:root {
	--primary-color: #007aff;
	--background-color: #f4f5f7;
	--card-background: #ffffff;
	--text-color: #1d2b35;
	--light-text-color: #6c7a86;
	--border-color: #e5e7eb;
}

* {
	box-sizing: border-box;
}
body {
	font-family: "Noto Sans JP", sans-serif;
	font-size: 16px;
	background-color: var(--background-color);
	color: var(--text-color);
	padding: 20px;
	margin: 0;
	display: flex;
	flex-direction: column;
	align-items: center;
}

.container {
	max-width: 640px;
	width: 100%;
}

/* Logo */
.logo {
	display: block;
	text-align: center;
	margin-bottom: 25px;
}

.logo-img {
	max-width: 250px;
	height: auto;
	transition: opacity 0.3s ease;
}

.logo-img:hover {
	opacity: 0.8;
}

/* Calculator Card */
.calculator-card {
	background: var(--card-background);
	border-radius: 16px;
	padding: 30px;
	box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
	margin-bottom: 30px;
}

.header {
	text-align: center;
	margin-bottom: 30px;
}

.header h1 {
	font-family: "Poppins", sans-serif;
	font-size: 28px;
	margin-bottom: 8px;
	margin-top: 0;
}

.subtitle {
	font-size: 16px;
	color: var(--light-text-color);
}

/* Input Section */
.input-section {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 20px;
	margin-bottom: 25px;
}

.input-group label {
	display: block;
	color: var(--text-color);
	margin-bottom: 8px;
	font-size: 1.125rem;
	font-weight: 700;
}

.input-wrapper {
	position: relative;
}

.input-wrapper input {
	width: 100%;
	padding: 12px 60px 12px 15px;
	border: 1px solid var(--border-color);
	border-radius: 10px;
	font-size: 20px;
	font-weight: 700;
	color: var(--primary-color);
	transition: all 0.3s;
	font-family: "Poppins", sans-serif;
	background-color: #f9fafb;
}

.input-wrapper input:focus {
	outline: none;
	border-color: var(--primary-color);
	box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
}

.input-unit {
	position: absolute;
	right: 15px;
	top: 50%;
	transform: translateY(-50%);
	color: var(--light-text-color);
	font-weight: 500;
}

/* Divider */
.divider {
	height: 1px;
	background-color: var(--border-color);
	margin-bottom: 25px;
}

/* Result Section */
.result-section {
	display: grid;
	grid-template-columns: 1fr 1fr;
	text-align: center;
	position: relative;
}

.result-section::before {
	content: "";
	position: absolute;
	left: 50%;
	top: 10%;
	bottom: 10%;
	width: 1px;
	background-color: var(--border-color);
	transform: translateX(-50%);
}

.result-item h2 {
	font-size: 16px;
	font-weight: 700;
	color: var(--light-text-color);
	margin-bottom: 10px;
}

.result-line {
	font-size: 1.2rem;
	line-height: 1.4;
}

.result-highlight {
	font-family: "Poppins", sans-serif;
	font-size: 36px;
	font-weight: 700;
	color: var(--primary-color);
	margin: 0 4px;
}

.result-subline {
	color: var(--light-text-color);
	margin-top: 5px;
}

/* Info Section (Accordion) */
.info-section {
	margin-bottom: 30px;
}
.accordion-item {
	background: var(--card-background);
	border: 1px solid var(--border-color);
	border-radius: 12px;
	margin-bottom: 10px;
	overflow: hidden;
}
.accordion-header {
	width: 100%;
	background: transparent;
	border: none;
	padding: 15px 20px;
	font-size: 16px;
	font-weight: 700;
	text-align: left;
	cursor: pointer;
	display: flex;
	justify-content: space-between;
	align-items: center;
	color: var(--text-color);
}
.accordion-header::after {
	content: "+";
	font-size: 20px;
	color: var(--primary-color);
	transition: transform 0.3s ease;
}
.accordion-header.active::after {
	transform: rotate(45deg);
}
.accordion-content {
	max-height: 0;
	overflow: hidden;
	transition: max-height 0.3s ease-out;
	padding: 0 20px;
	color: var(--light-text-color);
	line-height: 1.8;
}
.accordion-header.active + .accordion-content {
	padding-top: 5px;
	padding-bottom: 20px;
}
.accordion-content p,
.accordion-content ul {
	margin-bottom: 15px;
}
.accordion-content ul {
	margin-left: 0px;
}
.calculation-note {
	background: #fffbeb;
	border-left: 4px solid #f59e0b;
	padding: 15px;
	margin-top: 10px;
	border-radius: 5px;
}
.calculation-note h4 {
	color: #b45309;
	margin-bottom: 8px;
	margin-top: 0;
}
.calculation-note ul {
	color: #92400e;
	line-height: 1.6;
	list-style-position: inside;
	padding-left: 0;
	margin-bottom: 0;
}

