.calculator-error { margin: 12px 0; color: #9d2525; font-size: 14px; line-height: 1.6; }
.calculator-error:empty { display: none; }
.calculator-layout input[aria-invalid="true"] { outline: 2px solid #b33a3a; outline-offset: 2px; }
.result-card[data-result-state="error"] .result-number { font-size: 28px; }
.tool-jump-links { display: flex; flex-wrap: wrap; gap: 10px 22px; margin: 20px 0 28px; }
.tool-jump-links a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: underline; text-underline-offset: 4px; }
.tool-group { scroll-margin-top: 100px; }
.tool-group + .tool-group { margin-top: 40px; }
.tool-group h2 { margin-bottom: 14px; }
.fuel-comparison { margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border); }
.fuel-comparison h3 { font-size: 18px; margin: 0 0 12px; }
.fuel-comparison[hidden], .fuel-comparison-fields[hidden] { display: none; }
.fuel-compare-toggle { display: flex; align-items: center; gap: 10px; min-height: 44px; margin: 14px 0; font-weight: 700; }
.fuel-compare-toggle input { width: 18px; height: 18px; }
.tool-related-links { display: flex; flex-wrap: wrap; gap: 12px 20px; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border); }
.tool-related-links a { min-height: 44px; display: inline-flex; align-items: center; text-decoration: underline; text-underline-offset: 4px; font-size: 14px; }
.tool-table { overflow-x: auto; margin: 16px 0; }
.tool-table table { width: 100%; border-collapse: collapse; font-size: 14px; }
.tool-table th, .tool-table td { text-align: left; padding: 12px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.tool-table caption { text-align: left; margin-bottom: 10px; font-weight: 700; }
.result-share-controls { position: relative; display: flex; flex-wrap: wrap; gap: 8px; }
.result-share-controls[hidden], .result-share-menu[hidden] { display: none; }
.result-share-menu { flex-basis: 100%; display: flex; gap: 8px; padding-top: 8px; }
.result-source-link.text-link { display: inline-flex; align-items: center; min-height: 44px; font-size: 14px; text-decoration: underline; text-underline-offset: 4px; }
.compact-tool-links { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 14px; margin: 32px 0; }
.compact-tool-links a { padding: 18px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface); font-weight: 700; }
.home-hero.home-intro { display: block; margin-bottom: 12px; }
.home-intro .hero-copy { padding: 4px 0; }
.home-intro h1 { font-size: clamp(28px,4vw,42px); line-height: 1.25; }
.home-intro .hero-copy > p { font-size: 16px; margin-top: 10px; }
body[data-page="home"] .calculator-finder { margin: 12px 0 30px; padding: 20px 0; }
.popular-tool-links { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 10px; margin: 18px 0 0; }
.popular-tool-links[hidden] { display: none; }
.recent-calculators[hidden] { display: none; }
.calculator-search-status:empty { display: none; }
.result-share-controls > .button { flex: 1; }
.result-share-menu > .button { flex: 1; }
.popular-tool-links a { display: flex; align-items: center; justify-content: center; min-height: 52px; padding: 12px; background: var(--surface); border: 1px solid var(--border); border-radius: 6px; font-size: 15px; font-weight: 700; }
.popular-tool-links a:hover { border-color: var(--primary); }
.home-secondary-banner { max-width: 520px; margin: 36px auto; }
.home-secondary-banner img { display: block; width: 100%; height: auto; border-radius: 6px; }
.home-season-note { margin: 24px 0; padding: 18px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); line-height: 1.7; }
.home-season-note summary { cursor: pointer; font-weight: 700; min-height: 44px; padding: 10px 0; }
@media (max-width: 600px) {
  body[data-page="home"] .page-shell { padding-top: 18px; }
  .home-intro h1 { font-size: 28px; }
  .home-intro .hero-copy > p { font-size: 15px; line-height: 1.5; }
  body[data-page="home"] .calculator-finder-heading { display: block; }
  body[data-page="home"] .calculator-finder .section-heading { margin-bottom: 14px; }
  body[data-page="home"] .calculator-finder h2 { font-size: 22px; }
  body[data-page="home"] .calculator-finder-form > div { grid-template-columns: minmax(0,1fr) auto; }
  body[data-page="home"] .calculator-finder-form .button { width: auto; }
  .popular-tool-links { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .compact-tool-links { grid-template-columns: 1fr; }
  .result-share-menu { flex-wrap: wrap; }
}