:root{
  --purple:#8A2BE2;
  --purple-dark:#5A189A;
  --black:#000;
  --bg:#f6f7fb;
  --card:#fff;
  --muted:#666;
  --radius:8px;
}

*{box-sizing:border-box}
body{margin:0;font-family:Arial, Helvetica, sans-serif;background:var(--bg);color:#111;line-height:1.4}
.site-header{display:flex;justify-content:space-between;align-items:center;padding:14px 18px;background:linear-gradient(90deg,var(--purple),var(--purple-dark));color:#fff}
.brand{display:flex;align-items:center;gap:12px}
.logo{width:44px;height:44px;background:var(--card);color:var(--purple-dark);display:flex;align-items:center;justify-content:center;border-radius:8px;font-weight:800}
.brand-title{font-weight:800}
.brand-sub{font-size:13px;opacity:0.95}

nav{display:flex;gap:8px;align-items:center}
nav button{background:transparent;border:1px solid rgba(255,255,255,0.18);color:white;padding:8px 12px;border-radius:6px;cursor:pointer}
nav button[aria-current="true"]{background:rgba(0,0,0,0.12)}

main{max-width:1100px;margin:18px auto;padding:0 14px}
.layout{display:grid;grid-template-columns:1fr 320px;gap:18px}
@media(max-width:900px){.layout{grid-template-columns:1fr}}

.card{background:var(--card);border-radius:var(--radius);padding:16px;box-shadow:0 6px 18px rgba(0,0,0,0.06)}
h3{margin:0 0 8px 0;color:var(--purple-dark)}
.small{font-size:13px;color:var(--muted)}

label{display:block;margin-top:8px;font-weight:600;color:var(--purple-dark)}
input[type="text"],input[type="email"],input[type="password"],input[type="date"],select{width:100%;padding:8px;border-radius:6px;border:1px solid #d1d5db;margin-top:6px}

.btn{background:var(--purple);color:white;border:none;padding:10px 12px;border-radius:6px;cursor:pointer;font-weight:700}
.btn.secondary{background:var(--purple-dark)}

.btn-row{display:flex;gap:8px;flex-wrap:wrap}

.sidebar{display:flex;flex-direction:column;gap:12px}

.product{display:flex;gap:12px;align-items:center;border:1px solid #eee;padding:10px;border-radius:8px}
.product img{width:84px;height:64px;object-fit:cover;border-radius:6px}
.product .info{flex:1}

#messages .card{margin:14px 0;border-left:4px solid var(--purple);padding:10px;background:#fff}

.site-footer{max-width:1100px;margin:18px auto;padding:10px 14px;color:var(--muted);font-size:13px}

/* focus visibility */
:focus{outline:3px solid rgba(138,43,226,0.18);outline-offset:2px}

/* ----------------------------------------------
   RESPONSIVE DESIGN – MOBILE (max-width: 768px)
   ---------------------------------------------- */
@media (max-width: 768px){

  /* Header */
  .site-header{
    flex-direction: column;
    text-align: center;
  }

  nav{
    width: 100%;
    overflow-x: auto;
    display: flex;
    gap: 6px;
    padding: 6px 0;
  }

  nav button{
    flex: 0 0 auto; /* permite scroll horizontal */
  }

  /* Layout → 1 columna */
  .layout{
    grid-template-columns: 1fr !important;
  }

  /* Sidebar debajo del contenido */
  .sidebar{
    order: 3;
    margin-top: 14px;
  }

  /* Cards ocupan 100% */
  .card{
    width: 100%;
  }

  /* Productos en lista vertical */
  .product{
    flex-direction: column;
    text-align: center;
  }

  .product img{
    width: 100%;
    height: auto;
  }

  /* Botones más grandes para tacto */
  .btn{
    padding: 12px;
    font-size: 16px;
  }

  /* Form inputs */
  input, select{
    font-size: 16px;
  }

  /* Catálogo grid */
  #catalogList{
    display: flex;
    flex-direction: column;
    gap: 14px;
  }

  /* Detalle producto */
  #content img{
    width: 100% !important;
  }

  /* Footer centrado */
  .site-footer{
    text-align: center;
    padding: 18px 0;
  }
}

/* ----------------------------------------------
   EXTRA – Breakpoint para pantallas muy pequeñas
   (max-width: 480px)
   ---------------------------------------------- */
@media (max-width: 480px){

  nav button{
    padding: 6px;
    font-size: 14px;
  }

  .brand-sub{
    font-size: 11px;
  }

  .btn{
    font-size: 14px;
    padding: 10px;
  }

  .product{
    padding: 10px;
  }
}
.hidden {
  display: none !important;
}