.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span { display: block; width: 22px; height: 2px; background: #fff; border-radius: 2px; }

.tab-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.tab-btn {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  padding: 10px 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.tab-btn:hover { background: #F7F8FA; }
.tab-btn.active {
  background: var(--navy);
  border-color: var(--navy);
  color: #fff;
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.calc-card { padding: 28px; max-width: 640px; }
.calc-explain {
  font-size: 13px;
  color: var(--text-muted);
  background: #F7F8FA;
  border-left: 3px solid var(--orange);
  padding: 10px 14px;
  border-radius: 4px;
  margin: 0 0 22px;
}
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.calc-input { font-size: 18px; font-family: var(--mono); padding: 12px 14px; }

.calc-result {
  margin-top: 24px;
  min-height: 1px;
}
.calc-result-card {
  background: var(--navy);
  border-radius: var(--radius);
  padding: 22px 24px;
  color: #fff;
}
.calc-result-main {
  font-size: 13px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: #9aa3b5;
  font-weight: 700;
}
.calc-result-value {
  font-size: 36px;
  font-weight: 800;
  font-family: var(--mono);
  color: var(--orange);
  margin: 4px 0 16px;
}
.calc-result-sub {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  border-top: 1px solid rgba(255,255,255,0.15);
  padding-top: 14px;
}
.calc-result-sub-item { font-size: 13px; }
.calc-result-sub-item .label { color: #9aa3b5; display: block; font-size: 11px; text-transform: uppercase; letter-spacing: 0.4px; margin-bottom: 2px; }
.calc-result-sub-item .value { font-family: var(--mono); font-weight: 700; font-size: 15px; }

.calc-error {
  background: var(--red-bg);
  color: var(--red-text);
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 13.5px;
}

@media (max-width: 700px) {
  .topnav-inner { flex-wrap: wrap; }
  .nav-toggle { display: none; }
  .calc-grid { grid-template-columns: 1fr; }
  .tab-bar { gap: 6px; }
  .tab-btn { font-size: 12px; padding: 9px 12px; flex: 1 1 auto; }
}

/* ---------- Ladder tab ---------- */
.ladder-card { max-width: 760px; }
.ladder-result { margin-top: 20px; }
.ladder-tables {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.ladder-table-block h3 {
  font-size: 12.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-faint);
  margin: 0 0 8px;
}
table.ladder-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}
.ladder-table th {
  text-align: right;
  font-size: 10.5px;
  font-weight: 700;
  color: var(--text-faint);
  text-transform: uppercase;
  padding: 7px 10px;
  background: #F7F8FA;
  border-bottom: 1px solid var(--border);
}
.ladder-table th:first-child { text-align: left; }
.ladder-table td {
  padding: 7px 10px;
  font-size: 12.5px;
  text-align: right;
  font-family: var(--mono);
  border-bottom: 1px solid #F0F1F3;
}
.ladder-table td:first-child {
  text-align: left;
  font-weight: 700;
  font-family: inherit;
}
.ladder-table tr:last-child td { border-bottom: none; }
.ladder-table tr:nth-child(even) td { background: #FAFBFC; }

@media (max-width: 700px) {
  .ladder-tables { grid-template-columns: 1fr; }
}

/* ---------- Margin bands (distributor/retailer/end user) ---------- */
.band-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 12px;
  color: var(--text-muted);
}
.band-legend-note { font-size: 11px; color: var(--text-faint); font-style: italic; }

.band-pill {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 100px;
  font-size: 10.5px;
  font-weight: 700;
}
.band-pill-distributor { background: #EAF3EC; color: #1E7A4A; }
.band-pill-retailer { background: #FFF6E0; color: #92660C; }
.band-pill-end_user { background: #EEF1F8; color: var(--navy-light); }

tr.band-distributor td { background: #F7FBF8; }
tr.band-retailer td { background: #FFFDF5; }
tr.band-end_user td { background: #F8F9FC; }
tr.band-distributor:nth-child(even) td { background: #EFF7F1; }
tr.band-retailer:nth-child(even) td { background: #FFF9E8; }
tr.band-end_user:nth-child(even) td { background: #F1F3F9; }