:root {
	color-scheme: dark;
	font-family: 'Inter', system-ui, sans-serif;
	--color-bg: #0a0a0b;
	--color-surface: #141416;
	--color-surface-elevated: #1c1c1f;
	--color-border: #2a2a2e;
	--color-text: #f5f5f7;
	--color-text-muted: #8e8e93;
	--color-accent: #ff3b30;
	--color-accent-secondary: #ff9500;
	--color-success: #30d158;
	--radius-sm: 8px;
	--radius-md: 12px;
	--radius-lg: 16px;
}

* {
	box-sizing: border-box;
	margin: 0;
	padding: 0;
}

body {
	background: var(--color-bg);
	color: var(--color-text);
	min-height: 100vh;
}

.app {
	max-width: 900px;
	margin: 0 auto;
	padding: 2rem 1.5rem;
}

.header {
	text-align: center;
	margin-bottom: 3rem;
}

.header__title {
	font-size: 3rem;
	font-weight: 900;
	letter-spacing: -0.03em;
	background: linear-gradient(135deg, var(--color-text) 0%, var(--color-text-muted) 100%);
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
}

.header__title--accent {
	background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
	-webkit-background-clip: text;
	background-clip: text;
}

.header__subtitle {
	color: var(--color-text-muted);
	font-size: 1rem;
	margin-top: 0.25rem;
	text-transform: uppercase;
	letter-spacing: 0.2em;
}

.main {
	display: grid;
	gap: 2rem;
}

.section__title {
	font-size: 1.25rem;
	font-weight: 700;
	margin-bottom: 1.25rem;
	display: flex;
	align-items: center;
	gap: 0.5rem;
}

.section__title::before {
	content: '';
	width: 4px;
	height: 1.25rem;
	background: linear-gradient(180deg, var(--color-accent), var(--color-accent-secondary));
	border-radius: 2px;
}

.log-section,
.chart-section,
.history-section {
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-lg);
	padding: 1.5rem;
}

.form {
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.form__row {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1rem;
}

.form__group {
	display: flex;
	flex-direction: column;
	gap: 0.5rem;
}

.form__label {
	font-size: 0.875rem;
	font-weight: 500;
	color: var(--color-text-muted);
}

.form__input {
	background: var(--color-surface-elevated);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-sm);
	padding: 0.75rem 1rem;
	font-size: 1rem;
	color: var(--color-text);
	font-family: inherit;
	transition: border-color 0.2s, box-shadow 0.2s;
}

.form__input:focus {
	outline: none;
	border-color: var(--color-accent);
	box-shadow: 0 0 0 3px rgba(255, 59, 48, 0.15);
}

.form__input--textarea {
	resize: vertical;
	min-height: 80px;
}

.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 0.5rem;
	padding: 0.875rem 1.5rem;
	font-size: 1rem;
	font-weight: 600;
	border: none;
	border-radius: var(--radius-sm);
	cursor: pointer;
	transition: transform 0.2s, box-shadow 0.2s;
	font-family: inherit;
}

.btn--primary {
	background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
	color: white;
}

.btn--primary:hover {
	transform: translateY(-2px);
	box-shadow: 0 8px 24px rgba(255, 59, 48, 0.3);
}

.btn--primary:active {
	transform: translateY(0);
}

.btn svg {
	width: 18px;
	height: 18px;
}

.chart-container {
	background: var(--color-surface-elevated);
	border-radius: var(--radius-md);
	padding: 1rem;
	margin-bottom: 1.5rem;
	height: 250px;
}

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

.stat {
	text-align: center;
	padding: 1rem;
	background: var(--color-surface-elevated);
	border-radius: var(--radius-md);
}

.stat__value {
	display: block;
	font-size: 2rem;
	font-weight: 800;
	background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
	-webkit-background-clip: text;
	-webkit-text-fill-color: transparent;
	background-clip: text;
}

.stat__label {
	font-size: 0.75rem;
	color: var(--color-text-muted);
	text-transform: uppercase;
	letter-spacing: 0.05em;
}

.workout-list {
	display: flex;
	flex-direction: column;
	gap: 0.75rem;
	max-height: 400px;
	overflow-y: auto;
}

.workout-list__empty {
	text-align: center;
	color: var(--color-text-muted);
	padding: 2rem;
}

.workout-card {
	display: flex;
	align-items: center;
	gap: 1rem;
	padding: 1rem;
	background: var(--color-surface-elevated);
	border-radius: var(--radius-md);
	border-left: 3px solid var(--color-accent);
}

.workout-card__icon {
	width: 44px;
	height: 44px;
	background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
	border-radius: var(--radius-sm);
	display: flex;
	align-items: center;
	justify-content: center;
	flex-shrink: 0;
}

.workout-card__icon svg {
	width: 22px;
	height: 22px;
	color: white;
}

.workout-card__content {
	flex: 1;
	min-width: 0;
}

.workout-card__type {
	font-weight: 600;
	margin-bottom: 0.25rem;
}

.workout-card__meta {
	font-size: 0.875rem;
	color: var(--color-text-muted);
}

.workout-card__stats {
	text-align: right;
	flex-shrink: 0;
}

.workout-card__duration {
	font-weight: 700;
	font-size: 1.125rem;
}

.workout-card__intensity {
	font-size: 0.75rem;
	color: var(--color-text-muted);
}

.workout-card__delete {
	background: none;
	border: none;
	color: var(--color-text-muted);
	cursor: pointer;
	padding: 0.5rem;
	border-radius: var(--radius-sm);
	transition: color 0.2s, background 0.2s;
}

.workout-card__delete:hover {
	color: var(--color-accent);
	background: rgba(255, 59, 48, 0.1);
}

.workout-card__delete svg {
	width: 18px;
	height: 18px;
}

@media (max-width: 600px) {
	.app {
		padding: 1rem;
	}

	.header__title {
		font-size: 2rem;
	}

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

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

	.workout-card {
		flex-wrap: wrap;
	}
}