:root {
  --fg: #222;
  --muted: #666;
  --bg: #fafaf7;
  --accent: #8b3a2b;
  --border: #ddd;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", system-ui, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.7;
}
.site-header {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--border);
  background: #fff;
}
.site-title { font-weight: bold; font-size: 1.2rem; color: var(--accent); text-decoration: none; display: inline-flex; align-items: center; gap: 0.3rem; }
.site-icon { vertical-align: middle; flex-shrink: 0; }
.hero { display: flex; align-items: center; gap: 1.5rem; }
.hero-icon { width: 5rem; height: 5rem; flex-shrink: 0; }
.hero h1 { margin: 0; }
.site-header .blog-name { font-weight: bold; color: var(--fg); text-decoration: none; }
.site-header .blog-name:hover { color: var(--accent); }
.site-header nav { margin-left: auto; }
.site-header nav a { margin-right: 1rem; color: var(--fg); text-decoration: none; }
.site-header nav a:last-child { margin-right: 0; }
.site-header nav a:hover { color: var(--accent); }
main {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}
main.wide { max-width: none; }
main.has-sidebar { max-width: 1120px; display: grid; grid-template-columns: 1fr 220px; gap: 2rem; align-items: start; }
@media (max-width: 860px) {
  main.has-sidebar { grid-template-columns: 1fr; }
  main.has-sidebar .toc-sidebar { display: none; }
}
.toc-sidebar { position: sticky; top: 1.5rem; font-size: 0.85rem; }
.toc-sidebar > nav + nav { margin-top: 1rem; }
.toc-sidebar h2 { font-size: 0.75rem; font-weight: bold; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; margin: 0 0 0.5rem; }
.toc-sidebar ol { list-style: none; margin: 0; padding: 0; }
.toc-sidebar li { margin: 0; }
.toc-sidebar a { display: block; padding: 0.2rem 0; color: var(--muted); text-decoration: none; border-left: 2px solid var(--border); padding-left: 0.6rem; line-height: 1.4; }
.toc-sidebar a:hover { color: var(--accent); border-color: var(--accent); }
.toc-sidebar .toc-h3 > a { padding-left: 1.2rem; font-size: 0.8rem; }
.site-footer {
  text-align: center;
  padding: 2rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}
h1, h2, h3 { line-height: 1.3; }
.entry-meta { color: var(--muted); font-size: 0.9rem; }
.tag-list { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.5rem 0; padding: 0; list-style: none; }
.tag {
  display: inline-block;
  padding: 0.1rem 0.6rem;
  background: #eee;
  border-radius: 999px;
  font-size: 0.85rem;
  color: var(--fg);
  text-decoration: none;
}
.tag:hover { background: var(--accent); color: #fff; }
.tag-auto { background: transparent; border: 1px dashed var(--muted); color: var(--muted); }
.tag-auto:hover { background: var(--muted); color: #fff; border-color: var(--muted); }
.entry-list { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 0.5rem; }
.entry-list > li:not(.group-header) { padding: 0.75rem 1rem; background: #fff; border: 1px solid var(--border); border-radius: 6px; transition: border-color 0.15s; }
.entry-list > li:not(.group-header):hover { border-color: #bbb; }
.entry-list a.entry-title { font-size: 1.05rem; font-weight: bold; color: var(--fg); text-decoration: none; }
.entry-list a.entry-title:hover { color: var(--accent); }
.shogi-board {
  margin: 1.5rem auto;
  text-align: center;
  background: #fff;
  border: 1px solid var(--border, #ddd);
  border-radius: 4px;
  padding: 0.6rem 0.8rem;
}
.shogi-board-svg {
  max-width: 100%;
  height: auto;
}
.shogi-board figcaption {
  margin-top: 0.3rem;
  font-size: 0.9rem;
  color: var(--fg);
}
.shogi-svg-gote { display: none; }
.flip-board .shogi-svg-sente { display: none; }
.flip-board .shogi-svg-gote { display: inline-block; }
.shogi-fig-cap {
  margin-top: 0.3rem;
  font-size: 0.9rem;
  color: var(--fg);
  min-height: 1.2em;
}
.shogi-fig-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-top: 0.4rem;
  flex-wrap: wrap;
}
.shogi-fig-btn {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.2rem 0.6rem;
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--fg);
