:root {
  --ink: #101313;
  --panel: #1b2020;
  --paper: #eef0e8;
  --muted: #666e6a;
  --acid: #d8ff3e;
  --orange: #bd4525;
  --line: rgba(16, 19, 19, 0.16);
  font-family: Inter, "Avenir Next", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    linear-gradient(rgba(16, 19, 19, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 19, 19, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 50px 50px;
}
::selection { color: var(--ink); background: var(--acid); }
a { color: inherit; text-underline-offset: .25em; }
button, input { font: inherit; }
:focus-visible { outline: 3px solid var(--paper); outline-offset: 3px; box-shadow: 0 0 0 6px var(--ink); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link {
  position: fixed;
  z-index: 100;
  top: .75rem;
  left: .75rem;
  min-height: 2.75rem;
  padding: .8rem 1rem;
  color: var(--paper);
  background: var(--ink);
  font-size: .78rem;
  font-weight: 850;
  letter-spacing: .08em;
  text-decoration: none;
  text-transform: uppercase;
  transform: translateY(calc(-100% - 1.5rem));
  transition: transform 160ms ease;
}
.skip-link:focus-visible {
  outline-color: var(--acid);
  box-shadow: 0 0 0 6px var(--ink);
  transform: translateY(0);
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 78px;
  padding: 0 4vw;
  border-bottom: 1px solid var(--line);
  background: rgba(238, 240, 232, .88);
  backdrop-filter: blur(18px);
}
.brand { display: inline-flex; align-items: center; gap: .7rem; width: fit-content; font-weight: 900; letter-spacing: .12em; text-decoration: none; }
.brand img { display: block; }
.header nav { display: flex; gap: clamp(1rem, 3vw, 2.5rem); }
.header nav a, .github-link { display: inline-flex; align-items: center; min-height: 2.75rem; font-size: .73rem; font-weight: 850; letter-spacing: .1em; text-decoration: none; text-transform: uppercase; }
.github-link { justify-self: end; }

.hero, .section, footer { width: min(1240px, calc(100% - 8vw)); margin-inline: auto; }
.hero { display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(3rem, 7vw, 8rem); align-items: center; min-height: calc(100svh - 78px); padding: 6rem 0; }
.kicker { margin: 0 0 1.2rem; color: var(--muted); font-family: ui-monospace, Consolas, monospace; font-size: .72rem; font-weight: 800; letter-spacing: .12em; }
h1, h2, h3 { margin: 0; line-height: .94; letter-spacing: -.055em; text-wrap: balance; }
h1 { max-width: 10ch; font-size: clamp(4rem, 8vw, 8rem); }
h1 em { color: var(--orange); font-family: Georgia, serif; font-weight: 400; }
.lead { max-width: 39rem; margin: 2rem 0 0; color: var(--muted); font-size: clamp(1rem, 1.4vw, 1.22rem); line-height: 1.6; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 1.2rem; align-items: center; margin-top: 2.2rem; }
.hero-actions > a { font-size: .76rem; font-weight: 850; letter-spacing: .07em; text-transform: uppercase; }
.primary-action { display: inline-flex; gap: 1.5rem; align-items: center; padding: 1rem 1.3rem; color: var(--paper); background: var(--ink); border-radius: 999px; text-decoration: none; }
.primary-action span { color: var(--acid); font-size: 1.1rem; }

