:root{
    --marron:#8b6f47;
    --beige:#f4ede4;
    --beige-card:#fff9f3;
    --accent:#b29366;
    --muted:#5a4326;
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }

  body {
    font-family: 'Poppins', system-ui, Arial;
    background: var(--beige);
    color: #4b3b2b;
  }

  /* Sidebar */
  .sidebar {
    position: fixed;
    left:0; top:0; bottom:0;
    width:220px;
    background: linear-gradient(180deg,var(--marron) 0%, #b48a5a 100%);
    color:white;
    padding:18px 12px;
    box-shadow: 2px 0 12px rgba(0,0,0,0.12);
    transition: transform 0.3s ease;
    z-index: 1000;
  }
  .sidebar.active {
    transform: translateX(0);
  }

  .sidebar .logo { width:48px; display:block; margin:0 auto 10px; }
  .sidebar nav ul { list-style:none; padding:0; margin:12px 0 0 0; }
  .sidebar nav a {
    color:white; text-decoration:none; display:block; padding:10px 8px;
    border-radius:8px; margin-bottom:6px; font-weight:600;
  }
  .sidebar nav a:hover { background: rgba(255,255,255,0.08); }

  /* Toggle button */
  #menu-toggle {
    display: none;
    font-size: 1.8rem;
    cursor: pointer;
    position: fixed;
    top: 12px; 
    left: 12px;
    z-index: 1100;
    color: var(--marron-dark);
    background: transparent;
    border: none;
    padding: 5px;
  }

  /* Main content */
  .main-content {
    margin-left:220px;
    padding:28px;
    transition: margin-left 0.3s ease;
  }

  /* Donaciones Card */
  .donaciones-card {
    background: var(--beige-card);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 6px 14px rgba(0,0,0,0.15);
    max-width: 600px;
    margin: 0 auto;
  }

  h1 { text-align:center; margin-bottom:15px; }
  p { text-align:center; margin-bottom:15px; }

  input[type="text"], input[type="email"] {
    width:100%; padding:10px; margin-top:8px; border:1px solid #ccc; border-radius:5px;
  }

  label { display:block; margin:10px 0; cursor:pointer; }

  .btn-pago {
    display: block;
    width: 100%;
    max-width: 300px;
    margin: 15px auto;
    padding: 12px;
    font-weight: bold;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    text-align:center;
    text-decoration:none;
    transition: background 0.3s ease;
  }

  .btn-mercadopago { background: #009EE3; }
  .btn-mercadopago:hover { background: #007bbd; }

  .btn-paypal { background: #003087; }
  .btn-paypal:hover { background: #001f50; }

  /* Selector de instituciones */
  .selector-refugio {
    margin: 15px 0;
  }

  .lista-instituciones {
    max-height: 300px;
    overflow-y: auto;
    border: 1px solid #ddd;
    border-radius: 8px;
    background: white;
    padding: 8px;
  }

  .institucion-item {
    display: flex;
    align-items: center;
    padding: 12px;
    margin-bottom: 8px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: white;
  }

  .institucion-item:hover {
    border-color: var(--accent);
    background: #fafafa;
    transform: translateX(4px);
  }

  .institucion-item.selected {
    border-color: var(--marron);
    background: var(--beige);
    box-shadow: 0 2px 8px rgba(139, 111, 71, 0.2);
  }

  .institucion-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 12px;
    object-fit: cover;
    border: 2px solid var(--accent);
    flex-shrink: 0;
  }

  .institucion-info {
    flex: 1;
  }

  .institucion-nombre {
    font-weight: 600;
    color: var(--muted);
    margin-bottom: 2px;
  }

  .institucion-email {
    font-size: 0.85rem;
    color: #888;
  }

  /* Tooltip */
  .tooltip { position: relative; display: inline-block; width: 100%; }
  .tooltip .tooltiptext {
    visibility: hidden;
    width: 280px;
    background-color: #333;
    color: #fff;
    text-align:center;
    border-radius:6px;
    padding:6px;
    position:absolute;
    z-index:10;
    bottom:125%;
    left:50%;
    transform:translateX(-50%);
    opacity:0;
    transition: opacity 0.3s;
    font-size:0.85rem;
  }
  .tooltip .tooltiptext::after {
    content:"";
    position:absolute;
    top:100%;
    left:50%;
    margin-left:-5px;
    border-width:5px;
    border-style:solid;
    border-color:#333 transparent transparent transparent;
  }
  .tooltip input:disabled:hover + .tooltiptext {
    visibility: visible; opacity:1;
  }

  /* Responsive */
  @media(max-width:768px){
    .sidebar { 
      transform: translateX(-100%); 
      position:fixed;
      top: 0;
      left: 0;
      bottom: 0;
      z-index: 1000;
      width: 220px;
    }
    .sidebar.active { 
      transform: translateX(0);
      box-shadow: 4px 0 20px rgba(0,0,0,0.3);
    }
    
    #menu-toggle { 
      display: flex !important;
      position: fixed;
      top: 18px;
      left: 18px;
      z-index: 1100;
      background: rgba(255, 255, 255, 0.9);
      width: 45px;
      height: 45px;
      border-radius: 10px;
      align-items: center;
      justify-content: center;
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
      transition: all 0.3s ease;
      color: var(--marron-dark);
      font-size: 1.8rem;
      cursor: pointer;
      border: none;
      padding: 0;
    }

    #menu-toggle:hover {
      background: rgba(255, 255, 255, 1);
      transform: scale(1.05);
    }
    
    .main-content { 
      margin-left:0; 
      padding: 70px 20px 20px 20px; 
    }
  }