/* === ESTILOS GENERALES === */
:root {
  --color-primario: #2c3e50;
  --color-secundario: #3498db;
  --color-fondo: #f8f9fa;
  --color-texto: #333;
  --color-card: #fff;
  --borde-suave: rgba(0,0,0,0.1);
  --radio: 10px;
  --transicion: 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}

body {
  background: var(--color-fondo);
  color: var(--color-texto);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* === CABECERA === */
header {
  background: var(--color-primario);
  color: #fff;
  padding: 1rem 2rem;
  text-align: center;
  font-size: 1.4rem;
  font-weight: bold;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

/* === CONTENEDOR GENERAL === */
main {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
}

/* === TARJETAS DE PRODUCTOS === */
.productos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--color-card);
  border-radius: var(--radio);
  overflow: hidden;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  transition: transform var(--transicion), box-shadow var(--transicion);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}

.card-content {
  padding: 1rem;
}

.card h3 {
  font-size: 1.2rem;
  color: var(--color-primario);
  margin-bottom: 0.5rem;
}

.card p {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.card .precio {
  color: var(--color-secundario);
  font-weight: bold;
  font-size: 1.1rem;
}

/* === BOTONES === */
button, .btn {
  display: inline-block;
  background: var(--color-secundario);
  color: #fff;
  border: none;
  padding: 0.7rem 1.2rem;
  border-radius: var(--radio);
  cursor: pointer;
  transition: background var(--transicion);
  text-decoration: none;
}

button:hover, .btn:hover {
  background: #2178c7;
}

/* === ARTÍCULO INDIVIDUAL === */
.articulo-detalle {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  background: var(--color-card);
  padding: 1.5rem;
  border-radius: var(--radio);
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.articulo-detalle img {
  width: 100%;
  max-height: 300px;
  object-fit: cover;
  border-radius: var(--radio);
}

.articulo-info h2 {
  color: var(--color-primario);
  margin-bottom: 0.5rem;
}

.articulo-info .estado {
  font-size: 0.9rem;
  color: #777;
  margin-bottom: 0.5rem;
}

.articulo-info .precio {
  font-size: 1.3rem;
  color: var(--color-secundario);
  margin-bottom: 1rem;
}

/* === FORMULARIO DE CONTACTO / CHAT === */
.chat-container {
  margin-top: 2rem;
  background: var(--color-card);
  border-radius: var(--radio);
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
  padding: 1rem;
}

.chat-mensajes {
  max-height: 300px;
  overflow-y: auto;
  border-bottom: 1px solid var(--borde-suave);
  margin-bottom: 1rem;
  padding: 0.5rem;
}

.mensaje {
  margin-bottom: 0.8rem;
}

.mensaje.usuario {
  text-align: right;
}

.mensaje p {
  display: inline-block;
  background: #e8f1ff;
  padding: 0.6rem 0.9rem;
  border-radius: var(--radio);
  max-width: 75%;
}

.mensaje.usuario p {
  background: var(--color-secundario);
  color: #fff;
}

/* === PANEL ADMIN === */
.admin-container {
  background: var(--color-card);
  padding: 2rem;
  border-radius: var(--radio);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.admin-container h2 {
  text-align: center;
  color: var(--color-primario);
  margin-bottom: 1rem;
}

.admin-form {
  display: grid;
  gap: 1rem;
}

.admin-form input, 
.admin-form textarea, 
.admin-form select {
  width: 100%;
  padding: 0.8rem;
  border: 1px solid var(--borde-suave);
  border-radius: var(--radio);
  font-size: 1rem;
}

.admin-form input:focus, 
.admin-form textarea:focus, 
.admin-form select:focus {
  outline: none;
  border-color: var(--color-secundario);
}

/* === FOOTER === */
footer {
  background: var(--color-primario);
  color: #fff;
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
  margin-top: auto;
}

/* === RESPONSIVE === */
@media (min-width: 768px) {
  .articulo-detalle {
    flex-direction: row;
    align-items: flex-start;
  }

  .articulo-detalle img {
    width: 45%;
  }

  .articulo-info {
    width: 55%;
  }
}

@media (max-width: 500px) {
  header {
    font-size: 1.1rem;
    padding: 0.8rem;
  }

  .card h3 {
    font-size: 1rem;
  }

  .card img {
    height: 160px;
  }
}