:root {
  --bg: #fafafa;
  --fg: #1f2328;
  --fg-muted: #59636e;
  --border: #d1d9e0;
  --link: #0969da;
  --accent: #0969da;
  --card-bg: #ffffff;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 4px 12px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --fg: #e6edf3;
    --fg-muted: #9198a1;
    --border: #30363d;
    --link: #4493f8;
    --accent: #4493f8;
    --card-bg: #161b22;
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 4px 12px rgba(0, 0, 0, 0.3);
  }
}

* { 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", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

header {
  padding: 96px 24px 64px;
  text-align: center;
}

.app-icon {
  width: 144px;
  height: 144px;
  border-radius: 32px;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.12));
}

h1 {
  font-size: 56px;
  font-weight: 700;
  margin: 24px 0 8px;
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 22px;
  color: var(--fg-muted);
  margin: 0 0 4px;
}

.subtagline {
  font-size: 16px;
  color: var(--fg-muted);
  opacity: 0.85;
  margin: 0 0 32px;
  letter-spacing: 0.02em;
}

.cta {
  display: inline-block;
  background: var(--accent);
  color: white;
  padding: 14px 28px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 16px;
}
.cta:hover { text-decoration: none; opacity: 0.9; }

main { max-width: 960px; margin: 0 auto; padding: 0 24px; }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  margin: 48px 0 96px;
}

.feature {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  box-shadow: var(--card-shadow);
}

.feature h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
}

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

footer {
  text-align: center;
  padding: 48px 24px;
  border-top: 1px solid var(--border);
  color: var(--fg-muted);
  font-size: 14px;
}

footer nav { margin-bottom: 12px; }
footer span { margin: 0 8px; opacity: 0.5; }

/* Doc pages (privacy, support) */
body.doc main {
  max-width: 760px;
  padding: 64px 24px;
}

body.doc h1 {
  font-size: 36px;
  margin: 0 0 16px;
  text-align: left;
}

body.doc h2 {
  margin-top: 36px;
  font-size: 22px;
  font-weight: 600;
}

body.doc h3 {
  margin-top: 28px;
  font-size: 17px;
  font-weight: 600;
}

body.doc code {
  background: var(--card-bg);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

body.doc ul { padding-left: 1.4em; }

.back {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}