/* ==========================================================================
   Ikumi Header — Custom Glassmorphic Header
   ========================================================================== */

/* --- Design Tokens --- */
:root {
	--ih-primary: #A85E6D;
	--ih-primary-dark: #8A4A58;
	--ih-primary-hover: #6B3543;
	--ih-accent: #E8B4B4;
	--ih-surface: #FFFCFC;
	--ih-subtle: #F9F2F4;
	--ih-text-body: #594A4E;
	--ih-text-light: #77696D;
	--ih-focus-ring: 0 0 0 3px rgba(168, 94, 109, 0.4);
	--ih-header-height: 80px;
	--ih-font-display: "Shippori Mincho", serif;
	--ih-font-body: "LINE Seed JP", sans-serif;
}

/* --- Hide Arkhe Default Header --- */
.l-header,
.c-header {
	display: none !important;
}

/* --- Buttons with colored backgrounds — keep text light on hover --- */
a.bg-primary:hover,
a.bg-primaryDark:hover,
.ikumi-header__nav-cta:hover,
.ikumi-header__mobile-cta:hover {
	color: #fff;
}

/* --- Body Offset for Fixed Header --- */
body {
	padding-top: var(--ih-header-height);
}

/* ==========================================================================
   Header
   ========================================================================== */
.ikumi-header {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	z-index: 1000;
	height: var(--ih-header-height);
	background: rgba(255, 255, 255, 0.95);
	-webkit-backdrop-filter: blur(16px);
	backdrop-filter: blur(16px);
	border-bottom: 1px solid rgba(168, 94, 109, 0.1);
	box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
	transition: box-shadow 0.3s ease;
}

.ikumi-header__inner {
	display: flex;
	justify-content: space-between;
	align-items: center;
	max-width: 1280px;
	height: 100%;
	margin: 0 auto;
	padding: 0 1rem;
}

@media (min-width: 1024px) {
	.ikumi-header__inner {
		padding: 0 2rem;
	}
}

/* ==========================================================================
   Logo
   ========================================================================== */
.ikumi-header__logo {
	display: flex;
	align-items: center;
	gap: 0.75rem;
	text-decoration: none;
	color: inherit;
}

.ikumi-header__logo:hover {
	color: inherit;
}

.ikumi-header__logo:focus-visible {
	outline: none;
	box-shadow: var(--ih-focus-ring);
	border-radius: 4px;
}

.ikumi-header__logo-badge {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 40px;
	height: 40px;
	background: var(--ih-primary);
	color: #fff;
	border-radius: 50%;
	font-family: var(--ih-font-display);
	font-weight: 700;
	font-size: 1.25rem;
	line-height: 1;
	transition: background-color 0.3s ease;
	flex-shrink: 0;
}

.ikumi-header__logo:hover .ikumi-header__logo-badge {
	background: var(--ih-primary-dark);
}

.ikumi-header__logo-info {
	display: flex;
	flex-direction: column;
}

.ikumi-header__logo-text {
	font-family: var(--ih-font-display);
	font-size: 1.25rem;
	font-weight: 700;
	color: var(--ih-primary);
	letter-spacing: 0.15em;
	line-height: 1;
}

.ikumi-header__logo-suffix {
	font-size: 0.625rem;
	font-weight: 400;
	margin-left: 0.25rem;
	opacity: 0.7;
}

.ikumi-header__logo-sub {
	font-family: var(--ih-font-body);
	font-size: 0.625rem;
	color: var(--ih-text-light);
	letter-spacing: 0.08em;
	margin-top: 0.25rem;
	line-height: 1;
}

/* ==========================================================================
   Desktop Navigation
   ========================================================================== */
.ikumi-header__nav {
	display: none;
	align-items: center;
	gap: 2rem;
}

@media (min-width: 768px) {
	.ikumi-header__nav {
		display: flex;
	}
}

.ikumi-header__nav-link {
	position: relative;
	font-family: var(--ih-font-body);
	font-size: 0.6875rem;
	font-weight: 700;
	color: rgba(89, 74, 78, 0.7);
	letter-spacing: 0.15em;
	text-transform: uppercase;
	text-decoration: none;
	padding: 0.5rem 0;
	transition: color 0.3s ease;
}

.ikumi-header__nav-link::after {
	content: "";
	position: absolute;
	bottom: 0;
	left: 0;
	right: 0;
	height: 2px;
	background: var(--ih-primary);
	transform: scaleX(0);
	transform-origin: center;
	transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.ikumi-header__nav-link:hover {
	color: var(--ih-text-body);
}

.ikumi-header__nav-link:hover::after {
	transform: scaleX(1);
}

.ikumi-header__nav-link:focus-visible {
	outline: none;
	box-shadow: var(--ih-focus-ring);
	border-radius: 2px;
}

.ikumi-header__nav-cta {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	padding: 0.625rem 1.5rem;
	background: var(--ih-primary-dark);
	color: #fff;
	font-family: var(--ih-font-body);
	font-size: 0.6875rem;
	font-weight: 700;
	letter-spacing: 0.15em;
	text-transform: uppercase;
	text-decoration: none;
	border-radius: 2px;
	box-shadow: 0 4px 6px rgba(107, 53, 67, 0.2);
	transition: background-color 0.3s ease, box-shadow 0.3s ease, transform 0.2s ease;
}

