/**
 * USI Materials Calculator — CalculatorSoup-style I/O (v1.0.4).
 * Horizontal label | input | unit rows; Clear + Calculate; bordered Answer box.
 */

.usi-mc {
  --usi-mc-ink: #1a1a1a;
  --usi-mc-muted: #5c5c5c;
  --usi-mc-line: #bdbdbd;
  --usi-mc-bg: #f3f3f3;
  --usi-mc-card: #f7f7f7;
  --usi-mc-accent: #2c4a3e;
  --usi-mc-accent-2: #3d6b57;
  --usi-mc-bar: #8b3a2a;
  --usi-mc-err: #9b1c1c;
  --usi-mc-radius: 4px;
  --usi-mc-shadow: 0 1px 2px rgba(0,0,0,.06);
  color: var(--usi-mc-ink);
  font-family: "Open Sans", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.45;
  max-width: 720px;
  margin: 0 auto 2.5rem;
  padding: 0 1rem;
}

.usi-mc *,
.usi-mc *::before,
.usi-mc *::after { box-sizing: border-box; }

.usi-mc-header {
  background: #fff;
  border: 1px solid var(--usi-mc-line);
  border-radius: var(--usi-mc-radius);
  box-shadow: var(--usi-mc-shadow);
  padding: 1.1rem 1.2rem;
  margin: 1rem 0 1rem;
}

.usi-mc-header-text { margin-bottom: .5rem; }

.usi-mc-title {
  margin: 0 0 .3rem;
  font-size: 1.55rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--usi-mc-accent);
}

.usi-mc-subtitle {
  margin: 0 0 .65rem;
  color: var(--usi-mc-muted);
  font-size: .92rem;
}

.usi-mc-disclaimer {
  margin: 0;
  padding: .6rem .75rem;
  background: #fff8e8;
  border-left: 3px solid #c4922a;
  color: #5a4208;
  font-size: .85rem;
}

.usi-mc-disclaimer--banner { margin-top: .45rem; }

/* Tabs */
.usi-mc-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin: 0 0 .85rem;
  border-bottom: 2px solid var(--usi-mc-line);
  padding-bottom: .35rem;
}

.usi-mc-tab,
.usi-mc-subtab,
.usi-mc-btn {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  font: inherit;
  cursor: pointer;
  border-radius: 4px;
}

.usi-mc-tab {
  padding: .5rem .9rem;
  font-weight: 700;
  color: var(--usi-mc-muted);
}

.usi-mc-tab.is-active,
.usi-mc-tab[aria-selected="true"] {
  background: var(--usi-mc-accent);
  color: #fff;
}

/* Soup panel: light gray bordered calculator */
.usi-mc-panel {
  background: var(--usi-mc-card);
  border: 1px solid #888;
  border-radius: var(--usi-mc-radius);
  padding: 0 0 1rem;
  box-shadow: var(--usi-mc-shadow);
  overflow: hidden;
}

.usi-mc-subtabs {
  display: flex;
  flex-wrap: wrap;
  gap: .3rem;
  margin: 0;
  padding: .65rem .85rem .55rem;
  background: #eee;
  border-bottom: 1px solid var(--usi-mc-line);
}

.usi-mc-subtab {
  padding: .35rem .65rem;
  border: 1px solid var(--usi-mc-line);
  background: #fff;
  font-size: .82rem;
  font-weight: 600;
  color: var(--usi-mc-muted);
}

.usi-mc-subtab.is-active {
  background: var(--usi-mc-accent);
  border-color: var(--usi-mc-accent);
  color: #fff;
}

.usi-mc-module {
  padding: .85rem 1rem 0;
}

.usi-mc-module h2 {
  margin: 0 0 .85rem;
  padding: .45rem .7rem;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  background: var(--usi-mc-bar);
  border-radius: 2px;
}


