.hsv-calculator {
	--hsv-accent: #3f7d3a;
	--hsv-accent-soft: rgba(63, 125, 58, 0.18);
	--hsv-marker: #c2571a;
	--hsv-ink: #1f2a1e;
	--hsv-muted: #6b7568;
	--hsv-grid: #e3e8e1;
	--hsv-bg: #ffffff;
	--hsv-border: #d6ddd3;

	max-width: 100%;
	margin: 1.5em 0;
	padding: 1.25em 1.25em 1em;
	background: var(--hsv-bg);
	border: 1px solid var(--hsv-border);
	border-radius: 10px;
	color: var(--hsv-ink);
	box-sizing: border-box;
}

.hsv-calculator *,
.hsv-calculator *::before,
.hsv-calculator *::after {
	box-sizing: border-box;
}

.hsv-title {
	margin: 0 0 0.75em;
}

.hsv-form {
	display: flex;
	flex-wrap: wrap;
	gap: 0.75em 1em;
	align-items: flex-end;
}

.hsv-field {
	display: flex;
	flex-direction: column;
	gap: 0.3em;
	flex: 1 1 200px;
}

.hsv-field label {
	font-weight: 600;
	font-size: 0.92em;
}

.hsv-field input,
.hsv-field select {
	width: 100%;
	padding: 0.55em 0.65em;
	border: 1px solid var(--hsv-border);
	border-radius: 6px;
	font: inherit;
	background: #fff;
	color: var(--hsv-ink);
}

.hsv-field input:focus,
.hsv-field select:focus {
	outline: 2px solid var(--hsv-accent);
	outline-offset: 1px;
}

.hsv-button {
	padding: 0.6em 1.4em;
	border: 0;
	border-radius: 6px;
	background: var(--hsv-accent);
	color: #fff;
	font: inherit;
	font-weight: 600;
	cursor: pointer;
}

.hsv-button:hover,
.hsv-button:focus {
	filter: brightness(1.1);
}

.hsv-output {
	margin-top: 1.25em;
}

.hsv-output[hidden] {
	display: none;
}

.hsv-result {
	margin: 0 0 0.5em;
	font-weight: 600;
}

.hsv-chart {
	display: block;
	width: 100%;
	height: auto;
	font-family: inherit;
}

.hsv-chart .hsv-grid        { stroke: var(--hsv-grid); stroke-width: 1; }
.hsv-chart .hsv-axis        { stroke: var(--hsv-ink); stroke-width: 1.5; }
.hsv-chart .hsv-tick        { fill: var(--hsv-muted); font-size: 12px; }
.hsv-chart .hsv-axis-title  { fill: var(--hsv-ink); font-size: 13px; font-weight: 600; }
.hsv-chart .hsv-band        { fill: var(--hsv-accent-soft); stroke: none; }
.hsv-chart .hsv-curve       { fill: none; stroke: var(--hsv-accent); stroke-width: 2.5; stroke-linejoin: round; }
.hsv-chart .hsv-age-line    { stroke: var(--hsv-marker); stroke-width: 1.5; stroke-dasharray: 4 4; }
.hsv-chart .hsv-range-bar   { stroke: var(--hsv-marker); stroke-width: 6; stroke-linecap: round; opacity: 0.55; }
.hsv-chart .hsv-dot         { fill: var(--hsv-marker); stroke: #fff; stroke-width: 2; }
.hsv-chart .hsv-marker      { fill: var(--hsv-marker); }
.hsv-chart .hsv-marker-label { fill: var(--hsv-marker); font-size: 13px; font-weight: 700; }

.hsv-legend {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 0.4em;
	margin: 0.5em 0 0;
	font-size: 0.88em;
	color: var(--hsv-muted);
}

.hsv-swatch {
	display: inline-block;
	width: 22px;
	height: 12px;
	border-radius: 2px;
	vertical-align: middle;
}

.hsv-swatch-line {
	height: 3px;
	margin-left: 1em;
	background: var(--hsv-accent);
}

.hsv-swatch-band {
	background: var(--hsv-accent-soft);
}

.hsv-note {
	margin: 0.75em 0 0;
	font-size: 0.82em;
	color: var(--hsv-muted);
}