:root {
	--bg: #f8fafc;
	--card: #ffffff;
	--text: #0f172a;
	--muted: #475569;
	--accent: #2563eb;
	--line: #e2e8f0;
	--soft: #dbeafe;
}
body {
	margin: 0;
	font-family: Arial, sans-serif;
	line-height: 1.6;
	background: #f4f7fb;
	color: #222;
}

.container {
	max-width: 900px;
	margin: 0 auto;
	padding: 40px 20px;
}

.header-section {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: 16px 24px;
	border-bottom: 2px solid #eee;
}

.title {
	margin: 20px 0 0 0;
	font-size: 1.5rem;
	font-weight: bold;
}

.logo {
	width: 80px;
	cursor: pointer;
}
.img100 {
	width: 100px;
	cursor: pointer;
}

.imgmax {
	max-width: 100%;
}

.card {
	background: #ffffff;
	border-radius: 18px;
	padding: 32px;
	box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.card-sm {
	background: #ffffff;
	border-radius: 10px;
	padding: 16px 10px;
	box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

h1 {
	margin-top: 0;
	color: #1f3a5f;
	font-size: 2rem;
}

.subtitle {
	color: #5f6f89;
	font-size: 1.1rem;
	margin-bottom: 24px;
}

.img {
	width: 100%;
	border-radius: 14px;
	margin: 20px 0;
	display: block;
}

.image-caption {
	font-size: 0.9rem;
	color: #666;
	margin-top: -10px;
	margin-bottom: 28px;
}

p {
	font-size: 1.05rem;
	margin-bottom: 18px;
}

.task-box {
	margin-top: 28px;
	padding: 18px;
	background: #eaf2ff;
	border-left: 5px solid #2f6fed;
	border-radius: 10px;
}

.task-box strong {
	color: #1f3a5f;
}

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

.table-header-cell {
	padding: 3px 7px;
	font-weight: 900;
}

.table-cell {
	border-top: #aaa solid 1px;
	padding: 3px 7px;
}

.table-cell-2 {
	padding: 3px 7px;
}

table {
	border-collapse: collapse;
	width: 100%;
	margin: 14px 0;
	background: white;
}

th,
td {
	border: 1px solid var(--line);
	padding: 8px 10px;
	text-align: left;
}

th {
	background: #eff6ff;
}

td.num {
	text-align: right;
	font-variant-numeric: tabular-nums;
}

.button-section {
	width: 100%;
	margin-top: 20px;
	display: flex;
	justify-content: flex-end;
}
.btn {
	border: none;
	padding: 8px 20px;
	font-size: 14px;
	border-radius: 8px;
	cursor: pointer;
	text-decoration: none;
	transition: all 0.2s ease;
	margin-left: 10px;
}

.btn-primary {
	background-color: #0c6696;
	color: #ffffff;
}

.btn-primary:hover {
	background-color: #095277; /* slightly darker */
}

.btn-primary:active {
	transform: scale(0.98);
}

.btn-secondary {
	background-color: #ffffff;
	color: #666;
}

.btn-secondary:hover {
	background-color: #ddd; /* slightly darker */
}

.btn-secondary:active {
	transform: scale(0.98);
}

.flex {
	display: flex;
	flex-direction: row;
	gap: 10px;
}
.flex-1 {
	flex-grow: 1;
}

.fill {
	flex-grow: 1;
	min-width: 0;
}
.grid-2 {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 16px;
}
.grid-3 {
	display: grid;
	grid-template-columns: 1fr 1fr 1fr;
	gap: 16px;
}
.grid-4 {
	display: grid;
	grid-template-columns: 1fr 1fr 1fr 1fr;
	gap: 16px;
}

.steps {
	background: #f1f5f9;
	border-radius: 14px;
	padding: 14px 18px;
}

.steps li {
	margin: 7px 0;
}

code {
	background: #e2e8f0;
	border-radius: 6px;
	padding: 2px 5px;
}
.footer {
	margin: 20px 0 0 0;
}
.cat-grid td {
	width: 28px;
	height: 28px;
	text-align: center;
	padding: 0;
	font-size: 12px;
}

.legend span {
	display: inline-block;
	margin-right: 12px;
}

.c0 {
	background: #ffffff;
}

.c1 {
	background: #f59e0b;
}

.c2 {
	background: #0f172a;
	color: white;
}

.c3 {
	background: #fbbf24;
}

.c4 {
	background: #fef3c7;
}

.c5 {
	background: #22c55e;
}

.content {
	display: none;
}

#toggle:checked ~ .content {
	display: block;
}
.tag {
	display: inline-block;
	background: var(--soft);
	color: #1e40af;
	border-radius: 999px;
	padding: 4px 10px;
	font-weight: 700;
	font-size: 0.85rem;
	margin: 3px 4px 3px 0;
}
.bold {
	font-weight: 700;
}
.img-shadow {
	border: 1px solid #ddd;
	box-shadow: 0 5px 10px rgba(0, 0, 0, 0.08);
	margin: 16px 0;
}