:root {
	color-scheme: light dark;
	--bg-canvas: #f8fafc;
	--bg-surface: #ffffff;
	--bg-elevated: #ffffff;
	--text-primary: #0f172a;
	--text-muted: #475569;
	--text-subtle: #94a3b8;
	--border-default: #e2e8f0;
	--border-strong: #cbd5e1;

	--brand-50: #eef0fb;
	--brand-100: #dde0f7;
	--brand-500: #7b85dc;
	--brand-600: #5e6ad2;
	--brand-700: #4a56c0;
	--brand-fg: #5e6ad2;

	--danger: #dc2626;
	--success: #16a34a;
	--amber: #f59e0b;
	--cyan: #06b6d4;

	--radius-sm: 4px;
	--radius-md: 6px;
	--radius-lg: 10px;
	--radius-xl: 14px;

	--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Inter", system-ui, sans-serif;
	--font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

	--shadow-xs: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
	--shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.06);
	--shadow-md: 0 4px 6px -2px rgba(15, 23, 42, 0.06);
	--shadow-xl: 0 12px 24px -4px rgba(15, 23, 42, 0.12);
}

@media (prefers-color-scheme: dark) {
	:root {
		--bg-canvas: #090d16;
		--bg-surface: #111827;
		--bg-elevated: #1a2234;
		--text-primary: #f1f5f9;
		--text-muted: #94a3b8;
		--text-subtle: #64748b;
		--border-default: #1f293d;
		--border-strong: #334155;

		--brand-50: rgba(94, 106, 210, 0.16);
		--brand-100: rgba(94, 106, 210, 0.25);
		--brand-fg: #a5b4fc;
		--shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
		--shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
		--shadow-md: 0 4px 6px -2px rgba(0, 0, 0, 0.5);
		--shadow-xl: 0 12px 24px -4px rgba(0, 0, 0, 0.6);
	}
}

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

body {
	background: var(--bg-canvas);
	color: var(--text-primary);
	font-family: var(--font-sans);
	font-size: 13px;
	line-height: 1.45;
	-webkit-font-smoothing: antialiased;
}

/* Utilities */
.bg-canvas { background-color: var(--bg-canvas); }
.bg-surface { background-color: var(--bg-surface); }
.font-mono { font-family: var(--font-mono); }

/* Buttons */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 6px;
	font-family: var(--font-sans);
	font-size: 13px;
	font-weight: 500;
	border-radius: var(--radius-md);
	border: 1px solid transparent;
	padding: 6px 12px;
	cursor: pointer;
	transition: all 120ms ease-out;
	user-select: none;
}

.btn:focus-visible {
	outline: 2px solid var(--brand-fg);
	outline-offset: 2px;
}

.btn-primary {
	background: var(--brand-600);
	color: #ffffff;
}

.btn-primary:hover {
	background: var(--brand-700);
}

.btn-secondary {
	background: var(--bg-surface);
	color: var(--text-primary);
	border-color: var(--border-default);
}

.btn-secondary:hover {
	background: var(--brand-50);
	border-color: var(--border-strong);
}

.btn-pro {
	background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
	color: #ffffff;
	font-weight: 600;
	box-shadow: 0 2px 4px rgba(245, 158, 11, 0.25);
}

.btn-pro:hover {
	filter: brightness(1.08);
}

/* Inputs & Form */
.input,
.select,
.textarea {
	width: 100%;
	padding: 7px 10px;
	font-size: 13px;
	font-family: var(--font-sans);
	border: 1px solid var(--border-default);
	border-radius: var(--radius-md);
	background: var(--bg-surface);
	color: var(--text-primary);
	transition: border-color 120ms ease-out, box-shadow 120ms ease-out;
}

.input:focus,
.select:focus,
.textarea:focus {
	outline: none;
	border-color: var(--brand-fg);
	box-shadow: 0 0 0 3px rgba(94, 106, 210, 0.18);
}

/* Badges */
.badge {
	display: inline-flex;
	align-items: center;
	gap: 4px;
	padding: 2px 7px;
	border-radius: 999px;
	font-size: 11px;
	font-weight: 600;
}

.badge-pro {
	background: rgba(245, 158, 11, 0.15);
	color: #d97706;
	border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge-free {
	background: var(--brand-50);
	color: var(--text-muted);
	border: 1px solid var(--border-default);
}

