:root {
  --ink: #1d2230;
  --ink-soft: #5b6375;
  --bg: #f1efe9;
  --board: #14614f;
  --board-deep: #0e4a3c;
  --grid: rgba(0, 0, 0, 0.35);
  --black: #1b1d24;
  --white: #f7f5ef;
  --gold: #f2c14e;
  --primary: #e2412c;
  --primary-dark: #b52f1d;
  --line: #ddd8cc;
  --font: "Zen Kaku Gothic New", system-ui, sans-serif;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); font-weight: 500; line-height: 1.6; }
.hidden { display: none !important; }
.nb { display: inline-block; }

.g-head { display: flex; align-items: center; gap: 10px; padding: 10px 16px; max-width: 560px; margin: 0 auto; font-size: 13px; font-weight: 900; }
.g-brand { color: var(--ink-soft); text-decoration: none; }
.g-title { flex: 1; text-align: center; }
.g-head [data-mg-account] a { color: var(--board); text-decoration: none; }

main { max-width: 560px; margin: 0 auto; padding: 0 10px 24px; }
.play { position: relative; user-select: none; -webkit-user-select: none; }

/* 石の数 */
.score { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 8px; padding: 2px 0 10px; }
.side { display: flex; align-items: center; gap: 6px; padding: 6px 10px; border-radius: 12px; background: #fff; border: 2px solid transparent; transition: border-color 0.2s; min-width: 0; }
.side.cpu { justify-content: flex-end; }
.side.active { border-color: var(--gold); }
.side .who { font-size: 12px; font-weight: 900; color: var(--ink-soft); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.side b { font: 800 26px/1 "Big Shoulders Display", sans-serif; font-variant-numeric: tabular-nums; }
.turn { font-size: 12px; font-weight: 900; color: var(--ink-soft); text-align: center; min-width: 4.5em; }
.disc-ico { flex: none; display: inline-block; width: 18px; height: 18px; border-radius: 50%; vertical-align: -4px; }
.disc-ico.b { background: radial-gradient(circle at 35% 30%, #4a4f5c, var(--black) 60%); }
.disc-ico.w { background: radial-gradient(circle at 35% 30%, #fff, #dcd8cc 70%); box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.15); }

/* 盤 */
.board-wrap { padding: 8px; background: var(--board-deep); border-radius: 14px; box-shadow: 0 10px 24px rgba(14, 74, 60, 0.3); }
.board { display: grid; grid-template-columns: repeat(8, 1fr); aspect-ratio: 1; background: var(--board); border: 1px solid var(--grid); position: relative; }
.board::after { content: ""; position: absolute; inset: 0; pointer-events: none; background:
  radial-gradient(circle, var(--grid) 3px, transparent 3.5px) 25% 25% / 50% 50% no-repeat,
  radial-gradient(circle, var(--grid) 3px, transparent 3.5px) 75% 25% / 50% 50% no-repeat; }
.sq { position: relative; border: 0; border-right: 1px solid var(--grid); border-bottom: 1px solid var(--grid); background: transparent; padding: 0; cursor: default; }
.sq:nth-child(8n) { border-right: 0; }
.sq:nth-child(n+57) { border-bottom: 0; }
.sq.can { cursor: pointer; }
.sq.can::before { content: ""; position: absolute; left: 50%; top: 50%; width: 22%; height: 22%; transform: translate(-50%, -50%); border-radius: 50%; background: rgba(255, 255, 255, 0.28); }
.sq.can:hover::before { background: rgba(255, 255, 255, 0.55); }
.disc { position: absolute; inset: 9%; border-radius: 50%; transition: background 0.18s; }
.disc.b { background: radial-gradient(circle at 35% 30%, #4a4f5c, var(--black) 62%); box-shadow: 0 2px 3px rgba(0, 0, 0, 0.45); }
.disc.w { background: radial-gradient(circle at 35% 30%, #fff, #dcd8cc 72%); box-shadow: 0 2px 3px rgba(0, 0, 0, 0.35); }
.disc.flip { animation: flip 0.36s ease-in-out; }
.disc.put { animation: put 0.22s ease-out; }
@keyframes flip { 0% { transform: scaleX(1); } 50% { transform: scaleX(0.06); } 100% { transform: scaleX(1); } }
@keyframes put { from { transform: scale(0.4); opacity: 0.4; } }
.sq.last::after { content: ""; position: absolute; left: 50%; top: 50%; width: 14%; height: 14%; transform: translate(-50%, -50%); border-radius: 50%; background: var(--primary); z-index: 2; }

