.hero{padding-block:52px 44px}
.hero h1{font-family:var(--mono);font-weight:700;font-size:clamp(28px,4.6vw,48px);line-height:1.12;margin:0 0 16px;text-wrap:balance;letter-spacing:-.02em;max-width:20ch}
.hero h1 em{font-style:normal;color:var(--accent)}
.hero p.lead{font-size:18px;color:var(--muted);max-width:58ch;margin:0 0 26px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:40px}
.label{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin:0 0 10px}
.cta-row .btn.primary{background:var(--accent);color:var(--accent-ink)}.cta-row .btn.ghost{background:transparent;color:var(--accent)}
/* switch front panel */
.switch{background:var(--chassis);border:1px solid var(--line);padding:14px 16px 16px;min-width:0}
.sw-head{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap;font-family:var(--mono);font-size:11px;color:var(--muted);margin-bottom:12px;letter-spacing:.08em}
.sw-head b{color:var(--fg);font-size:12px}
.sw-body{display:flex;gap:22px;align-items:flex-start;overflow-x:auto;padding-bottom:4px}
.ports{flex:1 1 auto;min-width:640px;display:grid;grid-template-columns:repeat(24,minmax(0,1fr));gap:0 2px}
.pcol{min-width:0;display:flex;flex-direction:column;align-items:center;gap:2px}
.phd{display:flex;flex-direction:column;align-items:center;gap:3px;margin-bottom:2px;font-family:var(--mono);font-size:8px;line-height:1;color:var(--muted);white-space:nowrap}
.leds{display:grid;grid-template-columns:1fr 1fr;width:100%;max-width:22px;justify-items:center}
.nums{display:flex;flex-direction:column;align-items:center;gap:2px}
.nums{font-size:8px}
.jack{width:100%;max-width:34px;height:22px;background:var(--port);border:1px solid var(--line);position:relative}
.jack::before{content:"";position:absolute;left:25%;right:25%;top:-1px;height:4px;background:var(--chassis)}
.jack.bot::before{top:auto;bottom:-1px}
.jack::after{content:"";position:absolute;left:4px;right:4px;bottom:3px;height:3px;background:repeating-linear-gradient(90deg,var(--muted) 0 2px,transparent 2px 4px);opacity:.55}
.jack.bot::after{bottom:auto;top:3px}
.led{width:6px;height:6px;border-radius:50%;background:var(--line);flex:none}
.led.on{background:var(--accent);box-shadow:0 0 5px var(--accent)}
.led.act{background:var(--warn);box-shadow:0 0 5px var(--warn)}
.led.tr{background:var(--trunk);box-shadow:0 0 5px var(--trunk)}
.sfp{flex:none;display:grid;grid-template-columns:repeat(2,38px);gap:2px 6px;padding-left:18px;border-left:1px solid var(--line)}
.sfp .jack{max-width:38px}.sfp .pcol{width:38px}
.legend{display:flex;gap:6px 18px;flex-wrap:wrap;margin-top:12px;font-family:var(--mono);font-size:12px;color:var(--muted)}
.legend span::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:6px;background:var(--c)}

.landing section{padding-block:48px;border-top:1px solid var(--line)}
h2{font-family:var(--mono);font-size:clamp(22px,3vw,30px);line-height:1.2;margin:0 0 12px;letter-spacing:-.01em;text-wrap:balance}
.sub{color:var(--muted);max-width:62ch;margin:0 0 28px}

/* show interface brief */
.table-scroll{overflow-x:auto;border:1px solid var(--line);background:var(--surface)}
table.sib{border-collapse:collapse;width:100%;font-family:var(--mono);font-size:13.5px;min-width:720px}
.sib th{text-align:left;font-weight:500;color:var(--muted);padding:11px 16px;border-bottom:1px solid var(--line);font-size:12px;letter-spacing:.06em;text-transform:uppercase}
.sib td{padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top}
.sib tr:last-child td{border-bottom:0}
.sib td.pt{color:var(--accent);white-space:nowrap}
.sib td.nm b{display:block;font-size:14.5px;margin-bottom:2px}
.sib td.nm span{font-family:var(--sans);color:var(--muted);font-size:14px}
.st{display:inline-block;padding:2px 8px;border:1px solid var(--line);font-size:12px;white-space:nowrap}
.st.up{color:var(--accent);border-color:var(--accent)}
.st.dn{color:var(--warn);border-color:var(--warn)}
.vl{white-space:nowrap}

