:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --ink: #1c2333;
  --ink-soft: #5b6478;
  --line: #e2e5ea;
  --accent: #2f5bd7;
  --accent-soft: #eef2fd;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --wrap: 68rem;
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.65 var(--sans);
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 1.25rem;
}

a { color: var(--accent); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; }

h1, h2, h3 { line-height: 1.25; margin: 0 0 .6rem; font-weight: 650; letter-spacing: -.015em; }
h1 { font-size: clamp(1.75rem, 3.4vw, 2.5rem); }
h2 { font-size: 1.375rem; margin-top: 2.5rem; }
h3 { font-size: 1.0625rem; margin-top: 1.75rem; }
p { margin: 0 0 1rem; }

code {
  font: 500 .875em/1.5 var(--mono);
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: .1em .35em;
}

pre {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  margin: 0 0 1.25rem;
}
pre code { background: none; border: 0; padding: 0; font-size: .8125rem; }

/* ---------- skip link ---------- */

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: .6rem 1rem;
  z-index: 20;
  border-radius: 0 0 6px 0;
}
.skip:focus { left: 0; }

/* ---------- header ---------- */

.site-head {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(140%) blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-head .wrap {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  min-height: 4rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  color: var(--ink);
  font-weight: 650;
  letter-spacing: -.02em;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand .mark {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font: 700 .8125rem/1 var(--mono);
  letter-spacing: -.5px;
}

.nav-toggle {
  margin-left: auto;
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: .45rem .7rem;
  font: inherit;
  font-size: .875rem;
  color: var(--ink);
  cursor: pointer;
}

.nav {
  margin-left: auto;
  display: flex;
  gap: 1.5rem;
  font-size: .9375rem;
}
.nav a { color: var(--ink-soft); position: relative; }
.nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -4px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .22s ease;
}
.nav a:hover::after, .nav a:focus-visible::after, .nav a[aria-current="page"]::after { transform: scaleX(1); }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 550; }

/* ---------- layout ---------- */

main { padding: 3rem 0 4rem; }
.lede { font-size: 1.125rem; color: var(--ink-soft); max-width: 46rem; }
.prose { max-width: 44rem; }
.prose ul, .prose ol { margin: 0 0 1.25rem; padding-left: 1.35rem; }
.prose li { margin-bottom: .4rem; }

.hero { padding-bottom: 1rem; border-bottom: 1px solid var(--line); margin-bottom: 2.5rem; }
@media (prefers-reduced-motion: no-preference) {
  .hero { animation: heroIn .55s ease-out both; }
  .hero .eyebrow { animation: heroIn .55s .08s ease-out both; }
  .hero h1 { animation: heroIn .55s .14s ease-out both; }
  .hero .lede { animation: heroIn .55s .22s ease-out both; }
  .hero .btn-row { animation: heroIn .55s .30s ease-out both; }
  .grid > * { opacity: 0; transform: translateY(14px); }
  .grid.in-view > * { animation: cardIn .5s ease-out forwards; }
  .grid.in-view > *:nth-child(2) { animation-delay: .07s; }
  .grid.in-view > *:nth-child(3) { animation-delay: .14s; }
  .grid.in-view > *:nth-child(4) { animation-delay: .21s; }
  .grid.in-view > *:nth-child(5) { animation-delay: .28s; }
  .grid.in-view > *:nth-child(6) { animation-delay: .35s; }
}
@keyframes heroIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@keyframes cardIn { to { opacity: 1; transform: none; } }

.eyebrow {
  font: 600 .75rem/1 var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: .9rem;
}

.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
}

.card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.35rem;
  background: var(--bg);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 24px rgba(28, 35, 51, .08); border-color: rgba(47, 91, 215, .22); }
@media (prefers-reduced-motion: reduce) { .card:hover { transform: none; box-shadow: none; } }
.card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
.card p { color: var(--ink-soft); font-size: .9375rem; }

.panel {
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.5rem;
}

.btn-row { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 1.75rem; }
.btn {
  display: inline-block;
  padding: .6rem 1.1rem;
  border-radius: 7px;
  font-size: .9375rem;
  font-weight: 550;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
}
.btn:hover { text-decoration: none; opacity: .92; }
.btn.ghost { background: none; color: var(--accent); }

dl.meta { display: grid; grid-template-columns: max-content 1fr; gap: .4rem 1.25rem; margin: 0; font-size: .9375rem; }
dl.meta dt { color: var(--ink-soft); }
dl.meta dd { margin: 0; }

/* ---------- notes list ---------- */

.note-list { list-style: none; margin: 0; padding: 0; }
.note-list li { padding: 1.35rem 0; border-bottom: 1px solid var(--line); }
.note-list li:first-child { padding-top: 0; }
.note-list h3 { margin: 0 0 .35rem; }
.note-list p { margin: 0; color: var(--ink-soft); font-size: .9375rem; }
.note-list time { font: 500 .8125rem/1 var(--mono); color: var(--ink-soft); display: block; margin-bottom: .5rem; }

.note-head { margin-bottom: 2.25rem; padding-bottom: 1.25rem; border-bottom: 1px solid var(--line); }
.note-head time { font: 500 .8125rem/1 var(--mono); color: var(--ink-soft); }

.tag-row { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .9rem; }
.tag {
  font: 500 .75rem/1 var(--mono);
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 999px;
  padding: .35rem .65rem;
}

/* ---------- footer ---------- */

.site-foot {
  border-top: 1px solid var(--line);
  padding: 2rem 0 3rem;
  font-size: .875rem;
  color: var(--ink-soft);
}
.site-foot .wrap { display: flex; flex-wrap: wrap; gap: 1rem 2rem; align-items: baseline; }
.site-foot nav { display: flex; gap: 1.25rem; margin-left: auto; }
.site-foot a { color: var(--ink-soft); }

/* ---------- utility ---------- */

.center { text-align: center; }
.mt0 { margin-top: 0; }
.muted { color: var(--ink-soft); }

@media (max-width: 44rem) {
  .nav-toggle { display: block; }
  .nav {
    display: none;
    position: absolute;
    top: 4rem;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: .5rem 1.25rem 1rem;
  }
  .nav.open { display: flex; }
  .nav a { padding: .6rem 0; }
  .site-foot nav { margin-left: 0; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151c;
    --bg-alt: #1a1f29;
    --ink: #e7eaf0;
    --ink-soft: #99a2b4;
    --line: #262c38;
    --accent: #7d9cf5;
    --accent-soft: #1c2437;
  }
  .site-head { background: rgba(18, 21, 28, .92); }
  .btn { color: #12151c; }
}