.custom-md .m3-file-tree {
	margin: var(--m3e-space-6) 0;
	overflow-x: auto;
	border: 1px solid var(--outline-variant);
	border-radius: var(--shape-corner-l);
	background: var(--codeblock-bg);
	color: var(--on-surface);
	font: var(--m3e-type-code, var(--m3e-type-body-medium));
	font-family: var(--font-mono, var(--m3e-font-mono-fallback));
}

.custom-md .m3-file-tree__header {
	display: flex;
	align-items: center;
	gap: var(--m3e-space-1);
	min-height: calc(var(--m3e-space-8) + var(--m3e-space-1));
	padding: var(--m3e-space-1) var(--m3e-space-3);
	border-bottom: 1px solid var(--outline-variant);
	background: var(--codeblock-topbar-bg);
	color: var(--on-surface);
	font: var(--m3e-type-label-large);
}

.custom-md .m3-file-tree__title {
	min-width: 0;
	overflow-wrap: anywhere;
}

.custom-md .m3-file-tree__root,
.custom-md .m3-file-tree__children {
	position: relative;
	margin: 0;
	padding: 0;
	list-style: none;
}

.custom-md .m3-file-tree__root {
	min-width: min(100%, 24rem);
	padding: var(--m3e-space-1) var(--m3e-space-2);
}

.custom-md .m3-file-tree .m3-file-tree__children {
	margin: 0;
	margin-inline-start: var(--m3e-space-4);
	padding: 0;
	padding-inline-start: var(--m3e-space-2);
	border-inline-start: 1px dashed var(--outline-variant);
}

.custom-md .m3-file-tree__node {
	margin: 0;
	padding: 0;
	list-style: none;
}

.custom-md .m3-file-tree__row {
	display: grid;
	grid-template-columns: var(--m3e-space-4) var(--m3e-space-4) var(--m3e-space-4) minmax(0, 1fr) minmax(0, 40%);
	align-items: center;
	gap: var(--m3e-space-1);
	min-height: calc(var(--m3e-space-6) + var(--m3e-space-1));
	padding: var(--m3e-space-1);
	border-radius: var(--shape-corner-s);
	transition: background-color var(--m3e-duration-short) var(--m3e-easing-standard);
}

.custom-md .m3-file-tree__disclosure-icon {
	width: var(--m3e-space-4);
	height: var(--m3e-space-4);
}

.custom-md .m3-file-tree__branch {
	min-width: 0;
}

.custom-md .m3-file-tree__row:hover {
	background: color-mix(in oklab, var(--on-surface) 8%, transparent);
}

.custom-md .m3-file-tree__diff {
	color: var(--on-surface-variant);
	font: var(--m3e-type-label-medium);
	text-align: center;
}

.custom-md .m3-file-tree__icon {
	display: block;
	width: var(--m3e-space-4);
	height: var(--m3e-space-4);
	color: var(--on-surface-variant);
}

.custom-md .m3-file-tree__icon--primary {
	color: var(--primary);
}

.custom-md .m3-file-tree__icon--secondary {
	color: var(--secondary);
}

.custom-md .m3-file-tree__icon--tertiary {
	color: var(--tertiary);
}

.custom-md .m3-file-tree__icon--error {
	color: var(--error);
}

.custom-md .m3-file-tree__header-icon {
	flex: 0 0 var(--m3e-space-5);
}

.custom-md .m3-file-tree__name {
	min-width: 0;
	overflow-wrap: anywhere;
}

.custom-md .m3-file-tree__comment {
	justify-self: end;
	min-width: 0;
	max-width: 100%;
	margin-inline-end: var(--m3e-space-1);
	color: var(--on-surface-variant);
	font: var(--m3e-type-body-small);
	font-style: italic;
	overflow-wrap: anywhere;
	text-align: right;
}

.custom-md .m3-file-tree__node--emphasized > .m3-file-tree__row .m3-file-tree__name,
.custom-md .m3-file-tree__node--directory > .m3-file-tree__row .m3-file-tree__name {
	font-weight: 600;
}

.custom-md .m3-file-tree__node--added > .m3-file-tree__row {
	background: color-mix(in oklab, var(--primary) 12%, transparent);
}