/* topics as ports */
.topics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.tile{border:1px solid var(--line);background:var(--surface);padding:14px 16px;min-width:0}
.tile b{font-family:var(--mono);font-size:14px;display:block;margin-bottom:2px}
.tile span{color:var(--muted);font-size:14px}
.tile em{font-style:normal;font-family:var(--mono);font-size:11px;color:var(--accent);display:block;margin-bottom:6px}

/* topology + cli */
.labgrid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:24px;align-items:start}
.topo{border:1px solid var(--line);background:var(--surface);padding:12px;min-width:0}
.topo svg{display:block;width:100%;height:auto}
.topo text{font-family:var(--mono);font-size:11px;fill:var(--fg)}
.topo .dim{fill:var(--muted);font-size:10px}
.topo .box{fill:var(--chassis);stroke:var(--line);stroke-width:1.5}
.cli{border:1px solid var(--line);background:var(--surface);min-width:0}
.tabs{display:flex;border-bottom:1px solid var(--line)}
.tabs button{font-family:var(--mono);font-size:13px;background:none;border:0;border-right:1px solid var(--line);color:var(--muted);padding:10px 16px;cursor:pointer}
.tabs button[aria-selected="true"]{color:var(--accent);background:var(--bg)}
.cli pre{margin:0;padding:16px;font-family:var(--mono);font-size:13px;line-height:1.7;overflow-x:auto;color:var(--fg)}
.cli .c{color:var(--muted)}
.cli .k{color:var(--accent)}
.cli p{margin:0;padding:12px 16px;border-top:1px solid var(--line);color:var(--muted);font-size:14px}

/* free */
.free{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px;align-items:start}
.calc{background:var(--surface);border:1px solid var(--line);padding:20px;min-width:0}
.calc label{font-family:var(--mono);font-size:12px;color:var(--muted);display:block;margin-bottom:6px}
.calc .in{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:16px}
.calc input{font-family:var(--mono);font-size:15px;background:var(--bg);color:var(--fg);border:1px solid var(--line);padding:10px 12px;min-width:0;flex:1 1 150px}
.calc input.pre{flex:0 1 90px}
dl.out{margin:0;display:grid;grid-template-columns:auto minmax(0,1fr);gap:6px 18px;font-family:var(--mono);font-size:14px}
dl.out dt{color:var(--muted)}
dl.out dd{margin:0;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}
.err{color:var(--warn);font-family:var(--mono);font-size:13px;min-height:20px;margin:0 0 8px}
.signup{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.signup input{font-family:var(--mono);font-size:14px;background:var(--surface);color:var(--fg);border:1px solid var(--line);padding:12px;flex:1 1 220px;min-width:0}
.signup button{font-family:var(--mono);font-size:14px;background:var(--accent);color:var(--accent-ink);border:0;padding:12px 18px;cursor:pointer}
.note{font-family:var(--mono);font-size:12px;color:var(--muted);margin-top:10px;min-height:18px}
ul.clean{list-style:none;margin:0;padding:0;display:grid;gap:8px}
ul.clean li{font-family:var(--mono);font-size:14px}
ul.clean li::before{content:"$ ";color:var(--accent)}

.lesson{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:1px solid var(--line);background:var(--surface)}
.lesson > div{padding:22px;border-right:1px solid var(--line)}
.lesson > div:last-child{border-right:0}
.lesson h3{font-family:var(--mono);font-size:15px;margin:0 0 6px;color:var(--accent)}
.lesson p{margin:0;color:var(--muted);font-size:15px}

