/* ===========================================
   Site Header — QuantarisLab
   =========================================== */

:root {
	--header-height-pc: 80px;
	--header-height-sp: 64px;
	--header-color-primary: #0a66c2;
	--header-color-text: #333;
	--header-color-text-dark: #111;
	--header-bg: #fff;
	--header-border: rgba(0, 0, 0, 0.08);
}

/* Body offset for fixed header */
body {
	padding-top: var(--header-height-pc);
}

/* -------------------------
   Header base
   ------------------------- */
.site-header {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 1000;
	background-color: var(--header-bg);
	border-bottom: 1px solid var(--header-border);
	transition: box-shadow 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
	-webkit-transform: translateZ(0); /* iOS Safari: fixed要素ちらつき防止 */
	transform: translateZ(0);
}

.site-header.is-scrolled {
	box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.header-inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	max-width: 1200px;
	margin: 0 auto;
	padding: 0 40px;
	height: var(--header-height-pc);
}

/* -------------------------
   Site branding / Logo
   ------------------------- */
.site-branding {
	flex-shrink: 0;
}

.site-branding .custom-logo-link {
	display: block;
}

.site-branding .custom-logo-link img {
	height: 36px;
	width: auto;
	display: block;
	transition: filter 0.3s ease;
}

.site-title-link {
	display: block;
	font-size: 1.2rem;
	font-weight: 700;
	color: var(--header-color-text-dark);
	text-decoration: none;
	letter-spacing: 0.04em;
	transition: color 0.2s ease;
}

.site-title-link:hover {
	color: var(--header-color-primary);
}

/* -------------------------
   PC Navigation
   Override _S theme defaults (style.css sets width:100% and ul display:none)
   ------------------------- */

/* Push nav to the right and reset _S width */
.main-navigation {
	width: auto;
	margin-left: auto;
}

/* Show the menu (overrides display:none in style.css) */
.main-navigation > ul {
	display: flex;
	align-items: center;
	gap: 40px;
	list-style: none;
	margin: 0;
	padding: 0;
}

/* Slide-in from bottom on page load (staggered) */
.main-navigation li {
	opacity: 0;
	transform: translateY(14px);
	animation: navSlideIn 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

@keyframes navSlideIn {
	to {
		opacity: 1;
		transform: translateY(0);
	}
}

.main-navigation li:nth-child(1) { animation-delay: 0.06s; }
.main-navigation li:nth-child(2) { animation-delay: 0.12s; }
.main-navigation li:nth-child(3) { animation-delay: 0.18s; }
.main-navigation li:nth-child(4) { animation-delay: 0.24s; }
.main-navigation li:nth-child(5) { animation-delay: 0.30s; }
.main-navigation li:nth-child(6) { animation-delay: 0.36s; }
.main-navigation li:nth-child(7) { animation-delay: 0.42s; }
.main-navigation li:nth-child(8) { animation-delay: 0.48s; }

.main-navigation a {
	display: inline-flex;
	flex-direction: column;
	align-items: center;
	font-size: 0.875rem;
	font-weight: 500;
	color: var(--header-color-text);
	text-decoration: none;
	letter-spacing: 0.04em;
	padding-bottom: 4px;
	position: relative;
	transition: color 0.2s ease;
}

/* English label */
.main-navigation .nav-item-en {
	display: block;
	font-size: 0.875rem;
	font-weight: 500;
	line-height: 1;
}

/* Japanese subtitle (PC only) */
.main-navigation .nav-item-ja {
	display: block;
	font-size: 0.65rem;
	font-weight: 400;
	color: #999;
	letter-spacing: 0.06em;
	margin-top: 4px;
	line-height: 1;
	transition: color 0.2s ease;
}

.main-navigation a:hover .nav-item-ja {
	color: var(--header-color-primary);
}

.main-navigation .current-menu-item > a .nav-item-ja,
.main-navigation .current-page-ancestor > a .nav-item-ja,
.main-navigation .current_page_item > a .nav-item-ja {
	color: var(--header-color-primary);
}

