:root{
  --bg:#0a0f1f; --bg2:#0e1530; --panel:#121a37; --panel2:#18224a; --line:#263366;
  --text:#e8ecff; --mute:#98a3cc; --acc:#4cc9f0; --ok:#7ae582; --bad:#ff4d6d;
  --warn:#ffd166; --enc:#b388ff; --org:#f9a03f; --r:14px;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; min-height:100vh; color:var(--text);
  font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  background:radial-gradient(1100px 560px at 75% -10%,#1b2d6a66,transparent 70%),
             radial-gradient(800px 500px at -10% 110%,#3a1b6a44,transparent 70%),var(--bg);
  background-attachment:fixed;
}
a{color:var(--acc);text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer}
code{font-family:var(--mono);background:#0b1230;border:1px solid var(--line);padding:1px 6px;border-radius:6px;font-size:.88em;color:#bfe9ff}
b{color:#fff}
.k{color:var(--acc);font-weight:600}

/* ---------- header ---------- */
.top{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:18px;padding:10px 22px;
  background:#0a0f1fd9;backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.logo{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:800;letter-spacing:.08em}
.logo b{color:var(--acc)}
.logo-box{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#1d3b8a,#5b2ea6);box-shadow:0 0 18px #4cc9f055}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a{color:var(--mute);padding:6px 12px;border-radius:999px;font-size:.92rem;white-space:nowrap}
.nav a:hover{color:var(--text);background:var(--panel)}
.nav a.on{color:var(--text);background:var(--panel2);box-shadow:inset 0 0 0 1px var(--line)}
.rank{margin-left:auto;display:flex;align-items:center;gap:10px;font-size:.85rem;color:var(--mute);min-width:210px}
.rank .rk-name{color:var(--text);font-weight:700;white-space:nowrap}
.xpbar{flex:1;height:8px;border-radius:99px;background:var(--panel2);overflow:hidden;min-width:70px}
.xpbar div{height:100%;background:linear-gradient(90deg,var(--acc),var(--enc));border-radius:99px;transition:width .6s}

main{max-width:1120px;margin:0 auto;padding:24px 20px 80px}

/* ---------- generic ---------- */
.btn{border:1px solid var(--line);background:var(--panel2);padding:9px 18px;border-radius:10px;font-weight:600;transition:.15s}
.btn:hover{border-color:var(--acc);transform:translateY(-1px)}
.btn.primary{background:linear-gradient(135deg,#1f8fd1,#6a3fd6);border-color:transparent;color:#fff;box-shadow:0 6px 20px #4cc9f033}
.btn.primary:hover{box-shadow:0 8px 26px #4cc9f066}
.btn.ghost{background:transparent}
.btn:disabled{opacity:.4;cursor:default;transform:none}
.card{background:linear-gradient(180deg,var(--panel),var(--bg2));border:1px solid var(--line);border-radius:var(--r);padding:20px}
.muted{color:var(--mute)}
h1,h2,h3{line-height:1.25;margin:0 0 8px}
.pill{display:inline-block;font-size:.72rem;padding:2px 9px;border-radius:99px;border:1px solid var(--line);color:var(--mute);background:var(--bg2);font-weight:600}
.pill.video{color:#ffd166;border-color:#ffd16655}
.pill.bonus{color:#7ae582;border-color:#7ae58255}

/* ---------- map ---------- */
.hero{display:grid;grid-template-columns:1.4fr 1fr;gap:20px;margin-bottom:26px}
.hero h1{font-size:2rem}
.hero h1 span{background:linear-gradient(90deg,var(--acc),var(--enc));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .legend{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.progress-ring{display:flex;flex-direction:column;justify-content:center;gap:12px}
.bigbar{height:12px;border-radius:99px;background:var(--panel2);overflow:hidden}
.bigbar div{height:100%;background:linear-gradient(90deg,var(--ok),var(--acc));transition:width .6s}
.zone-card{margin-bottom:22px;border-left:4px solid var(--zc)}
.zone-card h2{display:flex;align-items:center;gap:10px;font-size:1.25rem}
.zone-card h2 small{color:var(--zc);font-size:.75rem;letter-spacing:.12em;text-transform:uppercase}
.tiles{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:10px;margin-top:14px}
.tile{position:relative;display:flex;flex-direction:column;gap:4px;padding:12px 14px;border-radius:12px;background:var(--bg2);border:1px solid var(--line);color:var(--text);transition:.15s;min-height:96px}
.tile:hover{border-color:var(--zc);transform:translateY(-2px);box-shadow:0 8px 24px #0006}
.tile .ti{font-size:1.5rem;line-height:1}
.tile .tn{font-weight:700;font-size:.95rem}
.tile .tm{display:flex;justify-content:space-between;align-items:center;margin-top:auto;font-size:.8rem}
.tile.done{background:linear-gradient(180deg,#14284a,var(--bg2))}
.tile.done::after{content:"✓";position:absolute;top:8px;right:10px;color:var(--ok);font-weight:800}
.tile.next{box-shadow:0 0 0 2px var(--zc),0 0 22px color-mix(in srgb,var(--zc) 45%,transparent)}
.stars{color:var(--warn);letter-spacing:1px}
.stars .off{color:#3a4677}

