/**
 * Header Styles
 * Editorial Navigation - Desktop & Mobile
 * Mobile-first responsive design
 */

/* =========================
   CSS Variables
   ========================= */
:root {
  --header-height: 64px;
  --header-height-desktop: 80px;
  --header-bg: rgba(255, 255, 255, 0.98);
  --header-bg-scrolled: rgba(255, 255, 255, 0.95);
  --mobile-menu-width: min(320px, 85vw);
  --mobile-menu-bg: var(--bg-main);
  --overlay-bg: rgba(13, 31, 23, 0.5);
  --dropdown-shadow: 0 8px 32px rgba(13, 31, 23, 0.12);
  --menu-transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* =========================
   Header Shell
   ========================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header, 300);
  height: var(--header-height);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--transition-base),
              box-shadow var(--transition-base),
              height var(--transition-base);
}

.site-header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--border-soft, rgba(0, 0, 0, 0.08));
  opacity: 0;
  transition: opacity var(--transition-base);
}

.site-header.is-scrolled {
  background: var(--header-bg-scrolled);
  box-shadow: 0 1px 3px rgba(13, 31, 23, 0.06);
}

.site-header.is-scrolled::after {
  opacity: 1;
}

/* Header spacer for fixed positioning */
.header-spacer {
  height: var(--header-height);
}

/* Header inner container */
.header__inner {
  max-width: var(--container-width, 1440px);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--space-md, 1rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg, 2rem);
}

/* =========================
   Logo
   ========================= */
.header__logo {
  flex-shrink: 0;
  z-index: 10;
}

.header__logo a {
  display: flex;
  align-items: center;
  font-family: var(--font-family-heading, serif);
  font-size: var(--font-size-lg, 1.25rem);
  font-weight: var(--font-weight-semibold, 600);
  letter-spacing: -0.02em;
  color: var(--text-main, #1a1f1c);
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s);
}

.header__logo a:hover {
  color: var(--accent-main, #234e38);
}

/* =========================
   Mobile Menu Toggle
   ========================= */
.header__menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: calc(var(--z-header, 300) + 10);
  -webkit-tap-highlight-color: transparent;
}

.header__menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-main, #1a1f1c);
  border-radius: 1px;
  transition: all var(--menu-transition);
}

.header__menu-toggle span:nth-child(1) {
  transform: translateY(-6px);
}

.header__menu-toggle span:nth-child(3) {
  transform: translateY(6px);
}

/* Toggle animation - X shape when open */
body.nav-open .header__menu-toggle span:nth-child(1) {
  transform: translateY(0) rotate(45deg);
}

body.nav-open .header__menu-toggle span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

body.nav-open .header__menu-toggle span:nth-child(3) {
  transform: translateY(0) rotate(-45deg);
}

/* =========================
   Mobile Overlay
   ========================= */
.mobile-overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay-bg);
  opacity: 0;
  visibility: hidden;
  z-index: calc(var(--z-header, 300) - 1);
  transition: opacity var(--menu-transition),
              visibility var(--menu-transition);
  -webkit-tap-highlight-color: transparent;
}

body.nav-open .mobile-overlay {
  opacity: 1;
  visibility: visible;
}

/* Body scroll lock when menu is open */
body.nav-open {
  overflow: hidden;
  position: fixed;
  width: 100%;
}

/* =========================
   Mobile Navigation
   ========================= */
.header__nav {
  position: fixed;
  top: 0;
  right: 0;
  width: var(--mobile-menu-width);
  height: 100vh;
  height: 100dvh;
  background: var(--mobile-menu-bg);
  padding: calc(var(--header-height) + var(--space-lg, 2rem)) var(--space-lg, 2rem) var(--space-xl, 3rem);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--menu-transition);
  z-index: var(--z-header, 300);
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

body.nav-open .header__nav {
  transform: translateX(0);
}

/* =========================
   Menu List (Mobile)
   ========================= */
.mega-menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.mega-menu__item {
  border-bottom: 1px solid var(--border-soft, rgba(0, 0, 0, 0.08));
}

.mega-menu__item:last-child {
  border-bottom: none;
}

/* Parent link */
.mega-menu__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-md, 1.5rem) 0;
  font-family: var(--font-family-body, sans-serif);
  font-size: var(--font-size-lg, 1.25rem);
  font-weight: var(--font-weight-medium, 500);
  color: var(--text-main, #1a1f1c);
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s);
  -webkit-tap-highlight-color: transparent;
}

.mega-menu__link:hover,
.mega-menu__link:active {
  color: var(--accent-main, #234e38);
}

/* Arrow icon */
.mega-menu__link svg {
  width: 16px;
  height: 16px;
  opacity: 0.5;
  transition: transform var(--menu-transition),
              opacity var(--transition-fast, 0.2s);
  flex-shrink: 0;
}

