:root {
  --bg: #0f1115;
  --surface: #171a21;
  --border: #262b35;
  --text: #e8eaed;
  --muted: #a2a9b6;
  --accent: #28ae42;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

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

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.site-header,
.site-footer,
main {
  margin: 0 auto;
  max-width: 720px;
  padding: 0 24px;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 28px;
  padding-bottom: 28px;
}

.brand {
  color: var(--text);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 8px;
  border-radius: 3px;
  background: var(--accent);
}

.site-header nav a {
  color: var(--muted);
  font-size: 15px;
  text-decoration: none;
}

.site-header nav a:hover {
  color: var(--text);
}

main {
  padding-bottom: 56px;
}

h1 {
  font-size: 34px;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 8px 0 12px;
}

.app-icon {
  display: block;
  width: 72px;
  height: 72px;
  border-radius: 16px;
  border: 1px solid var(--border);
  margin: 4px 0 20px;
}

h2 {
  font-size: 21px;
  letter-spacing: -0.01em;
  margin: 40px 0 10px;
}

h3 {
  font-size: 17px;
  margin: 22px 0 4px;
}

.lede {
  color: var(--muted);
  font-size: 19px;
  margin: 0 0 28px;
}

p,
li {
  margin: 0 0 12px;
}

ul {
  margin: 0 0 16px;
  padding-left: 22px;
}

li strong {
  color: var(--text);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px 22px;
  margin: 24px 0;
}

.card h2 {
  margin-top: 0;
}

.note {
  color: var(--muted);
  font-size: 15px;
}

.meta {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 32px;
}

.cta {
  display: inline-block;
  background: var(--accent);
  color: #06210d;
  font-weight: 600;
  padding: 11px 20px;
  border-radius: 10px;
  text-decoration: none;
  margin: 6px 0 4px;
}

.cta:hover {
  filter: brightness(1.08);
}

.site-footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 15px;
  padding-top: 22px;
  padding-bottom: 40px;
}

.site-footer p {
  margin: 0 0 6px;
}