/* =====================================================================
   Sistema de Congelados - Estilos
   ===================================================================== */
:root {
    --azul-900: #0b2545;
    --azul-800: #10375c;
    --azul-700: #15508a;
    --azul-600: #1d6fb8;
    --azul-500: #2b8ede;
    --azul-100: #e8f2fb;
    --celeste:   #d5ecff;
    --gris-900:  #1f2937;
    --gris-700:  #4b5563;
    --gris-500:  #6b7280;
    --gris-300:  #d1d5db;
    --gris-200:  #e5e7eb;
    --gris-100:  #f3f4f6;
    --gris-50:   #f9fafb;
    --blanco:    #ffffff;
    --verde:     #16a34a;
    --verde-bg:  #dcfce7;
    --rojo:      #dc2626;
    --rojo-bg:   #fee2e2;
    --ambar:     #d97706;
    --ambar-bg:  #fef3c7;
    --celeste-bg:#e0f2fe;
    --radio: 10px;
    --sombra: 0 1px 3px rgba(11,37,69,.08), 0 1px 2px rgba(11,37,69,.06);
    --sombra-lg: 0 10px 30px rgba(11,37,69,.12);
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
    color: var(--gris-900);
    background: var(--gris-100);
    font-size: 15px;
    line-height: 1.45;
}

a { color: var(--azul-600); text-decoration: none; }
a:hover { text-decoration: underline; }

/* --------------------------- Layout ------------------------------- */
.layout { display: flex; min-height: 100vh; }

.sidebar {
    width: 250px;
    background: linear-gradient(180deg, var(--azul-900), var(--azul-800));
    color: #dbeafe;
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 20px 18px;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.brand-ico { font-size: 22px; }
.brand-txt { letter-spacing: .3px; }

.nav { padding: 12px 10px; display: flex; flex-direction: column; gap: 2px; overflow-y: auto; }
.nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 8px;
    color: #c9def5;
    font-size: 14.5px;
    transition: background .15s, color .15s;
}
.nav-link:hover { background: rgba(255,255,255,.08); color: #fff; text-decoration: none; }
.nav-link.active { background: var(--azul-600); color: #fff; font-weight: 600; }
.nav-ico { width: 20px; text-align: center; }

.main { flex: 1 1 auto; display: flex; flex-direction: column; min-width: 0; }

.topbar {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 24px;
    background: var(--blanco);
    border-bottom: 1px solid var(--gris-200);
    position: sticky;
    top: 0;
    z-index: 20;
}
.page-title { font-size: 19px; margin: 0; flex: 1 1 auto; font-weight: 700; color: var(--azul-900); }

.user-box { display: flex; align-items: center; gap: 12px; }
.user-info { display: flex; flex-direction: column; align-items: flex-end; line-height: 1.2; }
.user-name { font-weight: 600; font-size: 14px; }

.menu-toggle { display: none; font-size: 20px; background: none; border: 0; cursor: pointer; color: var(--azul-900); }

.content { padding: 24px; flex: 1 1 auto; }
.footer { padding: 16px 24px; color: var(--gris-500); font-size: 12.5px; border-top: 1px solid var(--gris-200); background: var(--blanco); }

/* --------------------------- Botones ------------------------------ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 9px 15px;
    border-radius: 8px;
    border: 1px solid transparent;
    background: var(--azul-600);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    line-height: 1.2;
    transition: background .15s, border-color .15s, opacity .15s;
    white-space: nowrap;
}
.btn:hover { background: var(--azul-700); color: #fff; text-decoration: none; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-sm { padding: 6px 10px; font-size: 13px; }
.btn-lg { padding: 12px 20px; font-size: 15.5px; }
.btn-block { width: 100%; justify-content: center; }

.btn-ghost { background: transparent; color: var(--azul-700); border-color: var(--gris-300); }
.btn-ghost:hover { background: var(--gris-100); color: var(--azul-800); }

.btn-outline { background: #fff; color: var(--azul-700); border-color: var(--azul-600); }
.btn-outline:hover { background: var(--azul-100); }

.btn-success { background: var(--verde); }
.btn-success:hover { background: #15803d; }

.btn-danger { background: var(--rojo); }
.btn-danger:hover { background: #b91c1c; }