.packet-art {
  position: relative;
  aspect-ratio: 1 / 1.05;
  min-width: 0;
  overflow: hidden;
  border: 1px solid rgba(238,240,232,.12);
  border-radius: 2rem;
  background: var(--ink);
  box-shadow: 0 30px 70px rgba(16,19,19,.22);
  isolation: isolate;
}
.packet-art::before {
  position: absolute;
  inset: 12%;
  border: 1px solid rgba(238,240,232,.1);
  border-radius: 1.35rem;
  content: "";
}
.packet-grid {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(rgba(238,240,232,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(238,240,232,.045) 1px, transparent 1px);
  background-position: -1px -1px;
  background-size: 3.25rem 3.25rem;
}
.packet-meta {
  position: absolute;
  top: 6%;
  right: 7%;
  left: 7%;
  display: flex;
  justify-content: space-between;
  color: rgba(238,240,232,.52);
  font-family: ui-monospace, Consolas, monospace;
  font-size: clamp(.55rem, 1.2vw, .68rem);
  font-weight: 700;
  letter-spacing: .12em;
}
.packet-meta span:last-child { color: var(--acid); }
.packet-routes {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  fill: var(--acid);
  stroke: rgba(216,255,62,.48);
  stroke-linecap: round;
  stroke-width: .34;
  vector-effect: non-scaling-stroke;
}
.packet-node,
.packet-core {
  position: absolute;
  z-index: 2;
  display: grid;
  align-content: center;
  min-width: 0;
  min-height: 15%;
  padding: clamp(.65rem, 2vw, 1rem);
  border: 1px solid rgba(238,240,232,.17);
  border-radius: 1rem;
  color: var(--paper);
  background: rgba(27,32,32,.96);
  box-shadow: 0 12px 28px rgba(0,0,0,.22);
  text-align: center;
}
.packet-node span,
.packet-core span {
  color: rgba(238,240,232,.48);
  font-family: ui-monospace, Consolas, monospace;
  font-size: clamp(.48rem, 1vw, .6rem);
  font-weight: 750;
  letter-spacing: .13em;
}
.packet-node strong,
.packet-core strong {
  min-width: 0;
  margin-top: .35rem;
  overflow-wrap: anywhere;
  font-family: ui-monospace, Consolas, monospace;
  font-size: clamp(.7rem, 1.45vw, .94rem);
  line-height: 1.15;
}
.packet-node small {
  margin-top: .22rem;
  color: var(--acid);
  font-family: ui-monospace, Consolas, monospace;
  font-size: clamp(.45rem, .9vw, .55rem);
  letter-spacing: .08em;
}
.packet-node-top,
.packet-node-bottom { left: 34%; width: 32%; }
.packet-node-top { top: 17%; }
.packet-node-bottom { bottom: 17%; }
.packet-node-left,
.packet-node-right { top: 50%; width: 27%; transform: translateY(-50%); }
.packet-node-left { left: 6%; }
.packet-node-right { right: 6%; }
.packet-core {
  top: 40%;
  left: 36%;
  width: 28%;
  min-height: 20%;
  border-color: rgba(216,255,62,.65);
  background: var(--acid);
  box-shadow: 0 0 0 .45rem rgba(216,255,62,.07), 0 16px 30px rgba(0,0,0,.25);
  color: var(--ink);
}
.packet-core span { color: rgba(16,19,19,.56); }
.packet-core strong {
  font-size: clamp(.82rem, 1.8vw, 1.18rem);
  letter-spacing: -.02em;
}
.packet-caption {
  position: absolute;
  right: 7%;
  bottom: 5.5%;
  left: 7%;
  margin: 0;
  color: rgba(238,240,232,.46);
  font-family: ui-monospace, Consolas, monospace;
  font-size: clamp(.5rem, 1vw, .62rem);
  letter-spacing: .12em;
  text-align: center;
}

.section { padding: clamp(5rem, 9vw, 9rem) 0; border-top: 1px solid var(--line); }
.section-intro { display: grid; grid-template-columns: 1fr minmax(20rem,.55fr); gap: 1rem 4rem; align-items: end; margin-bottom: 3rem; }
.section-intro .kicker { grid-column: 1/-1; }
.section-intro h2, .history h2 { font-size: clamp(3.2rem, 6.6vw, 6.4rem); }
.section-intro > p:last-child { margin: 0; color: var(--muted); line-height: 1.65; }

