/* ==========================================================================
   MASTER CHILD — UX CSS
   Breadcrumb, Author Box, Scroll Top, Progress Bar.
   design-system.css 변수 참조. 모바일 우선.
   ========================================================================== */


/* --------------------------------------------------------------------------
   1. READING PROGRESS BAR
   single post 전용. body 직후 fixed 라인.
   --progress CSS 변수를 JS에서 설정.
   -------------------------------------------------------------------------- */
.mc-progress-bar {
	position: fixed;
	top: 0;
	left: 0;
	width: var(--progress, 0%);
	height: 3px;
	background: linear-gradient(
		90deg,
		var(--color-primary-500) 0%,
		var(--color-accent-500) 100%
	);
	z-index: calc(var(--z-sticky) + 20);
	transition: width 0.1s linear;
	transform-origin: left;
	border-radius: 0 var(--radius-full) var(--radius-full) 0;
}


/* --------------------------------------------------------------------------
   2. STICKY HEADER — .scrolled 클래스 추가 시 강화
   layout.css에 이미 position:sticky 적용됨. JS가 .scrolled 클래스 추가.
   -------------------------------------------------------------------------- */
.site-header.scrolled {
	box-shadow: var(--shadow-sm);
	background-color: rgb(255 255 255 / 0.97);
	-webkit-backdrop-filter: blur(8px);
	backdrop-filter: blur(8px);
}


/* --------------------------------------------------------------------------
   3. BREADCRUMB
   -------------------------------------------------------------------------- */
.mc-breadcrumb {
	margin-bottom: var(--space-6);
	font-size: var(--text-xs);
}

.mc-breadcrumb__list {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 0;
	list-style: none;
	margin: 0;
	padding: 0;
}

.mc-breadcrumb__item {
	display: flex;
	align-items: center;
	min-width: 0; /* flex 오버플로 방지 */
}

.mc-breadcrumb__sep {
	color: var(--color-neutral-300);
	margin: 0 var(--space-2);
	flex-shrink: 0;
	font-size: var(--text-xs);
}

.mc-breadcrumb__link {
	display: inline-flex;
	align-items: center;
	gap: var(--space-1);
	color: var(--color-text-muted);
	text-decoration: none;
	white-space: nowrap;
	transition: color var(--duration-base) var(--ease-in-out);
}

.mc-breadcrumb__link:hover {
	color: var(--color-primary-600);
}

.mc-breadcrumb__link svg {
	flex-shrink: 0;
	color: var(--color-text-subtle);
}

.mc-breadcrumb__current {
	color: var(--color-text);
	font-weight: var(--font-medium);
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
	max-width: 24ch; /* 긴 제목 자동 말줄임 */
}

/* 아카이브 헤더와 Breadcrumb가 함께 있을 때 간격 */
.mc-breadcrumb + .mc-archive-header {
	margin-top: 0;
}


/* --------------------------------------------------------------------------
   4. AUTHOR BOX
   -------------------------------------------------------------------------- */
.mc-author-box {
	display: flex;
	flex-direction: column;
	gap: var(--space-5);
	padding: var(--space-6);
	background-color: var(--color-bg-subtle);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-2xl);
	margin-top: var(--space-10);
}

@media (min-width: 540px) {
	.mc-author-box {
		flex-direction: row;
		align-items: flex-start;
	}
}

.mc-author-box__avatar-wrap {
	flex-shrink: 0;
}

.mc-author-box__avatar {
	width: 80px;
	height: 80px;
	border-radius: var(--radius-full);
	border: 3px solid var(--color-neutral-0);
	box-shadow: var(--shadow-sm);
	display: block;
	object-fit: cover;
}

@media (min-width: 540px) {
	.mc-author-box__avatar {
		width: 96px;
		height: 96px;
	}
}

.mc-author-box__content {
	flex: 1;
	min-width: 0;
}

.mc-author-box__label {
	font-size: var(--text-xs);
	font-weight: var(--font-bold);
	letter-spacing: var(--tracking-widest);
	text-transform: uppercase;
	color: var(--color-primary-600);
	margin-bottom: var(--space-1);
}

.mc-author-box__name {
	display: block;
	font-size: var(--text-lg);
	font-weight: var(--font-bold);
	color: var(--color-text);
	text-decoration: none;
	margin-bottom: var(--space-3);
	transition: color var(--duration-base) var(--ease-in-out);
}

.mc-author-box__name:hover {
	color: var(--color-primary-600);
}

.mc-author-box__bio {
	font-size: var(--text-sm);
	color: var(--color-text-muted);
	line-height: var(--leading-relaxed);
	margin-bottom: var(--space-4);
}

.mc-author-box__links {
	display: flex;
	align-items: center;
	flex-wrap: wrap;
	gap: var(--space-3);
}

.mc-author-box__posts-link {
	display: inline-flex;
	align-items: center;
	gap: var(--space-1-5);
	font-size: var(--text-sm);
	font-weight: var(--font-semibold);
	color: var(--color-primary-600);
	text-decoration: none;
	transition: gap var(--duration-base) var(--ease-out),
	            color var(--duration-base) var(--ease-in-out);
}

.mc-author-box__posts-link:hover {
	color: var(--color-primary-800);
	gap: var(--space-2-5);
}

.mc-author-box__social-link {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 2rem;
	height: 2rem;
	border: 1.5px solid var(--color-border-strong);
	border-radius: var(--radius-full);
	color: var(--color-neutral-600);
	text-decoration: none;
	transition: var(--transition-colors), var(--transition-shadow);
}

.mc-author-box__social-link:hover {
	border-color: var(--color-primary-400);
	color: var(--color-primary-600);
	background-color: var(--color-primary-50);
}


/* --------------------------------------------------------------------------
   5. SCROLL TO TOP BUTTON
   -------------------------------------------------------------------------- */
.mc-scroll-top {
	position: fixed;
	bottom: var(--space-6);
	right: var(--space-5);
	z-index: var(--z-toast);

	width: 2.75rem;
	height: 2.75rem;
	display: flex;
	align-items: center;
	justify-content: center;

	background-color: var(--color-neutral-0);
	border: 1.5px solid var(--color-border-strong);
	border-radius: var(--radius-full);
	color: var(--color-neutral-700);
	cursor: pointer;
	box-shadow: var(--shadow-md);

	transition: background-color var(--duration-base) var(--ease-in-out),
	            color var(--duration-base) var(--ease-in-out),
	            border-color var(--duration-base) var(--ease-in-out),
	            box-shadow var(--duration-base) var(--ease-in-out),
	            transform var(--duration-base) var(--ease-out),
	            opacity var(--duration-slow) var(--ease-in-out);
}

.mc-scroll-top:hover {
	background-color: var(--color-primary-600);
	border-color: var(--color-primary-600);
	color: var(--color-neutral-0);
	box-shadow: var(--shadow-primary);
	transform: translateY(-2px);
}

.mc-scroll-top:active {
	transform: translateY(0);
}

/* hidden 속성 시 완전 숨김 */
.mc-scroll-top[hidden] {
	display: none;
}

@media (min-width: 1024px) {
	.mc-scroll-top {
		bottom: var(--space-8);
		right: var(--space-8);
	}
}


/* --------------------------------------------------------------------------
   6. BREADCRUMB + ARCHIVE HEADER 간격 조정
   이미 archive header가 존재할 때 breadcrumb과의 마진 조정
   -------------------------------------------------------------------------- */
.mc-archive-header {
	margin-top: 0;
}

/* single post에서 breadcrumb와 entry-header 사이 간격 */
.single-post .mc-breadcrumb {
	margin-bottom: var(--space-4);
}