:root{
  --bg:#07090c; --bg2:#0d1117; --card:#111821; --fg:#e8ecf1; --muted:#8e99a8; --line:#202935;
  --accent:#5eead4; --accent2:#818cf8; --accent-ink:#04201c;
}
:root[data-theme="light"]{
  --bg:#fafaf8; --bg2:#f0f0ec; --card:#ffffff; --fg:#13171c; --muted:#586270; --line:#dcdcd4;
  --accent:#0f766e; --accent2:#4f46e5; --accent-ink:#ffffff;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{background:var(--bg);color:var(--fg);font-family:Inter,system-ui,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit}
button{font:inherit;color:inherit;cursor:pointer}
.mono{font-family:"JetBrains Mono",ui-monospace,monospace}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
section{padding:104px 0;position:relative}
section.alt{background:var(--bg2)}
h1,h2,h3,h4{line-height:1.15;letter-spacing:-.02em}
h2{font-size:clamp(1.9rem,4vw,3rem);margin-bottom:18px;max-width:22ch}
h3{font-size:1.1rem}
.label{color:var(--accent);font-size:.78rem;margin-bottom:14px;text-transform:uppercase;letter-spacing:.1em}
.sub{color:var(--muted);max-width:68ch;margin-bottom:36px}
.sub-h{font-size:1.5rem;margin:72px 0 10px}
.accent{color:var(--accent)}
.grad{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}

/* progress + glow */
.progress{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--accent),var(--accent2));z-index:50}
.glow{position:fixed;width:520px;height:520px;border-radius:50%;pointer-events:none;z-index:0;left:0;top:0;transform:translate(-50%,-50%);background:radial-gradient(circle,color-mix(in srgb,var(--accent2) 14%,transparent),transparent 65%);opacity:0;transition:opacity .4s}
main,footer{position:relative;z-index:1}

/* nav */
.nav{position:fixed;inset:0 0 auto 0;z-index:40;display:flex;justify-content:space-between;align-items:center;padding:14px 28px;background:color-mix(in srgb,var(--bg) 78%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:border-color .2s}
.nav.scrolled{border-color:var(--line)}
.logo{font-weight:700;text-decoration:none;font-size:1.1rem;font-family:"JetBrains Mono",monospace}
.logo span{color:var(--accent)}
.nav nav{display:flex;gap:22px;align-items:center;font-size:.88rem}
.nav nav a{text-decoration:none;color:var(--muted);transition:color .2s}
.nav nav a:hover,.nav nav a.active{color:var(--fg)}
.btn-small{border:1px solid var(--accent);color:var(--accent)!important;padding:6px 14px;border-radius:999px}
.nav-tools{display:flex;gap:8px}
.icon-btn{background:none;border:1px solid var(--line);border-radius:10px;width:36px;height:36px;font-size:1rem}
.icon-btn:hover{border-color:var(--accent)}
.burger{display:none}

/* hero */
.hero{padding:130px 0 0;min-height:100svh;display:flex;flex-direction:column;justify-content:space-between;overflow:hidden}
#bg{position:absolute;inset:0;width:100%;height:100%;z-index:0;opacity:.7}
.hero::before{content:"";position:absolute;inset:0;z-index:0;background:
  radial-gradient(55% 45% at 85% 8%,color-mix(in srgb,var(--accent2) 22%,transparent),transparent),
  radial-gradient(45% 45% at 5% 95%,color-mix(in srgb,var(--accent) 16%,transparent),transparent)}
.hero .wrap{position:relative;z-index:1;width:100%}
.skip{position:absolute;left:-999px;top:8px;background:var(--accent);color:var(--accent-ink);padding:8px 14px;border-radius:8px;z-index:100}
.skip:focus{left:8px}
.hero-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:48px;align-items:center}
.eyebrow{color:var(--muted);font-size:.82rem;margin-bottom:18px;display:flex;align-items:center;gap:10px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 0 var(--accent);animation:ping 2s infinite}
@keyframes ping{70%{box-shadow:0 0 0 10px transparent}100%{box-shadow:0 0 0 0 transparent}}
.hero h1{font-size:clamp(3.4rem,10vw,7rem);font-weight:800;letter-spacing:-.04em;line-height:.95}
.role{font-size:clamp(1.15rem,2.6vw,1.7rem);margin:20px 0 14px;font-weight:600;min-height:2.4em}
.caret{color:var(--accent);animation:blink 1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.lead{color:var(--muted);max-width:56ch;font-size:1.04rem}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin:30px 0}
.btn{display:inline-block;padding:12px 22px;border-radius:999px;background:var(--accent);color:var(--accent-ink);font-weight:600;text-decoration:none;border:1px solid var(--accent);transition:transform .15s,box-shadow .2s}
.btn:hover{transform:translateY(-2px);box-shadow:0 8px 24px color-mix(in srgb,var(--accent) 35%,transparent)}
.btn.ghost{background:transparent;color:var(--fg);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--accent);box-shadow:none}

