:root{
  --bg0:#020617; --bg1:#0b1220; --bg2:#111827;
  --panel:rgba(15,23,42,.78); --text:#e5eefb; --muted:#94a3b8;
  --cyan:#38bdf8; --green:#34d399; --red:#fb7185; --violet:#a78bfa; --amber:#fbbf24;
  --boardA:#f2d8a7; --boardB:#d3a464; --boardC:#976130;
  --select:rgba(56,189,248,.18); --target:rgba(52,211,153,.24); --last:rgba(251,191,36,.24);
  --check:rgba(244,63,94,.22); --agent:rgba(167,139,250,.18); --shadow:0 24px 80px rgba(0,0,0,.45);
}
*{box-sizing:border-box}
html,body{
  margin:0;padding:0;min-height:100%;color:var(--text);
  font-family:"Hiragino Sans","Yu Gothic","Noto Sans JP",system-ui,sans-serif;
  background:
    radial-gradient(circle at 10% 10%, rgba(34,211,238,.10), transparent 24%),
    radial-gradient(circle at 90% 90%, rgba(212,169,79,.08), transparent 26%),
    linear-gradient(135deg, var(--bg0), var(--bg1) 45%, var(--bg2));
}
.glass{background:var(--panel);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border:1px solid rgba(255,255,255,.08);box-shadow:var(--shadow)}
.hero-glow{text-shadow:0 0 12px rgba(56,189,248,.25),0 0 28px rgba(56,189,248,.16),0 0 36px rgba(212,169,79,.12)}

/* ---------------- 盤 ---------------- */
.board-shell{width:min(92vw,760px);aspect-ratio:1/1;border-radius:30px;padding:20px;background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));box-shadow:var(--shadow);position:relative}
.board{
  position:relative;width:100%;height:100%;border-radius:24px;overflow:hidden;
  background:
    linear-gradient(180deg, rgba(255,255,255,.10), rgba(255,255,255,.02) 30%, rgba(0,0,0,.05)),
    repeating-linear-gradient(100deg, rgba(120,72,20,.10) 0px, rgba(120,72,20,.10) 3px, transparent 3px, transparent 9px),
    repeating-linear-gradient(178deg, rgba(255,255,255,.05) 0px, rgba(255,255,255,.05) 2px, transparent 2px, transparent 14px),
    radial-gradient(ellipse at 30% 15%, rgba(255,244,214,.5), transparent 55%),
    linear-gradient(135deg, var(--boardA), var(--boardB) 58%, var(--boardC));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.3), inset 0 -18px 30px rgba(87,49,16,.24), inset 0 0 60px rgba(87,49,16,.12);
}
.board::before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(90deg,rgba(255,255,255,.035) 0px,rgba(255,255,255,.035) 2px,rgba(0,0,0,.035) 3px,rgba(0,0,0,.035) 7px);opacity:.2;mix-blend-mode:overlay;pointer-events:none}
.board::after{content:"";position:absolute;inset:0;box-shadow:inset 0 0 90px rgba(0,0,0,.22);pointer-events:none;border-radius:24px}
.grid-board{position:absolute;inset:16px;display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);border:1.5px solid rgba(74,43,15,.86);box-shadow:inset 0 0 0 1px rgba(255,245,220,.2);z-index:1}
.grid-cell{position:relative;border-right:1px solid rgba(74,43,15,.6);border-bottom:1px solid rgba(74,43,15,.6);user-select:none;cursor:pointer;transition:background .14s ease}
.grid-cell:hover{background:rgba(255,255,255,.06)}
.grid-cell.selected{background:var(--select);box-shadow:inset 0 0 0 2px rgba(56,189,248,.5)}
.grid-cell.agent-selected{background:var(--agent);box-shadow:inset 0 0 0 2px rgba(167,139,250,.5)}
.grid-cell.last{background:var(--last)}
.grid-cell.check{background:var(--check);animation:checkPulse 1s ease-in-out infinite}
@keyframes checkPulse{0%,100%{background:rgba(244,63,94,.14)}50%{background:rgba(244,63,94,.32)}}
.grid-cell.target::after,.grid-cell.capture::after,.grid-cell.agent-target::after{
  content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);border-radius:999px;pointer-events:none
}
.grid-cell.target::after{width:18%;height:18%;background:radial-gradient(circle, rgba(52,211,153,.96), rgba(52,211,153,.6));box-shadow:0 0 16px rgba(52,211,153,.6)}
.grid-cell.capture::after{width:74%;height:74%;border:4px solid rgba(52,211,153,.9);box-shadow:0 0 20px rgba(52,211,153,.35)}
.grid-cell.agent-target::after{width:20%;height:20%;background:radial-gradient(circle, rgba(167,139,250,.96), rgba(167,139,250,.6));box-shadow:0 0 16px rgba(167,139,250,.6)}

