body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 16px;
  line-height: 1.6;
  color: #1a1a1a;
}
header {
  margin-bottom: 32px;
  border-bottom: 1px solid #eee;
  padding-bottom: 16px;
}
.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
  color: #1a1a1a;
}
h1 { font-size: 1.75rem; margin-top: 0; }
h2 { font-size: 1.3rem; margin-top: 2rem; }
table { border-collapse: collapse; width: 100%; margin: 1.5rem 0; }
th, td { border: 1px solid #ddd; padding: 8px 12px; text-align: left; }
th { background: #f7f7f7; }
footer {
  margin-top: 48px;
  padding-top: 16px;
  border-top: 1px solid #eee;
  font-size: 0.85rem;
  color: #666;
}
.article-list a {
  display: block;
  padding: 12px 0;
  border-bottom: 1px solid #eee;
  text-decoration: none;
  color: #1a1a1a;
  font-weight: 600;
}
.article-list p {
  margin: 4px 0 0;
  color: #555;
  font-weight: 400;
  font-size: 0.9rem;
}
.article-list li {
  list-style: none;
}

/* Calculator cards */
.calc-card {
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 20px;
  margin: 24px 0;
  background: #fafafa;
}
.calc-card h2 { margin-top: 0; }
.calc-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px 20px;
}
.calc-row { display: flex; flex-direction: column; }
.calc-row label { font-size: 0.85rem; color: #555; margin-bottom: 4px; }
.calc-row input,
.calc-row select {
  padding: 8px 10px;
  font-size: 1rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  background: #fff;
}
.calc-results {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
  margin-top: 16px;
}
.calc-result {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 10px 12px;
  text-align: center;
}
.calc-result-main {
  border-color: #1a73e8;
  background: #eef4fd;
}
.calc-label { display: block; font-size: 0.75rem; color: #666; }
.calc-value { display: block; font-size: 1.1rem; font-weight: 700; margin-top: 2px; }
.calc-value-sub { display: block; font-size: 0.75rem; color: #666; margin-top: 2px; }
.calc-note { font-size: 0.8rem; color: #777; margin: 12px 0 0; }
.calc-note-table { font-size: 0.85rem; margin: 12px 0; }
.calc-note-table caption { font-size: 0.75rem; color: #666; margin-bottom: 6px; text-align: left; }
.calc-btn {
  display: inline-block;
  margin: 12px 0 0;
  padding: 8px 16px;
  font-size: 0.9rem;
  border: 1px solid #1a73e8;
  border-radius: 6px;
  background: #fff;
  color: #1a73e8;
  cursor: pointer;
}
.calc-btn:hover { background: #eef4fd; }
.calc-btn-small { padding: 4px 10px; margin: 24px 0 0; }
.dp-row {
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 12px;
  margin-top: 10px;
  background: #fff;
}
.dp-fields {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 10px 16px;
}
.dp-remove {
  display: block;
  margin-left: auto;
}
@media (max-width: 560px) {
  .calc-form { grid-template-columns: 1fr; }
  .calc-results { grid-template-columns: 1fr; }
  .dp-fields { grid-template-columns: 1fr; }
}