.zone-hero .hero-copy { padding-bottom: 6.8rem; }
.zone-calculator #heart-rate-form { padding: 2rem 2.2rem 2.4rem; }
.source-choice { border: 0; margin: 0 0 1.4rem; padding: 0; display: flex; flex-wrap: wrap; gap: .8rem 1.4rem; }
.source-choice legend { width: 100%; margin-bottom: .25rem; }
.source-choice label { display: flex; align-items: center; gap: .55rem; font-weight: 650; }
.source-choice input { width: 1.1rem; min-height: 1.1rem; accent-color: var(--coral); }
.quality-flag { margin: 1rem 0 .25rem; padding: .7rem .85rem; border-left: 4px solid var(--mint-dark); background: #eef8f4; color: var(--ink); }
.zone-results h2 { margin-bottom: .45rem; }
.zone-table-wrap { overflow-x: auto; margin: 1.2rem 0; }
.zone-table { min-width: 720px; }
.zone-table tbody tr:nth-child(1) { border-left: 5px solid #7fb8a6; }
.zone-table tbody tr:nth-child(2) { border-left: 5px solid #4d9e7f; }
.zone-table tbody tr:nth-child(3) { border-left: 5px solid #e0b14c; }
.zone-table tbody tr:nth-child(4) { border-left: 5px solid #e88455; }
.zone-table tbody tr:nth-child(5) { border-left: 5px solid #cf5c53; }
.zone-table td:first-child { font-weight: 800; }
.rounding-note { color: var(--muted); font-size: .94rem; }
.safety-note { margin-top: 1.4rem; background: #fff4e9; }
.no-js-result { display: block; }
.zone-content .factor-list { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.zone-content .factor-list > div { padding: 1rem; }
.zone-content .factor-list h3 { font-size: 1rem; }
.zone-content .factor-list p { font-size: .9rem; }
@media (max-width: 860px) {
  .zone-content .factor-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 700px) {
  .zone-calculator #heart-rate-form { padding-left: 1rem; padding-right: 1rem; }
  .zone-table-wrap { overflow: visible; }
  .zone-table { min-width: 0; display: block; background: transparent; }
  .zone-table caption { display: block; }
  .zone-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .zone-table tbody { display: grid; gap: .8rem; }
  .zone-table tr { display: grid; grid-template-columns: 1fr 1fr; background: white; border-radius: 10px; padding: .65rem; }
  .zone-table td { display: block; border: 0; padding: .35rem .45rem; font-size: .86rem; overflow-wrap: anywhere; }
  .zone-table td:first-child { grid-column: 1 / -1; }
  .zone-table td:nth-child(2)::before { content: "Anteil: "; font-weight: 750; }
  .zone-table td:nth-child(3)::before { content: "% HFmax: "; font-weight: 750; }
  .zone-table td:nth-child(4)::before { content: "Karvonen: "; font-weight: 750; }
  .zone-table td:nth-child(5)::before { content: "Differenz: "; font-weight: 750; }
}
@media (max-width: 430px) {
  .source-choice { display: grid; }
  .zone-table tr { grid-template-columns: 1fr; }
  .zone-table td:first-child { grid-column: 1; }
  .zone-content .factor-list { grid-template-columns: 1fr; }
}