:root{
  --bg:#e9ebee; --card:#fff; --ink:#1b1f26; --muted:#5f6670; --line:#d5d9df;
  --brand:#1f3468; --brand-ink:#fff; --accent:#e2211c;  /* azul y rojo del logo INVEDIN */ --green:#1f7a4d; --green-bg:#e3f4ea;
  --amber:#9a6400; --amber-bg:#fff4d6; --red:#e2211c; --red-bg:#fde8e8;
  --radius:8px; --shadow:0 1px 2px rgba(0,0,0,.06),0 6px 18px rgba(0,0,0,.05);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:inherit}
button,input,select,textarea{font:inherit}
h1,h2,h3{margin:0 0 .5rem;line-height:1.2}
.topbar{position:sticky;top:0;z-index:20;background:var(--brand);color:var(--brand-ink);display:flex;align-items:center;gap:.75rem;padding:.6rem .9rem;box-shadow:var(--shadow)}
.topbar .brand{flex:1;display:flex;align-items:center;gap:.6rem;min-width:0}
.topbar .logo{background:#fff;border-radius:4px;padding:4px 8px;display:flex;align-items:center;height:36px}
.topbar .logo img{height:100%;width:auto;display:block}
.topbar .brand .txt{font-size:.8rem;opacity:.9;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
@media(max-width:480px){.topbar .brand .txt{display:none}}
.topbar .tasa{font-size:.85rem;background:rgba(255,255,255,.18);padding:.25rem .6rem;border-radius:5px;white-space:nowrap}
.topbar .tasa:empty{display:none}
.topbar .tasa.stale{background:var(--amber-bg);color:var(--amber)}
.nav{display:flex;gap:.3rem;overflow-x:auto;padding:.5rem .9rem;background:#fff;border-bottom:1px solid var(--line)}
.nav a{white-space:nowrap;padding:.4rem .8rem;border-radius:5px;text-decoration:none;font-size:.9rem;color:var(--muted);border:1px solid transparent}
.nav a.active,.nav a:hover{background:var(--bg);color:var(--ink);border-color:var(--line)}
.wrap{padding:1rem .9rem 5rem;max-width:1100px;margin:0 auto}
.card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:1rem;margin-bottom:1rem}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;border:1px solid var(--line);background:#fff;color:var(--ink);padding:.6rem 1rem;border-radius:5px;cursor:pointer;text-decoration:none;font-weight:600;min-height:44px}
.btn:active{transform:scale(.98)}
.btn.primary{background:var(--brand);color:#fff;border-color:var(--brand)}
.btn.green{background:var(--green);color:#fff;border-color:var(--green)}
.btn.ghost{background:transparent}
.btn.danger{color:var(--red);border-color:#f0c7c9;background:var(--red-bg)}
.btn.sm{min-height:36px;padding:.35rem .7rem;font-size:.9rem}
.btn.block{width:100%}
.btn:disabled{opacity:.45;cursor:not-allowed}
input[type=text],input[type=number],input[type=password],input[type=date],input[type=tel],select,textarea{width:100%;padding:.65rem .8rem;border:1px solid var(--line);border-radius:5px;background:#fff;min-height:44px}
label{display:block;font-size:.85rem;color:var(--muted);margin:.5rem 0 .25rem}
.flash{padding:.7rem 1rem;border-radius:6px;margin-bottom:1rem;font-weight:500}
.flash.ok{background:var(--green-bg);color:var(--green)}
.flash.error{background:var(--red-bg);color:var(--red)}
.pill{display:inline-block;font-size:.75rem;font-weight:700;padding:.15rem .55rem;border-radius:999px;text-transform:uppercase;letter-spacing:.3px}
.pill.ok{background:var(--green-bg);color:var(--green)}
.pill.warn{background:var(--amber-bg);color:var(--amber)}
.pill.off{background:#eee;color:#777}
.pill.red{background:var(--red-bg);color:var(--red)}
.muted{color:var(--muted)}
.small{font-size:.85rem}
.row{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap}
.grow{flex:1}
table{width:100%;border-collapse:collapse;font-size:.92rem}
th,td{text-align:left;padding:.5rem .4rem;border-bottom:1px solid var(--line);vertical-align:middle}
th{font-size:.78rem;text-transform:uppercase;color:var(--muted);letter-spacing:.4px}
td.num,th.num{text-align:right;white-space:nowrap}
.table-wrap{overflow-x:auto}

