:root{--brand-primary:#0e6f56;--brand-primary-soft:#14876a;--brand-accent:#2fce9f;--brand-accent-soft:#acf0d18c;--brand-mint:#acf0d1;--brand-gold:#ffb200;--brand-sky:#7dcdf4;--paper:#eefaf4;--ink:#1f2a26;--cell-bg:#ffffffeb;--cell-border:#cfe8dc;--wrong:#e05a4e;--radius:16px;--shadow:0 4px 14px #0e6f5629}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body,#root{height:100%;margin:0}body{background:var(--paper);color:var(--ink);overscroll-behavior:none;touch-action:manipulation;-webkit-user-select:none;user-select:none;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}button{font:inherit;cursor:pointer;color:inherit;background:0 0;border:none}.picker{background:linear-gradient(180deg, var(--brand-primary) 0%, var(--brand-primary-soft) 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#e0d3a4}.teacher-empty{opacity:.6}.teacher-note{opacity:.6;margin:0;font-size:.88rem}.game{height:100%;padding:max(8px, env(safe-area-inset-top)) 12px max(8px, env(safe-area-inset-bottom));flex-direction:column;gap:10px;max-width:1100px;margin:0 auto;display:flex}.game-bg{z-index:-1;background-position:bottom;background-size:cover;position:fixed;inset:0}.game-bg:after{content:"";background:linear-gradient(#eefaf44d,#eefaf424);position:absolute;inset:0}.hud{align-items:center;gap:12px;padding:8px 4px 0;display:flex}.hud-back{background:var(--brand-primary);color:#fff;width:56px;height:56px;box-shadow:var(--shadow);border-radius:50%;place-items:center;font-size:1.6rem;display:grid}.hud-centre{box-shadow:var(--shadow);background:#ffffffd1;border-radius:16px;flex-direction:column;flex:1;align-items:center;padding:4px 16px;display:flex}.hud-target{font-size:clamp(1.3rem,3.4vw,1.9rem)}.hud-target strong{color:var(--brand-primary);background:var(--brand-accent-soft);border-radius:12px;padding:0 10px;font-size:1.35em;display:inline-block}.hud-round{width:48px;height:48px;color:var(--brand-primary);box-shadow:var(--shadow);background:#fff;border-radius:50%;place-items:center;font-size:1.25rem;font-weight:800;display:grid}.hud-round:active{transform:scale(.92)}.hud-shake{animation:.4s shake}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-6px)}50%{transform:translate(6px)}75%{transform:translate(-3px)}}.hud-progress{opacity:.65;font-size:.85rem}.hud-timer{text-align:center;font-variant-numeric:tabular-nums;min-width:76px;color:var(--brand-primary);box-shadow:var(--shadow);background:#fff;border-radius:12px;padding:8px 10px;font-size:1.4rem;font-weight:700}.board{grid-template-columns:repeat(var(--cols,10), 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