.mega-menu__item.is-active .mega-menu__link svg {
  transform: rotate(180deg);
  opacity: 1;
}

/* =========================
   Mobile Dropdown (Accordion)
   ========================= */
.mega-menu__dropdown {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--menu-transition);
}

.mega-menu__item.is-active .mega-menu__dropdown {
  grid-template-rows: 1fr;
}

.mega-menu__dropdown-inner {
  overflow: hidden;
}

/* Hide mega menu elements on mobile */
.mega-menu__image,
.mega-menu__image-wrap,
.mega-menu__view-all,
.mega-menu__sub-title {
  display: none;
}

.mega-menu__sub-wrap {
  display: contents;
}

/* Sub menu list */
.mega-menu__sub {
  list-style: none;
  margin: 0;
  padding: 0 0 var(--space-md, 1.5rem) var(--space-sm, 1rem);
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs, 0.25rem);
}

.mega-menu__sub-item {
  margin: 0;
}

.mega-menu__sub-link {
  display: flex;
  align-items: center;
  padding: var(--space-sm, 1rem) var(--space-md, 1.5rem);
  font-size: var(--font-size-base, 1rem);
  font-weight: var(--font-weight-normal, 400);
  color: var(--text-sub, #5a655f);
  text-decoration: none;
  border-radius: var(--radius-md, 8px);
  transition: all var(--transition-fast, 0.2s);
  -webkit-tap-highlight-color: transparent;
}

.mega-menu__sub-link:hover,
.mega-menu__sub-link:active {
  color: var(--text-main, #1a1f1c);
  background: var(--bg-soft, #f2f4f3);
}

/* =========================
   DESKTOP STYLES (769px+)
   ========================= */
@media (min-width: 769px) {
  :root {
    --header-height: var(--header-height-desktop);
  }

  .header__inner {
    padding: 0 var(--space-lg, 2rem);
  }

  .header__logo a {
    font-size: var(--font-size-xl, 1.5rem);
  }

  /* Hide mobile toggle */
  .header__menu-toggle {
    display: none;
  }

  /* Hide overlay on desktop */
  .mobile-overlay {
    display: none;
  }

  /* Desktop navigation - 中央配置 */
  .header__nav {
    position: static;
    width: auto;
    height: auto;
    padding: 0;
    background: transparent;
    transform: none;
    overflow: visible;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    flex: 1;
  }

  /* Reset body styles */
  body.nav-open {
    overflow: auto;
    position: static;
  }

  /* Horizontal menu */
  .mega-menu {
    flex-direction: row;
    align-items: center;
    gap: var(--space-xl, 3rem);
  }

  .mega-menu__item {
    position: relative;
    border-bottom: none;
  }

  /* Desktop link */
  .mega-menu__link {
    padding: var(--space-sm, 1rem) 0;
    font-size: var(--font-size-sm, 0.875rem);
    font-weight: var(--font-weight-medium, 500);
    letter-spacing: 0.02em;
    gap: var(--space-2xs, 0.25rem);
    justify-content: flex-start;
  }

  /* Underline animation */
  .mega-menu__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-main, #234e38);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .mega-menu__item:hover .mega-menu__link::after,
  .mega-menu__item.is-hover-active .mega-menu__link::after {
    transform: scaleX(1);
  }

  /* Arrow icon */
  .mega-menu__link svg {
    width: 12px;
    height: 12px;
  }

  .mega-menu__item:hover .mega-menu__link svg,
  .mega-menu__item.is-hover-active .mega-menu__link svg {
    transform: rotate(180deg);
    opacity: 1;
  }

  /* =========================================
     Desktop Mega Menu Dropdown
     ========================================= */
  .mega-menu__dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%) translateY(-12px);
    display: block;
    width: 520px;
    padding: var(--space-xl, 3rem);
    background: var(--bg-main, #ffffff);
    border: 1px solid var(--border-soft, rgba(0, 0, 0, 0.06));
    border-radius: var(--radius-xl, 16px);
    box-shadow:
      0 4px 6px rgba(13, 31, 23, 0.02),
      0 12px 24px rgba(13, 31, 23, 0.08),
      0 24px 48px rgba(13, 31, 23, 0.08);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease,
                visibility 0.3s ease,
                transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: var(--z-dropdown, 100);
  }

  /* 中央からずれないよう調整 - 左端・右端対応 */
  .mega-menu__item:first-child .mega-menu__dropdown {
    left: 0;
    transform: translateX(0) translateY(-12px);
  }

  .mega-menu__item:last-child .mega-menu__dropdown {
    left: auto;
    right: 0;
    transform: translateX(0) translateY(-12px);
  }

  .mega-menu__item.has-children:hover .mega-menu__dropdown,
  .mega-menu__item.has-children.is-hover-active .mega-menu__dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
  }