}
.shogi-fig-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.shogi-fig-btn:disabled { opacity: 0.4; cursor: default; }
details.answer { margin: 1.5rem 0; border: 1px solid var(--border); border-radius: 4px; padding: 0.4rem 0.8rem; background: #fafafa; }
details.answer > summary { cursor: pointer; font-weight: bold; color: var(--accent); }
details.answer[open] { padding-bottom: 0.8rem; }
details.answer[open] > summary { margin-bottom: 0.4rem; border-bottom: 1px solid var(--border); padding-bottom: 0.3rem; }
.kifu-player {
  margin: 1.5rem auto 2rem;
  padding: 1rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 6px;
  text-align: center;
  outline: none;
}
.kifu-player:focus-visible { box-shadow: 0 0 0 2px var(--accent); }
.sfen-board-wrap { position: relative; display: inline-block; max-width: 100%; }
.kp-board { display: flex; justify-content: center; }
.kp-board .shogi-board-svg { max-width: 100%; height: auto; }
.sfen-copy-btn {
  position: absolute;
  top: 0.4rem;
  right: 0.4rem;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--fg);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s;
  z-index: 2;
}
.sfen-board-wrap:hover .sfen-copy-btn,
.sfen-copy-btn:focus-visible { opacity: 1; }
.sfen-copy-btn:hover { border-color: var(--accent); color: var(--accent); }
.sfen-copy-btn::after {
  content: attr(data-tooltip);
  position: absolute;
  top: 100%;
  right: 0;
  margin-top: 0.3rem;
  padding: 0.15rem 0.5rem;
  background: rgba(34, 34, 34, 0.92);
  color: #fff;
  font-size: 0.75rem;
  border-radius: 3px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s;
}
.sfen-copy-btn:hover::after,
.sfen-copy-btn:focus-visible::after { opacity: 1; }
.sfen-board-wrap .sfen-copy-status {
  position: absolute;
  top: 0.4rem;
  left: 0.4rem;
  padding: 0.15rem 0.5rem;
  background: rgba(34, 34, 34, 0.92);
  color: #fff;
  font-size: 0.78rem;
  border-radius: 3px;
  z-index: 2;
}
.sfen-board-wrap .sfen-copy-status:empty { display: none; }
.kp-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}
.kp-btn {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.2rem 0.6rem;
  font: inherit;
  cursor: pointer;
  color: var(--fg);
  min-width: 2.4rem;
}
.kp-btn:hover { border-color: var(--accent); color: var(--accent); }
.kp-status { font-size: 0.9rem; color: var(--muted); min-width: 6rem; }
.kp-slider {
  --thumb-w: 1rem;
  display: block;
  margin-top: 0.5rem;
  margin-left: calc(var(--kp-chart-inset-left, 0%) - var(--thumb-w) / 2);
  width: calc(100% - var(--kp-chart-inset-left, 0%) - var(--kp-chart-inset-right, 0%) + var(--thumb-w));
  -webkit-appearance: none;
  appearance: none;
  height: 1.2rem;
  background: transparent;
  cursor: pointer;
}
.kp-slider::-webkit-slider-runnable-track {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
}
.kp-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: var(--thumb-w);
  height: var(--thumb-w);
  border-radius: 50%;
  background: var(--accent);
  margin-top: calc(-0.5 * var(--thumb-w) + 2px);
}
.kp-slider::-moz-range-track {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
}
.kp-slider::-moz-range-thumb {
  width: var(--thumb-w);
  height: var(--thumb-w);
  border-radius: 50%;
  background: var(--accent);
  border: none;
}
.kp-slider-ticks {
  position: relative;
  height: 6px;
  margin-top: -2px;
  margin-left: var(--kp-chart-inset-left, 0%);
  margin-right: var(--kp-chart-inset-right, 0%);
  pointer-events: none;
}
.kp-slider-tick {
  position: absolute;
  top: 0;
  width: 2px;
  height: 100%;
  background: var(--accent);
  opacity: 0.5;
  border-radius: 1px;
  transform: translateX(-50%);
}
.kp-move-label {
  display: grid;
  grid-template-columns: 2.4rem auto 1fr;
  align-items: baseline;
  gap: 0.3rem;
  margin-bottom: 0.4rem;
  padding: 0.25rem 0.5rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.95rem;
  color: var(--fg);
  min-height: 1.4em;
}
.kp-move-num { color: var(--muted); font-size: 0.8rem; text-align: right; font-variant-numeric: tabular-nums; }
.kp-move-text { font-weight: bold; }
