.sd-wrapper{display:flex;max-width:1200px;margin:30px auto;background:#fff;border-radius:10px;overflow:hidden;box-shadow:0 6px 20px rgba(0,0,0,0.08)}
.sd-sidebar{width:220px;background:#0d6efd;color:#fff;padding:18px}
.sd-sidebar ul{list-style:none;margin:0;padding:0}
.sd-sidebar li,.sd-sidebar a{display:block;padding:10px;border-radius:6px;color:#fff;text-decoration:none;margin-bottom:6px;cursor:pointer}
.sd-sidebar li.active,.sd-sidebar li:hover{background:#084298}
.sd-content{flex:1;padding:24px}
.sd-section{display:none}
.sd-section.active{display:block}
.sd-table{width:100%;border-collapse:collapse}
.sd-table th,.sd-table td{border:1px solid #eee;padding:8px;text-align:left}
.sd-join{display:inline-block;padding:8px 12px;background:#198754;color:#fff;border-radius:6px;text-decoration:none}
.sd-join-large{display:inline-block;padding:12px 18px;background:#0d6efd;color:#fff;border-radius:8px;text-decoration:none;font-weight:600}
.sd-btn{background:#0d6efd;color:#fff;padding:8px 12px;border-radius:6px;border:none;cursor:pointer}