:root {
  color-scheme: light dark;
  --background: #f5f5fb;
  --surface: #ffffff;
  --text: #23272d;
  --muted: #6c7280;
  --border: #e0e0ee;
  --link: #4f46e5;
}

* {
  box-sizing: border-box;
}

body {
  max-width: 46rem;
  margin: 0 auto;
  padding: 40px 24px 80px;
  color: var(--text);
  background: var(--background);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  overflow-wrap: break-word;
}

header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 8px;
}

.mark {
  position: relative;
  flex: none;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(140deg, #6366f1, #8b5cf6);
}

.mark::after {
  content: "";
  position: absolute;
  top: 14px;
  left: 15px;
  width: 16px;
  height: 8px;
  border: 3px solid #fff;
  border-top: 0;
  border-right: 0;
  border-radius: 1px;
  transform: rotate(-45deg);
}

h1 {
  margin: 0;
  font-size: clamp(1.35rem, 5vw, 1.6rem);
  line-height: 1.2;
  letter-spacing: -.02em;
}

h2 {
  margin: 2.2em 0 .5em;
  font-size: 1.05rem;
  line-height: 1.35;
  letter-spacing: -.01em;
}

.date {
  margin: 0 0 2rem;
  color: var(--muted);
  font-size: .9rem;
}

.lead {
  padding: 18px 20px;
  border: 2px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  font-weight: 600;
}

ol,
ul {
  padding-left: 1.4em;
}

li {
  margin: .45em 0;
}

a {
  color: var(--link);
  text-underline-offset: 2px;
}

code {
  padding: 1px 5px;
  border-radius: 5px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: .88em;
}

footer {
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 2px solid var(--border);
  color: var(--muted);
  font-size: .9rem;
}

@media (max-width: 420px) {
  body {
    padding: 28px 18px 56px;
  }

  .mark {
    width: 42px;
    height: 42px;
    border-radius: 12px;
  }

  .mark::after {
    top: 12px;
    left: 13px;
    width: 14px;
    height: 7px;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #14151a;
    --surface: #1d1f27;
    --text: #e8eaf0;
    --muted: #9aa0ad;
    --border: #2e313c;
    --link: #a5b4fc;
  }
}