/* Layout: 盤を主役に据え、駒台を盤の上下に、記録と設定を右の帳面（パネル）に置く。 */
:root {
  --bg: #e6ebef;          /* 白藍がかった紙 */
  --surface: #f6f8fa;
  --fg: #1c2531;          /* 墨 */
  --muted: #5b6878;
  --accent: #2d4c7c;      /* 藍 */
  --accent-fg: #f6f8fa;
  --rule: #c9d2dc;
  --danger: #b4372f;      /* 朱（警告） */
  --wood: #e0b468;        /* 榧の盤 */
  --wood-dark: #c9974a;
  --line: #3d2a12;
  --boxwood: #f3dca6;     /* 黄楊の駒 */
  --boxwood-edge: #c89c5c;
  --ink: #17120c;
  --ink-red: #a8261d;     /* と金の朱 */
  --mark: rgba(45, 76, 124, 0.30);
  --last: rgba(45, 76, 124, 0.20);
  --danger-wash: rgba(180, 55, 47, 0.22);
  --on-danger: #ffffff;
  --board-danger: #b4372f;   /* 盤上の印（盤は両テーマとも木目なので固定） */
  --on-board-danger: #ffffff;
  --camp: rgba(80, 40, 0, 0.17);
  --gold: #d99a1e;
  --warn: #9a4a00;
  --gold-wash: rgba(217, 154, 30, 0.28);
  --win-ink: #8a5a00;
  --font-display: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif;
  --font-body: "Zen Kaku Gothic New", "Hiragino Sans", "Yu Gothic", "Noto Sans JP", system-ui, sans-serif;
  --n: 9;
  --cell: clamp(30px, calc((100vw - 60px) / var(--n)), 58px);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #10161e; --surface: #18212c; --fg: #e3e8ee; --muted: #9aa7b6; --accent: #9ab6e4; --accent-fg: #10161e;
    --rule: #2b3846; --danger: #ef7d73; --wood: #cf9f55; --wood-dark: #b48440; --line: #33220c;
    --boxwood: #ecd39b; --boxwood-edge: #b88d50; --mark: rgba(18, 30, 52, 0.42); --last: rgba(18, 30, 52, 0.28);
    --danger-wash: rgba(200, 50, 40, 0.30); --on-danger: #10161e; --win-ink: #f0c060;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #10161e; --surface: #18212c; --fg: #e3e8ee; --muted: #9aa7b6; --accent: #9ab6e4; --accent-fg: #10161e;
  --rule: #2b3846; --danger: #ef7d73; --wood: #cf9f55; --wood-dark: #b48440; --line: #33220c;
  --boxwood: #ecd39b; --boxwood-edge: #b88d50; --mark: rgba(18, 30, 52, 0.42); --last: rgba(18, 30, 52, 0.28);
  --danger-wash: rgba(200, 50, 40, 0.30); --on-danger: #10161e; --win-ink: #f0c060;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-block: 20px 40px;
}
button, select { font: inherit; color: inherit; }
[hidden] { display: none !important; }

.app {
  max-width: 1040px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  grid-template-areas: "head head" "intro intro" "table panel";
  gap: 20px 36px;
  align-items: start;
}
.masthead { grid-area: head; display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2rem;
  letter-spacing: 0.12em;
  margin: 0;
  text-wrap: balance;
}
.ruleset-tag { margin: 0; color: var(--muted); font-size: 0.9rem; letter-spacing: 0.04em; }

/* ---------------------------------------------------------------- intro */
.intro {
  grid-area: intro;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 14px 18px;
  display: grid;
  gap: 8px;
  max-width: 760px;
}
.intro-title { margin: 0; font-family: var(--font-display); font-weight: 800; font-size: 1.15rem; letter-spacing: 0.1em; }
.intro-list { margin: 0; padding-left: 1.4em; display: grid; gap: 4px; }
.intro-hint { margin: 0; color: var(--muted); font-size: 0.85rem; }
.intro-actions { display: flex; gap: 8px; justify-content: flex-end; }

