.dvt-calculator {
	--dvt-navy: #0b1526;
	--dvt-panel: #142238;
	--dvt-panel-hover: #1b2c47;
	--dvt-border: #223452;
	--dvt-text-soft: #7c8aa6;
	--dvt-teal: #2dd4bf;
	--dvt-teal-deep: #26b3a1;

	max-width: 460px;
	margin: 24px 0;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	box-sizing: border-box;
}

.dvt-calculator *,
.dvt-calculator *::before,
.dvt-calculator *::after {
	box-sizing: inherit;
}

.dvt-panel {
	background: var(--dvt-navy);
	border: 1px solid var(--dvt-border);
	border-radius: 18px;
	overflow: hidden;
	box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.dvt-header {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 18px 22px;
	border-bottom: 1px solid var(--dvt-border);
}

.dvt-header-icon {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 34px;
	height: 26px;
	border-radius: 8px;
	border: 1.5px solid var(--dvt-teal);
	color: var(--dvt-teal);
	font-size: 15px;
	font-style: italic;
	font-weight: 700;
	flex-shrink: 0;
}

.dvt-heading {
	margin: 0;
	font-size: 16px;
	font-weight: 700;
	color: #ffffff;
	letter-spacing: -0.01em;
}

.dvt-body {
	padding: 20px 22px 22px;
}

.dvt-equation-display {
	margin: 0 0 12px;
	padding: 10px 14px;
	background: var(--dvt-panel);
	border: 1px solid var(--dvt-border);
	border-radius: 10px;
	text-align: center;
	font-size: 15px;
	font-weight: 700;
	color: var(--dvt-teal);
}

.dvt-field-hint {
	margin: 0 0 16px;
	font-size: 12px;
	color: var(--dvt-text-soft);
	line-height: 1.5;
}

.dvt-field-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 10px;
}

.dvt-field {
	display: flex;
	flex-direction: column;
	gap: 6px;
}

.dvt-var-toggle {
	padding: 8px 6px;
	font-size: 11px;
	font-weight: 700;
	font-family: inherit;
	border: 1px solid var(--dvt-border);
	border-radius: 8px;
	background: var(--dvt-panel);
	color: var(--dvt-text-soft);
	cursor: pointer;
	transition: background 0.15s ease, color 0.15s ease;
}

.dvt-var-toggle:hover {
	background: var(--dvt-panel-hover);
	color: #ffffff;
}

.dvt-var-toggle.is-active {
	background: var(--dvt-teal);
	color: #06231f;
	border-color: var(--dvt-teal);
}

.dvt-input {
	width: 100%;
	padding: 11px 12px;
	font-size: 14px;
	font-family: inherit;
	font-variant-numeric: tabular-nums;
	text-align: center;
	border: none;
	background: #ffffff;
	border-radius: 10px;
	color: var(--dvt-navy);
	transition: box-shadow 0.15s ease;
}

.dvt-input:disabled {
	background: var(--dvt-teal);
	color: #06231f;
	font-weight: 700;
	opacity: 1;
}

.dvt-input:focus {
	outline: none;
	box-shadow: 0 0 0 3px rgba(45, 212, 191, 0.45);
}

.dvt-example-note {
	margin: 14px 0 0;
	font-size: 11.5px;
	font-style: italic;
	color: var(--dvt-teal);
	text-align: center;
}

.dvt-button-row {
	display: flex;
	gap: 10px;
	margin-top: 14px;
}

.dvt-btn {
	flex: 1;
	padding: 12px 18px;
	font-size: 14px;
	font-weight: 700;
	font-family: inherit;
	border: none;
	border-radius: 10px;
	cursor: pointer;
	transition: background 0.15s ease, transform 0.05s ease;
}

.dvt-btn-primary {
	background: var(--dvt-teal);
	color: #06231f;
}

.dvt-btn-primary:hover {
	background: var(--dvt-teal-deep);
}

.dvt-btn-ghost {
	background: var(--dvt-panel);
	color: #ffffff;
	border: 1px solid var(--dvt-border);
}

.dvt-btn-ghost:hover {
	background: var(--dvt-panel-hover);
}

.dvt-btn:active {
	transform: translateY(1px);
}

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

.dvt-error {
	min-height: 16px;
	margin: 12px 0 0;
	font-size: 13px;
	font-weight: 600;
	color: #ff9d8a;
	text-align: center;
}

/* Results */
.dvt-results:not(.has-result) {
	display: none;
}

.dvt-answer-box {
	text-align: center;
	margin-top: 22px;
	padding: 16px;
	background: var(--dvt-panel);
	border: 1px solid var(--dvt-border);
	border-radius: 12px;
}

.dvt-answer-label {
	display: block;
	font-size: 10px;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	color: var(--dvt-text-soft);
	margin-bottom: 8px;
}

.dvt-answer-value {
	display: block;
	font-size: 26px;
	font-weight: 800;
	font-variant-numeric: tabular-nums;
	letter-spacing: -0.02em;
	color: var(--dvt-teal);
}

/* Solution */
.dvt-solution {
	margin-top: 22px;
}

.dvt-section-title {
	margin: 0 0 14px;
	font-size: 13px;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.04em;
	color: var(--dvt-text-soft);
}

.dvt-step {
	margin-bottom: 12px;
}

.dvt-step:last-child {
	margin-bottom: 0;
}

.dvt-step p {
	margin: 0 0 6px;
	font-size: 13px;
	color: var(--dvt-text-soft);
	line-height: 1.5;
}

.dvt-formula {
	font-size: 13px;
	font-weight: 700;
	font-variant-numeric: tabular-nums;
	color: #ffffff !important;
	background: var(--dvt-panel);
	border: 1px solid var(--dvt-border);
	padding: 8px 12px;
	border-radius: 8px;
	display: inline-block;
	word-break: break-word;
	line-height: 1.7;
}

.dvt-formula strong {
	color: var(--dvt-teal);
}

@media (prefers-reduced-motion: reduce) {
	.dvt-btn,
	.dvt-var-toggle {
		transition: none;
	}
}