:root{
  --bg:#0b1117; --panel:#101921; --panel2:#0e161d; --line:#1d2a34; --line2:#26363f;
  --accent:#7dd3c7; --accent-d:#3f8f86; --muted:#9db1b9; --text:#e6eef0; --warm:#f2c879; --bad:#f08a8a;
  --radius:14px;
  --font:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:var(--accent)}
code{font-family:var(--mono);font-size:.88em;background:#14212a;border:1px solid var(--line);border-radius:6px;padding:.08em .38em;color:#cfe9e4}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip{position:absolute;left:12px;top:-60px;z-index:50;background:var(--accent);color:#0b1117;font-weight:600;padding:8px 14px;border-radius:10px;text-decoration:none}
.skip:focus{top:12px}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* preview banner */
.banner{background:repeating-linear-gradient(135deg,#2a2412 0 14px,#231f10 14px 28px);border-bottom:1px solid #4a3e1c;color:var(--warm);font-size:.9rem;text-align:center;padding:8px 16px}
.banner strong{color:#ffe2a3}

/* header */
header.top{position:sticky;top:0;z-index:20;background:rgba(11,17,23,.86);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.top .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:60px}
.brand{color:var(--text);text-decoration:none;font-weight:650;letter-spacing:.2px;white-space:nowrap}
.brand span{color:var(--muted);font-weight:500}
.brand span::before{content:"|";margin:0 .5em;color:var(--line2)}
.top .right{display:flex;align-items:center;gap:18px}
.backlink{font-size:.85rem;color:var(--muted);text-decoration:none;white-space:nowrap;border:1px solid var(--line2);border-radius:99px;padding:4px 12px;transition:all .2s}
.backlink:hover,.backlink:focus-visible{color:var(--accent);border-color:var(--accent-d);outline:none}

/* hero */
.hero{padding:48px 20px 10px;position:relative}
.hero::before{content:"";position:absolute;inset:-30% 0 auto;height:480px;background:radial-gradient(closest-side,rgba(125,211,199,.11),transparent 70%);pointer-events:none;z-index:-1}
.eyebrow{font-family:var(--mono);color:var(--accent);font-size:.82rem;letter-spacing:.14em;text-transform:uppercase}
.hero h1{font-size:clamp(2rem,4.6vw,3.2rem);line-height:1.12;margin:.35em 0 .3em;letter-spacing:-.02em}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p.lead{color:var(--muted);max-width:760px;font-size:1.06rem;margin:0}
.hero p.lead b{color:var(--text);font-weight:600}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.chip{font-size:.8rem;color:var(--muted);border:1px solid var(--line2);border-radius:99px;padding:4px 12px;background:var(--panel2)}
.proto{margin:18px 0 0;color:var(--muted);font-size:.88rem;max-width:820px}
.proto .tag{display:inline-block;margin-right:8px;font-family:var(--mono);font-size:.74rem;letter-spacing:.06em;text-transform:uppercase;color:var(--warm);border:1px solid #4a3e1c;background:#1d1a10;border-radius:99px;padding:2px 10px}

.xlink{margin:12px 0 0;font-size:.92rem}
.xlink a{text-decoration:none;border-bottom:1px solid var(--accent-d)}
.xlink a:hover,.xlink a:focus-visible{border-bottom-color:var(--accent)}

/* scenario buttons */
.sim{padding-top:22px;scroll-margin-top:70px}
.scen{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px}
.sbtn{appearance:none;text-align:left;border:1px solid var(--line2);background:var(--panel2);color:var(--text);border-radius:12px;padding:10px 12px;font:inherit;cursor:pointer;transition:border-color .2s,background .2s,transform .2s;min-width:0}
.sbtn b{display:block;font-size:.92rem;font-weight:620;line-height:1.25}
.sbtn span{display:block;font-size:.78rem;color:var(--muted);line-height:1.3;margin-top:2px}
.sbtn:hover{border-color:var(--accent-d)}
.sbtn[aria-pressed="true"]{border-color:var(--accent);background:linear-gradient(180deg,#123029,#0f1f1d)}
.sbtn[aria-pressed="true"] span{color:#bfe6df}
.sbtn[data-s="healthy"][aria-pressed="true"]{background:linear-gradient(180deg,#14261f,#0f1a17)}
@media (max-width:980px){.scen{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:520px){.scen{grid-template-columns:repeat(2,minmax(0,1fr))}.sbtn{padding:9px 10px}.sbtn b{font-size:.86rem}}

