:root {
  --azul-oscuro:  #0D2B6B;
  --azul-medio:   #1A4BAA;
  --azul-claro:   #3B7DD8;
  --naranja:      #F47920;
  --naranja-dark: #D4610A;
  --blanco:       #FFFFFF;
  --gris-claro:   #F0F4FA;
  --gris-borde:   #D0DCF0;
  --texto-dark:   #1A2340;
}

/* ── Layout ── */
body {
  background: var(--gris-claro);
  color: var(--texto-dark);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
}

/* ── Navbar ── */
.navbar-byl {
  background: linear-gradient(135deg, var(--azul-oscuro) 0%, var(--azul-medio) 100%);
  box-shadow: 0 2px 8px rgba(13,43,107,0.4);
  padding: 0.5rem 1.5rem;
}
.navbar-byl .navbar-brand img { height: 44px; }
.navbar-byl .navbar-brand span {
  color: var(--blanco);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: 0.5px;
}
.navbar-byl .nav-link { color: rgba(255,255,255,0.85) !important; font-size: 0.9rem; }
.navbar-byl .nav-link:hover { color: var(--naranja) !important; }
.navbar-byl .nav-link.active { color: var(--naranja) !important; font-weight: 600; }
.navbar-byl .dropdown-menu {
  border: none;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  border-radius: 8px;
}
.navbar-byl .dropdown-item:hover { background: var(--gris-claro); color: var(--azul-medio); }

/* ── Sidebar ── */
.sidebar {
  background: var(--blanco);
  border-right: 1px solid var(--gris-borde);
  height: calc(100vh - 60px);
  width: 220px;
  position: fixed;
  top: 60px;
  left: 0;
  padding: 0.5rem 0 1.5rem;
  z-index: 100;
  overflow-y: auto;
  overflow-x: hidden;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--gris-borde); border-radius: 2px; }

.sidebar .nav-link {
  color: var(--texto-dark);
  padding: 0.42rem 1.2rem 0.42rem 1.5rem;
  font-size: 0.84rem;
  border-left: 3px solid transparent;
  transition: all 0.2s;
  display: flex;
  align-items: center;
}
.sidebar .nav-link:hover {
  background: var(--gris-claro);
  border-left-color: var(--azul-claro);
  color: var(--azul-medio);
}
.sidebar .nav-link.active {
  background: linear-gradient(90deg, rgba(59,125,216,0.12), transparent);
  border-left-color: var(--naranja);
  color: var(--azul-oscuro);
  font-weight: 600;
}
/* Botón de sección colapsable */
.sidebar .nav-section-btn {
  display: flex;
  align-items: center;
  width: 100%;
  background: none;
  border: none;
  border-top: 1px solid var(--gris-borde);
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.9px;
  color: #8899BB;
  padding: 0.6rem 1rem 0.6rem 1.5rem;
  cursor: pointer;
  text-align: left;
  transition: color 0.15s, background 0.15s;
  gap: 6px;
}
.sidebar .nav-section-btn:hover { color: var(--azul-medio); background: var(--gris-claro); }
.sidebar .nav-section-btn .nav-sec-icon { color: var(--azul-claro); font-size: 0.75rem; }
.sidebar .nav-section-btn .nav-chev {
  margin-left: auto;
  font-size: 0.62rem;
  transition: transform 0.2s;
  color: #aabbd0;
}
.sidebar .nav-section-btn[aria-expanded="true"] { color: var(--azul-medio); }
.sidebar .nav-section-btn[aria-expanded="true"] .nav-chev { transform: rotate(90deg); }
.sidebar .nav-section-btn[aria-expanded="true"] .nav-sec-icon { color: var(--naranja); }
/* Links fijos (sin sección) */
.sidebar .nav-fixed { border-bottom: 1px solid var(--gris-borde); padding-bottom: 0.25rem; margin-bottom: 0; }
.sidebar .nav-link i { width: 20px; margin-right: 8px; color: var(--azul-claro); flex-shrink: 0; }
.sidebar .nav-link.active i { color: var(--naranja); }

/* ── Main content ── */
.main-content {
  margin-left: 220px;
  padding: 1.5rem;
  min-height: calc(100vh - 66px);
}

/* ── Cards ── */
.card-byl {
  background: var(--blanco);
  border: 1px solid var(--gris-borde);
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(13,43,107,0.06);
}
.card-byl .card-header {
  background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-medio));
  color: var(--blanco);
  border-radius: 12px 12px 0 0 !important;
  padding: 0.85rem 1.25rem;
  font-weight: 600;
}
.card-byl .card-header .badge-naranja {
  background: var(--naranja);
  color: white;
}

/* ── Stat cards ── */
.stat-card {
  background: var(--blanco);
  border: 1px solid var(--gris-borde);
  border-radius: 12px;
  padding: 1.25rem;
  box-shadow: 0 2px 6px rgba(13,43,107,0.06);
  transition: transform 0.2s, box-shadow 0.2s;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: 0 6px 16px rgba(13,43,107,0.12); }
.stat-card .stat-icon {
  width: 48px; height: 48px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
}
.stat-icon-azul { background: rgba(59,125,216,0.15); color: var(--azul-medio); }
.stat-icon-naranja { background: rgba(244,121,32,0.15); color: var(--naranja); }
.stat-icon-verde { background: rgba(25,135,84,0.12); color: #198754; }
.stat-icon-rojo { background: rgba(220,53,69,0.12); color: #dc3545; }
.stat-card .stat-valor { font-size: 2rem; font-weight: 700; color: var(--azul-oscuro); line-height: 1; }
.stat-card .stat-label { font-size: 0.8rem; color: #6B7FA3; margin-top: 0.2rem; }