  .mega-menu__item:first-child.has-children:hover .mega-menu__dropdown,
  .mega-menu__item:first-child.has-children.is-hover-active .mega-menu__dropdown {
    transform: translateX(0) translateY(0);
  }

  .mega-menu__item:last-child.has-children:hover .mega-menu__dropdown,
  .mega-menu__item:last-child.has-children.is-hover-active .mega-menu__dropdown {
    transform: translateX(0) translateY(0);
  }

  /* Hover bridge */
  .mega-menu__item.has-children::before {
    content: '';
    position: absolute;
    top: 100%;
    left: -24px;
    right: -24px;
    height: 16px;
    background: transparent;
  }

  /* Dropdown inner - 2カラムレイアウト */
  .mega-menu__dropdown-inner {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-xl, 3rem);
    overflow: visible;
  }

  /* 画像ラッパー */
  .mega-menu__image-wrap {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm, 1rem);
  }

  /* カテゴリ画像 */
  .mega-menu__image {
    display: block;
    border-radius: var(--radius-lg, 12px);
    overflow: hidden;
    aspect-ratio: 4 / 3;
    background: linear-gradient(135deg, var(--forest-600, #234e38) 0%, var(--forest-800, #132b1e) 100%);
  }

  .mega-menu__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .mega-menu__item:hover .mega-menu__image img {
    transform: scale(1.05);
  }

  /* プレースホルダー画像 */
  .mega-menu__image--placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .mega-menu__image--placeholder span {
    font-family: var(--font-family-heading, serif);
    font-size: 3rem;
    font-weight: var(--font-weight-bold, 700);
    color: rgba(255, 255, 255, 0.3);
    text-transform: uppercase;
  }

  /* すべて見るリンク */
  .mega-menu__view-all {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs, 0.5rem);
    font-size: var(--font-size-xs, 0.75rem);
    font-weight: var(--font-weight-medium, 500);
    color: var(--accent-main, #234e38);
    text-decoration: none;
    transition: gap 0.2s ease;
  }

  .mega-menu__view-all:hover {
    gap: var(--space-sm, 1rem);
  }

  .mega-menu__view-all svg {
    transition: transform 0.2s ease;
  }

  .mega-menu__view-all:hover svg {
    transform: translateX(2px);
  }

  /* サブメニューラッパー */
  .mega-menu__sub-wrap {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm, 1rem);
  }

  /* サブメニュータイトル */
  .mega-menu__sub-title {
    font-size: var(--font-size-xs, 0.75rem);
    font-weight: var(--font-weight-semibold, 600);
    color: var(--text-muted, #7a857f);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding-left: var(--space-md, 1.5rem);
  }

  /* Sub menu */
  .mega-menu__sub {
    padding: 0;
    gap: var(--space-2xs, 0.25rem);
    justify-content: flex-start;
  }

  .mega-menu__sub-item {
    margin: 0;
  }

  .mega-menu__sub-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm, 1rem);
    padding: var(--space-sm, 1rem) var(--space-md, 1.5rem);
    font-size: var(--font-size-base, 1rem);
    font-weight: var(--font-weight-medium, 500);
    color: var(--text-sub, #5a655f);
    border-radius: var(--radius-md, 8px);
    transition: all 0.2s ease;
    position: relative;
  }

  .mega-menu__sub-link:hover {
    color: var(--text-main, #1a1f1c);
    background: var(--bg-soft, #f5f5f5);
    padding-left: calc(var(--space-md, 1.5rem) + 4px);
  }

  /* 左のアクセントライン */
  .mega-menu__sub-link::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--accent-main, #234e38);
    border-radius: 2px;
    transition: height 0.2s ease;
  }

  .mega-menu__sub-link:hover::before {
    height: 20px;
  }

  /* 矢印は削除 */
  .mega-menu__sub-link::after {
    display: none;
  }
}

/* =========================
   Large Desktop (1200px+)
   ========================= */
@media (min-width: 1200px) {
  .mega-menu {
    gap: var(--space-xxl, 4.5rem);
  }
}

/* =========================
   Accessibility
   ========================= */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-md, 1rem);
  padding: var(--space-sm, 1rem) var(--space-md, 1.5rem);
  background: var(--accent-main, #234e38);
  color: var(--text-invert, #ffffff);
  font-weight: var(--font-weight-medium, 500);
  border-radius: var(--radius-md, 8px);
  z-index: calc(var(--z-header, 300) + 100);
  transition: top var(--transition-fast, 0.2s);
}

.skip-link:focus {
  top: var(--space-md, 1rem);
}

/* Focus styles */
.mega-menu__link:focus-visible,
.mega-menu__sub-link:focus-visible {
  outline: 2px solid var(--accent-main, #234e38);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}