/* stage */
.stage{margin-top:14px;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-radius:20px;padding:12px;overflow:hidden}
.hud{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:8px;margin-bottom:8px}
.hud div{background:#0c141a;border:1px solid var(--line);border-radius:10px;padding:6px 10px;min-width:0}
.hud span{display:block;font-size:.7rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.hud b{display:block;font-family:var(--mono);font-size:.88rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hud b.ok{color:var(--accent)} .hud b.warn{color:var(--warm)} .hud b.bad{color:var(--bad)}
@media (max-width:900px){.hud{grid-template-columns:repeat(2,minmax(0,1fr))}.hud div:last-child{grid-column:1/-1}}
.scene{position:relative}
.scene svg{display:block;width:100%;height:auto;margin:0 auto;border-radius:12px}
.scene svg.v{max-width:480px}
.scene-foot{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:6px 16px;padding:6px 6px 0}
.inspect{margin:0;color:var(--muted);font-size:.86rem;flex:1 1 320px;min-height:1.4em}
.inspect b{color:var(--text)}
.legend{display:flex;flex-wrap:wrap;gap:12px;font-size:.78rem;color:var(--muted)}
.legend span{display:inline-flex;align-items:center;gap:6px}
.lg{display:inline-block;width:18px;height:0;border-top:3px solid}
.lg.pw{border-color:var(--warm);border-top-style:dashed}
.lg.dt{border-color:var(--accent)}
.lg.bf{border-color:#ffb86b}
.lg.ft{border-color:var(--bad);border-top-style:dotted}

