*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--primary: #4f6ef7;--primary-dark: #3b5de7;--success: #22c55e;--error: #ef4444;--bg: #f0f2f8;--card-bg: #ffffff;--text: #1a1a2e;--text-secondary: #6b7280;--border: #e5e7eb;--radius: 16px;--radius-sm: 12px}body{font-family:Inter,system-ui,-apple-system,sans-serif;min-height:100dvh;display:flex;align-items:center;justify-content:center;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}#app{width:100%;max-width:420px;min-height:100dvh;display:flex;flex-direction:column}.screen{flex:1;display:flex;flex-direction:column;align-items:center;padding:1.5rem}.spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-screen{justify-content:center;gap:1rem}.loading-screen p{color:var(--text-secondary);font-size:.875rem}.tip-header{width:100%;text-align:center;padding:.75rem 0 1rem}.header-title{font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--text-secondary)}.recipient-card{display:flex;flex-direction:column;align-items:center;padding:1.5rem 1rem;background:var(--card-bg);border-radius:var(--radius);width:100%;box-shadow:0 1px 3px #0000000f}.avatar{width:80px;height:80px;border-radius:50%;object-fit:cover;margin-bottom:.75rem}.avatar-placeholder{display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;font-size:2rem;font-weight:600}.recipient-name{font-size:1.25rem;font-weight:700}.recipient-desc{font-size:.8rem;color:var(--text-secondary);margin-top:.25rem}.qr-label{font-size:.75rem;color:var(--primary);font-weight:500;margin-top:.5rem;font-style:italic}.amount-display{display:flex;align-items:baseline;justify-content:center;gap:.5rem;padding:1.5rem 0 1rem}.amount-value{font-size:3rem;font-weight:700;line-height:1}.amount-currency{font-size:1.25rem;font-weight:500;color:var(--text-secondary)}.preset-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.625rem;width:100%}.preset-btn{padding:.75rem;border:2px solid var(--border);border-radius:var(--radius-sm);background:var(--card-bg);font-size:1rem;font-weight:600;color:var(--text);cursor:pointer;transition:all .15s ease;font-family:inherit}.preset-btn:hover{border-color:var(--primary);color:var(--primary)}.preset-btn.active{background:var(--primary);border-color:var(--primary);color:#fff}.custom-amount-section{width:100%;margin-top:1rem;display:flex;flex-direction:column;gap:.375rem}.custom-amount-input{width:100%;padding:.75rem 1rem;border:2px solid var(--border);border-radius:var(--radius-sm);font-size:1rem;font-family:inherit;text-align:center;color:var(--text);background:var(--card-bg);transition:border-color .15s;-moz-appearance:textfield}.custom-amount-input::-webkit-inner-spin-button,.custom-amount-input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.custom-amount-input:focus{outline:none;border-color:var(--primary)}.amount-hint{font-size:.75rem;color:var(--text-secondary);text-align:center}.message-section{width:100%;margin-top:1rem;display:flex;flex-direction:column;gap:.25rem}.message-input{width:100%;padding:.75rem 1rem;border:2px solid var(--border);border-radius:var(--radius-sm);font-size:.875rem;font-family:inherit;color:var(--text);background:var(--card-bg);resize:none;transition:border-color .15s}.message-input:focus{outline:none;border-color:var(--primary)}.message-hint{font-size:.75rem;color:var(--text-secondary);text-align:right}.pay-btn{width:100%;padding:1rem;margin-top:1.5rem;border:none;border-radius:50px;background:linear-gradient(135deg,var(--primary),#7c3aed);color:#fff;font-size:1.05rem;font-weight:600;cursor:pointer;font-family:inherit;transition:opacity .15s,transform .1s}.pay-btn:hover:not(:disabled){opacity:.92}.pay-btn:active:not(:disabled){transform:scale(.98)}.pay-btn:disabled{opacity:.4;cursor:not-allowed}.security-badge{display:flex;align-items:center;gap:.375rem;margin-top:.75rem;font-size:.75rem;color:var(--success);font-weight:500}.badge-icon{font-weight:700}.processing-screen{justify-content:center;text-align:center;gap:1.5rem}.processing-screen h2{font-size:1.15rem;font-weight:600;max-width:280px}.processing-hint{font-size:.8rem;color:var(--text-secondary)}.success-screen{justify-content:center;text-align:center;gap:.5rem}.success-icon{width:72px;height:72px;border-radius:50%;background:var(--success);color:#fff;display:flex;align-items:center;justify-content:center;font-size:2rem;font-weight:700;margin-bottom:.5rem}.success-screen h1{font-size:1.75rem;font-weight:700}.success-subtitle{color:var(--text-secondary);font-size:.875rem;margin-bottom:1.5rem}.result-card{width:100%;background:var(--card-bg);border-radius:var(--radius);padding:1.25rem;box-shadow:0 1px 3px #0000000f}.result-row{display:flex;justify-content:space-between;align-items:center;padding:.5rem 0}.result-label{font-size:.8rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em;font-weight:500}.result-value{font-size:1.05rem;font-weight:600}.result-divider{border:none;border-top:1px solid var(--border);margin:.25rem 0}.secured-badge{color:var(--success);font-size:.8rem;font-weight:500;margin:1rem 0}.close-btn{width:100%;padding:1rem;border:none;border-radius:50px;background:var(--text);color:#fff;font-size:1rem;font-weight:600;cursor:pointer;font-family:inherit;transition:opacity .15s}.close-btn:hover{opacity:.9}.tip-again-btn{background:none;border:none;color:var(--text);font-size:.875rem;font-weight:500;cursor:pointer;padding:.75rem;font-family:inherit}.tip-again-btn:hover{color:var(--primary)}.error-screen{justify-content:center;text-align:center;gap:.75rem}.error-icon{width:72px;height:72px;border-radius:50%;background:var(--error);color:#fff;display:flex;align-items:center;justify-content:center;font-size:2rem;font-weight:700;margin-bottom:.5rem}.error-screen h1{font-size:1.75rem;font-weight:700}.error-message{color:var(--text-secondary);font-size:.875rem;max-width:280px;margin-bottom:1rem}