.tools { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin: 10px 2px 0; }
.badge { display: inline-block; white-space: nowrap; padding: 3px 12px; border-radius: 999px; background: var(--board); color: #fff; font-size: 12px; font-weight: 900; }
.badge.free { background: var(--ink-soft); }
.tool { white-space: nowrap; display: inline-flex; align-items: center; gap: 4px; padding: 8px 12px; border: 0; border-radius: 12px; background: #fff; color: var(--ink); font-weight: 900; font-size: 13px; font-family: var(--font); cursor: pointer; }
.tool:disabled { opacity: 0.35; cursor: default; }
#b-undo { margin-left: auto; }

@media (max-width: 359px) {  /* 小さい画面: 「あなたの番」は枠の色で示し、名前の幅を空ける */
  .score { grid-template-columns: 1fr 1fr; }
  .turn { display: none; }
  .side { padding: 6px 8px; }
  .tool { padding: 8px 10px; }
}

/* タイトル・結果（盤を隠して全体を見せる） */
.play.menu .score, .play.menu .board-wrap, .play.menu .tools { display: none; }
.card-ui { width: 100%; max-width: 400px; margin: 0 auto; background: #fff; color: var(--ink); border-radius: 18px; padding: 18px 16px 14px; text-align: center; box-shadow: 0 10px 30px rgba(29, 34, 48, 0.12); line-break: strict; }
.logo { margin: 0; font-size: 26px; font-weight: 900; letter-spacing: 0.04em; white-space: nowrap; }
.day { margin: 2px 0 10px; font-size: 13px; color: var(--ink-soft); font-weight: 900; }
.daily-box { border: 2px solid var(--board); border-radius: 16px; padding: 10px 12px; margin-bottom: 10px; }
.daily-lbl { font-size: 11px; font-weight: 900; color: var(--ink-soft); letter-spacing: 0.1em; }
.daily-name { font-size: 24px; font-weight: 900; color: var(--board); line-height: 1.3; }
.daily-desc { margin: 0; font-size: 13px; font-weight: 700; }
.daily-note { margin: 4px 0 6px; font-size: 12px; color: var(--ink-soft); }
.done { font-size: 14px; font-weight: 900; margin-top: 4px; }
.free-lbl { font-size: 12px; font-weight: 900; color: var(--ink-soft); margin: 4px 0 4px; }
.seg { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px; background: #f1efe9; border-radius: 12px; margin-bottom: 6px; }
.seg-b { display: flex; align-items: center; justify-content: center; gap: 6px; padding: 8px 4px; border: 0; border-radius: 9px; background: transparent; font: 900 14px/1.2 var(--font); color: var(--ink-soft); cursor: pointer; }
.seg-b.on { background: #fff; color: var(--ink); box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12); }
.free-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; }
.stats { font-size: 12px; color: var(--ink-soft); font-weight: 700; margin: 8px 0 0; }