/* ── Botones ── */
.btn-azul {
  background: linear-gradient(135deg, var(--azul-medio), var(--azul-claro));
  border: none; color: white; font-weight: 600;
  border-radius: 8px; transition: all 0.2s;
}
.btn-azul:hover { background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-medio)); color: white; transform: translateY(-1px); }
.btn-naranja {
  background: linear-gradient(135deg, var(--naranja), var(--naranja-dark));
  border: none; color: white; font-weight: 600;
  border-radius: 8px; transition: all 0.2s;
}
.btn-naranja:hover { background: linear-gradient(135deg, var(--naranja-dark), #B85200); color: white; transform: translateY(-1px); }
.btn-outline-azul {
  border: 1.5px solid var(--azul-medio); color: var(--azul-medio);
  border-radius: 8px; font-weight: 500;
}
.btn-outline-azul:hover { background: var(--azul-medio); color: white; }
.btn-xs { padding: 0.15rem 0.45rem; font-size: 0.75rem; line-height: 1.3; border-radius: 5px; }

/* ── Tabla ── */
.tabla-byl { border-collapse: separate; border-spacing: 0; }
.tabla-byl thead tr { background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-medio)); }
.tabla-byl thead th { color: white; font-weight: 600; font-size: 0.82rem; padding: 0.75rem 0.8rem; border: none; }
.tabla-byl thead th:first-child { border-radius: 8px 0 0 0; }
.tabla-byl thead th:last-child  { border-radius: 0 8px 0 0; }
.tabla-byl tbody tr { background: white; transition: background 0.15s; }
.tabla-byl tbody tr:nth-child(even) { background: var(--gris-claro); }
.tabla-byl tbody tr:hover { background: rgba(59,125,216,0.08); }
.tabla-byl tbody td { padding: 0.6rem 0.8rem; font-size: 0.88rem; vertical-align: middle; border-bottom: 1px solid var(--gris-borde); }
.tabla-byl tfoot tr { background: rgba(13,43,107,0.06); }
.tabla-byl tfoot td { font-weight: 600; font-size: 0.88rem; padding: 0.65rem 0.8rem; border-top: 2px solid var(--gris-borde); }

/* ── Badges stock ── */
.badge-stock-ok    { background: rgba(25,135,84,0.12);  color: #146c43; border-radius: 6px; padding: 0.2rem 0.55rem; font-size: 0.8rem; }
.badge-stock-bajo  { background: rgba(255,193,7,0.18);  color: #997700; border-radius: 6px; padding: 0.2rem 0.55rem; font-size: 0.8rem; }
.badge-stock-cero  { background: rgba(220,53,69,0.12);  color: #b02a37; border-radius: 6px; padding: 0.2rem 0.55rem; font-size: 0.8rem; }

/* ── Código badge ── */
.badge-codigo {
  background: linear-gradient(135deg, var(--azul-oscuro), var(--azul-medio));
  color: white; border-radius: 6px;
  padding: 0.2rem 0.55rem; font-size: 0.78rem; font-weight: 700;
  font-family: monospace; letter-spacing: 0.5px;
}

/* ── Formularios ── */
.form-control, .form-select {
  border: 1.5px solid var(--gris-borde);
  border-radius: 8px;
  font-size: 0.9rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-control:focus, .form-select:focus {
  border-color: var(--azul-claro);
  box-shadow: 0 0 0 3px rgba(59,125,216,0.15);
}
.form-label { font-weight: 600; font-size: 0.85rem; color: var(--azul-oscuro); margin-bottom: 0.3rem; }
.input-group-text {
  background: var(--gris-claro);
  border: 1.5px solid var(--gris-borde);
  font-size: 0.9rem;
  color: var(--azul-medio);
}

/* ── Alerts ── */
.alert { border: none; border-radius: 10px; font-size: 0.9rem; }
.alert-success { background: rgba(25,135,84,0.1); color: #0a5e38; }
.alert-danger   { background: rgba(220,53,69,0.1); color: #842029; }
.alert-warning  { background: rgba(255,193,7,0.12); color: #856404; }
.alert-info     { background: rgba(13,110,253,0.1); color: #084298; }

/* ── Login ── */
.login-container {
  min-height: 100vh;
  background: linear-gradient(135deg, var(--azul-oscuro) 0%, var(--azul-medio) 50%, var(--azul-claro) 100%);
  display: flex; align-items: center; justify-content: center;
}
.login-card {
  background: white; border-radius: 16px;
  padding: 2.5rem 2rem; width: 100%; max-width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.25);
}
.login-card .logo-wrap { text-align: center; margin-bottom: 1.5rem; }
.login-card .logo-wrap img { height: 80px; }
.login-card h4 { color: var(--azul-oscuro); font-weight: 700; text-align: center; }
.login-card .subtitle { color: #6B7FA3; font-size: 0.88rem; text-align: center; margin-bottom: 1.5rem; }

/* ── Precio MUTRAMA ── */
.tabla-mutrama td:last-child { font-weight: 700; color: var(--naranja); font-size: 1rem; }
.tabla-mutrama td:nth-child(2) { color: var(--azul-medio); font-size: 0.95rem; }

/* ── Dólar display ── */
.dolar-badge {
  background: rgba(244,121,32,0.12);
  border: 1.5px solid var(--naranja);
  color: var(--naranja-dark);
  border-radius: 8px;
  padding: 0.3rem 0.8rem;
  font-weight: 700; font-size: 0.9rem;
  display: inline-flex; align-items: center; gap: 0.4rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .main-content { margin-left: 0; }
}