.custom-md .m3-file-tree__node--added > .m3-file-tree__row .m3-file-tree__diff,
.custom-md .m3-file-tree__node--added > .m3-file-tree__row .m3-file-tree__name {
	color: var(--primary);
}

.custom-md .m3-file-tree__node--deleted > .m3-file-tree__row {
	background: color-mix(in oklab, var(--error) 10%, transparent);
}

.custom-md .m3-file-tree__node--deleted > .m3-file-tree__row .m3-file-tree__diff,
.custom-md .m3-file-tree__node--deleted > .m3-file-tree__row .m3-file-tree__name {
	color: var(--error);
}

.custom-md .m3-file-tree__node--deleted > .m3-file-tree__row .m3-file-tree__name {
	text-decoration: line-through;
}

@media (max-width: 35.99rem) {
	.custom-md .m3-file-tree__row {
		grid-template-columns: var(--m3e-space-4) var(--m3e-space-4) var(--m3e-space-4) minmax(0, 1fr);
	}

	.custom-md .m3-file-tree__comment {
		display: none;
	}
}

/* --- M3E 代码树 (Code Tree) --- */
.custom-md .m3-code-tree {
	margin: var(--m3e-space-6) 0;
	border: 1px solid var(--outline-variant);
	border-radius: var(--shape-corner-l);
	background: var(--codeblock-bg);
	color: var(--on-surface);
	overflow: hidden;
}

/* 顶部标题栏 */
.custom-md .m3-code-tree__header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--m3e-space-2);
	min-height: calc(var(--m3e-space-8) + var(--m3e-space-1));
	padding: var(--m3e-space-1) var(--m3e-space-3);
	border-bottom: 1px solid var(--outline-variant);
	background: var(--codeblock-topbar-bg);
	color: var(--on-surface);
	font: var(--m3e-type-label-large);
}

.custom-md .m3-code-tree__header-start {
	display: flex;
	align-items: center;
	gap: var(--m3e-space-2);
	min-width: 0;
	flex: 1;
}

.custom-md .m3-code-tree__header-actions {
	display: flex;
	align-items: center;
	gap: var(--m3e-space-1);
	flex-shrink: 0;
}

.custom-md .m3-code-tree__header-icon {
	display: flex;
	align-items: center;
	justify-content: center;
	width: var(--m3e-space-5);
	height: var(--m3e-space-5);
	color: var(--primary);
	flex-shrink: 0;
}

.custom-md .m3-code-tree__header-icon svg {
	width: var(--m3e-space-5);
	height: var(--m3e-space-5);
}

.custom-md .m3-code-tree__action-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: var(--m3e-space-7);
	height: var(--m3e-space-7);
	padding: 0;
	border: 1px solid transparent;
	border-radius: var(--shape-corner-s);
	background: transparent;
	color: var(--on-surface-variant);
	cursor: pointer;
	transition: background-color var(--m3e-duration-short) var(--m3e-easing-standard),
		color var(--m3e-duration-short) var(--m3e-easing-standard),
		border-color var(--m3e-duration-short) var(--m3e-easing-standard);
}

.custom-md .m3-code-tree__action-btn:hover {
	background: color-mix(in oklab, var(--on-surface) 8%, transparent);
	color: var(--on-surface);
	border-color: var(--outline-variant);
}

.custom-md .m3-code-tree__action-btn:active {
	background: color-mix(in oklab, var(--on-surface) 12%, transparent);
}

.custom-md .m3-code-tree__action-btn:focus-visible {
	outline: 2px solid var(--primary);
	outline-offset: 1px;
}

.custom-md .m3-code-tree__action-btn svg,
.custom-md .m3-code-tree__action-icon {
	width: var(--m3e-space-4);
	height: var(--m3e-space-4);
}

.custom-md .m3-code-tree__title {
	min-width: 0;
	overflow-wrap: anywhere;
}

/* 分栏主体 */
.custom-md .m3-code-tree__body {
	display: flex;
	height: var(--code-tree-height, 26.25rem);
	min-height: 18rem;
}

/* 左侧文件树导航栏 */
.custom-md .m3-code-tree__nav {
	width: 14rem;
	min-width: 11rem;
	max-width: 18rem;
	flex-shrink: 0;
	border-inline-end: 1px solid var(--outline-variant);
	background: var(--surface-container-low, color-mix(in oklab, var(--on-surface) 3%, var(--codeblock-bg)));
	overflow: auto;
	overscroll-behavior: contain;
	scrollbar-width: none;
	padding: var(--m3e-space-2) var(--m3e-space-1);
}

