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h3{margin-bottom:1rem;color:#1976d2}.upgrade-info{display:flex;flex-direction:column;gap:.5rem;font-size:.95rem}.upgrade-section{background:#fff;padding:2rem;border-radius:8px;border:1px solid #ddd}.upgrade-section h3{margin-bottom:1.5rem;color:#333}.requirements-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin-bottom:2rem}.requirement-card{background:#fafafa;padding:1.5rem;border-radius:8px;display:flex;flex-direction:column;gap:1rem}.requirement-label{font-size:.85rem;color:#666;text-transform:uppercase;letter-spacing:.05em;font-weight:600}.requirement-value{font-size:1.3rem;font-weight:700;color:#333}.costs-list{display:flex;flex-direction:column;gap:.5rem}.cost-item{display:flex;justify-content:space-between;align-items:center;font-size:1rem}.cost-item.affordable{color:#4caf50}.cost-item.unaffordable{color:#f44336}.current-amount{font-size:.9rem;color:#666}.income-increases{display:flex;flex-direction:column;gap:.5rem}.income-item{font-size:1rem;color:#4caf50;font-weight:500}.building-requirements{background:#fff3e0;padding:1.5rem;border-radius:8px;margin-bottom:2rem}.building-requirements h4{margin-bottom:1rem;color:#e65100}.building-requirements ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.5rem}.building-requirements li{font-size:.95rem;color:#666}.upgrade-button{width:100%;padding:1rem 2rem;font-size:1.1rem;font-weight:600;background:#4caf50;color:#fff;border:none;border-radius:8px;cursor:pointer;transition:background .2s}.upgrade-button:hover:not(:disabled){background:#45a049}.upgrade-button:disabled{background:#ccc;cursor:not-allowed}.max-level{background:#f5f5f5;padding:2rem;border-radius:8px;text-align:center}.max-level p{font-size:1.2rem;color:#666}.loading-card,.error-card{background-color:#0a0a0ad9;padding:3rem;border-radius:12px;text-align:center;font-size:1.1rem;margin:2rem auto;max-width:600px;box-shadow:0 8px 32px #000000b3;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.loading-card{border:2px solid rgba(212,175,55,.5);color:#d4af37}.error-card{border:2px solid rgba(139,0,0,.5);color:#ff6b6b}.building-detail-container{padding:2rem;max-width:800px;margin:0 auto;min-height:100%}.back-button{padding:.5rem 1rem;background:#d4af3733;color:#d4af37;border:1px solid rgba(212,175,55,.5);border-radius:4px;cursor:pointer;margin-bottom:2rem;font-size:1rem;transition:all .2s ease}.back-button:hover{background:#d4af374d;border-color:#d4af37}.building-detail-loading{text-align:center;padding:4rem;color:#999;font-size:1.2rem}.building-detail-content{background:#14141ecc;border:2px solid rgba(212,175,55,.3);border-radius:8px;padding:2rem}.building-detail-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;gap:1rem}.building-detail-title{font-size:2rem;color:#d4af37;margin:0}.building-detail-level{font-size:1.1rem;color:#999;white-space:nowrap}.building-detail-description{color:#ccc;font-size:1.1rem;line-height:1.6;margin-bottom:2rem;padding-bottom:2rem;border-bottom:1px solid rgba(212,175,55,.2)}.upgrade-section{display:flex;flex-direction:column;gap:1.5rem}.upgrade-section h2{color:#d4af37;font-size:1.5rem;margin:0}.upgrade-cost{display:flex;flex-direction:column;gap:.75rem;padding:1rem;background:#0000004d;border-radius:4px}.cost-label{color:#999;font-size:.9rem;text-transform:uppercase;letter-spacing:1px}.cost-values{display:flex;flex-wrap:wrap;gap:1.5rem}.cost-item{color:#fff;font-weight:500;font-size:1.1rem}.cost-item.insufficient{color:#ff6b6b}.upgrade-duration{color:#ccc;font-size:1rem;padding:.75rem;background:#0003;border-radius:4px}.upgrade-button{padding:1rem 2rem;background:linear-gradient(135deg,#d4af37,#c5a028);color:#1a1a2e;border:none;border-radius:4px;font-weight:600;font-size:1.1rem;cursor:pointer;transition:all .2s ease;text-transform:uppercase;letter-spacing:1px}.upgrade-button:hover:not(:disabled){background:linear-gradient(135deg,#e5c048,#d4af37);transform:translateY(-1px);box-shadow:0 4px 8px #d4af374d}.upgrade-button:active:not(:disabled){transform:translateY(0)}.upgrade-button:disabled{background:#64646480;color:#666;cursor:not-allowed;opacity:.6}.max-level-message{text-align:center;padding:2rem;color:#d4af37;font-size:1.3rem;font-weight:600;background:#d4af371a;border-radius:4px}@media(max-width:768px){.building-detail-container{padding:1rem}.building-detail-header{flex-direction:column;align-items:flex-start}.building-detail-title{font-size:1.5rem}}