/* ==========================================================
   Estilos de la aplicación de ventas
   ========================================================== */
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: #f2f4f7;
    color: #23303b;
    font-size: 15px;
}

/* ---- Barra superior ---- */
.topbar {
    display: flex;
    align-items: center;
    gap: 20px;
    background: #1f3a5f;
    color: #fff;
    padding: 0 18px;
    height: 56px;
}
.brand { font-weight: 700; font-size: 18px; white-space: nowrap; }
.menu { display: flex; gap: 4px; flex: 1; flex-wrap: wrap; }
.menu a {
    color: #d7e2f0;
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 14px;
}
.menu a:hover { background: #2c4d78; color: #fff; }
.menu a.activo { background: #3d6bad; color: #fff; }
.usuario { display: flex; align-items: center; gap: 12px; font-size: 13px; }
.btn-salir {
    background: #c0392b; color: #fff; text-decoration: none;
    padding: 6px 12px; border-radius: 6px;
}
.btn-salir:hover { background: #a5281b; }

/* ---- Contenido ---- */
.contenido { max-width: 1080px; margin: 24px auto; padding: 0 18px; }
h1 { font-size: 22px; margin: 0 0 18px; }
h2 { font-size: 18px; margin: 24px 0 12px; }

/* ---- Tarjetas ---- */
.card {
    background: #fff;
    border: 1px solid #e2e6ea;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
}
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px,1fr)); gap: 16px; margin-bottom: 16px; }
/* Rejillas de ancho completo con número fijo de columnas */
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 640px) {
    .grid-3, .grid-2 { grid-template-columns: 1fr; }
}
.stat { background:#fff; border:1px solid #e2e6ea; border-radius:10px; padding:18px; }
.stat .num { font-size: 26px; font-weight: 700; color:#1f3a5f; }
.stat .lbl { color:#6a7683; font-size: 13px; }

/* ---- Formularios ---- */
form .campo { margin-bottom: 14px; }
label { display:block; font-weight:600; margin-bottom:5px; font-size:13px; color:#3a4753; }
input[type=text], input[type=password], input[type=number], input[type=date],
input[type=email], select, textarea {
    width: 100%; padding: 9px 11px; border:1px solid #c4ccd4; border-radius:7px;
    font-size: 14px; background:#fff;
}
input:focus, select:focus, textarea:focus { outline:2px solid #3d6bad; border-color:#3d6bad; }
.fila { display:flex; gap:14px; flex-wrap:wrap; }
.fila .campo { flex:1; min-width:180px; }

.btn {
    display:inline-block; background:#3d6bad; color:#fff; border:none;
    padding:10px 18px; border-radius:7px; font-size:14px; cursor:pointer; text-decoration:none;
}
.btn:hover { background:#2c517f; }
.btn-sec { background:#5a6672; }
.btn-sec:hover { background:#454f59; }
.btn-ok { background:#2e7d43; }
.btn-ok:hover { background:#245e34; }
.btn-sm { padding:5px 10px; font-size:13px; }

/* ---- Tablas ---- */
table.tabla { width:100%; border-collapse:collapse; background:#fff; }
table.tabla th, table.tabla td { padding:9px 11px; border-bottom:1px solid #e6e9ec; text-align:left; }
table.tabla th { background:#eef2f7; font-size:13px; color:#3a4753; }
table.tabla tr:hover td { background:#f7f9fb; }
.num-col { text-align:right; font-variant-numeric: tabular-nums; }

/* Debe / Haber */
.debe  { color:#b23b2e; }
.haber { color:#2e7d43; }
.total-fila td { font-weight:700; background:#eef2f7; }

/* ---- Alertas ---- */
.alert { padding:11px 14px; border-radius:8px; margin-bottom:16px; font-size:14px; }
.alert-error { background:#fdecea; color:#a5281b; border:1px solid #f5c2bd; }
.alert-ok    { background:#e8f5ec; color:#245e34; border:1px solid #b7dfc4; }
.alert-info  { background:#e9f0f8; color:#264a73; border:1px solid #c2d4ea; }

/* ---- Login ---- */
.login-wrap { max-width:380px; margin:70px auto; }
.login-box { background:#fff; border:1px solid #e2e6ea; border-radius:12px; padding:30px; }
.login-box h1 { text-align:center; }

.piepagina { text-align:center; color:#8a97a3; font-size:12px; padding:24px; }
.acciones { display:flex; gap:8px; flex-wrap:wrap; margin:12px 0; }
.muted { color:#6a7683; font-size:13px; }
.tabs { display:flex; gap:4px; border-bottom:2px solid #dfe4ea; margin-bottom:20px; }
.tabs .tab { padding:10px 16px; text-decoration:none; color:#5a6672; border-bottom:3px solid transparent; margin-bottom:-2px; font-weight:600; font-size:14px; }
.tabs .tab:hover { color:#1f3a5f; }
.tabs .tab.active { color:#1f3a5f; border-bottom-color:#3d6bad; }
.linea-venta { border:1px solid #dfe4ea; border-radius:9px; padding:14px; margin-bottom:12px; background:#fafbfc; }
.linea-venta .lin-sub { text-align:right; font-weight:600; }
/* Saldo desde la óptica del cliente (negativo = debe dinero) */
.saldo-rojo  { color:#c0392b; font-weight:700; }  /* debe > haber -> negativo, rojo */
.saldo-negro { color:#23303b; font-weight:700; }  /* debe < haber -> a favor, negro */
.saldo-verde { color:#2e7d43; font-weight:700; }  /* debe = haber -> al día, verde */

/* ==========================================================
   IMPRESIÓN A4 (factura / ticket)
   ========================================================== */
@media screen {
    .doc-a4 {
        width: 210mm; min-height: 297mm; margin: 20px auto; padding: 18mm;
        background:#fff; box-shadow:0 0 12px rgba(0,0,0,.15);
    }
    .no-print { display:block; }
}
@media print {
    body { background:#fff; }
    .topbar, .piepagina, .no-print { display:none !important; }
    .doc-a4 { width:auto; margin:0; padding:0; box-shadow:none; }
    @page { size: A4; margin: 15mm; }
}