.sac-th-wrap{max-width:720px;margin:20px auto;padding:18px;border:1px solid #eee;border-radius:8px;box-shadow:0 6px 18px rgba(0,0,0,0.03);font-family:Arial,Helvetica,sans-serif;}
.sac-brand{margin:0 0 12px;font-size:18px;color:#222;text-align:left;}
.sac-input-wrap{display:flex;justify-content:center;margin-bottom:12px;}
#sac-username{width:90%;padding:12px 14px;border-radius:6px;border:1px solid #ccc;font-size:16px;}
.sac-button-wrap{text-align:center;margin-bottom:12px;}
#sac-check-btn{padding:10px 26px;border-radius:8px;border:0;background:#0073aa;color:#fff;font-size:15px;cursor:pointer;}
#sac-check-btn:hover{opacity:0.95;}
.sac-spinner{width:48px;height:48px;margin:10px auto;border:6px solid rgba(0,0,0,0.08);border-top-color:#0073aa;border-radius:50%;animation:sac-spin 1s linear infinite;}
@keyframes sac-spin{from{transform:rotate(0)}to{transform:rotate(360deg)}}
.sac-result{margin-top:12px;padding:12px;border-radius:6px;background:#fafafa;border:1px solid #eee;}
.sac-result p{margin:6px 0;font-size:15px;}
.sac-error{color:#b00020;font-weight:600;}
.sac-note{font-size:13px;color:#666;margin-top:8px;}