:root{
  --bg:#f3f1ec;
  --card:#ffffff;
  --ink:#1f252a;
  --muted:#6a737b;
  --line:#d8d4cb;
  --accent:#40586a;
  --accent-soft:#e8eef2;
  --same:#eef0f1;
  --small:#fff4cf;
  --medium:#fbe2bd;
  --large:#f4c6c1;
}
*{box-sizing:border-box}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
button,select,input{font:inherit}
.app-shell{max-width:1100px;margin:0 auto;padding:28px 20px 48px}
.app-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  margin-bottom:22px;
}
.app-header h1{
  margin:0;
  font-family:Georgia,"Times New Roman",serif;
  font-size:clamp(30px,5vw,46px);
  font-weight:500;
}
.unit-toggle{
  display:inline-flex;
  padding:3px;
  border:1px solid var(--line);
  border-radius:999px;
  background:#fff;
  flex-shrink:0;
}
.unit-toggle button{
  border:0;background:transparent;color:var(--muted);
  padding:7px 14px;border-radius:999px;cursor:pointer;
}
.unit-toggle button.active{background:var(--accent);color:#fff}
.selector-grid{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  gap:14px;
  align-items:center;
}
.selector-card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:14px;
  box-shadow:0 8px 24px rgba(35,42,46,.05);
  padding:15px;
}
.selector-heading{
  margin-bottom:11px;
  color:var(--muted);
  font-size:12px;
  font-weight:700;
  letter-spacing:.08em;
  text-transform:uppercase;
}
.selector-fields{display:grid;grid-template-columns:1fr 1fr;gap:10px}
label{color:var(--muted);font-size:12px}
select{
  display:block;
  width:100%;
  margin-top:6px;
  padding:11px 12px;
  border:1px solid var(--line);
  border-radius:9px;
  background:#fff;
  color:var(--ink);
}
.swap-btn{
  width:44px;height:44px;border:1px solid var(--line);
  border-radius:50%;background:#fff;cursor:pointer;font-size:19px;
}
.toolbar{
  display:flex;
  justify-content:flex-start;
  align-items:center;
  gap:12px;
  margin:15px 0 8px;
}
.compare-switch{
  display:flex;align-items:center;gap:9px;
  color:var(--ink);font-size:14px;font-weight:600;
}
.compare-switch input{width:18px;height:18px}
.context-header{
  margin:18px 0 10px;
}
.context-title{
  font-size:24px;
  font-weight:700;
  letter-spacing:-.01em;
}
.tabs{
  position:relative;
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  margin-bottom:12px;
  border-bottom:1px solid var(--line);
}
.tab{
  border:0;
  background:transparent;
  color:var(--muted);
  padding:12px 8px 13px;
  cursor:pointer;
  font-weight:700;
}
.tab.active{color:var(--ink)}
.tab-underline{
  position:absolute;
  left:0;
  bottom:-1px;
  height:3px;
  width:25%;
  background:var(--accent);
  border-radius:3px 3px 0 0;
  transition:transform .2s ease;
}
.content-panel{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:14px;
  box-shadow:0 8px 24px rgba(35,42,46,.05);
  overflow:hidden;
}

/* Single-size stacked layout */
.single-list{padding:0 22px}
.single-row{
  padding:18px 2px 17px;
  border-bottom:1px solid var(--line);
}
.single-row:last-child{border-bottom:0}
.single-name{
  color:var(--muted);
  font-size:13px;
  font-weight:700;
  margin-bottom:5px;
}
.single-value{
  font-size:22px;
  font-weight:700;
  letter-spacing:-.01em;
}

/* Compare table */
.measurement-table{width:100%;border-collapse:collapse}
.measurement-table th,.measurement-table td{
  padding:13px 15px;
  border-bottom:1px solid var(--line);
  text-align:right;
}
.measurement-table th:first-child,.measurement-table td:first-child{text-align:left}
.measurement-table thead th{
  background:var(--accent-soft);
  color:#4c5c67;
  font-size:12px;
  letter-spacing:.05em;
  text-transform:uppercase;
}
.measurement-table tbody tr:last-child td{border-bottom:0}
.measurement-name{font-weight:700}
.diff-pill{
  display:inline-block;
  min-width:74px;
  padding:5px 9px;
  border-radius:999px;
  font-weight:700;
  text-align:center;
}
.diff-same{background:var(--same)}
.diff-small{background:var(--small)}
.diff-medium{background:var(--medium)}
.diff-large{background:var(--large)}
.blank{color:#a2a7ab}
.notes-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;padding:16px}
.note-card{
  border:1px solid var(--line);
  border-radius:12px;
  padding:15px;
  background:#fff;
}
.note-card h2{margin:0 0 10px;font-size:18px}
.note-card ul{margin:0;padding-left:20px;color:#4f5961;line-height:1.5}
body:not(.compare-mode) .compare-only{display:none}
.empty-state{padding:28px;text-align:center;color:var(--muted)}

@media(max-width:720px){
  .app-shell{padding:18px 12px 34px}
  .app-header{align-items:flex-start}
  .app-header h1{font-size:32px;line-height:1.08}
  .selector-grid{grid-template-columns:1fr}
  .selector-fields{grid-template-columns:1fr 1fr}
  .swap-btn{justify-self:center}
  .context-title{font-size:21px}
  .tabs{
    position:sticky;
    top:0;
    z-index:9;
    background:var(--bg);
  }
  .tab{font-size:13px;padding:11px 4px 12px}
  .content-panel{
    background:#fff;
    border-radius:12px;
  }
  .single-list{padding:0 16px}
  .single-row{padding:16px 0 15px}
  .single-value{font-size:21px}
  .measurement-table,.measurement-table thead,.measurement-table tbody,
  .measurement-table tr,.measurement-table th,.measurement-table td{display:block;width:100%}
  .measurement-table thead{display:none}
  .measurement-table tbody{display:grid;gap:9px;padding:0}
  .measurement-table tr{
    background:#fff;border-bottom:1px solid var(--line);
    padding:13px 16px;
  }
  .measurement-table tr:last-child{border-bottom:0}
  .measurement-table td{border:0;padding:4px 0;text-align:left!important}
  .measurement-table td:not(:first-child)::before{
    display:inline-block;min-width:88px;margin-right:6px;
    color:var(--muted);font-size:11px;font-weight:700;text-transform:uppercase;
  }
  .measurement-table td:nth-child(2)::before{content:"A"}
  .measurement-table td:nth-child(3)::before{content:"B"}
  .measurement-table td:nth-child(4)::before{content:"Difference"}
  .notes-grid{grid-template-columns:1fr;padding:12px}
}
@media(max-width:420px){
  .selector-fields{grid-template-columns:1fr}
}