/* Underline indicator */
.main-navigation a::after {
	content: '';
	position: absolute;
	bottom: 0;
	left: 0;
	width: 100%;
	height: 2px;
	background-color: var(--header-color-primary);
	transform: scaleX(0);
	transform-origin: left center;
	transition: transform 0.25s cubic-bezier(0.22, 1, 0.36, 1);
}

.main-navigation a:hover {
	color: var(--header-color-primary);
}

.main-navigation a:hover::after {
	transform: scaleX(1);
}

/* Active page */
.main-navigation .current-menu-item > a,
.main-navigation .current-page-ancestor > a,
.main-navigation .current_page_item > a {
	color: var(--header-color-primary);
}

.main-navigation .current-menu-item > a::after,
.main-navigation .current-page-ancestor > a::after,
.main-navigation .current_page_item > a::after {
	transform: scaleX(1);
}

/* -------------------------
   Hamburger button (SP only)
   ------------------------- */
.hamburger {
	display: none;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	gap: 5px;
	width: 44px;
	height: 44px;
	padding: 0;
	margin: 0;
	background: none;
	border: none;
	cursor: pointer;
	color: var(--header-color-text);
	flex-shrink: 0;
	transition: color 0.2s ease;
}

.hamburger:hover {
	color: var(--header-color-primary);
}

.hamburger__bar {
	display: block;
	width: 22px;
	height: 2px;
	background-color: currentColor;
	border-radius: 1px;
	transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1),
	            opacity  0.2s ease;
}

/* ☰ → ✕ animation */
.hamburger[aria-expanded="true"] .hamburger__bar:nth-child(1) {
	transform: translateY(7px) rotate(45deg);
}

.hamburger[aria-expanded="true"] .hamburger__bar:nth-child(2) {
	opacity: 0;
	transform: scaleX(0);
}

.hamburger[aria-expanded="true"] .hamburger__bar:nth-child(3) {
	transform: translateY(-7px) rotate(-45deg);
}

/* -------------------------
   Header: dark mode when mobile menu is open
   ------------------------- */
body.menu-is-open .site-header {
	background-color: #111;
	border-bottom-color: rgba(255, 255, 255, 0.08);
	box-shadow: none;
}

body.menu-is-open .site-header .hamburger {
	color: #fff;
}

body.menu-is-open .site-header .hamburger:hover {
	color: rgba(255, 255, 255, 0.6);
}

body.menu-is-open .site-header .site-title-link {
	color: #fff;
}

body.menu-is-open .site-branding .custom-logo-link img {
	filter: brightness(0) invert(1);
}

/* -------------------------
   Mobile menu — dark slide-in from right
   ------------------------- */
.mobile-menu {
	position: fixed;
	top: var(--header-height-sp);
	right: 0;
	bottom: 0;
	left: 0;
	z-index: 999;
	background-color: #111;
	overflow-y: auto;
	-webkit-overflow-scrolling: touch;
	transform: translateX(100%);
	visibility: hidden;
	transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
	            visibility 0s linear 0.4s;
}

.mobile-menu.is-open {
	transform: translateX(0);
	visibility: visible;
	transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
	            visibility 0s linear 0s;
}

/* Navigation list */
.mobile-navigation {
	display: flex;
	flex-direction: column;
	justify-content: flex-start;
	min-height: 100%;
	padding: 32px 0 48px;
}

.mobile-navigation ul {
	list-style: none;
	margin: 0;
	padding: 0;
}

/* List items with staggered slide-in */
.mobile-navigation li {
	border-bottom: 1px solid rgba(255, 255, 255, 0.07);
	transform: translateX(32px);
	opacity: 0;
	transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1),
	            opacity  0.35s ease;
}

