/* ========================================
   CSS Custom Properties
   ======================================== */
:root {
  /* ベースカラー */
  --color-bg: #FAF8F5;
  --color-bg-secondary: #F2EFEA;
  --color-surface: #FFFFFF;
  --color-text-primary: #2D2D2D;
  --color-text-secondary: #6B6B6B;
  --color-border: #D4D0CB;
  --color-hover: #EDE8F5;

  /* 時代別カラー */
  --color-reiwa: #8B4C70;
  --color-heisei: #2B6CB0;
  --color-showa: #5A8C3C;
  --color-taisho: #B85C38;
  --color-meiji: #46295A;

  /* 時代別背景（テーブル行用） */
  --color-reiwa-bg: rgba(139, 76, 112, 0.06);
  --color-heisei-bg: rgba(43, 108, 176, 0.06);
  --color-showa-bg: rgba(90, 140, 60, 0.06);
  --color-taisho-bg: rgba(184, 92, 56, 0.06);
  --color-meiji-bg: rgba(70, 41, 90, 0.06);

  /* 特殊ハイライト */
  --color-current-year: #FFF3CD;
  --color-current-year-accent: #F59E0B;
  --color-search-focus: rgba(139, 76, 112, 0.15);

  /* フォント */
  --font-main: "Noto Sans JP", "Hiragino Sans", "Meiryo", sans-serif;
  --font-number: "Inter", "Noto Sans JP", sans-serif;

  /* サイズ */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;

  /* トランジション */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  /* レイアウト */
  --max-width: 960px;
  --header-height: 80px;
}

/* ========================================
   ダークモード
   ======================================== */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1A1A1A;
    --color-bg-secondary: #242424;
    --color-surface: #2A2A2A;
    --color-text-primary: #E8E6E3;
    --color-text-secondary: #A0A0A0;
    --color-border: #3D3D3D;
    --color-hover: #2A2540;
    --color-current-year: #3D3520;
    --color-current-year-accent: #F59E0B;

    --color-reiwa: #B06A94;
    --color-heisei: #4A90D9;
    --color-showa: #7AB356;
    --color-taisho: #D4784E;
    --color-meiji: #7A5A9A;

    --color-reiwa-bg: rgba(176, 106, 148, 0.1);
    --color-heisei-bg: rgba(74, 144, 217, 0.1);
    --color-showa-bg: rgba(122, 179, 86, 0.1);
    --color-taisho-bg: rgba(212, 120, 78, 0.1);
    --color-meiji-bg: rgba(122, 90, 154, 0.1);
  }
}

/* ========================================
   リセット & ベース
   ======================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-main);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  min-height: 100dvh;
}

a {
  color: var(--color-reiwa);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  opacity: 0.8;
}

/* スクリーンリーダー用非表示 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* スキップリンク */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  padding: 12px 24px;
  background: var(--color-text-primary);
  color: var(--color-bg);
  border-radius: 0 0 8px 8px;
  z-index: 1000;
  font-weight: 700;
  text-decoration: none;
}

.skip-link:focus {
  top: 0;
}

/* ========================================
   ヘッダー
   ======================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 248, 245, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  transition: padding var(--transition-normal), box-shadow var(--transition-normal);
  padding: 20px 16px;
}

@media (prefers-color-scheme: dark) {
  .site-header {
    background: rgba(26, 26, 26, 0.95);
  }
}

.site-header.scrolled {
  padding: 10px 16px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  text-align: center;
}

.site-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.3;
  transition: font-size var(--transition-normal);
  letter-spacing: 0.02em;
}

.site-header.scrolled .site-title {
  font-size: var(--text-lg);
}

.site-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: 4px;
  transition: opacity var(--transition-normal), height var(--transition-normal);
}

.site-header.scrolled .site-subtitle {
  opacity: 0;
  height: 0;
  overflow: hidden;
  margin: 0;
}

/* ========================================
   メインレイアウト
   ======================================== */
.page-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 16px;
}

main {
  padding-top: 24px;
  padding-bottom: 48px;
}

/* ========================================
   今年の情報カード
   ======================================== */
.current-info {
  display: flex;
  gap: 16px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  padding: 16px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  margin-bottom: 20px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.current-info__item {
  font-size: var(--text-lg);
  font-weight: 600;
}

.current-info__label {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  display: block;
  margin-bottom: 2px;
  font-weight: 400;
}

/* ========================================
   元号ナビゲーション
   ======================================== */
.era-nav {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.era-nav a {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 20px;
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  color: #FFFFFF;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.era-nav a:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.era-nav a[data-era="reiwa"]  { background: var(--color-reiwa); }
.era-nav a[data-era="heisei"] { background: var(--color-heisei); }
.era-nav a[data-era="showa"]  { background: var(--color-showa); }
.era-nav a[data-era="taisho"] { background: var(--color-taisho); }
.era-nav a[data-era="meiji"]  { background: var(--color-meiji); }

/* ========================================
   検索バー
   ======================================== */
.search-section {
  margin-bottom: 20px;
}

