/*
 * Site Header / Footer / Mobile Nav — BATCH 027
 * 全 var(--cm-*) は design-tokens.css で定義。リテラル値を直書きしない。
 */

/* ============================================================
   Skip Link
   ============================================================ */
.k-skip-link {
	position: absolute;
	top: -100%;
	left: var(--cm-space-4);
	z-index: 9999;
	background: var(--cm-color-primary);
	color: var(--cm-color-white, #fff);
	padding: var(--cm-space-2) var(--cm-space-4);
	border-radius: var(--cm-radius-sm);
	font-size: var(--cm-font-sm);
	text-decoration: none;
	transition: top .1s;
}
.k-skip-link:focus {
	top: var(--cm-space-2);
}

/* ============================================================
   Site Header
   ============================================================ */
.k-site-header {
	position: sticky;
	top: 0;
	z-index: 100;
	background: var(--cm-color-white, #fff);
	border-bottom: 1px solid var(--cm-color-border-light, #e5e7eb);
	box-shadow: var(--cm-shadow-sm);
}

.k-site-header__inner {
	max-width: var(--cm-max-w-list);
	margin: 0 auto;
	padding: 0 var(--cm-space-4);
	height: 56px;
	display: flex;
	align-items: center;
	gap: var(--cm-space-4);
}

/* ロゴ */
.k-site-logo {
	flex-shrink: 0;
	font-size: var(--cm-font-md);
	font-weight: bold;
	color: var(--cm-color-primary);
	text-decoration: none;
	white-space: nowrap;
}
.k-site-logo:hover {
	opacity: .85;
}

/* ============================================================
   デスクトップナビ
   ============================================================ */
.k-main-nav {
	flex: 1;
	overflow: hidden;
}

.k-main-nav__list {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
	align-items: center;
	gap: var(--cm-space-1);
	flex-wrap: nowrap;
}

.k-main-nav__list a {
	display: block;
	padding: var(--cm-space-2) var(--cm-space-3);
	font-size: var(--cm-font-xs);
	color: inherit;
	text-decoration: none;
	border-radius: var(--cm-radius-sm);
	white-space: nowrap;
	transition: background .15s, color .15s;
}

.k-main-nav__list a:hover,
.k-main-nav__list a:focus-visible {
	background: var(--cm-color-primary-bg, #f0f4ff);
	color: var(--cm-color-primary);
}

.k-main-nav__list a:focus-visible {
	outline: 3px solid var(--cm-color-primary);
	outline-offset: 2px;
}

/* ============================================================
   ハンバーガーボタン
   ============================================================ */
.k-hamburger {
	display: none;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	gap: 5px;
	width: 40px;
	height: 40px;
	flex-shrink: 0;
	background: none;
	border: 1px solid var(--cm-color-border-light, #e5e7eb);
	border-radius: var(--cm-radius-sm);
	cursor: pointer;
	padding: var(--cm-space-2);
	margin-left: auto;
}

.k-hamburger__bar {
	display: block;
	width: 20px;
	height: 2px;
	background: currentColor;
	border-radius: 2px;
	transition: transform .2s, opacity .2s;
}

.k-hamburger[aria-expanded="true"] .k-hamburger__bar:nth-child(1) {
	transform: translateY(7px) rotate(45deg);
}
.k-hamburger[aria-expanded="true"] .k-hamburger__bar:nth-child(2) {
	opacity: 0;
}
.k-hamburger[aria-expanded="true"] .k-hamburger__bar:nth-child(3) {
	transform: translateY(-7px) rotate(-45deg);
}

.k-hamburger:focus-visible {
	outline: 3px solid var(--cm-color-primary);
	outline-offset: 2px;
}

/* ============================================================
   モバイルナビドロワー
   ============================================================ */
.k-mobile-nav {
	position: fixed;
	top: 0;
	right: 0;
	bottom: 0;
	width: min(80vw, 320px);
	z-index: 200;
	background: var(--cm-color-white, #fff);
	box-shadow: var(--cm-shadow-md);
	padding: var(--cm-space-8) var(--cm-space-6);
	overflow-y: auto;
	overscroll-behavior: contain;
	transform: translateX(100%);
	transition: transform .25s ease;
	visibility: hidden;
}

