:root {
  --bg: #f6f4ee;
  --surface: #ffffff;
  --ink: #15140f;
  --muted: #6a675e;
  --line: #e1ddd2;
  --accent: #2448d8;
  --accent-soft: color-mix(in srgb, var(--accent) 12%, transparent);
  --warn: #d2541f;
  --ok: #1f8a5a;
  --serif: "Instrument Serif", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --ease: cubic-bezier(.2, .8, .2, 1);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f0f0d;
    --surface: #181814;
    --ink: #eeebe2;
    --muted: #9a968a;
    --line: #2a2924;
    --accent: #8ea6ff;
    --warn: #ff8a57;
    --ok: #4fd497;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f0f0d;
  --surface: #181814;
  --ink: #eeebe2;
  --muted: #9a968a;
  --line: #2a2924;
  --accent: #8ea6ff;
  --warn: #ff8a57;
  --ok: #4fd497;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background .4s, color .4s;
}
a { color: inherit; }
b { font-weight: 600; color: var(--ink); }
.mono { font-family: var(--mono); }
::selection { background: var(--accent); color: var(--bg); }

/* Ambient layers */
.progress {
  position: fixed; inset: 0 0 auto; height: 2px; z-index: 50;
  background: var(--accent);
  transform-origin: 0 50%;
  transform: scaleX(var(--p, 0));
}
.spotlight {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(600px circle at var(--mx, 70%) var(--my, 20%), var(--accent-soft), transparent 60%),
    radial-gradient(circle, color-mix(in srgb, var(--ink) 9%, transparent) 1px, transparent 1.5px) 0 0 / 28px 28px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0, #000 70vh, transparent 110vh);
  mask-image: linear-gradient(to bottom, #000 0, #000 70vh, transparent 110vh);
}

.nav, main, .footer {
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: clamp(16px, 5vw, 48px);
}

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: 16px;
  padding-block: 16px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px) saturate(1.2);
  -webkit-backdrop-filter: blur(12px) saturate(1.2);
}
.mark { font: 30px/1 var(--serif); text-decoration: none; margin-right: auto; }
.mark span { color: var(--accent); }
.nav nav { position: relative; display: flex; gap: 4px; }
.nav nav a {
  position: relative; z-index: 1;
  padding: 7px 14px; border-radius: 999px;
  text-decoration: none; color: var(--muted); font-size: 14px;
  transition: color .25s;
}
.nav nav a:hover, .nav nav a.active { color: var(--ink); }
.nav-pill {
  position: absolute; top: 0; left: 0; height: 100%;
  border-radius: 999px; background: var(--surface); border: 1px solid var(--line);
  opacity: 0;
  transition: transform .45s var(--ease), width .45s var(--ease), opacity .3s;
}
.theme {
  display: grid; place-items: center;
  width: 36px; height: 36px; padding: 0;
  border: 1px solid var(--line); border-radius: 50%;
  background: none; color: var(--ink); cursor: pointer;
  transition: transform .5s var(--ease), border-color .2s;
}
.theme:hover { border-color: var(--ink); transform: rotate(180deg); }

/* Hero */
.hero {
  display: grid; grid-template-columns: 1.15fr .85fr; gap: clamp(32px, 5vw, 64px);
  align-items: center;
  padding-block: clamp(56px, 12vh, 120px) clamp(48px, 8vh, 80px);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px;
  margin: 0 0 20px; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted);
}
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ok); box-shadow: 0 0 0 0 var(--ok); animation: ping 2.4s infinite; }
@keyframes ping { 0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--ok) 60%, transparent); } 80%, 100% { box-shadow: 0 0 0 10px transparent; } }

h1 {
  margin: 0;
  font: 400 clamp(60px, 10vw, 132px)/.92 var(--serif);
  letter-spacing: -.025em;
}
.split .ch { display: inline-block; opacity: 0; transform: translateY(.5em) rotate(4deg); filter: blur(6px);
  animation: rise .9s var(--ease) forwards; animation-delay: calc(var(--i) * 35ms + .1s); }
.split .sp { display: inline-block; width: .25em; }
.split.wait .ch { animation-play-state: paused; }
@keyframes rise { to { opacity: 1; transform: none; filter: none; } }

.lede {
  max-width: 36ch; margin: 28px 0 0;
  font-size: clamp(19px, 2vw, 22px); line-height: 1.5; color: var(--muted);
}
.rotator { display: inline-grid; vertical-align: bottom; overflow: hidden; color: var(--ink); font-style: italic; font-family: var(--serif); font-size: 1.18em; line-height: 1.2; }
.rotator span { display: inline-block; white-space: nowrap; }
.rotator span.out { animation: out .45s var(--ease) forwards; }
.rotator span.in { animation: in .55s var(--ease) forwards; }
@keyframes out { to { transform: translateY(-110%); opacity: 0; } }
@keyframes in { from { transform: translateY(110%); opacity: 0; } to { transform: none; opacity: 1; } }

