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

.calc-shell--wide {
  max-width: 760px;
}

/* ---------- Tab navigation (with chevrons between) ---------- */
.tabs {
  display: flex;
  align-items: stretch;
  background: var(--bg-subtle);
  padding: 4px;
  border: 1.5px solid var(--border-strong);
  border-radius: 10px;
  margin-bottom: 24px;
  gap: 2px;
}

.tabs button {
  flex: 1;
  min-width: 0;
  background: transparent;
  border: none;
  padding: 10px 8px;
  font-family: inherit;
  font-size: 0.92rem;
  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: 6px;
  position: relative;
}

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

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

.tabs button .tab-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--bg-subtle);
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 700;
  flex-shrink: 0;
}

.tabs button[aria-pressed="true"] .tab-num {
  background: var(--accent);
  color: var(--accent-text);
}

.tabs .tab-chevron {
  display: inline-flex;
  align-items: center;
  color: var(--text-faint);
  font-weight: 400;
  font-size: 1rem;
  pointer-events: none;
  user-select: none;
  flex-shrink: 0;
  padding: 0 2px;
}

/* ---------- Step footer (Next/Back buttons) ---------- */
.step-footer {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.step-footer .step-footer-spacer {
  flex: 1;
}

.btn-step {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  font-family: inherit;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: 8px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn-step-primary {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

.btn-step-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-step-primary:active {
  transform: translateY(1px);
}

.btn-step-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-step-secondary:hover {
  background: var(--bg-subtle);
  border-color: var(--accent);
  color: var(--accent);
}

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

.btn-step .step-arrow {
  font-weight: 400;
  font-size: 1.05em;
  line-height: 1;
}

/* ---------- Tab panel ---------- */
.tab-panel {
  display: block;
}
.tab-panel.hidden { display: none; }

/* ---------- Configure tab ---------- */
.config-group {
  margin-bottom: 22px;
}
.config-group:last-child { margin-bottom: 0; }

.config-group > label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 8px;
}

/* Stepped peptide count */
.count-control {
  display: inline-flex;
  align-items: center;
  background: var(--bg);
  border: 1.5px solid var(--border-strong);
  border-radius: 8px;
  overflow: hidden;
}

.count-control button {
  background: transparent;
  border: none;
  width: 40px;
  height: 40px;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: background-color 0.15s ease;
}

.count-control button:hover {
  background: var(--bg-subtle);
  color: var(--accent);
}

.count-control button:disabled {
  color: var(--text-faint);
  cursor: not-allowed;
}

.count-control button:disabled:hover {
  background: transparent;
}

.count-control .count-value {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  padding: 0 16px;
  border-left: 1.5px solid var(--border-strong);
  border-right: 1.5px solid var(--border-strong);
  min-width: 40px;
  text-align: center;
}

/* Container radio options */
.radio-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.radio-card {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 12px 14px;
  background: var(--bg);
  border: 1.5px solid var(--border-strong);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.radio-card:hover {
  border-color: var(--accent);
}

.radio-card.selected {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.radio-card input[type="radio"] {
  margin-top: 3px;
  accent-color: var(--accent);
  cursor: pointer;
  flex-shrink: 0;
}

.radio-card .radio-label {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 2px;
}

.radio-card .radio-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* Max BAC inline row */
.bac-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

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

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

.bac-row .bac-unit {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Checkbox styling */
.checkbox-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  cursor: pointer;
}

.checkbox-row input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

.checkbox-row label {
  font-size: 0.9rem;
  color: var(--text);
  cursor: pointer;
  margin: 0;
}

/* ---------- Peptides tab ---------- */
.peptide-row {
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 12px;
}

.peptide-row:last-child { margin-bottom: 0; }

.peptide-row__head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}

.peptide-row__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: var(--accent);
  color: var(--accent-text);
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 0.78rem;
  font-weight: 700;
  border-radius: 50%;
  flex-shrink: 0;
}

.peptide-row__title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
}

.peptide-row__fields {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}

.peptide-row__fields .field {
  margin: 0;
}

.peptide-row__fields label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.peptide-row__fields input[type="text"] {
  width: 100%;
  padding: 8px 10px;
  font-size: 0.92rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-subtle);
  border: 1.5px solid var(--border-strong);
  border-radius: 7px;
}

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

/* Dose row with mcg/mg toggle inside a peptide row */
.peptide-row__dose {
  display: flex;
  gap: 6px;
  align-items: stretch;
}

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

.peptide-row__dose .unit-toggle {
  display: inline-flex;
  background: var(--bg-subtle);
  border-radius: 7px;
  padding: 2px;
  border: 1.5px solid var(--border-strong);
  flex-shrink: 0;
}