.custom-md .m3-code-tree__nav::-webkit-scrollbar,
.custom-md .m3-code-tree__content::-webkit-scrollbar {
	display: none;
	width: 0;
	height: 0;
}

.custom-md .m3-code-tree__tree-root,
.custom-md .m3-code-tree__sub-tree {
	list-style: none;
	margin: 0;
	padding: 0;
}

.custom-md .m3-code-tree__sub-tree {
	margin-inline-start: var(--m3e-space-3);
	padding-inline-start: var(--m3e-space-1);
	border-inline-start: 1px dashed var(--outline-variant);
}

.custom-md .m3-code-tree__tree-node {
	list-style: none;
	margin: 0;
	padding: 0;
}

.custom-md .m3-code-tree__disclosure {
	margin: 0;
}

.custom-md .m3-code-tree__dir-label {
	display: flex;
	align-items: center;
	gap: var(--m3e-space-1);
	width: 100%;
	padding: var(--m3e-space-1) var(--m3e-space-2);
	border-radius: var(--shape-corner-s);
	font: var(--m3e-type-body-small);
	font-weight: 600;
	color: var(--on-surface-variant);
	cursor: pointer;
	user-select: none;
	transition: background-color var(--m3e-duration-short) var(--m3e-easing-standard),
		color var(--m3e-duration-short) var(--m3e-easing-standard);
}

.custom-md .m3-code-tree__dir-label:hover {
	background: color-mix(in oklab, var(--on-surface) 6%, transparent);
	color: var(--on-surface);
}

.custom-md .m3-code-tree__dir-label:active {
	background: color-mix(in oklab, var(--on-surface) 10%, transparent);
}

.custom-md .m3-code-tree__dir-label:focus-visible {
	outline: 2px solid var(--primary);
	outline-offset: 1px;
}

.custom-md .m3-code-tree__dir-icon {
	display: flex;
	align-items: center;
	justify-content: center;
	width: var(--m3e-space-4);
	height: var(--m3e-space-4);
	color: var(--primary);
	flex-shrink: 0;
}

.custom-md .m3-code-tree__dir-icon svg,
.custom-md .m3-code-tree__file-icon svg {
	width: var(--m3e-space-4);
	height: var(--m3e-space-4);
}

.custom-md .m3-code-tree__dir-name {
	min-width: 0;
	overflow-wrap: anywhere;
}

.custom-md .m3-code-tree__file-btn {
	display: flex;
	align-items: center;
	gap: var(--m3e-space-1);
	width: 100%;
	padding: var(--m3e-space-1) var(--m3e-space-2);
	border: none;
	background: transparent;
	border-radius: var(--shape-corner-s);
	font: var(--m3e-type-body-small);
	font-family: var(--font-mono, var(--m3e-font-mono-fallback));
	color: var(--on-surface-variant);
	text-align: left;
	cursor: pointer;
	transition: background-color var(--m3e-duration-short) var(--m3e-easing-standard),
		color var(--m3e-duration-short) var(--m3e-easing-standard);
}

.custom-md .m3-code-tree__file-btn:hover {
	background: color-mix(in oklab, var(--on-surface) 6%, transparent);
	color: var(--on-surface);
}

.custom-md .m3-code-tree__file-btn:active {
	background: color-mix(in oklab, var(--on-surface) 10%, transparent);
}

.custom-md .m3-code-tree__file-btn:focus-visible {
	outline: 2px solid var(--primary);
	outline-offset: 1px;
}

/* 激活文件项：聚焦文件名本体的高亮，保持树结构自然通透 */
.custom-md .m3-code-tree__file-btn--active,
.custom-md .m3-code-tree__tree-node--file[aria-selected="true"] > .m3-code-tree__file-btn {
	background: color-mix(in oklab, var(--on-surface) 5%, transparent);
	color: var(--on-surface);
}

