/* =========================================================
   hakushu テーマ - assets/css/main.css
   DESIGN.md の "Vitality Flow" デザインシステムに基づく実装
   ========================================================= */

:root {
	--color-surface: #f8fafa;
	--color-surface-dim: #d8dada;
	--color-surface-bright: #f8fafa;
	--color-surface-container-lowest: #ffffff;
	--color-surface-container-low: #f2f4f4;
	--color-surface-container: #eceeee;
	--color-surface-container-high: #e6e8e8;
	--color-surface-container-highest: #e1e3e3;
	--color-on-surface: #191c1d;
	--color-on-surface-variant: #3f484a;
	--color-outline: #6f797a;
	--color-outline-variant: #bfc8c9;

	--color-primary: #004349;
	--color-on-primary: #ffffff;
	--color-primary-container: #0d5c63;
	--color-on-primary-container: #90d2da;

	--color-secondary: #8e4e14;
	--color-on-secondary: #ffffff;

	--color-line: #06c755;
	--color-accent-shop: #f4a261;

	--radius-sm: 0.25rem;
	--radius-default: 0.5rem;
	--radius-md: 0.75rem;
	--radius-lg: 1rem;
	--radius-xl: 1.5rem;
	--radius-full: 9999px;

	--gutter: 1.5rem;
	--container-max: 1024px;
	--section-gap: 4rem;
	--stack-sm: 0.5rem;
	--stack-md: 1rem;

	--font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Hiragino Kaku Gothic ProN', 'Yu Gothic', sans-serif;

	--shadow-card: 0 4px 20px rgba(0, 0, 0, 0.05);
	--shadow-card-active: 0 10px 30px rgba(0, 0, 0, 0.08);
}

/* ---------------------------------------------------------
   Base
   --------------------------------------------------------- */
* ,
*::before,
*::after {
	box-sizing: border-box;
}

html {
	scroll-behavior: smooth;
}

body {
	margin: 0;
	padding-top: 4rem; /* sticky header height */
	background-color: var(--color-surface);
	color: var(--color-on-surface);
	font-family: var(--font-family);
	font-size: 16px;
	line-height: 1.6;
	-webkit-font-smoothing: antialiased;
}

a {
	text-decoration: none;
	color: inherit;
}

img {
	max-width: 100%;
	height: auto;
	display: block;
}

.material-symbols-outlined {
	font-variation-settings: 'FILL' 0, 'wght' 400, 'GRAD' 0, 'opsz' 24;
	line-height: 1;
}

/* ---------------------------------------------------------
   Sticky Header
   --------------------------------------------------------- */
.site-header {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 50;
	height: 4rem;
	display: flex;
	align-items: center;
	justify-content: space-between;
	max-width: 100%;
	margin: 0 auto;
	padding: 0 var(--gutter);
	background-color: var(--color-surface-container-lowest);
	border-bottom: 1px solid var(--color-outline-variant);
	box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
	width: 100%;
}

.site-logo {
	font-size: 24px;
	font-weight: 700;
	color: var(--color-primary);
}

.site-logo img {
	max-height: 40px;
	width: auto;
}

.btn-shop-return,
.header-nav-menu a {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.5rem 1rem;
	background-color: var(--color-secondary);
	color: var(--color-on-secondary);
	border-radius: var(--radius-default);
	font-size: 14px;
	font-weight: 600;
	letter-spacing: 0.05em;
	transition: opacity 0.2s ease;
}
.btn-shop-return:hover,
.header-nav-menu a:hover {
	opacity: 0.9;
}

.header-nav-menu {
	display: flex;
	list-style: none;
	margin: 0;
	padding: 0;
	gap: 0.5rem;
}

/* ---------------------------------------------------------
   Layout helpers
   --------------------------------------------------------- */
.site-main {
	max-width: var(--container-max);
	margin: 0 auto;
	padding: var(--section-gap) var(--gutter);
	display: block;
}

.generic-content {
	max-width: var(--container-max);
	margin: 0 auto;
	padding: var(--section-gap) var(--gutter);
}

.entry-title {
	font-size: 32px;
	font-weight: 700;
	color: var(--color-primary);
	margin: 0 0 1.5rem;
}

.section-heading {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	font-size: 24px;
	font-weight: 600;
	color: var(--color-primary);
	border-bottom: 1px solid var(--color-outline-variant);
	padding-bottom: 0.5rem;
	margin: 0 0 1.5rem;
}