.peptide-row__dose .unit-toggle button {
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

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

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

/* ---------- Results tab ---------- */
.results-error {
  padding: 16px 18px;
  background: var(--danger-soft);
  border: 1px solid var(--danger);
  border-left: 3px solid var(--danger);
  border-radius: 8px;
  color: var(--danger);
  font-size: 0.92rem;
  line-height: 1.5;
}

.results-error.hidden { display: none; }

.results-error strong { font-weight: 600; }

.results-summary {
  padding: 18px 22px;
  background: var(--accent-soft);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  margin-bottom: 22px;
}

.results-summary__title {
  margin: 0 0 12px;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

.results-summary__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.results-summary__stat {
  text-align: center;
}

.results-summary__big {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
  line-height: 1.1;
  margin: 0;
}

.results-summary__unit {
  font-family: 'Inter Tight', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-left: 3px;
}

.results-summary__label {
  display: block;
  margin-top: 4px;
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Warning bar with override button */
.results-warning {
  margin-bottom: 22px;
  padding: 14px 16px;
  background: var(--danger-soft);
  border: 1px solid var(--danger);
  border-left: 3px solid var(--danger);
  border-radius: 8px;
  color: var(--danger);
  font-size: 0.88rem;
  line-height: 1.5;
}

.results-warning.hidden { display: none; }

.results-warning__title {
  font-weight: 600;
  margin-bottom: 6px;
}

.results-warning__actions {
  margin-top: 10px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.results-warning__actions button {
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: 6px;
  border: 1.5px solid var(--danger);
  background: transparent;
  color: var(--danger);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.results-warning__actions button.primary {
  background: var(--danger);
  color: #fff;
}

.results-warning__actions button:hover {
  background: var(--danger);
  color: #fff;
}

.results-warning__actions button.primary:hover {
  opacity: 0.85;
}

.results-warning__actions button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(185, 28, 28, 0.25);
}

/* Instructions block */
.instructions h3 {
  margin: 22px 0 10px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.instructions h3:first-child { margin-top: 0; }

.instructions ol,
.instructions ul {
  margin: 0;
  padding-left: 22px;
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.6;
}

.instructions li {
  margin-bottom: 6px;
}

.instructions li:last-child { margin-bottom: 0; }

.instructions .mono {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.88em;
}

/* Per-dose verification table */
.dose-table-wrap {
  margin-top: 22px;
}

.dose-table-wrap h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.dose-table-wrap .dose-table-sub {
  margin: 0 0 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.dose-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  font-size: 0.88rem;
}

.dose-table th {
  text-align: left;
  padding: 10px 12px;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border);
}

.dose-table td {
  padding: 10px 12px;
  color: var(--text);
  border-bottom: 1px solid var(--border);
}

.dose-table tr:last-child td {
  border-bottom: none;
}

.dose-table td.mono {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-weight: 500;
  font-size: 0.86rem;
}

.dose-table td.match {
  color: var(--success);
}
.dose-table td.mismatch {
  color: var(--danger);
}

/* ---------- Action row (Calculate / Share) ---------- */
.action-row {
  margin-top: 22px;
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.action-row .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ---------- Share button + URL display ---------- */
.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; }
}

/* ---------- Converter card ---------- */
.converter-card {
  margin-top: 24px;
  padding: 20px 22px;
}

.converter-card h2 {
  margin: 0 0 12px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.converter-card .step__label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.converter-card .step__label:not(:first-of-type) {
  margin-top: 16px;
}

.converter-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.converter-row input[type="number"] {
  flex: 1;
  min-width: 0;
  padding: 8px 10px;
  font-size: 0.95rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1.5px solid var(--border-strong);
  border-radius: 8px;
  -moz-appearance: textfield;
}

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

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

.converter-row .equals {
  font-family: 'JetBrains Mono', ui-monospace, monospace;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 600px) {
  .calc-shell.calc-shell--wide {
    padding: 0 16px;
    margin-top: 80px;
  }
  .tabs button { font-size: 0.84rem; padding: 9px 4px; gap: 4px; }
  .tabs button .tab-num { width: 18px; height: 18px; font-size: 0.68rem; }
  .tabs .tab-chevron { padding: 0; font-size: 0.85rem; }
  .peptide-row__fields {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .results-summary__grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .results-summary__big { font-size: 1.3rem; }
  .dose-table { font-size: 0.82rem; }
  .dose-table th,
  .dose-table td { padding: 8px 10px; }
  .step-footer { gap: 8px; }
  .btn-step { padding: 9px 14px; font-size: 0.88rem; }
}

@media (max-width: 380px) {
  .tabs button .tab-num { display: none; }
  .tabs .tab-chevron { display: none; }
}

/* ============================================================
   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; }
}