:root{color-scheme:dark;--ns-bg:#0a101b;--ns-panel:#111b2a;--ns-line:#243448;--ns-text:#e5edf7;--ns-muted:#91a1b6;--ns-accent:#57dfcf;--ns-blue:#80b7ff;--ns-good:#74e5b0;--ns-bad:#ff9c91;--ns-font:"Bahnschrift","Malgun Gothic",sans-serif}
*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 70% 0,rgba(44,84,111,.13),transparent 55%),var(--ns-bg);color:var(--ns-text);font-family:var(--ns-font);font-size:14px;line-height:1.65}button,input{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--ns-accent);outline-offset:4px}[hidden]{display:none!important}h1,h2,h3,p{margin:0}.ns-sr-only,.ns-skip:not(:focus){position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}.ns-skip:focus{position:fixed;top:10px;left:10px;z-index:5;background:var(--ns-accent);color:#071c20;padding:12px}
.ns-topbar{height:74px;border-bottom:1px solid var(--ns-line);padding:0 max(28px,calc((100% - 1376px)/2));display:flex;align-items:center;gap:42px;background:#0c1420}.ns-brand{display:flex;align-items:center;gap:11px;font-weight:700;letter-spacing:1px;font-size:15px;white-space:nowrap}.ns-brand-mark{width:29px;height:31px;display:grid;place-items:center;background:var(--ns-accent);color:#0c2730;border-radius:7px 7px 12px 12px;font-size:18px}.ns-topbar nav{display:flex;align-items:center;gap:15px;color:var(--ns-muted);font-size:12px}.ns-topbar nav [aria-current]{color:#d5e1f0}.ns-mode{margin-left:auto;font-size:11px;color:var(--ns-accent);display:flex;align-items:center;gap:7px;white-space:nowrap}.ns-mode i{height:6px;width:6px;border-radius:50%;background:currentColor}
.ns-page{max-width:1432px;margin:auto;padding:0 28px}.ns-hero{display:grid;grid-template-columns:1.05fr 1fr;gap:70px;align-items:center;padding:46px 0 35px}.ns-eyebrow{font-size:10px;letter-spacing:2px;color:var(--ns-accent);margin-bottom:15px;font-weight:600}.ns-eyebrow span{margin-left:10px;color:#6d8299;font-weight:400;letter-spacing:1px}.ns-hero h1{font-size:clamp(32px,3.1vw,47px);font-weight:700;line-height:1.25;letter-spacing:-1.8px}.ns-hero h1 span{color:var(--ns-accent)}.ns-subtitle{color:var(--ns-muted);font-size:13px;line-height:1.9;margin-top:17px;word-break:keep-all}.ns-hero-tags{display:flex;gap:8px;margin-top:20px}.ns-hero-tags span{font-size:10px;letter-spacing:.5px;border:1px solid #2b3c4d;border-radius:5px;padding:3px 10px;color:#b9cadb}.ns-map{position:relative;overflow:hidden;border:1px solid #2c414f;border-radius:12px;padding:20px 25px;background:radial-gradient(ellipse at 50% 50%,#173b402e,transparent 70%),linear-gradient(#29405324 1px,transparent 1px),linear-gradient(90deg,#29405324 1px,transparent 1px),#0e1a27;background-size:auto,22px 22px,22px 22px,auto}.ns-map-caption{display:flex;justify-content:space-between;gap:8px;color:#72879e;font-size:10px;letter-spacing:1.5px}.ns-map-caption span:last-child{letter-spacing:0}.ns-map-route{display:flex;align-items:center;justify-content:center;margin:29px 0 21px}.ns-node{display:grid;justify-items:center;min-width:80px;gap:3px}.ns-node svg{height:36px;width:36px;color:#90a8c0;margin-bottom:8px}.ns-node strong{font-size:12px;letter-spacing:.5px}.ns-node small{font-size:10px;color:#8b9caf}.ns-node-firewall svg{color:var(--ns-accent);filter:drop-shadow(0 0 8px #57dfcf40)}.ns-node-firewall strong{color:var(--ns-accent)}.ns-connector{height:1px;flex:1;max-width:55px;margin:0 10px 40px;position:relative;background:linear-gradient(90deg,#385566,var(--ns-accent),#385566)}.ns-connector:after{content:"";position:absolute;right:0;top:-2px;width:5px;height:5px;border-top:1px solid var(--ns-accent);border-right:1px solid var(--ns-accent);transform:rotate(45deg)}.ns-map-boundaries{display:flex;gap:8px;justify-content:center}.ns-map-boundaries span{font-size:10px;color:#91a9bc;border:1px solid #304151;border-radius:4px;padding:3px 10px;background:#0a1524}.ns-map-note{text-align:center;color:#71859b;font-size:10px;margin-top:12px}