.coord-files{position:absolute;left:16px;right:16px;top:-4px;display:grid;grid-template-columns:repeat(9,1fr);font-size:.68rem;color:rgba(255,244,220,.75);text-align:center;font-weight:700;pointer-events:none;z-index:2}
.coord-ranks{position:absolute;top:16px;bottom:16px;left:-2px;display:grid;grid-template-rows:repeat(9,1fr);font-size:.68rem;color:rgba(255,244,220,.75);align-items:center;font-weight:700;pointer-events:none;z-index:2;writing-mode:vertical-rl}

.piece-layer{position:absolute;inset:16px;z-index:2;pointer-events:none}
.piece-node{position:absolute;width:calc(100% / 9);height:calc(100% / 9);padding:5px;transition:transform .24s cubic-bezier(.2,.8,.2,1), filter .18s ease, opacity .18s ease;will-change:transform;pointer-events:none}
.piece-card{width:100%;height:100%;display:flex;align-items:center;justify-content:center;clip-path:polygon(50% 0%, 89% 14%, 100% 100%, 0% 100%, 11% 14%);border-radius:18% 18% 24% 24%;border:1px solid rgba(104,67,20,.56);box-shadow:inset 0 1px 0 rgba(255,255,255,.4), inset 0 -6px 10px rgba(120,72,20,.16), 0 8px 18px rgba(0,0,0,.28);font-weight:900;line-height:1;letter-spacing:-.06em;position:relative;overflow:hidden}
.piece-card::before{content:"";position:absolute;inset:0;background:linear-gradient(120deg, rgba(255,255,255,.45) 0%, transparent 30%);pointer-events:none}
.piece-card.sente{background:linear-gradient(180deg,#fff6dd,#efd7a6 60%,#d9b168);color:#4b2a0a;text-shadow:0 1px 0 rgba(255,255,255,.58)}
.piece-card.gote{background:linear-gradient(180deg,#e3f6ff,#add7ed 60%,#7dc1e3);color:#0a2439;text-shadow:0 1px 0 rgba(255,255,255,.44);transform:rotate(180deg);border-color:rgba(6,78,115,.42)}
.piece-card.promoted{color:#7c1212}
.piece-card.selected{box-shadow:0 0 0 3px rgba(56,189,248,.42),0 0 24px rgba(56,189,248,.32),inset 0 1px 0 rgba(255,255,255,.34)}
.piece-card.just-moved{animation:justMoved .5s ease}
@keyframes justMoved{0%{filter:drop-shadow(0 0 0 rgba(251,191,36,0))}30%{filter:drop-shadow(0 0 10px rgba(251,191,36,.9))}100%{filter:drop-shadow(0 0 0 rgba(251,191,36,0))}}
.piece-label{font-size:clamp(18px,2.2vw,31px);transform:translateY(4%)}

