* { box-sizing: border-box; margin: 0; padding: 0; font-family: system-ui, sans-serif; }
body { background-color: #f4f6f8; display: flex; justify-content: center; align-items: center; min-height: 100vh; padding: 20px; }
.card { background: white; padding: 24px; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); width: 100%; max-width: 400px; }
h2, h3 { margin-bottom: 16px; color: #1e293b; }
input { width: 100%; padding: 10px; margin-bottom: 12px; border: 1px solid #cbd5e1; border-radius: 4px; }
button { width: 100%; padding: 10px; background-color: #2563eb; color: white; border: none; border-radius: 4px; cursor: pointer; font-weight: bold; }
button:hover { background-color: #1d4ed8; }
.hidden { display: none; }
.error { color: #dc2626; font-size: 14px; margin-top: 8px; }
header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 24px; }
header button { width: auto; padding: 6px 12px; background-color: #64748b; }
#dashboard-container { max-width: 800px; width: 100%; }
ul { margin-top: 12px; list-style-type: none; }
li { padding: 8px; border-bottom: 1px solid #e2e8f0; }