[data-sum-target-root]{color-scheme:dark;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.4;font-weight:500;--color-bg:#0f172a;--color-surface:#111c34;--color-surface-soft:#0b1224;--color-border:rgba(148,163,184,0.24);--color-text:#f8fafc;--color-muted:rgba(226,232,240,0.76);--color-accent:#22d3ee;--color-danger:#f87171;--color-success:#34d399;--surface-raised:rgba(15,23,42,0.36);--surface-card:rgba(15,23,42,0.38);--surface-subtle:rgba(15,23,42,0.48);--surface-interactive:rgba(15,23,42,0.6);--surface-overlay:rgba(15,23,42,0.88);--surface-timer-bg:rgba(34,197,247,0.12);--surface-timer-border:rgba(34,197,247,0.24);--shadow-elevated:0 20px 40px rgba(15,23,42,0.28);--shadow-overlay:0 18px 38px rgba(15,23,42,0.42);--border-strong:rgba(148,163,184,0.32);box-sizing:border-box;color:var(--color-text);width:100%;max-width:960px}[data-sum-target-root][data-theme=light]{color-scheme:light;--color-bg:#f5f7fb;--color-surface:#ffffff;--color-surface-soft:#ecf3ff;--color-border:rgba(15,23,42,0.1);--color-text:#0f172a;--color-muted:rgba(71,85,105,0.72);--color-accent:#0284c7;--color-danger:#ef4444;--color-success:#15803d;--surface-raised:rgba(148,163,184,0.18);--surface-card:rgba(255,255,255,0.96);--surface-subtle:rgba(236,242,255,0.92);--surface-interactive:rgba(231,238,254,0.96);--surface-overlay:rgba(255,255,255,0.98);--surface-timer-bg:rgba(2,132,199,0.1);--surface-timer-border:rgba(2,132,199,0.18);--shadow-elevated:0 12px 26px rgba(15,23,42,0.12);--shadow-overlay:0 22px 40px rgba(15,23,42,0.18);--border-strong:rgba(148,163,184,0.35)}[data-sum-target-root] *{box-sizing:inherit}.sum-target-shell{margin:0 auto;width:100%;display:flex;align-items:center;justify-content:center;padding:24px;background:transparent}[data-sum-target-root] button{font:inherit}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}.sum-target-app{display:flex;flex-direction:column;gap:20px;background:linear-gradient(155deg,var(--color-surface),var(--color-surface-soft));border:1px solid var(--color-border);border-radius:20px;padding:28px 32px;box-shadow:var(--shadow-elevated)}.app-header{display:grid;grid-template-columns:1fr auto;grid-gap:12px 24px;gap:12px 24px;padding:20px 24px;background:var(--surface-card);border-radius:16px;border:1px solid var(--border-strong);box-shadow:inset 0 1px 0 rgba(255,255,255,.06)}[data-sum-target-root][data-theme=light] .app-header{box-shadow:0 12px 22px rgba(15,23,42,.08)}.app-meta{gap:12px}.app-meta,.app-title{display:flex;align-items:center}.app-title{gap:10px;font-size:1.7rem;font-weight:700;letter-spacing:.02em}.title-icon{font-size:1.9rem}.tagline{margin:0;grid-column:1/-1;font-size:.95rem;color:var(--color-muted)}.header-actions{grid-column:2;grid-row:1;justify-self:end;align-self:start;display:flex;align-items:center;gap:10px}.theme-toggle{background:var(--surface-subtle);color:var(--color-text);border:1px solid var(--border-strong);border-radius:999px;padding:6px 14px;cursor:pointer;transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease;box-shadow:0 10px 18px rgba(15,23,42,.2)}.theme-toggle:hover{border-color:var(--color-accent);transform:translateY(-1px);box-shadow:0 12px 26px rgba(34,211,238,.25)}.btn-icon{font-size:1.1rem}.scoreboard{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-gap:12px;gap:12px;background:var(--surface-raised);border-radius:14px;padding:16px 18px;border:1px solid var(--border-strong)}.score-item{display:flex;flex-direction:column;gap:4px;padding:4px 6px}.score-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--color-muted)}.score-value{font-size:1.2rem;font-weight:700;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.sum-target-timer{display:flex;flex-direction:column;gap:14px;background:var(--surface-timer-bg);border:1px solid var(--surface-timer-border);border-radius:14px;padding:18px 20px}.sum-target-timer__label{display:flex;justify-content:space-between;align-items:center;gap:16px}.sum-target-timer__title{font-size:.75rem;text-transform:uppercase;letter-spacing:.14em;color:var(--color-muted);font-weight:600}.sum-target-timer__remaining{display:inline-flex;align-items:baseline;justify-content:flex-end;gap:6px;padding:6px 12px;min-width:72px;border-radius:12px;border:1px solid var(--surface-timer-border);background:var(--surface-card);box-shadow:0 14px 28px rgba(34,211,238,.12);color:var(--color-text);font-weight:700;font-size:1.7rem;line-height:1.05;font-feature-settings:"tnum";font-variant-numeric:tabular-nums;white-space:nowrap}[data-sum-target-root][data-theme=light] .sum-target-timer__remaining{box-shadow:0 12px 24px rgba(2,132,199,.16)}.sum-target-timer__remaining-value{display:inline-flex}.sum-target-timer__remaining-unit{font-size:.75rem;text-transform:uppercase;letter-spacing:.18em;color:var(--color-muted);font-weight:600}.sum-target-timer__bar{position:relative;height:10px;background:rgba(148,163,184,.2);border-radius:999px;overflow:hidden}.sum-target-timer__fill{position:absolute;top:0;left:0;bottom:0;background:var(--color-accent);border-radius:999px;box-shadow:0 0 16px rgba(34,211,238,.5);transition:width 1s linear}.target-card{background:var(--surface-card);border-radius:16px;padding:20px 22px;display:flex;flex-direction:column;gap:14px;border:1px solid var(--border-strong)}.target-header{display:flex;justify-content:space-between;align-items:baseline}.target-label{font-size:.85rem;color:var(--color-muted);text-transform:uppercase;letter-spacing:.08em}.target-value{font-size:2rem;font-weight:700}.expression-preview{background:var(--surface-subtle);border-radius:12px;padding:12px 16px;display:flex;justify-content:space-between;align-items:center;gap:12px;border:1px solid transparent}.expression-preview--error{border-color:var(--color-danger)}.expression-label{font-size:.8rem;color:var(--color-muted);text-transform:uppercase;letter-spacing:.08em}.expression-value{font-size:1.15rem;font-weight:600;word-break:break-word}.feedback{font-size:.9rem;padding:12px 14px;border-radius:12px;background:var(--surface-raised);border:1px solid var(--border-strong)}.feedback[data-tone=success]{background:rgba(52,211,153,.16);border-color:rgba(52,211,153,.32);color:var(--color-success)}.feedback[data-tone=warning]{background:rgba(248,113,113,.16);border-color:rgba(248,113,113,.28);color:var(--color-danger)}.tiles-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(72px,1fr));grid-gap:14px;gap:14px}.tile{background:var(--surface-interactive);color:var(--color-text);border:1px solid var(--border-strong);border-radius:14px;padding:18px 0;font-size:1.45rem;font-weight:700;cursor:pointer;transition:transform .12s ease,border-color .12s ease,box-shadow .12s ease,background .12s ease;box-shadow:0 12px 26px rgba(15,23,42,.24)}[data-sum-target-root][data-theme=light] .tile{box-shadow:0 10px 20px rgba(15,23,42,.12)}.tile:hover:not(.tile--disabled){transform:translateY(-2px);border-color:var(--color-accent);box-shadow:0 16px 32px rgba(34,211,238,.25)}.tile--disabled{cursor:not-allowed;opacity:.45;box-shadow:none}.operators{display:flex;gap:12px;justify-content:center}.operator{width:56px;height:56px;border-radius:12px;border:1px solid var(--border-strong);background:var(--surface-interactive);color:var(--color-text);font-size:1.4rem;cursor:pointer;transition:transform .12s ease,border-color .12s ease,box-shadow .12s ease;box-shadow:0 10px 22px rgba(15,23,42,.22)}[data-sum-target-root][data-theme=light] .operator{box-shadow:0 10px 18px rgba(15,23,42,.12)}.operator:hover:not(.operator--disabled){transform:translateY(-2px);border-color:var(--color-accent);box-shadow:0 14px 26px rgba(34,211,238,.25)}.operator--disabled{opacity:.45;cursor:not-allowed;box-shadow:none}.controls{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}.control-btn{padding:12px 22px;border-radius:12px;border:1px solid var(--border-strong);background:var(--surface-interactive);color:var(--color-text);cursor:pointer;font-weight:600;transition:transform .12s ease,border-color .12s ease,box-shadow .12s ease,background .12s ease;box-shadow:0 12px 24px rgba(15,23,42,.2)}[data-sum-target-root][data-theme=light] .control-btn{box-shadow:0 10px 20px rgba(15,23,42,.12)}.control-btn:disabled{opacity:.5;cursor:not-allowed;transform:none;box-shadow:none}.control-btn:hover:not(:disabled){transform:translateY(-2px);border-color:var(--color-accent);box-shadow:0 16px 32px rgba(34,211,238,.25)}.control-btn--primary{background:linear-gradient(135deg,var(--color-accent),rgba(34,211,238,.85));border:none;color:#f8fafc}.control-btn--primary:hover:not(:disabled){box-shadow:0 18px 34px rgba(34,211,238,.35)}.overlay-card{background:var(--surface-overlay);border-radius:16px;padding:22px;display:flex;flex-direction:column;gap:14px;text-align:center;border:1px solid var(--border-strong);box-shadow:var(--shadow-overlay)}.overlay-card.success{border-color:rgba(52,211,153,.32)}.overlay-card.game-over{border-color:rgba(248,113,113,.32)}.overlay-card.start{border-color:rgba(34,211,238,.32)}.overlay-card h2{margin:0;font-size:1.6rem}.overlay-card p{margin:0;color:var(--color-muted)}.app-footer{margin-top:4px;font-size:.85rem;color:var(--color-muted);text-align:center}@media (max-width:720px){.sum-target-shell{padding:16px}.sum-target-app{padding:24px 20px;gap:16px}.app-header{grid-template-columns:1fr;padding:18px 20px}.header-actions{grid-column:1;grid-row:auto;justify-self:start}.scoreboard{grid-template-columns:repeat(2,minmax(0,1fr))}.sum-target-timer__remaining{font-size:1.45rem;min-width:64px}}