* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: Arial, sans-serif; background: #f5f5f5; padding: 10px; }
.container { max-width: 900px; margin: 0 auto; background: white; padding: 20px; border-radius: 8px; }
.header { text-align: center; margin-bottom: 20px; border-bottom: 2px solid #1e3a8a; padding-bottom: 10px; }
.header h2 { color: #1e3a8a; font-size: 18px; }
.header p { color: #666; font-size: 13px; margin-top: 5px; }
section { margin-bottom: 25px; padding: 15px; background: #f8f9fa; border-radius: 6px; }
h3 { color: #1e3a8a; font-size: 16px; margin-bottom: 15px; border-bottom: 1px solid #ddd; padding-bottom: 8px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 15px; }
label { display: block; font-weight: 600; font-size: 13px; margin-bottom: 5px; color: #333; }
input, textarea, select { width: 100%; padding: 8px; border: 1px solid #ddd; border-radius: 4px; font-size: 14px; }
input:focus, textarea:focus { outline: none; border-color: #1e3a8a; }
#signPad { border: 2px solid #ddd; border-radius: 4px; cursor: crosshair; display: block; width: 100%; max-width: 600px; height: 150px; }
#clearBtn { margin-top: 10px; padding: 6px 12px; background: #dc2626; color: white; border: none; border-radius: 4px; cursor: pointer; }
.btn-primary { width: 100%; padding: 12px; background: #1e3a8a; color: white; border: none; border-radius: 6px; font-size: 16px; font-weight: 600; cursor: pointer; margin-top: 20px; }
.btn-primary:hover { background: #172554; }
#msg { margin-top: 15px; padding: 12px; border-radius: 4px; text-align: center; display: none; }
#msg.success { background: #d1fae5; color: #065f46; border: 1px solid #059669; }
#msg.error { background: #fee2e2; color: #991b1b; border: 1px solid #dc2626; }
@media (max-width: 768px) {
  .container { padding: 15px; }
  .grid { grid-template-columns: 1fr; }
}