/* ============================================================
   Intranasal — calculator-specific styles
   Depends on shared.css for theme tokens and base components
   ============================================================ */

.calc-shell--wide {
  max-width: 680px;
}

/* ---------- Mode toggle (Vial / Powder) ---------- */
.mode-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  background: var(--bg-subtle);
  padding: 4px;
  border: 1.5px solid var(--border-strong);
  border-radius: 10px;
  margin-bottom: 24px;
}

.mode-toggle button {
  background: transparent;
  border: none;
  padding: 10px 14px;
  font-family: inherit;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 7px;
  transition: background-color 0.15s ease, color 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.mode-toggle button[aria-pressed="true"] {
  background: var(--bg-elevated);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.mode-toggle button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.mode-toggle button svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

/* ---------- Mode panels ---------- */
.mode-panel {
  display: block;
}
.mode-panel.hidden { display: none; }

/* ---------- Dose row (input + unit toggle) ---------- */
.dose-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.dose-row input[type="text"] {
  flex: 1;
  min-width: 0;
}

.unit-toggle {
  display: inline-flex;
  background: var(--bg-subtle);
  border-radius: 8px;
  padding: 3px;
  border: 1.5px solid var(--border-strong);
  flex-shrink: 0;
}

.unit-toggle button {
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 6px 14px;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.unit-toggle button[aria-pressed="true"] {
  background: var(--bg-elevated);
  color: var(--accent);
  box-shadow: var(--shadow-sm);
}

.unit-toggle button:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

/* ---------- Result panel (two-stat layout) ---------- */
.calc-result {
  margin-top: 28px;
  padding: 22px;
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
}

.calc-result__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.calc-result__stat {
  text-align: center;
}

.calc-result__stat + .calc-result__stat {
  border-left: 1px solid var(--border);
  padding-left: 18px;
}

.calc-result__label {
  margin: 0 0 6px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.calc-result__big {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 1.85rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
  line-height: 1.1;
  margin: 0;
}

.calc-result__unit {
  font-family: 'Inter Tight', sans-serif;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 4px;
  letter-spacing: 0;
}

.calc-result__warning {
  display: none;
  margin: 16px 0 0;
  padding: 10px 12px;
  background: var(--danger-soft);
  border-left: 3px solid var(--danger);
  border-radius: 6px;
  color: var(--danger);
  font-size: 0.85rem;
  font-weight: 500;
}

.calc-result__warning.visible { display: block; }

/* ---------- Info card ---------- */
.info-card {
  margin-top: 18px;
  padding: 18px 22px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.info-card p { margin: 0; }
.info-card p + p { margin-top: 8px; }
.info-card strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- Share ---------- */
.share-actions {
  margin-top: 18px;
  display: flex;
  justify-content: center;
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: inherit;
  color: var(--accent);
  background: transparent;
  border: 1.5px solid var(--accent);
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.share-btn:hover {
  background: var(--accent);
  color: var(--accent-text);
}

.share-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.share-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.share-btn svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.share-url-wrapper {
  margin-top: 12px;
  padding: 12px 14px;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  position: relative;
  word-break: break-all;
}

.share-url-wrapper.hidden { display: none; }

.share-url-wrapper .share-url-text {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.82rem;
  color: var(--accent);
  display: block;
  padding-right: 60px;
}

.share-url-wrapper .copy-confirmation {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--success);
  opacity: 0;
  pointer-events: none;
}

.share-url-wrapper .copy-confirmation.show {
  animation: copy-fade 1.6s ease-in-out;
}

@keyframes copy-fade {
  0% { opacity: 0; }
  15% { opacity: 1; }
  85% { opacity: 1; }
  100% { opacity: 0; }
}

/* ---------- Helper card (Spray Volume Helper) ---------- */
.helper-card {
  margin-top: 24px;
  padding: 20px 22px;
}

.helper-card h2 {
  margin: 0 0 4px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.helper-card .helper-sub {
  margin: 0 0 14px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.helper-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  align-items: end;
}

.helper-row .field {
  margin: 0;
}

.helper-row label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.helper-row input[type="text"] {
  width: 100%;
  padding: 9px 11px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1.5px solid var(--border-strong);
  border-radius: 8px;
}

.helper-row input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--focus-ring);
}

.helper-result {
  margin-top: 14px;
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.helper-result.empty {
  color: var(--text-faint);
}

.helper-result .helper-result-val {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent);
  margin: 0 4px;
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .calc-shell.calc-shell--wide {
    padding: 0 16px;
    margin-top: 80px;
  }
  .mode-toggle button { font-size: 0.88rem; padding: 9px 8px; }
  .calc-result__big { font-size: 1.45rem; }
  .calc-result__unit { font-size: 0.9rem; }
  .calc-result__stats { gap: 12px; }
  .calc-result__stat + .calc-result__stat { padding-left: 12px; }
  .helper-row { grid-template-columns: 1fr; gap: 10px; }
}

@media (max-width: 380px) {
  /* On very narrow screens, stack the two stats vertically */
  .calc-result__stats {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .calc-result__stat + .calc-result__stat {
    border-left: none;
    border-top: 1px solid var(--border);
    padding-left: 0;
    padding-top: 14px;
  }
}

/* ============================================================
   Below-tool reference section (on-page SEO)
   ============================================================ */
.section-divider {
  max-width: 720px;
  margin: 56px auto 0;
  border: 0;
  border-top: 1px solid var(--border);
}

.reference {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 22px 8px;
  color: var(--text-muted);
  line-height: 1.6;
  font-size: 0.95rem;
}

.reference h2 {
  margin: 0 0 10px;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

.reference h3 {
  margin: 24px 0 6px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.reference p { margin: 0 0 12px; }

.reference strong { color: var(--text); font-weight: 600; }

.reference a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}

.reference a:hover { border-bottom-color: var(--accent); }

.reference .ref-formula {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  overflow-x: auto;
}

.reference .ref-disclaimer {
  font-size: 0.85rem;
  border-left: 3px solid var(--border-strong);
  padding-left: 14px;
}

.reference .related-tools {
  list-style: none;
  padding: 0;
  margin: 0 0 12px;
}

.reference .related-tools li { margin: 0 0 8px; }

.footer-disclaimer {
  max-width: 720px;
  margin: 0 auto 10px;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

@media (max-width: 600px) {
  .reference { padding: 28px 16px 8px; }
  .section-divider { margin-top: 40px; }
}