:root{--bg:#ffffff;--panel:#f6f8fb;--panel-2:#e9eef5;--ink:#0f1320;--muted:#6c7686;--line:#d9e2ef;--brand:#0aa770;--brand-2:#33c3ff;--good:#16b369;--bad:#e64b4b;--warn:#ffd400;--radius-lg:18px;--radius-md:12px;--radius-sm:8px;--shadow-card:0 24px 60px rgba(15,19,32,.08);--shadow-soft:0 8px 24px rgba(15,19,32,.06);--safe-top:env(safe-area-inset-top,0px);--safe-bottom:env(safe-area-inset-bottom,0px);--header-h:56px;--gap:10px;--grid-gap:10px}*{box-sizing:border-box;-webkit-tap-highlight-color:#fff0}html,body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,system-ui,Segoe UI,Roboto,Arial,sans-serif;line-height:1.4;min-height:100%}body{min-height:100dvh;display:flex;flex-direction:column}.site-header{position:sticky;top:0;z-index:100;height:var(--header-h);padding:0 16px;padding-top:calc(var(--safe-top));background:var(--bg);border-bottom:1px solid var(--line);box-shadow:0 10px 30px rgb(15 19 32 / .04);display:flex;align-items:center;justify-content:center;font-weight:700;letter-spacing:-.03em;user-select:none}.brand-link{background:linear-gradient(135deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:#fff0;text-decoration:none;font-size:clamp(16px,2vw,18px);display:flex;align-items:center;gap:6px;font-weight:800}.brand-dot{width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand-2));box-shadow:0 0 12px rgb(51 195 255 / .6)}.main-wrap{flex:1;display:flex;flex-direction:column;align-items:center;padding:16px;padding-bottom:calc(16px + var(--safe-bottom));gap:16px;max-width:1400px;width:100%;margin:0 auto}.game-shell{width:100%;display:grid;grid-template-columns:1fr;gap:16px}@media(min-width:900px){.game-shell{grid-template-columns:minmax(260px,320px) 1fr;align-items:start}}.control-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);padding:16px 16px 20px;display:flex;flex-direction:column;gap:16px}.card-headline{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-start;gap:8px}.card-title h1{margin:0;font-size:1rem;font-weight:800;color:var(--ink);display:flex;align-items:center;gap:8px}.mode-badge{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-size:.7rem;font-weight:600;line-height:1;padding:6px 8px;border-radius:var(--radius-sm);min-width:48px;text-align:center}.card-desc{font-size:.8rem;color:var(--muted);line-height:1.4}.live-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(90px,1fr));gap:10px;width:100%}.stat-box{background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);box-shadow:var(--shadow-soft);padding:10px 12px;min-height:64px;display:flex;flex-direction:column;justify-content:center}.stat-label{font-size:.7rem;font-weight:600;color:var(--muted);line-height:1.2;display:flex;align-items:center;gap:4px}.stat-value{font-weight:700;font-size:1rem;color:var(--ink);line-height:1.3;word-spacing:-1px;margin-top:4px;font-variant-numeric:tabular-nums}.mode-select{display:flex;flex-wrap:wrap;gap:8px}.mode-btn{appearance:none;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:var(--radius-md);padding:10px 14px;font-weight:600;font-size:.8rem;line-height:1.2;cursor:pointer;min-width:70px;box-shadow:var(--shadow-soft);transition:all .15s ease}.mode-btn.active{border:none;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 16px 40px rgb(10 167 112 / .35)}.mode-btn:active{transform:scale(.97)}.play-btn{appearance:none;border:0;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-weight:700;font-size:.9rem;line-height:1.2;padding:12px 16px;border-radius:var(--radius-md);cursor:pointer;box-shadow:0 20px 40px rgb(51 195 255 / .4);transition:transform .12s ease;width:100%;text-align:center}.play-btn:active{transform:scale(.97)}.small-note{font-size:.7rem;color:var(--muted);line-height:1.4}.small-note strong{color:var(--ink);font-weight:600}.board-wrap{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow-card);padding:16px;width:100%;max-width:700px;margin:0 auto;display:flex;flex-direction:column;align-items:center;gap:16px}.grid{width:100%;max-width:560px;aspect-ratio:1/1;background:var(--panel-2);border-radius:var(--radius-md);border:1px solid var(--line);padding:var(--grid-gap);display:grid;grid-template-columns:repeat(5,1fr);grid-auto-rows:1fr;gap:var(--grid-gap);box-shadow:inset 0 0 20px rgb(15 19 32 / .05)}.cell{appearance:none;display:grid;place-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius-md);font-weight:700;font-size:clamp(18px,3vw,28px);color:var(--ink);cursor:pointer;transition:transform .08s ease,background .15s ease,box-shadow .15s ease;box-shadow:0 8px 20px rgb(15 19 32 / .06)}.cell.empty{opacity:.25;cursor:default}.cell:active{transform:scale(.97)}.cell.correct{animation:pop .14s ease;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;border:none;box-shadow:0 16px 40px rgb(10 167 112 / .35)}@keyframes pop{from{transform:scale(.92)}to{transform:scale(1)}}button:focus-visible,a:focus-visible{outline:3px solid rgb(51 195 255 / .35);outline-offset:2px;border-radius:var(--radius-md)}.sr-only{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}.result-text{font-size:.8rem;color:var(--muted);text-align:center;min-height:1.2em}.result-text strong{color:var(--ink);font-weight:700;font-variant-numeric:tabular-nums}@media(min-width:1200px){.main-wrap{padding-top:24px;padding-bottom:24px}}