:root{--bg:#070b10;--panel:#0e161d;--panel2:#121c26;--line:#1d2a36;--line2:#2a3b4a;--txt:#e7eef5;--mist:#9fb0c0;--dim:#5f7384;--cy:#43b0dd;--cy2:#8fe0f7;--ok:#4fd18b;--bad:#ff8a80;--r:14px;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--txt);font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--cy2);text-decoration:none}a:hover{text-decoration:underline}.defs{position:absolute}
h1,h2,h3{line-height:1.2;margin:0 0 .5em;letter-spacing:-.01em}h1{font-size:clamp(1.8rem,4vw,2.6rem)}h2{font-size:1.5rem}h3{font-size:1.15rem}
.top{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px clamp(16px,4vw,40px);border-bottom:1px solid var(--line);background:rgba(7,11,16,.9);backdrop-filter:blur(10px);position:sticky;top:0;z-index:5}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--txt);font-weight:700;letter-spacing:.08em;font-size:.9rem}.brand b{color:var(--cy2);font-weight:600}.brand-fox{width:34px;height:34px;filter:drop-shadow(0 0 7px rgba(67,176,221,.5))}.brand:hover{text-decoration:none}
.nav{display:flex;gap:6px;flex-wrap:wrap}.nav a{padding:8px 12px;border-radius:9px;color:var(--mist);font-weight:600;font-size:.92rem}.nav a:hover,.nav a.on{background:rgba(67,176,221,.1);color:var(--txt);text-decoration:none}
.app{flex:1;width:100%;max-width:1100px;margin:0 auto;padding:clamp(20px,4vw,40px) clamp(16px,4vw,40px)}
.foot{padding:20px;text-align:center;color:var(--dim);font-size:.82rem;border-top:1px solid var(--line)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:11px 18px;border-radius:10px;border:1px solid var(--line2);background:var(--panel2);color:var(--txt);font-weight:700;font-size:.95rem;cursor:pointer;transition:.15s}.btn:hover{border-color:var(--cy);text-decoration:none}
.btn.primary{background:linear-gradient(180deg,var(--cy),#2b86b4);color:#07111a;border-color:transparent;box-shadow:0 8px 28px rgba(67,176,221,.28)}.btn.primary:hover{filter:brightness(1.08)}.btn.danger{border-color:#5a2a2a;color:var(--bad)}.btn.sm{padding:7px 12px;font-size:.85rem}.btn[disabled]{opacity:.5;cursor:not-allowed}
.card{background:linear-gradient(165deg,var(--panel2),var(--panel));border:1px solid var(--line);border-radius:var(--r);padding:22px}.grid{display:grid;gap:16px}.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}@media(max-width:860px){.g2,.g3{grid-template-columns:1fr}}
.eyebrow{font:600 .72rem var(--mono);letter-spacing:.2em;text-transform:uppercase;color:var(--cy2);display:inline-flex;align-items:center;gap:8px;margin-bottom:10px}.eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--cy2);box-shadow:0 0 8px var(--cy2)}
.muted{color:var(--mist)}.small{font-size:.86rem}.mono{font-family:var(--mono)}.err{color:var(--bad);font-size:.9rem;margin-top:8px}.ok{color:var(--ok)}
form{display:flex;flex-direction:column;gap:12px}label{display:flex;flex-direction:column;gap:6px;font-weight:600;font-size:.9rem}input,select{background:#0a1118;border:1px solid var(--line2);border-radius:9px;color:var(--txt);padding:11px 12px;font:inherit}input:focus,select:focus{outline:2px solid rgba(67,176,221,.5);border-color:var(--cy)}
.hint{font-weight:400;color:var(--dim);font-size:.8rem}.auth{max-width:440px;margin:0 auto}.auth .card{padding:28px}
.hero{display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center;padding:20px 0 40px}@media(max-width:860px){.hero{grid-template-columns:1fr}}.hero p.lead{font-size:1.15rem;color:var(--mist)}