/* ——— Units legend (collapsible, all tabs) ——— */
.usi-mc-uom {
  background: #fff;
  border: 1px solid var(--usi-mc-line);
  border-radius: var(--usi-mc-radius);
  margin: 0 0 1rem;
  padding: .55rem .9rem .7rem;
  font-size: .85rem;
}
.usi-mc-uom > summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--usi-mc-accent);
  list-style-position: outside;
  padding: .15rem 0;
}
.usi-mc-uom > summary:focus-visible {
  outline: 2px solid var(--usi-mc-accent-2);
  outline-offset: 2px;
}
.usi-mc-uom-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .25rem .85rem;
  margin: .55rem 0 0;
  padding: 0;
}
.usi-mc-uom-grid > div {
  display: grid;
  grid-template-columns: minmax(4.5rem, auto) 1fr;
  gap: .2rem .45rem;
  align-items: baseline;
  margin: 0;
}
.usi-mc-uom-grid dt {
  margin: 0;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--usi-mc-ink);
}
.usi-mc-uom-grid dd {
  margin: 0;
  color: var(--usi-mc-muted);
}
@media (max-width: 520px) {
  .usi-mc-uom-grid {
    grid-template-columns: 1fr;
  }
}

.usi-mc-hint {
  margin: .55rem 0 0;
  font-size: .82rem;
  color: var(--usi-mc-muted);
}

/* ——— Soup form rows: label | input | unit ——— */
.usi-mc-form {
  display: flex;
  flex-direction: column;
  gap: .55rem;
  max-width: 420px;
}

.usi-mc-field {
  display: grid;
  grid-template-columns: minmax(7.5rem, 38%) 1fr;
  align-items: center;
  gap: .45rem .65rem;
  font-size: .9rem;
  font-weight: 500;
  color: var(--usi-mc-ink);
}

.usi-mc-field > label {
  text-align: right;
  font-size: .9rem;
  font-weight: 500;
  color: var(--usi-mc-ink);
  line-height: 1.2;
}

/* Soup-style "Label =" only on measurement / unit fields */
.usi-mc-field--with-unit > label::after,
.usi-mc-field--inline > label::after {
  content: " =";
  font-weight: 500;
}

label.usi-mc-check::after {
  content: none !important;
}

.usi-mc-input-row {
  display: flex;
  align-items: stretch;
  gap: .35rem;
  min-width: 0;
}

.usi-mc-input-row input {
  flex: 1 1 auto;
  min-width: 0;
  max-width: 7.5rem;
  width: 100%;
}

.usi-mc-unit-select {
  flex: 0 0 auto;
  width: auto;
  min-width: 3.6rem;
  max-width: 5.25rem;
  padding: .35rem .3rem !important;
  font-size: .85rem !important;
  font-weight: 500 !important;
  background: #fff !important;
  cursor: pointer;
}

.usi-mc-field input,
.usi-mc-field select,
.usi-mc-field textarea {
  font: inherit;
  font-weight: 500;
  color: var(--usi-mc-ink);
  border: 1px solid #999;
  border-radius: 2px;
  padding: .35rem .45rem;
  background: #fff;
  min-height: 32px;
  width: 100%;
}

.usi-mc-field > select {
  max-width: 100%;
}

.usi-mc-field input:focus,
.usi-mc-field select:focus {
  outline: 2px solid rgba(44, 74, 62, .35);
  border-color: var(--usi-mc-accent);
}

.usi-mc-check {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: .5rem;
  grid-template-columns: 1fr;
  font-weight: 500;
  color: var(--usi-mc-ink);
  max-width: 420px;
}

.usi-mc-check input { width: auto; min-height: auto; max-width: none; }

/* Safety % inline above concrete modules */
.usi-mc-field--inline {
  display: grid;
  grid-template-columns: minmax(7.5rem, 38%) auto;
  align-items: center;
  gap: .45rem .65rem;
  margin: .65rem 1rem .35rem;
  max-width: 420px;
  font-size: .9rem;
  font-weight: 500;
}

.usi-mc-field--inline > label::after { content: " ="; }
.usi-mc-field--inline input { max-width: 5rem; min-height: 32px; }

/* Clear (left) + Calculate (right) — Soup button row */
.usi-mc-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin: 1rem 0 .75rem;
  max-width: 420px;
}

.usi-mc-actions--soup {
  justify-content: space-between;
  align-items: center;
}

