/* ==========================================================================
   Unit conversion calculators - shared styles
   Requires /assets/css/modern-tool-cards.css (tokens + .cat-* accents).
   Wrap the tool in:  <div class="uc cat-calc"> ... </div>
   ========================================================================== */

.uc-panel {
  background: var(--tc-bg); border: 1px solid var(--tc-border); border-radius: 20px;
  box-shadow: var(--tc-shadow); overflow: hidden;
}
.uc-panel__head {
  display: flex; align-items: center; gap: .6rem; padding: .9rem 1.25rem;
  background: var(--tc-surface); border-bottom: 1px solid var(--tc-border);
}
.uc-panel__head h3 { margin: 0; font-size: .8rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--tc-muted); }
.uc-panel__head i { color: var(--accent); font-size: 1.1rem; }

.uc-grid {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem 1.5rem;
  padding: clamp(1rem, 3vw, 1.5rem);
}
.uc-field { display: grid; gap: .4rem; min-width: 0; }
.uc-field > label { font-size: .9rem; font-weight: 600; color: var(--tc-text); }

.uc-box {
  display: flex; align-items: stretch; min-width: 0;
  background: var(--tc-bg); border: 1px solid var(--tc-border); border-radius: 12px; overflow: hidden;
  transition: border-color .2s var(--tc-ease), box-shadow .2s var(--tc-ease);
}
.uc-box:focus-within { border-color: var(--accent); box-shadow: 0 0 0 4px rgba(var(--accent-rgb), .18); }
.uc-box:has(.is-invalid) { border-color: #dc2626; box-shadow: 0 0 0 4px rgba(220, 38, 38, .12); }
.uc-box input {
  flex: 1 1 auto; min-width: 0; padding: .75rem .9rem; font: inherit; font-size: 1rem; color: var(--tc-text);
  background: transparent; border: 0; outline: 0; font-variant-numeric: tabular-nums;
}
.uc-unit {
  display: grid; place-items: center; min-width: 3.2rem; padding: 0 .7rem; font-size: .8rem; font-weight: 600;
  color: var(--tc-muted); background: var(--tc-surface); border-left: 1px solid var(--tc-border); white-space: nowrap;
}
.uc-copy {
  display: grid; place-items: center; width: 2.9rem; font-size: 1.1rem; color: var(--tc-muted);
  background: var(--tc-surface); border: 0; border-left: 1px solid var(--tc-border); cursor: pointer;
  transition: color .2s var(--tc-ease), background .2s var(--tc-ease);
}
.uc-copy:hover { color: var(--accent); background: rgba(var(--accent-rgb), .10); }
.uc-copy:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.uc-copy .ph-check { color: #16a34a; }

.uc-options {
  display: flex; flex-wrap: wrap; align-items: center; gap: .75rem 1.25rem; padding: 1rem clamp(1rem, 3vw, 1.5rem);
  border-top: 1px solid var(--tc-border); background: var(--tc-surface);
}
.uc-options label { display: inline-flex; align-items: center; gap: .6rem; font-size: .9rem; font-weight: 600; color: var(--tc-text); }
.uc-options select {
  padding: .5rem .7rem; font: inherit; font-size: .9rem; color: var(--tc-text);
  background: var(--tc-bg); border: 1px solid var(--tc-border); border-radius: 10px;
}
.uc-options select:focus { outline: 0; border-color: var(--accent); box-shadow: 0 0 0 4px rgba(var(--accent-rgb), .18); }
.uc-btn {
  display: inline-flex; align-items: center; gap: .45rem; margin-left: auto; padding: .55rem .9rem; font: inherit; font-size: .88rem; font-weight: 600;
  color: var(--tc-text); background: var(--tc-bg); border: 1px solid var(--tc-border); border-radius: 12px; cursor: pointer;
  transition: border-color .2s var(--tc-ease), color .2s var(--tc-ease);
}
.uc-btn:hover { border-color: var(--accent); color: var(--accent); }
.uc-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.uc-status { flex-basis: 100%; margin: 0; min-height: 1.1em; font-size: .82rem; color: #dc2626; }
.uc-status:empty { display: none; }
.uc-note { padding: 0 clamp(1rem, 3vw, 1.5rem) 1rem; margin: 0; font-size: .78rem; color: var(--tc-muted); background: var(--tc-surface); }
.uc-note i { margin-right: .3rem; color: var(--accent); }

/* reference table */
.uc-tablewrap { overflow-x: auto; border: 1px solid var(--tc-border); border-radius: 14px; }
.uc-table { width: 100%; margin: 0; border-collapse: collapse; font-size: .9rem; }
.uc-table th, .uc-table td { padding: .7rem 1rem; text-align: left; border-bottom: 1px solid var(--tc-border); }
.uc-table thead th { font-size: .78rem; letter-spacing: .05em; text-transform: uppercase; color: var(--tc-muted); background: var(--tc-surface); }
.uc-table tbody tr:last-child td { border-bottom: 0; }
.uc-table tbody tr:nth-child(even) { background: var(--tc-surface); }
.uc-table code { padding: .1rem .4rem; font-size: .85em; color: var(--tc-text); background: rgba(var(--accent-rgb), .10); border-radius: 6px; white-space: nowrap; }

@media (max-width: 700px) { .uc-grid { grid-template-columns: 1fr; } .uc-btn { margin-left: 0; } }