:root {
  --fg: #1c1c1e;
  --fg-soft: #3a3a3c;
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --accent: #ff6b35;
  --accent-fg: #ffffff;
  --border: #e5e5ea;
  --max: 880px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f2f2f7;
    --fg-soft: #aeaeb2;
    --bg: #000000;
    --bg-alt: #1c1c1e;
    --border: #38383a;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  padding-top: 12px;
  padding-bottom: 12px;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  font-weight: 700;
  font-size: 17px;
  text-decoration: none;
  color: var(--fg);
  letter-spacing: -0.01em;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 20px;
  margin: 0;
  padding: 0;
}

.nav-links a {
  color: var(--fg-soft);
  text-decoration: none;
  font-size: 15px;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--fg);
}

.hero {
  padding: 64px 0 48px;
  background: var(--bg);
}

.hero h1 {
  font-size: 44px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  font-weight: 700;
}

.lead {
  font-size: 19px;
  color: var(--fg-soft);
  max-width: 620px;
  margin: 0 0 24px;
}

.platforms {
  font-size: 14px;
  color: var(--fg-soft);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 8px;
}

.cta-note {
  font-size: 14px;
  color: var(--fg-soft);
  margin: 8px 0 0;
}

.features,
.privacy-pitch,
.cta {
  padding: 56px 0;
  border-top: 1px solid var(--border);
}

.privacy-pitch {
  background: var(--bg-alt);
}

.features h2,
.privacy-pitch h2,
.cta h2 {
  font-size: 28px;
  letter-spacing: -0.01em;
  margin: 0 0 24px;
}

.feature-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 28px;
}

.feature-grid h3 {
  font-size: 18px;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

.feature-grid p {
  color: var(--fg-soft);
  font-size: 15px;
  margin: 0;
}

.privacy-pitch p {
  max-width: 720px;
  font-size: 16px;
}

.link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.link:hover {
  text-decoration: underline;
}

.page {
  padding: 48px 0 96px;
}

.page h1 {
  font-size: 36px;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

.page h2 {
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 40px 0 12px;
}

.page h3 {
  font-size: 17px;
  margin: 28px 0 8px;
}

.page p,
.page ul {
  font-size: 16px;
  color: var(--fg);
  max-width: 720px;
}

.page ul {
  padding-left: 24px;
}

.page li {
  margin: 6px 0;
}

.page code {
  background: var(--bg-alt);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  font-family: "SF Mono", Menlo, monospace;
}

.last-updated {
  color: var(--fg-soft);
  font-size: 14px;
}

.mail-link {
  font-size: 18px;
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
}

.mail-link:hover {
  text-decoration: underline;
}

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

footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  background: var(--bg-alt);
  color: var(--fg-soft);
  font-size: 14px;
}

footer p {
  margin: 4px 0;
}

footer a {
  color: var(--fg-soft);
  text-decoration: none;
}

footer a:hover {
  color: var(--fg);
}

@media (max-width: 600px) {
  .hero {
    padding: 40px 0 32px;
  }
  .hero h1 {
    font-size: 32px;
  }
  .lead {
    font-size: 17px;
  }
  .nav-links {
    gap: 14px;
  }
  .nav-links a {
    font-size: 14px;
  }
}