:root{--bg:#0f172a;--card:#111827;--muted:#94a3b8;--text:#e5e7eb;--brand:#7c3aed;--brand2:#06b6d4;--line:#1f2937;--ok:#22c55e;--danger:#ef4444;--warn:#f59e0b}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,Segoe UI,Arial;background:linear-gradient(135deg,#0f172a,#111827 45%,#18181b);color:var(--text);min-height:100vh}.wrap{max-width:1180px;margin:auto;padding:24px}.nav{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:26px}.logo{font-weight:900;font-size:24px;letter-spacing:-.5px}.logo span{background:linear-gradient(90deg,var(--brand),var(--brand2));-webkit-background-clip:text;color:transparent}.btn{border:0;border-radius:12px;padding:11px 16px;color:white;background:linear-gradient(90deg,var(--brand),var(--brand2));font-weight:700;cursor:pointer;box-shadow:0 8px 24px #0005}.btn.secondary{background:#1f2937}.btn.danger{background:var(--danger)}.btn.small{padding:8px 11px;font-size:12px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}.card{background:#111827d9;border:1px solid #334155;border-radius:22px;padding:18px;box-shadow:0 16px 40px #0004}.hero{padding:38px;border-radius:28px;background:radial-gradient(circle at top left,#7c3aed55,transparent 30%),radial-gradient(circle at right,#06b6d455,transparent 35%),#111827;border:1px solid #334155;margin-bottom:24px}.hero h1{font-size:44px;line-height:1.05;margin:0 0 12px}.hero p{color:var(--muted);font-size:18px;max-width:680px}.input,textarea,select{width:100%;padding:12px;border-radius:12px;border:1px solid #334155;background:#020617;color:var(--text);outline:none}label{display:block;margin:12px 0 6px;color:#cbd5e1;font-size:13px}.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.hidden{display:none!important}.pill{padding:5px 9px;border-radius:999px;background:#1e293b;color:#cbd5e1;font-size:12px}.course-img{width:100%;height:150px;object-fit:cover;border-radius:16px;background:#0b1220}.muted{color:var(--muted)}.layout{display:grid;grid-template-columns:330px 1fr;gap:18px}.sidebar{position:sticky;top:16px;align-self:start}.module{border:1px solid #334155;border-radius:16px;margin-top:10px;overflow:hidden}.module-title{padding:12px;background:#1e293b;font-weight:800}.lesson{display:flex;justify-content:space-between;gap:8px;padding:10px 12px;border-top:1px solid #334155;cursor:pointer}.lesson:hover{background:#0f172a}.lesson.active{background:#312e81}.video{width:100%;aspect-ratio:16/9;border:0;border-radius:18px;background:#000}.topbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}.tab{padding:10px 13px;border-radius:12px;background:#1f2937;cursor:pointer}.tab.active{background:linear-gradient(90deg,var(--brand),var(--brand2));font-weight:800}.table{width:100%;border-collapse:collapse}.table td,.table th{padding:11px;border-bottom:1px solid #334155;text-align:left}.modal{position:fixed;inset:0;background:#0009;display:flex;align-items:center;justify-content:center;padding:20px;z-index:5}.modal .card{width:min(760px,100%);max-height:90vh;overflow:auto}.toast{position:fixed;right:18px;bottom:18px;background:#111827;border:1px solid #334155;border-radius:14px;padding:12px 16px}.progress{height:10px;background:#1f2937;border-radius:100px;overflow:hidden}.progress div{height:100%;background:linear-gradient(90deg,var(--ok),var(--brand2))}@media(max-width:850px){.layout{grid-template-columns:1fr}.hero h1{font-size:32px}.nav{align-items:flex-start;flex-direction:column}}