.search-wrapper {
  position: relative;
  max-width: 400px;
  margin: 0 auto;
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-secondary);
  pointer-events: none;
  font-size: 18px;
}

#search-input {
  width: 100%;
  padding: 12px 40px 12px 42px;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  font-size: var(--text-base);
  font-family: var(--font-main);
  background: var(--color-surface);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 48px;
}

#search-input:focus {
  border-color: var(--color-reiwa);
  box-shadow: 0 0 0 3px var(--color-search-focus);
  outline: none;
}

#search-input::placeholder {
  color: var(--color-text-secondary);
}

#search-clear {
  display: none;
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--color-text-secondary);
  width: 32px;
  height: 32px;
  line-height: 32px;
  text-align: center;
  border-radius: 50%;
}

#search-clear:hover {
  background: var(--color-bg-secondary);
}

/* ========================================
   テーブル
   ======================================== */
.table-section {
  margin-bottom: 24px;
}

.table-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  background: var(--color-surface);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

.age-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  table-layout: fixed;
}

/* テーブルヘッダー */
.age-table thead th {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--color-bg-secondary);
  border-bottom: 2px solid var(--color-border);
  padding: 14px 12px;
  font-size: var(--text-base);
  font-weight: 700;
  white-space: nowrap;
  text-align: center;
  letter-spacing: 0.05em;
}

/* スティッキーヘッダーの影 */
.age-table thead th::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.05), transparent);
  pointer-events: none;
}

/* 列幅 */
.col-age    { width: 14%; }
.col-year   { width: 16%; }
.col-wareki { width: 44%; }
.col-eto    { width: 26%; }

/* テーブルセル */
.age-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-base);
  line-height: 1.5;
  vertical-align: middle;
  transition: background-color var(--transition-fast);
}

.cell-number {
  text-align: center;
  font-family: var(--font-number);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}

.cell-wareki {
  text-align: left;
  padding-left: 16px;
}

.cell-eto {
  text-align: center;
  white-space: nowrap;
}

/* ゼブラストライプ（時代色ベース） */
.age-table tr.era-reiwa:nth-child(even)  { background: var(--color-reiwa-bg); }
.age-table tr.era-heisei:nth-child(even) { background: var(--color-heisei-bg); }
.age-table tr.era-showa:nth-child(even)  { background: var(--color-showa-bg); }
.age-table tr.era-taisho:nth-child(even) { background: var(--color-taisho-bg); }
.age-table tr.era-meiji:nth-child(even)  { background: var(--color-meiji-bg); }

/* 時代境界線 */
.age-table tr.era-boundary td {
  border-top: 3px solid var(--color-border);
}

/* ホバー */
.age-table tbody tr:hover {
  background: var(--color-hover) !important;
  transition: background-color var(--transition-fast);
}

/* 今年の行 */
.age-table tr.current-year {
  background: var(--color-current-year) !important;
  position: relative;
}

.age-table tr.current-year td:first-child {
  border-left: 4px solid var(--color-current-year-accent);
}

.age-table tr.current-year td {
  font-weight: 700;
}

/* 元号バッジ */
.era-badge {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  color: #FFFFFF;
  margin-right: 4px;
  vertical-align: middle;
  letter-spacing: 0.05em;
}

.era-badge--reiwa  { background: var(--color-reiwa); }
.era-badge--heisei { background: var(--color-heisei); }
.era-badge--showa  { background: var(--color-showa); }
.era-badge--taisho { background: var(--color-taisho); }
.era-badge--meiji  { background: var(--color-meiji); }

.era-separator {
  color: var(--color-text-secondary);
  margin: 0 2px;
}

/* 西暦リンク */
.year-link {
  color: var(--color-reiwa);
  font-weight: 600;
  text-decoration: none;
}

.year-link:hover {
  text-decoration: underline;
  opacity: 1;
}

/* 干支セル */
.eto-emoji {
  margin-right: 4px;
  font-size: 1.1em;
}

.eto-name {
  font-weight: 600;
}

.eto-reading {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-left: 2px;
}

/* ========================================
   厄年バッジ
   ======================================== */
.yaku-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  justify-content: center;
  margin-top: 4px;
}

.yaku-badge {
  display: inline-block;
  font-size: 10px;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 3px;
  line-height: 1.4;
  white-space: nowrap;
}

.yaku-badge--maeyaku {
  background: #FEF3C7;
  color: #92400E;
  border: 1px solid #F59E0B;
}

.yaku-badge--honnyaku {
  background: #FEE2E2;
  color: #991B1B;
  border: 1px solid #EF4444;
}

.yaku-badge--atoyaku {
  background: #E0E7FF;
  color: #3730A3;
  border: 1px solid #6366F1;
}

.yaku-badge--taiyaku {
  background: #DC2626;
  color: #FFFFFF;
  border: 1px solid #DC2626;
  font-size: 11px;
}

/* ダークモード厄年バッジ */
@media (prefers-color-scheme: dark) {
  .yaku-badge--maeyaku {
    background: #78350F;
    color: #FEF3C7;
    border-color: #D97706;
  }
  .yaku-badge--honnyaku {
    background: #7F1D1D;
    color: #FEE2E2;
    border-color: #EF4444;
  }
  .yaku-badge--atoyaku {
    background: #312E81;
    color: #E0E7FF;
    border-color: #6366F1;
  }
  .yaku-badge--taiyaku {
    background: #DC2626;
    color: #FFFFFF;
  }
}

