:root {
  --bg: #0f1720;
  --panel: #172231;
  --text: #e8eef6;
  --muted: #9aabb8;
  --accent: #3db8a0;
  --line: rgba(255, 255, 255, 0.08);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(900px 500px at 10% -10%, #1d4a45 0%, transparent 55%),
    radial-gradient(700px 400px at 100% 0%, #243456 0%, transparent 50%),
    var(--bg);
}

.shell {
  max-width: 720px;
  margin: 12vh auto;
  padding: 2.5rem;
  background: color-mix(in srgb, var(--panel) 92%, black);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.brand {
  margin: 0 0 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--accent);
}

h1 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  line-height: 1.2;
}

.lead {
  margin: 0 0 1.5rem;
  color: #b7c4d4;
  line-height: 1.6;
}

.meta {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.meta li {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 0.75rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.95rem;
}

.meta span {
  color: #7f8ea3;
}

.stamp {
  margin: 1.25rem 0 0;
  font-size: 0.85rem;
  color: #7f8ea3;
}