.custom-md .m3-code-tree__file-btn--active .m3-code-tree__file-name,
.custom-md .m3-code-tree__tree-node--file[aria-selected="true"] > .m3-code-tree__file-btn .m3-code-tree__file-name {
	color: var(--primary);
	font-weight: 700;
	text-decoration: underline;
	text-decoration-color: var(--primary);
	text-underline-offset: 3px;
	text-decoration-thickness: 1.5px;
}

.custom-md .m3-code-tree__file-btn--active:hover,
.custom-md .m3-code-tree__tree-node--file[aria-selected="true"] > .m3-code-tree__file-btn:hover {
	background: color-mix(in oklab, var(--on-surface) 8%, transparent);
	color: var(--on-surface);
}

.custom-md .m3-code-tree__file-btn--active:active,
.custom-md .m3-code-tree__tree-node--file[aria-selected="true"] > .m3-code-tree__file-btn:active {
	background: color-mix(in oklab, var(--on-surface) 10%, transparent);
	color: var(--on-surface);
}

.custom-md .m3-code-tree__file-btn--active:hover .m3-code-tree__file-name,
.custom-md .m3-code-tree__tree-node--file[aria-selected="true"] > .m3-code-tree__file-btn:hover .m3-code-tree__file-name,
.custom-md .m3-code-tree__file-btn--active:active .m3-code-tree__file-name,
.custom-md .m3-code-tree__tree-node--file[aria-selected="true"] > .m3-code-tree__file-btn:active .m3-code-tree__file-name {
	color: var(--primary);
	font-weight: 700;
	text-decoration: underline;
	text-decoration-color: var(--primary);
	text-underline-offset: 3px;
	text-decoration-thickness: 1.5px;
}

.custom-md .m3-code-tree__file-icon {
	display: flex;
	align-items: center;
	justify-content: center;
	width: var(--m3e-space-4);
	height: var(--m3e-space-4);
	flex-shrink: 0;
	opacity: 0.8;
	transition: opacity var(--m3e-duration-short) var(--m3e-easing-standard);
}

.custom-md .m3-code-tree__file-btn:hover .m3-code-tree__file-icon,
.custom-md .m3-code-tree__file-btn--active .m3-code-tree__file-icon {
	opacity: 1;
}

.custom-md .m3-code-tree__file-name {
	min-width: 0;
	overflow-wrap: anywhere;
	transition: color var(--m3e-duration-short) var(--m3e-easing-standard);
}

/* 右侧代码面板查看器 */
.custom-md .m3-code-tree__content {
	flex: 1;
	min-width: 0;
	height: 100%;
	overflow: auto;
	overscroll-behavior: contain;
	scrollbar-width: none;
	background: var(--codeblock-bg);
}

.custom-md .m3-code-tree__panel {
	min-height: 100%;
}

/* !important boundary: Tailwind Typography / Expressive Code owns prose code geometry; code-tree panels own panel visibility. */
.custom-md .m3-code-tree__panel.hidden {
	display: none !important;
}

/* !important boundary: Tailwind Typography / Expressive Code owns default code margins and borders; code-tree panels own embedded block geometry. */
.custom-md .m3-code-tree__panel .expressive-code {
	margin: 0 !important;
	border: none !important;
	border-radius: 0 !important;
	height: auto;
	min-height: 100%;
}

/* !important boundary: Expressive Code frames own default borders; code-tree panel embedded frame removes redundant borders. */
.custom-md .m3-code-tree__panel .expressive-code .frame {
	border: none !important;
	border-radius: 0 !important;
	height: auto;
	min-height: 100%;
}

/* Code Tree owns scrolling; embedded code blocks must not create a second scroll viewport. */
.custom-md .m3-code-tree__panel .expressive-code .frame > pre {
	height: auto;
	min-height: 0;
	margin: 0 !important;
	border: none !important;
	border-radius: 0 !important;
	max-height: none !important;
	overflow: visible !important;
}

/* 响应式断点 */
@media (max-width: 47.99rem) {
	.custom-md .m3-code-tree__body {
		flex-direction: column;
		height: auto;
	}

	.custom-md .m3-code-tree__nav {
		width: 100%;
		max-width: 100%;
		max-height: 10rem;
		border-inline-end: none;
		border-bottom: 1px solid var(--outline-variant);
	}

	.custom-md .m3-code-tree__content {
		height: var(--code-tree-height, 22rem);
		max-height: 28rem;
	}
}

