:root {
  color-scheme: light dark;
  --ink: #07171a;
  --ink-soft: #3f565b;
  --paper: #f3f7f6;
  --raised: #ffffff;
  --line: #cbd9d7;
  --accent: #3974db;
  --accent-dark: #2259ba;
  --wash: #e4ecfb;
  --warm: #a8492d;
  --shadow: 0 14px 40px -28px rgba(7, 23, 26, .45);
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #e9f4f4;
    --ink-soft: #aac0c3;
    --paper: #071215;
    --raised: #0d1d21;
    --line: #294147;
    --accent: #78a9ff;
    --accent-dark: #9bbfff;
    --wash: #122445;
    --warm: #ff9b7c;
    --shadow: 0 18px 48px -26px rgba(0, 0, 0, .9);
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 1rem/1.65 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent-dark); }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

.shell { width: min(100% - 2.5rem, 72rem); margin-inline: auto; }

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.5rem;
  border-bottom: 1px solid var(--line);
}

.brand { color: var(--ink); font-weight: 800; letter-spacing: -.035em; text-decoration: none; }
.brand b { color: var(--accent); }
.masthead nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: .45rem 1.1rem; }
.masthead nav a { color: var(--ink-soft); font-size: .9rem; font-weight: 650; text-decoration: none; }
.masthead nav a[aria-current="page"] { color: var(--ink); }

main { padding-block: clamp(2.5rem, 7vw, 6rem); }
.narrow { width: min(100%, 48rem); }

.eyebrow {
  margin: 0 0 .75rem;
  color: var(--accent-dark);
  font-size: .76rem;
  font-weight: 800;
  letter-spacing: .14em;
  text-transform: uppercase;
}

h1, h2, h3 { line-height: 1.18; letter-spacing: -.025em; text-wrap: balance; }
h1 { margin: 0; max-width: 18ch; font-size: clamp(2.35rem, 7vw, 4.8rem); }
h2 { margin: 3rem 0 .75rem; font-size: clamp(1.35rem, 3vw, 1.8rem); }
h3 { margin: 1.75rem 0 .4rem; font-size: 1.05rem; }
p { margin: .8rem 0; }
.lede { max-width: 52rem; margin: 1.2rem 0 0; color: var(--ink-soft); font-size: clamp(1.08rem, 2.5vw, 1.28rem); }
.stamp { color: var(--ink-soft); font-size: .9rem; }

.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2.25rem;
}

.card, .callout {
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--raised);
  box-shadow: var(--shadow);
}

.card { display: flex; flex-direction: column; padding: 1.25rem; color: var(--ink); text-decoration: none; }
.card:hover { border-color: var(--accent); }
.card strong { font-size: 1.08rem; }
.card span { margin-top: .45rem; color: var(--ink-soft); font-size: .93rem; }
.callout { margin: 1.5rem 0; padding: 1.15rem 1.25rem; }
.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }
.callout.accent { background: var(--wash); border-color: var(--accent); }

ul, ol { padding-left: 1.3rem; }
li { margin: .55rem 0; }
code { padding: .08rem .3rem; border-radius: .3rem; background: var(--wash); font-size: .9em; }

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: .75rem 1.5rem;
  border-top: 1px solid var(--line);
  padding-block: 1.5rem 3rem;
  color: var(--ink-soft);
  font-size: .82rem;
}
.footer p { margin: 0; }
.footer-links { display: flex; flex-wrap: wrap; gap: .5rem 1rem; }

.home main { padding: 0; }
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(14rem, .65fr);
  align-items: center;
  gap: clamp(2rem, 8vw, 7rem);
  min-height: min(48rem, calc(100svh - 4.5rem));
  padding-block: clamp(4rem, 10vw, 8rem);
}
.hero h1 { max-width: 14ch; }
.hero .lede { max-width: 48rem; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.4rem; margin-top: 2rem; }
.status {
  display: inline-flex;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--wash);
  padding: .48rem .8rem;
  color: var(--accent-dark);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.text-link { font-weight: 750; text-underline-offset: .2em; }
.app-mark { width: min(100%, 20rem); justify-self: end; filter: drop-shadow(0 2rem 2rem rgba(7, 23, 26, .2)); }
.app-mark img { display: block; width: 100%; height: auto; }

.feature-band { border-block: 1px solid var(--line); background: var(--raised); padding-block: clamp(4rem, 9vw, 7rem); }
.feature-band h2 { max-width: 18ch; }
.feature-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; margin-top: 2.5rem; background: var(--line); border: 1px solid var(--line); }
.feature-grid article { min-height: 16rem; padding: 1.5rem; background: var(--paper); }
.feature-grid article span { color: var(--accent-dark); font-size: .78rem; font-weight: 800; letter-spacing: .12em; }
.feature-grid h3 { margin-top: 2.5rem; font-size: 1.35rem; }
.feature-grid p { color: var(--ink-soft); font-size: .94rem; }

.protocol { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem, 8vw, 7rem); align-items: end; padding-block: clamp(4rem, 9vw, 7rem); }
.protocol h2 { max-width: 18ch; margin: 0; }
.protocol > p { color: var(--ink-soft); font-size: 1.08rem; }
.privacy-pitch { margin-bottom: clamp(4rem, 9vw, 7rem); border-radius: 1.5rem; background: var(--wash); padding: clamp(2rem, 6vw, 4rem); }
.privacy-pitch h2 { margin-top: 0; }
.privacy-pitch p:not(.eyebrow) { max-width: 52rem; color: var(--ink-soft); font-size: 1.06rem; }
.privacy-pitch .text-link { display: inline-block; margin-top: 1rem; }

@media (max-width: 44rem) {
  .masthead { align-items: flex-start; flex-direction: column; padding-block: 1rem; }
  .masthead nav { justify-content: flex-start; }
  .cards { grid-template-columns: 1fr; }
  main { padding-top: 2.5rem; }
  .home main { padding-top: 0; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .app-mark { width: 11rem; justify-self: start; grid-row: 1; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-grid article { min-height: 0; }
  .feature-grid h3 { margin-top: 1.5rem; }
  .protocol { grid-template-columns: 1fr; }
}

@media (min-width: 44.01rem) and (max-width: 65rem) {
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }