:root {
  --accent: #209cf3;
  --accent-dark: #1486db;
  --ink: #1d1d1f;
  --ink-soft: #51525a;
  --ink-mute: #86868b;
  --line: #e6e6ea;
  --bg: #ffffff;
  --bg-soft: #f5f6f8;
  --radius: 16px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 28px 22px 80px;
}

/* Header / brand */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 0 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 34px;
}
.brand .logo {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(160deg, #4fb6ff 0%, var(--accent) 55%, var(--accent-dark) 100%);
  flex: 0 0 auto;
  box-shadow: 0 2px 8px rgba(32, 156, 243, 0.35);
}
.brand .name {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand .name span { color: var(--accent); }

/* Typography */
h1 {
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 700;
  margin: 0 0 8px;
}
h2 {
  font-size: 21px;
  letter-spacing: -0.01em;
  font-weight: 650;
  margin: 42px 0 10px;
}
h3 {
  font-size: 17px;
  font-weight: 650;
  margin: 26px 0 6px;
}
p, li { color: var(--ink-soft); }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); text-decoration: underline; }
strong { color: var(--ink); font-weight: 600; }

.lede {
  font-size: 19px;
  color: var(--ink-soft);
  margin: 0 0 8px;
}
.meta {
  font-size: 14px;
  color: var(--ink-mute);
  margin: 0 0 8px;
}

ul { padding-left: 22px; }
li { margin: 6px 0; }

/* Callout card */
.card {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 22px 0;
}
.card p:last-child { margin-bottom: 0; }
.card p:first-child { margin-top: 0; }

/* Buttons (landing) */
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 22px;
  border-radius: 980px;
  font-weight: 600;
  font-size: 16px;
  background: var(--accent);
  color: #fff;
  transition: background 0.15s ease, transform 0.05s ease;
}
.btn:hover { background: var(--accent-dark); text-decoration: none; color: #fff; }
.btn:active { transform: scale(0.98); }
.btn.secondary {
  background: var(--bg-soft);
  color: var(--ink);
  border: 1px solid var(--line);
}
.btn.secondary:hover { background: #ececf0; color: var(--ink); }

/* Footer */
.foot {
  margin-top: 56px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  color: var(--ink-mute);
}
.foot a { color: var(--ink-mute); }
.foot a:hover { color: var(--accent); }
.foot .row { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 10px; }

@media (max-width: 480px) {
  body { font-size: 16px; }
  h1 { font-size: 28px; }
  .wrap { padding: 22px 18px 64px; }
}