/* --- M3E 代码树模态弹窗 (Code Tree Fullscreen Modal) --- */
.m3-code-tree-dialog {
	position: fixed;
	inset: 0;
	box-sizing: border-box;
	margin: auto;
	width: min(94vw, 86rem);
	height: min(90vh, 58rem);
	max-width: 100vw;
	max-height: 100vh;
	padding: 0;
	border: 1px solid var(--outline-variant);
	border-radius: var(--shape-corner-xl);
	background: var(--surface-container-high, var(--codeblock-bg));
	color: var(--on-surface);
	box-shadow: var(--m3e-elevation-4, 0 16px 32px rgba(0, 0, 0, 0.28));
	overflow: hidden;
	z-index: 1000;
	animation: m3-code-tree-dialog-in var(--m3e-duration-medium) var(--m3e-easing-emphasized-decelerate);
}

.m3-code-tree-dialog::backdrop {
	background: color-mix(in srgb, var(--mc-scrim, #000) 48%, transparent);
	backdrop-filter: blur(8px);
	-webkit-backdrop-filter: blur(8px);
	animation: m3-code-tree-backdrop-fade-in var(--m3e-duration-medium) var(--m3e-easing-standard);
}

.m3-code-tree-dialog.closing {
	animation: m3-code-tree-dialog-out var(--m3e-duration-short) var(--m3e-easing-emphasized-accelerate) forwards;
}

.m3-code-tree-dialog.closing::backdrop {
	animation: m3-code-tree-backdrop-fade-out var(--m3e-duration-short) var(--m3e-easing-standard) forwards;
}

.m3-code-tree-dialog .m3-code-tree {
	margin: 0;
	border: none;
	border-radius: 0;
	height: 100%;
	display: flex;
	flex-direction: column;
	background: transparent;
}

.m3-code-tree-dialog .m3-code-tree__body {
	flex: 1;
	height: calc(100% - 3rem);
	min-height: 0;
}

.m3-code-tree-dialog .m3-code-tree__nav {
	width: 18rem;
	min-width: 14rem;
	max-width: 24rem;
	height: 100%;
}

.m3-code-tree-dialog .m3-code-tree__content {
	height: 100%;
}

.m3-code-tree-dialog .m3-code-tree__icon-expand {
	display: none;
}

.m3-code-tree-dialog .m3-code-tree__icon-collapse {
	display: inline-flex;
}

@media (max-width: 47.99rem) {
	.m3-code-tree-dialog {
		inset: 0;
		width: 100dvw;
		height: 100dvh;
		max-width: none;
		max-height: none;
		margin: 0;
		border: none;
		border-radius: 0;
	}

	.m3-code-tree-dialog .m3-code-tree__body {
		flex: 1;
		flex-direction: column;
		height: auto;
		min-height: 0;
	}

	.m3-code-tree-dialog .m3-code-tree__nav {
		flex: 0 1 auto;
		width: 100%;
		min-width: 0;
		max-width: none;
		height: auto;
		max-height: min(30dvh, 14rem);
		border-inline-end: none;
		border-bottom: 1px solid var(--outline-variant);
	}

	.m3-code-tree-dialog .m3-code-tree__content {
		flex: 1;
		height: auto;
		min-height: 0;
		max-height: none;
	}
}

@keyframes m3-code-tree-backdrop-fade-in {
	from {
		opacity: 0;
	}
	to {
		opacity: 1;
	}
}

@keyframes m3-code-tree-backdrop-fade-out {
	from {
		opacity: 1;
	}
	to {
		opacity: 0;
	}
}

@keyframes m3-code-tree-dialog-in {
	from {
		opacity: 0;
		transform: scale(0.96);
	}
	to {
		opacity: 1;
		transform: scale(1);
	}
}

@keyframes m3-code-tree-dialog-out {
	from {
		opacity: 1;
		transform: scale(1);
	}
	to {
		opacity: 0;
		transform: scale(0.96);
	}
}

@media (prefers-reduced-motion: reduce) {
	.custom-md .m3-file-tree__row,
	.custom-md .m3-code-tree__dir-label,
	.custom-md .m3-code-tree__file-btn,
	.m3-code-tree-dialog {
		transition: none;
		animation: none;
	}
}