回事，见 README 备注。）
 */
@media (max-width: 640px) {
	.kb-filter-chip {
		max-width: 100%;
		white-space: normal;
		overflow-wrap: anywhere;
	}
}