:root {
  --azul: #0b4f8a;
  --azul-osc: #083a66;
  --azul-claro: #e8f1f9;
  --gris: #64748b;
  --gris-claro: #f1f5f9;
  --borde: #e2e8f0;
  --texto: #1e293b;
  --verde: #16a34a;
  --rojo: #dc2626;
  --naranja: #ea580c;
  --sombra: 0 1px 3px rgba(15, 23, 42, .08), 0 1px 2px rgba(15, 23, 42, .04);
  --radio: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--texto);
  background: #f8fafc;
  font-size: 15px;
  line-height: 1.5;
}

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

/* ---------------- Catálogo público ---------------- */
.topbar {
  background: var(--azul);
  color: #fff;
  padding: 14px 28px;
  display: flex;
  align-items: center;
  gap: 24px;
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar .marca { font-size: 20px; font-weight: 700; letter-spacing: .3px; }
.topbar .marca span { opacity: .8; font-weight: 400; }
.topbar .crecer { flex: 1; }
.topbar a.admin-link {
  color: #fff;
  border: 1px solid rgba(255,255,255,.45);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
}
.topbar a.admin-link:hover { background: rgba(255,255,255,.12); text-decoration: none; }

.buscador-wrap { background: #fff; border-bottom: 1px solid var(--borde); padding: 18px 28px; }
.buscador {
  display: flex; gap: 10px; max-width: 920px; margin: 0 auto;
}
.buscador input[type=search] {
  flex: 1; padding: 13px 18px; border: 1px solid var(--borde);
  border-radius: var(--radio); font-size: 16px; outline: none;
}
.buscador input[type=search]:focus { border-color: var(--azul); box-shadow: 0 0 0 3px var(--azul-claro); }
.buscador button {
  padding: 13px 26px; background: var(--azul); color: #fff; border: 0;
  border-radius: var(--radio); font-size: 15px; cursor: pointer; font-weight: 600;
}
.buscador button:hover { background: var(--azul-osc); }
.buscador .spinner {
  width: 20px; height: 20px; align-self: center; margin-left: 4px;
  border: 3px solid var(--borde); border-top-color: var(--azul);
  border-radius: 50%; animation: girar .7s linear infinite;
}
@keyframes girar { to { transform: rotate(360deg); } }
.grid-productos.cargando { opacity: .45; transition: opacity .15s; }

.contenedor { max-width: 1400px; margin: 0 auto; padding: 24px 28px 60px; }
.layout { display: grid; grid-template-columns: 240px 1fr; gap: 28px; align-items: start; }

.categorias { background: #fff; border: 1px solid var(--borde); border-radius: var(--radio); padding: 8px; position: sticky; top: 84px; }
.categorias h3 { font-size: 12px; text-transform: uppercase; letter-spacing: .6px; color: var(--gris); margin: 12px 12px 8px; }
.categoria-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 9px 12px; border-radius: 7px; color: var(--texto); font-size: 14px;
}
.categoria-item:hover { background: var(--gris-claro); text-decoration: none; }
.categoria-item.activa { background: var(--azul-claro); color: var(--azul-osc); font-weight: 600; }
.categoria-item .n { background: var(--gris-claro); color: var(--gris); font-size: 12px; padding: 1px 8px; border-radius: 20px; }
.categoria-item.activa .n { background: #fff; color: var(--azul); }

.resultados-info { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 16px; color: var(--gris); font-size: 14px; }
.resultados-info strong { color: var(--texto); }