/* ---------------------------------------------------------
   Hero
   --------------------------------------------------------- */
.hero {
	text-align: center;
	margin-bottom: 2rem;
}

.hero-title {
	font-size: 32px;
	font-weight: 700;
	line-height: 1.2;
	color: var(--color-primary);
	margin: 0 0 1rem;
}

.hero-subtitle {
	font-size: 18px;
	color: var(--color-on-surface-variant);
	max-width: 40rem;
	margin: 0 auto 2rem;
}

@media (min-width: 768px) {
	.hero-title {
		font-size: 48px;
		letter-spacing: -0.02em;
	}
}

/* ---------------------------------------------------------
   Category Quick Nav
   --------------------------------------------------------- */
.category-nav {
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: 1rem;
	margin-bottom: 4rem;
}

@media (min-width: 768px) {
	.category-nav {
		grid-template-columns: repeat(4, 1fr);
	}
}

.category-nav-item {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	padding: 1.5rem;
	border-radius: var(--radius-md);
	background-color: var(--color-surface-container-lowest);
	border: 1px solid var(--color-outline-variant);
	box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
	transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.category-nav-item:hover {
	border-color: var(--color-primary);
	box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}
.category-nav-item:hover .category-nav-icon {
	transform: scale(1.1);
}

.category-nav-icon {
	font-size: 36px;
	color: var(--color-primary);
	margin-bottom: 0.75rem;
	transition: transform 0.2s ease;
}

.category-nav-label {
	font-size: 14px;
	font-weight: 600;
	letter-spacing: 0.05em;
	text-align: center;
}

/* ---------------------------------------------------------
   FAQ Sections / spacing between categories
   --------------------------------------------------------- */
.faq-sections {
	display: flex;
	flex-direction: column;
	gap: 4rem;
}

.faq-category {
	scroll-margin-top: 6rem;
}

/* ---------------------------------------------------------
   Tabs (shared by FAQ product tabs & Voices product tabs)
   --------------------------------------------------------- */
.tab-buttons {
	display: flex;
	border-bottom: 1px solid var(--color-outline-variant);
	overflow-x: auto;
	margin-bottom: 1.5rem;
}

.tab-button {
	flex-shrink: 0;
	padding: 0.75rem 1rem;
	font-size: 18px;
	background: none;
	border: none;
	border-bottom: 2px solid transparent;
	color: var(--color-on-surface-variant);
	cursor: pointer;
	white-space: nowrap;
	font-family: inherit;
	transition: color 0.2s ease, border-color 0.2s ease;
}
.tab-button:hover {
	color: var(--color-primary);
}
.tab-button.active {
	color: var(--color-primary);
	border-bottom-color: var(--color-primary);
	font-weight: 700;
}

.tab-panel {
	display: none;
}
.tab-panel.active {
	display: block;
}

/* ---------------------------------------------------------
   Accordion (FAQ list)
   --------------------------------------------------------- */
.accordion-list {
	display: flex;
	flex-direction: column;
	gap: 1rem;
}

.accordion-item {
	background-color: var(--color-surface-container-lowest);
	border: 1px solid var(--color-outline-variant);
	border-radius: var(--radius-lg);
	box-shadow: var(--shadow-card);
	overflow: hidden;
}
.accordion-item.active {
	box-shadow: var(--shadow-card-active);
}

.accordion-header {
	width: 100%;
	padding: 1.25rem 1.5rem;
	display: flex;
	justify-content: space-between;
	align-items: center;
	gap: 1rem;
	text-align: left;
	background: none;
	border: none;
	cursor: pointer;
	font-family: inherit;
	font-size: 18px;
	font-weight: 600;
	color: var(--color-on-surface);
	transition: background-color 0.2s ease;
}
.accordion-header:hover {
	background-color: var(--color-surface-container-low);
}

.chevron {
	flex-shrink: 0;
	color: var(--color-outline);
	transition: transform 0.3s ease;
}
.accordion-item.active .chevron {
	transform: rotate(180deg);
}

.accordion-content {
	max-height: 0;
	opacity: 0;
	overflow: hidden;
	padding: 0 1.5rem;
	background-color: var(--color-surface-bright);
	color: var(--color-on-surface-variant);
	transition: max-height 0.3s ease-out, opacity 0.3s ease-out, padding 0.3s ease-out;
}
.accordion-item.active .accordion-content {
	max-height: 1000px;
	opacity: 1;
	padding-top: 1.5rem;
	padding-bottom: 1.5rem;
}

