:root{--bg-color: #0c0c0c;--text-primary: #ededed;--text-secondary: #a0a0a0;--border-color: #272727;--accent: #2e2e2e;--input-bg: #141414;--input-border: #333333;--input-focus: #555555;--success: #44b556;--error: #ff5555}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Inter,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg-color);color:var(--text-primary);display:flex;justify-content:center;align-items:center;min-height:100vh;line-height:1.6}.container{width:100%;max-width:420px;padding:2.5rem;border:1px solid var(--border-color);border-radius:12px;background-color:#0f0f0f;box-shadow:0 8px 32px #0006}h1{font-size:1.5rem;font-weight:500;margin-bottom:.5rem;text-align:center;letter-spacing:-.02em}.subtitle{color:var(--text-secondary);font-size:.95rem;text-align:center;margin-bottom:2.5rem}.input-group{margin-bottom:1.5rem;display:flex;flex-direction:column}label{font-size:.8rem;color:var(--text-secondary);margin-bottom:.5rem;font-weight:500;text-transform:uppercase;letter-spacing:.05em}.input-wrapper{position:relative;display:flex;align-items:center}.currency-symbol{position:absolute;left:1rem;color:var(--text-secondary);font-weight:500;font-size:1.2rem}input[type=number]{width:100%;padding:.8rem 1rem .8rem 2.5rem;font-size:1.2rem;background-color:var(--input-bg);border:1px solid var(--input-border);border-radius:8px;color:var(--text-primary);outline:none;transition:all .2s ease}input[type=number]:focus{border-color:var(--input-focus);box-shadow:0 0 0 2px #5553}input[type=number]::-webkit-inner-spin-button,input[type=number]::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}input[type=number]{-moz-appearance:textfield}.error-message{color:var(--error);font-size:.85rem;margin-top:.5rem;min-height:1.2rem;transition:opacity .2s}#paypal-button-container{min-height:150px;margin-top:1rem}