.browser-shell { overflow: hidden; border: 1px solid rgba(238,240,232,.12); border-radius: 1.35rem; color: var(--paper); background: var(--ink); box-shadow: 0 30px 70px rgba(16,19,19,.2); }
.browser-bar { display: grid; grid-template-columns: auto minmax(0,1fr) auto; gap: 1rem; align-items: center; min-height: 4.5rem; padding: .8rem 1.3rem; border-bottom: 1px solid rgba(238,240,232,.13); }
.status-dot { width: .7rem; height: .7rem; border-radius: 50%; background: var(--acid); box-shadow: 0 0 0 .3rem rgba(216,255,62,.1); }
.browser-bar form { display: grid; grid-template-columns: minmax(0,1fr) auto; overflow: hidden; border: 1px solid rgba(238,240,232,.18); border-radius: .65rem; background: var(--panel); }
.browser-bar input { min-width: 0; padding: .72rem .9rem; border: 0; outline: 0; color: var(--paper); background: transparent; font-family: monospace; }
.browser-bar form:focus-within { border-color: var(--acid); }
.browser-bar button { min-height: 2.75rem; padding: 0 1rem; border: 0; color: var(--ink); background: var(--acid); cursor: pointer; font-size: .7rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.mode { color: var(--acid); font-family: monospace; font-size: .67rem; letter-spacing: .09em; text-transform: uppercase; }
.browser-grid { display: grid; grid-template-columns: 1.35fr .65fr; min-height: 39rem; }
.menu-pane { min-width: 0; border-right: 1px solid rgba(238,240,232,.13); }
.pane-heading { display: flex; justify-content: space-between; gap: 1rem; padding: 1.5rem; color: rgba(238,240,232,.5); font-family: monospace; font-size: .66rem; letter-spacing: .1em; }
.pane-heading p { margin: 0; }
.menu-list { padding: 0 1rem 1rem; }
.menu-item { display: grid; grid-template-columns: 3.2rem minmax(0,1fr) auto; gap: 1rem; align-items: center; width: 100%; padding: 1rem; border: 0; border-top: 1px solid rgba(238,240,232,.1); color: var(--paper); background: transparent; cursor: pointer; text-align: left; }
.menu-item:hover, .menu-item[aria-current="true"] { color: var(--ink); background: var(--acid); }
.menu-item > span:first-child { font-family: monospace; font-size: .7rem; font-weight: 900; letter-spacing: .08em; }
.menu-item > span:nth-child(2) { display: flex; min-width: 0; flex-direction: column; }
.menu-item strong { overflow: hidden; font-size: .98rem; text-overflow: ellipsis; white-space: nowrap; }
.menu-item small { color: rgba(238,240,232,.5); font-family: monospace; font-size: .67rem; }
.menu-item:hover small, .menu-item[aria-current="true"] small { color: rgba(16,19,19,.6); }
.menu-item i { font-style: normal; }
.trace-pane { padding: 2rem; background: var(--panel); }
.trace-kicker { margin: 0; color: var(--acid); font-family: monospace; font-size: .68rem; letter-spacing: .12em; }
.trace-type { margin: 3rem 0 1rem; font-size: clamp(5rem, 9vw, 8rem); font-weight: 900; letter-spacing: -.08em; line-height: .8; }
.trace-pane h3 { font-size: clamp(2rem,3vw,3rem); }
.trace-pane dl { margin: 2rem 0; }
.trace-pane dl div { display: grid; grid-template-columns: 5rem minmax(0,1fr); gap: 1rem; padding: .75rem 0; border-bottom: 1px solid rgba(238,240,232,.1); }
.trace-pane dt { color: rgba(238,240,232,.5); font-size: .68rem; text-transform: uppercase; }
.trace-pane dd { min-width: 0; margin: 0; overflow-wrap: anywhere; font-family: monospace; font-size: .75rem; }
.raw-line { margin-top: 2rem; padding: 1rem; border: 1px solid rgba(216,255,62,.3); background: rgba(216,255,62,.04); }
.raw-line span { display: block; margin-bottom: .55rem; color: var(--acid); font-family: monospace; font-size: .62rem; letter-spacing: .1em; }
.raw-line code { display: block; overflow-wrap: anywhere; color: rgba(238,240,232,.68); font-size: .7rem; line-height: 1.6; }
.fixture-note { margin: 1rem 0 0; color: var(--muted); font-size: .75rem; }
.fixture-note span { color: var(--orange); }

