/* ===== Reset & Variables ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Palette: deep navy + vermilion accent — 地図/行政をイメージ */
  --color-primary:    #1a2744;
  --color-primary-md: #243358;
  --color-accent:     #c0392b;
  --color-accent-lt:  #e74c3c;
  --color-gold:       #b8860b;

  --color-bg:         #f4f5f7;
  --color-surface:    #ffffff;
  --color-surface-2:  #f9fafb;
  --color-border:     #dde1ea;
  --color-border-lt:  #eaedf2;
  --color-text:       #111827;
  --color-text-2:     #374151;
  --color-muted:      #6b7280;
  --color-muted-lt:   #9ca3af;
  --color-code-bg:    #eef0f6;
  --color-hover:      #f0f2f8;
  --color-active-bg:  #e8ecf7;
  --color-active-bd:  #1a2744;

  /* City type colors */
  --color-type-designated: #1a3a5c;
  --color-type-special:    #7c3238;
  --color-type-city:       #1e4d2b;
  --color-type-ward:       #4a3000;
  --color-type-town:       #3d2b6b;
  --color-type-village:    #2d4a3e;

  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;

  --shadow-sm:  0 1px 2px rgba(0,0,0,.05), 0 1px 4px rgba(0,0,0,.04);
  --shadow-md:  0 2px 8px rgba(0,0,0,.07), 0 4px 16px rgba(0,0,0,.05);
  --shadow-lg:  0 8px 24px rgba(0,0,0,.10);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans",
               "Noto Sans JP", "Yu Gothic UI", sans-serif;
  --font-mono: "SF Mono", "Fira Code", Menlo, Consolas, monospace;

  --transition: .15s ease;
}

/* ===== Base ===== */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; }

/* .hidden は utility class として specificity で勝つ必要があるため display:none を直接使う */
[data-hidden="true"],
.hidden { display: none; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap;
}

/* ===== Header ===== */
.site-header {
  background: var(--color-primary);
  color: #fff;
  padding: 0;
  flex-shrink: 0;
  border-bottom: 3px solid var(--color-accent);
}
.header-inner {
  max-width: 1360px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.header-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.header-logo {
  width: 36px;
  height: 36px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}
/* .header-title-wrap — no extra styles needed */
.header-name {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.3px;
  display: block;
  font-family: var(--font-mono);
}
.header-tagline {
  font-size: 11px;
  opacity: .65;
  display: block;
  margin-top: 1px;
}
.header-badge {
  font-size: 10px;
  font-weight: 600;
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 20px;
  padding: 2px 9px;
  letter-spacing: .8px;
  text-transform: uppercase;
  white-space: nowrap;
}
.header-links {
  display: flex;
  align-items: center;
  gap: 8px;
}
/* .header-link は <a> を上書きするため詳細度を上げて !important を避ける */
.site-header .header-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  font-weight: 500;
  color: rgba(255,255,255,.8);
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: var(--radius-sm);
  padding: 5px 12px;
  transition: background var(--transition), color var(--transition);
  text-decoration: none;
}
.site-header .header-link:hover {
  background: rgba(255,255,255,.16);
  color: #fff;
}

/* ===== Layout ===== */
.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 16px;
  flex: 1;
  max-width: 1360px;
  width: 100%;
  margin: 0 auto;
  padding: 20px 24px;
  align-items: start;
}

/* ===== Sidebar ===== */
.sidebar {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  position: sticky;
  top: 20px;
  max-height: calc(100dvh - 100px);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 10px 14px 0;
  flex-shrink: 0;
}
.sidebar-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .8px;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 8px;
}

.search-wrap {
  position: relative;
  padding: 10px 14px 10px;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}
.search-input {
  width: 100%;
  padding: 8px 12px 8px 34px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-surface-2);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(26,39,68,.1);
  background: var(--color-surface);
}
.search-input::placeholder { color: var(--color-muted-lt); }
.search-icon {
  position: absolute;
  left: 24px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  pointer-events: none;
  opacity: .4;
  color: var(--color-text);
}

.pref-count {
  padding: 4px 14px;
  font-size: 11px;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border-lt);
  flex-shrink: 0;
  background: var(--color-surface-2);
}

.pref-list {
  overflow-y: auto;
  flex: 1;
}
.pref-item {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background var(--transition), border-color var(--transition);
  user-select: none;
}
.pref-item:hover { background: var(--color-hover); }
.pref-item.active {
  background: var(--color-active-bg);
  border-left-color: var(--color-active-bd);
}

.pref-code {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--color-muted);
  background: var(--color-code-bg);
  border-radius: 3px;
  padding: 1px 3px;
  text-align: center;
  letter-spacing: .3px;
}
.pref-ja {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
/* Active state override — must come after .pref-ja base rule */
.pref-item.active .pref-ja { color: var(--color-primary); font-weight: 600; }
.pref-en {
  font-size: 10px;
  color: var(--color-muted-lt);
  white-space: nowrap;
}

/* ===== Detail Panel ===== */
.detail-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  min-height: 400px;
  overflow: hidden;
}

.detail-placeholder:not(.hidden) {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  color: var(--color-muted);
  font-size: 14px;
  text-align: center;
  line-height: 2;
  gap: 12px;
  padding: 40px;
}
.placeholder-icon {
  font-size: 48px;
  opacity: .25;
  display: block;
}