/* svg scene */
svg text{font-family:var(--font);fill:var(--text)}
.sky-stop-top{transition:stop-color .6s}
.frame{fill:#0d1820;stroke:var(--line2);stroke-width:1}
.panel{fill:#1b3a52;stroke:#2f5b78;stroke-width:1;transition:fill .5s,opacity .5s}
.panel.dim{fill:#162530;stroke:#24343f}
.panel.down{fill:#141c22;stroke:#5a2f33;stroke-dasharray:3 3}
.glint{stroke:rgba(255,255,255,.08);stroke-width:1}
.pw{fill:none;stroke:#3a321c;stroke-width:5;stroke-linecap:round;stroke-linejoin:round}
.pwf{fill:none;stroke:var(--warm);stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:5 9;animation:pwflow 1s linear infinite;transition:opacity .5s}
@keyframes pwflow{to{stroke-dashoffset:-14}}
.dl{fill:none;stroke:#1f4e4a;stroke-width:4;stroke-linecap:round;stroke-linejoin:round;transition:stroke .4s}
.dl.live{stroke:#2a6a63}
.dl.idle{stroke:#1a2a30}
.dl.bad{stroke:var(--bad);stroke-dasharray:4 6}
.route{fill:none;stroke:none}
.pk{fill:var(--accent);filter:drop-shadow(0 0 4px rgba(125,211,199,.85))}
.pk.rq{fill:#bfe6df;opacity:.75}
.pk.up{fill:var(--accent)}
.pk.hb{fill:#9db1b9;opacity:.8}
.pk.bf{fill:#ffb86b;filter:drop-shadow(0 0 5px rgba(255,184,107,.9))}
.pk.held{fill:var(--warm)}
.fx-x{fill:var(--bad);font:700 18px var(--font);text-anchor:middle;dominant-baseline:central;animation:fxx .9s ease-out forwards}
@keyframes fxx{0%{opacity:0;transform:scale(.6)}20%{opacity:1;transform:scale(1.15)}100%{opacity:0;transform:scale(1)}}
.fx-x{transform-box:fill-box;transform-origin:center}
.term rect{fill:#0d151c;stroke:var(--muted);stroke-width:1}
.term text{fill:var(--muted);font:600 9px var(--mono);text-anchor:middle;dominant-baseline:central}
.lbl{fill:var(--muted);font:500 12px var(--mono)}
.lbl.s{font-size:11px}
.node{cursor:pointer;outline:none}
.node .box{fill:#0d151c;stroke:var(--accent-d);stroke-width:2;transition:stroke .3s,fill .3s}
.node .t1{font:650 15px var(--font);text-anchor:middle;dominant-baseline:central;pointer-events:none}
.node .t2{font:500 12px var(--mono);fill:var(--muted);text-anchor:middle;dominant-baseline:central;pointer-events:none}
.node .led{fill:var(--accent);animation:led 1.6s ease-in-out infinite}
@keyframes led{50%{opacity:.25}}
.node .scan{fill:none;stroke:var(--accent);stroke-width:2;opacity:0;stroke-dasharray:6 6}
.node.focus .scan{opacity:.9;animation:scan 1.2s linear infinite}
@keyframes scan{to{stroke-dashoffset:-24}}
.node:hover .box,.node:focus-visible .box{stroke:var(--accent);fill:#12212a}
.node:focus-visible .scan{opacity:1;stroke-dasharray:none}
.node.warn .box{stroke:var(--warm)}
.node.warn .led{fill:var(--warm)}
.node.bad .box{stroke:var(--bad);fill:#1d1215}
.node.bad .led{fill:var(--bad);animation:none}
.node.frozen .led{animation:none;opacity:1}
.node.boot .led{fill:var(--warm);animation:led .35s steps(2) infinite}
.node.rx .box{fill:#123029}
.badge{opacity:0;transition:opacity .3s;pointer-events:none}
.badge.show{opacity:1}
.badge circle{fill:var(--accent);stroke:#0b1117;stroke-width:2}
.badge text{fill:#0b1117;font:800 13px var(--font);text-anchor:middle;dominant-baseline:central}
.badge.fail circle{fill:var(--bad)}
.badge.info circle,.badge.fixed circle{fill:var(--warm)}
.bars rect{fill:#1d2a34;transition:fill .3s}
.bars rect.on{fill:var(--accent)}
.node.bad .bars rect.on{fill:var(--bad)}
.ant{stroke:var(--muted);stroke-width:2;fill:none}
.buf-bg{fill:#16232c}
.buf-fill{fill:var(--warm);transition:width .25s}
.cloud{fill:#0d151c;stroke:var(--accent-d);stroke-width:2}
.node.bad .cloud{stroke:var(--bad)}
.node:hover .cloud,.node:focus-visible .cloud{stroke:var(--accent)}
.pylon{fill:none;stroke:var(--muted);stroke-width:1.6;stroke-linejoin:round}
.sunc{fill:#ffd27a;filter:drop-shadow(0 0 10px rgba(255,210,122,.75))}
.sunray{stroke:#ffd27a;stroke-width:2;stroke-linecap:round;opacity:.55}
/* portal */
.screen{fill:#0a1015;stroke:var(--accent-d);stroke-width:2}
.node.warn .screen{stroke:var(--warm)} .node.bad .screen{stroke:var(--bad)}
.node:hover .screen,.node:focus-visible .screen{stroke:var(--accent)}
.ptitle{font:650 13px var(--font)}
.pill rect{fill:#123029;stroke:var(--accent-d)}
.pill text{fill:var(--accent);font:700 10px var(--mono);text-anchor:middle;dominant-baseline:central;letter-spacing:.06em}
.pill.warn rect{fill:#2a2412;stroke:#6d5a26} .pill.warn text{fill:var(--warm)}
.pill.bad rect{fill:#2a1416;stroke:#7a3a3f} .pill.bad text{fill:var(--bad)}
.ch-axis{stroke:#1d2a34;stroke-width:1}
.ch-exp{fill:none;stroke:#6b7f88;stroke-width:1.5;stroke-dasharray:4 4}
.ch-act{fill:none;stroke:var(--accent);stroke-width:2;stroke-linejoin:round}
.ch-area{fill:rgba(125,211,199,.12)}
.ch-bf{fill:none;stroke:#ffb86b;stroke-width:2.2}
.ch-stale{fill:none;stroke:var(--warm);stroke-width:2;stroke-dasharray:2 3}
.ch-gap{fill:url(#hatch);stroke:rgba(240,138,138,.6);stroke-width:1}
.ch-now{stroke:var(--muted);stroke-width:1;stroke-dasharray:2 3}
.pnote{fill:var(--muted);font:500 10.5px var(--mono)}
.rec rect{fill:#16232c;stroke:var(--line2)} .rec text{font:700 9.5px var(--mono);fill:var(--muted);text-anchor:middle;dominant-baseline:central}
.rec.hold rect{fill:#2a1416;stroke:#7a3a3f} .rec.hold text{fill:var(--bad)}
.rec.ready rect{fill:#123029;stroke:var(--accent-d)} .rec.ready text{fill:var(--accent)}

