:root {
  --bg: #ffffff;
  --bg-alt: #f6f8f8;
  --ink: #11201f;
  --ink-soft: #4a5c5b;
  --rule: #dde5e4;
  --accent: #0f766e;
  --accent-soft: #e6f2f1;
  --max: 60rem;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c1413;
    --bg-alt: #121d1c;
    --ink: #eaf2f1;
    --ink-soft: #9fb3b1;
    --rule: #243634;
    --accent: #5eead4;
    --accent-soft: #14312e;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.65 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.5rem; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }
.skip {
  position: absolute; left: -9999px;
}
.skip:focus {
  left: 1rem; top: .6rem; position: fixed; z-index: 10;
  background: var(--bg); color: var(--ink);
  padding: .5rem .8rem; border: 1px solid var(--rule); border-radius: 6px;
}

header { border-bottom: 1px solid var(--rule); padding: 1.1rem 0; }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; flex-wrap: wrap; }
.brand {
  display: flex; align-items: center; gap: .65rem;
  font-weight: 650; letter-spacing: -.01em; font-size: 1.05rem;
  color: inherit; text-decoration: none;
}
.mark {
  width: 26px; height: 26px; border-radius: 6px;
  background: var(--accent);
  display: grid; place-items: center;
  color: #fff; font-size: .8rem; font-weight: 700; flex: none;
}
@media (prefers-color-scheme: dark) { .mark { color: #0c1413; } }
nav { display: flex; gap: 1.25rem; font-size: .94rem; }
nav a { color: var(--ink-soft); text-decoration: none; }
nav a:hover, nav a[aria-current="page"] { color: var(--ink); text-decoration: underline; }

.hero { padding: 4.5rem 0 3.5rem; }
.hero.short { padding: 3rem 0 2.25rem; }
h1 {
  font-size: clamp(2rem, 6vw, 3.1rem);
  line-height: 1.08; letter-spacing: -.025em; font-weight: 680;
  margin: 0 0 1.1rem; max-width: 30ch;
}
h1.sm { font-size: clamp(1.7rem, 4.5vw, 2.3rem); }
.lede {
  font-size: clamp(1.05rem, 2.4vw, 1.22rem);
  color: var(--ink-soft); max-width: 62ch; margin: 0;
}

section { padding: 3rem 0; border-top: 1px solid var(--rule); }
h2 {
  font-size: .8rem; text-transform: uppercase; letter-spacing: .09em;
  color: var(--ink-soft); font-weight: 650; margin: 0 0 1.6rem;
}
h3 { font-size: 1.05rem; margin: 0 0 .45rem; letter-spacing: -.01em; font-weight: 640; }
p { margin: 0 0 1rem; max-width: 70ch; }
p:last-child { margin-bottom: 0; }
.prose p { color: var(--ink-soft); }
.prose h3 { margin-top: 2rem; }
.prose h3:first-child { margin-top: 0; }

.more { margin-top: 1.75rem; }
.grid { display: grid; gap: 1.5rem; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }
.card {
  background: var(--bg-alt); border: 1px solid var(--rule);
  border-radius: 10px; padding: 1.4rem 1.4rem 1.5rem;
}
.card p { color: var(--ink-soft); font-size: .96rem; margin: 0; }

ul.posture { list-style: none; margin: 0; padding: 0; display: grid; gap: .85rem; max-width: 70ch; }
ul.posture li { padding-left: 1.6rem; position: relative; color: var(--ink-soft); }
ul.posture li::before {
  content: ""; position: absolute; left: 0; top: .55em;
  width: .5rem; height: .5rem; border-radius: 50%; background: var(--accent);
}
ul.posture b { color: var(--ink); font-weight: 620; }

.note {
  background: var(--accent-soft); border: 1px solid var(--rule);
  border-radius: 10px; padding: 1.2rem 1.4rem; max-width: 70ch; font-size: .96rem;
}

footer {
  border-top: 1px solid var(--rule); padding: 2rem 0 3rem;
  color: var(--ink-soft); font-size: .88rem;
}
footer p { margin: 0 0 .4rem; }
footer nav { margin-top: .9rem; }