:root {
	--bg: #f4f4f2;
	--surface: #ffffff;
	--text: #1d1d1b;
	--muted: #6b6b66;
	--border: #dddcd6;
	--accent: #c2410c;
	--accent-text: #ffffff;
	--danger: #b3402f;
	--ok-bg: #e3f1e8;
	--error-bg: #f8e1dc;
	--highlight: #fdf0e8;
	--radius: 10px;
	/* Chart series, in fixed order. Validated as a set for colorblind separation. */
	--series-1: #2a78d6;
	--series-2: #eb6834;
	--series-3: #1baf7a;
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg: #161716;
		--surface: #212321;
		--text: #ecece8;
		--muted: #9c9d97;
		--border: #353733;
		--accent: #f08a4b;
		--accent-text: #1f1006;
		--danger: #e0705e;
		--ok-bg: #1f3428;
		--error-bg: #3d221d;
		--highlight: #33251c;
		--series-1: #3987e5;
		--series-2: #d95926;
		--series-3: #199e70;
	}
}

* {
	box-sizing: border-box;
}

[hidden] {
	display: none !important;
}

body {
	margin: 0;
	background: var(--bg);
	color: var(--text);
	font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
	font-size: 16px;
	line-height: 1.4;
}

/* --- navbar --- */

.navbar {
	position: sticky;
	top: 0;
	z-index: 10;
	/* Links in the middle column stay centered; the import button sits in the right column. */
	display: grid;
	grid-template-columns: 1fr auto 1fr;
	align-items: center;
	padding: 8px 16px;
	background: var(--surface);
	border-bottom: 1px solid var(--border);
}

.nav-links {
	grid-column: 2;
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: center;
	gap: 4px;
}

.nav-tools {
	grid-column: 3;
	justify-self: end;
	display: flex;
	gap: 6px;
}

/* Importing is a desktop job. */
@media (max-width: 1023px) {
	.navbar {
		grid-template-columns: 1fr;
	}

	.nav-links {
		grid-column: 1;
	}

	.nav-tools {
		display: none;
	}
}

.nav-divider {
	color: var(--border);
	padding: 0 4px;
	user-select: none;
}

.navbar a {
	padding: 8px 10px;
	border-radius: var(--radius);
	color: var(--muted);
	text-decoration: none;
	font-weight: 500;
}

.navbar a:hover {
	color: var(--text);
}

.navbar a.active {
	background: var(--accent);
	color: var(--accent-text);
}

/* --- layout --- */

main {
	max-width: 640px;
	margin: 0 auto;
	padding: 16px;
}

.card {
	background: var(--surface);
	border: 1px solid var(--border);
	border-radius: var(--radius);
	padding: 16px;
	margin-bottom: 16px;
}

h1, h2 {
	margin: 0 0 12px;
}

h1 {
	font-size: 1.4rem;
}

h2 {
	font-size: 1.1rem;
	text-transform: capitalize;
}

.hint {
	color: var(--muted);
	font-size: 0.9rem;
	margin: 12px 0 0;
}

.hint-top {
	margin: 0 0 12px;
}

/* --- pickers --- */

.field {
	display: flex;
	flex-direction: column;
	gap: 4px;
	margin-bottom: 12px;
}

.field-spaced {
	margin: 16px 0 0;
}

.field-label {
	font-size: 0.9rem;
	color: var(--muted);
}

.segmented {
	display: flex;
	flex-wrap: wrap;
	gap: 6px;
}

.segmented button {
	flex: 1 1 0;
	min-width: 0;
	text-transform: capitalize;
	white-space: nowrap;
}

.segmented button[aria-pressed="true"] {
	background: var(--accent);
	border-color: var(--accent);
	color: var(--accent-text);
	font-weight: 600;
}

