/* ===== CSS BASELINE: SEO-FIRST ===== */

:root {
  --text: #1a1a1a;
  --muted: #555;
  --border: #e5e7eb;
  --bg: #ffffff;
  --accent: #2563eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont,
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

h1, h2, h3 {
  line-height: 1.3;
  margin-top: 2.2rem;
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.4rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.3rem;
}

h3 {
  font-size: 1.1rem;
}

p {
  margin: 0.75rem 0;
}

ul {
  padding-left: 1.25rem;
}

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

a:hover {
  text-decoration: underline;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0 2rem;
  font-size: 0.95rem;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.6rem 0.7rem;
  vertical-align: top;
}

th {
  background: #f9fafb;
  text-align: left;
}

tr:nth-child(even) td {
  background: #fcfcfd;
}

/* Utility blocks */
.notice {
  background: #f1f5f9;
  border-left: 4px solid var(--accent);
  padding: 0.75rem 1rem;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

/* Footer */
footer {
  margin-top: 4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
}

/* Mobile */
@media (max-width: 640px) {
  table {
    font-size: 0.9rem;
  }

  h1 {
    font-size: 1.6rem;
  }
}