:root {
  color-scheme: light;
  --background: #f5f8fc;
  --surface: #ffffff;
  --ink: #172033;
  --body: #475569;
  --muted: #64748b;
  --line: #dbe7fb;
  --accent: #2563eb;
  --accent-soft: #eff5ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgb(37 99 235 / 10%), transparent 34rem),
    var(--background);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  line-height: 1.75;
}

main {
  width: min(900px, calc(100% - 32px));
  margin: 0 auto;
  padding: 42px 0 56px;
}

header {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: 0 16px 50px rgb(15 23 42 / 7%);
}

.company {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: clamp(30px, 7vw, 48px);
  line-height: 1.18;
}

.date {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.intro {
  margin: 20px 0 0;
  padding: 16px 18px;
  color: #334155;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  border-radius: 12px;
}

article {
  margin-top: 22px;
  padding: 28px;
  background: rgb(255 255 255 / 88%);
  border: 1px solid #e6edf8;
  border-radius: 22px;
}

section + section {
  margin-top: 28px;
  padding-top: 26px;
  border-top: 1px solid #e7edf5;
}

h2 {
  margin: 0 0 12px;
  font-size: 21px;
  line-height: 1.4;
}

ol {
  margin: 0;
  padding-left: 1.4em;
}

li {
  padding-left: 0.2em;
  color: var(--body);
  font-size: 16px;
}

li + li {
  margin-top: 9px;
}

footer {
  margin-top: 26px;
  color: var(--muted);
  text-align: right;
  font-size: 14px;
}

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

@media (max-width: 640px) {
  main {
    width: min(100% - 24px, 900px);
    padding-top: 20px;
  }

  header,
  article {
    padding: 20px;
    border-radius: 16px;
  }
}