:root {
	--font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body.theme-dark {
	--surface: #111827;
	--surface-alt: #0f172a;
	--surface-end: #020617;
	--surface-highlight: #1f2937;
	--bar-bg: rgba(15, 23, 42, 0.85);
	--tab-bg: rgba(15, 23, 42, 0.75);
	--tab-hover-border: rgba(148, 163, 184, 0.2);
	--tab-close-hover: rgba(148, 163, 184, 0.15);
	--panel-bg: rgba(15, 23, 42, 0.65);
	--preview-panel-bg: rgba(15, 23, 42, 0.5);
	--pre-bg: rgba(15, 23, 42, 0.8);
	--code-bg: rgba(15, 23, 42, 0.65);
	--accent: #38bdf8;
	--accent-soft: rgba(56, 189, 248, 0.15);
	--accent-border: rgba(56, 189, 248, 0.5);
	--accent-text: #0f172a;
	--text: #f1f5f9;
	--text-muted: #94a3b8;
	--border: rgba(148, 163, 184, 0.2);
	--border-strong: rgba(148, 163, 184, 0.6);
	--link-color: #38bdf8;
	--blockquote-text: #94a3b8;
	--shadow-active: rgba(56, 189, 248, 0.2);
	--toggle-border: rgba(148, 163, 184, 0.35);
	--toggle-border-hover: rgba(148, 163, 184, 0.7);
}

body.theme-light {
	--surface: #f8fafc;
	--surface-alt: #e2e8f0;
	--surface-end: #cbd5f5;
	--surface-highlight: #e2e8f0;
	--bar-bg: rgba(255, 255, 255, 0.85);
	--tab-bg: rgba(226, 232, 240, 0.75);
	--tab-hover-border: rgba(148, 163, 184, 0.5);
	--tab-close-hover: rgba(148, 163, 184, 0.35);
	--panel-bg: rgba(255, 255, 255, 0.8);
	--preview-panel-bg: rgba(255, 255, 255, 0.7);
	--pre-bg: rgba(241, 245, 249, 0.9);
	--code-bg: rgba(226, 232, 240, 0.9);
	--accent: #0284c7;
	--accent-soft: rgba(2, 132, 199, 0.15);
	--accent-border: rgba(2, 132, 199, 0.48);
	--accent-text: #f8fafc;
	--text: #0f172a;
	--text-muted: #475569;
	--border: rgba(148, 163, 184, 0.35);
	--border-strong: rgba(71, 85, 105, 0.6);
	--link-color: #0369a1;
	--blockquote-text: #334155;
	--shadow-active: rgba(2, 132, 199, 0.25);
	--toggle-border: rgba(148, 163, 184, 0.5);
	--toggle-border-hover: rgba(71, 85, 105, 0.7);
}

*,
*::before,
*::after {
	box-sizing: border-box;
}

html,
body {
	height: 100%;
}

body {
	margin: 0;
	font-family: var(--font-body);
	background: linear-gradient(160deg, var(--surface) 0%, var(--surface-end) 100%);
	color: var(--text);
	display: flex;
}

.app-shell {
	flex: 1;
	display: flex;
	flex-direction: column;
	min-height: 100vh;
}

.tab-bar {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	padding: 0.75rem 1.25rem;
	background: var(--bar-bg);
	backdrop-filter: blur(12px);
	border-bottom: 1px solid var(--border);
}

.tab-bar__title {
	font-weight: 600;
	letter-spacing: 0.05em;
	text-transform: uppercase;
	font-size: 0.85rem;
	color: var(--text-muted);
}

.tab-bar__tabs {
	display: flex;
	flex: 1;
	gap: 0.5rem;
	overflow-x: auto;
	padding-bottom: 0.25rem;
	scrollbar-width: thin;
}

.tab-bar__tabs::-webkit-scrollbar {
	height: 6px;
}

.tab-bar__tabs::-webkit-scrollbar-thumb {
	background: rgba(148, 163, 184, 0.3);
	border-radius: 999px;
}

.tab {
	position: relative;
	display: inline-flex;
	align-items: center;
	gap: 0.5rem;
	padding: 0.45rem 0.75rem;
	border-radius: 999px;
	border: 1px solid transparent;
	background: var(--tab-bg);
	color: var(--text-muted);
	font-size: 0.85rem;
	cursor: pointer;
	transition: all 0.15s ease;
	white-space: nowrap;
}

.tab:hover {
	color: var(--text);
	border-color: var(--tab-hover-border);
}

.tab--active {
	background: var(--accent-soft);
	color: var(--text);
	border-color: var(--accent-border);
	box-shadow: 0 0 0 2px var(--shadow-active);
}

