#it-app{--teal:#0d5c63;--gold:#c98a2f;--ink:#1a1c1e;--muted:#43474e;--bg:#f5f4ef;--card:#fff;--line:#d8d3c4;--code-bg:#0e3a3d;--code-fg:#e9f4f2;--green:#2f7d55;--red:#b23a3a;--radius:12px;--shadow:0 8px 24px #143c3c1a;--font:"Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;--mono:"Consolas","SF Mono",Monaco,"Courier New",monospace;all:initial;box-sizing:border-box;width:100%;font-family:var(--font);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;border-radius:16px;padding:16px;line-height:1.55;display:block}#it-app *{box-sizing:border-box}#it-app h1,#it-app h2,#it-app h3,#it-app h4,#it-app p{margin:0 0 .5em}#it-app strong{color:var(--ink)}#it-app :focus-visible{outline:3px solid var(--gold);outline-offset:2px;border-radius:8px}#it-app .hero{background:linear-gradient(120deg,var(--teal),#164a4f);color:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:22px 22px 20px;position:relative;overflow:hidden}#it-app .hero:after{content:"📡";opacity:.18;font-size:74px;position:absolute;bottom:-18px;right:10px}#it-app .eyebrow{letter-spacing:2px;text-transform:uppercase;opacity:.9;font-size:12px;font-weight:700}#it-app .hero h1{margin:.15em 0;font-size:34px;font-weight:800;line-height:1.05}#it-app .teacher{backdrop-filter:blur(2px);background:#ffffff2e;border-radius:999px;align-items:center;gap:8px;margin-top:8px;padding:6px 12px;font-size:14px;font-weight:700;display:inline-flex}#it-app .tabs{flex-wrap:wrap;gap:8px;margin:16px 0;display:flex}#it-app .tab{appearance:none;cursor:pointer;border:2px solid var(--line);background:var(--card);color:var(--ink);font-family:var(--font);border-radius:999px;padding:9px 14px;font-size:14px;font-weight:700;transition:transform .12s,background .12s,color .12s,border-color .12s}#it-app .tab:hover{border-color:var(--gold);transform:translateY(-1px)}#it-app .tab[aria-selected=true]{background:var(--teal);border-color:var(--teal);color:#fff;box-shadow:0 6px 14px #0d5c6359}#it-app .panel{animation:.25s it-fade;display:none}#it-app .panel.active{display:block}@keyframes it-fade{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}#it-app .card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);margin:14px 0;padding:16px 18px}#it-app .card h2{color:var(--teal);align-items:center;gap:8px;font-size:20px;display:flex}#it-app .card h3{color:var(--ink);font-size:16px}#it-app .tag{background:var(--gold);color:#fff;letter-spacing:.5px;text-transform:uppercase;vertical-align:middle;border-radius:999px;padding:3px 9px;font-size:11px;font-weight:700;display:inline-block}#it-app .tag.teal{background:var(--teal)}#it-app .grid2{grid-template-columns:1fr 1fr;gap:14px;display:grid}#it-app .grid3{grid-template-columns:repeat(3,1fr);gap:12px;display:grid}@media (width<=640px){#it-app .grid2,#it-app .grid3{grid-template-columns:1fr}#it-app .hero h1{font-size:26px}}#it-app ul.it{margin:.3em 0;padding:0;list-style:none}#it-app ul.it li{align-items:flex-start;gap:9px;padding:6px 0 6px 4px;display:flex}#it-app ul.it li .b{flex:none}#it-app .keyterm{border-left:5px solid var(--gold);background:#fbf3e4;border-radius:8px;margin:12px 0;padding:10px 14px}#it-app .keyterm b{color:var(--gold)}#it-app .gap{border-left:5px solid var(--red);color:#7a2828;background:#fdeeee;border-radius:8px;margin:12px 0;padding:10px 14px}#it-app .gap b{color:var(--red)}#it-app .scroll{border:1px solid var(--line);border-radius:10px;overflow-x:auto}#it-app table{border-collapse:collapse;background:#fff;width:100%;min-width:420px;font-size:14px}#it-app th{background:var(--teal);color:#fff;text-align:left;padding:9px 12px;font-weight:700}#it-app td{border-top:1px solid var(--line);padding:8px 12px}#it-app tr:nth-child(2n) td{background:#f6faf9}#it-app .mono{font-family:var(--mono)}#it-app .cards{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;display:grid}#it-app .flip{perspective:900px;cursor:pointer;height:130px}#it-app .flip .inner{width:100%;height:100%;transform-style:preserve-3d;transition:transform .5s;position:relative}#it-app .flip.on .inner{transform:rotateY(180deg)}#it-app .flip .side{backface-visibility:hidden;text-align:center;box-shadow:var(--shadow);border-radius:10px;flex-direction:column;justify-content:center;padding:12px;display:flex;position:absolute;inset:0}#it-app .flip .front{background:var(--teal);color:#fff;font-size:15px;font-weight:800}#it-app .flip .front small{opacity:.85;margin-top:6px;font-size:11px;font-weight:600}#it-app .flip .back{border:2px solid var(--gold);color:var(--ink);background:#fff;font-size:13px;transform:rotateY(180deg)}#it-app .acc{border:1px solid var(--line);background:#fff;border-radius:10px;margin:10px 0;overflow:hidden}#it-app .acc .head{cursor:pointer;color:var(--ink);background:#f2f8f7;justify-content:space-between;align-items:center;gap:10px;padding:12px 14px;font-weight:700;display:flex}#it-app .acc .head:hover{background:#e6f2f0}#it-app .acc .chev{color:var(--gold);font-weight:900;transition:transform .2s}#it-app .acc.on .chev{transform:rotate(90deg)}#it-app .acc .body{border-top:1px dashed var(--line);padding:12px 14px;display:none}#it-app .acc.on .body{display:block}#it-app .tool{color:#eafaf6;border-radius:var(--radius);box-shadow:var(--shadow);background:linear-gradient(#0e3a3d,#164a4f);padding:16px}#it-app .tool h3{color:#fff}#it-app .tool input[type=text]{width:100%;font-family:var(--mono);border:none;border-radius:8px;margin:8px 0;padding:10px 12px;font-size:15px}#it-app .domainviz{font-family:var(--mono);flex-wrap:wrap;gap:6px;margin:10px 0;font-size:14px;display:flex}#it-app .dpart{border-radius:6px;padding:6px 10px;font-weight:800}#it-app .dpart.third{background:#ffffff26}#it-app .dpart.second{background:#c98a2f66}#it-app .dpart.tld{background:#40bf4a59}#it-app .dpart.dot{opacity:.6;background:0 0;padding:6px 2px}#it-app .dlabel{opacity:.8;margin-top:4px;font-size:11px}#it-app .abtn{cursor:pointer;font-weight:800;font-family:var(--font);color:#fff;background:var(--teal);border:none;border-radius:8px;padding:8px 14px;transition:all .12s}#it-app .abtn:hover{filter:brightness(1.1)}#it-app .chips{flex-wrap:wrap;gap:6px;margin-top:8px;display:flex}#it-app .chip{cursor:pointer;font-family:var(--mono);background:#ffffff1f;border:1px solid #ffffff40;border-radius:999px;padding:4px 10px;font-size:12px}#it-app .chip:hover{background:#ffffff38}#it-app .netgrid{grid-template-columns:repeat(3,1fr);gap:12px;display:grid}@media (width<=640px){#it-app .netgrid{grid-template-columns:1fr}}#it-app .netcard{border:2px solid var(--line);text-align:center;background:#fff;border-radius:10px;padding:12px}#it-app .netcard h3{margin:0 0 4px}#it-app .q{border:1px solid var(--line);background:#fff;border-radius:10px;margin:14px 0;padding:14px}#it-app .q .opts{flex-direction:column;gap:8px;margin-top:8px;display:flex}#it-app .opt{cursor:pointer;text-align:left;border:2px solid var(--line);color:var(--ink);font-family:var(--font);background:#fff;border-radius:9px;padding:10px 12px;font-size:14px;font-weight:600;transition:all .12s}#it-app .opt:hover{border-color:var(--teal)}#it-app .opt.correct{border-color:var(--green);color:#0c7a54;background:#e6faf1}#it-app .opt.wrong{color:#c0392b;background:#fdeef2;border-color:#c0392b}#it-app .opt:disabled{cursor:default}#it-app .fb{min-height:18px;margin-top:8px;font-size:13px;font-weight:700}#it-app .score{color:var(--teal);margin-top:6px;font-size:16px;font-weight:800}#it-app .foot{text-align:center;color:var(--muted);margin-top:14px;font-size:12px}@media (prefers-reduced-motion:reduce){#it-app *{transition:none!important;animation:none!important}#it-app .flip .inner{transition:none}}.unit-page[data-astro-cid-es6ukbwh]{max-width:1200px;margin:0 auto;padding:clamp(2rem,6vw,3.5rem) clamp(1.25rem,4vw,1.5rem) 5rem}.back-link[data-astro-cid-es6ukbwh]{font-family:var(--font-mono);letter-spacing:.05em;color:var(--ink-muted);margin-bottom:1.5rem;font-size:.78rem;text-decoration:none;display:inline-block}.back-link[data-astro-cid-es6ukbwh]:hover{color:var(--ink)}.unit-meta[data-astro-cid-es6ukbwh]{justify-content:space-between;align-items:center;gap:1rem;margin-bottom:1.5rem;display:flex}.eyebrow[data-astro-cid-es6ukbwh]{font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--ink-muted);align-items:center;gap:.55rem;margin:0;font-size:.78rem;display:flex}.eyebrow-dot[data-astro-cid-es6ukbwh]{background:var(--stamp-progress);border-radius:50%;flex-shrink:0;width:.5rem;height:.5rem}