/* Zone 2 heart rate by age: tables, calculator and age navigation. Extends research.css tokens. */
.z2-prose h3{font-size:1.15rem;line-height:1.5;margin:26px 0 8px;color:var(--text)}
.z2-answer-list{list-style:none;padding:0;margin:18px 0;display:grid;gap:10px}
.z2-answer-list li{display:flex;flex-wrap:wrap;gap:4px 12px;align-items:baseline;padding:12px 16px;background:#162012;border:1px solid #3c4f2d;border-radius:12px}
.z2-answer-list strong{font-size:1.25rem;color:var(--lime);font-variant-numeric:tabular-nums;white-space:nowrap}
.z2-table-wrap{overflow-x:auto;margin:22px 0;border:1px solid #3c4933;border-radius:14px;background:#161b13}
.z2-table-wrap:focus-visible{outline:2px solid var(--lime);outline-offset:3px}
.z2-table{width:100%;border-collapse:collapse;font-size:.95rem;line-height:1.55;min-width:520px}
.z2-table caption{text-align:left;padding:14px 18px 6px;font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.z2-table th,.z2-table td{padding:12px 18px;text-align:left;vertical-align:top;border-top:1px solid #2e3828;color:#d3d8cc}
.z2-table thead th{font-size:.8rem;font-weight:500;color:#b5c3a7;border-top:0}
.z2-table tbody th{font-weight:500;color:var(--text)}
.z2-table small{display:block;font-size:.78rem;color:var(--muted);font-weight:400}
.z2-table td strong{color:var(--lime);font-size:1.05rem;font-variant-numeric:tabular-nums;white-space:nowrap}
.z2-table td{font-variant-numeric:tabular-nums}
.z2-table a{color:var(--lime)}
.z2-table-compact{min-width:360px}
.z2-formula{font-size:.9rem!important;color:var(--muted)!important}
.z2-formula code{background:#1d2519;border:1px solid #3c4933;border-radius:6px;padding:3px 8px;font-size:.85rem;color:#e3ecd8}
.z2-calc{margin:34px 0;padding:28px;background:#1d2519;border:1px solid #4d6339;border-radius:20px}
.z2-calc h2{font-size:1.45rem;line-height:1.45;margin:0 0 18px}
.z2-calc-form{display:flex;flex-wrap:wrap;gap:16px;align-items:end}
.z2-calc-form label{display:flex;flex-direction:column;gap:8px;flex:1;min-width:150px;font-size:.85rem;color:#d1ddc6}
.z2-calc-form input,.z2-calc-form select{min-height:46px;width:100%;font:inherit;font-size:16px;background:#11170f;color:#ecf0e7;border:1px solid #576b45;border-radius:8px;padding:11px}
.z2-calc-form input:focus-visible,.z2-calc-form select:focus-visible{outline:2px solid var(--lime);outline-offset:2px}
.z2-calc-output .z2-table-wrap{background:#11170f}
.z2-calc-error{color:#f1b57d!important}
.z2-age-note{margin:24px 0;padding:22px 24px;border-left:3px solid var(--lime);background:#182114;border-radius:0 14px 14px 0}
.z2-faq-item{padding:6px 0 4px;border-top:1px solid #2e3828}
.z2-faq-item:first-of-type{border-top:0}
.z2-disclaimer{margin:30px 0;padding:22px 26px;background:#221e2d;border:1px solid #51425f;border-radius:16px}
.z2-disclaimer p:last-child{margin-bottom:0;font-size:.95rem}
.z2-neighbors,.z2-age-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:30px 0}
.z2-age-links{grid-template-columns:repeat(3,minmax(0,1fr))}
.z2-neighbor{display:flex;flex-direction:column;gap:4px;min-height:44px;padding:14px 18px;border:1px solid #3c4933;border-radius:12px;text-decoration:none;color:var(--text);background:#161b13;transition:border-color .2s}
.z2-neighbor span{font-size:.75rem;color:var(--muted)}
.z2-neighbor strong{font-weight:500}
.z2-neighbor:hover,.z2-neighbor:focus-visible{border-color:var(--lime)}
.z2-neighbor-hub{text-align:center}
.z2-neighbors > :last-child:not(.z2-neighbor-hub){text-align:right}
.z2-hub{max-width:900px}
@media(max-width:700px){.z2-calc{padding:20px}.z2-calc-form label{min-width:100%}.z2-neighbors{grid-template-columns:1fr}.z2-age-links{grid-template-columns:repeat(2,minmax(0,1fr))}.z2-neighbors > *{text-align:left!important}.z2-table th,.z2-table td{padding:10px 12px}}
@media(prefers-reduced-motion:reduce){.z2-neighbor{transition:none}}
@media print{.z2-calc,.z2-neighbors{display:none!important}}