/* ---------- level ---------- */
.lvhead{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:16px}
.lvhead h1{font-size:1.6rem;margin:0}
.lvhead .crumb{font-size:.8rem;color:var(--mute)}
.tabs{margin-left:auto;display:flex;gap:6px;background:var(--panel);padding:4px;border-radius:12px;border:1px solid var(--line)}
.tabs button{border:0;background:transparent;padding:7px 16px;border-radius:9px;color:var(--mute);font-weight:600}
.tabs button.on{background:var(--panel2);color:var(--text);box-shadow:inset 0 0 0 1px var(--line)}
.stage{position:relative;border-radius:var(--r);border:1px solid var(--line);overflow:hidden;
  background:radial-gradient(600px 300px at 50% 40%,#16245099,transparent 70%),
             linear-gradient(#ffffff06 1px,transparent 1px) 0 0/28px 28px,
             linear-gradient(90deg,#ffffff06 1px,transparent 1px) 0 0/28px 28px,#0b1128}
.stage-svg{display:block;width:100%;height:auto}
.stage-ctl{display:flex;justify-content:flex-end;gap:6px;padding:6px 10px;border-top:1px solid var(--line);background:#0a0f1f99}
.stage-ctl button{background:#0a0f1fcc;border:1px solid var(--line);border-radius:8px;padding:4px 10px;font-size:.8rem;color:var(--mute)}
.stage-ctl button:hover,.stage-ctl button.on{color:var(--text);border-color:var(--acc)}
.ltext{margin-top:16px;min-height:150px}
.lstep{font-size:.78rem;color:var(--mute);letter-spacing:.1em;text-transform:uppercase;margin-bottom:6px}
.lbody{font-size:1.06rem}
.lbody p{margin:0 0 10px}
.lnav{display:flex;align-items:center;gap:12px;margin-top:16px}
.dots{display:flex;gap:6px;flex:1;justify-content:center;flex-wrap:wrap}
.dots button{width:10px;height:10px;border-radius:99px;border:0;background:#2b3770;padding:0}
.dots button.on{background:var(--acc);width:26px}
.dots button.seen{background:#4a5aa0}
.seclens{border:1px solid #ff4d6d55;background:linear-gradient(180deg,#2a1230,#140f2a);border-radius:var(--r);padding:16px 18px;margin-bottom:14px}
.seclens h3{color:#ff8fa3;font-size:1rem;letter-spacing:.05em}
.terms{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 16px}
.term{background:var(--bg2);border:1px solid var(--line);border-radius:10px;padding:6px 10px;font-size:.88rem}
.term b{color:var(--acc)}

/* ---------- svg scene styles ---------- */
.nbg{fill:#0e1636;stroke:currentColor;stroke-width:2}
.node use{fill:none;stroke:currentColor;stroke-width:2.6;stroke-linecap:round;stroke-linejoin:round}
.node .halo{fill:currentColor;opacity:.16;animation:halo 1.6s ease-in-out infinite}
.node.bad .nbg{fill:#2a0d1c}
.node.dim{opacity:.35}
@keyframes halo{50%{opacity:.04;transform:scale(1.15)}}
.nlabel{fill:#e8ecff;font-size:13px;font-weight:700;text-anchor:middle}
.nsub{fill:#98a3cc;font-size:11px;text-anchor:middle;font-family:var(--mono)}
.lk line{stroke:#3c4c8a;stroke-width:3}
.lk-wifi line{stroke:#b388ff;stroke-dasharray:3 7;stroke-linecap:round;stroke-width:3}
.lk-tun line{stroke:#b388ff;stroke-width:12;stroke-opacity:.35}
.lk-net line{stroke:#6c7bb8;stroke-dasharray:10 8}
.lk-bad line{stroke:#ff4d6d;stroke-dasharray:6 6}
.lk-ok line{stroke:#7ae582}
.lk-hot line{stroke:#f9a03f;stroke-width:4}
.lk-trunk line{stroke:#ffd166;stroke-width:6}
.lk-ghost line{stroke:#3c4c8a;stroke-opacity:.35;stroke-dasharray:4 6}
.lklabel{fill:#98a3cc;font-size:11px;text-anchor:middle;font-family:var(--mono)}
.cutx{fill:#ff4d6d;font-size:22px;font-weight:900;text-anchor:middle}
.zlabel{font-size:12px;font-weight:700;letter-spacing:.06em}
.tbg{fill:#0b1230ee;stroke:#33427a}
.ttitle{fill:#ffd166;font-size:12px;font-weight:700}
.trow{fill:#cfd8ff;font-size:12px;font-family:var(--mono)}
.trow.th{fill:#7d89b8}
.trow.hl{fill:#7ae582;font-weight:700}
.trow.bad{fill:#ff4d6d;font-weight:700}
.note{fill:#cfd8ff;font-size:13px}
.ptext{font-size:11px;font-weight:800;fill:#0a0f1f;text-anchor:middle;font-family:var(--mono)}
.pkt rect{stroke:#0a0f1f;stroke-width:1.5}
.dropx{fill:#ff4d6d;font-size:24px;font-weight:900;text-anchor:middle}
[data-at],[data-until]{transition:opacity .35s}

