:root {
  color-scheme: light dark;
  --bg: #fbfbfd;
  --surface: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --border: #e5e5ea;
  --accent: #fffc00;      /* Snapchat yellow */
  --accent-ink: #1d1d1f;
  --link: #0a66c2;
  --radius: 16px;
  --maxw: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --surface: #1c1c1e;
    --text: #f5f5f7;
    --muted: #98989d;
    --border: #38383a;
    --link: #4aa3ff;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header.site {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: saturate(180%) blur(12px);
}
header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--text);
}
.brand .logo {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  object-fit: cover;
  display: block;
}
nav.site a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 0.95rem;
}
nav.site a:hover { color: var(--text); }

/* Hero */
.hero {
  text-align: center;
  padding: 72px 0 48px;
}
.hero .logo-lg {
  width: 88px;
  height: 88px;
  border-radius: 22px;
  object-fit: cover;
  display: inline-block;
  margin-bottom: 24px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}
.hero h1 {
  font-size: 2.6rem;
  line-height: 1.1;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}
.hero p.tagline {
  font-size: 1.25rem;
  color: var(--muted);
  margin: 0 auto;
  max-width: 32ch;
}

/* Buttons */
.cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 28px 8px 0;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border);
  color: var(--text);
  background: var(--surface);
}
.cta.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: transparent;
}

/* Feature grid */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  padding: 24px 0 8px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.card .ico { font-size: 26px; }
.card h3 { margin: 12px 0 6px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* Content pages */
main.doc { padding: 40px 0 24px; }
main.doc h1 { font-size: 2rem; letter-spacing: -0.02em; margin: 0 0 4px; }
main.doc .updated { color: var(--muted); font-size: 0.9rem; margin: 0 0 32px; }
main.doc h2 { font-size: 1.3rem; margin: 36px 0 8px; letter-spacing: -0.01em; }
main.doc p, main.doc li { color: var(--text); }
main.doc ul { padding-left: 22px; }
main.doc li { margin: 6px 0; }
main.doc a { color: var(--link); }
.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  padding: 16px 18px;
  margin: 20px 0;
}
.callout p { margin: 0; }

/* Footer */
footer.site {
  border-top: 1px solid var(--border);
  margin-top: 56px;
  padding: 28px 0;
  color: var(--muted);
  font-size: 0.9rem;
}
footer.site .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  justify-content: space-between;
  align-items: center;
}
footer.site a { color: var(--muted); text-decoration: none; }
footer.site a:hover { color: var(--text); }
footer.site nav a { margin-left: 16px; }
footer.site .tm {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}
footer.site .tm p {
  margin: 0;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--muted);
}

@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .hero { padding: 48px 0 32px; }
  nav.site a { margin-left: 12px; font-size: 0.9rem; }
}