.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px;
  border: 1px solid var(--line); border-radius: 999px;
  background: var(--surface);
  text-decoration: none; font-weight: 500; font-size: 15px;
  transition: border-color .2s, background .25s, color .25s, transform .3s var(--ease);
}
.btn:hover { border-color: var(--ink); }
.btn.primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn.primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.arrow { transition: transform .3s var(--ease); }
.btn:hover .arrow { transform: translateX(4px); }

/* Hero trace diagram */
.trace {
  margin: 0; padding: 18px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 18px;
  box-shadow: 0 30px 60px -30px color-mix(in srgb, var(--ink) 25%, transparent);
}
.trace-head { display: flex; justify-content: space-between; gap: 12px; font-size: 12px; color: var(--muted); }
.status { display: inline-flex; align-items: center; gap: 6px; }
.status i { width: 7px; height: 7px; border-radius: 50%; background: var(--ok); transition: background .3s; }
.status b { font-weight: 500; color: var(--muted); }
.trace.down .status i { background: var(--warn); }
.trace-svg { display: block; width: 100%; height: auto; margin: 8px 0; overflow: visible; }
.wire { fill: none; stroke: var(--line); stroke-width: 2; }
.wire.alt { stroke-dasharray: 4 5; }
.trace.down .wire.alt { stroke: color-mix(in srgb, var(--warn) 55%, var(--line)); }
.node circle { fill: var(--bg); stroke: var(--line); stroke-width: 1.5; transition: stroke .3s, fill .3s; }
.node text { font: 500 10px var(--mono); fill: var(--ink); text-anchor: middle; dominant-baseline: central; }
.node.core circle { stroke: var(--accent); stroke-width: 2; }
.trace.down .node.auth circle { stroke: var(--warn); stroke-dasharray: 3 4; }
.trace.down .node.auth text { fill: var(--muted); }
.trace.down .node.stand circle { stroke: var(--warn); fill: color-mix(in srgb, var(--warn) 10%, var(--bg)); }
.packets circle { fill: var(--accent); }
.packets circle.alt { fill: var(--warn); }
.log {
  list-style: none; margin: 0; padding: 12px 0 0; border-top: 1px solid var(--line);
  height: 92px; overflow: hidden; font-size: 11.5px; color: var(--muted);
}
.log li { display: flex; gap: 10px; white-space: nowrap; animation: logIn .4s var(--ease); }
.log li .k { color: var(--ok); }
.log li.si .k { color: var(--warn); }
@keyframes logIn { from { opacity: 0; transform: translateY(-6px); } }

/* Stats */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.stat { padding: 28px 20px 28px 0; }
.stat + .stat { padding-left: 20px; border-left: 1px solid var(--line); }
.stat b { display: block; font: 400 clamp(40px, 5vw, 56px)/1 var(--serif); font-variant-numeric: tabular-nums; }
.stat span { display: block; margin-top: 8px; font-size: 14px; color: var(--muted); max-width: 22ch; }

/* Marquee */
.marquee {
  overflow: hidden; padding-block: 22px; border-bottom: 1px solid var(--line);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}
.marquee-track { display: flex; width: max-content; gap: 40px; animation: scroll 40s linear infinite; font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.marquee-track span::before { content: "◆"; margin-right: 40px; color: var(--accent); font-size: 8px; vertical-align: middle; }
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes scroll { to { transform: translateX(-50%); } }

/* Sections */
.section { padding-block: clamp(64px, 12vh, 120px); }
.section-head { margin-bottom: 48px; }
.kicker { margin: 0 0 12px; font-size: 12px; color: var(--accent); letter-spacing: .04em; }
.section-title { margin: 0; font: 400 clamp(36px, 5vw, 56px)/1.05 var(--serif); letter-spacing: -.01em; }

/* Timeline */
.timeline { position: relative; padding-left: 36px; }
.rail { position: absolute; left: 6px; top: 6px; bottom: 6px; width: 2px; background: var(--line); border-radius: 2px; }
.rail-fill { width: 100%; height: 100%; background: var(--accent); transform-origin: top; transform: scaleY(var(--rail, 0)); border-radius: 2px; }
.role {
  position: relative;
  display: grid; grid-template-columns: 240px 1fr; gap: 32px;
  padding: 32px 0;
  border-top: 1px solid var(--line);
  transition: opacity .4s, filter .4s;
}
.role:first-of-type { border-top: 0; padding-top: 0; }
.role::before {
  content: ""; position: absolute; left: -36px; top: 38px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--line);
  transition: border-color .4s, background .4s, transform .4s var(--ease);
}
.role:first-of-type::before { top: 6px; }
.role.lit::before { border-color: var(--accent); background: var(--accent); transform: scale(1.1); }
.role-meta { display: flex; flex-direction: column; gap: 6px; }
.when { font-size: 12px; color: var(--accent); }
.org { font-weight: 600; font-size: 18px; }
.via { font-size: 13px; color: var(--muted); }
.role h3 { margin: 0 0 10px; font: 400 32px/1.15 var(--serif); }
.role p { margin: 0; max-width: 62ch; color: var(--muted); }
.points { margin: 18px 0 0; padding: 0; list-style: none; display: grid; gap: 10px; max-width: 66ch; }
.points li { position: relative; padding-left: 22px; color: var(--muted); font-size: 15px; }
.points li::before { content: ""; position: absolute; left: 0; top: .72em; width: 10px; height: 1px; background: var(--accent); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 20px; }
.chips span { padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px; font-size: 11.5px; color: var(--muted); }