.kp-move-time { color: var(--accent); font-variant-numeric: tabular-nums; font-size: 0.85rem; text-align: right; }
.kp-data { display: none; }
.kp-time-chart-wrap, .kp-eval-chart-wrap, .kp-combined-chart-wrap { width: 100%; }
.kp-time-chart, .kp-eval-chart, .kp-combined-chart { width: 100%; height: auto; display: block; cursor: crosshair; }
.kp-eval-chart-wrap { margin-top: 0.4rem; }
/* グラフ表示モード切り替え (重ね/分割) */
.kp-charts-toggle { margin-top: 0.3rem; text-align: right; }
.kp-charts-toggle-btn { font-size: 0.8rem; min-width: 0; padding: 0.15rem 0.5rem; }
.kp-charts-combined .kp-time-chart-wrap,
.kp-charts-combined .kp-eval-chart-wrap { display: none; }
.kp-charts-separate .kp-combined-chart-wrap { display: none; }
.kp-chart-tip {
  position: absolute;
  bottom: 100%;
  transform: translateX(-50%);
  padding: 0.15rem 0.5rem;
  background: rgba(34, 34, 34, 0.92);
  color: #fff;
  font-size: 0.78rem;
  border-radius: 3px;
  white-space: nowrap;
  pointer-events: none;
  z-index: 2;
}
.kp-source { margin-top: 0.6rem; width: 100%; max-width: 480px; }
.kp-source summary { cursor: pointer; color: var(--muted); font-size: 0.85rem; }
.kp-source-actions { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.4rem; }
.kp-sfen-actions { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.4rem; }
.kp-copy-status { font-size: 0.8rem; color: var(--muted); }
.kp-source pre {
  margin: 0.4rem 0 0;
  padding: 0.6rem 0.8rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: ui-monospace, monospace;
  font-size: 0.8rem;
  overflow-x: auto;
  white-space: pre;
  text-align: left;
}
.kp-comment-btn {
  position: fixed;
  bottom: 1rem;
  left: auto;
  right: 1rem;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  background: var(--accent, #4a90d9);
  border: none;
  cursor: pointer;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  z-index: 100;
}
.kp-comment-btn:hover { opacity: 0.85; }
.kp-comment-btn.kp-has-comment svg path { fill: currentColor; }
.kp-comment-dialog {
  position: fixed;
  bottom: 4.5rem;
  left: auto;
  right: 1rem;
  width: min(480px, calc(100vw - 2rem));
  box-sizing: border-box;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem;
  background: var(--bg, #fff);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  margin: 0;
}
.kp-comment-dialog-title { margin: 0 0 0.25rem; font-size: 1rem; font-weight: bold; }
.kp-comment-dialog-label { margin: 0 0 0.5rem; font-size: 0.9rem; color: var(--muted); }
.kp-comment-reading { margin: 0 0 0.5rem; font-size: 0.85rem; color: var(--muted); background: var(--bg-alt, #f5f5f5); border-left: 3px solid var(--border); padding: 0.3rem 0.5rem; border-radius: 2px; word-break: break-all; }
.kp-comment-text { width: 100%; box-sizing: border-box; font-size: 0.9rem; padding: 0.4rem; border: 1px solid var(--border); border-radius: 4px; resize: vertical; }
.kp-comment-actions { display: flex; align-items: center; gap: 0.5rem; margin-top: 0.5rem; }
.kp-comment-status { font-size: 0.8rem; color: var(--muted); }
.kif-comment-draft {
  white-space: pre-wrap;
  font-size: 0.85rem;
  margin: 0;
}
.shogi-error {
  color: #b00;
  background: #fee;
  padding: 0.5rem;
  border: 1px solid #fbb;
  border-radius: 4px;
}
article.kifu pre, .preview-area pre {
  background: #f4f4f0;
  padding: 0.75rem 1rem;
  border-radius: 4px;
  overflow-x: auto;
}
article.kifu blockquote, .preview-area blockquote {
  margin: 1rem 0;
  padding: 0.6rem 1rem;
  border-left: 4px solid var(--accent);
  background: #f4f4f0;
  color: var(--muted);
  border-radius: 0 4px 4px 0;
}
article.kifu blockquote > :first-child, .preview-area blockquote > :first-child { margin-top: 0; }
article.kifu blockquote > :last-child, .preview-area blockquote > :last-child { margin-bottom: 0; }
.kif-headers {
  font-size: 0.9rem;
  background: #fff;
  border: 1px solid var(--border);
  padding: 0.75rem 1rem;
  border-radius: 4px;
}
.kif-headers dt { font-weight: bold; color: var(--muted); float: left; clear: left; width: 6em; }
.kif-headers dd { margin-left: 6em; }