/* Board Beaver material calculators — shared by every /<material>-calculator
   page. Pairs with theme.css; self-contained + same-origin for the strict CSP. */

.calc-app { max-width: 760px; margin: 1.4rem auto; padding: 0 clamp(1rem, 4vw, 1.5rem) 3rem; }
.calc-intro { color: var(--muted); max-width: 62ch; margin: 0.2rem 0 1.4rem; }

.calc-panel {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 1.1rem clamp(1rem, 3vw, 1.4rem) 1.3rem; margin-bottom: 1.3rem;
}

.calc-fields { display: flex; flex-wrap: wrap; gap: 0.9rem 1.2rem; align-items: end; }
.field { display: flex; flex-direction: column; gap: 0.3rem; font-size: 0.8rem; font-weight: 600; color: var(--text); }
.field input, .field select {
  font: inherit; font-size: 0.95rem; color: var(--text); width: 8.5rem;
  padding: 0.5rem 0.6rem; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface);
}
.field input:focus, .field select:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px var(--ring); }
.field span[data-u] { color: var(--muted); font-weight: 500; font-style: normal; }

.result-panel h2 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); margin: 0 0 0.8rem; }
.stat-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 0.8rem; }
.stat { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.8rem 0.95rem; }
.stat .k { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); }
.stat .v { font-size: 1.7rem; font-weight: 800; letter-spacing: -0.02em; }

.calc-note { color: var(--muted); font-size: 0.85rem; margin-top: 0.9rem; }