*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0f1117;--surface:#1a1d27;--surface2:#22263a;--border:#2e3350;--text:#e8eaf6;--text-muted:#7c84a8;--accent:#5c6bc0;--accent-hover:#7986cb;--success:#43a047;--success-bg:#1b3a1c;--error:#e53935;--error-bg:#3b1212;--radius:12px}body{background:var(--bg);color:var(--text);height:100vh;font-family:system-ui,-apple-system,sans-serif;overflow:hidden}#root{flex-direction:column;height:100vh;display:flex}.app{flex-direction:column;height:100vh;display:flex;overflow:hidden}.app-header{text-align:center;border-bottom:1px solid var(--border);padding:2rem 1rem 1rem}.app-title{letter-spacing:-.5px;color:var(--text);font-size:2rem;font-weight:800}.app-subtitle{color:var(--text-muted);margin-top:.25rem;font-size:.95rem}.app-main{flex:1;justify-content:center;align-items:stretch;padding:1rem;display:flex;overflow:hidden}.game{flex-direction:column;gap:.75rem;width:100%;max-width:600px;display:flex;overflow-y:auto}.game-header{color:var(--text-muted);justify-content:space-between;align-items:center;font-size:.875rem;display:flex}.score-display{color:var(--text);font-weight:700}.diff-badge{text-transform:uppercase;letter-spacing:.08em;border:1px solid;border-radius:999px;padding:.2rem .6rem;font-size:.7rem;font-weight:700}.diff-easy{color:#81c784;background:#1b3a1c;border-color:#43a047}.diff-medium{color:#ffb74d;background:#3a2a0e;border-color:#fb8c00}.diff-hard{color:#ef9a9a;background:#3b1212;border-color:#e53935}.round-progress{flex-wrap:wrap;justify-content:center;gap:4px;display:flex}.round-dot{background:var(--surface2);border:1px solid 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.1s}.option-btn:hover:not(:disabled){background:var(--surface2);border-color:var(--accent);transform:translateY(-2px)}.option-btn:disabled{cursor:default}.option-btn.correct{background:var(--success-bg);border-color:var(--success);color:#81c784}.option-btn.wrong{background:var(--error-bg);border-color:var(--error);color:#ef9a9a}.option-btn.dimmed{opacity:.4}.answer-summary{color:var(--text-muted);flex-wrap:wrap;justify-content:center;align-items:center;gap:.5rem;font-size:.9rem;display:flex}.arrow{color:var(--border);font-size:1.2rem}.result-banner{border-radius:var(--radius);align-items:center;gap:1rem;padding:1rem 1.25rem;font-size:1.1rem;font-weight:700;display:flex}.result-banner.success{background:var(--success-bg);border:1px solid var(--success);color:#81c784}.result-banner.failure{background:var(--error-bg);border:1px solid var(--error);color:#ef9a9a}.result-icon{font-size:1.4rem}.result-text{flex:1}.next-btn{background:var(--accent);color:#fff;cursor:pointer;white-space:nowrap;border:none;border-radius:8px;padding:.5rem 1.25rem;font-size:.9rem;font-weight:700;transition:background .15s}.next-btn:hover{background:var(--accent-hover)}.score-screen{text-align:center;flex-direction:column;align-items:center;gap:1.5rem;width:100%;max-width:600px;padding:2rem 1rem;display:flex;overflow-y:auto}.score-title{color:var(--text-muted);text-transform:uppercase;letter-spacing:.1em;font-size:1.25rem;font-weight:700}.score-number{color:var(--text);font-size:5rem;font-weight:900;line-height:1}.score-sep{color:var(--text-muted);font-weight:300}.score-message{color:var(--text-muted);max-width:320px;font-size:1.1rem}.high-score{color:var(--text-muted);font-size:.95rem;font-weight:600}.replay-btn{background:var(--accent);color:#fff;border-radius:var(--radius);cursor:pointer;border:none;padding:.875rem 2.5rem;font-size:1.1rem;font-weight:700;transition:background .15s,transform .1s}.replay-btn:hover{background:var(--accent-hover);transform:translateY(-2px)}