.usi-mc-btn {
  padding: .4rem .95rem;
  border: 1px solid #888;
  background: #fff;
  font-weight: 600;
  color: var(--usi-mc-ink);
  border-radius: 3px;
  min-width: 5.5rem;
}

.usi-mc-btn:hover { border-color: var(--usi-mc-accent-2); background: #fafafa; }

.usi-mc-btn--primary {
  background: #fff;
  border-color: #666;
  color: var(--usi-mc-ink);
  font-weight: 700;
}

.usi-mc-btn--primary:hover { background: #f0f0f0; }

/* ——— Answer box (Soup) ——— */
.usi-mc-results {
  margin: .35rem 0 0;
  padding: 0;
  max-width: 420px;
  background: transparent;
  border: none;
}

.usi-mc-answer {
  margin: 0 0 .65rem;
  padding: .75rem .9rem .9rem;
  background: #fff;
  border: 2px solid #222;
  border-radius: 2px;
}

.usi-mc-answer-heading {
  font-weight: 700;
  font-size: 1rem;
  margin: 0 0 .65rem;
  color: var(--usi-mc-ink);
}

.usi-mc-answer-line {
  display: block;
  padding: .45rem 0;
  font-size: 1.05rem;
  line-height: 1.35;
}

.usi-mc-answer-label {
  font-weight: 700;
  color: var(--usi-mc-ink);
}

.usi-mc-answer-value {
  font-weight: 400;
  color: #333;
  font-variant-numeric: tabular-nums;
}

.usi-mc-result-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: .35rem;
  margin: 0 0 .5rem;
  padding: .65rem .75rem;
  background: #fff;
  border: 1px solid var(--usi-mc-line);
  border-radius: 2px;
}

.usi-mc-result-list--secondary {
  background: #fafafa;
}

.usi-mc-result-list > div {
  display: grid;
  grid-template-columns: minmax(120px, 40%) 1fr;
  gap: .4rem;
  padding: .2rem 0;
  border-bottom: 1px solid rgba(0,0,0,.06);
}

.usi-mc-result-list dt {
  margin: 0;
  font-weight: 600;
  color: var(--usi-mc-muted);
  font-size: .82rem;
}

.usi-mc-result-list dd {
  margin: 0;
  font-weight: 500;
  font-size: .9rem;
}

.usi-mc-error {
  color: var(--usi-mc-err);
  font-weight: 600;
  padding: .65rem .75rem;
  background: #fff;
  border: 2px solid var(--usi-mc-err);
  border-radius: 2px;
}

.usi-mc-toast {
  position: fixed;
  left: 50%;
  bottom: 1.25rem;
  transform: translateX(-50%);
  background: var(--usi-mc-ink);
  color: #fff;
  padding: .65rem 1rem;
  border-radius: 6px;
  font-size: .9rem;
  z-index: 99999;
  box-shadow: 0 4px 16px rgba(0,0,0,.2);
  max-width: min(90vw, 420px);
}

.usi-mc-gate {
  padding: 1.5rem;
  background: var(--usi-mc-bg);
  border-radius: var(--usi-mc-radius);
  text-align: center;
}

@media (max-width: 768px) {
  .usi-mc { padding: 0 .65rem; font-size: 14px; max-width: 100%; }
  .usi-mc-title { font-size: 1.3rem; }
  .usi-mc-tabs { gap: .25rem; }
  .usi-mc-tab {
    flex: 1 1 calc(33% - .25rem);
    text-align: center;
    padding: .55rem .3rem;
    font-size: .82rem;
  }
  .usi-mc-field {
    grid-template-columns: minmax(5.5rem, 34%) 1fr;
  }
  .usi-mc-field > label { font-size: .85rem; }
  .usi-mc-form,
  .usi-mc-actions,
  .usi-mc-results,
  .usi-mc-check,
  .usi-mc-field--inline { max-width: 100%; }
  .usi-mc-input-row input { max-width: none; }
  .usi-mc-result-list > div { grid-template-columns: 1fr; gap: .1rem; }
  .usi-mc-answer-line { font-size: 1rem; }
}