.fox-big{width:100%;max-width:360px;margin:0 auto;display:block;filter:drop-shadow(0 20px 50px rgba(67,176,221,.25))}
/* fur + eyes palettes */
.fur-silver{--f1:#c9d3dc;--f2:#95a4b2;--f3:#66788a;--f4:#2a3744}.fur-graphite{--f1:#8c98a4;--f2:#5f6b78;--f3:#3f4a56;--f4:#1d242c}.fur-arctic{--f1:#f1f5f8;--f2:#c6d2dc;--f3:#93a5b5;--f4:#3a4a5a}.fur-steel{--f1:#9fc3d6;--f2:#6b9bb5;--f3:#43708a;--f4:#1f3a4b}.fur-midnight{--f1:#4a5a74;--f2:#33415a;--f3:#222c40;--f4:#0f1522}.fur-violet{--f1:#b9a6e3;--f2:#8d78c4;--f3:#60509a;--f4:#2c2350}
.eyes-cyan{--e1:#43b0dd}.eyes-ice{--e1:#cfeeff}.eyes-emerald{--e1:#3fd68f}.eyes-gold{--e1:#f2c94c}.eyes-crimson{--e1:#ff5a6a}
.bg-none .bg-fill{fill:none}.bg-grid .bg-fill{fill:#0e161d}.bg-hex .bg-fill{fill:#101a24}.bg-matrix .bg-fill{fill:#071510}.bg-aurora .bg-fill{fill:#0b1430}
.acc{display:none}.acc-hoodie-on .acc-hoodie,.acc-headset-on .acc-headset,.acc-shades-on .acc-shades,.acc-beanie-on .acc-beanie,.acc-lanyard-on .acc-lanyard,.acc-goggles-on .acc-goggles{display:block}
/* dashboard */
.stat{display:flex;flex-direction:column;gap:2px}.stat b{font-size:1.6rem;line-height:1}.stat span{color:var(--mist);font-size:.82rem}
.xpbar{height:10px;background:#0a1118;border:1px solid var(--line2);border-radius:99px;overflow:hidden;margin:10px 0 6px}.xpbar i{display:block;height:100%;background:linear-gradient(90deg,var(--cy),var(--cy2));border-radius:99px;transition:width .6s}
.rank{display:inline-flex;align-items:center;gap:8px;padding:5px 10px;border-radius:8px;background:rgba(67,176,221,.1);border:1px solid rgba(67,176,221,.3);font:700 .78rem var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--cy2)}
.badges{display:flex;flex-wrap:wrap;gap:10px}.badge{display:flex;gap:10px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--panel)}.badge.locked{opacity:.4;filter:grayscale(1)}.badge i{font-style:normal;font-size:1.4rem}.badge b{display:block;font-size:.9rem}.badge span{color:var(--mist);font-size:.78rem}
/* courses */
.path{border-top:2px solid var(--cy);padding-top:14px}.path h3{display:flex;align-items:center;gap:10px}.path .pill{font:600 .68rem var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--dim);border:1px solid var(--line2);padding:2px 8px;border-radius:6px}
.course{display:flex;flex-direction:column;gap:8px;padding:16px;border:1px solid var(--line);border-radius:12px;background:var(--panel);transition:.15s}.course:hover{border-color:var(--cy)}.course .meta{display:flex;gap:10px;font:600 .72rem var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--dim)}.course.soon{opacity:.7}.course .prog{height:6px;background:#0a1118;border-radius:99px;overflow:hidden}.course .prog i{display:block;height:100%;background:var(--cy)}
.tag{font:700 .68rem var(--mono);letter-spacing:.12em;text-transform:uppercase;padding:3px 8px;border-radius:6px}.tag.live{background:rgba(79,209,139,.12);color:var(--ok);border:1px solid rgba(79,209,139,.35)}.tag.soon{background:rgba(159,176,192,.08);color:var(--mist);border:1px solid var(--line2)}
.lessons{display:flex;flex-direction:column;gap:8px}.lesson{display:flex;align-items:center;gap:12px;padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--panel);color:var(--txt)}.lesson:hover{border-color:var(--cy);text-decoration:none}.lesson .n{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;font:700 .8rem var(--mono);background:#0a1118;border:1px solid var(--line2)}.lesson.done .n{background:rgba(79,209,139,.15);border-color:var(--ok);color:var(--ok)}.lesson .t{flex:1}.lesson .m{color:var(--dim);font-size:.8rem}
