:root{--bg:#f5f7fb;--surface:#fff;--line:#d8e0e8;--text:#102033;--muted:#617185;--primary:#0e6e6e;--primary-dark:#0b5757;--navy:#0d1b34;--success:#067647;--danger:#b42318;--shadow:0 18px 40px #0f172a14}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,textarea,select{font:inherit}.login-wrap{background:linear-gradient(135deg,#0d1b34,#174c5a);place-items:center;min-height:100vh;padding:2rem;display:grid}.panel{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:24px}.form{gap:1rem;display:grid}.form label{gap:.45rem;font-weight:600;display:grid}.form input,.form textarea,.form select{border:1px solid var(--line);border-radius:16px;width:100%;padding:.9rem 1rem}.eyebrow{color:#c5851d;text-transform:uppercase;letter-spacing:.08em;font-size:.78rem;font-weight:700}.muted{color:var(--muted)}.btn{cursor:pointer;border:0;border-radius:16px;padding:.85rem 1.1rem;font-weight:700}.btn.primary{background:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary-dark)}.btn.ghost{color:var(--navy);background:#eef5f7}.btn.logout{color:var(--navy);background:#fff;margin-top:auto}.alert{border-radius:16px;padding:.85rem 1rem}.alert.error{color:var(--danger);background:#fff1f0}.alert.success{color:var(--success);background:#ecfdf3}.dashboard-shell{grid-template-columns:260px 1fr;min-height:100vh;display:grid}.sidebar{color:#fff;background:linear-gradient(#0d1b34,#17304b);flex-direction:column;gap:.8rem;padding:1.5rem;display:flex}.nav-btn{text-align:left;color:#fff;cursor:pointer;background:#ffffff14;border:0;border-radius:16px;padding:.85rem 1rem}.nav-btn.active{background:#ffffff2e}.content{padding:1.5rem}.stat-grid{grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:1rem;display:grid}.stat{gap:.3rem;padding:1.2rem;display:grid}.stat strong{font-size:1.9rem}.panel-head{margin-bottom:1rem}.table-wrap{overflow:auto}table{border-collapse:collapse;width:100%}th,td{border-bottom:1px solid var(--line);text-align:left;vertical-align:top;padding:.9rem .75rem}.message-cell{min-width:260px}.course-grid{grid-template-columns:repeat(2,1fr);gap:1rem;display:grid}.course-card{border:1px solid var(--line);border-radius:20px;padding:1rem}.course-card h4{margin-top:0}.course-card p{color:var(--muted);line-height:1.65}.course-meta{flex-wrap:wrap;gap:.6rem;margin:.8rem 0 1rem;display:flex}.course-meta span{background:#eef5f7;border-radius:999px;padding:.4rem .7rem}.form-panel{padding:1.2rem}.cols{grid-template-columns:repeat(2,1fr);gap:1rem;display:grid}.checkbox-row{align-items:center;gap:.65rem;display:flex!important}.checkbox-row input{width:auto!important}.actions{flex-wrap:wrap;gap:.8rem;display:flex}@media (width<=920px){.dashboard-shell,.stat-grid,.course-grid,.cols{grid-template-columns:1fr}}