:root {
  --bg: #f5f5f4;
  --surface: #ffffff;
  --surface-2: #fafaf9;
  --text: #18181b;
  --muted: #6b6b70;
  --border: #e4e4e7;
  --accent: #18181b;
  --accent-text: #ffffff;
  --good: #15803d;
  --good-bg: #dcfce7;
  --warn: #a16207;
  --warn-bg: #fef9c3;
  --bad: #b91c1c;
  --bad-bg: #fee2e2;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 1px 8px rgba(0,0,0,.04);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0c0d; --surface: #161618; --surface-2: #1c1c1f; --text: #f4f4f5; --muted: #a1a1aa;
    --border: #2a2a2e; --accent: #f4f4f5; --accent-text: #111;
    --good: #4ade80; --good-bg: #14301e; --warn: #facc15; --warn-bg: #332b0b; --bad: #f87171; --bad-bg: #3a1414;
    --shadow: none; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg); color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
.boot { padding: 40px; text-align: center; color: var(--muted); }

/* Layout */
.shell { display: grid; grid-template-columns: 220px minmax(0, 1fr); min-height: 100vh; }
.main, .grid > * { min-width: 0; }
.tabs { max-width: 100%; }
.side {
  background: var(--surface); border-right: 1px solid var(--border);
  padding: 18px 12px; display: flex; flex-direction: column; gap: 4px; position: sticky; top: 0; height: 100vh;
}
.brand { font-weight: 700; font-size: 16px; padding: 4px 10px 16px; display: flex; gap: 8px; align-items: center; }
.brand small { display: block; font-weight: 400; color: var(--muted); font-size: 12px; }
.nav a {
  display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 8px;
  text-decoration: none; color: var(--muted); font-weight: 500;
}
.nav a:hover { background: var(--surface-2); color: var(--text); }
.nav a.on { background: var(--accent); color: var(--accent-text); }
.side .who { margin-top: auto; padding: 10px; font-size: 13px; color: var(--muted); border-top: 1px solid var(--border); }
.side .who b { color: var(--text); display: block; }
.main { padding: 24px clamp(16px, 3vw, 36px) 80px; max-width: 1200px; width: 100%; }
.head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 18px; }
.head h1 { font-size: 22px; margin: 0; letter-spacing: -.01em; }
.head .sub { color: var(--muted); font-size: 13px; }

@media (max-width: 820px) {
  .shell { grid-template-columns: minmax(0, 1fr); }
  .side {
    position: fixed; bottom: 0; top: auto; left: 0; right: 0; height: auto; z-index: 20;
    flex-direction: row; padding: 6px; border-right: 0; border-top: 1px solid var(--border);
  }
  .brand, .side .who { display: none; }
  .nav { display: flex; width: 100%; justify-content: space-around; }
  .nav a { flex-direction: column; gap: 2px; font-size: 11px; padding: 6px 4px; flex: 1; justify-content: center; text-align: center; }
  .nav a svg { width: 20px; height: 20px; }
  .main { padding: 16px 16px 96px; }
}

/* Componentes */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.pad { padding: 16px; }
.grid { display: grid; gap: 12px; }
.kpis { grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); margin-bottom: 14px; }
.kpi { padding: 14px 16px; }
.kpi .l { color: var(--muted); font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .04em; }
.kpi .v { font-size: 22px; font-weight: 700; margin-top: 4px; font-variant-numeric: tabular-nums; }
.kpi .s { color: var(--muted); font-size: 12px; margin-top: 2px; }
.kpi .v.good { color: var(--good); }
.two { grid-template-columns: 1.4fr 1fr; }
@media (max-width: 900px) { .two { grid-template-columns: 1fr; } }
h2 { font-size: 15px; margin: 0 0 12px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid var(--border); background: var(--surface); padding: 8px 14px; border-radius: 8px;
  cursor: pointer; font-weight: 600; font-size: 14px; text-decoration: none; white-space: nowrap;
}
.btn:hover { background: var(--surface-2); }
.btn.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.btn.primary:hover { opacity: .9; }
.btn.danger { color: var(--bad); }
.btn.sm { padding: 5px 10px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

input, select, textarea {
  width: 100%; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 9px 11px;
}
input:focus, select:focus, textarea:focus, .btn:focus-visible, .nav a:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
textarea { min-height: 70px; resize: vertical; }
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 4px; color: var(--muted); }
.fields { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
.fields .full { grid-column: 1 / -1; }
fieldset { border: 0; padding: 0; margin: 0 0 18px; }
legend { font-weight: 700; font-size: 14px; margin-bottom: 10px; padding: 0; }