.grid-productos {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(215px, 1fr));
  gap: 18px;
}
.tarjeta {
  background: #fff; border: 1px solid var(--borde); border-radius: var(--radio);
  overflow: hidden; display: flex; flex-direction: column; cursor: pointer;
  transition: box-shadow .15s, transform .15s;
}
.tarjeta:hover { box-shadow: 0 6px 18px rgba(15, 23, 42, .12); transform: translateY(-2px); }
.tarjeta .foto { height: 180px; background: #fff; display: flex; align-items: center; justify-content: center; border-bottom: 1px solid var(--borde); overflow: hidden; }
.tarjeta .foto img { width: 100%; height: 100%; object-fit: contain; padding: 8px; }
.tarjeta .cuerpo { padding: 12px 14px 16px; display: flex; flex-direction: column; gap: 4px; flex: 1; }
.tarjeta .nombre { font-weight: 600; font-size: 14px; line-height: 1.35; min-height: 38px; }
.tarjeta .codigo { font-size: 12px; color: var(--gris); }
.tarjeta .marca { font-size: 12px; color: var(--gris); }
.tarjeta .precio { margin-top: auto; font-size: 18px; font-weight: 700; color: var(--azul-osc); }
.tarjeta .cat-badge { font-size: 11px; color: var(--azul); background: var(--azul-claro); padding: 2px 8px; border-radius: 12px; align-self: flex-start; }

.vacio { background: #fff; border: 1px dashed var(--borde); border-radius: var(--radio); padding: 60px 20px; text-align: center; color: var(--gris); }

.paginacion { display: flex; gap: 6px; justify-content: center; margin-top: 28px; flex-wrap: wrap; }
.paginacion a, .paginacion span {
  min-width: 38px; text-align: center; padding: 8px 12px; border: 1px solid var(--borde);
  border-radius: 7px; background: #fff; font-size: 14px;
}
.paginacion .actual { background: var(--azul); color: #fff; border-color: var(--azul); }

/* Modal detalle */
.modal-fondo { position: fixed; inset: 0; background: rgba(15,23,42,.55); display: none; align-items: center; justify-content: center; z-index: 50; padding: 20px; }
.modal-fondo.abierto { display: flex; }
.modal {
  background: #fff; border-radius: 14px; max-width: 820px; width: 100%; max-height: 90vh;
  overflow: auto; display: grid; grid-template-columns: 1fr 1fr;
}
.modal .modal-foto { background: #fff; display: flex; align-items: center; justify-content: center; padding: 24px; border-right: 1px solid var(--borde); }
.modal .modal-foto img { max-width: 100%; max-height: 380px; object-fit: contain; }
.modal .modal-info { padding: 28px; }
.modal h2 { margin: 0 0 6px; font-size: 22px; }
.modal .modal-precio { font-size: 28px; font-weight: 700; color: var(--azul-osc); margin: 14px 0; }
.modal dl { display: grid; grid-template-columns: 110px 1fr; gap: 8px 12px; margin: 0; font-size: 14px; }
.modal dt { color: var(--gris); }
.modal dd { margin: 0; }
.modal .cerrar { position: absolute; top: 14px; right: 18px; font-size: 26px; cursor: pointer; color: #fff; }

/* ---------------- Admin ---------------- */
.admin-layout { display: grid; grid-template-columns: 235px 1fr; min-height: 100vh; }
.sidebar { background: #0f172a; color: #cbd5e1; padding: 18px 14px; }
.sidebar .logo { color: #fff; font-weight: 700; font-size: 17px; padding: 8px 10px 18px; }
.sidebar .logo small { display: block; font-weight: 400; color: #64748b; font-size: 11px; letter-spacing: .5px; }
.sidebar nav a {
  display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 8px;
  color: #cbd5e1; font-size: 14px; margin-bottom: 3px;
}
.sidebar nav a:hover { background: rgba(255,255,255,.06); text-decoration: none; color: #fff; }
.sidebar nav a.activo { background: var(--azul); color: #fff; }
.sidebar .pie { margin-top: 24px; padding: 12px; border-top: 1px solid rgba(255,255,255,.08); font-size: 12px; color: #64748b; }
.sidebar .pie a { color: #93c5fd; display: block; margin-bottom: 6px; }

.admin-main { display: flex; flex-direction: column; }
.admin-header {
  background: #fff; border-bottom: 1px solid var(--borde); padding: 16px 28px;
  display: flex; align-items: center; justify-content: space-between;
}
.admin-header h1 { font-size: 20px; margin: 0; }
.admin-header .usuario { font-size: 13px; color: var(--gris); }
.admin-contenido { padding: 24px 28px 60px; }