.term{background:color-mix(in srgb,var(--card) 92%,transparent);border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:0 30px 80px -30px rgba(0,0,0,.6)}
.term-bar{display:flex;align-items:center;gap:6px;padding:10px 14px;border-bottom:1px solid var(--line);font-size:.75rem;color:var(--muted)}
.term-bar i{width:10px;height:10px;border-radius:50%;background:#ff5f57}.term-bar i:nth-child(2){background:#febc2e}.term-bar i:nth-child(3){background:#28c840;margin-right:8px}
.term pre{padding:18px;font-size:.78rem;line-height:1.75;min-height:290px;white-space:pre-wrap;color:var(--fg)}
.term .c{color:var(--accent)}.term .m{color:var(--muted)}.term .y{color:var(--accent2)}

.stats{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:20px;margin:56px auto 40px;padding-top:28px;border-top:1px solid var(--line)}
.stats b{display:block;font-size:2.1rem;color:var(--accent);letter-spacing:-.02em}
.stats span{color:var(--muted);font-size:.84rem}

.marquee{position:relative;z-index:1;border-block:1px solid var(--line);overflow:hidden;background:color-mix(in srgb,var(--bg) 70%,transparent)}
.track{display:flex;gap:44px;width:max-content;padding:16px 0;animation:slide 40s linear infinite}
.track span{font-family:"JetBrains Mono",monospace;font-size:.85rem;color:var(--muted);white-space:nowrap}
.track span::before{content:"◆";color:var(--accent);margin-right:44px;font-size:.6rem}
@keyframes slide{to{transform:translateX(-50%)}}

/* layout helpers */
.grid2{display:grid;grid-template-columns:1fr 1.2fr;gap:56px;margin-bottom:56px}
.prose p{color:var(--muted);margin-bottom:16px}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:18px}
.cards.two{grid-template-columns:repeat(auto-fit,minmax(340px,1fr))}
.cards.four{grid-template-columns:repeat(auto-fit,minmax(230px,1fr))}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px;transition:border-color .25s,transform .25s}
.card:hover{border-color:var(--accent);transform:translateY(-4px)}
.card h3{margin-bottom:8px}
.card p{color:var(--muted);font-size:.94rem}
.ico{width:42px;height:42px;display:grid;place-items:center;border-radius:12px;background:color-mix(in srgb,var(--accent) 14%,transparent);color:var(--accent);margin-bottom:16px;font-size:1.2rem}
.tag{font-size:.7rem;color:var(--accent2);text-transform:uppercase;letter-spacing:.1em;font-weight:600}
.stack{margin-top:14px;font-size:.76rem;color:var(--accent)!important}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.chips i{font-style:normal;font-size:.78rem;padding:4px 11px;border:1px solid var(--line);border-radius:999px;color:var(--muted)}
.chips i.hl{border-color:var(--accent);color:var(--accent)}

/* services */
.services{display:grid;grid-template-columns:repeat(auto-fit,minmax(460px,1fr));gap:0;border:1px solid var(--line);border-radius:18px;overflow:hidden;margin-top:36px}
.svc{padding:34px;background:var(--card);border:1px solid var(--line);margin:-.5px;position:relative;transition:background .25s}
.svc:hover{background:color-mix(in srgb,var(--accent) 6%,var(--card))}
.svc .num{color:var(--accent);font-size:.8rem}
.svc h3{font-size:1.4rem;margin:8px 0 12px}
.svc p{color:var(--muted)}

/* diagram */
.diagram{background:var(--card);border:1px solid var(--line);border-radius:18px;padding:22px;margin-bottom:28px;overflow-x:auto}
.diagram svg{width:100%;min-width:700px;height:auto;color:var(--accent)}
.diagram text{fill:var(--fg);font:500 13px Inter,sans-serif;text-anchor:middle}
.diagram text.s{fill:var(--muted);font-size:11px}
.diagram text.t{font-weight:700;font-size:14px}
.diagram text.lft{text-anchor:start}
.diagram .node rect{fill:var(--bg2);stroke:var(--line);stroke-width:1.5}
.diagram .node.edge rect{stroke:var(--accent2)}
.diagram .host{fill:none;stroke:var(--accent);stroke-dasharray:6 5}
.diagram .line path{stroke:var(--accent);stroke-width:2;fill:none}
.diagram .pulse{fill:var(--accent)}

/* lab tabs */
.lab{display:grid;grid-template-columns:260px 1fr;gap:0;background:var(--card);border:1px solid var(--line);border-radius:18px;overflow:hidden}
.lab-tabs{list-style:none;border-right:1px solid var(--line)}
.lab-tabs button{display:flex;gap:12px;align-items:center;width:100%;text-align:left;background:none;border:0;border-bottom:1px solid var(--line);padding:16px 18px;color:var(--muted);transition:background .2s,color .2s}
.lab-tabs li:last-child button{border-bottom:0}
.lab-tabs button span{font-family:"JetBrains Mono",monospace;font-size:.72rem;color:var(--accent)}
.lab-tabs button:hover{color:var(--fg)}
.lab-tabs button[aria-selected="true"]{background:color-mix(in srgb,var(--accent) 10%,transparent);color:var(--fg);box-shadow:inset 3px 0 0 var(--accent)}
.lab-panel{padding:32px}
.lab-panel h3{font-size:1.5rem;margin-bottom:6px}
.lab-panel .what{color:var(--accent);font-size:.82rem;margin-bottom:14px}
.lab-panel p{color:var(--muted);margin-bottom:16px}
.lab-panel ul{margin-left:18px;color:var(--muted)}
.lab-panel li{margin-bottom:8px}
.lab-panel pre{margin-top:18px;background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:14px;font-size:.76rem;overflow-x:auto;color:var(--accent)}
.policy ul{margin:14px 0 0 18px;color:var(--muted);font-size:.9rem}
.policy .tag{display:block;margin-bottom:6px}

