:root {
  --ink: #e7f6f2;
  --muted: #9eb4af;
  --line: rgba(94, 232, 202, 0.22);
  --paper: #071114;
  --card: rgba(12, 28, 32, 0.78);
  --accent: #5ee8ca;
  --accent-2: #ffb15a;
  --accent-dark: #04241f;
  --blue: #8eb6ff;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: clip;
  color: var(--ink);
  background:
    radial-gradient(ellipse 70% 45% at 85% -10%, rgba(94, 232, 202, 0.16), transparent 55%),
    radial-gradient(ellipse 40% 35% at 0% 12%, rgba(255, 177, 90, 0.1), transparent 50%),
    var(--paper);
  font: 18px/1.55 "Iowan Old Style", Palatino, "Palatino Linotype", Georgia, serif;
  min-height: 100vh;
}
a { color: var(--accent); }
a:hover { color: #fff; }
.wrap { width: min(860px, calc(100% - 40px)); margin: 0 auto; }
header.hero { padding: 28px 0 8px; position: relative; }
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 16px;
  margin-bottom: 36px;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--accent); }
.brand { color: var(--accent) !important; letter-spacing: 0.16em; }
.pulse {
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 rgba(94, 232, 202, 0.7);
  animation: pulse 2.2s ease-out infinite;
  vertical-align: 1px;
}
h1 {
  margin: 0 0 14px;
  font-size: clamp(46px, 8vw, 76px);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 0.98;
  background: linear-gradient(100deg, #fff 10%, var(--accent) 55%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede { margin: 0; max-width: 36em; color: var(--muted); font-size: 21px; }
.scope {
  position: relative;
  margin: 28px 0 8px;
  height: 120px;
  border-radius: 16px;
  overflow: hidden;
  background:
    linear-gradient(rgba(94, 232, 202, 0.08) 1px, transparent 1px) 0 0 / 100% 24px,
    linear-gradient(90deg, rgba(94, 232, 202, 0.08) 1px, transparent 1px) 0 0 / 40px 100%,
    rgba(4, 16, 18, 0.85);
  border: 1px solid var(--line);
  box-shadow: inset 0 0 40px rgba(94, 232, 202, 0.06), 0 0 30px rgba(94, 232, 202, 0.08);
}
.scope svg { display: block; width: 100%; max-width: 100%; height: 100%; }
.trace {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2.2;
  stroke-linejoin: round;
  filter: drop-shadow(0 0 6px rgba(94, 232, 202, 0.85));
}
.trace.ghost {
  stroke: var(--accent-2);
  stroke-width: 1.4;
  opacity: 0.7;
  filter: drop-shadow(0 0 4px rgba(255, 177, 90, 0.6));
}
.scan {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 90px;
  background: linear-gradient(90deg, transparent, rgba(94, 232, 202, 0.28), transparent);
  animation: sweep 3.8s linear infinite;
  pointer-events: none;
}
main { padding: 18px 0 72px; }
article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px 28px 24px;
  margin: 0 0 16px;
  backdrop-filter: blur(8px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
article:hover {
  transform: translateY(-3px);
  border-color: rgba(94, 232, 202, 0.55);
  box-shadow: 0 0 0 1px rgba(94, 232, 202, 0.2), 0 22px 50px rgba(0, 0, 0, 0.4);
}
h2 {
  margin: 0 0 8px;
  font-size: 30px;
  font-weight: 500;
  letter-spacing: -0.02em;
}
h3 {
  margin: 26px 0 8px;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
}
p { margin: 0 0 14px; }
p:last-child { margin-bottom: 0; }
.when {
  margin: 0 0 8px;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-2);
}
ul { margin: 0 0 14px; padding-left: 1.15em; }
li { margin: 0 0 6px; }
li::marker { color: var(--accent); }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 18px; }
.button {
  display: inline-block;
  padding: 11px 18px;
  border-radius: 999px;
  background: linear-gradient(180deg, #7cf3da, var(--accent));
  color: var(--accent-dark);
  text-decoration: none;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: 15px;
  font-weight: 700;
  box-shadow: 0 0 18px rgba(94, 232, 202, 0.35);
}
.button:hover { color: var(--accent-dark); filter: brightness(1.08); }
.button.quiet {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--line);
  box-shadow: none;
}
.button.quiet:hover { color: #fff; border-color: var(--accent); background: transparent; filter: none; }
:not(pre) > code, p code, li code {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
  color: var(--accent);
}
pre {
  margin: 16px 0 0;
  padding: 16px 18px;
  overflow: auto;
  border-radius: 12px;
  background: #041014;
  border: 1px solid rgba(94, 232, 202, 0.16);
  color: #d7fff4;
  font: 14px/1.55 ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  box-shadow: inset 0 0 24px rgba(94, 232, 202, 0.05);
}
.id { color: #d7fff4; }
.op { color: var(--accent); }
.num { color: var(--accent-2); }
.fn { color: var(--blue); }
.note { color: var(--muted); font-size: 17px; }
.quantum {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 22px;
  align-items: center;
}
.ring {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 50%, transparent 42%, rgba(7, 17, 20, 1) 44%),
    conic-gradient(from 20deg, var(--accent), var(--accent-2), #8eb6ff, var(--accent));
  box-shadow: 0 0 24px rgba(94, 232, 202, 0.35);
  animation: spin 10s linear infinite;
}
footer {
  padding: 4px 0 40px;
  color: var(--muted);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
@keyframes sweep { from { left: -90px; } to { left: 100%; } }
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(94, 232, 202, 0.65); }
  100% { box-shadow: 0 0 0 12px rgba(94, 232, 202, 0); }
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (max-width: 640px) {
  .quantum { grid-template-columns: 1fr; }
  .ring { width: 64px; height: 64px; }
  h1 { font-size: 44px; }
  nav { flex-direction: column; align-items: flex-start; letter-spacing: 0.06em; }
  .brand { letter-spacing: 0.08em; }
}
@media (prefers-reduced-motion: reduce) {
  .scan, .pulse, .ring, article { animation: none; transition: none; }
  article:hover { transform: none; }
}