.thinking-overlay{position:absolute;inset:16px;display:none;align-items:flex-end;justify-content:space-between;padding:14px;z-index:3;pointer-events:none}
.thinking-overlay.show{display:flex}
.thinking-badge{display:flex;align-items:center;gap:.6rem;padding:.7rem .9rem;border-radius:16px;background:rgba(2,6,23,.62);border:1px solid rgba(56,189,248,.24);box-shadow:0 0 24px rgba(56,189,248,.12);font-weight:700;font-size:.9rem}
.thinking-badge.agent{border-color:rgba(167,139,250,.28);box-shadow:0 0 24px rgba(167,139,250,.12)}
.hidden{display:none !important}
.dot{width:9px;height:9px;border-radius:999px;background:var(--cyan);box-shadow:0 0 14px rgba(56,189,248,.7);display:inline-block;animation:pulseDot 1.1s infinite ease-in-out}
.dot.violet{background:var(--violet);box-shadow:0 0 14px rgba(167,139,250,.7)}
.dot:nth-child(2){animation-delay:.14s}.dot:nth-child(3){animation-delay:.28s}
@keyframes pulseDot{0%,80%,100%{transform:scale(.7);opacity:.45}40%{transform:scale(1.12);opacity:1}}

.panel-title{font-size:.82rem;letter-spacing:.18em;text-transform:uppercase;color:#93c5fd}
.badge{display:inline-flex;align-items:center;gap:.35rem;padding:.3rem .7rem;border-radius:999px;border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.04);font-size:.77rem}
.badge.book{border-color:rgba(251,191,36,.4);color:#fde68a;background:rgba(251,191,36,.08)}
.badge.search{border-color:rgba(56,189,248,.4);color:#bae6fd;background:rgba(56,189,248,.08)}
.stat-card{background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.03));border:1px solid rgba(255,255,255,.06);border-radius:18px;padding:14px}

.hold-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.hand-piece{position:relative;min-height:74px;border-radius:18px;border:1px solid rgba(255,255,255,.08);background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.025));display:flex;flex-direction:column;align-items:center;justify-content:center;cursor:pointer;transition:.16s ease;user-select:none;overflow:hidden}
.hand-piece:hover{transform:translateY(-2px);border-color:rgba(56,189,248,.36);box-shadow:0 0 18px rgba(56,189,248,.1)}
.hand-piece.active{border-color:rgba(52,211,153,.6);box-shadow:0 0 0 2px rgba(52,211,153,.18), 0 0 18px rgba(52,211,153,.1)}
.hand-piece.disabled{opacity:.42;cursor:not-allowed}
.hand-koma{width:40px;height:46px;clip-path:polygon(50% 0%, 89% 14%, 100% 100%, 0% 100%, 11% 14%);display:flex;align-items:center;justify-content:center;font-weight:900;border:1px solid rgba(255,255,255,.08);box-shadow:inset 0 1px 0 rgba(255,255,255,.22);font-size:1.2rem}
.hand-koma.sente{background:linear-gradient(180deg,#fff6dd,#efd7a6 60%,#d9b168);color:#4b2a0a}
.hand-koma.gote{background:linear-gradient(180deg,#e3f6ff,#add7ed 60%,#7dc1e3);color:#0a2439;transform:rotate(180deg)}
.hand-count{position:absolute;right:8px;bottom:6px;color:#fcd34d;font-size:.78rem;font-weight:800}

.btn-neo{display:flex;align-items:center;justify-content:center;gap:.7rem;width:100%;padding:12px 16px;border-radius:16px;border:1px solid rgba(255,255,255,.08);background:linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.03));color:#e5edf7;font-weight:800;transition:.15s ease;cursor:pointer}
.btn-neo:hover{transform:translateY(-1px);border-color:rgba(56,189,248,.38);box-shadow:0 10px 24px rgba(0,0,0,.22), 0 0 20px rgba(56,189,248,.11)}
.btn-neo:disabled{opacity:.4;cursor:not-allowed;transform:none}
.btn-neo.primary{background:linear-gradient(180deg, rgba(56,189,248,.18), rgba(56,189,248,.08));border-color:rgba(56,189,248,.24)}
.btn-neo.gold{background:linear-gradient(180deg, rgba(212,169,79,.2), rgba(212,169,79,.08));border-color:rgba(212,169,79,.24)}
.btn-neo.red{background:linear-gradient(180deg, rgba(244,63,94,.16), rgba(244,63,94,.07));border-color:rgba(244,63,94,.24)}
.btn-neo.violet{background:linear-gradient(180deg, rgba(167,139,250,.22), rgba(167,139,250,.08));border-color:rgba(167,139,250,.24)}

