/* ============================================================
   Proportion Calculator — บัญญัติไตรยางค์ + ปรับสัดส่วนสูตร
   ============================================================ */

.site-header {
  padding: 24px 0 12px;
  text-align: center;
}

.header-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
}

.logo {
  font-size: 1.5rem;
  margin: 0;
  color: var(--text-primary);
  font-weight: 700;
}

.main {
  max-width: 760px;
  margin: 0 auto;
  padding: 16px 16px 48px;
}

.lead {
  color: var(--text-secondary);
  text-align: center;
  margin: 0 0 20px;
  line-height: 1.55;
}

/* ── Mode tabs ──────────────────────────────────────────── */
.mode-tabs {
  display: flex;
  gap: 6px;
  padding: 4px;
  background: var(--navy-800);
  border: 1px solid var(--navy-600);
  border-radius: 14px;
  margin-bottom: 20px;
}

.mode-tab {
  flex: 1;
  padding: 10px 14px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.92rem;
  font-family: inherit;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}

.mode-tab:hover {
  color: var(--text-primary);
}

.mode-tab.is-active {
  background: linear-gradient(135deg, var(--blue-600), var(--blue-500));
  color: #fff;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35);
}

/* ── Panels ─────────────────────────────────────────────── */
.panels {
  position: relative;
}

.calc-panel {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid var(--navy-600);
  border-radius: 16px;
  padding: 22px;
  display: none;
}

.calc-panel.is-visible {
  display: block;
}

.panel-title {
  margin: 0 0 6px;
  font-size: 1.05rem;
  color: var(--text-primary);
}

.panel-hint {
  margin: 0 0 18px;
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Rule-of-three grid ─────────────────────────────────── */
.rule-grid {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  margin: 8px 0 12px;
}

.rule-row {
  display: flex;
  align-items: end;
  gap: 12px;
  width: 100%;
  max-width: 460px;
}

.rule-cell {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rule-lbl {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  text-align: center;
}

.rule-cell input {
  width: 100%;
  padding: 14px 12px;
  border: 1px solid var(--navy-600);
  border-radius: 10px;
  background: var(--navy-800);
  color: var(--text-primary);
  font-family: "JetBrains Mono", monospace;
  font-size: 1.15rem;
  font-weight: 600;
  text-align: center;
}

.rule-cell input.is-solved {
  background: rgba(59, 130, 246, 0.16);
  border-color: var(--blue-400);
  color: var(--blue-200, #bfdbfe);
}

.rule-cell input:focus {
  outline: none;
  border-color: var(--blue-400);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.rule-op {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-muted);
  padding-bottom: 14px;
}

.rule-equals {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--blue-400);
  margin: 2px 0;
}

.rule-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 14px 0 12px;
  min-height: 22px;
}

.rule-status {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: right;
}

.rule-status.is-warn {
  color: #fbbf24;
}

.rule-result-box,
.result-box {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  border: 1px solid var(--blue-400);
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.12), rgba(59, 130, 246, 0.03));
}

.result-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.result-value {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--text-primary);
  word-break: break-all;
  text-align: right;
}

.rule-formula {
  margin: 10px 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  font-family: "JetBrains Mono", monospace;
  min-height: 18px;
}

/* ── Recipe scaler ──────────────────────────────────────── */
.scale-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr 90px;
  gap: 10px;
  align-items: end;
  margin-bottom: 12px;
}

@media (max-width: 540px) {
  .scale-row {
    grid-template-columns: 1fr 1fr;
  }
  .scale-arrow {
    display: none;
  }
  .field--unit {
    grid-column: 1 / -1;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field span {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
}

.field input {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--navy-600);
  border-radius: 10px;
  background: var(--navy-800);
  color: var(--text-primary);
  font-family: "JetBrains Mono", monospace;
  font-size: 1rem;
  font-weight: 600;
}

.field input:focus {
  outline: none;
  border-color: var(--blue-400);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.scale-arrow {
  font-size: 1.4rem;
  color: var(--text-muted);
  padding-bottom: 12px;
}

.factor-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(59, 130, 246, 0.15);
  color: var(--blue-300);
  font-family: "JetBrains Mono", monospace;
  font-weight: 700;
  font-size: 0.9rem;
  min-height: 30px;
  margin-bottom: 16px;
  border: 1px solid rgba(59, 130, 246, 0.4);
  visibility: hidden;
}

