:root {
  --bg: #0b0f14;
  --panel: #121821;
  --ink: #e6edf5;
  --muted: #8b97a8;
  --line: #243040;
  --accent: #7dd3c7;
  --mono: "SF Mono", "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --sans: "Avenir Next", "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.65;
}

a {
  color: var(--accent);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  padding: 0.5rem 0.8rem;
  background: var(--accent);
  color: #0b0f14;
}

.skip-link:focus {
  top: 1rem;
}

.shell {
  display: grid;
  grid-template-columns: 15rem 1fr;
  min-height: 100vh;
}

.rail {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 2rem 1.4rem;
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.logo {
  color: var(--ink);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 1.4rem;
}

.nav-toggle {
  display: none;
}

.site-nav {
  display: grid;
  gap: 0.7rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-family: var(--mono);
  font-size: 0.92rem;
}

.site-nav a:hover {
  color: var(--accent);
}

.rail-note {
  margin-top: auto;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.75rem;
}

main {
  padding: 3.5rem 4rem 4rem;
}

.hero {
  padding-bottom: 3rem;
}

.eyebrow,
.idx,
.lang,
dt,
.status {
  font-family: var(--mono);
  color: var(--accent);
}

.eyebrow {
  letter-spacing: 0.08em;
}

h1,
h2,
h3 {
  margin: 0 0 0.7rem;
}

h1 {
  font-size: clamp(2.8rem, 7vw, 5.2rem);
  letter-spacing: -0.04em;
}

h2 {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 1.2rem;
}

.lede,
section p {
  max-width: 40rem;
  color: var(--muted);
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.4rem;
  color: var(--ink);
}

.status span {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: #3dd68c;
}

section {
  padding: 2.2rem 0;
  border-top: 1px solid var(--line);
}

.meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.5rem 0 0;
}

.meta div {
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 1rem;
}

dt {
  font-size: 0.75rem;
}

dd {
  margin: 0.3rem 0 0;
}

.row {
  display: grid;
  grid-template-columns: 4rem 1fr 5rem;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.lang {
  text-align: right;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

@media (max-width: 860px) {
  .shell,
  .meta,
  .row,
  footer {
    display: grid;
    grid-template-columns: 1fr;
  }

  .rail {
    position: sticky;
    height: auto;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
    background: var(--panel);
    color: var(--ink);
    border: 1px solid var(--line);
    padding: 0.4rem 0.7rem;
    font: inherit;
  }

  .site-nav {
    display: none;
    width: 100%;
  }

  .site-nav.is-open {
    display: grid;
  }

  .rail-note {
    display: none;
  }

  main {
    padding: 2rem 1.2rem 3rem;
  }
}