.about{display:grid;grid-template-columns:200px minmax(0,1fr);gap:32px;align-items:start}
.photo-ph{aspect-ratio:1/1;max-width:100%;border:1.5px dashed var(--muted);display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-size:12px;color:var(--muted);text-align:center;padding:12px}
.about p{margin:0 0 14px;max-width:62ch}
.ph{font-family:var(--mono);font-size:.92em;color:var(--warn)}
.facts{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.facts span{font-family:var(--mono);font-size:12px;border:1px solid var(--line);padding:4px 10px;color:var(--muted)}
footer:not(.sitefoot){border-top:1px solid var(--line);padding-block:28px 40px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:14px;font-family:var(--mono);font-size:13px;color:var(--muted)}
footer:not(.sitefoot) a{color:var(--muted)}

@media (max-width:860px){
  .topics{grid-template-columns:repeat(2,minmax(0,1fr))}
  .labgrid,.free,.about{grid-template-columns:minmax(0,1fr)}
  .lesson{grid-template-columns:minmax(0,1fr)}
  .lesson > div{border-right:0;border-bottom:1px solid var(--line)}
  .lesson > div:last-child{border-bottom:0}
  .about .photo-ph{max-width:200px}
}
@media (max-width:440px){.topics{grid-template-columns:minmax(0,1fr)}}
@media (prefers-reduced-motion:no-preference){
  .led.blink{animation:blink 1.3s steps(1) infinite}
  .led.blink.b2{animation-duration:.8s}
  .led.blink.b3{animation-duration:2.1s}
  @keyframes blink{50%{opacity:.25}}
}

@media(max-width:640px){
.table-scroll{overflow:visible}
table.sib{min-width:0;display:block}
.sib thead{display:none}.sib tbody{display:block}
.sib tr{display:grid;grid-template-columns:auto minmax(0,1fr);gap:2px 12px;padding:12px 14px;border-bottom:1px solid var(--line)}
.sib tr:last-child{border-bottom:0}
.sib td{display:block;padding:0;border:0}
.sib td.pt{grid-row:1/3}
.sib td.nm{grid-column:2}
.sib td:nth-child(n+3){grid-column:2;font-size:12px;color:var(--muted)}
}

/* ---- brand home page ---- */
.hero2{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:40px;align-items:center;padding-block:56px 48px}
.hero2 h1{font-family:var(--sans);font-weight:700;font-size:clamp(34px,5.4vw,58px);line-height:1.05;letter-spacing:-.03em;margin:0 0 16px;max-width:14ch;text-wrap:balance}
.hero2 h1 em{font-style:normal;color:var(--accent)}.hero2 .lead{font-size:18px;max-width:52ch;margin:0 0 26px}.hero2 .cta-row{margin-bottom:0}
.cta-row .btn{border-radius:12px;padding:14px 22px}
.term{background:#0a1522;border:1px solid var(--line);border-radius:16px;padding:0 0 16px;overflow:hidden;color:#E8F1F2;box-shadow:0 18px 50px rgba(0,0,0,.25)}
.term-bar{display:flex;align-items:center;gap:7px;padding:12px 14px;border-bottom:1px solid #1d3248;font:12px var(--mono);color:#93A8B8}.term-bar i{width:11px;height:11px;border-radius:50%;background:#35506b}
.term-bar i:nth-child(1){background:#FF6B5E}.term-bar i:nth-child(2){background:#FFB547}.term-bar i:nth-child(3){background:#2DD4BF}.term-bar span{margin-left:8px}
.term pre{margin:0;padding:18px 18px 12px;font:13px/1.8 var(--mono);white-space:pre-wrap;overflow-wrap:anywhere}.term .p{color:#2DD4BF;font-weight:700}.term .o{color:#93A8B8}
.term .cur{display:inline-block;width:10px;height:3px;background:#FFB547;vertical-align:-2px;animation:blink 1.1s steps(2) infinite}@keyframes blink{50%{opacity:0}}
.term .strips{margin:4px 18px 0}
.tracks{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-top:20px}
.trkcard{background:var(--surface);border:1px solid var(--line);border-top:4px solid var(--c);border-radius:16px;padding:22px;color:var(--c)}
.trkcard svg{width:56px;height:56px;display:block;margin-bottom:10px}.trkcard h3{color:var(--fg);margin:0 0 6px;font-size:20px}.trkcard p{color:var(--muted);margin:0;font-size:15px}
#courses .grid{margin-top:18px}
@media(max-width:820px){.hero2{grid-template-columns:1fr;padding-block:32px}}
@media(prefers-reduced-motion:reduce){.term .cur{animation:none}}

