:root {
  --primary: #1a5276;
  --secondary: #2c3e50;
  --text: #222;
  --muted: #666;
  --border: #e1e5e9;
  --bg-alt: #f6f8fa;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC",
               "Heiti TC", "Microsoft JhengHei", "Noto Sans TC", sans-serif;
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
  line-height: 1.65;
  color: var(--text);
  background: #fff;
}

h1 {
  color: var(--primary);
  font-size: 1.9rem;
  margin: 0 0 0.3rem;
  letter-spacing: 0.02em;
}

h2 {
  color: var(--secondary);
  font-size: 1.25rem;
  margin: 0 0 1.5rem;
  font-weight: 500;
}

h3 {
  color: var(--primary);
  font-size: 1.15rem;
  margin: 2.25rem 0 0.75rem;
  padding-bottom: 0.3rem;
  border-bottom: 2px solid var(--border);
}

p { margin: 0.75rem 0; }

blockquote {
  margin: 1rem 0;
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--primary);
  color: var(--muted);
  background: var(--bg-alt);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.5rem 0 1.25rem;
  table-layout: auto;
  word-break: break-word;
}

th, td {
  padding: 0.55rem 0.65rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--bg-alt);
  font-weight: 600;
  color: var(--secondary);
  border-bottom: 2px solid #cfd7df;
}

tr:hover td { background: #fafbfc; }

th:first-child, td:first-child {
  width: 3em;
  text-align: center;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

th:last-child, td:last-child {
  width: 5em;
  text-align: right;
  color: var(--muted);
  white-space: nowrap;
}

a {
  color: var(--primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

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

strong { color: var(--secondary); }

hr {
  margin: 3rem 0 1rem;
  border: 0;
  border-top: 1px solid var(--border);
}

em {
  display: block;
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  font-style: normal;
  margin-top: 1.5rem;
}

@media (max-width: 640px) {
  body { padding: 1.25rem 0.9rem 2.5rem; }
  h1 { font-size: 1.45rem; }
  h2 { font-size: 1.05rem; }
  table { font-size: 0.9rem; }
  th, td { padding: 0.45rem 0.45rem; }
  th:last-child, td:last-child { width: 4em; }
}