.tut-launch{position:fixed;right:18px;bottom:18px;z-index:60;display:inline-flex;align-items:center;gap:7px;padding:11px 16px;border:none;border-radius:24px;cursor:pointer;font-weight:800;font-size:14px;color:#fff;background:linear-gradient(120deg,#4338ca,#7c3aed);box-shadow:0 8px 22px #4338ca59}.tut-launch:hover{filter:brightness(1.06)}.tut-spark{font-size:15px}.tut-backdrop{display:none;position:fixed;inset:0;background:#102a4359;z-index:61}.tut-backdrop.open{display:block}.tut-drawer{display:none;position:fixed;top:0;right:0;height:100dvh;width:min(384px,100vw);z-index:62;flex-direction:column;background:var(--bg);border-left:1px solid var(--line);box-shadow:-14px 0 40px #102a432e}.tut-drawer.open{display:flex}.tut-head{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;padding:14px 16px;border-bottom:1px solid var(--line);background:linear-gradient(120deg,#1e3a8a,#4338ca);color:#fff}.tut-head strong{font-size:16px}.tut-ctx{font-size:12px;color:#ffffffd1;margin-top:2px;max-width:270px}.tut-x{background:#fff3;border:none;color:#fff;width:32px;height:32px;border-radius:9px;cursor:pointer;font-size:15px;flex:0 0 auto;line-height:1}.tut-x:hover{background:#ffffff52}.tut-msgs{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px}.tut-bub{max-width:90%;padding:11px 14px;border-radius:14px;font-size:14.5px;line-height:1.5;white-space:pre-wrap;word-wrap:break-word}.tut-bub.user{align-self:flex-end;background:var(--accent);color:#fff;border-bottom-right-radius:5px}.tut-bub.bot{align-self:flex-start;background:var(--panel);border:1px solid var(--line);color:var(--text);border-bottom-left-radius:5px}.tut-bub.sys{align-self:center;background:var(--amber-bg);color:#8a5a08;font-size:13px;text-align:center;max-width:100%}.tut-bub.sys a{color:#8a5a08;font-weight:700;text-decoration:underline}.tut-sugtitle{font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);padding:0 16px 6px}.tut-actions{display:flex;gap:8px;flex-wrap:wrap;padding:0 16px 10px}.tut-chip{border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:20px;padding:8px 13px;font-size:12.5px;font-weight:600;cursor:pointer;text-align:left;line-height:1.3}.tut-chip:hover{border-color:var(--accent);color:var(--accent)}.tut-input{display:flex;gap:8px;padding:12px 16px;border-top:1px solid var(--line);background:var(--bg)}.tut-input input{flex:1;padding:11px 13px;border-radius:11px;border:1px solid var(--line);background:var(--field);color:var(--text);font-size:15px}.tut-typing{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--muted);animation:tutblink 1s infinite}@keyframes tutblink{0%,to{opacity:.3}50%{opacity:1}}@media (max-width:520px){.tut-launch span:not(.tut-spark){display:none}.tut-launch{padding:13px}.tut-drawer{width:100vw}}:root{--ink:#102A43;--bg:#F8FAFC;--panel:#FFFFFF;--line:#E2E8F0;--text:#334155;--muted:#64748B;--accent:#2563EB;--accent2:#1D4ED8;--brand:#60A5FA;--green:#0F766E;--amber:#F59E0B;--red:#DC2626;--chip:#EFF4FB;--field:#F8FAFC;--blue-bg:#DBEAFE;--blue-fg:#2563EB;--teal-bg:#CCFBF1;--teal-fg:#0F766E;--green-bg:#DCFCE7;--green-fg:#16A34A;--purple-bg:#EDE9FE;--purple-fg:#7C3AED;--amber-bg:#FEF3C7;--amber-fg:#D97706;--orange-bg:#FFEDD5;--orange-fg:#EA580C;--red-bg:#FEE2E2;--red-fg:#DC2626;--navy-soft:#7C90AE;--radius:14px;--maxw:1140px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;font-size:16px}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}header.site{position:sticky;top:0;z-index:20;background:var(--ink);border-bottom:1px solid rgba(255,255,255,.08)}header.site .wrap{display:flex;align-items:center;gap:18px;height:64px}.brand{display:flex;flex-direction:column;line-height:1.05;gap:1px}.brand .bname{font-weight:800;letter-spacing:.3px;font-size:18px;color:#fff}.brand .bname span{color:var(--brand)}.brand .btag{font-size:9px;letter-spacing:.6px;text-transform:uppercase;color:var(--navy-soft)}.brand:hover{text-decoration:none}nav.top{margin-left:auto;display:flex;gap:20px;font-size:14px}nav.top a{color:#cbd5e1}nav.top a.active,nav.top a:hover{color:#fff;text-decoration:none}.auth{display:flex;align-items:center;gap:12px}.auth .login{color:#cbd5e1;font-size:14px}.auth .login:hover{color:#fff;text-decoration:none}.btn.sm{padding:7px 15px;font-size:13px;border-radius:8px}.icon{display:inline-flex;align-items:center;justify-content:center;border-radius:9px;flex:0 0 auto}.icon svg{width:55%;height:55%}footer.site{background:var(--ink);margin-top:60px;padding:28px 0;color:#cbd5e1;font-size:13px}footer.site strong{color:#fff}footer.site