/* ---------------------------------------------------------------- table */
.table { grid-area: table; display: flex; flex-direction: column; align-items: center; gap: 12px; min-width: 0; }
.board-area { position: relative; display: flex; flex-direction: column; }
.files {
  display: grid;
  grid-template-columns: repeat(var(--n), var(--cell));
  padding-left: 2px;
  font-size: 0.78rem;
  color: var(--muted);
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.board-row { display: flex; }
.ranks {
  display: grid;
  grid-template-rows: repeat(var(--n), var(--cell));
  padding-top: 2px;
  width: 1.4em;
  font-size: 0.78rem;
  color: var(--muted);
  align-items: center;
  justify-items: center;
}
.board {
  position: relative;
  display: grid;
  grid-template-columns: repeat(var(--n), var(--cell));
  grid-auto-rows: var(--cell);
  border: 2px solid var(--line);
  background-color: var(--wood);
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px),
    repeating-linear-gradient(97deg, rgba(110, 60, 10, 0.07) 0 2px, transparent 2px 11px),
    linear-gradient(160deg, var(--wood) 0%, var(--wood-dark) 120%);
  background-size: var(--cell) var(--cell), var(--cell) var(--cell), auto, auto;
  background-position: -1px -1px, -1px -1px, 0 0, 0 0;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.08), 0 12px 30px -16px rgba(30, 20, 5, 0.6);
  touch-action: manipulation;
}
.star {
  position: absolute;
  width: 7px; height: 7px;
  margin: -3.5px 0 0 -3.5px;
  border-radius: 50%;
  background: var(--line);
  pointer-events: none;
}
.camp {
  position: absolute;
  left: 0; right: 0;
  background: var(--camp);
  pointer-events: none;
}
.camp-top { top: 0; border-bottom: 2px solid var(--line); }
.camp-bottom { bottom: 0; border-top: 2px solid var(--line); }
.cell {
  position: relative;
  appearance: none;
  border: 0;
  padding: 0;
  margin: 0;
  background: transparent;
  display: grid;
  place-items: center;
  cursor: default;
}
.cell.can-pick, .cell.is-target { cursor: pointer; }
.cell:focus-visible { outline: 3px solid var(--accent); outline-offset: -3px; z-index: 2; }
.cell.is-last::before, .cell.is-from::before {
  content: "";
  position: absolute;
  inset: 1px 0 0 1px;
  background: var(--last);
}
.cell.is-from::before { background: transparent; box-shadow: inset 0 0 0 2px var(--last); }
.cell.is-target::after {
  content: "";
  width: 26%;
  height: 26%;
  border-radius: 50%;
  background: var(--mark);
  position: absolute;
}

/* ヒント: 狙われている駒・相手が取りに来るマス・取れる手 */
.cell.in-danger { box-shadow: inset 0 0 0 2px var(--board-danger); }
.cell.in-danger::after {
  content: "!";
  position: absolute;
  top: 2px; right: 2px;
  width: calc(var(--cell) * 0.26); height: calc(var(--cell) * 0.26);
  border-radius: 50%;
  background: var(--board-danger);
  color: var(--on-board-danger);
  font-size: calc(var(--cell) * 0.2);
  font-weight: 700;
  line-height: calc(var(--cell) * 0.26);
  text-align: center;
  z-index: 2;
}
.spot {
  position: absolute;
  color: var(--board-danger);
  font-weight: 700;
  font-size: calc(var(--cell) * 0.42);
  line-height: 1;
  opacity: 0.75;
  pointer-events: none;
}
.cell.cap-target::after {
  width: 52%;
  height: 52%;
  background: transparent;
  border: 3px solid var(--board-danger);
}
.spot-fork { color: var(--warn); font-size: calc(var(--cell) * 0.36); opacity: 0.9; }
.cell.is-target.risky::after { background: transparent; border: 2px dashed var(--board-danger); width: 30%; height: 30%; }
.cell.cap-target.risky::after { width: 52%; height: 52%; border: 3px dashed var(--board-danger); }
.cell.win-target::after { width: 56%; height: 56%; background: transparent; border: 3px solid var(--gold); box-shadow: 0 0 0 3px var(--gold-wash); }
.cell.win-line .piece-wrap { filter: drop-shadow(0 0 6px var(--gold)) drop-shadow(0 0 2px var(--gold)); animation: line-pop 420ms ease calc(var(--seq) * 110ms) both; }
.cell.win-line .piece-wrap.down { animation-name: line-pop-down; }
@keyframes line-pop { 0% { transform: scale(1); } 50% { transform: scale(1.18); } 100% { transform: scale(1); } }
@keyframes line-pop-down { 0% { transform: rotate(180deg) scale(1); } 50% { transform: rotate(180deg) scale(1.18); } 100% { transform: rotate(180deg) scale(1); } }
.cell.win-line::before { content: ""; position: absolute; inset: 1px 0 0 1px; background: var(--gold-wash); }
.cell.will-capture::before {
  content: "";
  position: absolute;
  inset: 1px 0 0 1px;
  background: var(--danger-wash);
}
.cell.will-capture .piece-wrap { opacity: 0.55; }
.arrow-layer { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; overflow: visible; }
.arrow-layer line { stroke: var(--accent); stroke-width: 0.09; stroke-linecap: round; opacity: 0.55; }
.arrow-layer path { fill: var(--accent); opacity: 0.75; }
.arrow-layer line.why { stroke: var(--board-danger); stroke-dasharray: 0.16 0.12; opacity: 0.9; }
.arrow-layer path.why { fill: var(--board-danger); opacity: 0.9; }
.piece-wrap.ghost { opacity: 0.5; }
.cell.will-lose { box-shadow: inset 0 0 0 3px var(--board-danger); }
.cell.will-lose .piece-wrap { animation: wobble 0.9s ease-in-out infinite; }
@keyframes wobble { 0%, 100% { transform: rotate(0); } 25% { transform: rotate(-5deg); } 75% { transform: rotate(5deg); } }
.cell.will-lose .piece-wrap.down { animation-name: wobble-down; }
@keyframes wobble-down { 0%, 100% { transform: rotate(180deg); } 25% { transform: rotate(175deg); } 75% { transform: rotate(185deg); } }
.win-note { display: block; margin-top: 4px; font-weight: 700; color: var(--win-ink); }
.last-cap { display: block; margin-top: 4px; font-size: 0.9rem; color: var(--muted); }
.why-text { display: block; margin-top: 4px; color: var(--danger); font-size: 0.9rem; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 12px; margin: 0; font-size: 0.8rem; color: var(--muted); }
.legend span { display: inline-flex; align-items: center; gap: 5px; }
.lg { display: inline-block; width: 11px; height: 11px; border-radius: 50%; flex: none; }
.lg-safe { background: var(--accent); opacity: 0.6; }
.lg-risky { border: 2px dashed var(--danger); }
.lg-cap { border: 2px solid var(--danger); }
.lg-win { border: 2px solid var(--gold); }
.lg-sym { width: auto; height: auto; border-radius: 0; font-style: normal; font-weight: 700; line-height: 1; }
.lg-x { color: var(--danger); }
.lg-tri { color: var(--warn); }
.lg-danger { background: var(--danger); color: var(--on-danger); font-size: 9px; font-weight: 700; line-height: 11px; text-align: center; }
.check { display: flex; gap: 8px; align-items: flex-start; font-size: 0.9rem; cursor: pointer; }
.check input { margin-top: 0.3em; accent-color: var(--accent); }

