:root {
	--bg: #f4f7fa;
	--text: #1a1a1a;
	--card: #ffffff;
	--accent: #3b82f6;

	--input-bg: #ffffff;
	--input-text: #000;

	--border: #e5e7eb;

	--ok: #22c55e;
	--danger: #ef4444;
}

body.dark-mode {
	--bg: #0f0f11;
	--text: #e8e8f0;
	--card: #1e1e1e;
	--accent: #6bb6ff;

	--input-bg: #2e2e2e;
	--input-text: #fff;

	--border: #2a2a2a;
}

html,
body {
	height: 100%;
	margin: 0;
	font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
}

body {
	background: var(--bg);
	color: var(--text);
	transition: all 0.3s ease;
}

.container {
	max-width: 1050px;
	margin: 28px auto;
	padding: 20px;
}

header {
	text-align: center;
	margin-bottom: 14px;
}

h1 {
	font-size: 26px;
	margin: 0;
	color: var(--accent);
	font-weight: 800;
}

.credit-wrap {
	margin-top: 8px;
	display: flex;
	justify-content: center;
}

.credit {
	display: inline-flex;
	align-items: center;
	gap: 8px;

	padding: 8px 16px;
	border-radius: 999px;

	background: rgba(0, 0, 0, 0.05);
	color: var(--accent);

	font-weight: 500;
	text-decoration: none;
	transition: all 0.25s ease;
}

body.dark-mode .credit {
	background: rgba(255, 255, 255, 0.06);
}

.credit:hover {
	transform: translateY(-1px);
	background: rgba(0, 0, 0, 0.08);
}

body.dark-mode .credit:hover {
	background: rgba(255, 255, 255, 0.12);
}

.gh-icon {
	width: 16px;
	height: 16px;
	fill: currentColor;
}

.tabs {
	display: flex;
	gap: 10px;
	margin: 18px 0;
}

.tab {
	flex: 1;
	padding: 10px 14px;
	border-radius: 8px;
	background: var(--card);
	text-align: center;
	cursor: pointer;
	font-weight: 600;
	color: var(--text);
	border: 1px solid var(--border);
}

.tab.active.hybrid {
	background: #ef4444;
	color: #fff;
}

.tab.active.theory {
	background: var(--accent);
	color: #fff;
}

.tab.active.practical {
	background: var(--ok);
	color: #fff;
}

.card {
	background: var(--card);
	border-radius: 14px;
	padding: 18px;
	box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

.grid {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 14px;
}

.section {
	padding: 12px;
	border-radius: 10px;
	background: var(--card);
	border: 1px solid var(--border);
}

label {
	display: block;
	font-size: 13px;
	color: var(--text);
	margin-bottom: 6px;
}

input[type=number] {
	width: 100%;
	padding: 10px 12px;
	border-radius: 8px;
	border: 1px solid var(--border);
	background: var(--input-bg);
	color: var(--input-text);
	font-weight: 600;
	box-sizing: border-box;
}

.controls {
	display: flex;
	gap: 10px;
	margin-top: 16px;
}

button {
	padding: 10px 14px;
	border-radius: 8px;
	border: none;
	cursor: pointer;
	font-weight: 700;
}

.btn-reset {
	background: var(--danger);
	color: white;
}

.btn-calc {
	background: var(--ok);
	color: white;
	margin-left: auto;
}

.result {
	margin-top: 16px;
	background: var(--card);
	padding: 12px;
	border-radius: 10px;
	border: 1px solid var(--border);
}

.line {
	display: flex;
	justify-content: space-between;
	padding: 6px 0;
}

.bar {
	height: 12px;
	background: #ddd;
	border-radius: 8px;
	overflow: hidden;
	margin-top: 8px;
}

body.dark-mode .bar {
	background: #2a2a2a;
}

.bar>i {
	display: block;
	height: 100%;
	background: linear-gradient(90deg, #3b82f6, #22c55e);
}

.small {
	font-size: 13px;
	color: #666;
}

body.dark-mode .small {
	color: #aaa;
}

.break {
	margin-top: 10px;
	border-top: 1px dashed var(--border);
	padding-top: 10px;
}

.invalid {
	border: 1px solid var(--danger) !important;
}

.error-msg {
	color: var(--danger);
	font-size: 12px;
	margin-top: 6px;
	display: none;
}

.error-msg.show {
	display: block;
}

.toggle-btn {
	position: fixed;
	top: 20px;
	right: 20px;
	background: var(--card);
	color: var(--text);
	border: 1px solid var(--border);
	padding: 8px 12px;
	border-radius: 8px;
	cursor: pointer;
	z-index: 1000;
}

@media (max-width:1000px) {
	.grid {
		grid-template-columns: 1fr;
	}

	.tabs {
		flex-direction: column;
	}

	.controls {
		flex-direction: row-reverse;
	}
}

label {
	color: var(--text);
}

h3 {
	color: var(--text);
}

* {
	box-sizing: border-box;
}

.section-title {
	margin: 0 0 8px;
	font-weight: 700;
	font-size: 16px;
	color: var(--text);
	letter-spacing: 0.3px;
}