:root{--bg:#040c0e;--surface:#091820;--surface-2:#0e2030;--teal:#0d9488;--teal-bright:#14b8a6;--teal-glow:rgba(20,184,166,0.45);--amber:#d97706;--amber-bright:#f59e0b;--text:#f1f5f9;--text-muted:#94a3b8;--border:rgba(20,184,166,0.14);--border-med:rgba(20,184,166,0.3);--radius:12px}*{box-sizing:border-box;margin:0;padding:0}body,html{background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,sans-serif;min-height:100%;-webkit-font-smoothing:antialiased}h1,h2,h3{font-family:Montserrat,sans-serif;line-height:1.12;letter-spacing:-.02em}a{color:var(--teal-bright);text-decoration:none}a:hover{text-decoration:underline}.shell{min-height:100vh;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 24px;border-bottom:1px solid var(--border);background:linear-gradient(180deg,var(--surface),transparent)}.brand{font-family:Montserrat,sans-serif;font-weight:800;font-size:14px;letter-spacing:.08em;text-transform:uppercase;color:#fff}.brand .accent{color:var(--teal-bright)}.topbar-right{display:flex;align-items:center;gap:16px;font-size:13px;color:var(--text-muted)}.container{width:100%;max-width:1040px;margin:0 auto;padding:32px 24px 64px;flex:1 1}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:Montserrat,sans-serif;font-weight:700;font-size:14px;padding:11px 18px;border-radius:var(--radius);border:1px solid var(--border-med);background:var(--surface-2);color:var(--text);cursor:pointer;transition:all .15s ease}.btn:hover{border-color:var(--teal-bright);text-decoration:none}.btn-primary{background:linear-gradient(135deg,var(--teal),var(--teal-bright));border-color:transparent;color:#02110f}.btn-primary:hover{box-shadow:0 0 24px var(--teal-glow)}.btn-amber{background:linear-gradient(135deg,var(--amber),var(--amber-bright));border-color:transparent;color:#1a0d00}.btn-danger{background:transparent;border-color:rgba(248,113,113,.4);color:#fca5a5}.btn-sm{padding:7px 12px;font-size:12px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));grid-gap:18px;gap:18px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.card h3{font-size:18px;margin-bottom:6px}.muted{color:var(--text-muted);font-size:14px}.pill{display:inline-block;font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;padding:3px 9px;border-radius:999px;border:1px solid var(--border-med);color:var(--teal-bright)}.pill.off{color:var(--text-muted);border-color:var(--border)}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}.field label{font-size:13px;font-weight:600;color:var(--text-muted)}.input,.textarea,select{width:100%;background:var(--bg);border:1px solid var(--border-med);border-radius:10px;padding:11px 13px;color:var(--text);font-family:inherit;font-size:15px}.input:focus,.textarea:focus,select:focus{outline:none;border-color:var(--teal-bright)}.textarea{min-height:90px;resize:vertical}.auth-wrap{min-height:100vh;display:grid;place-items:center;padding:24px;background:radial-gradient(900px 500px at 50% -10%,rgba(20,184,166,.12),transparent),var(--bg)}.auth-card{width:100%;max-width:400px;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:36px 32px}.auth-card h1{font-size:22px;margin-bottom:4px}.error{background:rgba(248,113,113,.1);border:1px solid rgba(248,113,113,.35);color:#fca5a5;padding:10px 12px;border-radius:10px;font-size:13px;margin-bottom:16px}.notice{background:rgba(245,158,11,.08);border:1px solid rgba(245,158,11,.3);color:var(--amber-bright);padding:12px 14px;border-radius:10px;font-size:13px;margin-bottom:20px}.video-frame{position:relative;width:100%;aspect-ratio:16/9;border-radius:var(--radius);overflow:hidden;border:1px solid var(--border-med);background:#000}.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}table{width:100%;border-collapse:collapse;font-size:14px}td,th{text-align:left;padding:11px 12px;border-bottom:1px solid var(--border)}th{color:var(--text-muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.04em}.section-head{margin-bottom:18px;gap:16px;flex-wrap:wrap}.lesson-row,.section-head{display:flex;align-items:center;justify-content:space-between}.lesson-row{padding:12px 0;border-bottom:1px solid var(--border);gap:12px}.stack{flex-direction:column;gap:18px}.row,.stack{display:flex}.row{gap:10px;align-items:center;flex-wrap:wrap}