/* 紙・黒線。影とグラデーションは使わない。色は真ん中の盤の木の色、付箋の黄色、自分の勝ちの赤い線、相手の5つの灰色の線だけ。 */
:root {
  --ink: #30302e;
  --dim: #85827a;
  --paper: #f5f4ef;
  --card: #fff;
  --soft: #d9d6cd;
  --gridline: #dddad1;
  --mono: ui-monospace, "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Noto Sans CJK JP", "Yu Gothic", monospace;
  --red: #c8352a;
  --pen: "Klee One", "Klee", "YuKyokasho", "Hiragino Maru Gothic ProN", "Hiragino Sans", "Noto Sans JP", "Noto Sans CJK JP", sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { margin: 0; padding: 0; height: 100%; background: var(--paper); touch-action: manipulation; }

body {
  color: var(--ink);
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Noto Sans CJK JP", "Yu Gothic", system-ui, sans-serif;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
  overscroll-behavior: none;
  -webkit-tap-highlight-color: transparent;
  overflow: hidden;
}

button { font-family: inherit; color: inherit; touch-action: manipulation; -webkit-touch-callout: none; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); margin: 0; }

#app {
  position: relative;
  height: var(--app-h, 100dvh);
  max-width: 440px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  padding-top: env(safe-area-inset-top);
  overflow: hidden;
}
@media (min-width: 520px) { #app { border-left: 1px solid var(--soft); border-right: 1px solid var(--soft); } }

#main { flex: 1 1 auto; overflow-y: auto; overflow-x: hidden; -webkit-overflow-scrolling: touch; }
#foot { padding: 10px 14px 16px; font-size: 12px; text-align: center; }

/* --- ノート --- */
.play { min-height: 100%; display: flex; flex-direction: column; justify-content: center; padding: 5px 0; }
.note { position: relative; margin: 0 auto; transition: transform .3s ease, opacity .3s ease; }
.note.out { transform: translateX(-40%); opacity: 0; }
.note.in0 { transform: translateX(30%); opacity: 0; transition: none; }
.note.shake { animation: shake .32s ease; }
@keyframes shake { 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }
#board { display: block; width: 100%; height: auto; touch-action: none; }
/* 方眼: 画面の全部がマス目。字も石も UI の箱も、1マスに1つ */
#board .sheet, .mini .sheet { fill: var(--paper); stroke: none; }
#board .canvas, .mini .canvas, #board .chrome, .mini .chrome { fill: var(--paper); }
#board .grid line, #board .fgrid line, .mini .grid line, .mini .fgrid line { stroke: var(--gridline); stroke-width: 1; }
#board .box, .mini .box { fill: none; stroke: var(--ink); stroke-width: 3.5; }
#board .pbtn, .mini .pbtn { fill: none; stroke: var(--ink); stroke-width: 1.6; }
#board .lidtop, .mini .lidtop { stroke: var(--ink); stroke-width: 3.5; }
#board .panel:not(:empty) { animation: lid .2s ease-out; }
/* おおきいのルールの箱のスクロールの位置（細い棒） */
#board .sbar, .mini .sbar { fill: var(--dim); }
#board.dark .sbar, .mini.dark .sbar { fill: #8d8b84; }
/* スクロールが合わないまま2回外れた: ルールの字が少し左へずれて戻る */
#board .rulebox.peek { animation: peek .7s ease; }
@keyframes peek { 35% { transform: translateX(-14px); } 70% { transform: translateX(4px); } }
#board.still .panel { animation: none; }
@keyframes lid { from { transform: translateY(20px); opacity: 0; } to { transform: none; opacity: 1; } }
#board .bst, .mini .bst { fill: var(--ink); }
#board .wst, .mini .wst { fill: #fff; stroke: var(--ink); stroke-width: 2.2; }
#board .fill, .mini .fill { fill: var(--ink); }
#board .line, .mini .line { fill: var(--paper); stroke: var(--ink); stroke-width: 2.2; }
#board .kana, .mini .kana { fill: var(--ink); font-family: var(--mono); font-weight: 900; text-anchor: middle; }
#board .pno .kana, .mini .pno .kana { fill: var(--dim); font-size: 13px; }
/* 字の点: ふだんは字の見た目。勝ちの線が通ると石の見た目になる */
#board .as-stone, .mini .as-stone { opacity: 0; transition: opacity .35s ease; }
#board .glyph, .mini .glyph { transition: opacity .35s ease; }
#board .won .as-stone, .mini .won .as-stone { opacity: 1; }
#board .won .glyph, .mini .won .glyph { opacity: 0; }
#board .ink, .mini .ink { transform-box: fill-box; transform-origin: center; }
/* 置く: その大きさで置いて少し沈む */
#board .drawn { animation: dab .16s ease-out; }
@keyframes dab { from { transform: scale(1.18); } to { transform: scale(1); } }
/* 5つが順に弾む（字の点も石と同じに） */
#board .pulse { animation: pulse .32s ease; }
@keyframes pulse { 40% { transform: scale(1.35); } }
/* 字のマス: 揺れるだけ */
#board .wig { animation: wig .3s ease; }
@keyframes wig { 25% { transform: rotate(-12deg); } 75% { transform: rotate(10deg); } }
/* 勝ちの線（赤）・相手の5つの線（灰） */
#board .win { stroke-width: 4; stroke-linecap: round; stroke-dasharray: 100; stroke-dashoffset: 100; animation: draw .35s ease forwards; }
#board .win.mine { stroke: var(--red); }
#board .win.foe { stroke: var(--dim); stroke-width: 6; }
@keyframes draw { to { stroke-dashoffset: 0; } }
/* 相手に勝たれた: 盤面が少し暗くなる */
#board .canvas { transition: fill .3s ease; }
#board.lost .canvas { fill: #e3e1d9; }
/* 消しゴム: 置いた2つと線が消える */
#board.erasing .moves, #board.erasing .lines { opacity: 0; transition: opacity .32s ease; }