.mobile-navigation li:first-child {
	border-top: 1px solid rgba(255, 255, 255, 0.07);
}

.mobile-menu.is-open .mobile-navigation li {
	transform: translateX(0);
	opacity: 1;
}

.mobile-menu.is-open .mobile-navigation li:nth-child(1) { transition-delay: 0.08s; }
.mobile-menu.is-open .mobile-navigation li:nth-child(2) { transition-delay: 0.12s; }
.mobile-menu.is-open .mobile-navigation li:nth-child(3) { transition-delay: 0.16s; }
.mobile-menu.is-open .mobile-navigation li:nth-child(4) { transition-delay: 0.20s; }
.mobile-menu.is-open .mobile-navigation li:nth-child(5) { transition-delay: 0.24s; }
.mobile-menu.is-open .mobile-navigation li:nth-child(6) { transition-delay: 0.28s; }
.mobile-menu.is-open .mobile-navigation li:nth-child(7) { transition-delay: 0.32s; }
.mobile-menu.is-open .mobile-navigation li:nth-child(8) { transition-delay: 0.36s; }

/* Reset delay when closing (prevent items from animating back with delay) */
.mobile-navigation li {
	transition-delay: 0s !important;
}
.mobile-menu.is-open .mobile-navigation li:nth-child(1) { transition-delay: 0.08s !important; }
.mobile-menu.is-open .mobile-navigation li:nth-child(2) { transition-delay: 0.12s !important; }
.mobile-menu.is-open .mobile-navigation li:nth-child(3) { transition-delay: 0.16s !important; }
.mobile-menu.is-open .mobile-navigation li:nth-child(4) { transition-delay: 0.20s !important; }
.mobile-menu.is-open .mobile-navigation li:nth-child(5) { transition-delay: 0.24s !important; }
.mobile-menu.is-open .mobile-navigation li:nth-child(6) { transition-delay: 0.28s !important; }
.mobile-menu.is-open .mobile-navigation li:nth-child(7) { transition-delay: 0.32s !important; }
.mobile-menu.is-open .mobile-navigation li:nth-child(8) { transition-delay: 0.36s !important; }

/* Link */
.mobile-navigation a {
	display: flex;
	flex-direction: column;
	padding: 20px 32px;
	text-decoration: none;
	border-left: 3px solid transparent;
	transition: background 0.2s ease,
	            border-left-color 0.2s ease;
}

.mobile-navigation a:hover {
	background: rgba(255, 255, 255, 0.04);
	border-left-color: var(--color-accent, #2c5f8a);
}

/* English label */
.mobile-navigation .nav-item-en {
	display: block;
	font-size: 1rem;
	font-weight: 600;
	color: #fff;
	letter-spacing: 0.08em;
	line-height: 1;
}

/* Japanese subtitle */
.mobile-navigation .nav-item-ja {
	display: block;
	font-size: 0.7rem;
	color: #777;
	letter-spacing: 0.06em;
	margin-top: 6px;
	line-height: 1;
}

/* Active page */
.mobile-navigation .current-menu-item > a,
.mobile-navigation .current_page_item > a {
	border-left-color: var(--color-accent, #2c5f8a);
}

.mobile-navigation .current-menu-item > a .nav-item-en,
.mobile-navigation .current_page_item > a .nav-item-en {
	color: var(--color-accent, #2c5f8a);
}

/* Prevent body scroll when menu is open */
body.menu-is-open {
	overflow: hidden;
}

/* -------------------------
   Responsive
   ------------------------- */
@media (max-width: 768px) {
	body {
		padding-top: var(--header-height-sp);
	}

	.header-inner {
		padding: 0 20px;
		height: var(--header-height-sp);
		position: relative;
	}

	.main-navigation {
		display: none;
	}

	.hamburger {
		display: flex;
		position: absolute;
		top: 0;
		right: 20px;
		bottom: 0;
		margin-top: auto;
		margin-bottom: auto;
	}
}