:root{color-scheme:light dark;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.5;font-weight:400;color:#0f172a;background-color:#f8fafc;--brand: #2563eb;--brand-muted: #93c5fd;--danger: #dc2626;--success: #16a34a;--card-bg: rgba(255, 255, 255, .9);--border: #e2e8f0}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:linear-gradient(135deg,#e0f2fe,#eef2ff)}.app-shell{min-height:100vh;display:flex;flex-direction:column}.app-header{display:flex;align-items:center;justify-content:space-between;padding:1rem 2rem;background-color:#fff;border-bottom:1px solid var(--border);flex-wrap:wrap;gap:1rem}.brand{font-weight:700;font-size:1.2rem;text-decoration:none;color:var(--brand)}.nav-links{display:flex;gap:1rem}.nav-links a{text-decoration:none;color:#0f172a;font-weight:500;padding-bottom:.25rem;border-bottom:2px solid transparent}.nav-links a.active{border-color:var(--brand);color:var(--brand)}.header-actions{display:flex;align-items:center;gap:.75rem}.mobile-user-actions{display:none}.welcome{font-size:.9rem}.welcome.muted{color:#64748b}button{border:none;border-radius:999px;padding:.55rem 1.4rem;font-size:.95rem;font-weight:600;cursor:pointer;transition:transform .2s ease,opacity .2s ease}button.primary{background-color:var(--brand);color:#fff}button.secondary{background-color:#e0e7ff;color:#1e1b4b}button.danger{background-color:#fee2e2;color:#b91c1c;border:1px solid rgba(248,113,113,.4)}button.ghost{background-color:transparent;color:#0f172a;border:1px solid var(--border)}.linkish{border:none;padding:0;color:var(--brand);text-decoration:underline;border-radius:0;background:transparent}.icon-button{background:transparent;border:none;font-size:1.2rem;cursor:pointer;line-height:1;padding:0;margin-right:.3rem}button:disabled{cursor:not-allowed;opacity:.6}.app-main{flex:1;padding:2rem;max-width:1200px;width:100%;margin:0 auto}.app-footer{text-align:center;padding:1rem;color:#475569}.panel{background-color:var(--card-bg);border:1px solid var(--border);border-radius:1rem;padding:1.5rem;box-shadow:0 20px 35px #0f172a14}.panel>h2:first-child{margin-top:0;margin-bottom:1rem}.home-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem}.home-grid .panel.full-width{grid-column:1 / -1}.home-actions{display:flex;gap:1rem;flex-wrap:wrap;margin-top:1rem}.game-header{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;margin-bottom:1rem}.form-group{display:flex;flex-direction:column;gap:.25rem}form{display:flex;flex-direction:column;gap:1rem}input,select,textarea{border-radius:.75rem;border:1px solid var(--border);padding:.65rem .9rem;font-size:1rem;background-color:#fff;color:#0f172a}.new-game-controls{display:flex;flex-direction:column;gap:1rem}.panel.new-game-controls{margin-top:1.5rem}.new-game-controls:not(.panel){margin-top:1.25rem;padding-top:1rem;border-top:1px solid var(--border)}.error-text{color:var(--danger);font-size:.9rem}.success-text{color:var(--success);font-size:.9rem}.game-layout{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;align-items:start}.round-image-wrapper{width:100%;background-color:#0f172a;border-radius:1rem;padding:1rem;display:flex;align-items:center;justify-content:center}.round-image{max-width:100%;width:clamp(220px,40vw,360px);height:auto;border-radius:.75rem;object-fit:contain}.finished-status{font-size:1.5rem;font-weight:700;text-align:center;margin:0}.finished-status.negative{color:var(--danger)}.finished-status.positive{color:var(--success)}.choice-grid{display:grid;gap:.75rem}.choice-grid button{justify-self:stretch}.feedback-card{margin-top:1rem;padding:1rem;border-radius:.75rem;border:1px solid var(--border)}.feedback-card.success{border-color:#16a34a66;background-color:#16a34a1a}.feedback-card.error{border-color:#dc262666;background-color:#dc26261a}.leaderboard-tabs{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1rem}.leaderboard-tabs button{border-radius:999px;padding:.4rem 1rem;border:1px solid transparent}.leaderboard-tabs button.active{background-color:var(--brand);color:#fff}.player-stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1rem;margin-top:1rem}.stat-card{border:1px solid var(--border);border-radius:.75rem;padding:1rem;background-color:#fff;box-shadow:0 10px 20px #0f172a0d;display:flex;flex-direction:column;gap:.25rem}.stat-label{font-size:.85rem;color:#475569;text-transform:uppercase;letter-spacing:.05em}.table-wrapper{overflow-x:auto}table{width:100%;border-collapse:collapse}th,td{text-align:left;padding:.75rem;border-bottom:1px solid var(--border)}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background-color:#0f172a8c;display:flex;align-items:center;justify-content:center;padding:1.5rem;z-index:1000}.modal-card{background-color:#fff;border-radius:1rem;padding:2rem;max-width:420px;width:100%;box-shadow:0 25px 60px #0f172a40;display:flex;flex-direction:column;gap:1rem}.modal-actions{display:flex;gap:.75rem;flex-wrap:wrap}@media (max-width: 768px){.app-header{justify-content:center;position:relative}.nav-links{width:100%;justify-content:center}.app-main{padding:1.25rem}.brand{margin:0 auto}.mobile-user-actions{display:flex;align-items:center;gap:.15rem;position:absolute;right:1rem;top:1rem}.header-actions{display:none}.panel-compact{padding:.65rem 1rem}.game-header{margin-bottom:.4rem;gap:.5rem}}@media (min-width: 769px){.panel-compact{padding-top:.75rem}}