/* ダム旅 / DAM TABI — ダムごとの静的ページ・一覧ページ用（地図画面とは独立） */

:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #16202b;
  --ink-soft: #5b6875;
  --ink-faint: #8a95a1;
  --line: #dde3ea;
  --accent: #14507d;
  --nodata: #94a3b8;
  color-scheme: light;
}

* { box-sizing: border-box; }

body.doc {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Yu Gothic",
               "Noto Sans JP", system-ui, sans-serif;
  line-height: 1.75;
  -webkit-text-size-adjust: 100%;
}

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 20px 20px 56px;
}

a { color: var(--accent); }

/* ---------------------------------------------------------- crumbs */

.crumbs {
  font-size: 12px;
  color: var(--ink-faint);
  margin-bottom: 18px;
  overflow-wrap: anywhere;
}

.crumbs a { color: var(--ink-soft); text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }

/* ---------------------------------------------------------- article */

.dam-page, .wrap > h1 { background: transparent; }

h1 {
  font-size: 28px;
  line-height: 1.35;
  margin: 0 0 4px;
  letter-spacing: .01em;
}

h1 .kana {
  display: block;
  font-size: 12px;
  font-weight: 400;
  color: var(--ink-faint);
  letter-spacing: .06em;
  margin-top: 2px;
}

.dam-sub {
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-size: 13px;
}

.lead { color: var(--ink-soft); font-size: 14px; margin: 0 0 18px; }

/* --- イラスト差し込み領域（地図画面と同じくここを空けてある） --- */

.dam-illust {
  position: relative;
  aspect-ratio: 16 / 9;
  max-height: 320px;
  background: linear-gradient(160deg, #e8eef4 0%, #dbe6ef 100%);
  border: 1px solid var(--line);
  border-radius: 12px;
  display: grid;
  place-items: center;
  overflow: hidden;
  margin-bottom: 20px;
}

.dam-illust img { width: 100%; height: 100%; object-fit: cover; display: block; }
.dam-illust .placeholder { text-align: center; color: #93a5b6; font-size: 12px; }

/* --- 貯水率 2 枚組 --- */

.rates {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.rate {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px 16px;
  background: var(--surface);
  min-width: 0;
}

.rate .k {
  font-size: 12px;
  color: var(--ink-soft);
  font-weight: 600;
  display: block;
  margin-bottom: 4px;
}

.rate .v {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  display: flex;
  align-items: baseline;
  gap: 3px;
}

.rate .v .unit { font-size: 17px; font-weight: 600; color: var(--ink-soft); }
.rate.is-nodata .v { color: var(--nodata); }

.rate .why {
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: #a3562a;
  background: #fdf3e8;
  border-radius: 6px;
  padding: 6px 9px;
}

.rate .bar {
  margin-top: 10px;
  height: 6px;
  border-radius: 3px;
  background: #e6ebf0;
  overflow: hidden;
}

.rate .bar > i { display: block; height: 100%; border-radius: 3px; }

.nodata-note {
  background: #fdf3e8;
  border-left: 3px solid #d99a5b;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  color: #7a4318;
  margin: 0 0 20px;
}


/* --- 用語ヘルプ（〇で囲んだ「?」） --------------------------------
   details/summary なので JS が無くても開閉できる。
   本文は .rates を基準に絶対配置し、カード幅ではなく全幅で読ませる。 */

.rates { position: relative; }

.rate .k {
  display: flex;
  align-items: center;
  gap: 5px;
}

details.help { display: inline; }

details.help > summary {
  list-style: none;
  display: inline-grid;
  place-items: center;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  border: 1.2px solid currentColor;
  color: var(--ink-faint);
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: background-color .12s ease, color .12s ease, border-color .12s ease;
}

details.help > summary::-webkit-details-marker { display: none; }
/* 見た目は小さいままで、指で押せるようタップ領域だけ広げる */
details.help > summary { position: relative; }
details.help > summary::after {
  content: "";
  position: absolute;
  inset: -13px;
}

details.help > summary::marker { content: ""; }

details.help > summary:hover,
details.help[open] > summary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

details.help > summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.help-body {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 6px);
  z-index: 6;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: 14px 16px;
  font-size: 13px;
  font-weight: 400;
  line-height: 1.8;
  color: var(--ink);
  text-align: left;
}

.help-body b { color: var(--accent); font-weight: 700; }

/* --- 鮮度表示：貯水率のすぐ下に「いつの値か」を必ず出す --- */

.freshness {
  margin: -8px 0 20px;
  font-size: 13px;
  color: var(--ink-soft);
}

.freshness .gen { color: var(--ink-faint); font-size: 12px; }

.freshness .age { color: var(--ink); font-weight: 600; }

/* 注意（通常の更新間隔を超えた） */
.freshness .stale {
  display: block;
  margin-top: 8px;
  padding: 8px 12px;
  border-radius: 8px;
  background: #fdf3e8;
  border-left: 3px solid #d99a5b;
  color: #7a4318;
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.6;
}

/* 警告（かなり間隔が空いた） */
.freshness .stale.warn {
  background: #fbe9e7;
  border-left-color: #c0392b;
  color: #8a2b1c;
}

.freshness .stale a { color: inherit; font-weight: 700; }

.stale-bar {
  margin: 0 0 16px;
  padding: 9px 14px;
  border-radius: 8px;
  background: #8a4b12;
  color: #fff;
  font-size: 12.5px;
  line-height: 1.6;
}

/* --- 表 --- */

.facts, .list {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  font-size: 14px;
}

.facts th, .facts td, .list th, .list td {
  text-align: left;
  padding: 11px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.facts tr:last-child th, .facts tr:last-child td,
.list tbody tr:last-child td { border-bottom: 0; }

.facts th { width: 34%; color: var(--ink-soft); font-weight: 600; }
.facts td { font-variant-numeric: tabular-nums; }
.facts td.muted, .list td.muted { color: var(--nodata); }

.table-scroll { overflow-x: auto; }
.list { min-width: 700px; }
.list td:first-child, .list td:last-child { white-space: nowrap; }
.list th:nth-child(3), .list th:nth-child(4),
.list td:nth-child(3), .list td:nth-child(4) { width: 21%; }
.list thead th { background: #eef2f6; font-size: 12px; color: var(--ink-soft); }
.list td { font-variant-numeric: tabular-nums; }

/* --- 注記 --- */

.callout {
  margin-top: 18px;
  padding: 12px 15px;
  border-radius: 10px;
  font-size: 13px;
  line-height: 1.75;
  background: #eef4fa;
  color: #2a4f72;
  border-left: 3px solid #7ba7cc;
}

.callout.note { background: #f1f3f5; color: var(--ink-soft); border-left-color: #c3cbd4; }

.obs-src { font-size: 12px; color: var(--ink-faint); margin-top: 16px; }

.backlink { margin-top: 24px; font-size: 15px; font-weight: 600; }

/* --- 出典セクション：基本情報とデータの出どころを分けて示す --- */

.sources {
  margin-top: 26px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.sources h2 {
  font-size: 15px;
  margin: 0 0 12px;
  color: var(--ink-soft);
}

.src-item { margin-bottom: 14px; }

.src-item h3 {
  font-size: 12px;
  font-weight: 700;
  color: var(--ink-soft);
  margin: 0 0 3px;
  letter-spacing: .02em;
}

.src-item p { margin: 0; font-size: 13px; line-height: 1.75; }
.src-item .src-note { color: var(--ink-faint); font-size: 12px; }

/* --- 出典（常時表示） --- */

.credits {
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.credits p { margin: 0 0 2px; }

.credits .producer {
  margin-top: 8px;
  letter-spacing: .1em;
  font-weight: 700;
  font-size: 11px;
  opacity: .6;
}
.credits a { color: var(--ink-soft); }

.updated { font-size: 11px; color: var(--ink-faint); margin-top: 12px; }

@media (max-width: 560px) {
  .wrap { padding: 16px 14px 44px; }
  h1 { font-size: 22px; }
  .rate .v { font-size: 32px; }
  .facts th, .facts td { padding: 10px 12px; }
}