/* 厄年行のハイライト */
.age-table tr.has-yakudoshi {
  background: rgba(239, 68, 68, 0.03);
}

/* ========================================
   サブページリンク
   ======================================== */
.sub-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
  margin: 24px 0;
}

.sub-link-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  text-decoration: none;
  color: var(--color-text-primary);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.sub-link-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  opacity: 1;
}

.sub-link-card__emoji {
  font-size: 2rem;
  line-height: 1;
}

.sub-link-card__text {
  display: flex;
  flex-direction: column;
}

.sub-link-card__text strong {
  font-size: var(--text-base);
}

.sub-link-card__text span:last-child {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* ========================================
   注釈
   ======================================== */
.note-section {
  margin-top: 24px;
  padding: 16px 20px;
  background: var(--color-bg-secondary);
  border-radius: 8px;
  border-left: 4px solid var(--color-reiwa);
}

.note-section h2 {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: 8px;
}

.note-section ul {
  margin: 0;
  padding-left: 20px;
}

.note-section li {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: 4px;
  line-height: 1.7;
}

/* ========================================
   広告枠
   ======================================== */
.ad-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-secondary);
  border: 1px dashed var(--color-border);
  border-radius: 8px;
  min-height: 90px;
  margin: 20px auto;
  max-width: 728px;
  position: relative;
  overflow: hidden;
}

.ad-slot::before {
  content: "広告";
  position: absolute;
  top: 4px;
  left: 10px;
  font-size: 10px;
  color: var(--color-text-secondary);
  letter-spacing: 0.1em;
}

.ad-slot--placeholder {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

/* ========================================
   フッター
   ======================================== */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 24px 16px;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
}

.site-footer nav {
  margin-bottom: 12px;
}

.site-footer nav a {
  margin: 0 12px;
  color: var(--color-text-secondary);
}

.site-footer .copyright {
  font-size: var(--text-xs);
}

/* ========================================
   トップへ戻るボタン
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-text-primary);
  color: var(--color-bg);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
  z-index: 50;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  font-size: 20px;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

/* ========================================
   レスポンシブ
   ======================================== */

/* タブレット */
@media (max-width: 768px) {
  .site-title {
    font-size: var(--text-xl);
  }

  .site-header.scrolled .site-title {
    font-size: var(--text-base);
  }

  .current-info {
    flex-direction: column;
    gap: 8px;
    padding: 12px 16px;
  }

  .col-wareki { width: 40%; }
}

/* モバイル */
@media (max-width: 600px) {
  :root {
    --header-height: 60px;
  }

  .site-header {
    padding: 12px 12px;
  }

  .site-title {
    font-size: var(--text-lg);
  }

  .site-header.scrolled .site-title {
    font-size: var(--text-sm);
  }

  .page-wrapper {
    padding: 0 8px;
  }

  main {
    padding-top: 16px;
  }

  .era-nav a {
    padding: 5px 12px;
    font-size: var(--text-xs);
  }

  .table-container {
    border-radius: 8px;
  }

  .age-table {
    font-size: var(--text-sm);
  }

  .age-table thead th {
    padding: 10px 6px;
    font-size: var(--text-sm);
  }

  .age-table td {
    padding: 8px 6px;
  }

  .yaku-badge {
    font-size: 8px;
    padding: 0 4px;
  }

  .col-age    { width: 18%; }
  .col-year   { width: 15%; }
  .col-wareki { width: 42%; }
  .col-eto    { width: 30%; }

  .era-badge {
    font-size: 10px;
    padding: 1px 5px;
    margin-right: 2px;
  }

  .eto-reading {
    display: none;
  }

  .cell-wareki {
    padding-left: 8px;
  }

  .ad-slot {
    min-height: 50px;
    max-width: 320px;
  }

  .back-to-top {
    bottom: 16px;
    right: 16px;
    width: 42px;
    height: 42px;
  }
}

/* ========================================
   印刷
   ======================================== */
@media print {
  .site-header,
  .search-section,
  .era-nav,
  .ad-slot,
  .back-to-top,
  .site-footer nav,
  #search-clear {
    display: none !important;
  }

  body {
    font-size: 10pt;
    color: #000;
    background: #fff;
  }

  .page-wrapper {
    max-width: 100%;
    padding: 0;
  }

  .table-container {
    border: none;
    box-shadow: none;
    overflow: visible;
  }

  .age-table {
    font-size: 9pt;
  }

  .age-table thead th {
    background: #f0f0f0 !important;
    color: #000;
    position: static;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .age-table tr.current-year {
    background: #fff3cd !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .era-badge {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  .note-section {
    page-break-inside: avoid;
  }
}

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

/* ========================================
   フォーカス
   ======================================== */
:focus-visible {
  outline: 3px solid var(--color-current-year-accent);
  outline-offset: 2px;
}