.ns-stats{border:1px solid var(--ns-line);background:#101a28;border-radius:10px;display:grid;grid-template-columns:repeat(4,1fr);margin-bottom:32px;padding:20px 0}.ns-stat{padding:0 27px;position:relative}.ns-stat+.ns-stat{border-left:1px solid var(--ns-line)}.ns-stat>span{font-size:11px;display:flex;justify-content:space-between;align-items:center;color:var(--ns-muted)}.ns-stat b{color:var(--ns-accent);font-size:11px;font-weight:400}.ns-stat p{line-height:1.3;margin-top:7px}.ns-stat strong{font-size:29px;font-weight:600;letter-spacing:-.5px}.ns-stat small{font-size:11px;color:#8194aa;margin-left:8px}.ns-stat progress{width:100%;height:3px;display:block;appearance:none;border:0;background:#27364a;margin-top:7px}.ns-stat progress::-webkit-progress-bar{background:#27364a;border-radius:5px}.ns-stat progress::-webkit-progress-value{background:var(--ns-accent);border-radius:5px}.ns-stat progress::-moz-progress-bar{background:var(--ns-accent)}
.ns-workspace{display:grid;grid-template-columns:292px minmax(0,1fr);gap:24px;align-items:start;scroll-margin-top:20px}.ns-sidebar{border:1px solid var(--ns-line);border-radius:10px;background:#0e1826;padding:20px 14px}.ns-sidebar-title{display:flex;justify-content:space-between;align-items:center;padding:0 4px;margin-bottom:18px}.ns-sidebar-title h2{font-size:14px}.ns-sidebar-title>span{font-size:10px;color:#8296ad}.ns-search{display:flex;align-items:center;gap:9px;padding:9px 11px;border:1px solid #2a394f;border-radius:6px;background:#0a1220}.ns-search svg{width:17px;height:17px;color:#7d90a7;flex-shrink:0}.ns-search input{min-width:0;width:100%;padding:0;background:none;border:0;color:var(--ns-text);font-size:11px}.ns-search input::placeholder{color:#6e829b}.ns-track-filters{display:flex;gap:4px;margin:13px 0 17px}.ns-chip{font-size:10px;padding:5px 7px;border:1px solid transparent;border-radius:5px;background:transparent;color:#8fa3b9;white-space:nowrap}.ns-chip[aria-pressed="true"]{background:#153336;color:var(--ns-accent);border-color:#2c575a}.ns-lesson-list{display:grid;gap:7px}.ns-lesson-link{width:100%;display:flex;gap:11px;align-items:center;text-align:left;padding:12px 10px;border:1px solid transparent;border-radius:7px;background:transparent}.ns-lesson-link:hover{background:#152334}.ns-lesson-link[aria-current="true"]{background:linear-gradient(100deg,#183538,#142833);border-color:#315a5d}.ns-lesson-code{width:35px;height:35px;display:grid;place-items:center;flex-shrink:0;background:#1a293c;border:1px solid #2c4056;border-radius:6px;color:#94adc5;font-size:10px;font-weight:600}.ns-lesson-link[aria-current="true"] .ns-lesson-code{background:#204548;border-color:#397277;color:var(--ns-accent)}.ns-lesson-info{min-width:0}.ns-lesson-info strong{font-size:11px;font-weight:500;line-height:1.55;display:block;word-break:keep-all}.ns-lesson-info small{color:#8598ad;font-size:9px;display:block;margin-top:5px}.ns-sidebar-note{border-top:1px solid var(--ns-line);margin-top:19px;padding:18px 4px 0}.ns-sidebar-note>span{font-size:9px;letter-spacing:1.2px;color:#7196a4}.ns-sidebar-note p{font-size:10px;color:#7b8fa5;line-height:1.9;margin-top:8px}
