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var(--border-color);border-radius:var(--border-radius-md);background:#fff;color:var(--text-dark);font-size:var(--font-size-sm);font-weight:500;font-family:var(--font-family);cursor:pointer;transition:var(--transition)}.amount-preset:hover{border-color:var(--primary-color);color:var(--primary-color)}.amount-preset.active{border-color:var(--text-dark);color:var(--text-dark);font-weight:600}.amount-custom-wrapper{display:flex;align-items:center;flex:1;min-width:180px;border:1px solid var(--border-color);border-radius:var(--border-radius-md);overflow:hidden;transition:border-color .2s ease,box-shadow .2s ease}.amount-custom-wrapper:focus-within{border-color:var(--primary-color);box-shadow:0 0 0 3px #f7931a26}.amount-currency{padding:var(--spacing-sm);background:var(--bg-light);color:var(--text-light);font-size:var(--font-size-sm);border-right:1px solid var(--border-color)}.amount-custom{flex:1;padding:var(--spacing-sm);border:none;font-size:var(--font-size-sm);font-family:var(--font-family);color:var(--text-dark);outline:none;-moz-appearance:textfield}.amount-custom::placeholder{color:var(--text-light)}.amount-custom::-webkit-outer-spin-button,.amount-custom::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.btn-donate-bitcoin{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);width:100%;padding:var(--spacing-md) var(--spacing-lg);margin-top:var(--spacing-xl);background:transparent;border:2px solid var(--primary-color);border-radius:var(--border-radius-lg);color:var(--primary-color);font-size:var(--font-size-base);font-weight:600;font-family:var(--font-family);cursor:pointer;transition:var(--transition)}.btn-donate-bitcoin:hover:not(:disabled){background:#f7931a14}.btn-donate-bitcoin:disabled{opacity:.4;cursor:not-allowed}.btn-donate-bitcoin svg{color:var(--primary-color);width:24px;height:24px}@media (max-width: 768px){.platinum-donors-grid{grid-template-columns:1fr;gap:var(--spacing-lg)}.platinum-donor-card{padding:var(--spacing-2xl) var(--spacing-lg);min-height:150px}.platinum-donor-logo{max-width:180px}.fund-header{flex-direction:column;align-items:center;text-align:center}.fund-icon{width:56px;height:56px}}@media (max-width: 480px){.donors{padding:var(--spacing-2xl) 0}.platinum-donor-card{padding:var(--spacing-xl) var(--spacing-md)}.platinum-donor-logo{max-width:150px}.fund-section{padding:var(--spacing-lg)}.fund-donors-logos{justify-content:center}.modal-content{padding:var(--spacing-lg)}.amount-options{flex-direction:column;align-items:stretch}.amount-custom-wrapper{min-width:unset}}