/* Tribology: its own styles, on the family tokens (site.css) and the bench
   layer (bench.css). Light and dark come from the tokens; green, amber and
   red ranges use the status tokens (--ok, --warn, --bad). */

/* ---------- Tabs ---------- */

.trib-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 1.75rem;
  border-bottom: 1px solid var(--glass-line);
  overflow-x: auto;
}
.trib-tab {
  margin-bottom: -1px;
  padding: 0.65rem 1.1rem;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--ink-muted);
  font: 500 0.88rem/1.2 var(--font);
  white-space: nowrap;
  cursor: pointer;
}
.trib-tab:hover {
  color: var(--ink);
}
.trib-tab.active {
  border-bottom-color: var(--accent);
  color: var(--ink);
}
.tab-panel {
  display: none;
}
.tab-panel.active {
  display: block;
}

/* ---------- Reference tables ---------- */

.sub-title {
  margin-bottom: 0.4rem;
  color: var(--ink);
  font: 800 1.05rem/1.25 var(--font-display);
}
.sub-title-spaced {
  margin-top: 2rem;
}
.sub-note {
  max-width: 70ch;
  margin-bottom: 1rem;
  color: var(--ink-muted);
  font-size: 0.85rem;
  line-height: 1.6;
}
.table-wrap {
  margin-bottom: 1.5rem;
  overflow-x: auto;
  border: 1px solid var(--glass-line);
  border-radius: var(--r-sm);
  background: var(--surface);
}
.table-wrap table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.table-wrap thead th {
  padding: 0.6rem 0.85rem;
  border-bottom: 1px solid var(--glass-line);
  background: var(--surface-sunk);
  color: var(--ink-muted);
  font: 500 0.75rem/1.3 var(--font-mono);
  text-align: left;
  white-space: nowrap;
}
.table-wrap tbody tr {
  border-bottom: 1px solid var(--glass-line);
}
.table-wrap tbody tr:last-child {
  border-bottom: none;
}
.table-wrap tbody tr:hover {
  background: var(--accent-soft);
}
.table-wrap tbody td {
  padding: 0.6rem 0.85rem;
  color: var(--ink-muted);
  line-height: 1.5;
  vertical-align: top;
}
.table-wrap tbody td.val {
  color: var(--ink);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.table-wrap tbody td.hi {
  color: var(--accent-ink);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.table-wrap tbody td.muted {
  font-size: 0.8rem;
}

/* A friction range, tinted by how slippery it is. */
.mu-range {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border: 1px solid var(--accent);
  border-radius: 5px;
  background: var(--accent-soft);
  color: var(--ink);
  font: 600 0.8rem/1.4 var(--font-mono);
  white-space: nowrap;
}
.mu-range.green {
  border-color: var(--ok);
  background: var(--ok-soft);
  color: var(--ok);
}
.mu-range.yellow {
  border-color: var(--warn);
  background: var(--warn-soft);
  color: var(--warn);
}
.mu-range.red {
  border-color: var(--bad);
  background: var(--bad-soft);
  color: var(--bad);
}