.btn-warn { background: var(--ambar); }
.btn-warn:hover { background: #b45309; }

.btn-icon { padding: 5px 8px; font-size: 13px; }

/* --------------------------- Tarjetas ----------------------------- */
.card {
    background: var(--blanco);
    border: 1px solid var(--gris-200);
    border-radius: var(--radio);
    box-shadow: var(--sombra);
    margin-bottom: 20px;
}
.card-head {
    padding: 14px 18px;
    border-bottom: 1px solid var(--gris-200);
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}
.card-head h2, .card-head h3 { margin: 0; font-size: 16px; color: var(--azul-900); }
.card-head .spacer { flex: 1 1 auto; }
.card-body { padding: 18px; }
.card-body.p0 { padding: 0; }

.grid { display: grid; gap: 16px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.stat {
    background: var(--blanco);
    border: 1px solid var(--gris-200);
    border-radius: var(--radio);
    padding: 16px 18px;
    box-shadow: var(--sombra);
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.stat-label { font-size: 12.5px; color: var(--gris-500); text-transform: uppercase; letter-spacing: .4px; }
.stat-value { font-size: 24px; font-weight: 700; color: var(--azul-900); }
.stat-value.warn { color: var(--ambar); }
.stat-value.danger { color: var(--rojo); }
.stat-value.ok { color: var(--verde); }
.stat-sub { font-size: 12.5px; color: var(--gris-500); }

/* --------------------------- Tablas ------------------------------- */
.table-wrap { overflow-x: auto; }
table.tabla { width: 100%; border-collapse: collapse; font-size: 14px; }
table.tabla th, table.tabla td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--gris-200); vertical-align: middle; }
table.tabla thead th {
    background: var(--gris-50);
    font-size: 12.5px;
    text-transform: uppercase;
    letter-spacing: .3px;
    color: var(--gris-700);
    position: sticky;
    top: 0;
}
table.tabla tbody tr:hover { background: var(--azul-100); }
table.tabla tfoot td { font-weight: 700; background: var(--gris-50); }
table.tabla .num { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
table.tabla .center { text-align: center; }
.tabla .acciones { display: flex; gap: 6px; flex-wrap: wrap; }

/* --------------------------- Formularios -------------------------- */
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.form-grid .full { grid-column: 1 / -1; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: 13px; font-weight: 600; color: var(--gris-700); }
.field .hint { font-size: 12px; color: var(--gris-500); }

input[type=text], input[type=number], input[type=password], input[type=email],
input[type=date], input[type=search], select, textarea {
    width: 100%;
    padding: 9px 11px;
    border: 1px solid var(--gris-300);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    background: #fff;
    color: var(--gris-900);
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--azul-500);
    box-shadow: 0 0 0 3px rgba(43,142,222,.18);
}
input[readonly], input:disabled, select:disabled { background: var(--gris-100); color: var(--gris-500); }
textarea { resize: vertical; min-height: 70px; }

.filtros { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; }
.filtros .field { min-width: 150px; }
.filtros .field.wide { min-width: 220px; }

.form-actions { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }

/* --------------------------- Badges ------------------------------- */
.badge {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 11.5px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .3px;
}
.badge-admin { background: var(--azul-100); color: var(--azul-700); }
.badge-op { background: var(--gris-200); color: var(--gris-700); }
.badge-ok { background: var(--verde-bg); color: #15803d; }
.badge-off { background: var(--gris-200); color: var(--gris-500); }
.badge-warn { background: var(--ambar-bg); color: #b45309; }
.badge-danger { background: var(--rojo-bg); color: #b91c1c; }
.badge-info { background: var(--celeste-bg); color: var(--azul-700); }

/* --------------------------- Alertas ------------------------------ */
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 14px; border: 1px solid transparent; }
.alert-success { background: var(--verde-bg); color: #166534; border-color: #bbf7d0; }
.alert-danger { background: var(--rojo-bg); color: #991b1b; border-color: #fecaca; }
.alert-warn { background: var(--ambar-bg); color: #92400e; border-color: #fde68a; }
.alert-info { background: var(--celeste-bg); color: #075985; border-color: #bae6fd; }

/* --------------------------- Varios ------------------------------- */
.toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.toolbar .spacer { flex: 1 1 auto; }

.text-muted { color: var(--gris-500); }
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-danger { color: var(--rojo); }
.text-success { color: var(--verde); }
.text-warn { color: var(--ambar); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mb-16 { margin-bottom: 16px; }
.nowrap { white-space: nowrap; }
.strong { font-weight: 700; }

.pagination { display: flex; gap: 6px; justify-content: center; padding: 14px; margin: 0; list-style: none; }
.pagination a, .pagination span {
    padding: 6px 11px;
    border: 1px solid var(--gris-300);
    border-radius: 7px;
    font-size: 13.5px;
    background: #fff;
}
.pagination .current { background: var(--azul-600); color: #fff; border-color: var(--azul-600); font-weight: 700; }
.pagination .disabled { color: var(--gris-300); }