.tarjetas-stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 16px; margin-bottom: 26px; }
.stat { background: #fff; border: 1px solid var(--borde); border-radius: var(--radio); padding: 18px 20px; }
.stat .valor { font-size: 30px; font-weight: 700; color: var(--azul-osc); }
.stat .etiqueta { color: var(--gris); font-size: 13px; margin-top: 2px; }

.panel { background: #fff; border: 1px solid var(--borde); border-radius: var(--radio); overflow: hidden; margin-bottom: 24px; }
.panel-cab { padding: 14px 20px; border-bottom: 1px solid var(--borde); display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.panel-cab h2 { font-size: 16px; margin: 0; }
.panel-cuerpo { padding: 20px; }

.tabla { width: 100%; border-collapse: collapse; font-size: 14px; }
.tabla th { text-align: left; padding: 11px 14px; background: var(--gris-claro); color: var(--gris); font-size: 12px; text-transform: uppercase; letter-spacing: .4px; border-bottom: 1px solid var(--borde); }
.tabla td { padding: 11px 14px; border-bottom: 1px solid var(--borde); vertical-align: middle; }
.tabla tr:hover td { background: #fafcff; }
.tabla .miniatura { width: 46px; height: 46px; object-fit: contain; border: 1px solid var(--borde); border-radius: 6px; background: #fff; }
.tabla .acciones { display: flex; gap: 6px; flex-wrap: wrap; }

.btn { display: inline-block; padding: 8px 15px; border-radius: 7px; border: 1px solid var(--borde); background: #fff; color: var(--texto); cursor: pointer; font-size: 13px; font-weight: 500; line-height: 1.2; }
.btn:hover { background: var(--gris-claro); text-decoration: none; }
.btn-primario { background: var(--azul); border-color: var(--azul); color: #fff; }
.btn-primario:hover { background: var(--azul-osc); color: #fff; }
.btn-peligro { background: #fff; border-color: #fecaca; color: var(--rojo); }
.btn-peligro:hover { background: #fef2f2; }
.btn-sm { padding: 5px 10px; font-size: 12px; }

.filtros { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.filtros input, .filtros select { padding: 9px 12px; border: 1px solid var(--borde); border-radius: 7px; font-size: 14px; background: #fff; }
.filtros input[type=text], .filtros input[type=search] { min-width: 240px; }

.alerta { padding: 12px 16px; border-radius: 8px; margin-bottom: 18px; font-size: 14px; border: 1px solid; }
.alerta-ok { background: #f0fdf4; border-color: #bbf7d0; color: #166534; }
.alerta-error { background: #fef2f2; border-color: #fecaca; color: #991b1b; }

.formulario { max-width: 720px; }
.campo { margin-bottom: 16px; }
.campo label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; }
.campo input, .campo select, .campo textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--borde); border-radius: 7px;
  font-size: 14px; font-family: inherit; background: #fff;
}
.campo textarea { min-height: 80px; resize: vertical; }
.campo .ayuda { font-size: 12px; color: var(--gris); margin-top: 4px; }
.fila-campos { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.vista-previa { max-width: 160px; max-height: 160px; object-fit: contain; border: 1px solid var(--borde); border-radius: 8px; background: #fff; padding: 6px; display: block; margin-bottom: 8px; }

.login-fondo { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #0f172a, #0b4f8a); padding: 20px; }
.login-caja { background: #fff; border-radius: 14px; padding: 36px; width: 100%; max-width: 400px; box-shadow: 0 20px 50px rgba(0,0,0,.3); }
.login-caja h1 { margin: 0 0 4px; font-size: 22px; }
.login-caja p.sub { margin: 0 0 24px; color: var(--gris); font-size: 14px; }
.login-caja .btn { width: 100%; padding: 12px; font-size: 15px; }

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .categorias { position: static; }
  .modal { grid-template-columns: 1fr; }
  .admin-layout { grid-template-columns: 1fr; }
  .sidebar { display: flex; flex-wrap: wrap; gap: 4px; }
  .sidebar .logo { width: 100%; }
  .fila-campos { grid-template-columns: 1fr; }
}