:root{--bg: #0f172a;--surface: #1e293b;--surface-2: #334155;--line: #475569;--text: #f8fafc;--muted: #94a3b8;--accent: #38bdf8;--accent-ink: #082f49;--ok: #22c55e;--warn: #f59e0b;--danger: #ef4444;--radius: 12px;--tap: 48px}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text);font-family:Sarabun,IBM Plex Sans Thai,-apple-system,BlinkMacSystemFont,Segoe UI,system-ui,sans-serif;font-size:16px;line-height:1.45;touch-action:manipulation;-webkit-text-size-adjust:100%}button{font:inherit;color:inherit;border:none;background:none;cursor:pointer;min-height:var(--tap)}input{font:inherit;color:inherit;background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius);padding:0 14px;min-height:var(--tap);width:100%}input:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.app{display:flex;flex-direction:column;height:100%}.topbar{display:flex;align-items:center;gap:12px;padding:10px 16px;background:var(--surface);border-bottom:1px solid var(--line)}.topbar .shop{font-weight:700}.topbar .branch{color:var(--muted);font-size:14px}.topbar .spacer{flex:1}.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:999px;font-size:13px;font-weight:600;background:var(--surface-2);color:var(--muted)}.chip.warn{background:#422006;color:#fbbf24}.chip.ok{background:#052e16;color:#4ade80}.linkish{color:var(--muted);font-size:14px;padding:6px 10px;border-radius:8px}.linkish:hover{background:var(--surface-2);color:var(--text)}.offline-banner{display:flex;align-items:center;gap:12px;padding:8px 16px;background:#422006;color:#fde68a;font-size:14px;font-weight:600}.offline-banner button{margin-left:auto;min-height:32px;padding:4px 12px;border-radius:8px;background:#78350f;color:#fde68a;font-size:13px}.pos{display:grid;grid-template-columns:1fr 380px;flex:1;min-height:0}@media(max-width:900px){.pos{grid-template-columns:1fr}.cart{border-left:none;border-top:1px solid var(--line)}}.catalog{display:flex;flex-direction:column;min-height:0;padding:12px 16px}.search{margin-bottom:12px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;overflow-y:auto;padding-bottom:16px;align-content:start}.tile{display:flex;flex-direction:column;gap:4px;text-align:left;padding:12px;min-height:92px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}.tile:active{transform:scale(.98)}.tile .name{font-weight:600;line-height:1.25}.tile .sku{color:var(--muted);font-size:12px}.tile .price{margin-top:auto;font-size:18px;font-weight:700}.tile .stock{font-size:12px;color:var(--muted)}.tile .stock.zero{color:var(--warn);font-weight:600}.empty{color:var(--muted);padding:32px 8px;text-align:center}.cart{display:flex;flex-direction:column;background:var(--surface);border-left:1px solid var(--line);min-height:0}.cart h2{margin:0;padding:14px 16px 10px;font-size:16px}.cart-lines{flex:1;overflow-y:auto;padding:0 16px}.line{display:grid;grid-template-columns:1fr auto;gap:4px 12px;padding:10px 0;border-bottom:1px solid var(--line)}.line .name{font-weight:600}.line .meta{color:var(--muted);font-size:13px}.line .amount{font-weight:700;text-align:right;white-space:nowrap}.qty{display:flex;align-items:center;gap:6px}.qty button{width:34px;min-height:34px;border-radius:8px;background:var(--surface-2);font-size:18px;font-weight:700;line-height:1}.qty span{min-width:28px;text-align:center;font-variant-numeric:tabular-nums}.totals{padding:12px 16px;border-top:1px solid var(--line)}.totals .row{display:flex;justify-content:space-between;padding:3px 0;color:var(--muted)}.totals .row.grand{color:var(--text);font-size:22px;font-weight:800;padding-top:8px}.totals .row.grand span:last-child{font-variant-numeric:tabular-nums}.actions{display:flex;gap:10px;padding:0 16px 16px}.btn{flex:1;border-radius:var(--radius);font-weight:700;background:var(--surface-2)}.btn.primary{background:var(--accent);color:var(--accent-ink);font-size:18px}.btn:disabled{opacity:.45;cursor:not-allowed}.backdrop{position:fixed;inset:0;background:#020617cc;display:flex;align-items:center;justify-content:center;padding:16px;z-index:10}.sheet{width:min(460px,100%);max-height:90vh;overflow-y:auto;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:20px}.sheet h2{margin:0 0 4px}.sheet .amount-due{font-size:34px;font-weight:800;margin-bottom:16px;font-variant-numeric:tabular-nums}.methods{display:grid;gap:10px;margin-bottom:16px}.method{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;border-radius:var(--radius);background:var(--surface-2);border:2px solid transparent;font-weight:600}.method.selected{border-color:var(--accent)}.qr{display:grid;place-items:center;gap:10px;padding:16px 0}.qr img{width:220px;height:220px;background:#fff;border-radius:12px;padding:10px}.hint{color:var(--muted);font-size:14px;text-align:center}.result{text-align:center;padding:12px 0 20px}.result .badge{font-size:44px}.result .bill{font-size:20px;font-weight:700;margin-top:6px}.result .note{color:var(--muted);margin-top:6px}.auth{display:grid;place-items:center;height:100%;padding:20px}.auth form,.auth .card{width:min(380px,100%);display:grid;gap:12px;background:var(--surface);padding:24px;border-radius:16px;border:1px solid var(--line)}.auth h1{margin:0 0 4px;font-size:22px}.auth label{display:grid;gap:6px;font-size:14px;color:var(--muted)}.error{color:#fca5a5;font-size:14px}