a.trkcard{display:block;text-decoration:none;transition:transform .15s,border-color .15s}a.trkcard:hover,a.trkcard:focus-visible{transform:translateY(-3px);border-color:var(--c)}

.about{grid-template-columns:240px minmax(0,1fr)}.about-photo{width:100%;height:auto;aspect-ratio:4/5;object-fit:cover;object-position:50% 20%;border-radius:16px;border:1px solid var(--line);display:block;background:#fff}
@media(max-width:700px){.about-photo{max-width:220px}}

/* ---- charm: landing ---- */
.hero2{position:relative}.hero2>*{position:relative}
.hero2::before{inset:-40px 0 auto 0;height:420px}
.hero2 h1 em{background:linear-gradient(90deg,var(--net),var(--prog));-webkit-background-clip:text;background-clip:text;color:transparent}
@media(prefers-color-scheme:light){:root:not([data-theme="dark"]) .hero2 h1 em{background:linear-gradient(90deg,#0F766E,#6558d9);-webkit-background-clip:text;background-clip:text}}
:root[data-theme="light"] .hero2 h1 em{background:linear-gradient(90deg,#0F766E,#6558d9);-webkit-background-clip:text;background-clip:text}
.term{transform:rotate(-.6deg);transition:transform .3s}.term:hover{transform:none}
.term pre{min-height:9.5em}
.landing section{border-top:0;position:relative}
.landing section::before{content:"";position:absolute;left:0;right:0;top:0;height:1px;background:linear-gradient(90deg,transparent,var(--line) 15%,var(--line) 85%,transparent)}
.landing section:not(:first-child)::after{content:"";position:absolute;left:50%;top:-4px;width:9px;height:9px;margin-left:-4px;border-radius:50%;background:var(--amber);box-shadow:0 0 0 4px var(--bg)}
.landing .label::before{content:"";width:18px;height:2px;background:var(--amber);margin-right:10px;border-radius:2px}
.trkcard{position:relative;overflow:hidden;background:linear-gradient(180deg,color-mix(in srgb,var(--c) 9%,var(--surface)),var(--surface) 55%)}
.trkcard svg{padding:10px;border-radius:14px;background:color-mix(in srgb,var(--c) 14%,transparent);width:64px;height:64px;color:var(--tcc,var(--c))}
.trkcard{color:var(--tcc,var(--c))}
a.trkcard:hover{box-shadow:var(--shadow)}
a.trkcard::after{content:"Browse \2192";display:block;margin-top:14px;font:600 13px var(--mono);color:var(--tcc,var(--c))}
.lesson>div{position:relative}
.lesson>div:nth-child(1) h3{color:var(--net)}.lesson>div:nth-child(2) h3{color:var(--prog)}.lesson>div:nth-child(3) h3{color:var(--sec)}.lesson>div:nth-child(4) h3{color:var(--amber,#FFB547)}
.lesson>div::before{content:"";position:absolute;left:0;top:0;right:0;height:3px}
.lesson>div:nth-child(1)::before{background:var(--net)}.lesson>div:nth-child(2)::before{background:var(--prog)}.lesson>div:nth-child(3)::before{background:var(--sec)}.lesson>div:nth-child(4)::before{background:var(--amber,#FFB547)}
.lesson{border-radius:14px;overflow:hidden}
/* about / instructor card */
.about-i{grid-template-columns:260px minmax(0,1fr);gap:36px;align-items:center}
.ring3{padding:5px;border:0!important;border-radius:50%!important;aspect-ratio:1/1!important;width:240px!important;height:240px!important;object-fit:cover;object-position:50% 20%;background:conic-gradient(var(--net) 0 33%,var(--prog) 0 66%,var(--sec) 0)!important;box-shadow:0 0 40px var(--glow-a)}
.ph-blank{display:grid;place-items:center}.ph-blank .empty-cur{background:var(--surface);border-radius:50%;width:100%;height:100%;justify-content:center;align-items:center}
.meet{position:relative;padding:24px 26px;border-top:3px solid var(--accent)}.meet p{max-width:64ch}.meet-n{font-size:26px;margin:0 0 2px}.meet-h{color:var(--muted);margin:0 0 12px!important}
.creds{list-style:none;margin:14px 0 6px;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.cred a,.cred span{display:inline-flex;align-items:center;gap:8px;font:500 13px var(--mono);padding:6px 12px;border-radius:999px;border:1px solid var(--line);background:color-mix(in srgb,var(--accent) 7%,transparent);color:var(--fg);text-decoration:none}
.cred a:hover{border-color:var(--accent)}.cred i{font-style:normal;display:grid;place-items:center;width:18px;height:18px;border-radius:50%;background:var(--accent);color:var(--accent-ink);font-size:11px}.cred small{color:var(--muted);font-size:12px}
.meet-links{display:flex;flex-wrap:wrap;gap:10px 16px;align-items:center;margin-top:14px!important}.meet-links a:not(.btn){font:500 14px var(--mono)}.meet-links .btn{padding:8px 16px;font-size:13px}
.facts span{border-radius:999px;color:var(--fg)}
@media(max-width:860px){.about-i{grid-template-columns:1fr;justify-items:center}.ring3{width:200px!important;height:200px!important}.meet{width:100%}}
@media(prefers-reduced-motion:reduce){.term{transform:none}}

