:root{--font-display: "Fraunces", "Iowan Old Style", Georgia, serif;--font-body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace}:root{color-scheme:light;--bg: #F8F1E0;--fg: #2A1F16;--muted: #6B5C4A;--line: rgba(42, 31, 22, .16);--light: #EBDFC5;--dark: #6B5C4A;--accent: #4FA487;--legal: rgba(79, 164, 135, .55);--selected: #C97B2D;--last-move: rgba(244, 184, 96, .45);--check: rgba(232, 74, 45, .55)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--fg);font-family:Inter,system-ui,-apple-system,sans-serif;-webkit-font-smoothing:antialiased;line-height:1.45}button{font:inherit}.app{position:relative;min-height:100%;padding:clamp(8px,2vw,16px) clamp(8px,2vw,20px) 16px;max-width:560px;margin:0 auto;display:flex;flex-direction:column;gap:14px}h1{margin:0;font-family:Fraunces,serif;font-size:28px;font-weight:600;letter-spacing:-.01em}.muted{color:var(--muted);font-size:13px}.muted.small{font-size:12px}.head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.head-actions{display:flex;gap:6px}.ghost{height:36px;padding:0 10px;border:1px solid var(--line);background:transparent;color:var(--fg);cursor:pointer;border-radius:0;font-size:14px}.mode-row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.tab{height:auto;padding:6px 14px;border:1px solid var(--line);background:transparent;color:var(--fg);font-size:13px;border-radius:999px;cursor:pointer}.tab.active{background:var(--accent);border-color:var(--accent);color:#fff}.skill{display:flex;flex-direction:column;font-size:12px;color:var(--muted);gap:2px}.skill input{width:120px}.board{display:grid;grid-template-columns:repeat(8,1fr);width:min(100%,calc(100vw - 32px - env(safe-area-inset-left,0px) - env(safe-area-inset-right,0px)),72vh);max-width:520px;margin:0 auto;aspect-ratio:1 / 1;border:1px solid var(--line);user-select:none;-webkit-user-select:none;touch-action:none}.sq{position:relative;appearance:none;border:0;display:flex;align-items:center;justify-content:center;font-size:clamp(28px,8vw,52px);cursor:pointer;user-select:none;-webkit-user-select:none;transition:filter .15s ease}.sq.light{background:var(--light)}.sq.dark{background:var(--dark);color:#f4ecdc}.sq.last-from,.sq.last-to{box-shadow:inset 0 0 0 99rem var(--last-move)}.sq.selected{box-shadow:inset 0 0 0 5px var(--selected)}.sq.in-check{background:radial-gradient(circle,rgba(232,74,45,.7) 0%,transparent 70%),var(--light);animation:check-pulse 1s ease-in-out infinite}.sq.dark.in-check{background:radial-gradient(circle,rgba(232,74,45,.65) 0%,transparent 70%),var(--dark)}@keyframes check-pulse{0%,to{box-shadow:inset 0 0 0 0 var(--check)}50%{box-shadow:inset 0 0 0 6px var(--check)}}.sq.legal:after{content:"";position:absolute;width:28%;height:28%;border-radius:999px;background:var(--legal);box-shadow:0 0 0 1px #0003}.sq.legal-capture:after{content:"";position:absolute;width:88%;height:88%;border-radius:999px;border:6px solid var(--legal);background:transparent;pointer-events:none}.rank-label,.file-label{position:absolute;font-family:Inter,sans-serif;font-size:10px;font-weight:600;color:var(--muted);pointer-events:none}.rank-label{top:2px;left:4px}.file-label{bottom:2px;right:4px}.row-actions{display:flex;gap:8px;flex-wrap:wrap}.moves{display:flex;flex-direction:column;gap:4px;padding-top:8px;border-top:1px solid var(--line)}.move-list{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:4px 8px;font-family:ui-monospace,monospace;font-size:13px}.move-list li{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}.promotion-overlay,.endgame-overlay{position:fixed;inset:0;background:#14120fa6;display:flex;align-items:center;justify-content:center;z-index:100;padding:24px}.promotion-card,.endgame-card{background:var(--bg);border:1px solid var(--line);padding:24px;display:flex;flex-direction:column;gap:14px;align-items:center;max-width:360px;width:100%}.promotion-row{display:flex;gap:8px}.promotion-btn{width:64px;height:64px;border:1px solid var(--line);background:var(--light);font-size:36px;cursor:pointer;border-radius:0;transition:background .15s ease}.promotion-btn:hover{background:var(--accent);color:#fff}.endgame-title{margin:0;font-family:Fraunces,serif;font-size:22px;text-align:center}button.primary{height:42px;padding:0 18px;border:1px solid var(--accent);background:var(--accent);color:#fff;cursor:pointer;border-radius:0}.opening-name{margin:0 auto;padding:4px 12px;font-family:Fraunces,serif;font-size:13px;font-weight:600;color:var(--muted);text-align:center;background:#ffffff80;border-radius:999px;max-width:max-content}.tray{display:flex;flex-wrap:wrap;gap:2px;min-height:22px;margin:4px auto;padding:0 8px;font-size:18px;line-height:1;max-width:380px;width:100%;justify-content:center}.tray-piece{filter:drop-shadow(0 1px 0 rgba(0,0,0,.2))}@media(max-width:480px){.tray{display:none}}.board{--sq-light: #EFE6CF;--sq-dark: #A88766;--sq-light-hi: #F4E098;--sq-dark-hi: #C7A468;transition:transform .36s cubic-bezier(.4,0,.2,1)}.board.flipped,.board.flipped .sq{transform:rotate(180deg)}.sq.light{background:var(--sq-light)}.sq.dark{background:var(--sq-dark)}.sq.last-from{box-shadow:inset 0 0 0 4px var(--sq-light-hi)}.sq.last-to{box-shadow:inset 0 0 0 4px var(--sq-dark-hi)}.eyebrow{font-family:var(--font-mono);font-size:.7rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}.score-numeric,.move-count,.time-left{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:700;letter-spacing:-.018em;line-height:.95}.score-numeric.size-hero,.move-count.size-hero,.time-left.size-hero{font-size:clamp(2.8rem,9vw,5.6rem)}.score-numeric.size-card,.move-count.size-card,.time-left.size-card{font-size:clamp(1.6rem,4vw,2.4rem)}.score-numeric .unit,.move-count .unit,.time-left .unit{font-size:.45em;font-weight:600;color:var(--muted);vertical-align:.35em;margin-left:.2em}.game-code,.level-code{font-family:var(--font-mono);font-style:italic;font-weight:500;font-size:.78rem;letter-spacing:.08em;color:var(--accent, currentColor);text-transform:uppercase}.title-hero{font-family:var(--font-display);font-weight:700;letter-spacing:-.022em;font-size:clamp(2.4rem,7vw,4rem);line-height:.95}.title-hero em{font-style:italic;color:var(--accent, currentColor)}