/* ---------- Calculators ---------- */

.tab-two-col {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 18rem;
  gap: 1.75rem;
  align-items: start;
}
@media (max-width: 54rem) {
  .tab-two-col {
    grid-template-columns: minmax(0, 1fr);
  }
}
.calc-card {
  max-width: 44rem;
  border: 1px solid var(--glass-line);
  border-radius: var(--r-md);
  background: var(--surface);
  overflow: hidden;
}
.calc-card-header {
  padding: 1.1rem 1.4rem 1rem;
  border-bottom: 1px solid var(--glass-line);
}
.calc-card-header h2 {
  margin-bottom: 0.2rem;
  color: var(--ink);
  font: 800 1.1rem/1.2 var(--font-display);
}
.calc-card-header p {
  color: var(--ink-muted);
  font-size: 0.85rem;
  line-height: 1.5;
}
.calc-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.25rem 1.4rem;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.field-row,
.field-row-3 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}
.field-row-3 {
  grid-template-columns: 1fr 1fr 1fr;
}
@media (max-width: 35rem) {
  .field-row,
  .field-row-3 {
    grid-template-columns: 1fr;
  }
}
.group-label {
  margin-top: 0.25rem;
}
.field input,
.field select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-sm);
  background: var(--surface);
  color: var(--ink);
  font: 400 0.95rem/1.3 var(--font-mono);
  -moz-appearance: textfield;
  transition: border-color 0.15s var(--ease), box-shadow 0.15s var(--ease);
}
.field input::-webkit-inner-spin-button,
.field input::-webkit-outer-spin-button {
  -webkit-appearance: none;
}
.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.field select {
  appearance: none;
  padding-right: 2rem;
  background:
    linear-gradient(45deg, transparent 50%, var(--ink-muted) 50%) right 0.95rem center / 5px 5px no-repeat,
    linear-gradient(-45deg, transparent 50%, var(--ink-muted) 50%) right 0.65rem center / 5px 5px no-repeat,
    var(--surface);
  font-family: var(--font);
  cursor: pointer;
}
.calc-divider {
  height: 1px;
  margin: 0 -1.4rem;
  background: var(--glass-line);
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}
.results-grid-spaced {
  margin-bottom: 0.9rem;
}
@media (max-width: 30rem) {
  .results-grid {
    grid-template-columns: 1fr;
  }
}
.result-box {
  padding: 0.85rem 1rem;
  border-radius: var(--r-sm);
  background: var(--surface-sunk);
}
.result-box.primary {
  background: var(--accent-soft);
}
.result-label {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--ink-muted);
  font: 500 0.72rem/1.3 var(--font-mono);
}
.result-val {
  color: var(--accent-ink);
  font: 500 1.35rem/1.1 var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.result-val .unit {
  margin-left: 4px;
  color: var(--ink-muted);
  font-size: 0.75rem;
}
.result-box.primary .result-val {
  color: var(--ink);
}
.result-note {
  margin-top: 0.3rem;
  color: var(--ink-muted);
  font-size: 0.75rem;
  line-height: 1.4;
}
.error-msg {
  display: none;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--bad);
  border-radius: var(--r-sm);
  background: var(--bad-soft);
  color: var(--bad);
  font-size: 0.85rem;
}
.error-msg.show {
  display: block;
}
.btn-row {
  display: flex;
  gap: 0.5rem;
}
.btn-reset {
  padding: 0.45rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: transparent;
  color: var(--ink-muted);
  font: 600 0.82rem/1 var(--font);
  cursor: pointer;
}
.btn-reset:hover {
  border-color: var(--accent);
  color: var(--ink);
}
.formula-block {
  padding: 0.8rem 1rem;
  border-radius: var(--r-sm);
  background: var(--surface-sunk);
  color: var(--ink);
  font: 400 0.82rem/1.85 var(--font-mono);
  white-space: pre;
  overflow-x: auto;
}

/* ---------- Lubrication regime ---------- */

.lambda-regime {
  display: none;
  margin-top: 0.25rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--glass-line);
  border-radius: var(--r-sm);
  background: var(--surface-sunk);
}
.lambda-regime.show {
  display: block;
}
.lambda-regime-label {
  margin-bottom: 0.35rem;
  color: var(--ink-muted);
  font: 500 0.72rem/1.3 var(--font-mono);
}
.lambda-regime-name {
  margin-bottom: 0.25rem;
  font: 800 1.2rem/1.2 var(--font-display);
}
.lambda-regime-desc {
  color: var(--ink-muted);
  font-size: 0.88rem;
  line-height: 1.55;
}
.regime-boundary {
  border-color: var(--bad);
  background: var(--bad-soft);
}
.regime-boundary .lambda-regime-name {
  color: var(--bad);
}
.regime-mixed {
  border-color: var(--warn);
  background: var(--warn-soft);
}
.regime-mixed .lambda-regime-name {
  color: var(--warn);
}
.regime-full {
  border-color: var(--ok);
  background: var(--ok-soft);
}
.regime-full .lambda-regime-name {
  color: var(--ok);
}

/* ---------- Sidebars ---------- */

.sidebar-card {
  position: sticky;
  top: 6rem;
  padding: 1.25rem;
  border: 1px solid var(--glass-line);
  border-radius: var(--r-md);
  background: var(--surface);
}
@media (max-width: 54rem) {
  .sidebar-card {
    position: static;
  }
}
.sidebar-card .bench-kicker {
  margin-bottom: 0.75rem;
}
.sidebar-card p {
  color: var(--ink-muted);
  font-size: 0.82rem;
  line-height: 1.65;
}
.sidebar-card p.sidebar-lead {
  margin-bottom: 0.75rem;
}
.sidebar-card .table-wrap {
  margin: 0;
}
.sidebar-card table {
  font-size: 0.8rem;
}
.preset-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 0.75rem;
}
.preset-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid var(--glass-line);
  border-radius: var(--r-sm);
  background: var(--surface-sunk);
  font-size: 0.8rem;
  cursor: pointer;
}
.preset-row:hover {
  border-color: var(--accent);
}
.preset-name {
  color: var(--ink-muted);
}
.preset-val {
  color: var(--accent-ink);
  font: 600 0.78rem/1.3 var(--font-mono);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}