/* Highlights */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.card {
  position: relative; overflow: hidden;
  display: flex; flex-direction: column; gap: 10px;
  min-height: 260px; padding: 26px;
  background: var(--surface); border: 1px solid var(--line); border-radius: 18px;
  transform: perspective(900px) rotateX(var(--rx, 0)) rotateY(var(--ry, 0));
  transition: transform .5s var(--ease), border-color .3s, box-shadow .3s;
}
.card::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: 0;
  background: radial-gradient(320px circle at var(--cx, 50%) var(--cy, 50%), var(--accent-soft), transparent 60%);
  transition: opacity .3s;
}
.card:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); box-shadow: 0 24px 48px -28px color-mix(in srgb, var(--ink) 30%, transparent); }
.card:hover::after { opacity: 1; }
.num { width: 30px; height: 30px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 50%; font-size: 12px; color: var(--accent); }
.card h3 { margin: 12px 0 0; font: 400 26px/1.15 var(--serif); }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .meta { margin-top: auto; font-size: 11.5px; color: var(--muted); }

/* Stack filter */
.filter { display: flex; flex-wrap: wrap; gap: 8px; }
.filter button {
  padding: 9px 16px; border: 1px solid var(--line); border-radius: 999px;
  background: var(--surface); color: var(--ink); font: 500 14px var(--sans); cursor: pointer;
  transition: background .25s, color .25s, border-color .25s, transform .25s var(--ease);
}
.filter button:hover { border-color: var(--ink); transform: translateY(-2px); }
.filter button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
.filter-out { margin: 24px 0 12px; font-size: 13px; color: var(--muted); min-height: 1.6em; }
.filter-roles { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; min-height: 48px; }
.filter-roles li {
  display: flex; justify-content: space-between; gap: 16px; align-items: baseline;
  padding: 14px 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface);
  animation: logIn .45s var(--ease) both; animation-delay: calc(var(--i) * 60ms);
}
.filter-roles li span { font-size: 12px; color: var(--muted); font-family: var(--mono); white-space: nowrap; }

.edu {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 64px;
}
.edu > div { padding: 24px; border: 1px solid var(--line); border-radius: 18px; }
.edu h3 { margin: 0; font: 400 24px/1.2 var(--serif); }
.edu p:last-child { margin: 6px 0 0; color: var(--muted); font-size: 14px; }

/* Contact */
.contact { text-align: center; border-top: 1px solid var(--line); }
.contact h2 { margin: 0; font: 400 clamp(44px, 8vw, 96px)/1 var(--serif); letter-spacing: -.02em; }
.contact > p:not(.kicker) { color: var(--muted); margin: 20px auto 36px; max-width: 46ch; }
.links { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; }

.footer {
  display: flex; justify-content: space-between;
  padding-block: 28px 40px; border-top: 1px solid var(--line);
  font-size: 13px; color: var(--muted);
}
.footer a { text-decoration: none; }
.footer a:hover { color: var(--ink); }

/* Scroll reveal */
.js .reveal { opacity: 0; translate: 0 24px; transition: opacity .8s var(--ease), translate .8s var(--ease); transition-delay: var(--d, 0s); }
.js .reveal.in { opacity: 1; translate: none; }
.js .card.reveal {
  transition: opacity .8s var(--ease), translate .8s var(--ease), transform .5s var(--ease), border-color .3s, box-shadow .3s;
  transition-delay: var(--d, 0s), var(--d, 0s), 0s, 0s, 0s;
}

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat:nth-child(3) { padding-left: 0; border-left: 0; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--line); }
}
@media (max-width: 680px) {
  .nav { flex-wrap: wrap; padding-block: 10px; }
  .nav nav {
    order: 3;
    width: 100%;
    justify-content: space-between;
    gap: 0;
  }
  .nav nav a { min-height: 44px; padding: 8px 6px; font-size: 12px; }
  h1 { font-size: clamp(48px, 13vw, 60px); }
  .hero { gap: 32px; padding-block: 48px; }
  .section { padding-block: 56px; }
  .section-head { margin-bottom: 32px; }
  .role { grid-template-columns: 1fr; gap: 14px; }
  .timeline { padding-left: 28px; }
  .role::before { left: -28px; }
  .edu { grid-template-columns: 1fr; }
  .filter-roles li { flex-direction: column; gap: 2px; }
  .filter button { min-height: 44px; }
  .stat { padding-right: 12px; }
  .stat + .stat { padding-left: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001s !important; animation-iteration-count: 1 !important; transition-duration: .001s !important; }
  html { scroll-behavior: auto; }
  .marquee-track { animation: none; }
}