/* VoltInsight Calculators — 배터리 직렬·병렬 계산기. 원본 인라인 스타일(post 106)을 클래스 스코프로 이관. */
.vi-sp-calc {
	max-width: 920px;
	margin: 28px auto;
	color: #1f2937;
	line-height: 1.65;
}
.vi-sp-calc * {
	box-sizing: border-box;
}
.vi-sp-calc .vi-sp-hero,
.vi-sp-calc .vi-sp-card {
	border: 1px solid #e5e7eb;
	border-radius: 18px;
	background: #fff;
}
.vi-sp-calc .vi-sp-hero {
	padding: 26px;
	margin-bottom: 18px;
}
.vi-sp-calc .vi-sp-title {
	font-size: clamp(24px, 4vw, 34px);
	font-weight: 800;
	line-height: 1.3;
	margin-bottom: 8px;
}
.vi-sp-calc h2 {
	font-size: 21px;
	margin: 0 0 8px;
}
.vi-sp-calc h3 {
	font-size: 19px;
	margin: 26px 0 10px;
}
.vi-sp-calc p {
	margin: 7px 0;
}
.vi-sp-calc .vi-sp-muted {
	color: #4b5563;
	font-size: 14px;
}
.vi-sp-calc .vi-sp-grid {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 16px;
}
.vi-sp-calc .vi-sp-card {
	padding: 22px;
}
.vi-sp-calc label {
	display: block;
	font-weight: 700;
	font-size: 14px;
	margin: 13px 0 6px;
}
.vi-sp-calc input {
	width: 100%;
	padding: 12px 13px;
	border: 1px solid #d1d5db;
	border-radius: 10px;
	background: #fff;
	font-size: 16px;
	color: #111827;
}
.vi-sp-calc input:focus-visible {
	outline: 2px solid #9ca3af;
	outline-offset: 1px;
}
.vi-sp-calc button {
	width: 100%;
	margin-top: 18px;
	padding: 13px 15px;
	border: 0;
	border-radius: 10px;
	background: #111827;
	color: #fff;
	font-size: 15px;
	font-weight: 800;
	cursor: pointer;
}
.vi-sp-calc button:hover {
	opacity: 0.9;
}
.vi-sp-calc button:focus-visible {
	outline: 3px solid #9ca3af;
	outline-offset: 2px;
}
.vi-sp-calc .vi-sp-config {
	margin-top: 18px;
	padding: 18px;
	border-radius: 14px;
	background: #f3f4f6;
	text-align: center;
}
.vi-sp-calc .vi-sp-config strong {
	display: block;
	font-size: 28px;
	color: #111827;
}
.vi-sp-calc .vi-sp-error {
	margin-top: 12px;
	padding: 12px 14px;
	border-radius: 10px;
	background: #fef2f2;
	color: #b91c1c;
	font-size: 13px;
}
.vi-sp-calc .vi-sp-error:empty {
	display: none;
}
.vi-sp-calc .vi-sp-results {
	display: grid;
	grid-template-columns: repeat(3, minmax(0, 1fr));
	gap: 10px;
	margin-top: 12px;
}
.vi-sp-calc .vi-sp-result {
	padding: 15px 12px;
	border: 1px solid #e5e7eb;
	border-radius: 12px;
	background: #fff;
}
.vi-sp-calc .vi-sp-result span {
	display: block;
	color: #4b5563;
	font-size: 12px;
	margin-bottom: 3px;
}
.vi-sp-calc .vi-sp-result strong {
	display: block;
	font-size: 18px;
	color: #111827;
	word-break: break-word;
}
.vi-sp-calc .vi-sp-formula {
	font-size: 12px;
	color: #4b5563;
	margin-top: 3px;
}
.vi-sp-calc .vi-sp-note {
	margin-top: 20px;
	padding: 18px;
	border-left: 4px solid #9ca3af;
	border-radius: 8px;
	background: #f9fafb;
}
.vi-sp-calc details {
	padding: 14px 0;
	border-bottom: 1px solid #e5e7eb;
}
.vi-sp-calc summary {
	font-weight: 800;
	cursor: pointer;
}
.vi-sp-calc summary:focus-visible {
	outline: 3px solid #9ca3af;
	outline-offset: 2px;
}
.vi-sp-calc .vi-sp-links {
	margin-top: 24px;
	padding: 18px;
	border: 1px solid #e5e7eb;
	border-radius: 14px;
}
.vi-sp-calc .vi-sp-links a {
	font-weight: 700;
	text-decoration: none;
}
@media (max-width: 760px) {
	.vi-sp-calc {
		margin: 18px 10px;
	}
	.vi-sp-calc .vi-sp-grid {
		grid-template-columns: 1fr;
	}
	.vi-sp-calc .vi-sp-results {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}
	.vi-sp-calc .vi-sp-card,
	.vi-sp-calc .vi-sp-hero {
		padding: 18px;
	}
}
@media (max-width: 460px) {
	.vi-sp-calc .vi-sp-results {
		grid-template-columns: 1fr;
	}
}