.ns-lesson-card{overflow:hidden;border:1px solid var(--ns-line);background:#101a28;border-radius:10px;animation:ns-arrive .25s ease both}.ns-lesson-head{padding:24px 27px;border-bottom:1px solid var(--ns-line);background:linear-gradient(115deg,#152632,#111b2a)}.ns-lesson-meta{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:11px;font-size:10px;color:#92a8bb}.ns-lesson-kicker{color:var(--ns-accent);letter-spacing:1px;font-size:10px}.ns-lesson-title{font-size:22px;line-height:1.5;letter-spacing:-.6px;word-break:keep-all}.ns-lesson-badges{display:flex;gap:7px;margin-top:12px;flex-wrap:wrap}.ns-badge{display:inline-flex;align-items:center;font-size:10px;background:#192d3d;border:1px solid #304354;border-radius:4px;padding:2px 8px;color:#9fb7ca}.ns-badge[data-status="pass"]{background:#193b31;border-color:#315d49;color:var(--ns-good)}.ns-lesson-body{padding:25px 27px}.ns-brief{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:25px;padding-bottom:23px;border-bottom:1px solid var(--ns-line)}.ns-section-title{font-size:12px;font-weight:600;margin-bottom:9px;display:flex;align-items:center;gap:9px}.ns-step{font-size:9px;font-weight:400;color:var(--ns-accent);letter-spacing:1px}.ns-brief p{font-size:11px;color:#9cafc2;line-height:1.9;word-break:keep-all}.ns-controls-grid{display:grid;gap:14px}.ns-control{border:1px solid #27394d;border-radius:7px;padding:15px 16px;background:#0c1624;min-width:0}.ns-control legend{font-size:12px;font-weight:600;padding:0 6px}.ns-control-description{font-size:10px;color:#849bb2;margin-bottom:10px}.ns-options{display:flex;gap:7px;flex-wrap:wrap}.ns-option{display:flex;align-items:center;gap:7px;background:#142133;border:1px solid #2c3c51;padding:8px 11px;border-radius:5px;cursor:pointer;font-size:11px;line-height:1.6;flex:1 1 135px;min-width:0}.ns-option:has(input:checked){background:#173d3c;border-color:#397a73;color:#a0f3de}.ns-option input{accent-color:var(--ns-accent);width:13px;height:13px;margin:0;flex-shrink:0}.ns-control input[type="text"],.ns-control input[type="number"]{width:100%;max-width:460px;background:#172438;border:1px solid #384c64;color:var(--ns-text);border-radius:5px;padding:10px 12px;font-size:12px}.ns-config-preview{margin:15px 0 24px;border:1px solid var(--ns-line);border-radius:6px;overflow:hidden}.ns-config-preview summary{font-size:10px;color:#9cb4c6;padding:10px 14px;cursor:pointer;background:#121f2e}.ns-config-preview pre{padding:13px 16px;font:11px/1.9 Consolas,monospace;margin:0;color:#8ec4c2;background:#09131e;white-space:pre-wrap;overflow-wrap:anywhere}.ns-quiz{border-top:1px solid var(--ns-line);padding-top:21px}.ns-quiz>p{font-size:12px;margin-bottom:13px;color:#ccd9e6}.ns-quiz .ns-options{display:grid}.ns-quiz .ns-option{padding:10px 12px}.ns-actions{display:flex;gap:10px;margin:22px 0}.ns-btn{border-radius:6px;border:1px solid #37655e;background:var(--ns-accent);padding:11px 21px;font-size:12px;font-weight:600;color:#092b2a}.ns-btn:hover{filter:brightness(1.07)}.ns-btn-secondary{background:#172536;border-color:#35465a;color:#9fb2c7;font-weight:400}.ns-result{border:1px dashed #334255;border-radius:7px;padding:18px;font-size:11px;color:#96abbe;scroll-margin-top:20px}.ns-result[data-state="pass"]{background:#11322d;border:1px solid #31624f}.ns-result[data-state="fail"]{background:#261f28;border:1px