.accordion-content p {
	margin: 0;
}

/* ---------------------------------------------------------
   Contact CTA
   --------------------------------------------------------- */
.contact-cta {
	margin-top: 4rem;
	margin-bottom: 2rem;
	padding: 2rem;
	border-radius: var(--radius-xl);
	background-color: var(--color-primary-container);
	text-align: center;
}

@media (min-width: 768px) {
	.contact-cta {
		padding: 3rem;
	}
}

.contact-cta-title {
	font-size: 24px;
	font-weight: 600;
	color: var(--color-on-primary-container);
	margin: 0 0 1rem;
}

.contact-cta-subtitle {
	font-size: 16px;
	color: var(--color-on-primary-container);
	opacity: 0.9;
	margin: 0 0 2rem;
}

.contact-cta-buttons {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 1rem;
}

@media (min-width: 640px) {
	.contact-cta-buttons {
		flex-direction: row;
	}
}

.btn-line,
.btn-mail {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 100%;
	padding: 1rem 2rem;
	border-radius: var(--radius-full);
	font-size: 14px;
	font-weight: 700;
	letter-spacing: 0.05em;
	transition: opacity 0.2s ease, background-color 0.2s ease;
}

@media (min-width: 640px) {
	.btn-line,
	.btn-mail {
		width: auto;
	}
}

.btn-line {
	background-color: var(--color-line);
	color: #ffffff;
	box-shadow: 0 4px 10px rgba(0, 0, 0, 0.12);
}
.btn-line:hover {
	opacity: 0.9;
}

.icon-line {
	width: 24px;
	height: 24px;
	margin-right: 0.5rem;
	fill: currentColor;
}

.btn-mail {
	background-color: var(--color-surface-container-lowest);
	color: var(--color-primary);
	border: 1px solid var(--color-primary);
	box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}
.btn-mail:hover {
	background-color: var(--color-surface-container-low);
}
.btn-mail .material-symbols-outlined {
	margin-right: 0.5rem;
}

/* ---------------------------------------------------------
   Voices Section
   --------------------------------------------------------- */
.voices-section {
	margin-top: 4rem;
}

.voice-grid {
	display: grid;
	grid-template-columns: 1fr;
	gap: 1.5rem;
}

@media (min-width: 768px) {
	.voice-grid {
		grid-template-columns: repeat(2, 1fr);
	}
}

.voice-card {
	background-color: var(--color-surface-container-lowest);
	border: 1px solid var(--color-outline-variant);
	border-radius: var(--radius-xl);
	box-shadow: var(--shadow-card);
	padding: 1.5rem;
}

.voice-author {
	font-size: 14px;
	font-weight: 600;
	color: var(--color-secondary);
	margin-bottom: 0.5rem;
}

.voice-quote {
	font-size: 18px;
	font-weight: 700;
	color: var(--color-on-surface);
	margin: 0 0 0.75rem;
}

.voice-body {
	font-size: 14px;
	line-height: 1.7;
	color: var(--color-on-surface-variant);
	margin: 0;
}

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
.site-footer {
	width: 100%;
	padding: 3rem var(--gutter);
	margin-top: 4rem;
	background-color: var(--color-surface-container);
	border-top: 1px solid var(--color-outline-variant);
}

.footer-inner {
	max-width: var(--container-max);
	margin: 0 auto;
	display: grid;
	grid-template-columns: 1fr;
	gap: 1rem;
}

@media (min-width: 768px) {
	.footer-inner {
		grid-template-columns: 1fr 1fr;
	}
}

.footer-logo {
	display: block;
	font-size: 24px;
	font-weight: 700;
	color: var(--color-primary);
	margin-bottom: 1rem;
}

.footer-copyright {
	font-size: 16px;
	color: var(--color-on-surface-variant);
	margin: 0;
}

.footer-links,
.footer-nav-menu {
	display: flex;
	flex-direction: column;
	gap: 1rem;
	list-style: none;
	margin: 0;
	padding: 0;
	font-size: 14px;
	font-weight: 600;
	letter-spacing: 0.05em;
	color: var(--color-on-surface-variant);
}

@media (min-width: 768px) {
	.footer-links,
	.footer-nav-menu {
		flex-direction: row;
		justify-content: flex-end;
		gap: 2rem;
	}
}

.footer-links a,
.footer-nav-menu a {
	text-decoration: underline;
	transition: color 0.2s ease;
}
.footer-links a:hover,
.footer-nav-menu a:hover {
	color: var(--color-primary);
}