/* K4Converter: area calculators (square footage + sq ft to sq m). Uses the site's design tokens; works in light and dark. */
.area-calc{display:flex;flex-direction:column;gap:18px}

/* unit chips */
.area-units{border:0;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.area-units legend{float:left;margin:0 6px 0 0;padding:0;font-weight:700;font-size:.9rem;color:var(--ink-2);line-height:38px}
.chip-radio{position:relative;cursor:pointer}
.chip-radio input{position:absolute;opacity:0;inset:0;width:100%;height:100%;margin:0;cursor:pointer}
.chip-radio span{display:inline-flex;align-items:center;min-height:38px;padding:0 14px;border-radius:var(--pill);border:1.5px solid var(--border);background:var(--card);font-weight:700;font-size:.88rem;color:var(--ink-2);transition:all .2s var(--ease)}
.chip-radio input:checked+span{background:var(--ink);border-color:var(--ink);color:var(--bg)}
.chip-radio input:focus-visible+span{outline:2px solid var(--orange);outline-offset:2px}

/* shape tabs */
.area-tabs{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;-webkit-overflow-scrolling:touch;scrollbar-width:thin}
.area-tabs [role="tab"]{flex:none;min-height:44px;padding:0 18px;border-radius:var(--pill);border:1.5px solid var(--border);background:var(--card);font:inherit;font-weight:700;font-size:.92rem;color:var(--ink-2);cursor:pointer;transition:all .2s var(--ease)}
.area-tabs [role="tab"][aria-selected="true"]{background:var(--ink);border-color:var(--ink);color:var(--bg);box-shadow:3px 3px 0 var(--orange)}
.area-tabs [role="tab"]:focus-visible{outline:2px solid var(--orange);outline-offset:2px}

/* inputs */
.area-dims{display:grid;gap:14px;grid-template-columns:repeat(2,minmax(0,1fr))}
.area-dims.dims-1{grid-template-columns:minmax(0,1fr)}
.area-dims.dims-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.area-dims .calc-input,.area-opts .calc-input,.area-linkbox .calc-input{font-size:16px;min-height:48px}
.unit-tag{font-weight:600;color:var(--muted)}
.swap-mark{align-self:end;padding-bottom:14px;color:var(--muted);font-weight:700}

/* result */
.area-result{display:flex;flex-direction:column;gap:6px;min-height:84px;justify-content:center}
.area-big{display:flex;flex-wrap:wrap;align-items:baseline;gap:2px 10px;font-size:clamp(1.9rem,6vw,2.6rem);line-height:1.15;font-weight:800;letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.area-big strong{overflow-wrap:anywhere}
.area-calc .quick button{min-height:44px}
.area-big strong{color:var(--orange-600)}
.area-big span{font-size:.5em;font-weight:700;color:var(--muted);letter-spacing:0}
.area-formula{font-size:.92rem;color:var(--muted);font-variant-numeric:tabular-nums}
.area-line{font-size:.98rem;color:var(--ink-2)}
.area-line strong{color:var(--ink)}
.area-conv{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.area-conv[hidden],.area-project[hidden],.area-linkbox[hidden]{display:none}
.area-conv>div{padding:12px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--card);font-size:.8rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;text-align:center}
.area-conv>div span{display:block;margin-bottom:2px;font-size:1.15rem;font-weight:800;letter-spacing:0;text-transform:none;color:var(--ink);font-variant-numeric:tabular-nums}

/* options */
.area-opts{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--card);padding:0 16px}
.area-opts summary{cursor:pointer;min-height:48px;display:flex;align-items:center;font-weight:700;color:var(--ink-2)}
.area-opts summary:focus-visible{outline:2px solid var(--orange);outline-offset:2px;border-radius:6px}
.area-opts-grid{display:grid;gap:14px;grid-template-columns:repeat(2,minmax(0,1fr));padding-bottom:16px}
.area-opts .quick{margin-top:8px}

/* multi-room project */
.area-project{border:1.5px dashed var(--border-strong);border-radius:var(--radius-sm);padding:16px;background:var(--orange-50)}
.area-project-title{margin:0 0 10px;font-size:1.05rem}
.area-rooms{list-style:none;margin:0 0 12px;padding:0;display:flex;flex-direction:column;gap:8px}
.area-rooms li{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 12px;border-radius:10px;background:var(--card);border:1px solid var(--border);font-size:.95rem}
.room-x{min-height:44px;min-width:44px;padding:0 10px;border:0;background:none;color:var(--orange-700);font:inherit;font-weight:700;font-size:.85rem;cursor:pointer;text-decoration:underline}
.room-x:focus-visible{outline:2px solid var(--orange);outline-offset:2px;border-radius:6px}

/* actions + link box */
.area-actions{flex-wrap:wrap;gap:10px}
.area-actions .btn{min-height:44px}
.area-linkbox{display:flex;flex-direction:column;gap:6px}
.area-linkbox label{font-weight:700;font-size:.85rem;color:var(--muted)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

@media (max-width:560px){
  .area-dims,.area-dims.dims-3,.area-opts-grid{grid-template-columns:minmax(0,1fr)}
  .area-dims.dims-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .area-conv{gap:8px}
  .area-conv>div{padding:10px 6px}
  .area-conv>div span{font-size:1rem}
  .area-units legend{float:none;width:100%;line-height:1.4}
}
@media (prefers-reduced-motion:reduce){.chip-radio span,.area-tabs [role="tab"]{transition:none}}