/* ---------- challenges ---------- */
.chhead{display:flex;align-items:center;gap:12px;margin-bottom:16px;font-size:.85rem;color:var(--mute)}
.chprog{flex:1;height:8px;border-radius:99px;background:var(--panel2);overflow:hidden}
.chprog div{height:100%;background:linear-gradient(90deg,var(--acc),var(--enc));transition:width .4s}
.chscore{color:var(--ok);font-weight:700}
.qtitle{font-size:1.15rem;font-weight:700;margin-bottom:12px}
.qsub{color:var(--mute);margin:-6px 0 12px}
pre.code{background:#070c1f;border:1px solid var(--line);border-radius:10px;padding:12px 14px;overflow:auto;font:13px/1.55 var(--mono);color:#bfe9ff;margin:0 0 14px;white-space:pre}
.opts{display:grid;gap:10px}
.opt{text-align:left;padding:12px 16px;border-radius:12px;border:1px solid var(--line);background:var(--bg2);transition:.15s;font-size:1rem}
.opt:hover:not(:disabled){border-color:var(--acc);background:var(--panel2)}
.opt.ok{border-color:var(--ok);background:#12321f;color:#d6ffe0}
.opt.no{border-color:var(--bad);background:#3a1220;color:#ffd6de}
.opt:disabled{cursor:default}
.why{margin-top:14px;padding:0;font-size:.98rem}
.why.show{padding:14px 16px;border-radius:12px;background:var(--bg2);border:1px solid var(--line)}
.cont{margin-top:16px}
.match{display:grid;grid-template-columns:1fr 1.6fr;gap:12px}
.mcol{display:grid;gap:8px;align-content:start}
.mi{text-align:left;padding:10px 14px;border-radius:10px;border:1px solid var(--line);background:var(--bg2);font-size:.95rem;transition:.15s}
.mi:hover:not(:disabled){border-color:var(--acc)}
.mi.sel{border-color:var(--acc);background:#14305a;box-shadow:0 0 0 2px #4cc9f044}
.mi.ok{border-color:var(--ok);background:#12321f;opacity:.75}
.mi.no{border-color:var(--bad);background:#3a1220}
.order-pool{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px}
.order-pool .mi{flex:1 1 260px}
.order-ans{counter-reset:o;display:grid;gap:6px;margin:0;padding:0;list-style:none}
.order-ans li{counter-increment:o;padding:8px 12px;border-radius:10px;background:#12321f;border:1px solid #7ae58266;font-size:.95rem;animation:pop .25s}
.order-ans li::before{content:counter(o)". ";color:var(--ok);font-weight:800}
.sortcard{font-size:1.2rem;font-weight:700;text-align:center;padding:22px;border-radius:14px;background:var(--bg2);border:1px dashed var(--line);margin-bottom:14px;animation:pop .25s}
.buckets{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px}
.bucket{padding:14px;border-radius:12px;border:1px solid var(--line);background:var(--panel2);font-weight:700}
.bucket:hover{border-color:var(--acc)}
.bucket.ok{border-color:var(--ok);background:#12321f}
.bucket.no{border-color:var(--bad);background:#3a1220}
.shake{animation:shake .35s}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
@keyframes pop{from{transform:scale(.96);opacity:0}}
.sim{display:grid;grid-template-columns:1.5fr 1fr;gap:16px;align-items:start}
.simside{display:grid;gap:12px}
.mactable{width:100%;border-collapse:collapse;font:13px var(--mono)}
.mactable td,.mactable th{padding:6px 10px;border-bottom:1px solid var(--line);text-align:left}
.mactable th{color:var(--mute);font-weight:600}
.mactable tr.new td{color:var(--ok);animation:pop .4s}
.framecard{font:14px var(--mono);padding:12px 14px;border-radius:12px;background:#0b1230;border:1px solid var(--line)}
.btnrow{display:flex;flex-wrap:wrap;gap:8px}
.results{text-align:center;padding:30px 20px}
.results .bigstars{font-size:3rem;letter-spacing:6px;margin:6px 0}
.results .bigstars .off{color:#2b3770}
.results .btnrow{justify-content:center;margin-top:18px}