.segmented button:disabled[aria-pressed="true"] {
	opacity: 0.7;
}

/* --- forms --- */

form {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 12px;
}

label {
	display: flex;
	flex-direction: column;
	gap: 4px;
	font-size: 0.9rem;
	color: var(--muted);
}

input, select {
	font: inherit;
	color: var(--text);
	background: var(--bg);
	border: 1px solid var(--border);
	border-radius: 8px;
	padding: 10px;
	min-height: 44px;
}

input:focus, select:focus {
	outline: 2px solid var(--accent);
	outline-offset: 1px;
}

select:disabled {
	opacity: 0.6;
}

.form-wide {
	grid-column: 1 / -1;
	margin: 0;
}

.form-actions {
	grid-column: 1 / -1;
	display: flex;
	gap: 8px;
}

button {
	font: inherit;
	cursor: pointer;
	border: 1px solid var(--border);
	background: var(--surface);
	color: var(--text);
	border-radius: 8px;
	padding: 10px 16px;
	min-height: 44px;
}

button:disabled {
	cursor: default;
	opacity: 0.4;
}

button.primary {
	flex: 1;
	background: var(--accent);
	border-color: var(--accent);
	color: var(--accent-text);
	font-weight: 600;
}

button.small {
	padding: 4px 10px;
	min-height: 32px;
	font-size: 0.85rem;
}

button.danger {
	color: var(--danger);
}

/* --- status bar --- */

.status {
	display: none;
	padding: 10px 14px;
	border-radius: var(--radius);
	margin-bottom: 16px;
}

.status-ok {
	display: block;
	background: var(--ok-bg);
}

.status-error {
	display: block;
	background: var(--error-bg);
	color: var(--danger);
}

/* --- sets table --- */

table {
	width: 100%;
	border-collapse: collapse;
}

th, td {
	text-align: left;
	padding: 8px 4px;
	border-bottom: 1px solid var(--border);
}

th {
	color: var(--muted);
	font-weight: 500;
	font-size: 0.85rem;
}

tr.editing {
	background: var(--highlight);
}

.row-actions {
	text-align: right;
	white-space: nowrap;
}

.row-actions button + button {
	margin-left: 4px;
}

/* --- volume --- */

.volume-header {
	display: flex;
	align-items: flex-end;
	justify-content: space-between;
	gap: 12px;
	margin-top: 12px;
}

.muscle-row {
	display: grid;
	grid-template-columns: 1fr 44px 40px 44px;
	align-items: center;
	gap: 8px;
	padding: 6px 0;
	border-bottom: 1px solid var(--border);
}

.muscle-row:last-child {
	border-bottom: none;
}

.muscle-name {
	text-transform: capitalize;
}

.muscle-count {
	text-align: center;
	font-weight: 600;
	font-variant-numeric: tabular-nums;
	color: var(--muted);
}

.muscle-row.has-sets .muscle-count {
	color: var(--accent);
}

.stepper {
	padding: 0;
	font-size: 1.3rem;
	font-weight: 600;
}

/* --- charts --- */

.chart-subtitle {
	color: var(--muted);
	font-size: 0.9rem;
	margin: -6px 0 12px;
}

.chart-subtitle:empty {
	display: none;
}

.chart-frame {
	position: relative;
	height: 260px;
}

.chart-data {
	margin-top: 12px;
	font-size: 0.9rem;
}

.chart-data summary {
	cursor: pointer;
	color: var(--muted);
}

.table-scroll {
	max-height: 320px;
	overflow: auto;
	margin-top: 8px;
}

.table-scroll td, .table-scroll th {
	font-variant-numeric: tabular-nums;
}

.stats {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 12px;
}

.stat {
	display: flex;
	flex-direction: column;
	gap: 2px;
}

.stat-label {
	color: var(--muted);
	font-size: 0.85rem;
}

.stat strong {
	font-size: 1.3rem;
	font-variant-numeric: tabular-nums;
}

@media (max-width: 420px) {
	form {
		grid-template-columns: 1fr;
	}

	.navbar {
		padding: 6px 12px;
	}

	.nav-links {
		gap: 2px;
	}

	.navbar a {
		padding: 6px 8px;
		font-size: 0.9rem;
	}
}