/* Links Section */
.links-section {
	text-align: center;
}

.links-section h2 {
	font-size: 1.25rem;
	margin: 40px 0 20px;
	color: var(--text-color);
}

.link-cards {
	display: grid;
	grid-template-columns: 1fr;
	gap: 15px;
}

.link-card {
	background: var(--card-background);
	border-radius: 12px;
	padding: 20px;
	text-decoration: none;
	color: var(--text-color);
	transition: all 0.3s;
	border: 1px solid var(--border-color);
}

.link-card:hover {
	transform: translateY(-5px);
	box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
	border-color: var(--primary-color);
}

.link-icon {
	font-size: 28px;
	margin-bottom: 10px;
}

.link-title {
	font-weight: 700;
	color: var(--text-color);
	margin-bottom: 5px;
}

.link-description {
	color: var(--light-text-color);
	line-height: 1.5;
	font-size: 0.9rem;
}

/* --- 関連コンテンツ & フッター --- */
.related-content,
footer {
	width: 100%;
	margin-top: 40px;
	text-align: center;
}

.article-link {
	display: block;
	background-color: #eaf5fc;
	border: 1px solid var(--primary-color);
	border-radius: 10px;
	padding: 20px;
	margin-bottom: 30px;
	text-decoration: none;
	color: var(--text-color);
	transition: all 0.3s ease;
}

.article-link:hover {
	box-shadow: 0 5px 15px rgba(52, 152, 219, 0.2);
	transform: translateY(-3px);
}

.article-link-title {
	display: block;
	font-size: 0.8em;
	font-weight: 700;
	color: var(--primary-color);
	margin-bottom: 8px;
}

.article-link-text {
	display: block;
	font-size: 1.1em;
	font-weight: 700;
}

.other-links h2 {
	font-size: 1.2em;
	margin-bottom: 15px;
}

.other-links {
	display: grid;
	gap: 10px;
}

.tool-link {
	display: block;
	background-color: var(--card-background);
	padding: 15px;
	border-radius: 8px;
	border: 1px solid var(--border-color);
	text-decoration: none;
	font-weight: 700;
	color: var(--text-color);
	transition: all 0.3s ease;
}

.tool-link:hover {
	background-color: var(--primary-color);
	color: #fff;
	border-color: var(--primary-color);
}

.contact-section {
	padding: 20px;
	border-top: 1px solid var(--border-color);
}

.contact-section p {
	color: var(--light-text-color);
	font-size: 0.85em;
	line-height: 1.7;
	margin: 0 0 15px 0;
}

.contact-link {
	display: inline-block;
	background-color: rgb(240, 243, 244);
	color: var(--text-color);
	padding: 12px 25px;
	border-radius: 8px;
	text-decoration: none;
	font-weight: 700;
	transition: all 0.3s ease;
}

.contact-link:hover {
	background-color: #e5e9ea;
}

.copyright {
	font-size: 0.8em;
	color: var(--light-text-color);
	margin-top: 20px;
	text-align: center;
}
/* Media Queries */
@media (max-width: 680px) {
	.input-section {
		grid-template-columns: 1fr;
		gap: 25px;
	}
	.result-section {
		grid-template-columns: 1fr;
		gap: 25px;
	}
	.result-section::before {
		display: none;
	}
	.result-item:first-child {
		padding-bottom: 25px;
		border-bottom: 1px solid var(--border-color);
	}
	.header h1 {
		font-size: 24px;
	}
	.calculator-card {
		padding: 25px;
	}
	.result-highlight {
		font-size: 32px;
	}
}
/* Media Queries */
@media (max-width: 680px) {
	.input-section {
		grid-template-columns: 1fr;
		gap: 25px;
	}
	.input-wrapper input {
		max-width: 100%;
	}
	.result-section {
		grid-template-columns: 1fr;
		gap: 25px;
	}
	.result-section::before {
		display: none;
	}
	.result-item:first-child {
		padding-bottom: 25px;
		border-bottom: 1px solid var(--border-color);
	}
	.header h1 {
		font-size: 24px;
	}
	.calculator-card {
		padding: 25px;
	}
	.result-highlight {
		font-size: 32px;
	}
}