/* ── Page layout ──────────────────────────────────────────────────────────── */
.converter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 1100px;
  margin: 24px auto 0;
  padding: 0 8px 40px;
}

.section.fuel-full {
  grid-column: 1 / -1;
}

@media (max-width: 720px) {
  .converter-grid {
    grid-template-columns: 1fr;
    max-width: 480px;
  }
}

/* ── Section body ─────────────────────────────────────────────────────────── */
.section-body {
  padding: 4px 18px 18px;
}

/* ── Converter row ────────────────────────────────────────────────────────── */
.converter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 20px;
}

/* ── Individual field ─────────────────────────────────────────────────────── */
.conv-field {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex: 1 1 120px;
  min-width: 100px;
}

.conv-field label {
  font-size: 0.68rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
}

.conv-field input {
  padding: 10px 12px;
  background: var(--bg-input-alt);
  border: 1px solid var(--border-input);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s;
  width: 100%;
  box-sizing: border-box;
}

.conv-field input:focus {
  border-color: var(--text-accent);
}

.conv-field input::placeholder {
  color: var(--text-placeholder);
}

/* Hide number spinners */
.conv-field input::-webkit-outer-spin-button,
.conv-field input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.conv-field input[type=number] {
  -moz-appearance: textfield;
}

.unit-symbol {
  font-size: 0.72rem;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* ── Mach altitude row ────────────────────────────────────────────────────── */
.mach-alt-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.mach-alt-row label {
  font-size: 0.68rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
}

.mach-alt-row input {
  padding: 6px 10px;
  background: var(--bg-input-alt);
  border: 1px solid var(--border-input);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 0.85rem;
  outline: none;
  transition: border-color 0.2s;
  width: 110px;
  box-sizing: border-box;
}

.mach-alt-row input:focus {
  border-color: var(--text-accent);
}

.mach-alt-row input::-webkit-outer-spin-button,
.mach-alt-row input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.mach-alt-row input[type=number] {
  -moz-appearance: textfield;
}

.mach-note {
  font-size: 0.68rem;
  color: var(--text-hint);
  letter-spacing: 0.5px;
  margin-left: auto;
  font-style: italic;
}

/* ── Fuel sub-section ─────────────────────────────────────────────────────── */
.fuel-divider {
  border: none;
  border-top: 1px solid rgba(126, 184, 247, 0.1);
  margin: 18px 0;
}

.sub-label {
  font-size: 0.72rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted-dim);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

/* ── Fuel type toggle ─────────────────────────────────────────────────────── */
.fuel-toggle-wrap {
  display: flex;
  gap: 6px;
}

.fuel-toggle {
  padding: 4px 14px;
  background: var(--bg-input-alt);
  border: 1px solid var(--border-input);
  border-radius: 14px;
  color: var(--text-muted);
  font-size: 0.72rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}

.fuel-toggle.active {
  background: var(--btn-active-bg);
  border-color: var(--text-accent);
  color: var(--text-accent);
}

.fuel-toggle:hover:not(.active) {
  background: var(--btn-hover-subtle);
  border-color: var(--btn-hover-border);
}