.piece-wrap {
  width: 84%;
  height: 92%;
  filter: drop-shadow(0 1.5px 1px rgba(40, 25, 5, 0.45));
  transition: transform 120ms ease;
  position: relative;
  z-index: 1;
}
.piece {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  padding-top: 14%;
  clip-path: polygon(50% 0, 85% 13%, 100% 100%, 0 100%, 15% 13%);
  background: linear-gradient(175deg, var(--boxwood) 55%, var(--boxwood-edge) 140%);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: calc(var(--cell) * 0.46);
  line-height: 1;
  color: var(--ink);
  user-select: none;
}
.piece.is-to { color: var(--ink-red); }
.piece-wrap.down { transform: rotate(180deg); }
.cell.is-selected { outline: 3px solid var(--accent); outline-offset: -3px; }
.cell.is-selected .piece-wrap { transform: translateY(-4px) scale(1.06); filter: drop-shadow(0 5px 3px rgba(40, 25, 5, 0.45)); }
.cell.is-selected .piece-wrap.down { transform: rotate(180deg) translateY(4px) scale(1.06); }
.cell.is-captured .piece-wrap { animation: vanish 700ms ease forwards; }
.cell.is-captured .piece-wrap.down { animation-name: vanish-down; }
@keyframes vanish { 0% { opacity: 1; } 100% { opacity: 0.22; transform: scale(0.8); } }
@keyframes vanish-down { 0% { opacity: 1; transform: rotate(180deg); } 100% { opacity: 0.22; transform: rotate(180deg) scale(0.8); } }
.lost-x {
  position: absolute;
  color: var(--board-danger);
  font-weight: 700;
  font-size: calc(var(--cell) * 0.6);
  line-height: 1;
  pointer-events: none;
  animation: pop 400ms ease 250ms both;
}
@keyframes pop { 0% { opacity: 0; transform: scale(1.6); } 100% { opacity: 0.85; transform: scale(1); } }

