:root {
	--bg-page: #000000;
	--bg-panel: #0c0c0f;
	--bg-raised: #141417;
	--border-hairline: #1c1c20;
	--border-strong: #2b2b30;

	--text-primary: #ececec;
	--text-secondary: #a3aab2;
	--text-muted: #71787f;

	--accent: #4c93e0;
	--gold: #e0b23c;
	--danger: #e5484d;
	--green: #5fb87a;

	--font-display: 'Rajdhani', sans-serif;
	--font-body: 'Manrope', sans-serif;
	--font-mono: 'JetBrains Mono', monospace;

	--group-color-1: #4c93e0;
	--group-color-2: #45b8ae;
	--group-color-3: #9c85d9;
	--group-color-4: #d9823f;
	--group-color-5: #5fb87a;
	--group-color-6: #c96b9e;
}

* {
	box-sizing: border-box;
}

html, body {
	margin: 0;
	padding: 0;
	background: var(--bg-page);
	color: var(--text-primary);
	font-family: var(--font-body);
	font-size: 15px;
	line-height: 1.5;
}

body {
	min-height: 100vh;
	display: flex;
	flex-direction: column;
}

button {
	font-family: inherit;
}

a {
	color: var(--accent);
	text-decoration: none;
}

a:hover {
	text-decoration: underline;
}

/* ---------- header ---------- */

.site-header {
	background: var(--bg-page);
	border-bottom: 0.5px solid var(--border-hairline);
	padding: 20px 24px;
}

.site-header__inner {
	max-width: 1200px;
	margin: 0 auto;
	display: flex;
	align-items: center;
	gap: 24px;
	flex-wrap: wrap;
}

.site-logo-link {
	display: block;
	line-height: 0;
}

.site-logo-link:hover {
	opacity: 0.85;
}

.site-logo {
	height: 28px;
	width: auto;
	display: block;
}

.site-header__meta {
	display: flex;
	flex-direction: column;
	gap: 2px;
	border-left: 0.5px solid var(--border-strong);
	padding-left: 24px;
}

.page-kicker {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 11px;
	letter-spacing: 0.12em;
	text-transform: uppercase;
	color: var(--text-muted);
}

.page-title {
	font-family: var(--font-display);
	font-weight: 700;
	font-size: 22px;
	letter-spacing: 0.01em;
	margin: 0;
	color: var(--text-primary);
}

/* ---------- layout ---------- */

.page {
	flex: 1;
	max-width: 1200px;
	width: 100%;
	margin: 0 auto;
	padding: 32px 24px 64px;
}

/* ---------- dropzone ---------- */

.dropzone {
	background: var(--bg-panel);
	border: 0.5px dashed var(--border-strong);
	padding: 64px 24px;
	text-align: center;
	cursor: pointer;
	transition: border-color 0.15s ease, background 0.15s ease;
}

.dropzone:hover,
.dropzone.is-dragover {
	border-color: var(--accent);
	background: var(--bg-raised);
}

.dropzone__icon {
	color: var(--text-muted);
	margin-bottom: 16px;
}

.dropzone.is-dragover .dropzone__icon,
.dropzone:hover .dropzone__icon {
	color: var(--accent);
}

.dropzone__icon svg {
	width: 40px;
	height: 40px;
}

.dropzone__title {
	font-family: var(--font-display);
	font-weight: 600;
	font-size: 19px;
	margin: 0 0 6px;
	color: var(--text-primary);
}

.dropzone__sub {
	margin: 0 0 20px;
	color: var(--text-secondary);
}

.link-btn {
	background: none;
	border: none;
	padding: 0;
	color: var(--accent);
	font: inherit;
	cursor: pointer;
	text-decoration: underline;
	text-underline-offset: 2px;
}

.dropzone__formats {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 12px;
	color: var(--text-muted);
	margin: 0 0 4px;
}

.dropzone__privacy {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 12px;
	color: var(--text-muted);
	margin: 0;
}

/* ---------- error banner ---------- */

.error-banner {
	background: var(--bg-panel);
	border: 0.5px solid var(--danger);
	border-left-width: 3px;
	color: var(--text-primary);
	padding: 16px 20px;
	margin-top: 20px;
	font-size: 14px;
}

