:root {
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0a66d9;
  --card: #f5f5f7;
  --border: #d2d2d7;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111113;
    --text: #f5f5f7;
    --muted: #a1a1a6;
    --accent: #4da3ff;
    --card: #1c1c1e;
    --border: #38383a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
}

header, main, footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  padding-bottom: 8px;
}

header .brand { font-weight: 700; color: var(--text); }

nav a { margin-left: 18px; }

h1 { font-size: 2.2rem; line-height: 1.2; margin: 1.2em 0 0.4em; }
h2 { font-size: 1.4rem; margin: 1.6em 0 0.4em; }
h3 { font-size: 1.1rem; margin: 1.2em 0 0.3em; }

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

.lead { font-size: 1.2rem; color: var(--muted); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px 24px;
  margin: 20px 0;
}

.card h2 { margin-top: 0.2em; }

.button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 10px 20px;
  border-radius: 999px;
  font-weight: 600;
}
.button:hover { opacity: 0.88; text-decoration: none; }

.badge {
  display: inline-block;
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 999px;
  padding: 2px 12px;
  font-size: 0.8rem;
  vertical-align: middle;
  margin-left: 8px;
}

.features { padding-left: 1.2em; }
.features li { margin: 0.55em 0; }
.features strong { color: var(--text); }

footer {
  margin-top: 48px;
  padding-top: 18px;
  padding-bottom: 36px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}
footer a { margin-left: 14px; }

.app-head {
  display: flex;
  align-items: center;
  gap: 16px;
}
.app-head h1, .app-head h2 { margin: 0; }
.app-icon {
  width: 72px;
  height: 72px;
  flex: none;
  border-radius: 22%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
}
.app-icon.large { width: 96px; height: 96px; }

.badge.live {
  color: var(--accent);
  border-color: var(--accent);
}
.note { color: var(--muted); }
.button + .button, .button + a { margin-left: 10px; }
.button.secondary {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 9px 19px;
}