@media(min-width:641px) and (max-width:900px){.lesson{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson>div:nth-child(2){border-right:0}.lesson>div:nth-child(-n+2){border-bottom:1px solid var(--line)}}

/* credential pill: title on line 1, issuer and year on line 2 */
.cred a,.cred span{border-radius:12px;align-items:flex-start;padding:8px 14px}.cred small{display:block;margin-top:2px}.cred a,.cred span{line-height:1.35}
.cred .ct{font-style:normal;display:block}

/* compact instructor strip */
.meetstrip{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:24px;align-items:center;padding:20px 24px;border:1px solid var(--line);border-top:3px solid var(--accent);background:var(--surface);border-radius:14px}
.ms-photo{width:104px;height:104px;border-radius:50%;object-fit:cover;object-position:50% 20%;display:block}.ms-n{font-size:26px;margin:0 0 4px}.ms-h{color:var(--muted);margin:0;max-width:60ch}.meetstrip .label{margin:0 0 4px}
@media(max-width:700px){.meetstrip{grid-template-columns:1fr;justify-items:center;text-align:center}.ms-b{justify-self:stretch;text-align:center}}

.chipbar{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px}
.fchip{font:600 13px var(--mono);background:transparent;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:7px 15px;cursor:pointer}
.fchip:hover{color:var(--fg);border-color:var(--c,var(--accent))}
.fchip.on{color:var(--fg);border-color:var(--c,var(--accent));background:color-mix(in srgb,var(--c,var(--accent)) 14%,transparent)}
#cgrid .card[hidden]{display:none}
.launch{margin-top:22px;padding:16px 18px;border:1px dashed var(--line);border-radius:14px}
.launch .label{margin:0 0 6px}
.launch .lrow{margin:4px 0}
.launch .rel{font-family:var(--mono);font-size:13px;color:var(--muted);margin-left:6px}
.values{margin-top:18px;font:500 13px var(--mono);color:var(--muted)}
.ms-b{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
@media(max-width:640px){.ms-b{justify-content:center}}

/* a little more air between the home page sections */
.landing section{padding-block:60px}
.landing section#courses{padding-top:56px}