.toggle{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 14px;border-radius:16px;border:1px solid rgba(255,255,255,.06);background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02))}
.switch{width:54px;height:30px;border-radius:999px;background:rgba(255,255,255,.10);position:relative;cursor:pointer;transition:.18s ease;border:1px solid rgba(255,255,255,.08)}
.switch::after{content:"";position:absolute;top:3px;left:3px;width:22px;height:22px;border-radius:999px;background:white;box-shadow:0 4px 12px rgba(0,0,0,.25);transition:.18s ease}
.switch.on{background:linear-gradient(90deg, rgba(167,139,250,.55), rgba(56,189,248,.55))}
.switch.on::after{left:27px}

.progress{width:100%;height:10px;border-radius:999px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.06);overflow:hidden}
.progress-fill{height:100%;width:50%;background:linear-gradient(90deg,#22d3ee,#38bdf8,#a78bfa);box-shadow:0 0 16px rgba(56,189,248,.3);transition:width .16s ease}

.pv-list,.log-list{max-height:240px;overflow:auto;scrollbar-width:thin}
.pv-item,.log-item{display:flex;gap:.7rem;padding:.55rem .1rem;border-bottom:1px solid rgba(255,255,255,.05);font-size:.92rem}
.pv-depth,.log-num{min-width:48px;color:#93c5fd;font-weight:700}
.log-item.active{background:rgba(56,189,248,.08);border-radius:10px}

.modal-bg,.promo-bg{position:fixed;inset:0;display:none;align-items:center;justify-content:center;background:rgba(2,6,23,.76);z-index:50;padding:20px}
.modal-bg.show,.promo-bg.show{display:flex}
.modal-card,.promo-card{width:min(92vw,520px);border-radius:24px;padding:24px}
.promo-actions{display:grid;grid-template-columns:1fr 1fr;gap:12px}

.hero-grid{display:grid;grid-template-columns:minmax(0,760px) minmax(360px,1fr);gap:24px;align-items:start}
@media (max-width:1100px){.hero-grid{grid-template-columns:1fr}.board-shell{width:min(96vw,760px);margin-inline:auto}}

/* ---------------- 対局者パネル ---------------- */
.player-strip{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 14px;border-radius:16px;border:1px solid rgba(255,255,255,.07);background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.02))}
.player-strip.active{border-color:rgba(52,211,153,.4);box-shadow:0 0 18px rgba(52,211,153,.12)}
.player-avatar{width:38px;height:38px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.1rem}
.player-clock{font-family:"SFMono-Regular",Consolas,monospace;font-weight:800;font-size:1.05rem;letter-spacing:.02em}

/* ---------------- 難易度 セレクタ ---------------- */
.level-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.level-btn{padding:10px 6px;border-radius:12px;border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.03);font-size:.78rem;font-weight:700;text-align:center;cursor:pointer;transition:.15s ease;color:#cbd5e1}
.level-btn.active{border-color:rgba(56,189,248,.55);background:rgba(56,189,248,.14);color:#e0f2fe;box-shadow:0 0 14px rgba(56,189,248,.18)}

/* スクロールバー装飾 */
.pv-list::-webkit-scrollbar,.log-list::-webkit-scrollbar{width:6px}
.pv-list::-webkit-scrollbar-thumb,.log-list::-webkit-scrollbar-thumb{background:rgba(148,163,184,.35);border-radius:999px}