solid #60404a}.ns-result-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:12px}.ns-result-head strong{font-size:14px;color:#e3edf7}.ns-result-score{font-size:23px;font-weight:600;color:var(--ns-accent)}.ns-result-score small{font-size:11px;color:#91a5b8}.ns-checks{display:grid;gap:8px;margin:12px 0}.ns-check{display:flex;gap:10px;align-items:flex-start}.ns-check-mark{border-radius:4px;padding:1px 5px;font-size:9px;flex-shrink:0;min-width:31px;text-align:center;color:var(--ns-bad);background:#462c35}.ns-check[data-pass="true"] .ns-check-mark{color:var(--ns-good);background:#21493a}.ns-check small{display:block;color:#8298ae;font-size:10px;margin-top:2px}.ns-explanation{margin-top:12px;padding-top:12px;border-top:1px solid #3e4450;font-size:11px;color:#b0c4d2}.ns-evidence{margin-top:19px;font-size:11px;color:#849bb2}.ns-resources{display:flex;gap:10px;flex-wrap:wrap;margin-top:13px;font-size:10px}.ns-resources a{color:var(--ns-blue);border-bottom:1px solid #3e5975}.ns-notice{padding:14px 18px;border:1px solid #625d39;background:#2d2c22;color:#ecdb9b;border-radius:7px;margin-bottom:20px;font-size:12px}.ns-empty,.ns-loading{padding:28px 18px;font-size:12px;color:var(--ns-muted)}.ns-empty button{margin-top:12px}.ns-footer{padding:29px 0;display:flex;justify-content:space-between;gap:12px;color:#71879e;font-size:9px;letter-spacing:.6px}.ns-footer p{letter-spacing:0}.ns-footer-divider{padding:0 8px;color:#395163}
@keyframes ns-arrive{from{opacity:.4;transform:translateY(5px)}to{opacity:1;transform:none}}
@media(min-width:1400px){.ns-hero{padding:50px 0 40px}.ns-sidebar{position:sticky;top:20px}.ns-lesson-info strong{font-size:12px}.ns-option{font-size:12px}.ns-brief p{font-size:12px}}
@media(max-width:1050px){.ns-hero{gap:27px}.ns-map{padding:18px 14px}.ns-topbar{gap:25px}.ns-workspace{grid-template-columns:260px minmax(0,1fr);gap:18px}.ns-lesson-head,.ns-lesson-body{padding:21px}.ns-map-boundaries span{padding:3px 6px}.ns-lesson-title{font-size:20px}.ns-topbar nav{gap:10px}}
@media(max-width:800px){.ns-topbar{height:62px;padding:0 20px}.ns-topbar nav{display:none}.ns-page{padding:0 20px}.ns-hero{grid-template-columns:1fr 1fr;gap:15px;padding:32px 0 25px}.ns-hero h1{font-size:32px}.ns-eyebrow span{display:none}.ns-subtitle{font-size:11px}.ns-map{padding:16px 10px}.ns-map-route{margin:20px 0}.ns-node{min-width:60px}.ns-node small{font-size:9px}.ns-connector{margin-left:2px;margin-right:2px}.ns-map-boundaries{gap:3px}.ns-map-boundaries span{font-size:8px}.ns-stats{margin-bottom:23px}.ns-stat{padding:0 15px}.ns-stat strong{font-size:25px}.ns-workspace{grid-template-columns:1fr}.ns-sidebar{padding:17px}.ns-sidebar-title{margin-bottom:13px}.ns-track-filters{margin:10px 0}.ns-lesson-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:4px}.ns-lesson-link{padding:9px}.ns-sidebar-note{display:none}.ns-brief p{font-size:12px}.ns-footer{flex-direction:column;gap:5px}}
@media(max-width:520px){.ns-page{padding:0 14px}.ns-topbar{padding:0 14px;gap:12px}.ns-brand{font-size:12px;gap:8px}.ns-brand-mark{height:26px;width:25px;font-size:15px}.ns-mode{font-size:9px}.ns-hero{grid-template-columns:1fr;gap:21px;padding-top:28px}.ns-hero h1{font-size:38px}.ns-subtitle{font-size:12px}.ns-map{padding:16px 20px}.ns-map-route{margin:17px 0}.ns-node{min-width:76px}.ns-map-boundaries span{font-size:9px;padding:3px 9px}.ns-hero-tags{margin-top:14px}.ns-stats{grid-template-columns:1fr 