a{color:var(--brand)}h1,h2,h3{line-height:1.25;color:var(--ink)}h1{font-size:34px;margin:0 0 10px}.btn{display:inline-block;padding:11px 18px;border-radius:10px;font-weight:700;font-size:15px;border:1px solid var(--line);background:var(--panel);color:var(--ink);cursor:pointer}.btn:hover{border-color:var(--accent);text-decoration:none}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover{background:var(--accent2)}.chip{display:inline-block;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.4px;padding:4px 10px;border-radius:20px;background:var(--chip);color:var(--accent2);border:1px solid var(--line)}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:0 1px 2px #102a430a,0 1px 3px #102a430f}.grid{display:grid;gap:16px}.muted{color:var(--muted)}.disclaimer{font-size:12px;color:var(--muted);border-top:1px solid var(--line);margin-top:30px;padding-top:16px}.bar{height:8px;border-radius:6px;background:var(--line);overflow:hidden}.bar>span{display:block;height:100%;background:var(--accent)}code{background:var(--chip);color:var(--accent2);padding:2px 6px;border-radius:6px;font-size:.92em}.opt{display:flex;gap:10px;align-items:flex-start;width:100%;text-align:left;margin:7px 0;padding:11px 14px;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--text);cursor:pointer;font-size:15px;line-height:1.5;transition:border-color .12s,background .12s}.opt:hover:not(.locked){border-color:var(--accent);background:#f5f8ff}.opt.locked{cursor:default}.opt .mk{flex:0 0 18px;font-weight:800;color:var(--muted);text-align:center}.opt.chosen{border-color:var(--accent);background:#f5f8ff}.opt.correct{border-color:var(--green);background:#0f766e17}.opt.correct .mk{color:var(--green)}.opt.wrong{border-color:var(--red);background:#dc262612}.opt.wrong .mk{color:var(--red)}.fb{display:flex;align-items:center;gap:10px;margin-top:14px;padding:11px 14px;border-radius:10px;font-weight:700;font-size:15px}.fb .ic{font-size:18px;line-height:1}.fb.ok{background:#0f766e1a;color:var(--green);border:1px solid var(--green)}.fb.no{background:#dc262614;color:var(--red);border:1px solid var(--red)}.expl{margin-top:12px;padding:14px 16px;background:var(--field);border-left:3px solid var(--accent);border-radius:8px;color:var(--text);line-height:1.6}.expl .lab{display:block;font-size:11px;font-weight:800;letter-spacing:.5px;text-transform:uppercase;color:var(--accent2);margin-bottom:6px}.ansline{font-size:13px;color:var(--muted);margin-top:10px}.ansline b.ok{color:var(--green)}.ansline b.no{color:var(--red)}.expl .ref{margin-top:10px;padding-top:8px;border-top:1px dashed var(--line);font-size:12px;color:var(--muted)}.expl .ref b{color:var(--text);font-weight:600}.rowhead{display:flex;justify-content:space-between;align-items:baseline;gap:12px;flex-wrap:wrap}.seeall{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:700;white-space:nowrap}.seeall svg{width:15px;height:15px}.catalog{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px;margin-top:16px}.cat{display:block;text-decoration:none}.cat:hover{border-color:var(--accent);text-decoration:none}.cat-top{display:flex;align-items:center;gap:10px;margin-bottom:10px}.cat-name{font-weight:700;font-size:16px;color:var(--ink);min-height:44px}.cat-meta{font-size:13px;margin-top:8px}.chip.lv-teal{color:var(--teal-fg)}.chip.lv-purple{color:var(--purple-fg)}.chip.lv-green{color:var(--green-fg)}.chip.lv-amber{color:var(--amber-fg)}.chip.lv-orange{color:var(--orange-fg)}.chip.lv-blue{color:var(--accent)}.app{display:grid;grid-template-columns:200px 1fr;gap:22px;align-items:start}.app .side{background:var(--ink);border-radius:var(--radius);padding:14px 10px;display:flex;flex-direction:column;gap:3px;position:sticky;top:80px}.app .navitem{display:flex;align-items:center;gap:10px;color:#a9b8ce;font-size:13.5px;padding:9px 11px;border-radius:9px}.app .navitem:hover{color:#fff;background:#1b3a5c;text-decoration:none}.app .navitem.on{color:#fff;background:#1b3a5c;font-weight:600}.app .navitem .ni{width:17px;height:17px;display:inline-flex;flex:0 0 auto}.app .navitem .ni svg{width:100%;height:100%}.app .navitem.foot{margin-top:8px}.app .appmain{min-width:0}@media (max-width:820px){.app{grid-template-columns:1fr}.app .side{flex-direction:row;flex-wrap:wrap;position:static}}.flag{background:none;border:1px solid var(--line);border-radius:8px;padding:3px 10px;cursor:pointer;color:var(--muted);font-size:13px;line-height:1.2}.flag:hover{border-color:var(--amber-fg);color:var(--amber-fg)}.flag.on{color:var(--amber-fg);border-color:var(--amber-fg);background:var(--amber-bg)}