.factor-badge.is-shown {
  visibility: visible;
}

.factor-badge.is-down {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border-color: rgba(245, 158, 11, 0.4);
}

/* ── Ingredients ────────────────────────────────────────── */
.ingredients-card {
  border: 1px solid var(--navy-600);
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.4);
  overflow: hidden;
}

.ing-head,
.ing-row {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr) minmax(0, 1fr) 36px;
  gap: 8px;
  padding: 10px 12px;
  align-items: center;
}

.ing-head {
  background: rgba(30, 41, 59, 0.6);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.ing-list .ing-row + .ing-row {
  border-top: 1px solid var(--navy-700);
}

.ing-name,
.ing-amt {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--navy-600);
  border-radius: 8px;
  background: var(--navy-800);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.92rem;
}

.ing-amt {
  font-family: "JetBrains Mono", monospace;
  text-align: right;
}

.ing-name:focus,
.ing-amt:focus {
  outline: none;
  border-color: var(--blue-400);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.25);
}

.ing-out {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.96rem;
  font-weight: 700;
  color: var(--blue-300);
  text-align: right;
  padding: 0 10px;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ing-out.is-empty {
  color: var(--text-muted);
  font-weight: 500;
}

.ing-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 1px solid var(--navy-600);
  border-radius: 8px;
  background: var(--navy-700);
  color: var(--text-secondary);
  font-size: 1.05rem;
  cursor: pointer;
}

.ing-remove:hover {
  border-color: #ef4444;
  color: #fecaca;
}

.ing-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding: 12px;
  background: rgba(30, 41, 59, 0.35);
  border-top: 1px solid var(--navy-700);
}

/* ── Buttons ────────────────────────────────────────────── */
.btn-secondary,
.btn-text {
  font-family: inherit;
  cursor: pointer;
}

.btn-secondary {
  padding: 8px 16px;
  border-radius: 10px;
  border: 1px solid var(--navy-600);
  background: var(--navy-700);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.9rem;
}

.btn-secondary:hover {
  border-color: var(--blue-400);
}

.btn-text {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 6px 8px;
  border-radius: 6px;
}

.btn-text:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

/* ── Recipe presets ─────────────────────────────────────── */
.recipe-quick {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--navy-700);
}

.recipe-quick-lbl {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-right: 4px;
}

.chip {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--navy-600);
  background: rgba(30, 41, 59, 0.6);
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.chip:hover {
  border-color: var(--blue-400);
  color: var(--blue-300);
  background: rgba(59, 130, 246, 0.1);
}

/* ── SEO copy / FAQ ─────────────────────────────────────── */
.seo-copy {
  margin: 32px 0 16px;
  padding: 18px 20px;
  background: rgba(15, 23, 42, 0.4);
  border: 1px solid var(--navy-700);
  border-radius: 12px;
}

.seo-copy h2 {
  font-size: 1rem;
  margin: 0 0 8px;
  color: var(--text-primary);
}

.seo-copy p {
  margin: 0 0 8px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.faq-section {
  margin-top: 24px;
}

.faq-title {
  font-size: 1.05rem;
  margin: 0 0 12px;
  color: var(--text-primary);
}

.faq-item {
  border: 1px solid var(--navy-700);
  border-radius: 10px;
  margin-bottom: 8px;
  background: rgba(15, 23, 42, 0.4);
  overflow: hidden;
}

.faq-q {
  padding: 12px 14px;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
}

.faq-q::-webkit-details-marker {
  display: none;
}

.faq-q::before {
  content: "+";
  display: inline-block;
  width: 18px;
  color: var(--blue-400);
  font-weight: 700;
}

.faq-item[open] .faq-q::before {
  content: "−";
}

.faq-a {
  padding: 0 14px 14px 32px;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.site-footer {
  text-align: center;
  padding: 16px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.ad-slot--top {
  max-width: 760px;
  margin: 0 auto;
  padding: 8px 16px;
}

.skip-link {
  position: absolute;
  left: -10000px;
}
.skip-link:focus {
  left: 16px;
  top: 16px;
  z-index: 999;
  background: var(--blue-500);
  color: #fff;
  padding: 8px 12px;
  border-radius: 8px;
}