1fr;padding:0;overflow:hidden}.ns-stat{padding:16px 18px}.ns-stat:nth-child(3){border-left:0;border-top:1px solid var(--ns-line)}.ns-stat:nth-child(4){border-top:1px solid var(--ns-line)}.ns-stat strong{font-size:25px}.ns-stat p{margin-top:5px}.ns-lesson-list{max-height:230px;overflow-y:auto}.ns-lesson-link{gap:7px;padding:8px 6px;align-items:flex-start}.ns-lesson-code{width:29px;height:30px;font-size:9px}.ns-lesson-info strong{font-size:10px}.ns-lesson-info small{font-size:8px}.ns-lesson-head,.ns-lesson-body{padding:20px 16px}.ns-lesson-title{font-size:20px}.ns-brief{grid-template-columns:1fr;gap:16px}.ns-options{display:grid}.ns-option{font-size:12px}.ns-control{padding:13px 12px}.ns-actions{flex-wrap:wrap}.ns-actions .ns-btn{flex:1;padding:11px}.ns-result-head{align-items:flex-start}.ns-result-head strong{font-size:12px}.ns-result-score{font-size:20px;white-space:nowrap}.ns-footer{font-size:8px}}
@media(prefers-reduced-motion:reduce){.ns-lesson-card{animation:none}*{scroll-behavior:auto!important}}
.ns-lesson-list{scrollbar-width:thin;scrollbar-color:#3a586c transparent}
@media(min-width:521px){.ns-lesson-list{max-height:min(620px,calc(100vh - 300px));overflow-y:auto;overscroll-behavior:contain;padding-right:4px}}

.ns-case-panel{margin:22px 0;border:1px solid var(--ns-line);border-radius:12px;background:linear-gradient(145deg,#142836,#101f2b);min-width:0}.ns-case-panel>summary{cursor:pointer;padding:17px 18px;color:#9aede4;font-weight:700;font-size:13px}.ns-case-body{padding:0 18px 20px;line-height:1.85;font-size:13px;color:#bed0dd;min-width:0}.ns-case-label{font-size:11px;letter-spacing:.06em;color:#77ded6}.ns-case-disclaimer{font-size:11px;color:#8da5b6}.ns-case-questions{padding-left:20px}.ns-case-hint{margin:10px 0;padding:10px 12px;border:1px solid #2c4353;border-radius:8px}.ns-case-hint summary{cursor:pointer;color:#d8ebf5}.ns-case-hint pre{overflow:auto;max-height:260px;font-size:11px;white-space:pre;line-height:1.7}.ns-case-hint dt{color:#a3ebe5;font-weight:700;margin-top:12px}.ns-case-hint dd{margin-left:0}.ns-case-toolbar{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0;align-items:center}.ns-case-toolbar input{min-width:150px;flex:1;padding:10px 12px;border:1px solid #395369;border-radius:8px;background:#0e1b27;color:#e8f6ff;font:inherit}.ns-case-toolbar button{font-size:11px;padding:9px 12px}.ns-case-toolbar button:disabled{opacity:.4;cursor:not-allowed}.ns-case-count{font-size:11px;color:#99b0c0}.ns-case-table-wrap{max-width:100%;max-height:430px;overflow:auto;border:1px solid #30495a;border-radius:8px;overscroll-behavior:contain}.ns-case-table{border-collapse:collapse;font:11px/1.6 Consolas,monospace;white-space:nowrap;min-width:100%}.ns-case-table th{position:sticky;top:0;background:#173244;color:#93eee3;text-align:left;z-index:1}.ns-case-table td,.ns-case-table th{padding:8px 10px;border-bottom:1px solid #263b4b}.ns-case-table tr:nth-child(even){background:#112534}.ns-case-note-label{display:block;color:#d5eaf7;font-weight:600;margin-top:20px}.ns-case-note-label textarea{display:block;box-sizing:border-box;width:100%;margin-top:8px;resize:vertical;padding:12px;border:1px solid #395369;border-radius:8px;background:#0e1b27;color:#eef8ff;font:inherit}.ns-case-body .ns-btn{margin-top:8px}@media(max-width:520px){.ns-case-panel>summary{padding:14px;font-size:12px}.ns-case-body{padding:0 12px 16px;font-size:12px}.ns-case-toolbar input{flex-basis:100%}.ns-case-table-wrap{max-height:310px}}