/* KPI Cards */
.kpi-card {
	background: var(--bg-surface);
	border: 1px solid var(--border-default);
	border-radius: var(--radius-lg);
	padding: 12px 14px;
	display: flex;
	flex-direction: column;
	box-shadow: var(--shadow-xs);
}

.kpi-label {
	font-size: 11px;
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.03em;
	color: var(--text-muted);
}

.kpi-val {
	font-size: 20px;
	font-weight: 700;
	font-family: var(--font-mono);
	letter-spacing: -0.02em;
	color: var(--text-primary);
}

/* Progress Bars */
.progress-bar-bg {
	width: 100%;
	height: 5px;
	background: var(--border-default);
	border-radius: 999px;
	overflow: hidden;
}

.progress-bar-fill {
	height: 100%;
	background: var(--brand-600);
	border-radius: 999px;
	transition: width 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Tabs */
.tab-btn {
	padding: 5px 12px;
	font-size: 12px;
	font-weight: 500;
	border-radius: var(--radius-md);
	border: none;
	background: transparent;
	color: var(--text-muted);
	cursor: pointer;
	transition: all 120ms ease;
}

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

.tab-btn-active {
	background: var(--bg-surface);
	color: var(--text-primary);
	font-weight: 600;
	box-shadow: var(--shadow-xs);
}

/* Habit Card */
.habit-card {
	background: var(--bg-surface);
	border: 1px solid var(--border-default);
	border-radius: var(--radius-lg);
	padding: 14px 16px;
	box-shadow: var(--shadow-xs);
	transition: border-color 120ms ease, box-shadow 120ms ease;
}

.habit-card:hover {
	border-color: var(--border-strong);
	box-shadow: var(--shadow-sm);
}

/* Check Button */
.check-button {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	padding: 6px 12px;
	border-radius: var(--radius-md);
	border: 1px solid transparent;
	cursor: pointer;
	transition: all 150ms ease;
	user-select: none;
}

.check-button-pending {
	background: var(--bg-surface);
	border-color: var(--border-strong);
	color: var(--text-primary);
}

.check-button-pending:hover {
	background: var(--brand-50);
	border-color: var(--brand-600);
	color: var(--brand-fg);
}

.check-button-done {
	background: var(--success);
	color: #ffffff;
	box-shadow: 0 1px 3px rgba(22, 163, 74, 0.3);
}

/* Modals */
.modal-overlay {
	position: fixed;
	inset: 0;
	z-index: 50;
	background: rgba(15, 23, 42, 0.45);
	backdrop-filter: blur(2px);
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 16px;
}

.modal-content {
	background: var(--bg-surface);
	border: 1px solid var(--border-default);
	border-radius: var(--radius-xl);
	padding: 20px 24px;
	width: 100%;
	max-width: 440px;
	box-shadow: var(--shadow-xl);
	animation: modal-enter 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modal-enter {
	from { opacity: 0; transform: scale(0.96) translateY(6px); }
	to { opacity: 1; transform: scale(1) translateY(0); }
}

.pro-feature-item {
	display: flex;
	align-items: flex-start;
	gap: 10px;
	padding: 8px 10px;
	border-radius: var(--radius-md);
	background: var(--bg-canvas);
}

/* Loading & Alerts */
.loading {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	padding: 24px;
	color: var(--text-muted);
}

.spinner {
	width: 16px;
	height: 16px;
	border: 2px solid var(--border-default);
	border-top-color: var(--brand-fg);
	border-radius: 50%;
	animation: fab-spin 0.75s linear infinite;
}

@keyframes fab-spin {
	to { transform: rotate(360deg); }
}

.alert {
	padding: 10px 14px;
	border-radius: var(--radius-md);
	border: 1px solid var(--border-default);
	font-size: 12px;
}

.alert-error {
	background: rgba(220, 38, 38, 0.08);
	border-color: rgba(220, 38, 38, 0.25);
	color: var(--danger);
}

.empty {
	padding: 32px 16px;
	text-align: center;
}

.empty-title {
	font-size: 15px;
	font-weight: 600;
	color: var(--text-primary);
	margin-bottom: 4px;
}

.hint {
	font-size: 13px;
	color: var(--text-muted);
}