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.badges{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px}.lvideo{margin-top:22px}.lvideo__frame{position:relative;aspect-ratio:16/9;width:100%;border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line);background:var(--surface-1)}.lvideo__frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.lbar{display:flex;flex-wrap:wrap;gap:10px 18px;margin-top:18px;padding:14px 16px;border-radius:6px;background:var(--surface-1);border:1px solid var(--line-soft)}.lbar,.lbar .fct{align-items:center}.lbar .fct{display:inline-flex;gap:7px;font-size:13px;color:var(--text-mut)}.lbar .fct .icon{width:15px;height:15px;color:var(--text-dim)}.lbar .fct b{color:var(--text);font-family:var(--font-mono);font-weight:600}.lsec{margin-top:34px}.lsec>.lbl{display:flex;align-items:center;gap:9px;font-family:var(--font-mono);font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim);margin:0 0 12px}.lsec>.lbl:after{content:"";flex:1;height:1px;background:var(--line-soft)}.lsec p{margin:0;font-size:16px;line-height:1.62;color:var(--text-mut)}.lsec p+p{margin-top:14px}.lsec p.lead{color:var(--text);font-size:17px}.dod{padding:16px 18px;border-radius:6px;background:var(--surface-1);border:1px solid var(--line-soft);display:flex;gap:12px;align-items:flex-start}.dod .icon{width:20px;height:20px;color:var(--done);flex:none;margin-top:1px}.dod__body{min-width:0}.dod p{font-size:15px;color:var(--text)}.chips{display:flex;flex-wrap:wrap;gap:8px}.chip{font-family:var(--font-mono);font-size:12.5px;color:var(--text-mut);padding:5px 11px;border-radius:var(--r-chip);background:var(--surface-2);border:1px solid var(--line-soft)}.chip:before{content:"›";color:var(--accent);margin-right:6px}.deplist{display:flex;flex-direction:column;gap:8px}.deplist .none{font-size:14px;color:var(--text-dim);font-style:italic}.deprow{display:grid;grid-template-columns:auto 1fr auto;gap:12px;align-items:center;padding:11px 14px;border-radius:6px;background:var(--surface-1);border:1px solid var(--line-soft)}.deprow:hover{border-color:var(--accent-line)}.deprow .dn{font-family:var(--font-mono);font-size:12px;color:var(--text-dim)}.deprow .dnm{font-size:14px;font-weight:540;min-width:0}.deprow .go{color:var(--text-dim)}.deprow:hover .go{color:var(--accent)}.deprow .go .icon{width:15px;height:15px}.pager{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:44px}.pg{display:flex;flex-direction:column;gap:4px;padding:16px 18px;border-radius:6px;background:var(--surface-1);border:1px solid var(--line-soft);transition:border-color .15s ease,background .15s ease}.pg:hover{border-color:var(--accent-line);background:var(--surface-2)}.pg.next{text-align:right;align-items:flex-end}.pg .k{font-family:var(--font-mono);font-size:11px;color:var(--text-dim);display:inline-flex;align-items:center;gap:6px}.pg .k .icon{width:13px;height:13px}.pg .v{font-size:14.5px;font-weight:600;letter-spacing:-.01em}.pg.disabled{opacity:.4;pointer-events:none}@media (max-width:900px){.lesson{grid-template-columns:1fr}.side{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line-soft)}.navwrap>summary{display:flex;align-items:center;gap:10px;list-style:none;cursor:pointer;padding:14px clamp(18px,4vw,32px);font-size:13.5px;font-weight:600}.navwrap>summary::-webkit-details-marker{display:none}.navwrap>summary .chev{margin-left:auto;font-family:var(--font-mono);color:var(--text-dim);font-size:12px}.navwrap[open]>summary .chev{transform:rotate(90deg)}.navlist{max-height:50vh}}@media (max-width:560px){.pager{grid-template-columns:1fr}}.auth-shell{padding:clamp(48px,9vh,96px) clamp(16px,4vw,32px)}.auth-card{max-width:420px;margin:0 auto;padding:28px clamp(20px,4vw,32px) 32px;background:var(--surface-1);border:1px solid var(--line-soft);border-radius:var(--r-card);box-shadow:var(--shadow-2)}.auth-head{margin-bottom:24px}.auth-form{gap:16px}.auth-field,.auth-form{display:flex;flex-direction:column}.auth-field{gap:7px}.auth-label{font-family:var(--font-mono);font-size:11.5px;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-dim)}.auth-input{font:inherit;font-size:14.5px;color:var(--text);background:var(--surface-2);border:1px solid var(--line);border-radius:var(--r-btn);padding:11px 13px;transition:border-color .16s ease,background .16s ease}.auth-input:focus-visible{outline:none;border-color:var(--accent-line);background:var(--surface-1)}.auth-input::-moz-placeholder{color:var(--text-dim)}.auth-input::placeholder{color:var(--text-dim)}.auth-error{margin:0;font-size:13px;color:var(--gate);background:var(--gate-soft);border:1px solid color-mix(in oklab,var(--gate) 30%,transparent);border-radius:var(--r-chip);padding:9px 12px}.auth-submit{width:100%;margin-top:4px}.auth-submit:disabled{opacity:.6;cursor:default}.auth-links{margin:6px 0 0;font-size:13px;text-align:center}.auth-links a{color:var(--text-mut);text-decoration:none;border-bottom:1px solid transparent;transition:color .15s ease,border-color .15s ease}.auth-links a:hover{color:var(--accent);border-bottom-color:var(--accent-line)}.auth-account-head{display:flex;flex-wrap:wrap;gap:16px;align-items:flex-end;justify-content:space-between;margin-bottom:28px;max-width:var(--maxw)}.auth-course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}.auth-course-card{text-decoration:none;color:inherit}.auth-course-cta{display:inline-flex;align-items:center;gap:6px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line-soft);font-family:var(--font-mono);font-size:12px;color:var(--accent)}.auth-course-cta .icon{width:14px;height:14px}