:root{--bg: #0f172a;--bg-elevated: #1e293b;--surface: #ffffff;--surface-muted: #f8fafc;--border: #e2e8f0;--text: #0f172a;--text-muted: #64748b;--primary: #4f46e5;--primary-hover: #4338ca;--primary-soft: #eef2ff;--success: #16a34a;--danger: #dc2626;--danger-soft: #fef2f2;--radius: 16px;--radius-sm: 10px;--shadow: 0 10px 30px rgba(15, 23, 42, .12);--shadow-sm: 0 2px 8px rgba(15, 23, 42, .08);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100%}body{background:linear-gradient(180deg,#0f172a,#1e293b);color:var(--text);-webkit-font-smoothing:antialiased}.app-shell{min-height:100vh;display:flex;justify-content:center;padding:24px 16px 48px}.page{width:100%;max-width:460px}.merchant-header{color:#fff;text-align:center;margin-bottom:20px}.merchant-logo{display:block;width:min(220px,60vw);height:auto;margin:0 auto 14px;filter:drop-shadow(0 8px 22px rgba(15,23,42,.28))}.merchant-header .badge{display:inline-flex;align-items:center;gap:6px;font-size:12px;letter-spacing:.04em;text-transform:uppercase;color:#c7d2fe;background:#4f46e540;padding:6px 12px;border-radius:999px;margin-bottom:12px}.merchant-header h1{font-size:22px;margin:0 0 4px}.merchant-header .sub{color:#94a3b8;font-size:14px;margin:0}.merchant-header .sub strong{color:#e2e8f0;font-weight:800}@media (max-width: 540px){.merchant-logo{width:min(180px,70vw);margin-bottom:12px}}.card-header-row{display:flex;align-items:center;gap:12px;padding:14px 16px 0}.card-back-btn{width:36px;height:36px;border-radius:50%;border:1.5px solid var(--border);background:var(--surface-muted);color:var(--text-muted);display:flex;align-items:center;justify-content:center;cursor:pointer;flex-shrink:0;transition:background .15s ease,border-color .15s ease,color .15s ease}.card-back-btn:hover{background:var(--primary-soft);border-color:var(--primary);color:var(--primary)}.card-back-btn:active{transform:scale(.93)}.card-header-title{font-size:14px;font-weight:700;color:var(--text);letter-spacing:.01em}.card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;margin-bottom:16px}.card-section{padding:20px}.section-title{display:flex;align-items:center;justify-content:space-between;font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin:0 0 14px}.status-pill{font-size:11px;font-weight:600;text-transform:none;letter-spacing:0;color:var(--primary);background:var(--primary-soft);padding:4px 10px;border-radius:999px}.order-item{display:flex;gap:12px;padding:10px 0}.order-item+.order-item{border-top:1px dashed var(--border)}.qty-chip{flex-shrink:0;min-width:28px;height:28px;padding:0 8px;border-radius:8px;background:var(--surface-muted);color:var(--text);font-size:13px;font-weight:600;display:inline-flex;align-items:center;justify-content:center}.order-item .details{flex:1}.order-item .name{font-weight:600;font-size:15px}.order-item .meta{font-size:13px;color:var(--text-muted);margin-top:2px}.order-item .price{font-weight:600;font-size:15px;white-space:nowrap}.totals-row{display:flex;justify-content:space-between;font-size:14px;padding:5px 0;color:var(--text-muted)}.totals-row.discount{color:var(--success)}.totals-row.grand{margin-top:8px;padding-top:14px;font-size:18px;font-weight:700;color:var(--text)}.tip-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.tip-grid-4{grid-template-columns:repeat(4,1fr)}.tip-option{border:1.5px solid var(--border);background:var(--surface);border-radius:var(--radius-sm);padding:12px 4px;cursor:pointer;text-align:center;transition:all .15s ease;font-family:inherit}.tip-option:hover{border-color:var(--primary)}.tip-option.active{border-color:var(--primary);background:var(--primary-soft)}.tip-option .pct{display:block;font-weight:700;font-size:16px;color:var(--text)}.tip-option .amt{display:block;font-size:12px;color:var(--text-muted);margin-top:2px}.tip-option.active .pct{color:var(--primary)}.custom-tip{margin-top:12px;display:flex;align-items:center;gap:8px}.custom-tip-input{direction:ltr;text-align:left;font-variant-numeric:tabular-nums}.tip-custom-input{border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:9px 8px;font-size:14px;font-weight:600;font-family:inherit;color:var(--text);background:var(--surface);outline:none;width:100%;min-width:0;transition:border-color .15s ease,box-shadow .15s ease}.tip-custom-input::placeholder{color:#94a3b8;font-weight:500;text-align:center}.tip-custom-input:focus,.tip-custom-input.active{border-color:var(--primary);background:var(--primary-soft);box-shadow:0 0 0 3px #4f46e51f}.tip-compact{padding-top:14px}.tip-compact .section-title{margin-bottom:10px}.tip-compact .tip-grid{gap:6px}.tip-compact .tip-option{padding:9px 2px;border-radius:8px}.tip-compact .tip-option .pct{font-size:14px}.tip-compact .tip-option .amt{font-size:11px}.tip-compact .custom-tip{margin-top:8px}.custom-tip .field{flex:1}.field{margin-bottom:16px}.field:last-child{margin-bottom:0}.field label{display:block;font-size:13px;font-weight:600;color:var(--text);margin-bottom:6px}.input-wrap{position:relative;display:flex;align-items:center}.field input{width:100%;padding:12px 14px;font-size:15px;border:1.5px solid var(--border);border-radius:var(--radius-sm);outline:none;transition:border-color .15s ease,box-shadow .15s ease;font-family:inherit;color:var(--text);background:var(--surface)}.field input::placeholder{color:#cbd5e1}.field input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e526}.field input.invalid{border-color:var(--danger);background:var(--danger-soft)}.field .error{color:var(--danger);font-size:12px;margin-top:6px}.field-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.card-brand{position:absolute;right:12px;height:22px;display:flex;align-items:center;pointer-events:none}.card-brand svg{height:22px;width:auto}.input-wrap input{padding-right:56px}.pay-button{width:100%;border:none;background:var(--primary);color:#fff;font-size:16px;font-weight:700;padding:16px;border-radius:var(--radius-sm);cursor:pointer;transition:background .15s ease,transform .05s ease;font-family:inherit;display:flex;align-items:center;justify-content:center;gap:8px}.pay-button:hover:not(:disabled){background:var(--primary-hover)}.pay-button:active:not(:disabled){transform:translateY(1px)}.pay-button:disabled{opacity:.55;cursor:not-allowed}.secure-note{display:flex;align-items:center;justify-content:center;gap:6px;color:#94a3b8;font-size:12px;margin-top:16px}.state-card{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow);padding:40px 24px;text-align:center}.spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;margin:0 auto 16px;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.state-card h2{margin:0 0 8px;font-size:18px}.state-card p{margin:0 0 20px;color:var(--text-muted);font-size:14px}.state-icon{width:56px;height:56px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;margin-bottom:16px}.state-icon.success{background:#dcfce7;color:var(--success)}.state-icon.error{background:var(--danger-soft);color:var(--danger)}.btn-secondary{background:var(--surface-muted);border:1.5px solid var(--border);color:var(--text);font-weight:600;padding:12px 20px;border-radius:var(--radius-sm);cursor:pointer;font-family:inherit;font-size:14px}.btn-secondary:hover{background:var(--border)}.skeleton{background:linear-gradient(90deg,#f1f5f9 25%,#e2e8f0 37%,#f1f5f9 63%);background-size:400% 100%;animation:shimmer 1.4s ease infinite;border-radius:6px}@keyframes shimmer{0%{background-position:100% 0}to{background-position:-100% 0}}.demo-links{margin-top:8px;color:#64748b;font-size:13px;text-align:center}.demo-links a{color:var(--primary);text-decoration:none}.demo-links a:hover{text-decoration:underline}