/* ダークモード: UI（紙・見出し・ルール・パネル）が暗く、字が明るくなる。盤面の箱はゲームの絵なので明るいまま */
body.dark { background: #19191c; }
body.dark #app { border-color: #333; }
#board.dark .sheet, .mini.dark .sheet, #board.dark .chrome, .mini.dark .chrome { fill: #1d1d21; }
#board.dark .grid line, .mini.dark .grid line { stroke: #34343a; }
#board.dark .box, .mini.dark .box, #board.dark .lidtop, .mini.dark .lidtop, #board.dark .pbtn, .mini.dark .pbtn { stroke: #ecebe5; }
#board.dark .ui .kana, #board.dark .rulebox .kana, #board.dark .panel .kana, .mini.dark .ui .kana, .mini.dark .rulebox .kana, .mini.dark .panel .kana { fill: #ecebe5; }
#board.dark .ui .fill, #board.dark .rulebox .fill, #board.dark .panel .fill, .mini.dark .ui .fill, .mini.dark .rulebox .fill, .mini.dark .panel .fill { fill: #ecebe5; }
#board.dark .ui .line, #board.dark .rulebox .line, #board.dark .panel .line, .mini.dark .ui .line, .mini.dark .rulebox .line, .mini.dark .panel .line { fill: #1d1d21; stroke: #ecebe5; }
#board .sheet, #board .chrome, #board .kana, #board .fill { transition: fill .25s ease; }

/* タイトル画面の「はじめる」（ノートの上に重ねる） */
.over { position: absolute; left: 0; right: 0; top: 47%; text-align: center; }
.over .btn.main { max-width: 220px; margin: 0 auto; }
.tfoot { margin-top: 14px; font-size: 12px; }

/* --- 結果 --- */
.result { padding: 10px 12px 4px; text-align: center; }
.stack { position: relative; width: 74%; max-width: 300px; margin: 6px auto 20px; aspect-ratio: 402 / 522; }
.mini { position: absolute; inset: 0; width: 100%; height: 100%; background: var(--paper); border: 1.5px solid var(--ink); }
.mini .win { stroke-dasharray: none; stroke-dashoffset: 0; animation: none; }
.mini.m0 { transform: translate(-10%, 5%) rotate(-6deg); }
.mini.m1 { transform: translate(-6%, 3%) rotate(-3.5deg); }
.mini.m2 { transform: translate(-2%, 2%) rotate(-1.5deg); }
.mini.m3 { transform: translate(3%, 2%) rotate(2deg); }
.mini.m4 { transform: translate(6%, 1%) rotate(3.5deg); }
.mini.m5 { transform: rotate(-.5deg); }
.mini .win { stroke-width: 4; stroke-linecap: round; stroke: var(--red); }

.btn {
  display: flex; align-items: center; justify-content: center; gap: 4px; width: 100%; max-width: 320px; height: 46px; margin: 8px auto;
  font-size: 16px; font-weight: 700; border: 2px solid var(--ink); border-radius: 6px; background: var(--card); color: var(--ink); text-decoration: none; cursor: pointer;
}
.btn.x { background: var(--ink); color: #fff; }
.xlogo { width: 18px; height: 18px; }
.sn-after { margin-top: 10px; }

.toast {
  position: fixed; left: 50%; bottom: 30%; transform: translateX(-50%); padding: 8px 14px; font-size: 14px;
  background: var(--card); border: 1.5px solid var(--ink); border-radius: 4px; transition: opacity .5s; z-index: 10; pointer-events: none;
}
.toast.out { opacity: 0; }