.hr-calc-host { width: 100%; }

    .hr-calc-host .field-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      background: var(--ys-bg-soft);
      padding: 18px;
      border-radius: 10px;
      margin-bottom: 16px;
    }
    @media (max-width: 600px) { .hr-calc-host .field-grid { grid-template-columns: 1fr; } }

    .hr-calc-host label {
      display: block;
      font-family: var(--ys-font-display);
      text-transform: uppercase;
      letter-spacing: 0.1em;
      font-size: 0.72rem;
      color: var(--ys-navy);
      margin-bottom: 6px;
    }
    .hr-calc-host .row { display: flex; align-items: stretch; }
    .hr-calc-host input[type="number"] {
      width: 100%;
      padding: 10px 12px;
      border: 1.5px solid var(--ys-line);
      border-radius: 6px;
      font-size: 0.96rem;
      font-family: var(--ys-font-body);
      background: #fff;
      color: var(--ys-navy);
      box-sizing: border-box;
      transition: border-color 0.15s ease, box-shadow 0.15s ease;
    }
    .hr-calc-host input:focus {
      outline: none;
      border-color: var(--wf-coral);
      box-shadow: 0 0 0 3px rgba(250, 119, 60, 0.18);
    }
    .hr-calc-host .row input { border-radius: 6px 0 0 6px; }
    .hr-calc-host .row .unit {
      padding: 0 12px;
      background: var(--ys-navy); color: #fff;
      font-family: var(--ys-font-display);
      letter-spacing: 0.06em; font-size: 0.74rem;
      display: flex; align-items: center;
      border-radius: 0 6px 6px 0;
      min-width: 50px; justify-content: center;
    }
    .hr-calc-host .field-help { font-size: 0.78rem; color: var(--ys-muted); margin-top: 6px; }

    .hr-calc-host .zones-grid {
      display: grid; grid-template-columns: 1fr 1fr; gap: 18px;
      margin-top: 8px;
    }
    @media (max-width: 760px) { .hr-calc-host .zones-grid { grid-template-columns: 1fr; } }

    .hr-calc-host .zones-card {
      background: #fff;
      border: 1px solid var(--ys-line);
      border-radius: 12px;
      padding: 18px;
    }
    .hr-calc-host .zones-card h4 {
      font-family: var(--ys-font-display);
      letter-spacing: 0.12em; text-transform: uppercase;
      font-size: 0.86rem;
      color: var(--ys-navy);
      margin: 0 0 4px;
    }
    .hr-calc-host .zones-card .lthr-tag {
      font-family: var(--ys-font-display);
      letter-spacing: 0.04em;
      color: var(--wf-coral);
      font-size: 0.82rem;
      margin-bottom: 12px;
    }
    .hr-calc-host .zone-row {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 10px;
      padding: 10px 12px;
      background: var(--ys-bg-soft);
      border-left: 4px solid var(--ys-navy);
      margin-bottom: 6px;
      border-radius: 6px;
      font-size: 0.92rem;
      align-items: center;
    }
    .hr-calc-host .zone-row.featured { border-left-color: var(--wf-coral); }
    .hr-calc-host .zone-name {
      font-family: var(--ys-font-display);
      letter-spacing: 0.04em;
      color: var(--ys-navy);
      font-weight: 600;
    }
    .hr-calc-host .zone-name small {
      display: block;
      font-family: var(--ys-font-body);
      font-weight: 400;
      color: var(--ys-muted);
      font-size: 0.78rem;
      letter-spacing: 0;
      margin-top: 2px;
    }
    .hr-calc-host .zone-bpm {
      font-family: var(--ys-font-display);
      color: var(--ys-navy);
      font-weight: 700;
      letter-spacing: 0.02em;
      text-align: right;
      white-space: nowrap;
    }
    .hr-calc-host .zone-bpm small {
      display: block;
      color: var(--ys-muted);
      font-size: 0.74rem;
      letter-spacing: 0;
      font-weight: 400;
    }
    .hr-calc-host .placeholder {
      padding: 18px;
      text-align: center;
      color: var(--ys-muted);
      background: var(--ys-bg-soft);
      border-radius: 6px;
      font-size: 0.9rem;
    }