.section-intro.compact { grid-template-columns: 1fr; }
.anatomy { display: grid; grid-template-columns: .5fr 1.2fr 1.2fr 1fr .5fr; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.anatomy div { min-width: 0; min-height: 20rem; padding: 1.35rem; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.anatomy div:nth-child(odd) { background: rgba(216,255,62,.12); }
.anatomy span { display: block; min-height: 8rem; overflow-wrap: anywhere; color: var(--orange); font-family: monospace; font-size: clamp(1.2rem,2.2vw,2.3rem); }
.anatomy b { font-family: monospace; font-size: .7rem; letter-spacing: .1em; }
.anatomy p { color: var(--muted); font-size: .82rem; line-height: 1.5; }

.history { display: grid; grid-template-columns: 1.1fr .9fr; gap: 4rem; align-items: end; }
.history .kicker { grid-column: 1/-1; }
.history-copy { padding: 2rem; color: var(--paper); background: var(--ink); box-shadow: 1.2rem 1.2rem 0 var(--acid); }
.history-copy p { margin: 0; line-height: 1.65; }
.history-copy p + p { margin-top: 1.2rem; color: rgba(238,240,232,.58); font-size: .82rem; }

footer { display: grid; grid-template-columns: 1fr auto 1fr; gap: 1rem; align-items: center; padding: 2rem 0 3rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .76rem; }
footer img { max-width: 100%; height: auto; }
footer p { margin: 0; }
footer a { justify-self: end; color: var(--ink); font-weight: 800; }

@media (max-width: 920px) {
  .header { grid-template-columns: 1fr auto; }
  .header nav { display: none; }
  .hero { grid-template-columns: 1fr; }
  .packet-art { width: min(100%, 36rem); justify-self: center; }
  .section-intro, .history { grid-template-columns: 1fr; }
  .browser-grid { grid-template-columns: 1fr; }
  .menu-pane { border-right: 0; border-bottom: 1px solid rgba(238,240,232,.13); }
  .anatomy { grid-template-columns: repeat(2,1fr); }
  .anatomy div:last-child { grid-column: 1/-1; }
}

@media (max-width: 600px) {
  .header { min-height: 68px; padding: 0 1.1rem; }
  .header img { width: 36px; height: 36px; }
  .hero, .section, footer { width: calc(100% - 2.2rem); }
  .hero { min-height: auto; padding: 4rem 0; }
  h1 { max-width: none; font-size: clamp(3.1rem,14.6vw,4rem); }
  .packet-art { width: 100%; }
  .packet-art::before { inset: 10%; }
  .packet-node, .packet-core { border-radius: .75rem; }
  .packet-node-left, .packet-node-right { padding-inline: .45rem; }
  .section-intro h2, .history h2 { font-size: clamp(2.8rem,14vw,4.1rem); }
  .browser-bar { grid-template-columns: auto minmax(0,1fr); padding: .8rem; }
  .mode { grid-column: 2; }
  .browser-bar form { grid-column: 2; grid-row: 1; }
  .browser-bar input { font-size: .72rem; }
  .browser-bar button { padding-inline: .7rem; }
  .pane-heading { padding: 1rem; }
  .menu-list { padding-inline: .5rem; }
  .menu-item { grid-template-columns: 2.5rem minmax(0,1fr) auto; gap: .6rem; padding: .9rem .6rem; }
  .trace-pane { padding: 1.4rem; }
  .anatomy { grid-template-columns: 1fr; }
  .anatomy div:last-child { grid-column: auto; }
  .anatomy div { min-height: 13rem; }
  .anatomy span { min-height: 4rem; }
  .history-copy { box-shadow: .7rem .7rem 0 var(--acid); }
  footer { grid-template-columns: 1fr auto; }
  footer p { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .skip-link { transition: none; }
}