.error-banner strong {
	color: var(--danger);
	font-family: var(--font-display);
	font-weight: 700;
	text-transform: uppercase;
	font-size: 12px;
	letter-spacing: 0.06em;
	display: block;
	margin-bottom: 4px;
}

/* ---------- buttons ---------- */

.button {
	font-family: var(--font-display);
	font-weight: 600;
	font-size: 13px;
	letter-spacing: 0.03em;
	text-transform: uppercase;
	background: var(--accent);
	color: #04121f;
	border: 0.5px solid var(--accent);
	padding: 10px 18px;
	cursor: pointer;
	transition: opacity 0.15s ease;
}

.button:hover {
	opacity: 0.85;
}

.button--ghost {
	background: transparent;
	color: var(--text-secondary);
	border-color: var(--border-strong);
}

.button--ghost:hover {
	color: var(--text-primary);
	border-color: var(--accent);
	opacity: 1;
}

/* ---------- results / summary bar ---------- */

.results {
	margin-top: 28px;
}

.summary-bar {
	display: flex;
	align-items: center;
	justify-content: space-between;
	flex-wrap: wrap;
	gap: 12px;
	background: var(--bg-panel);
	border: 0.5px solid var(--border-hairline);
	padding: 14px 18px;
	margin-bottom: 20px;
}

.summary-bar__file {
	display: flex;
	align-items: center;
	gap: 12px;
	min-width: 0;
}

.summary-bar__filename {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 13px;
	color: var(--text-secondary);
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.summary-bar__actions {
	display: flex;
	gap: 10px;
}

.badge {
	font-family: var(--font-mono);
	font-weight: 600;
	font-size: 11px;
	letter-spacing: 0.06em;
	text-transform: uppercase;
	color: var(--accent);
	border: 0.5px solid var(--accent);
	padding: 3px 8px;
	white-space: nowrap;
}

/* ---------- stat tiles ---------- */

.stat-tiles {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
	gap: 1px;
	background: var(--border-hairline);
	border: 0.5px solid var(--border-hairline);
	margin-bottom: 32px;
}

.stat-tile {
	background: var(--bg-panel);
	padding: 16px 18px;
	display: flex;
	flex-direction: column;
	gap: 6px;
}

.stat-tile__label {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 11px;
	letter-spacing: 0.08em;
	text-transform: uppercase;
	color: var(--text-muted);
}

.stat-tile__value {
	font-family: var(--font-display);
	font-weight: 700;
	font-size: 24px;
	color: var(--text-primary);
}

.stat-tile__value .unit {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 13px;
	color: var(--text-secondary);
	margin-left: 4px;
}

.stat-tile__sub {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 11px;
	color: var(--text-muted);
}

.stat-tile.is-danger .stat-tile__value {
	color: var(--danger);
}

.stat-tile.is-danger .stat-tile__label {
	color: var(--danger);
}

.stat-tile.is-ok .stat-tile__value {
	color: var(--green);
}

/* ---------- comparisons ---------- */

.comparisons {
	display: flex;
	flex-direction: column;
	gap: 16px;
	margin-bottom: 12px;
}

.comparisons:not(:empty) {
	margin-bottom: 16px;
}

.add-comparison-btn {
	margin-bottom: 32px;
}

.comparison-card {
	background: var(--bg-panel);
	border: 0.5px solid var(--border-hairline);
	border-left: 3px solid var(--gold);
}

.comparison-card__header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	padding: 14px 18px;
	border-bottom: 0.5px solid var(--border-hairline);
}

.comparison-card__title {
	font-family: var(--font-display);
	font-weight: 600;
	font-size: 16px;
	color: var(--text-primary);
}

.comparison-card__actions {
	display: flex;
	align-items: center;
	gap: 8px;
}

.comparison-card__body {
	padding: 16px 18px;
}

.comparison-card__picker {
	margin-bottom: 12px;
}

.comparison-card__select {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 12px;
	background: var(--bg-raised);
	color: var(--text-primary);
	border: 0.5px solid var(--border-strong);
	padding: 8px 10px;
	width: 100%;
	max-width: 420px;
}

