h1 {
  margin-top: 32px;
  margin-bottom: 8px;
  font-size: 2rem;
}

.lede {
  color: var(--muted);
  margin-top: 0;
  margin-bottom: 28px;
  max-width: 60ch;
}

.tool {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}

.tool__inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 12px;
}

.input-group__title {
  font-size: 1rem;
  margin: 0 0 12px;
}

label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  display: block;
  margin-bottom: 6px;
}

input[type="number"] {
  width: 100%;
  font: inherit;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg);
  color: var(--ink);
  margin-bottom: 14px;
  box-sizing: border-box;
}

.hint {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 16px;
  max-width: 60ch;
}

.tool__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 10px;
}

.action-btn {
  font: inherit;
  font-weight: 600;
  padding: 8px 16px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-ink);
  cursor: pointer;
}

.action-btn:hover { filter: brightness(1.08); }

.action-btn--secondary {
  background: var(--bg);
  color: var(--ink);
  border-color: var(--line);
}

.status {
  margin: 0 0 6px;
  font-size: 0.9rem;
  font-weight: 600;
  min-height: 1.3em;
}

.status--ok { color: #1e8e3e; }
.status--error { color: #c0392b; }

.results {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.solution {
  border-top: 1px solid var(--line);
  padding-top: 20px;
}

.solution__label {
  font-size: 1.1rem;
  margin: 0 0 12px;
}

.solution__body {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  align-items: start;
}

.triangle-diagram {
  width: 100%;
  height: auto;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.triangle-diagram__shape {
  fill: rgba(47, 111, 237, 0.08);
  stroke: var(--accent);
  stroke-width: 2;
}

.triangle-diagram__vertex {
  font-size: 13px;
  font-weight: 700;
  fill: var(--ink);
  text-anchor: middle;
  dominant-baseline: middle;
}

.triangle-diagram__side {
  font-size: 11px;
  fill: var(--muted);
  text-anchor: middle;
}

.solution__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 20px;
}

.stat-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 6px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.9rem;
}

.stat-row__label { color: var(--muted); }
.stat-row__value { font-weight: 600; }

.faq { margin-top: 48px; max-width: 70ch; }

.faq h2 { font-size: 1.3rem; margin-top: 32px; }

details {
  border-bottom: 1px solid var(--line);
  padding: 12px 0;
}

details summary {
  cursor: pointer;
  font-weight: 600;
}

@media (max-width: 640px) {
  .tool__inputs { grid-template-columns: 1fr; gap: 8px; }
  .solution__body { grid-template-columns: 1fr; }
  .solution__stats { grid-template-columns: 1fr; }
}