/* Lista de sugerencias de los campos (marca, procesador, gráficos…) */
.combo {
  position: fixed; z-index: 200; overflow-y: auto; background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: 9px; padding: 4px; box-shadow: 0 10px 30px rgba(0,0,0,.3);
}
.combo[hidden] { display: none; }
.combo [role=option] { padding: 8px 10px; border-radius: 6px; cursor: pointer; font-size: 14px; }
.combo [role=option]:hover, .combo [role=option].on { background: var(--surface-2); }
.combo [role=option].sel { font-weight: 700; }
.combo [role=option].sel::after { content: " ✓"; }

/* Menú desplegable de "+ Agregar" */
.dropdown { position: relative; }
.menu {
  position: absolute; right: 0; top: calc(100% + 6px); z-index: 30; min-width: 220px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 6px;
  box-shadow: 0 8px 30px rgba(0,0,0,.18); display: flex; flex-direction: column;
}
.menu[hidden] { display: none; }
.menu button {
  display: flex; align-items: center; gap: 10px; width: 100%; text-align: left;
  border: 0; background: none; padding: 9px 10px; border-radius: 7px; cursor: pointer; font-weight: 600;
}
.menu button:hover, .menu button:focus-visible { background: var(--surface-2); outline: none; }
.menu .mi { width: 22px; text-align: center; font-size: 17px; }
.tabs { display: flex; gap: 4px; background: var(--surface); border: 1px solid var(--border); border-radius: 9px; padding: 3px; overflow-x: auto; }
.tabs button { border: 0; background: none; padding: 6px 12px; border-radius: 6px; cursor: pointer; font-weight: 600; color: var(--muted); white-space: nowrap; }
.tabs button.on { background: var(--accent); color: var(--accent-text); }
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 14px; }
.toolbar input[type=search] { max-width: 320px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th { text-align: left; font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); font-weight: 600; padding: 10px 12px; border-bottom: 1px solid var(--border); }
td { padding: 10px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
.num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.table-wrap { overflow-x: auto; }

.badge { display: inline-block; padding: 2px 8px; border-radius: 99px; font-size: 12px; font-weight: 600; }
.b-disponible, .b-activa { background: var(--good-bg); color: var(--good); }
.b-reservado { background: var(--warn-bg); color: var(--warn); }
.b-vendido, .b-anulada { background: var(--surface-2); color: var(--muted); border: 1px solid var(--border); }
.b-anulada { color: var(--bad); }

/* Tarjetas de inventario */
.items { grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); }
.item { padding: 14px 16px; display: flex; flex-direction: column; gap: 10px; }
.item h3 { margin: 0; font-size: 16px; }
.item .specs { display: grid; grid-template-columns: auto 1fr; gap: 3px 10px; font-size: 13px; margin: 0; }
.item .specs dt { color: var(--muted); }
.item .specs dd { margin: 0; }
.item .money { display: flex; justify-content: space-between; font-size: 13px; padding-top: 10px; border-top: 1px dashed var(--border); }
.item .money b { font-size: 16px; }
.item .acts { display: flex; gap: 6px; flex-wrap: wrap; margin-top: auto; }

/* Gráfico */
.bars { display: flex; align-items: flex-end; gap: 4px; height: 140px; padding-top: 8px; }
.bars .b { flex: 1; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; height: 100%; gap: 4px; min-width: 0; }
.bars .b i { display: block; width: 100%; max-width: 26px; background: var(--accent); border-radius: 4px 4px 1px 1px; min-height: 2px; }
.bars .b span { font-size: 10px; color: var(--muted); }
.list { display: flex; flex-direction: column; }
.list a, .list div.li { display: flex; justify-content: space-between; gap: 10px; padding: 10px 0; border-bottom: 1px solid var(--border); text-decoration: none; }
.list > :last-child { border-bottom: 0; }
.live { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); }
.live::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--good); animation: pulse 2s infinite; }
@keyframes pulse { 50% { opacity: .3; } }

/* Venta */
.lines td input { min-width: 90px; }
.totals { display: grid; grid-template-columns: 1fr auto; gap: 6px 20px; font-size: 14px; max-width: 340px; margin-left: auto; }
.totals .big { font-size: 20px; font-weight: 800; }
.picker { max-height: 280px; overflow: auto; border: 1px solid var(--border); border-radius: 8px; }
.picker button { display: flex; width: 100%; justify-content: space-between; gap: 10px; text-align: left; padding: 10px 12px; border: 0; border-bottom: 1px solid var(--border); background: var(--surface); cursor: pointer; }
.picker button:hover { background: var(--surface-2); }
.picker button:last-child { border-bottom: 0; }

/* Modal */
.modal-bg { position: fixed; inset: 0; background: rgba(0,0,0,.45); display: flex; align-items: flex-start; justify-content: center; padding: 5vh 16px; z-index: 50; overflow-y: auto; }
.modal { width: 100%; max-width: 760px; padding: 20px; }
.modal.narrow { max-width: 480px; }
.modal .mh { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.modal .mh h2 { margin: 0; font-size: 18px; }
.ficha { white-space: pre-wrap; background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; padding: 14px; font-size: 14px; margin: 0 0 14px; max-height: 50vh; overflow: auto; }