.ikumi-header__nav-cta:hover {
	background: var(--ih-primary-hover);
	color: #fff;
	box-shadow: 0 6px 14px rgba(107, 53, 67, 0.35);
	transform: translateY(-2px);
}

.ikumi-header__nav-cta:focus-visible {
	outline: none;
	box-shadow: var(--ih-focus-ring), 0 4px 6px rgba(107, 53, 67, 0.2);
}

/* ==========================================================================
   Hamburger Button (Mobile)
   ========================================================================== */
.ikumi-header__hamburger {
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	gap: 5px;
	width: 44px;
	height: 44px;
	padding: 0;
	background: none;
	border: none;
	cursor: pointer;
	-webkit-tap-highlight-color: transparent;
}

.ikumi-header__hamburger:focus-visible {
	outline: none;
	box-shadow: var(--ih-focus-ring);
	border-radius: 4px;
}

@media (min-width: 768px) {
	.ikumi-header__hamburger {
		display: none;
	}
}

.ikumi-header__hamburger-line {
	display: block;
	width: 22px;
	height: 2px;
	background: var(--ih-primary);
	border-radius: 1px;
	transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Hamburger → X animation */
.ikumi-header__hamburger[aria-expanded="true"] .ikumi-header__hamburger-line:nth-child(1) {
	transform: translateY(7px) rotate(45deg);
}

.ikumi-header__hamburger[aria-expanded="true"] .ikumi-header__hamburger-line:nth-child(2) {
	opacity: 0;
}

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

/* ==========================================================================
   Mobile Menu
   ========================================================================== */
.ikumi-header__mobile-menu {
	position: fixed;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	z-index: 999;
	pointer-events: none;
}

.ikumi-header__mobile-menu[aria-hidden="false"] {
	pointer-events: auto;
}

.ikumi-header__mobile-overlay {
	position: absolute;
	inset: 0;
	background: rgba(89, 74, 78, 0.4);
	opacity: 0;
	transition: opacity 0.3s ease;
}

.ikumi-header__mobile-menu[aria-hidden="false"] .ikumi-header__mobile-overlay {
	opacity: 1;
}

.ikumi-header__mobile-panel {
	position: absolute;
	top: 0;
	right: 0;
	width: 80%;
	max-width: 360px;
	height: 100%;
	background: var(--ih-surface);
	display: flex;
	flex-direction: column;
	justify-content: center;
	padding: 2rem;
	transform: translateX(100%);
	transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
	box-shadow: -4px 0 24px rgba(0, 0, 0, 0.1);
}

.ikumi-header__mobile-menu[aria-hidden="false"] .ikumi-header__mobile-panel {
	transform: translateX(0);
}

.ikumi-header__mobile-nav {
	display: flex;
	flex-direction: column;
	gap: 0;
}

.ikumi-header__mobile-link {
	display: block;
	font-family: var(--ih-font-body);
	font-size: 0.8125rem;
	font-weight: 700;
	color: var(--ih-text-body);
	letter-spacing: 0.2em;
	text-transform: uppercase;
	text-decoration: none;
	padding: 1rem 0;
	border-bottom: 1px solid rgba(168, 94, 109, 0.1);
	transition: color 0.3s ease, padding-left 0.3s ease;
}

.ikumi-header__mobile-link:hover {
	color: var(--ih-primary-dark);
	padding-left: 0.5rem;
}

.ikumi-header__mobile-link:focus-visible {
	outline: none;
	box-shadow: var(--ih-focus-ring);
	border-radius: 2px;
}

.ikumi-header__mobile-cta {
	display: block;
	text-align: center;
	margin-top: 2rem;
	padding: 1rem 2rem;
	background: var(--ih-primary-dark);
	color: #fff;
	font-family: var(--ih-font-body);
	font-size: 0.8125rem;
	font-weight: 700;
	letter-spacing: 0.15em;
	text-transform: uppercase;
	text-decoration: none;
	border-radius: 2px;
	box-shadow: 0 4px 6px rgba(107, 53, 67, 0.2);
	transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.ikumi-header__mobile-cta:hover {
	background: var(--ih-primary-hover);
	color: #fff;
	box-shadow: 0 6px 14px rgba(107, 53, 67, 0.35);
}

.ikumi-header__mobile-cta:focus-visible {
	outline: none;
	box-shadow: var(--ih-focus-ring), 0 4px 6px rgba(107, 53, 67, 0.2);
}

.ikumi-header__mobile-brand {
	margin-top: auto;
	padding-top: 2rem;
	text-align: center;
}

.ikumi-header__mobile-brand-name {
	display: block;
	font-family: var(--ih-font-display);
	font-size: 0.875rem;
	font-weight: 700;
	color: var(--ih-primary);
	letter-spacing: 0.15em;
}

.ikumi-header__mobile-brand-sub {
	display: block;
	font-family: var(--ih-font-body);
	font-size: 0.625rem;
	color: var(--ih-text-light);
	margin-top: 0.25rem;
}

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