.empty { padding: 36px 18px; text-align: center; color: var(--gris-500); }
.empty .big { font-size: 34px; display: block; margin-bottom: 8px; }

/* Login */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px;
    background: linear-gradient(135deg, var(--azul-900), var(--azul-600)); }
.login-card { width: 100%; max-width: 380px; background: #fff; border-radius: 14px; box-shadow: var(--sombra-lg); padding: 30px 28px; }
.login-brand { text-align: center; margin-bottom: 22px; }
.login-brand .ico { font-size: 40px; display: block; }
.login-brand h1 { margin: 6px 0 2px; font-size: 24px; color: var(--azul-900); }
.login-brand p { margin: 0; color: var(--gris-500); font-size: 13.5px; }
.login-card .field { margin-bottom: 14px; }
.login-demo { margin-top: 18px; font-size: 12.5px; color: var(--gris-500); background: var(--gris-50);
    border: 1px dashed var(--gris-300); border-radius: 8px; padding: 10px 12px; text-align: center; }

/* Filas de items (compras/ventas) */
.item-row { display: grid; grid-template-columns: 2.4fr 1fr 1fr 1fr auto; gap: 8px; align-items: start; margin-bottom: 8px; }
.item-row > input, .item-row > .subtotal-cell, .item-row > .btn-icon { margin-top: 1px; }
.item-row .item-prod { display: flex; flex-direction: column; gap: 2px; }
.item-row .item-prod .item-stock { font-size: 12px; min-height: 15px; }
.item-row .subtotal-cell { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; padding-top: 9px; }
.item-row .btn-icon { align-self: start; margin-top: 4px; }
.items-head { display: grid; grid-template-columns: 2.4fr 1fr 1fr 1fr auto; gap: 8px; font-size: 12.5px; color: var(--gris-700); font-weight: 600; text-transform: uppercase; letter-spacing: .3px; margin-bottom: 8px; }
.items-head .r { text-align: right; }
.items-total { display: flex; justify-content: flex-end; gap: 16px; align-items: baseline; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--gris-200); font-size: 18px; font-weight: 700; color: var(--azul-900); }
@media (max-width: 760px) { .items-head { display: none; } }
@media (max-width: 760px) {
    .item-row { grid-template-columns: 1fr 1fr; }
    .item-row .subtotal-cell { text-align: left; }
}

/* Barra de progreso de stock */
.stock-bar { height: 7px; background: var(--gris-200); border-radius: 999px; overflow: hidden; min-width: 70px; }
.stock-bar > span { display: block; height: 100%; background: var(--verde); }
.stock-bar.low > span { background: var(--ambar); }
.stock-bar.crit > span { background: var(--rojo); }

/* Comprobantes agrupados */
.docs { display: flex; flex-direction: column; gap: 10px; padding: 14px; }
.doc { border: 1px solid var(--gris-200); border-radius: 10px; overflow: hidden; background: #fff; }
.doc > summary { list-style: none; cursor: pointer; display: flex; gap: 18px; align-items: center; flex-wrap: wrap; padding: 12px 14px; background: var(--gris-50); }
.doc > summary::-webkit-details-marker { display: none; }
.doc > summary::before { content: "\25B8"; color: var(--gris-500); }
.doc[open] > summary::before { content: "\25BE"; }
.doc[open] > summary { border-bottom: 1px solid var(--gris-200); }
.doc-campo { display: flex; flex-direction: column; }
.doc-campo .lbl { font-size: 11px; text-transform: uppercase; letter-spacing: .3px; color: var(--gris-500); }
.doc-campo .val { font-weight: 600; }
.doc .doc-total { margin-left: auto; font-weight: 700; font-size: 16px; color: var(--azul-900); }

.badge-especial { background: #ede9fe; color: #6d28d9; }
.res-pos { color: var(--verde); font-weight: 700; }
.res-neg { color: var(--rojo); font-weight: 700; }

/* Responsive */
@media (max-width: 1000px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 860px) {
    .sidebar { position: fixed; left: 0; top: 0; z-index: 60; transform: translateX(-100%); transition: transform .2s; }
    body.nav-open .sidebar { transform: translateX(0); }
    body.nav-open::after { content: ""; position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 50; }
    .menu-toggle { display: block; }
    .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: 1fr; }
    .content { padding: 16px; }
}
@media print {
    .sidebar, .topbar, .footer, .no-print { display: none !important; }
    body { background: #fff; }
    .layout { display: block; }
    .content { padding: 0; }
    .card { box-shadow: none; border: 1px solid #ccc; }
}