:root {
  --solution-ink: #173a36;
  --solution-muted: #55716d;
  --solution-border: #c9ded9;
  --solution-panel: #f8fcfb;
  --solution-accent: #177b68;
  --solution-accent-dark: #0e594d;
  --solution-soft: #e8f5f1;
  --solution-warm: #f2f7df;
  --solution-radius: 14px;
}
* { box-sizing: border-box; }
body { color: var(--solution-ink); }
.calculator-panel, .result-panel { background: var(--solution-panel); border: 1px solid var(--solution-border); border-radius: var(--solution-radius); padding: clamp(18px, 3vw, 30px); margin-block: 1rem; }
.calculator-panel h2, .result-panel h2 { margin-top: 0; }
.field-group { margin-block: 1rem; }
.field-group label { display: block; font-weight: 700; margin-bottom: .4rem; }
input, select, button { font: inherit; }
input, select { width: 100%; min-height: 44px; border: 1px solid #93b8b0; border-radius: 9px; padding: .55rem .7rem; color: var(--solution-ink); background: #fff; }
input:focus-visible, select:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid #e1a72b; outline-offset: 2px; }
input[aria-invalid="true"], select[aria-invalid="true"] { border-color: #b54235; box-shadow: 0 0 0 2px #f5d5d0; }
.help-text { color: var(--solution-muted); font-size: .92rem; margin: .35rem 0 0; }
.input-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.unit-input { display: grid; grid-template-columns: minmax(0, 1fr) minmax(110px, .42fr); gap: .5rem; }
.actions, .animation-controls { display: flex; flex-wrap: wrap; gap: .65rem; margin-top: 1.25rem; }
.button { border: 1px solid #82aca3; border-radius: 999px; background: #fff; color: var(--solution-accent-dark); padding: .62rem 1rem; cursor: pointer; min-height: 42px; }
.button:hover:not(:disabled) { background: var(--solution-soft); }
.button:disabled { cursor: not-allowed; opacity: .52; }
.button-primary { background: var(--solution-accent); border-color: var(--solution-accent); color: #fff; }
.button-primary:hover:not(:disabled) { background: var(--solution-accent-dark); }
.form-error { color: #9d3025; min-height: 1.5em; margin: 1rem 0 0; }
.section-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 1rem; flex-wrap: wrap; }
.status { color: var(--solution-muted); margin: 0; }
.result-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .75rem; margin-block: 1.2rem; }
.metric { border: 1px solid var(--solution-border); background: #fff; border-radius: 10px; padding: .75rem; min-width: 0; }
.metric-wide { grid-column: span 2; }
.metric-label { display: block; color: var(--solution-muted); font-size: .9rem; margin-bottom: .25rem; }
.metric strong { display: block; overflow-wrap: anywhere; font-size: clamp(1rem, 2vw, 1.22rem); }
.canvas-wrap { width: 100%; margin-top: 1rem; overflow: visible; }
#conversion-canvas { display: block; width: 100%; height: auto; border: 1px solid var(--solution-border); border-radius: 12px; background: linear-gradient(180deg, #fbfffd, #eef8f3); }
.canvas-note { color: var(--solution-muted); font-size: .92rem; margin: .75rem 0; }
.canvas-scale-legend { color: var(--solution-muted); font-size: .92rem; margin: .45rem 0 .75rem; }
.sync-frame { border-left: 4px solid var(--solution-accent); background: var(--solution-soft); padding: .75rem 1rem; line-height: 1.6; min-height: 3.2rem; }
.sync-frame .frame-line { display: block; }
.element-table { overflow-x: auto; }
.elements-grid { width: 100%; border-collapse: collapse; font-size: .94rem; }
.elements-grid th, .elements-grid td { padding: .55rem .6rem; border-bottom: 1px solid var(--solution-border); text-align: left; }
.elements-grid th { color: var(--solution-accent-dark); background: #eef8f4; }
.elements-grid td:nth-child(n+2) { text-align: right; font-variant-numeric: tabular-nums; }
.element-table table { width: 100%; border-collapse: collapse; background: #fff; }
.element-table th, .element-table td { padding: .55rem; border-bottom: 1px solid var(--solution-border); text-align: left; white-space: nowrap; }
.details { margin-top: 1.35rem; }
.details h3 { margin-bottom: .6rem; }
@media (max-width: 720px) {.input-grid { grid-template-columns: 1fr; gap: .25rem; }
  .result-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .metric-wide { grid-column: span 2; }
}
@media (max-width: 430px) {.calculator-panel, .result-panel { padding: 16px; }
  .unit-input { grid-template-columns: minmax(0, 1fr) 92px; }
  .actions, .animation-controls { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .button { width: 100%; padding-inline: .55rem; }
}