/* walkthrough */
.walk{margin-top:14px;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-radius:20px;padding:16px}
.rail{list-style:none;margin:0 0 12px;padding:0;display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;position:relative}
.rstep{appearance:none;width:100%;display:flex;align-items:center;gap:8px;border:1px solid var(--line2);background:#0c141a;color:var(--muted);border-radius:10px;padding:7px 9px;font:inherit;font-size:.82rem;cursor:pointer;transition:all .25s;min-width:0}
.rstep i{font-style:normal;flex:none;width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:.75rem;font-weight:700;background:#16232c;color:var(--muted);transition:all .25s}
.rstep span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.rstep:hover:not(:disabled){border-color:var(--accent-d);color:var(--text)}
.rstep:disabled{cursor:default;opacity:.45}
.rstep[aria-current="step"]{border-color:var(--accent);color:var(--text);background:#10221f}
.rstep[aria-current="step"] i{background:var(--accent);color:#0b1117}
.rstep.pass i,.rstep.fixed i{background:#1d4a44;color:var(--accent)}
.rstep.fail i{background:#4a2226;color:var(--bad)}
.rstep.info i{background:#4a3e1c;color:var(--warm)}
@media (max-width:760px){.rail{grid-template-columns:repeat(3,minmax(0,1fr))}.rstep{padding:6px 7px;gap:6px;font-size:.78rem;min-height:44px}.rstep span{white-space:normal;line-height:1.2;text-overflow:clip}.rstep i{width:20px;height:20px}}
.tgl:has(input:disabled){opacity:.5;cursor:default}
@media (max-width:440px){.rstep i{display:none}.rstep{justify-content:center;text-align:center}.rstep.pass,.rstep.fixed{border-color:#1d4a44}.rstep.fail{border-color:#7a3a3f}.rstep.info{border-color:#6d5a26}.hud b{white-space:normal}}
.panel{min-height:300px;outline:none}
.pc{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:14px 22px}
@media (max-width:860px){.pc{grid-template-columns:minmax(0,1fr)}}
.pc .full{grid-column:1/-1}
.phead{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px}
.phead .layer{font-family:var(--mono);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}
.phead h3{margin:0;font-size:1.25rem;letter-spacing:-.01em;flex-basis:100%}
.res{font:700 .72rem var(--mono);letter-spacing:.08em;border-radius:99px;padding:2px 10px;border:1px solid}
.res.pass,.res.fixed{color:var(--accent);border-color:var(--accent-d);background:#10221f}
.res.fail{color:var(--bad);border-color:#7a3a3f;background:#2a1416}
.res.info{color:var(--warm);border-color:#6d5a26;background:#2a2412}
.pblock h4{margin:0 0 4px;font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:600}
.pblock p{margin:0;color:#d5e2e5}
.term{margin:0;background:#081016;border:1px solid var(--line);border-radius:12px;padding:12px 14px;font:12.5px/1.65 var(--mono);color:#cfe9e4;overflow-x:auto;white-space:pre-wrap;word-break:break-word}
.term .ln{display:grid;grid-template-columns:17ch minmax(0,1fr);column-gap:1ch}
.term .ln .v.full{grid-column:1/-1}
.term .ln .k:empty{min-height:0}
@media (max-width:560px){.term .ln{grid-template-columns:minmax(0,1fr);margin-bottom:6px}.term .ln .k{color:var(--muted);font-size:.92em}.term .ln .k:empty{display:none}}
.term .ln.bad{color:var(--bad)} .term .ln.warn{color:var(--warm)} .term .ln.ok{color:var(--accent)}
.finding{border-left:3px solid var(--accent);padding:8px 12px;background:#0e1c1c;border-radius:0 10px 10px 0}
.finding.fail{border-color:var(--bad);background:#1d1215}
.finding.info{border-color:var(--warm);background:#1d1a10}
.action{margin-top:10px!important;font-size:.93rem;color:var(--muted)!important}
.action b{color:var(--text)}
.links{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.links a{font-size:.84rem;text-decoration:none;border:1px solid var(--line2);border-radius:99px;padding:4px 12px;color:var(--accent);background:#0c141a;transition:border-color .2s}
.links a:hover,.links a:focus-visible{border-color:var(--accent)}
.links .lab{font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-right:2px}
.tk{display:flex;flex-wrap:wrap;gap:6px 12px;align-items:baseline;font-family:var(--mono);font-size:.85rem;color:var(--muted)}
.tk b{color:var(--warm)}
.quote{margin:0;font-size:1.05rem;color:var(--text)}
.healthy-list{margin:0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.healthy-list li{background:#0c141a;border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:.9rem;color:var(--muted)}
.healthy-list b{display:block;color:var(--text);margin-bottom:2px}
@media (max-width:860px){.healthy-list{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:460px){.healthy-list{grid-template-columns:minmax(0,1fr)}}
.rv{opacity:0;transform:translateY(6px);animation:rv .45s cubic-bezier(.2,.8,.2,1) forwards;animation-delay:var(--d,0ms)}
@keyframes rv{to{opacity:1;transform:none}}
.ctrl{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:16px;padding-top:14px;border-top:1px solid var(--line)}
.btn{appearance:none;border:1px solid var(--line2);background:#0f1a21;color:var(--text);border-radius:10px;padding:8px 14px;font:inherit;font-size:.9rem;cursor:pointer;transition:all .2s}
.btn:hover,.btn:focus-visible{border-color:var(--accent)}
.btn:disabled{opacity:.4;cursor:default}
.btn.primary{background:var(--accent);color:#0b1117;border-color:var(--accent);font-weight:650}
.btn.primary:hover,.btn.primary:focus-visible{background:#9be3d9}
.btn.ghost{background:transparent;color:var(--muted)}
.tgl{margin-left:auto;display:inline-flex;align-items:center;gap:8px;font-size:.86rem;color:var(--muted);cursor:pointer}
.tgl input{accent-color:var(--accent);width:16px;height:16px}
@media (max-width:560px){.ctrl .btn{flex:1 1 auto}.tgl{margin-left:0}}