/* ===== Pref Detail ===== */
.pref-detail {
  padding: 24px 28px 20px;
  border-bottom: 1px solid var(--color-border);
}
.detail-header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.detail-header-left { flex: 1; min-width: 160px; }
.detail-header h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.5px;
  line-height: 1.2;
  margin-bottom: 8px;
}
.detail-subtitle {
  font-size: 13px;
  color: var(--color-muted);
  font-family: var(--font-mono);
}
.detail-codes {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 16px;
}
.code-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xs);
  padding: 3px 8px;
  font-family: var(--font-mono);
}
.chip-label {
  color: var(--color-muted);
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .4px;
}
.chip-value { color: var(--color-text); font-weight: 500; }

.btn-copy {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text-2);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-copy:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-active-bg);
}
.btn-copy.copied {
  background: #14532d;
  border-color: #14532d;
  color: #fff;
}

/* ===== Language Grid ===== */
.lang-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px;
}
.lang-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-lt);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  transition: border-color var(--transition), box-shadow var(--transition);
  cursor: default;
}
.lang-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(26,39,68,.06);
}
.lang-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .6px;
  color: var(--color-muted);
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.lang-script {
  background: var(--color-code-bg);
  border-radius: 3px;
  padding: 0 4px;
  font-size: 9px;
  text-transform: none;
  letter-spacing: 0;
}
.lang-name {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  word-break: break-all;
  line-height: 1.4;
}
.lang-code {
  font-size: 10px;
  color: var(--color-muted-lt);
  font-family: var(--font-mono);
  margin-top: 2px;
}

/* ===== Cities Section ===== */
.cities-section {
  padding: 0;
}

.cities-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 28px 12px;
  border-bottom: 1px solid var(--color-border-lt);
  flex-wrap: wrap;
}
.cities-toolbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}
.cities-toolbar-left h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
}
.cities-count {
  font-size: 11px;
  color: var(--color-muted);
  background: var(--color-code-bg);
  border-radius: 20px;
  padding: 2px 9px;
  font-weight: 600;
}

/* Cities language tabs */
.city-lang-tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.city-lang-tab {
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 600;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xs);
  background: var(--color-surface);
  color: var(--color-muted);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition), color var(--transition);
  white-space: nowrap;
  user-select: none;
}
.city-lang-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-active-bg);
}
.city-lang-tab.active {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #fff;
}

/* Cities search */
.cities-search-wrap {
  position: relative;
  padding: 10px 28px;
  border-bottom: 1px solid var(--color-border-lt);
}
.cities-search-input {
  width: 100%;
  max-width: 320px;
  padding: 7px 10px 7px 30px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-surface-2);
  transition: border-color var(--transition);
  outline: none;
}
.cities-search-input:focus {
  border-color: var(--color-primary);
  background: var(--color-surface);
}
.cities-search-input::placeholder { color: var(--color-muted-lt); }
.cities-search-icon {
  position: absolute;
  left: calc(28px + 6px);
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  pointer-events: none;
  opacity: .4;
  color: var(--color-text);
}

.cities-container {
  display: flex;
  flex-direction: column;
  padding: 16px 28px 24px;
  gap: 20px;
}

/* City group */
.city-group {
  display: block;
}
.city-group-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
}
.city-type-badge {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .4px;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: var(--radius-xs);
  color: #fff;
  white-space: nowrap;
}
.city-type-badge.designated_city { background: var(--color-type-designated); }
.city-type-badge.special_ward    { background: var(--color-type-special); }
.city-type-badge.city            { background: var(--color-type-city); }
.city-type-badge.ward            { background: var(--color-type-ward); }
.city-type-badge.town            { background: var(--color-type-town); }
.city-type-badge.village         { background: var(--color-type-village); }

.city-group-count {
  font-size: 11px;
  color: var(--color-muted);
  font-weight: 500;
}

.city-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

/* City chip */
.city-chip {
  display: inline-flex;
  flex-direction: column;
  padding: 6px 10px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-lt);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  min-width: 72px;
}
.city-chip:hover {
  border-color: var(--color-primary);
  background: var(--color-active-bg);
  box-shadow: 0 1px 4px rgba(26,39,68,.1);
}
.city-chip.city-chip--parent {
  border-left: 3px solid var(--color-type-designated);
  padding-left: 8px;
}
.city-chip-primary {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.3;
}
.city-chip-secondary {
  font-size: 10px;
  color: var(--color-muted);
  line-height: 1.3;
  margin-top: 1px;
}

/* Sub-ward indented group */
.city-subgroup {
  margin-left: 20px;
  padding-left: 12px;
  border-left: 2px solid var(--color-border);
  margin-top: 8px;
}
.city-subgroup-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .5px;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Empty state */
.cities-empty {
  padding: 24px;
  text-align: center;
  color: var(--color-muted);
  font-size: 13px;
}

/* ===== Footer ===== */
.site-footer {
  text-align: center;
  padding: 16px;
  font-size: 12px;
  color: var(--color-muted);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
  flex-shrink: 0;
  background: var(--color-surface);
}

/* ===== Toast ===== */
.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(12px);
  background: var(--color-primary);
  color: #fff;
  font-size: 12px;
  font-weight: 500;
  padding: 9px 18px;
  border-radius: var(--radius-md);
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s, transform .2s;
  z-index: 1000;
  white-space: nowrap;
  box-shadow: var(--shadow-lg);
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 760px) {
  .layout {
    grid-template-columns: 1fr;
    padding: 12px 14px;
  }
  .sidebar {
    position: static;
    max-height: 260px;
  }
  .header-inner { flex-wrap: wrap; gap: 10px; }
  .header-links { display: none; }
  .pref-detail { padding: 16px 18px 14px; }
  .cities-toolbar { padding: 12px 18px 10px; }
  .cities-search-wrap { padding: 10px 18px; }
  .cities-container { padding: 14px 18px 20px; }
  .lang-grid { grid-template-columns: 1fr 1fr; }
  .detail-header h2 { font-size: 22px; }
}