:root {
  /* Design system — deep navy + red CTA + glass (inspired by community-site retrospective) */
  --bg: #07111f;
  --bg-elev: rgba(18, 32, 56, 0.55);
  --bg-solid: #0c1a2e;
  --line: rgba(120, 160, 220, 0.18);
  --text: #e8eefc;
  --muted: #9aacc8;
  --accent: #3b82f6;
  --accent-soft: #60a5fa;
  --cta: #e11d48;
  --cta-hover: #fb7185;
  --glass: blur(14px) saturate(1.2);
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --sans: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
  --max: 960px;
  --radius: 14px;
  color-scheme: dark;
}
html[data-theme="light"] {
  --bg: #f4f7fc;
  --bg-elev: rgba(255, 255, 255, 0.72);
  --bg-solid: #ffffff;
  --line: rgba(30, 60, 110, 0.14);
  --text: #0f1b2d;
  --muted: #5a6d88;
  --accent: #1d4ed8;
  --accent-soft: #2563eb;
  --cta: #be123c;
  --cta-hover: #e11d48;
  --shadow: 0 10px 36px rgba(15, 40, 80, 0.08);
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(59, 130, 246, 0.18), transparent 55%),
    radial-gradient(900px 420px at 90% 0%, rgba(225, 29, 72, 0.12), transparent 50%),
    var(--bg);
  line-height: 1.6;
  min-height: 100vh;
}
.noise {
  pointer-events: none;
  position: fixed; inset: 0;
  background-image: radial-gradient(rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 3px 3px;
  opacity: 0.4;
  z-index: 0;
}
html[data-theme="light"] .noise { opacity: 0.25; background-image: radial-gradient(rgba(0,0,0,0.04) 1px, transparent 1px); }
.top, main, footer { position: relative; z-index: 1; }
.top {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  max-width: var(--max); margin: 0 auto; padding: 1.1rem 1.25rem 0;
  flex-wrap: wrap;
}
.mark {
  font-family: var(--mono); font-weight: 700; letter-spacing: 0.04em;
  color: #fff; background: linear-gradient(135deg, var(--accent), #1e3a8a);
  text-decoration: none;
  width: 2.35rem; height: 2.35rem; display: grid; place-items: center;
  border-radius: 0.55rem; box-shadow: var(--shadow);
}
.nav-wrap { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
nav { display: flex; gap: 0.95rem; flex-wrap: wrap; }
nav a {
  color: var(--muted); text-decoration: none; font-size: 0.9rem;
  font-family: var(--mono);
}
nav a:hover { color: var(--accent-soft); }
.icon-btn {
  border: 1px solid var(--line);
  background: var(--bg-elev);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  color: var(--text);
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  cursor: pointer;
}
.icon-btn:hover { border-color: var(--accent); color: var(--accent-soft); }
main { max-width: var(--max); margin: 0 auto; padding: 1.75rem 1.25rem 4rem; }
.hero { padding: 2.2rem 0 1rem; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--mono); font-size: 0.78rem; color: var(--accent-soft);
  text-transform: lowercase; letter-spacing: 0.02em;
}
.dot {
  width: 0.45rem; height: 0.45rem; border-radius: 50%;
  background: var(--cta); box-shadow: 0 0 14px rgba(225, 29, 72, 0.7);
}
h1 {
  font-size: clamp(2.15rem, 5vw, 3.3rem);
  line-height: 1.08; margin: 0.55rem 0 0.75rem; letter-spacing: -0.025em;
}
.lede { font-size: 1.12rem; color: var(--muted); max-width: 42rem; margin: 0; }
.actions { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-top: 1.35rem; align-items: center; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 0.82rem; font-weight: 700;
  text-decoration: none; border-radius: 999px; padding: 0.62rem 1.05rem;
  border: 1px solid transparent;
}
.btn-cta {
  background: var(--cta); color: #fff;
  box-shadow: 0 8px 24px rgba(225, 29, 72, 0.28);
}
.btn-cta:hover { background: var(--cta-hover); }
.btn-ghost {
  background: var(--bg-elev);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  border-color: var(--line);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-soft); }
.chips { display: flex; flex-wrap: wrap; gap: 0.55rem; margin-top: 1rem; }
.chip {
  font-family: var(--mono); font-size: 0.76rem;
  border: 1px solid var(--line);
  background: var(--bg-elev);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  color: var(--text); text-decoration: none; padding: 0.42rem 0.7rem;
  border-radius: 999px;
}
.chip:hover { border-color: var(--accent); color: var(--accent-soft); }
.panel { margin-top: 2.6rem; }
.glass {
  background: var(--bg-elev);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.3rem;
  box-shadow: var(--shadow);
}
h2 { font-size: 1.28rem; margin: 0 0 0.95rem; }
.hash { color: var(--accent-soft); font-family: var(--mono); margin-right: 0.25rem; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.grid { display: grid; gap: 1rem; }
.grid.two { grid-template-columns: 1.25fr 1fr; }
.grid.three { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 800px) {
  .grid.two, .grid.three { grid-template-columns: 1fr; }
  .top { padding-top: 0.9rem; }
}
.card {
  background: var(--bg-elev);
  backdrop-filter: var(--glass);
  -webkit-backdrop-filter: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}
.card h3 { margin: 0 0 0.45rem; font-size: 0.98rem; color: var(--accent-soft); font-family: var(--mono); }
.card p { margin: 0; color: var(--muted); font-size: 0.94rem; }
.card a { color: var(--accent-soft); }
.term { padding: 0; overflow: hidden; }
.term-bar {
  display: flex; align-items: center; gap: 0.35rem;
  padding: 0.55rem 0.75rem; border-bottom: 1px solid var(--line);
  background: rgba(8, 16, 30, 0.55);
}
html[data-theme="light"] .term-bar { background: rgba(240, 245, 252, 0.9); }
.term-bar span { width: 0.55rem; height: 0.55rem; border-radius: 50%; background: #3a4452; }
.term-bar span:nth-child(1) { background: #ff5f57; }
.term-bar span:nth-child(2) { background: #febc2e; }
.term-bar span:nth-child(3) { background: #28c840; }
.term-bar code { margin-left: auto; color: var(--muted); font-size: 0.72rem; }
.term pre {
  margin: 0; padding: 0.9rem 1rem 1.1rem;
  font-family: var(--mono); font-size: 0.78rem; line-height: 1.45;
  color: var(--text); overflow-x: auto;
}
.pubs { list-style: none; padding: 0; margin: 0; }
.pubs li {
  display: grid; grid-template-columns: 4.2rem 1fr; gap: 0.75rem;
  padding: 1rem 0; border-bottom: 1px solid var(--line);
}
.pubs li:last-child { border-bottom: 0; padding-bottom: 0; }
.year { font-family: var(--mono); color: var(--cta); font-size: 0.9rem; padding-top: 0.15rem; }
.pubs a { color: var(--text); text-decoration: none; font-weight: 600; }
.pubs a:hover { color: var(--accent-soft); }
.meta { margin: 0.25rem 0 0; color: var(--muted); font-size: 0.88rem; }
.foot-note { margin-top: 1rem; color: var(--muted); font-size: 0.9rem; }
.foot-note a { color: var(--accent-soft); }
footer {
  max-width: var(--max); margin: 0 auto; padding: 0 1.25rem 2.5rem;
  color: var(--muted); font-family: var(--mono); font-size: 0.75rem;
}
footer a { color: var(--accent-soft); }
code { font-family: var(--mono); font-size: 0.9em; }