/* steps */
.steps{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px;margin-top:20px;counter-reset:s}
.steps li{display:flex;gap:14px;padding:22px;background:var(--card);border:1px solid var(--line);border-radius:16px}
.steps b{flex:none;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:var(--accent);color:var(--accent-ink);font-size:.9rem}
.steps h4{margin-bottom:4px;font-size:1rem}
.steps p{color:var(--muted);font-size:.88rem}

/* timeline */
.timeline{list-style:none;margin-top:40px;position:relative}
.timeline::before{content:"";position:absolute;left:218px;top:0;bottom:0;width:2px;background:var(--line)}
.timeline>li{display:grid;grid-template-columns:200px 1fr;gap:48px;padding:30px 0;position:relative}
.timeline>li::before{content:"";position:absolute;left:213px;top:38px;width:12px;height:12px;border-radius:50%;background:var(--bg2);border:2px solid var(--accent)}
.when{color:var(--accent);font-size:.8rem;text-align:right}
.when small{display:block;color:var(--muted);margin-top:4px}
.now{display:inline-block;margin-top:8px;font-style:normal;font-size:.68rem;padding:2px 9px;border-radius:999px;background:var(--accent);color:var(--accent-ink);text-transform:uppercase;letter-spacing:.08em}
.what{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px;transition:border-color .25s}
.what:hover{border-color:var(--accent)}
.what h3{font-size:1.25rem}
.what h3 span{color:var(--muted);font-weight:500}
.blurb{color:var(--muted);font-size:.9rem;margin:6px 0 4px}
.what ul{margin:12px 0 0 18px;color:var(--muted)}
.what li{margin-bottom:8px;padding-left:4px}
.what b{color:var(--fg)}

/* projects */
.filters{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0 28px}
.filters button{background:none;border:1px solid var(--line);border-radius:999px;padding:7px 16px;font-size:.84rem;color:var(--muted)}
.filters button.on,.filters button:hover{border-color:var(--accent);color:var(--accent)}
.proj{display:flex;flex-direction:column}
.proj h3{font-size:1.35rem;margin:6px 0 10px}
.proj .more{display:grid;grid-template-rows:0fr;transition:grid-template-rows .35s}
.proj.open .more{grid-template-rows:1fr}
.proj .more>div{overflow:hidden}
.proj dl{margin-top:16px;display:grid;gap:10px}
.proj dt{font-family:"JetBrains Mono",monospace;font-size:.7rem;color:var(--accent);text-transform:uppercase;letter-spacing:.08em}
.proj dd{color:var(--muted);font-size:.9rem}
.proj .toggle{margin-top:auto;align-self:flex-start;background:none;border:0;color:var(--accent);padding:16px 0 0;font-size:.88rem}
.proj a.ext{color:var(--accent);font-size:.88rem;margin-top:12px;display:inline-block}
.proj.hide{display:none}

/* skills */
.skills{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:18px;margin-top:36px}
.skill-box{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px}

/* contact */
.center{text-align:center}
.center h2,.center .sub{margin-left:auto;margin-right:auto}
.big{font-size:clamp(2.4rem,7vw,5rem);max-width:none}
.center .cta{justify-content:center}
footer{border-top:1px solid var(--line);padding:26px 0;color:var(--muted);font-size:.84rem}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

@media(max-width:900px){
  .hero-grid,.grid2,.lab{grid-template-columns:1fr}
  .lab-tabs{border-right:0;border-bottom:1px solid var(--line);display:flex;overflow-x:auto}
  .lab-tabs button{border-bottom:0;white-space:nowrap}
  .lab-tabs button[aria-selected="true"]{box-shadow:inset 0 -3px 0 var(--accent)}
  .services{grid-template-columns:1fr}
  .timeline::before,.timeline>li::before{display:none}
  .timeline>li{grid-template-columns:1fr;gap:10px}
  .when{text-align:left}
}
@media(max-width:760px){
  section{padding:68px 0}
  .burger{display:block}
  .nav nav{position:fixed;inset:60px 0 auto 0;flex-direction:column;align-items:flex-start;gap:0;background:var(--bg);border-bottom:1px solid var(--line);padding:8px 28px 20px;transform:translateY(-130%);transition:transform .3s}
  .nav nav.open{transform:none}
  .nav nav a{padding:12px 0;width:100%}
  .cards.two{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}