:root{--navy:#1b2b4b;--teal:#2ec4b6;--bg:#fff;--card:#f7f8fa;--border:#e2e8f0;--text:#1b2b4b;--muted:#64748b}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif}#root{min-height:100%}h1,h2,h3{color:var(--navy);margin:0 0 12px}button{cursor:pointer;background:var(--teal);color:#08312d;border:none;border-radius:8px;padding:10px 16px;font-size:14px;font-weight:600}button:disabled{opacity:.45;cursor:default}select{border:1px solid var(--border);border-radius:6px;margin-bottom:16px;padding:6px 10px;font-size:14px}.screen{max-width:480px;margin:0 auto;padding:20px}.link-btn{color:var(--muted);background:0 0;margin-bottom:12px;padding:0;font-size:13px}.brand-list{flex-direction:column;gap:10px;display:flex}.brand-card{background:var(--card);border:1px solid var(--border);cursor:pointer;border-radius:10px;padding:14px 16px;transition:border-color .15s}.brand-card:hover{border-color:var(--teal)}.brand-name{color:var(--navy);font-weight:700}.brand-offer{color:var(--muted);margin-top:4px;font-size:13px}.empty{color:var(--muted);padding:20px 0;font-size:14px}.tiers{gap:8px;margin:12px 0;display:flex}.tier{background:var(--card);border:1px solid var(--border);text-align:center;color:var(--muted);border-radius:8px;flex:1;padding:8px;font-size:12px}.tier b{color:var(--navy);font-size:18px;display:block}.tier.ready{border-color:var(--teal);background:#2ec4b61a}.cooldown-banner{color:#9a3412;background:#fff7ed;border:1px solid #fed7aa;border-radius:8px;margin-bottom:12px;padding:10px 12px;font-size:13px}.game-list{flex-direction:column;gap:8px;display:flex}.error-text{color:#c0392b;margin-top:10px;font-size:13px}.error-screen{text-align:center;color:#c0392b}.timer-bar{background:var(--border);border-radius:2px;height:4px;margin-bottom:16px;overflow:hidden}.timer-fill{background:var(--teal);height:100%;transition:width 1s linear}.quiz-question{margin-bottom:16px;font-size:16px}.options{flex-direction:column;gap:8px;display:flex}.options button{background:var(--card);color:var(--navy);border:1px solid var(--border);text-align:left}.options button:hover:not(:disabled){border-color:var(--teal)}.memory-grid{gap:8px;margin-top:12px;display:grid}.memory-card{aspect-ratio:1;background:var(--navy);cursor:pointer;color:#0000;-webkit-user-select:none;user-select:none;border-radius:8px;justify-content:center;align-items:center;font-size:28px;display:flex}.memory-card.open{background:var(--card);border:1px solid var(--teal);color:inherit}.puzzle-grid{gap:6px;margin-top:12px;display:grid}.puzzle-piece{aspect-ratio:1;background:var(--card);border:1px solid var(--border);color:var(--navy);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;font-size:20px;font-weight:700;display:flex}.puzzle-piece.selected{border-color:var(--teal);background:#2ec4b626}.result{text-align:center;padding-top:40px}