/* lesson prose */
.prose{max-width:780px}.prose p.lead{font-size:1.12rem;color:var(--mist)}.prose h3{margin-top:26px;color:var(--cy2)}.prose ul,.prose ol{padding-left:22px}.prose li{margin:4px 0}.prose code{font-family:var(--mono);font-size:.88em;background:#0a1118;padding:1px 6px;border-radius:5px;border:1px solid var(--line)}
.vis{margin:22px 0;padding:14px;border:1px solid var(--line);border-radius:12px;background:#0a1118}.vis svg{width:100%;height:auto;display:block}.vis figcaption{margin-top:8px;color:var(--dim);font-size:.82rem;text-align:center}
.joke{margin:18px 0;padding:12px 14px;border-left:3px solid var(--cy);background:rgba(67,176,221,.06);border-radius:0 10px 10px 0;color:var(--mist)}.try{margin:18px 0;padding:14px;border:1px dashed var(--cy);border-radius:10px;background:rgba(67,176,221,.05)}.refs{color:var(--mist);font-size:.92rem}
table.map{width:100%;border-collapse:collapse;font-size:.92rem;margin:14px 0}table.map th,table.map td{border:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}table.map th{color:var(--cy2);background:#0a1118}
.lesson-nav{display:flex;gap:10px;justify-content:space-between;margin-top:30px;flex-wrap:wrap}
/* quiz */
.q{padding:16px;border:1px solid var(--line);border-radius:12px;background:var(--panel);margin-bottom:12px}.q .opts{display:grid;gap:8px;margin-top:10px}.q label{flex-direction:row;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--line2);border-radius:9px;cursor:pointer;font-weight:500}.q label:hover{border-color:var(--cy)}.q input{width:auto}.q.right{border-color:var(--ok)}.q.wrong{border-color:var(--bad)}.q .ex{margin-top:10px;color:var(--mist);font-size:.9rem}
.score{font-size:3rem;font-weight:800;line-height:1}
/* certificate */
.cert{border:2px solid var(--cy);border-radius:16px;padding:36px;background:radial-gradient(600px 300px at 50% 0,rgba(67,176,221,.15),transparent),var(--panel);text-align:center;position:relative}.cert .id{font:700 .9rem var(--mono);letter-spacing:.2em;color:var(--cy2)}.cert h2{font-size:2rem;margin:16px 0 6px}.cert .name{font-size:1.6rem;font-weight:800}.cert .sig{margin-top:22px;color:var(--mist);font-size:.88rem}
/* avatar customiser */
.cust{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:start}@media(max-width:860px){.cust{grid-template-columns:1fr}}.opts{display:flex;flex-wrap:wrap;gap:8px}.opt{padding:8px 12px;border:1px solid var(--line2);border-radius:9px;background:var(--panel);cursor:pointer;font-weight:600;font-size:.88rem;color:var(--mist)}.opt.on{border-color:var(--cy);color:var(--txt);background:rgba(67,176,221,.1)}
.swatch{width:34px;height:34px;border-radius:50%;border:2px solid var(--line2);cursor:pointer}.swatch.on{border-color:var(--cy2);box-shadow:0 0 0 3px rgba(67,176,221,.3)}
/* toasts */
.toasts{position:fixed;right:16px;bottom:16px;display:flex;flex-direction:column;gap:8px;z-index:9}.toast{padding:12px 16px;border-radius:12px;background:#0e161d;border:1px solid var(--cy);color:var(--txt);box-shadow:0 10px 30px rgba(0,0,0,.5);animation:pop .3s ease-out;max-width:320px}.toast.gold{border-color:#f2c94c}.toast b{color:var(--cy2)}@keyframes pop{from{transform:translateY(12px);opacity:0}}
.codes{display:grid;grid-template-columns:repeat(2,1fr);gap:6px;font-family:var(--mono);background:#0a1118;padding:12px;border-radius:10px;border:1px solid var(--line2)}
.kv{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}