/* content blocks */
.block{padding:46px 20px 6px}
.block h2{font-size:1.6rem;letter-spacing:-.01em;margin:0 0 6px}
.block .sub{color:var(--muted);max-width:760px;margin:0 0 18px}
.order{list-style:none;counter-reset:o;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.order li{counter-increment:o;background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-radius:var(--radius);padding:16px;position:relative}
.order li::before{content:counter(o);display:grid;place-items:center;width:28px;height:28px;border-radius:50%;background:#123029;color:var(--accent);font-weight:700;font-size:.85rem;margin-bottom:8px}
.order b{display:block;margin-bottom:4px}
.order span{color:var(--muted);font-size:.92rem}
@media (max-width:900px){.order{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.order{grid-template-columns:minmax(0,1fr)}}
.kit{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.kcard{display:block;text-decoration:none;color:var(--text);background:linear-gradient(180deg,var(--panel),var(--panel2));border:1px solid var(--line);border-radius:var(--radius);padding:14px 16px;transition:border-color .2s,transform .2s}
.kcard:hover,.kcard:focus-visible{border-color:var(--accent-d);transform:translateY(-2px)}
.kcard em{font-style:normal;font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
.kcard b{display:block;margin:2px 0 4px}
.kcard span{display:block;color:var(--muted);font-size:.88rem}
.scope p{color:var(--muted);max-width:860px;font-size:.93rem}

/* footer */
footer{margin-top:40px;border-top:1px solid var(--line);color:var(--muted);font-size:.86rem;padding:26px 0 40px}
footer .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
footer a{color:var(--muted)}
footer a:hover,footer a:focus-visible{color:var(--accent)}
@media (max-width:560px){.top .right{gap:10px}.brand span{display:none}.hero{padding-top:34px}.walk{padding:12px}.stage{padding:8px;border-radius:16px}}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .rv{opacity:1;transform:none;animation:none}
  .pwf{animation:none;stroke-dasharray:none;opacity:.85}
  .node .led{animation:none}
  .node.focus .scan{animation:none}
  .fx-x{display:none}
}