/* ============================================================
   CalcVerse Calculator Components
   ============================================================ */

/* ── Calculator card wrapper ── */
.calculator-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-6);
}

@media (min-width: 768px) { .calculator-card { padding: var(--space-6); } }

.calculator-card__heading {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-purple-950);
  margin-bottom: var(--space-6);
}

/* ── Input group ── */
.input-group { margin-bottom: var(--space-4); }

.input-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-purple-700);
  margin-bottom: var(--space-2);
}

.input-field {
  width: 100%;
  height: 56px;
  font-size: 36px;
  font-weight: 800;
  font-family: var(--font-ui);
  color: var(--color-gray-900);
  background: var(--color-gray-100);
  border: 1.5px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  transition: border-color var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
  -webkit-appearance: none;
  appearance: none;
}

.input-field::placeholder {
  color: var(--color-gray-400);
  font-weight: 400;
  font-size: 20px;
}

.input-field:focus {
  outline: none;
  background: var(--color-white);
  border-color: var(--color-purple-700);
  border-width: 2px;
  box-shadow: var(--shadow-focus);
}

@media (max-width: 767px) {
  .input-field { height: 52px; font-size: 32px; }
}

/* ── Input grid — 2 col on tablet+ ── */
.input-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

@media (min-width: 768px) {
  .input-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ── Unit selector tabs (kg/lbs/stone, cm/ft/in) ── */
.unit-tabs {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
}

.unit-tab {
  flex: 1;
  height: 44px;
  font-size: 13px;
  font-weight: 500;
  font-family: var(--font-ui);
  color: var(--color-gray-700);
  background: var(--color-gray-100);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
}

.unit-tab:hover { background: var(--color-purple-50); border-color: var(--color-purple-200); }

.unit-tab.active {
  background: var(--color-purple-700);
  color: var(--color-white);
  font-weight: 700;
  border-color: var(--color-purple-700);
}

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

/* ── Calculate button row ── */
.calc-actions {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

@media (max-width: 479px) {
  .calc-actions { flex-direction: column; }
  .calc-actions .btn-primary,
  .calc-actions .btn-secondary { width: 100%; }
}

/* ── Result display ── */
.result-card {
  background: var(--color-white);
  border: 1px solid var(--color-purple-200);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
  text-align: center;
}

.result-label {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-purple-600);
  margin-bottom: var(--space-2);
}

.result-number {
  font-family: var(--font-mono);
  font-size: 48px;
  font-weight: 800;
  color: var(--color-gray-900);
  line-height: 1;
  margin-bottom: var(--space-3);
}

@media (max-width: 767px) {
  .result-number { font-size: 36px; }
}

.result-sub {
  font-size: 16px;
  color: var(--color-gray-500);
  margin-bottom: var(--space-3);
}

.result-badge {
  display: inline-flex;
  align-items: center;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  min-height: 24px;
}

.result-badge--success { background: var(--color-success-bg); color: var(--color-success-text); }
.result-badge--warning { background: var(--color-warning-bg); color: var(--color-warning-text); }
.result-badge--danger  { background: var(--color-danger-bg);  color: var(--color-danger-text);  }
.result-badge--neutral { background: var(--color-gray-100);   color: var(--color-gray-700);     }
.result-badge--info    { background: var(--color-info-bg);    color: var(--color-info-text);    }

/* ── Slider ── */
.slider-group { margin-bottom: var(--space-4); }

.slider-value-display {
  font-size: 20px;
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--color-gray-200);
  border-radius: 3px;
  outline: none;
  padding: 0;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-purple-700);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
  border: none;
}

input[type="range"]::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-purple-700);
  cursor: pointer;
  border: none;
}

@media (min-width: 768px) {
  input[type="range"]::-webkit-slider-thumb { width: 20px; height: 20px; }
  input[type="range"]::-moz-range-thumb { width: 20px; height: 20px; }
}

input[type="range"]:focus-visible { box-shadow: var(--shadow-focus); }

/* ── AI assistant section ── */
.ai-section {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
}

.ai-section h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
}

.ai-input-row {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.ai-input-row .input-field {
  flex: 1;
  height: 48px;
  font-size: 16px;
  font-weight: 400;
}

.ai-input-row .input-field::placeholder {
  font-size: 15px;
}

.ai-input-row .btn-primary {
  flex-shrink: 0;
  width: auto;
}

.ai-response {
  background: var(--color-info-bg);
  color: var(--color-info-text);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  font-size: 15px;
  line-height: 1.7;
  display: none;
}

.ai-response.visible { display: block; }

.ai-loading {
  display: none;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-gray-500);
  font-size: 14px;
  padding: var(--space-2) 0;
}

.ai-loading.visible { display: flex; }

@media (max-width: 479px) {
  .ai-input-row { flex-direction: column; }
  .ai-input-row .btn-primary { width: 100%; }
}