.btn { display: block; width: 100%; margin: 6px 0; padding: 12px 10px; border: 0; border-radius: 14px; font: 900 16px/1.2 var(--font); cursor: pointer; background: #f1efe9; color: var(--ink); }
.btn.primary { background: var(--primary); color: #fff; box-shadow: 0 4px 0 var(--primary-dark); }
.btn.primary:active { transform: translateY(2px); box-shadow: 0 2px 0 var(--primary-dark); }
.btn.lv { margin: 0; font-size: 15px; padding: 11px 4px; }
.btn.sub { font-size: 14px; }
.btn.ghost { background: transparent; border: 2px solid var(--line); color: var(--ink-soft); font-size: 14px; }
.btn.x { background: #000; color: #fff; display: flex; align-items: center; justify-content: center; gap: 8px; }
.btn:disabled { opacity: 0.5; cursor: default; }

.clear-lbl { font-size: 13px; font-weight: 900; color: var(--board); }
.clear-res { font-size: 34px; font-weight: 900; line-height: 1.2; margin-top: 4px; }
.clear-res.win { color: var(--primary); }
.clear-count { display: flex; align-items: center; justify-content: center; gap: 10px; margin: 4px 0; }
.clear-count b { font: 800 56px/1 "Big Shoulders Display", sans-serif; font-variant-numeric: tabular-nums; }
.clear-count .dash { font: 800 32px/1 "Big Shoulders Display", sans-serif; color: var(--ink-soft); }
.clear-count .disc-ico { width: 26px; height: 26px; }
.clear-sub { margin: 0; font-size: 14px; font-weight: 700; }
.best { display: inline-block; margin: 6px 0 0; padding: 2px 12px; border-radius: 999px; background: var(--gold); font-weight: 900; font-size: 13px; }
.rank { margin: 10px 0; padding: 8px; background: #edf4f1; border-radius: 14px; }
.rank-lbl { font-size: 11px; font-weight: 900; color: var(--ink-soft); }
.rank-name { font-size: 24px; font-weight: 900; }
.share { margin: 8px 0; }
/* 終局の盤面を見るとき（結果の画面を閉じて盤を出す） */
.play.review .tools .tool#b-undo { display: none; }

.toast { position: absolute; left: 50%; top: 42%; transform: translate(-50%, -50%); z-index: 40; max-width: calc(100% - 24px); padding: 10px 18px; border-radius: 16px; background: rgba(20, 24, 36, 0.92); color: #fff; font-weight: 900; font-size: 14px; text-align: center; pointer-events: none; }

/* 下の解説 */
.guide { margin-top: 24px; background: #fff; border-radius: 18px; padding: 18px 18px 8px; font-size: 15px; line-break: strict; }
.guide h2 { font-size: 19px; margin: 18px 0 8px; padding-left: 10px; border-left: 5px solid var(--board); }
.guide h2:first-child { margin-top: 0; }
.guide h3 { font-size: 16px; margin: 14px 0 4px; }
.guide ul { padding-left: 1.3em; }
.guide .steps { list-style: none; padding: 0; }
.guide .steps li { display: flex; align-items: baseline; gap: 6px; margin: 6px 0; }
.guide .steps .num { flex: none; font-weight: 900; color: var(--board); }
.guide details { border-top: 1px solid var(--line); padding: 8px 0; }
.guide summary { font-weight: 900; cursor: pointer; }
.guide a { color: var(--board); }
.g-foot { max-width: 560px; margin: 0 auto; padding: 12px 16px 28px; font-size: 12px; text-align: center; }
.g-foot a { color: var(--ink-soft); }

.card-ui .mg-box { background: #edf4f1; border-color: transparent; }

/* 解説の余白と行間（ポータルと同じ決まり: 行間 1.85・段落の間は1行分・見出しは前を広く後ろを狭く） */
.guide { line-height: 1.85; padding: 22px 20px 12px; }
.guide p { margin: 0 0 1em; }
.guide h2 { margin: 32px 0 12px; line-height: 1.4; }
.guide h2:first-child { margin-top: 0; }
.guide h3 { margin: 22px 0 6px; line-height: 1.5; }
.guide ul, .guide ol { margin: 0 0 1em; }
.guide li { margin: 6px 0; }
.guide details { padding: 12px 0; }
.guide details p { margin: 8px 0 4px; }