/* Login */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login .card { width: 100%; max-width: 360px; padding: 28px; }
.login h1 { font-size: 20px; margin: 0 0 4px; }
.err { color: var(--bad); font-size: 13px; min-height: 18px; margin: 8px 0; }

#toast { position: fixed; left: 50%; bottom: 90px; transform: translateX(-50%) translateY(20px); background: var(--accent); color: var(--accent-text); padding: 10px 16px; border-radius: 8px; font-weight: 600; opacity: 0; pointer-events: none; transition: .2s; z-index: 99; max-width: calc(100% - 32px); }
#toast.show { opacity: 1; transform: translateX(-50%); }
.empty { padding: 40px 16px; text-align: center; color: var(--muted); }

/* Factura */
/* Hoja A4 vertical: 210 x 297 mm */
.invoice {
  background: #fff; color: #111; margin: 0 auto 14px; padding: 16mm 15mm;
  width: 210mm; max-width: 100%; min-height: 297mm; box-sizing: border-box;
  display: flex; flex-direction: column; box-shadow: 0 2px 14px rgba(0,0,0,.25); border-radius: 2px;
}
.invoice .sign { margin-top: auto !important; padding-top: 50px; }
.invoice .ih { display: flex; justify-content: space-between; gap: 20px; border-bottom: 2px solid #111; padding-bottom: 16px; margin-bottom: 18px; }
.invoice .ih h2 { font-size: 22px; margin: 0 0 4px; }
.invoice .ih .r { text-align: right; }
.invoice .ih .r .n { font-size: 20px; font-weight: 800; }
.invoice .meta { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 18px; font-size: 14px; }
.invoice .meta h4 { margin: 0 0 4px; font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: #666; }
.invoice table th { color: #555; border-color: #ccc; }
.invoice table td { border-color: #e5e5e5; }
.invoice .totals { margin-top: 14px; }
.invoice .foot { margin-top: 28px; font-size: 12px; color: #444; border-top: 1px solid #ddd; padding-top: 12px; }
.invoice .sign { display: flex; justify-content: space-between; gap: 40px; margin-top: 50px; font-size: 12px; }
.invoice .sign div { flex: 1; border-top: 1px solid #111; padding-top: 6px; text-align: center; }
.invoice .void { color: #b91c1c; border: 2px solid #b91c1c; padding: 6px 12px; text-align: center; font-weight: 800; margin-bottom: 14px; letter-spacing: .1em; }
@media (max-width: 820px) { .invoice { padding: 18px; min-height: 0; } .invoice .meta { grid-template-columns: 1fr; } }

/* Ticket vertical (rollo térmico 80 / 58 mm) */
.ticket {
  background: #fff; color: #000; margin: 0 auto 14px; padding: 14px 12px 18px;
  font: 12px/1.35 "Consolas", "Courier New", ui-monospace, monospace;
  box-shadow: 0 2px 14px rgba(0,0,0,.25); border-radius: 2px;
}
.ticket.p80 { width: 80mm; }
.ticket.p58 { width: 58mm; font-size: 10.5px; padding: 10px 6px 14px; }
.ticket hr { border: 0; border-top: 1px dashed #000; margin: 8px 0; }
.ticket .t-center { text-align: center; }
.ticket .t-name { font-size: 1.45em; font-weight: 800; margin-bottom: 2px; letter-spacing: .02em; }
.ticket .t-title { font-weight: 800; margin-bottom: 4px; }
.ticket .kv { display: flex; justify-content: space-between; gap: 8px; }
.ticket .kv span:last-child { text-align: right; overflow-wrap: anywhere; }
.ticket .t-item { margin-bottom: 6px; }
.ticket .t-item > div:first-child { overflow-wrap: anywhere; }
.ticket .t-item .kv { padding-left: 8px; }
.ticket .t-total { font-size: 1.35em; font-weight: 800; margin-top: 4px; }
.ticket .t-block { margin: 6px 0; overflow-wrap: anywhere; }
.ticket .t-small { font-size: .85em; margin-top: 8px; }
.ticket .t-sign { margin: 34px 10px 10px; border-top: 1px solid #000; text-align: center; padding-top: 3px; }
.ticket .t-void { text-align: center; font-weight: 800; border: 2px solid #000; padding: 4px; margin-bottom: 8px; }

@media print {
  html, body { background: #fff !important; margin: 0; }
  .side, .noprint, #toast { display: none !important; }
  .shell { display: block; }
  .main { padding: 0; max-width: none; }
  .ticket { box-shadow: none; border-radius: 0; margin: 0; }
  .invoice { box-shadow: none; border-radius: 0; margin: 0; width: 210mm; max-width: none; min-height: 296mm; padding: 16mm 15mm; }
  .invoice .meta { grid-template-columns: 1fr 1fr; }
}