/* ---------- POS ---------- */
.pos{display:grid;grid-template-columns:1fr;gap:1rem}
@media(min-width:900px){.pos{grid-template-columns:1.4fr 1fr;align-items:start}.cart{position:sticky;top:64px}}
.cats{display:flex;gap:.4rem;overflow-x:auto;padding-bottom:.5rem;margin-bottom:.5rem}
.cats button{white-space:nowrap;border:1px solid var(--line);background:#fff;padding:.4rem .9rem;border-radius:5px;cursor:pointer}
.cats button.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:.6rem}
.prod{background:#fff;border:1px solid var(--line);border-radius:6px;padding:.75rem;cursor:pointer;min-height:96px;display:flex;flex-direction:column;justify-content:space-between;position:relative;box-shadow:var(--shadow)}
.prod:active{transform:scale(.97)}
.prod .n{font-weight:600;line-height:1.2}
.prod .p{font-size:1.1rem;font-weight:700;margin-top:.4rem}
.prod .s{font-size:.75rem;color:var(--muted)}
.prod.off{opacity:.5;cursor:not-allowed;background:#f6f6f6}
.prod.low .s{color:var(--amber);font-weight:600}
.prod .badge{position:absolute;top:-6px;right:-6px;background:var(--brand);color:#fff;font-size:.8rem;font-weight:700;min-width:24px;height:24px;border-radius:999px;display:flex;align-items:center;justify-content:center;padding:0 6px}
.cart-items{max-height:40vh;overflow-y:auto;margin:.5rem 0}
.ci{display:flex;align-items:center;gap:.5rem;padding:.5rem 0;border-bottom:1px solid var(--line)}
.ci .n{flex:1;min-width:0}
.ci .n small{display:block;color:var(--muted)}
.qty{display:flex;align-items:center;border:1px solid var(--line);border-radius:5px;overflow:hidden}
.qty button{border:0;background:#fff;width:38px;height:38px;font-size:1.2rem;cursor:pointer}
.qty span{min-width:30px;text-align:center;font-weight:700}
.ci .sub{min-width:64px;text-align:right;font-weight:600}
.ci .del{border:0;background:none;color:var(--red);font-size:1.2rem;cursor:pointer;padding:.3rem}
.totals{padding:.6rem 0;border-top:2px solid var(--ink);margin-top:.4rem}
.totals .t{display:flex;justify-content:space-between;font-size:1.3rem;font-weight:800}
.totals .b{display:flex;justify-content:space-between;color:var(--muted)}
.empty{text-align:center;color:var(--muted);padding:1.5rem 0}
.pay-methods{display:grid;grid-template-columns:1fr 1fr;gap:.5rem;margin:.5rem 0}
.pay-methods label{margin:0}
.pay-methods input{display:none}
.pay-methods span{display:flex;align-items:center;justify-content:center;text-align:center;border:2px solid var(--line);border-radius:6px;padding:.7rem .5rem;font-weight:600;cursor:pointer;min-height:52px;color:var(--ink)}
.pay-methods input:checked+span{border-color:var(--brand);background:#e9edf6;color:var(--brand)}

/* modal */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.45);display:none;align-items:flex-end;justify-content:center;z-index:50;padding:0}
.modal.open{display:flex}
.modal .box{background:#fff;width:100%;max-width:520px;border-radius:10px 10px 0 0;padding:1rem 1rem 1.5rem;max-height:92vh;overflow-y:auto}
@media(min-width:700px){.modal{align-items:center;padding:1rem}.modal .box{border-radius:10px}}
.modal h3{display:flex;justify-content:space-between;align-items:center}
.modal .x{border:0;background:none;font-size:1.5rem;cursor:pointer;color:var(--muted)}

/* mobile cart bar */
.cartbar{position:fixed;left:0;right:0;bottom:0;background:var(--ink);color:#fff;padding:.7rem 1rem;display:flex;justify-content:space-between;align-items:center;z-index:30;box-shadow:0 -4px 16px rgba(0,0,0,.15)}
.cartbar b{font-size:1.15rem}
@media(min-width:900px){.cartbar{display:none}}

/* recibo */
.recibo{max-width:380px;margin:1rem auto;background:#fff;padding:1.2rem;border-radius:6px;box-shadow:var(--shadow);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9rem}
.recibo h2{text-align:center;font-size:1rem}
.recibo .c{text-align:center;color:var(--muted);font-size:.8rem}
.recibo hr{border:0;border-top:1px dashed #999;margin:.6rem 0}
.recibo .l{display:flex;justify-content:space-between;gap:.5rem}
.recibo .tot{font-size:1.1rem;font-weight:800}
.recibo .anulado{color:var(--red);text-align:center;font-weight:800;border:2px solid var(--red);padding:.3rem;margin:.5rem 0}
@media print{body{background:#fff}.topbar,.nav,.noprint,.cartbar{display:none!important}.recibo{box-shadow:none;margin:0;max-width:none}}
.login{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:1rem}
.login .card{width:100%;max-width:380px}
.stat{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.6rem;margin-bottom:1rem}
.stat div{background:#fff;border:1px solid var(--line);border-radius:6px;padding:.8rem}
.stat b{display:block;font-size:1.4rem}
.stat span{font-size:.8rem;color:var(--muted)}
details summary{cursor:pointer;font-weight:600;padding:.4rem 0}