/* ---------- codex / osi / tools ---------- */
.search{width:100%;padding:12px 16px;border-radius:12px;border:1px solid var(--line);background:var(--bg2);color:var(--text);font-size:1rem;margin-bottom:16px}
.codex{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:10px}
.cx{padding:12px 14px;border-radius:12px;background:var(--bg2);border:1px solid var(--line)}
.cx h4{margin:0 0 4px;color:var(--acc)}
.cx p{margin:0 0 6px;font-size:.92rem}
.cx a{font-size:.78rem}
.osi{display:grid;grid-template-columns:minmax(260px,1fr) 1.4fr;gap:20px}
.osi-stack{display:grid;gap:6px}
.osi-l{display:flex;align-items:center;gap:12px;text-align:left;padding:12px 16px;border-radius:12px;border:1px solid var(--line);background:var(--bg2);transition:.15s}
.osi-l:hover,.osi-l.on{border-color:var(--lc);background:color-mix(in srgb,var(--lc) 14%,var(--bg2))}
.osi-l .num{display:grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--lc);color:#0a0f1f;font-weight:900}
.osi-l small{color:var(--mute);margin-left:auto;font-family:var(--mono)}
.osi-d dl{display:grid;grid-template-columns:120px 1fr;gap:8px 12px;margin:12px 0}
.osi-d dt{color:var(--mute);font-weight:600}
.osi-d dd{margin:0}
.tools{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.tools input{width:100%;padding:10px 14px;border-radius:10px;border:1px solid var(--line);background:#070c1f;color:var(--text);font:15px var(--mono)}
.kv{display:grid;grid-template-columns:150px 1fr;gap:6px 12px;font:14px var(--mono);margin-top:12px}
.kv span:nth-child(odd){color:var(--mute);font-family:system-ui,sans-serif}
.bits{display:grid;grid-template-columns:repeat(8,1fr);gap:6px;margin:12px 0}
.bit{padding:10px 0;border-radius:10px;border:1px solid var(--line);background:var(--bg2);font:700 1.2rem var(--mono);text-align:center}
.bit.on{background:#14305a;border-color:var(--acc);color:var(--acc)}
.bit small{display:block;font-size:.7rem;color:var(--mute);font-weight:400}
.ports{width:100%;border-collapse:collapse;font-size:.92rem}
.ports td,.ports th{padding:6px 10px;border-bottom:1px solid var(--line);text-align:left}
.ports td:first-child{font-family:var(--mono);color:var(--acc)}
.ports th{color:var(--mute)}

#toast{position:fixed;left:50%;bottom:26px;transform:translate(-50%,40px);opacity:0;transition:.35s;background:var(--panel2);border:1px solid var(--acc);padding:12px 20px;border-radius:12px;font-weight:700;z-index:50;box-shadow:0 10px 30px #0008;pointer-events:none}
#toast.show{opacity:1;transform:translate(-50%,0)}

@media (max-width:820px){
  .top{flex-wrap:wrap;padding:10px 16px;gap:10px}
  .rank{min-width:0;width:100%}
  main{padding:16px 16px 60px}
  .hero,.osi,.tools,.sim,.match{grid-template-columns:1fr}
  .tabs{margin-left:0}
  .osi-d dl,.kv{grid-template-columns:110px 1fr}
}

/* ---------- study path + portfolio framing ---------- */
[hidden]{display:none!important}
.track-card{margin-bottom:26px}
.track-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.track-head h2{margin:0;font-size:1.2rem}
.track-head .btn{margin-left:auto}
.trk-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
.trk{display:flex;flex-direction:column;gap:6px}
.trk-row{display:flex;align-items:center;gap:12px;width:100%;text-align:left;padding:12px 14px;border-radius:12px;background:var(--bg2);border:1px solid var(--line);color:var(--text);cursor:pointer;font:inherit;transition:.15s}
.trk-row:hover{border-color:var(--acc)}
.trk-row.on{border-color:var(--acc);box-shadow:0 0 0 1px var(--acc),0 0 18px #4cc9f033}
.trk-row small{display:block;color:var(--mute);font-size:.78rem;margin-top:2px}
.trk-ic{font-size:1.5rem}
.trk-n{margin-left:auto;font-weight:800;color:var(--acc);white-space:nowrap}
.trk-next{font-size:.85rem;padding-left:4px}
.tile .ti{display:flex;justify-content:space-between;align-items:flex-start}
.tile .tb{font-size:.85rem;opacity:.85;margin-right:16px}
.foot{max-width:1200px;margin:10px auto 30px;padding:0 22px;color:var(--mute);font-size:.85rem;text-align:center}
@media (max-width:820px){.trk-grid{grid-template-columns:1fr}.foot{padding:0 16px}}