:root {
  --bg: #dce3ea;
  --paper: #f3f6f9;
  --ink: #1e2c28;
  --muted: #5d6f69;
  --line: #c3ced8;
  --accent: #2c5f7c;
  --accent-soft: #d5e6f0;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 18px;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 8%, #edf3ef 0, transparent 42%),
    var(--bg);
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  line-height: 1.7;
}

.wrap {
  width: min(40rem, calc(100% - 2rem));
  margin: 0 auto;
  padding: 2.5rem 0 3.5rem;
}

.plate {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  padding: 0.2rem 0.65rem 0.2rem 0.35rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
}

.led {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

header h1 {
  margin: 0 0 0.6rem;
  font-family: "Songti SC", "STSong", "SimSun", serif;
  font-size: clamp(2rem, 6vw, 2.8rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.lead {
  margin: 0 0 1.75rem;
  color: var(--muted);
}

.card {
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--paper);
  box-shadow: 8px 12px 0 rgba(47, 111, 94, 0.08);
}

.card p:last-child {
  margin-bottom: 0;
}

nav {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

a:hover {
  border-bottom-color: var(--accent);
}

.btn {
  display: inline-block;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  border-bottom: 1px solid var(--accent);
}

.btn:hover {
  background: var(--accent);
  color: #f4f7f5;
}

footer {
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.82rem;
}