* { box-sizing: border-box; margin: 0; padding: 0; font-family: system-ui, -apple-system, sans-serif; }
body { background-color: #f4f4f9; color: #333; -webkit-font-smoothing: antialiased; }

.banner {
    width: 100%;
    max-height: 180px;
    object-fit: cover;
    display: block;
    background-color: #1a1a1a;
}

#app-container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

h2 { margin-bottom: 1.5rem; text-align: center; color: #2c3e50; }

form { display: flex; flex-direction: column; gap: 1rem; }
input { padding: 1rem; border: 1px solid #ddd; border-radius: 8px; font-size: 1rem; }
input:focus { outline: none; border-color: #0056b3; }

button { padding: 1rem; border: none; background: #0056b3; color: white; border-radius: 8px; cursor: pointer; font-size: 1rem; font-weight: bold; transition: background 0.2s;}
button:hover { background: #004494; }

.error-msg { color: #d9534f; text-align: center; font-size: 0.9rem; font-weight: 500; height: 1.2rem;}
.hidden { display: none !important; }

#logout-btn { background: #dc3545; margin-top: 2rem; width: 100%; }
#logout-btn:hover { background: #c82333; }

#dashboard-content { padding: 1rem 0; border-top: 1px solid #eee; text-align: center; }

/* Adaptación fluida para celulares (iPhone y Android) */
@media (max-width: 600px) {
    #app-container { margin: 1rem; width: calc(100% - 2rem); padding: 1.5rem; }
}