.banner {
  position: absolute;
  left: 50%; top: 50%;
  transform: translate(-50%, -50%);
  animation: banner-in 300ms ease 900ms both;
  background: var(--surface);
  color: var(--fg);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 18px 26px;
  text-align: center;
  box-shadow: 0 18px 40px -18px rgba(0, 0, 0, 0.55);
  z-index: 5;
  min-width: min(80%, 300px);
}
.banner-high { top: 22%; }
.banner-low { top: 78%; }
@keyframes banner-in { from { opacity: 0; transform: translate(-50%, -40%); } to { opacity: 1; transform: translate(-50%, -50%); } }
.banner-title { font-family: var(--font-display); font-weight: 800; font-size: 1.6rem; letter-spacing: 0.08em; margin: 0 0 4px; }
.banner-sub { margin: 0 0 12px; color: var(--muted); }
.banner-actions { display: flex; gap: 8px; justify-content: center; }

/* ---------------------------------------------------------------- stands */
.stand {
  width: 100%;
  max-width: calc(var(--cell) * var(--n) + 30px);
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: calc(var(--cell) * 0.9);
  padding: 6px 10px;
  border-radius: 6px;
  border: 1px solid var(--rule);
  background: var(--surface);
}
.stand.is-turn { border-color: var(--accent); box-shadow: inset 4px 0 0 var(--accent); }
.stand-who { display: flex; flex-direction: column; line-height: 1.25; min-width: 5.5em; }
.stand-side { font-weight: 700; }
.stand-name { font-size: 0.8rem; color: var(--muted); }
.stand-pieces { display: flex; flex-wrap: wrap; gap: 2px; flex: 1; min-width: 0; }
.stand-pieces .piece-wrap { width: calc(var(--cell) * 0.56); height: calc(var(--cell) * 0.62); }
.stand-pieces .piece { font-size: calc(var(--cell) * 0.3); }
.stand-count { font-variant-numeric: tabular-nums; font-weight: 700; white-space: nowrap; }
.stand-count { display: flex; flex-direction: column; align-items: flex-end; line-height: 1.25; }
.stand-count small { color: var(--muted); font-weight: 400; }
.stand-line { font-size: 0.8rem; }

/* ---------------------------------------------------------------- panel */
.panel { grid-area: panel; display: flex; flex-direction: column; gap: 18px; min-width: 0; }
.status {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 12px 14px;
  min-height: 3.4em;
}
.status strong { font-size: 1.05rem; }
.status .warn { color: var(--danger); font-weight: 700; display: block; margin-top: 4px; }
.actions { display: grid; grid-template-columns: 1fr 1fr 1.5fr; gap: 8px; }
.btn {
  padding: 9px 10px;
  white-space: nowrap;
  border-radius: 6px;
  border: 1px solid var(--rule);
  background: var(--surface);
  cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn:focus-visible, select:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); font-weight: 700; }
.settings { display: flex; flex-direction: column; gap: 10px; margin: 0; }
.field { display: flex; flex-direction: column; gap: 3px; }
.field-label, .section-label {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  font-weight: 700;
  margin: 0;
}
select {
  padding: 7px 8px;
  border-radius: 6px;
  border: 1px solid var(--rule);
  background: var(--surface);
}
.hint { margin: 0; font-size: 0.8rem; color: var(--muted); }
.kifu-list {
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
  max-height: 230px;
  overflow-y: auto;
  border-top: 1px solid var(--rule);
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
}
.kifu-list li { display: grid; grid-template-columns: 2.4em 1fr; padding: 3px 2px; border-bottom: 1px solid var(--rule); }
.kifu-list li .no { color: var(--muted); }
.kifu-list li .cap { color: var(--danger); font-weight: 700; }
.kifu-list:empty::before { content: "まだ指していません"; display: block; padding: 8px 2px; color: var(--muted); }
.fold { border-top: 1px solid var(--rule); padding-top: 10px; }
.fold > summary { cursor: pointer; font-weight: 700; list-style-position: inside; }
.fold > summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.fold[open] > summary { margin-bottom: 10px; }
.fold-sub { font-weight: 400; color: var(--muted); font-size: 0.85rem; margin-left: 4px; }
.legend { flex-direction: column; }
.rules ul { padding-left: 1.2em; margin: 8px 0 0; }
.rules li { margin-bottom: 4px; }

@media (max-width: 860px) {
  .app { grid-template-columns: minmax(0, 1fr); grid-template-areas: "head" "intro" "table" "panel"; }
  .panel { max-width: 560px; width: 100%; margin: 0 auto; }
  .title { font-size: 1.6rem; }
}
@media (prefers-reduced-motion: reduce) {
  .piece-wrap { transition: none; }
  .banner, .cell.win-line .piece-wrap { animation: none; }
  .cell.is-captured .piece-wrap { animation-duration: 1ms; }
}