/* ── Cost Calculator ── */

.calc {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}
@media (max-width: 900px) {
  .calc { grid-template-columns: 1fr; }
}

/* Left panel: inputs */
.calc__inputs {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.calc__group {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}
.calc__group-title {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-accent);
  margin-bottom: var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.calc__group-title svg {
  opacity: 0.7;
}

/* Model selector */
.calc__models {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}
@media (max-width: 480px) {
  .calc__models { grid-template-columns: 1fr; }
}
.calc__model {
  position: relative;
  cursor: pointer;
}
.calc__model input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}
.calc__model-label {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
  font-size: var(--text-sm);
}
.calc__model-label:hover {
  border-color: var(--color-accent-200);
}
.calc__model input:checked + .calc__model-label {
  border-color: var(--color-accent);
  background: var(--color-accent-50);
  box-shadow: 0 0 0 1px var(--color-accent);
}
.calc__model-name {
  font-weight: 600;
  color: var(--color-text);
}
.calc__model-price {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* Slider fields */
.calc__field {
  margin-top: var(--space-4);
}
.calc__field:first-child {
  margin-top: 0;
}
.calc__label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}
.calc__value {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-accent);
  font-size: var(--text-sm);
}

/* Range slider styling */
.calc__range {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--color-border);
  outline: none;
  transition: background var(--duration-fast);
}
.calc__range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(249, 115, 22, 0.3);
  transition: transform var(--duration-fast) var(--ease-out);
}
.calc__range::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}
.calc__range::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-accent);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 2px 8px rgba(249, 115, 22, 0.3);
}

/* Toggle switches */
.calc__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) 0;
  cursor: pointer;
  user-select: none;
}
.calc__toggle + .calc__toggle {
  border-top: 1px solid var(--color-border-subtle);
}
.calc__toggle-text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}
.calc__toggle-text strong {
  display: block;
  color: var(--color-text);
  font-weight: 600;
}
.calc__switch {
  position: relative;
  width: 44px;
  height: 24px;
  flex-shrink: 0;
}
.calc__switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.calc__switch-track {
  position: absolute;
  inset: 0;
  background: var(--color-border);
  border-radius: 12px;
  transition: background var(--duration-fast) var(--ease-out);
}
.calc__switch-track::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
  transition: transform var(--duration-fast) var(--ease-out);
}
.calc__switch input:checked + .calc__switch-track {
  background: var(--color-accent);
}
.calc__switch input:checked + .calc__switch-track::after {
  transform: translateX(20px);
}

/* Right panel: results */
.calc__results {
  position: sticky;
  top: calc(var(--nav-height) + var(--space-6));
}

.calc__result-card {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  color: #fff;
  position: relative;
  overflow: hidden;
}
.calc__result-card::before {
  content: '';
  position: absolute;
  top: -50px;
  right: -50px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: rgba(249, 115, 22, 0.1);
  filter: blur(60px);
  pointer-events: none;
}

.calc__total-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-2);
}
.calc__total {
  font-size: var(--text-5xl);
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
}
.calc__total-period {
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: var(--space-8);
}

/* Cost breakdown bars */
.calc__breakdown {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}
.calc__break-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.calc__break-header {
  display: flex;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.6);
}
.calc__break-value {
  font-family: var(--font-mono);
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
}
.calc__break-bar {
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.1);
  overflow: hidden;
}
.calc__break-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--color-accent);
  transition: width 0.5s var(--ease-out);
}
.calc__break-fill--output {
  background: var(--color-accent-200);
}
.calc__break-fill--tools {
  background: #fbbf24;
}

/* Per-conversation stat */
.calc__per-conv {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}
.calc__per-stat {
  text-align: center;
}
.calc__per-number {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: #fff;
}
.calc__per-label {
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.5);
  margin-top: var(--space-1);
}

/* Comparison cards below */
.calc__compare {
  margin-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.calc__compare-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}
.calc__alt {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
}
.calc__alt-name {
  font-weight: 600;
  color: var(--color-text);
}
.calc__alt-price {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-accent);
}
.calc__alt-diff {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-left: var(--space-2);
}
.calc__alt-diff--cheaper {
  color: #10b981;
}
.calc__alt-diff--expensive {
  color: #ef4444;
}