:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #dbe3f1;
  --brand: #2b6de5;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Noto Sans CJK SC", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.container.narrow {
  max-width: 760px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
  margin-bottom: 14px;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 34px;
}

h2 {
  margin: 0 0 10px;
  font-size: 20px;
}

p, li {
  line-height: 1.65;
  color: var(--muted);
}

a {
  color: var(--brand);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.links {
  display: flex;
  gap: 14px;
  margin-top: 10px;
}

.footer {
  text-align: center;
  color: #64748b;
  font-size: 13px;
  padding-top: 8px;
}