.k-mobile-nav.is-open {
	transform: translateX(0);
	visibility: visible;
}

.k-mobile-nav__close {
	display: block;
	margin-left: auto;
	margin-bottom: var(--cm-space-6);
	background: none;
	border: 1px solid var(--cm-color-border-light, #e5e7eb);
	border-radius: var(--cm-radius-sm);
	width: 36px;
	height: 36px;
	font-size: var(--cm-font-md);
	cursor: pointer;
	line-height: 1;
}

.k-mobile-nav__close:focus-visible {
	outline: 3px solid var(--cm-color-primary);
	outline-offset: 2px;
}

.k-mobile-nav__list {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
	flex-direction: column;
	gap: var(--cm-space-1);
}

.k-mobile-nav__list a {
	display: block;
	padding: var(--cm-space-3) var(--cm-space-4);
	font-size: var(--cm-font-base);
	color: inherit;
	text-decoration: none;
	border-radius: var(--cm-radius-sm);
	border-bottom: 1px solid var(--cm-color-border-light, #e5e7eb);
}

.k-mobile-nav__list a:hover,
.k-mobile-nav__list a:focus-visible {
	background: var(--cm-color-primary-bg, #f0f4ff);
	color: var(--cm-color-primary);
}

.k-mobile-nav__list a:focus-visible {
	outline: 3px solid var(--cm-color-primary);
	outline-offset: 2px;
}

/* オーバーレイ */
.k-mobile-nav__overlay {
	display: none;
	position: fixed;
	inset: 0;
	z-index: 199;
	background: rgba(0, 0, 0, .4);
}

.k-mobile-nav__overlay.is-visible {
	display: block;
}

/* JS 無効時: ドロワーを常時表示（ハンバーガーも非表示） */
.no-js .k-hamburger {
	display: none !important;
}
.no-js .k-mobile-nav {
	position: static;
	transform: none;
	visibility: visible;
	width: 100%;
	box-shadow: none;
	border-top: 1px solid var(--cm-color-border-light, #e5e7eb);
	padding: var(--cm-space-4);
}
.no-js .k-mobile-nav__close {
	display: none;
}

/* ============================================================
   Site Footer
   ============================================================ */
.k-site-footer {
	background: var(--cm-color-bg-light, #f9fafb);
	border-top: 1px solid var(--cm-color-border-light, #e5e7eb);
	margin-top: var(--cm-space-10);
}

.k-site-footer__inner {
	max-width: var(--cm-max-w-list);
	margin: 0 auto;
	padding: var(--cm-space-8) var(--cm-space-4) var(--cm-space-6);
	display: grid;
	grid-template-columns: 1fr auto;
	gap: var(--cm-space-6);
	align-items: start;
}

.k-site-footer__brand {
	grid-column: 1 / -1;
}

.k-site-footer__name {
	font-size: var(--cm-font-md);
	font-weight: bold;
	color: var(--cm-color-primary);
	text-decoration: none;
}

.k-site-footer__tagline {
	font-size: var(--cm-font-xs);
	color: var(--cm-color-text-muted, #6b7280);
	margin-top: var(--cm-space-1);
}

.k-site-footer__nav ul {
	list-style: none;
	margin: 0;
	padding: 0;
	display: flex;
	flex-wrap: wrap;
	gap: var(--cm-space-2) var(--cm-space-4);
}

.k-site-footer__nav a {
	font-size: var(--cm-font-sm);
	color: var(--cm-color-text-muted, #6b7280);
	text-decoration: none;
}

.k-site-footer__nav a:hover,
.k-site-footer__nav a:focus-visible {
	color: var(--cm-color-primary);
	text-decoration: underline;
}

.k-site-footer__copy {
	grid-column: 1 / -1;
	font-size: var(--cm-font-2xs);
	color: var(--cm-color-text-muted, #6b7280);
	margin: 0;
}

/* ============================================================
   レスポンシブ
   ============================================================ */
@media (max-width: 700px) {
	.k-main-nav {
		display: none;
	}

	.k-hamburger {
		display: flex;
	}

	.k-site-footer__inner {
		grid-template-columns: 1fr;
	}
}

@media (max-width: 400px) {
	.k-site-header__inner {
		padding: 0 var(--cm-space-3);
	}

	.k-site-footer__inner {
		padding: var(--cm-space-6) var(--cm-space-3) var(--cm-space-4);
	}
}