:root {
  --ink: #12151b;
  --ink-mute: #5b6270;
  --accent: #1b47e0;
  --accent-soft: #edf1ff;
  --bg: #f6f7fb;
  --card: #ffffff;
  --line: #e6e9f0;
}
* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
}
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  line-height: 1.7;
}
main {
  width: 100%;
  max-width: 560px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 40px 36px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-weight: 800;
  font-size: 18px;
}
.mark {
  width: 32px;
  height: 32px;
  border-radius: 10px;
  background: var(--accent);
  color: #ffffff;
  display: grid;
  place-items: center;
  font-size: 14px;
  font-weight: 800;
}
h1 {
  font-size: 26px;
  line-height: 1.3;
  margin: 28px 0 10px;
  text-wrap: balance;
}
p {
  margin: 0 0 12px;
  color: var(--ink-mute);
  font-size: 15px;
}
.tag {
  display: inline-block;
  margin-top: 8px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
}
nav {
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  font-size: 14px;
}
nav a {
  color: var(--ink-mute);
  text-decoration: none;
}
nav a:hover,
nav a:focus-visible {
  color: var(--accent);
}
@media (max-width: 480px) {
  main {
    padding: 32px 22px;
  }
  h1 {
    font-size: 22px;
  }
}