.tab__title {
	max-width: 12rem;
	overflow: hidden;
	text-overflow: ellipsis;
}

.tab__close {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 1.2rem;
	height: 1.2rem;
	border-radius: 999px;
	border: none;
	background: transparent;
	color: inherit;
	font-size: 0.85rem;
	padding: 0;
	cursor: pointer;
}

.tab__close:hover {
	background: var(--tab-close-hover);
}

.tab-bar__add {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.45rem 0.9rem;
	border-radius: 999px;
	border: none;
	background: var(--accent);
	color: var(--accent-text);
	font-weight: 600;
	cursor: pointer;
	transition: filter 0.15s ease;
}

.tab-bar__add:hover {
	filter: brightness(1.05);
}

.tab-bar__toggle {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.45rem 0.9rem;
	border-radius: 999px;
	border: 1px solid var(--toggle-border);
	background: transparent;
	color: var(--text-muted);
	cursor: pointer;
	transition: all 0.15s ease;
}

.tab-bar__theme {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.45rem 0.9rem;
	border-radius: 999px;
	border: 1px solid var(--toggle-border);
	background: transparent;
	color: var(--text-muted);
	cursor: pointer;
	transition: all 0.15s ease;
}

.tab-bar__theme:hover {
	color: var(--text);
	border-color: var(--toggle-border-hover);
}

.tab-bar__theme[aria-pressed="true"] {
	color: var(--accent);
	border-color: var(--accent-border);
	background: var(--accent-soft);
}

.tab-bar__toggle:hover {
	color: var(--text);
	border-color: var(--toggle-border-hover);
}

.tab-bar__toggle[aria-pressed="false"] {
	color: var(--accent);
	border-color: var(--accent-border);
	background: var(--accent-soft);
}

.workspace {
	flex: 1;
	display: flex;
	position: relative;
	min-height: 0;
}

.workspace__panel {
	flex: 1;
	display: flex;
	flex-direction: column;
	background: var(--panel-bg);
}

.workspace__panel--editor {
	border-right: 1px solid var(--border);
}

.workspace__panel--preview {
	max-width: 36rem;
	border-left: 1px solid var(--border);
	background: var(--preview-panel-bg);
}

.editor {
	flex: 1;
	width: 100%;
	padding: 1.5rem;
	border: none;
	background: transparent;
	color: var(--text);
	font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, 'SFMono-Regular', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
	font-size: 1rem;
	line-height: 1.6;
	resize: none;
}

.editor:focus {
	outline: none;
}

.preview__header {
	display: flex;
	align-items: center;
	justify-content: flex-start;
	padding: 1rem 1.5rem;
	border-bottom: 1px solid var(--border);
}

.preview__header h2 {
	margin: 0;
	font-size: 0.95rem;
	color: var(--text-muted);
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.08em;
}

.preview {
	flex: 1;
	overflow-y: auto;
	padding: 1.5rem;
	color: var(--text);
	line-height: 1.7;
}

.preview h1,
.preview h2,
.preview h3,
.preview h4,
.preview h5,
.preview h6 {
	margin-top: 1.5rem;
	margin-bottom: 0.75rem;
	color: var(--text);
}

.preview p {
	margin: 0 0 1rem;
}

.preview pre {
	background: var(--pre-bg);
	padding: 1rem;
	border-radius: 0.75rem;
	overflow-x: auto;
	border: 1px solid var(--border);
}

.preview code {
	font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
	background: var(--code-bg);
	padding: 0.2rem 0.4rem;
	border-radius: 0.4rem;
}

.preview ul,
.preview ol {
	padding-left: 1.2rem;
	margin-top: 0;
	margin-bottom: 1rem;
}

.preview blockquote {
	border-left: 2px solid var(--accent-border);
	padding-left: 1rem;
	margin: 1rem 0;
	color: var(--blockquote-text);
}

.preview table {
	width: 100%;
	border-collapse: collapse;
	margin-bottom: 1.5rem;
}

.preview th,
.preview td {
	border: 1px solid var(--border);
	padding: 0.6rem 0.8rem;
	text-align: left;
}

.preview a {
	color: var(--link-color);
	text-decoration: none;
}

.preview a:hover {
	text-decoration: underline;
}

.preview-hidden .workspace__panel--preview {
	display: none;
}

.preview-hidden .workspace__panel--editor {
	border-right: none;
}

@media (max-width: 1024px) {
	.workspace__panel--preview {
		max-width: none;
	}
}

@media (max-width: 768px) {
	.tab-bar {
		gap: 0.5rem;
		padding: 0.6rem 0.8rem;
	}

	.tab-bar__title {
		display: none;
	}

	.preview__header {
		padding: 0.75rem 1rem;
	}

	.preview {
		padding: 1rem;
	}
}