:root{
  --bg:#f9f6f7; --card:#fff; --border:#e7dfe1;
  --muted:#6b7280; --text:#101418;
  --brand:#7A1E1E; --brand-600:#5f1818;
  --badge:#7A1E1E; --badge-text:#fff;
  --result-bg:#fbf7f7; --shadow:0 6px 24px rgba(0,0,0,.08);
  --radius:12px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial;color:var(--text);background:var(--bg);line-height:1.45}

sub{font-size:0.72em;line-height:0;vertical-align:sub} /* ensure real subscripts */

.container{max-width:1024px;margin:24px auto;padding:20px}
.header h1{margin:.2em 0 .1em;font-size:1.6rem}
.subhead{margin:0;color:var(--muted)}

.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;margin-top:16px;box-shadow:var(--shadow)}
.card-title{margin:.1em 0 12px;font-size:1.25rem}

.row{display:flex;gap:12px;align-items:center;margin:10px 0;position:relative}
.label{min-width:220px;font-weight:600;display:inline-flex;align-items:center;gap:.4rem;position:relative}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(360px,1fr));gap:14px;margin:6px 0 10px}

/* Inputs */
select,input{padding:10px 12px;font-size:15px;border:1px solid #c9d2cf;border-radius:10px;width:100%;background:#fff}
select:focus,input:focus,.info-btn:focus{outline:3px solid #e4b6b6;outline-offset:2px}

/* Inline range helper (keeps “30 to 90 psi” horizontal) */
.field-with-range{display:flex;align-items:center;gap:10px;width:100%}
.range-inline{color:var(--muted);white-space:nowrap}

/* Buttons */
.primary{margin-top:6px;padding:12px 16px;border:0;border-radius:10px;background:var(--brand);color:#fff;font-weight:700;cursor:pointer}
.primary:hover{background:var(--brand-600)}

/* Simple list layout (Droplet/Flow sections) */
.list{display:flex;flex-direction:column;gap:4px;background:var(--result-bg);border:1px solid #f0dfe1;padding:12px;border-radius:10px}
.list-tight .list-row{padding:2px 0}
.list-row{
  display:grid;
  grid-template-columns: 1fr auto auto auto; /* label, ":", value, badge */
  align-items:center; column-gap:8px;
}
.list-label{font-weight:600;display:flex;align-items:center;gap:.4rem;position:relative}
.list-sep{color:var(--muted)}
.list-value b{font-variant-numeric:tabular-nums}
.list-badge{display:flex;justify-content:flex-start}
.badge{background:var(--badge);color:var(--badge-text);border-radius:16px;padding:2px 8px;font-size:12px;font-weight:700}

/* Info buttons + tooltips */
.info-btn{
  display:inline-flex;align-items:center;justify-content:center;
  width:1.4rem;height:1.4rem;border-radius:999px;border:1px solid #c08c8c;
  background:#f7eaea;color:var(--brand);font-weight:700;line-height:1;cursor:pointer
}
.tooltip{
  position:absolute;left:0;top:100%;margin-top:6px;background:#fff;color:#1f2937;
  border:1px solid #e1d0d3;border-radius:8px;padding:10px 12px;font-size:.92rem;
  width:min(320px,90vw);z-index:20;box-shadow:0 8px 20px rgba(0,0,0,.12);
  display:none;
}
.tooltip:before{
  content:"";position:absolute;top:-6px;left:14px;width:10px;height:10px;background:#fff;
  border-left:1px solid #e1d0d3;border-top:1px solid #e1d0d3;transform:rotate(45deg)
}
.info-btn:hover + .tooltip,
.info-btn:focus + .tooltip,
.tooltip[aria-hidden="false"]{display:block}

/* Inline list rows: label, value, badge grouped together on the left */
.list-row-inline{
  display:flex; align-items:center; gap:10px;
  padding:4px 6px;
}
.list-row-inline .list-label{
  min-width: 210px; /* keeps labels aligned but close */
  font-weight:600; display:inline-flex; align-items:center; gap:.4rem; position:relative;
}
.list-row-inline .list-num{font-variant-numeric:tabular-nums}
.list-row-inline .unit{color:var(--muted)}

/* Slightly reduce gaps inside the Droplet list */
.list-tight{gap:2px}

/* Ensure <sub> always looks like a true subscript across browsers */
sub{font-size:0.72em; line-height:0; vertical-align:sub}

/* Footer */
.footer{color:#6b7280;margin-top:18px;font-size:13px}