.site-header {
	position: sticky;
	top: 0;
	z-index: 500;
	isolation: isolate;
}

.site-header::before {
	content: '';
	position: absolute;
	inset: 0;
	z-index: -1;
	background-color: var(--color-bg);
	transition: background-color var(--duration-base) var(--ease-smooth), box-shadow var(--duration-base);
}

.site-header.scrolled::before {
	background-color: rgba(255, 255, 255, 0.85);
	backdrop-filter: blur(10px);
	-webkit-backdrop-filter: blur(10px);
	box-shadow: var(--shadow-sm);
}

.header-inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	width: 100%;
	padding-block: var(--space-sm);
}

.logo {
	display: inline-flex;
	flex-direction: column;
	align-items: flex-start;
	gap: 3px;
	color: #b85757;
	font-family: var(--font-logo);
	font-size: var(--fs-lg);
	font-weight: var(--fw-medium);
	letter-spacing: 0.5px;
	flex-shrink: 0;
	line-height: 1;
	text-decoration: none;
}

.logo-line {
	display: inline-flex;
	align-items: baseline;
	gap: 4px;
}

.logo-en {
	font-family: var(--font-logo);
	font-weight: var(--fw-medium);
	letter-spacing: 0.04em;
	color: #b85757;
}

.logo-accent { color: #b85757; }

.logo-subtitle {
	display: block;
	font-size: 0.48rem;
	font-weight: 400;
	letter-spacing: 0.22em;
	color: rgba(20, 20, 20, 0.6);
	text-transform: uppercase;
	line-height: 1.2;
	font-family: var(--font-logo);
}

.main-nav { margin-inline-start: auto; }

.main-nav ul { display: flex; align-items: center; gap: var(--space-lg); }

.main-nav a { position: relative; color: var(--color-text); font-weight: var(--fw-medium); }

.main-nav a::after {
	content: '';
	position: absolute;
	right: 0;
	bottom: -6px;
	width: 0;
	height: 2px;
	background-color: var(--color-gold);
	transition: width var(--duration-fast) var(--ease-smooth);
}

.main-nav a:hover::after,
.main-nav a:focus-visible::after { width: 100%; }

.menu-toggle {
	display: none;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 5px;
	width: 44px;
	height: 44px;
	position: relative;
	background: none;
	border: none;
	cursor: pointer;
}

.menu-toggle span {
	display: block;
	width: 24px;
	height: 2px;
	background-color: var(--color-black);
	border-radius: var(--radius-full);
	transition: transform 0.4s var(--ease-spring), opacity 0.3s var(--ease-smooth);
}

.menu-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }