:root{--bg: #0f0f1a;--surface: #1a1a2e;--surface-2: #16213e;--accent: #7c3aed;--accent-light: #a78bfa;--accent-glow: rgba(124, 58, 237, .35);--gold: #fbbf24;--gold-glow: rgba(251, 191, 36, .3);--text: #f1f5f9;--text-muted: #94a3b8;--success: #34d399;--error: #f87171;--border: rgba(148, 163, 184, .12);--radius-sm: 12px;--radius-md: 20px;--radius-lg: 32px;--font: "Outfit", sans-serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{width:100%;height:100%;overflow:hidden;background:var(--bg);color:var(--text);font-family:var(--font);-webkit-tap-highlight-color:transparent;-webkit-font-smoothing:antialiased}#app{width:100%;height:100dvh;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.screen{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px 20px;padding-bottom:calc(24px + env(safe-area-inset-bottom,0px));opacity:0;transform:translateY(16px);transition:opacity .35s ease,transform .35s ease;pointer-events:none;overflow-y:auto}.screen.active{opacity:1;transform:translateY(0);pointer-events:all}#app:before{content:"";position:fixed;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse 60% 50% at 50% 0%,rgba(124,58,237,.18) 0%,transparent 70%),radial-gradient(ellipse 40% 30% at 80% 80%,rgba(99,102,241,.12) 0%,transparent 60%);pointer-events:none}.logo{font-size:clamp(2rem,6vw,2.8rem);font-weight:900;background:linear-gradient(135deg,var(--accent-light) 0%,#c4b5fd 50%,var(--gold) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:-.02em;text-align:center;margin-bottom:6px}.logo-sub{font-size:.9rem;color:var(--text-muted);text-align:center;margin-bottom:40px;font-weight:400}.mode-wrap{display:flex;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:4px;width:100%;max-width:320px;margin-bottom:20px}.mode-btn{flex:1;background:transparent;border:none;border-radius:calc(var(--radius-md) - 4px);color:var(--text-muted);font-family:var(--font);font-size:.95rem;font-weight:600;padding:12px;cursor:pointer;transition:all .2s ease}.mode-btn.selected{background:linear-gradient(135deg,var(--accent),#6d28d9);color:#fff;box-shadow:0 4px 16px var(--accent-glow)}.count-label{font-size:.8rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);margin-bottom:14px}.count-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;width:100%;max-width:320px;margin-bottom:32px}.count-btn{background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius-md);color:var(--text);font-family:var(--font);font-size:1.05rem;font-weight:600;padding:18px 12px;cursor:pointer;transition:all .2s ease;position:relative;overflow:hidden}.count-btn:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(135deg,var(--accent),#6d28d9);opacity:0;transition:opacity .2s}.count-btn span{position:relative;z-index:1}.count-btn .sub{display:block;font-size:.72rem;font-weight:400;color:var(--text-muted);margin-top:2px}.count-btn.selected:before{opacity:1}.count-btn.selected .sub{color:#ffffffb3}.count-btn.selected{border-color:var(--accent);box-shadow:0 0 24px var(--accent-glow),inset 0 0 0 1px var(--accent)}.count-btn:hover:not(.selected){border-color:#a78bfa66;background:#a78bfa0f;transform:translateY(-1px)}.btn-primary{width:100%;max-width:320px;padding:18px;background:linear-gradient(135deg,var(--accent) 0%,#6d28d9 100%);border:none;border-radius:var(--radius-md);color:#fff;font-family:var(--font);font-size:1.1rem;font-weight:700;letter-spacing:.02em;cursor:pointer;transition:all .2s ease;box-shadow:0 8px 32px var(--accent-glow);position:relative;overflow:hidden}.btn-primary:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(135deg,rgba(255,255,255,.15),transparent)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 40px var(--accent-glow)}.btn-primary:active{transform:translateY(0)}.btn-primary:disabled{opacity:.4;cursor:not-allowed;transform:none}.btn-secondary{background:transparent;border:1.5px solid var(--border);border-radius:var(--radius-md);color:var(--text-muted);font-family:var(--font);font-size:.95rem;font-weight:600;padding:14px 24px;cursor:pointer;transition:all .2s ease}.btn-secondary:hover{border-color:#a78bfa66;color:var(--accent-light)}.countdown-number{font-size:clamp(6rem,25vw,10rem);font-weight:900;background:linear-gradient(135deg,var(--accent-light),#c4b5fd);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1;animation:pulse-scale 1s ease-in-out}@keyframes pulse-scale{0%{transform:scale(1.3);opacity:0}40%{transform:scale(.95);opacity:1}70%{transform:scale(1.03)}to{transform:scale(1)}}.countdown-label{font-size:.9rem;color:var(--text-muted);margin-top:16px;font-weight:400}.game-header{display:flex;align-items:center;justify-content:space-between;width:100%;max-width:360px;margin-bottom:auto}.game-progress{font-size:.82rem;color:var(--text-muted);font-weight:600}.game-timer{font-size:.82rem;color:var(--accent-light);font-weight:700;font-variant-numeric:tabular-nums}.progress-bar-wrap{width:100%;max-width:360px;height:3px;background:var(--border);border-radius:99px;margin-bottom:12px;overflow:hidden}.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent-light));border-radius:99px;transition:width .3s ease}.question-card{display:flex;flex-direction:column;align-items:center;justify-content:center;flex:1;gap:4px}.question-text{font-size:clamp(4rem,20vw,7rem);font-weight:900;color:var(--text);line-height:1.1;text-align:center;letter-spacing:-.02em}.question-eq{font-size:clamp(2rem,10vw,3.5rem);font-weight:700;color:var(--text-muted);line-height:1.4;text-align:center}.answer-display{font-size:clamp(4rem,20vw,7rem);font-weight:900;color:var(--accent-light);line-height:1.1;text-align:center;min-height:1.1em;letter-spacing:-.02em;border-bottom:4px solid var(--accent);padding-bottom:6px;min-width:140px;transition:color .15s}.answer-display.empty{color:#a78bfa33;border-bottom-color:var(--border)}.numpad{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;width:100%;max-width:320px;margin-top:auto;padding-bottom:env(safe-area-inset-bottom,8px)}.numpad-btn{aspect-ratio:1.4;background:var(--surface);border:1.5px solid var(--border);border-radius:var(--radius-sm);color:var(--text);font-family:var(--font);font-size:1.5rem;font-weight:700;cursor:pointer;transition:all .12s ease;display:flex;align-items:center;justify-content:center;-webkit-tap-highlight-color:transparent;touch-action:manipulation;-webkit-user-select:none;user-select:none}.numpad-btn:active{transform:scale(.92);background:var(--accent);border-color:var(--accent);box-shadow:0 0 20px var(--accent-glow)}.numpad-btn.delete{font-size:1.2rem;color:var(--text-muted)}.numpad-btn.submit{background:linear-gradient(135deg,var(--accent),#6d28d9);border-color:var(--accent);font-size:1rem;color:#fff;box-shadow:0 4px 16px var(--accent-glow)}.numpad-btn.submit:active{background:#6d28d9}.result-title{font-size:1.8rem;font-weight:900;color:var(--text);margin-bottom:4px;text-align:center}.result-emoji{font-size:3rem;margin-bottom:8px}.stats-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;width:100%;max-width:340px;margin:20px 0 24px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:16px 12px;text-align:center}.stat-value{font-size:1.6rem;font-weight:800;color:var(--accent-light);line-height:1;margin-bottom:4px}.stat-label{font-size:.72rem;color:var(--text-muted);font-weight:500;letter-spacing:.05em;text-transform:uppercase}.result-actions{display:flex;flex-direction:column;gap:10px;width:100%;max-width:320px}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100;display:flex;align-items:flex-end;justify-content:center;opacity:0;transition:opacity .25s ease;pointer-events:none}.modal-overlay.open{opacity:1;pointer-events:all}.modal-sheet{background:var(--surface-2);border-radius:var(--radius-lg) var(--radius-lg) 0 0;border:1px solid var(--border);border-bottom:none;width:100%;max-width:480px;max-height:70dvh;padding:28px 20px;padding-bottom:calc(28px + env(safe-area-inset-bottom,0px));transform:translateY(100%);transition:transform .3s cubic-bezier(.32,.72,0,1);overflow-y:auto}.modal-overlay.open .modal-sheet{transform:translateY(0)}.modal-handle{width:40px;height:4px;background:var(--border);border-radius:99px;margin:0 auto 20px}.modal-title{font-size:1.1rem;font-weight:700;margin-bottom:16px;color:var(--text)}.wrong-list{display:flex;flex-direction:column;gap:8px}.wrong-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;display:flex;align-items:center;justify-content:space-between}.wrong-question{font-size:1rem;font-weight:600;color:var(--text)}.wrong-answer-wrap{display:flex;align-items:center;gap:8px}.wrong-yours{font-size:.9rem;color:var(--error);font-weight:600;text-decoration:line-through}.wrong-correct{font-size:.9rem;color:var(--success);font-weight:700}.modal-close{margin-top:20px;width:100%}.leaderboard-section{width:100%;max-width:340px;margin-top:4px}.leaderboard-title{font-size:.78rem;font-weight:700;letter-spacing:.1em;color:var(--text-muted);text-transform:uppercase;margin-bottom:10px;display:flex;align-items:center;gap:6px}.leaderboard-title:before{content:"🏆";font-size:.9rem}.lb-tabs{display:flex;gap:8px;margin-bottom:12px}.lb-tab{flex:1;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text-muted);font-family:var(--font);font-size:.85rem;font-weight:600;padding:8px 12px;cursor:pointer;transition:all .2s;text-align:center}.lb-tab.active{background:#7c3aed33;border-color:var(--accent);color:var(--accent-light)}.leaderboard-list{display:flex;flex-direction:column;gap:6px;max-height:180px;overflow-y:auto}.leaderboard-item{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 14px;display:flex;align-items:center;justify-content:space-between;font-size:.82rem}.leaderboard-item.gold{border-color:#fbbf2459;background:#fbbf240f}.lb-rank{font-weight:800;color:var(--text-muted);min-width:20px}.leaderboard-item.gold .lb-rank{color:var(--gold)}.lb-date{color:var(--text-muted);font-weight:400;flex:1;margin:0 8px}.lb-stat{font-weight:700;color:var(--accent-light)}