.comparison-card__chips {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
	margin-bottom: 12px;
}

.comparison-chip {
	display: flex;
	align-items: center;
	gap: 6px;
	background: var(--bg-raised);
	border: 0.5px solid var(--border-strong);
	padding: 5px 6px 5px 10px;
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 12px;
	color: var(--text-secondary);
}

.comparison-chip__swatch {
	width: 8px;
	height: 8px;
	flex-shrink: 0;
}

.comparison-chip__remove {
	background: none;
	border: none;
	color: var(--text-muted);
	cursor: pointer;
	font-size: 14px;
	line-height: 1;
	padding: 2px 4px;
}

.comparison-chip__remove:hover {
	color: var(--danger);
}

.comparison-card__placeholder {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 12px;
	color: var(--text-muted);
	padding: 24px 0;
	text-align: center;
}

.comparison-card__canvas-wrap {
	position: relative;
	height: 320px;
}

/* ---------- groups ---------- */

.group {
	background: var(--bg-panel);
	border: 0.5px solid var(--border-hairline);
	margin-bottom: 16px;
	border-left: 3px solid var(--group-color, var(--accent));
}

.group > summary {
	list-style: none;
	cursor: pointer;
	padding: 14px 18px;
	display: flex;
	align-items: center;
	justify-content: space-between;
	font-family: var(--font-display);
	font-weight: 600;
	font-size: 16px;
	color: var(--text-primary);
	border-bottom: 0.5px solid transparent;
}

.group[open] > summary {
	border-bottom-color: var(--border-hairline);
}

.group > summary::-webkit-details-marker {
	display: none;
}

.group__meta {
	display: flex;
	align-items: center;
	gap: 12px;
}

.group__count {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 12px;
	color: var(--text-muted);
	text-transform: none;
	letter-spacing: 0;
}

.group__chevron {
	color: var(--text-muted);
	transition: transform 0.15s ease;
}

.icon-btn {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 26px;
	height: 26px;
	background: transparent;
	border: 0.5px solid var(--border-strong);
	color: var(--text-muted);
	cursor: pointer;
	padding: 0;
	flex-shrink: 0;
}

.icon-btn svg {
	width: 14px;
	height: 14px;
}

.icon-btn:hover {
	color: var(--accent);
	border-color: var(--accent);
}

.icon-btn.is-busy {
	color: var(--accent);
	opacity: 0.6;
	pointer-events: none;
}

.group.is-exporting .group__exportBtn,
.group.is-exporting .group__chevron {
	display: none;
}

.comparison-card.is-exporting .comparison-card__actions,
.comparison-card.is-exporting .comparison-card__picker,
.comparison-card.is-exporting .comparison-chip__remove {
	display: none;
}

.group[open] > summary .group__chevron {
	transform: rotate(90deg);
}

.group__grid {
	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
	gap: 1px;
	background: var(--border-hairline);
}

.chart-card {
	background: var(--bg-panel);
	padding: 14px 16px 10px;
}

.chart-card__title {
	font-family: var(--font-body);
	font-weight: 600;
	font-size: 13px;
	color: var(--text-primary);
	margin-bottom: 2px;
}

.chart-card__stats {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 11px;
	color: var(--text-muted);
	margin-bottom: 8px;
}

.chart-card__canvas-wrap {
	position: relative;
	height: 190px;
}

.export-caption {
	text-align: center;
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 11px;
	letter-spacing: 0.04em;
	color: var(--text-muted);
	margin: 24px 0 0;
}

/* ---------- footer ---------- */

.site-footer {
	border-top: 0.5px solid var(--border-hairline);
	padding: 20px 24px;
	text-align: center;
}

.site-footer p {
	font-family: var(--font-mono);
	font-weight: 500;
	font-size: 12px;
	color: var(--text-muted);
	margin: 0;
}

/* ---------- responsive ---------- */

@media (max-width: 640px) {
	.site-header__inner {
		gap: 14px;
	}

	.site-header__meta {
		padding-left: 14px;
	}

	.page-title {
		font-size: 18px;
	}

	.dropzone {
		padding: 40px 16px;
	}

	.group__grid {
		grid-template-columns: 1fr;
	}
}