:root {
  --bg: #F4F4F7;
  --surface: #FFFFFF;
  --raised: #E9E9EF;
  --line: #D9D9E1;
  --text: #111117;
  --body: #36363F;
  --muted: #585864;
  --green: #16A34A;
  --green-ink: #06210F;
  --blue: #2563EB;
  --amber: #D97706;
  --red: #DC2626;
  --cyan: #0891B2;
  --grey: #6B7280;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0D0D12;
    --surface: #16161E;
    --raised: #20202A;
    --line: #2A2A35;
    --text: #F5F5F7;
    --body: #C9C9D3;
    --muted: #A1A1AD;
    --green: #22C55E;
    --blue: #60A5FA;
    --amber: #F59E0B;
    --red: #EF4444;
    --cyan: #22D3EE;
    --grey: #9CA3AF;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--body);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--green); text-decoration-thickness: 1px; text-underline-offset: 3px; }
h1, h2, h3 { color: var(--text); line-height: 1.15; letter-spacing: -0.02em; }
h1 { font-size: clamp(40px, 8vw, 64px); margin: 0 0 12px; font-weight: 800; }
h2 { font-size: 26px; margin: 48px 0 12px; }
h3 { font-size: 18px; margin: 28px 0 6px; }
p, li { max-width: 68ch; }

.wrap { max-width: 980px; margin: 0 auto; padding: 0 20px; }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 22px 0; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 800; font-size: 20px; letter-spacing: -0.02em; }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.brand .dot, .wordmark .dot { color: var(--green); }
.nav-links { display: flex; gap: 18px; font-size: 15px; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover { color: var(--text); }

.hero { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: center; padding: 40px 0 24px; }
.hero .lede { font-size: 21px; color: var(--muted); margin: 0 0 28px; }
.wordmark { font-weight: 800; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.button { display: inline-block; background: var(--green); color: var(--green-ink); font-weight: 700; text-decoration: none; padding: 14px 22px; border-radius: 999px; }
.button.secondary { background: var(--raised); color: var(--text); }
.note { font-size: 14px; color: var(--muted); }

/* A little stack of cards, like the app */
.stack { position: relative; height: 360px; max-width: 320px; margin: 0 auto; width: 100%; }
.card { position: absolute; left: 0; right: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 22px; padding: 20px 22px; box-shadow: 0 18px 40px rgba(0,0,0,0.12); }
.card .from { color: var(--text); font-weight: 700; }
.card .subject { color: var(--body); font-size: 15px; margin-top: 4px; }
.card .bar { height: 6px; border-radius: 3px; margin-bottom: 14px; width: 54px; }
.card.c3 { top: 0; transform: scale(0.88); opacity: 0.55; }
.card.c2 { top: 26px; transform: scale(0.94); opacity: 0.8; }
.card.c1 { top: 56px; transform: rotate(-4deg); }
.card .lines span { display: block; height: 9px; border-radius: 5px; background: var(--raised); margin-top: 10px; }
.card .lines span:nth-child(2) { width: 82%; }
.card .lines span:nth-child(3) { width: 64%; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; margin-top: 20px; }
.tile { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; padding: 18px; }
.tile b { display: block; color: var(--text); margin-bottom: 4px; }
.tile p { margin: 0; font-size: 15px; color: var(--muted); }
.chip { display: inline-block; width: 12px; height: 12px; border-radius: 50%; margin-right: 8px; vertical-align: -1px; }

.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 22px; padding: 24px; margin-top: 20px; }

.doc { max-width: 760px; padding-bottom: 40px; }
.doc h1 { font-size: clamp(34px, 6vw, 46px); margin-top: 24px; }
.doc .meta { color: var(--muted); margin-top: 0; }
.doc ul { padding-left: 22px; }
.doc li { margin: 6px 0; }
.callout { background: var(--surface); border: 1px solid var(--line); border-left: 4px solid var(--green); border-radius: 14px; padding: 16px 18px; margin: 20px 0; }

footer { border-top: 1px solid var(--line); margin-top: 64px; padding: 26px 0 40px; font-size: 14px; color: var(--muted); }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
footer a { color: var(--muted); margin-right: 16px; }

@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; padding-top: 16px; }
  .stack { height: 300px; }
  .nav-links { gap: 14px; }
}
.card.c2 .from, .card.c2 .subject, .card.c3 .from, .card.c3 .subject { visibility: hidden; }