body {
	font-family: Arial, sans-serif;
	margin: 16px;
	padding-right: 300px;
	color: #1f2937;
}

.status-bar {
	padding: 10px 12px;
	background: #f3f4f6;
	border: 1px solid #d1d5db;
	margin-bottom: 12px;
}

.status-bar .warning {
	color: #92400e;
	font-weight: bold;
}

.status-bar .error {
	color: #991b1b;
	font-weight: bold;
}

.simplex-form {
	margin-bottom: 16px;
}

.panel-grid {
	display: grid;
	grid-template-columns: 2fr 1fr;
	gap: 12px;
}

.panel {
	border: 1px solid #d1d5db;
	padding: 12px;
	background: #ffffff;
}

.panel h2 {
	margin: 0 0 10px 0;
	font-size: 18px;
}

.panel label {
	display: block;
	font-weight: bold;
	margin: 8px 0 4px 0;
}

.panel input[type="text"],
.panel input[type="number"],
.panel textarea {
	width: 100%;
	box-sizing: border-box;
	padding: 8px;
	border: 1px solid #9ca3af;
}

.panel button {
	margin-top: 10px;
	padding: 8px 14px;
	border: 1px solid #1d4ed8;
	background: #2563eb;
	color: #fff;
	cursor: pointer;
}

.setting {
	margin-bottom: 10px;
}

.panel-settings {
	position: fixed;
	top: 16px;
	right: 16px;
	z-index: 10;
	width: 260px;
	box-shadow: 0 8px 20px rgba(31, 41, 55, 0.18);
}

.settings-header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 8px;
}

.settings-header h2 {
	margin: 0;
}

.settings-toggle {
	border: 1px solid #9ca3af;
	background: #f9fafb;
	color: #1f2937;
	cursor: pointer;
	padding: 4px 8px;
}

.panel-settings.is-collapsed .settings-content {
	display: none;
}

.panel-settings.is-collapsed {
	width: auto;
	min-width: 190px;
}

.setting-label {
	display: block;
	font-weight: bold;
	margin-bottom: 4px;
}

.setting label {
	font-weight: normal;
	margin: 3px 0;
}

.hint {
	font-size: 12px;
	color: #4b5563;
}

.problem-summary {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 12px;
	margin-bottom: 10px;
}

.step-card {
	border: 1px solid #d1d5db;
	margin-bottom: 12px;
	background: #fff;
}

.step-card h3 {
	margin: 0;
	padding: 8px 10px;
	background: #f3f4f6;
	border-bottom: 1px solid #d1d5db;
}

.step-meta {
	padding: 8px 10px;
	font-size: 13px;
	border-bottom: 1px solid #e5e7eb;
}

.pivot-explanation {
	padding: 8px 10px;
	background: #f9fafb;
	border-bottom: 1px solid #e5e7eb;
	font-size: 13px;
}

.ratio-details {
	color: #4b5563;
	font-size: 12px;
}

.ratio-calculation {
	color: #1d4ed8;
	display: block;
	font-size: 12px;
	margin-top: 2px;
	overflow-wrap: anywhere;
	white-space: normal;
}

.ratio-selected {
	font-weight: bold;
}

.step-card table {
	width: 100%;
	border-collapse: collapse;
	table-layout: fixed;
}

.step-card td,
.step-card th {
	border: 1px solid #d1d5db;
	padding: 4px;
	overflow-wrap: anywhere;
}

.calc-expression {
	color: #4b5563;
	display: block;
	font-size: 12px;
	overflow-wrap: anywhere;
	white-space: normal;
}

.cst-cell {
	min-width: 90px;
	vertical-align: top;
}

@media (max-width: 900px) {
	body {
		padding-right: 0;
	}

	.panel-grid,
	.problem-summary {
		grid-template-columns: 1fr;
	}

	.panel-settings {
		position: sticky;
		top: 8px;
		right: auto;
		width: auto;
		margin-bottom: 12px;
	}
}