popup/popup.css

* { box-sizing: border-box; margin: 0; padding: 0; }
body { width: 350px; min-height: 200px; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background: #fff; color: #1a1a1a; }
header { background: #2d5be3; color: #fff; padding: 12px 16px; }
header h1 { font-size: 14px; font-weight: 600; }
.content { padding: 16px; }
.btn { display: inline-block; background: #2d5be3; color: #fff; border: none; border-radius: 6px; padding: 8px 16px; font-size: 13px; cursor: pointer; width: 100%; text-align: center; }
.btn:hover { background: #1a3fa8; }
.result { margin-top: 12px; padding: 10px; background: #f5f7ff; border-radius: 6px; font-size: 12px; }
.upgrade { display: block; text-align: center; margin-top: 10px; font-size: 11px; color: #888; text-decoration: none; }
.upgrade:hover { color: #2d5be3; }