.cardio-calculator {
  max-width: 840px;
  margin: 42px auto;
  padding: 0 20px;
}
.cardio-calculator .form-container,
.cardio-calculator #results {
  padding: 28px;
  border: 1px solid rgba(0, 0, 0, 0.14);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}
.cardio-calculator .form-container {
  display: grid;
  gap: 18px;
}
.cardio-calculator input,
.cardio-calculator select {
  width: 100%;
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid #87938e;
  border-radius: 6px;
  background: #fff;
  font: inherit;
}
.time-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.quick-distances,
.mode-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.mode-options { display:grid;grid-template-columns:1fr 1fr;padding:3px;border:1px solid var(--ui-border);border-radius:10px;background:#eef3f1; }
.mode-options label { position:relative;display:flex;align-items:center;justify-content:center;padding:0!important;border:0!important;border-radius:7px!important;background:transparent!important; }
.mode-options input { position:absolute;width:1px!important;height:1px;opacity:0; }
.mode-options label:has(input:checked) { background:var(--ui-dark)!important;color:#fff!important;font-weight:700; }
.mode-options label:has(input:focus-visible) { outline:3px solid rgba(0,200,150,.45);outline-offset:2px; }
.quick-distances button,
.mode-options label {
  min-height: 44px;
  padding: 10px 13px;
  border: 1px solid #aeb9b4;
  border-radius: 6px;
  background: #f5f7f6;
}
.quick-distances button[aria-pressed="true"] { border-color:var(--ui-dark);background:var(--ui-dark);color:#fff;font-weight:700; }
.cardio-calculator #results {
  margin-top: 24px;
}
@media(max-width:360px){.time-grid{grid-template-columns:1fr}.time-grid label{display:grid;grid-template-columns:72px 1fr;align-items:center;gap:8px}}
.primary-result > strong {
  display: block;
  font-size: clamp(2.2rem, 7vw, 4rem);
  line-height: 1.1;
}
.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.metric-grid div,
.zone-row {
  padding: 14px;
  border: 1px solid #d3dad7;
  border-radius: 8px;
}
.split-table {
  width: 100%;
  border-collapse: collapse;
}
.split-table th,
.split-table td {
  padding: 9px;
  border-bottom: 1px solid #d6ddda;
  text-align: left;
}
.zone-list {
  display: grid;
  gap: 10px;
}
.zone-row {
  display: grid;
  grid-template-columns: 90px 130px 1fr;
  gap: 12px;
  align-items: center;
}
.cardio-content {
  max-width: 860px;
  margin: 38px auto;
  padding: 0 20px;
}
.cardio-content section {
  margin: 36px 0;
}
@media (max-width: 600px) {
  .cardio-calculator .form-container,
  .cardio-calculator #results {
    padding: 18px;
  }
  .metric-grid {
    grid-template-columns: 1fr;
  }
  .zone-row {
    grid-template-columns: 70px 1fr;
  }
  .zone-row p {
    grid-column: 1/-1;
  }
  .time-grid {
    gap: 5px;
  }
  .split-table {
    font-size: 0.9rem;
  }
}