/* ============================================================
   SHARED CALCULATOR — modern checkout style
   ============================================================ */

.calc-shell {
  max-width: 820px;
  margin: 2rem auto;
  background: var(--bg);
  border: 1px solid var(--bevel-edge);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 1px 4px rgba(0,0,0,.04);
}

.calc-shell-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.calc-shell-title {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--fg);
}

.calc-shell-sub {
  font-size: 0.82rem;
  color: var(--fg-muted);
  margin-top: 0.15rem;
}

/* Period toggle */
.calc-period {
  display: inline-flex;
  background: var(--bg-secondary);
  padding: 3px;
  border-radius: 999px;
  flex-shrink: 0;
}

.calc-period-btn {
  background: transparent;
  border: none;
  color: var(--fg-muted);
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 999px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.2s;
}

.calc-period-btn.active {
  background: var(--fg);
  color: var(--bg);
}

.calc-period-save {
  background: rgba(46,125,50,0.12);
  color: var(--success);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.65rem;
  font-weight: 700;
  margin-left: 4px;
}

/* Step containers */
.calc-step {
  background: var(--bg-secondary);
  border-radius: 10px;
  padding: 1.25rem;
}

.calc-step-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.calc-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--fg);
  color: var(--bg);
  font-size: 0.95rem;
  font-weight: 800;
  flex-shrink: 0;
  line-height: 1;
}

.calc-step-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fg);
}

.calc-recommend {
  margin-left: auto;
  font-size: 0.72rem;
  color: var(--fg-muted);
  background: var(--bg);
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--bevel-edge);
  white-space: nowrap;
}

/* User count buttons */
.calc-user-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.calc-user-btn {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid var(--bevel-edge);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg-muted);
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
  flex: 1;
  min-width: 60px;
  text-align: center;
}

.calc-user-btn:hover {
  border-color: var(--fg);
  color: var(--fg);
}

.calc-user-btn.active {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}

/* VPS grid */
.calc-vps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.6rem;
}

.calc-vps-btn {
  background: var(--bg);
  border: 1px solid var(--bevel-edge);
  border-radius: 10px;
  padding: 1rem 0.75rem;
  cursor: pointer;
  font-family: inherit;
  color: var(--fg);
  text-align: center;
  transition: all 0.15s;
}

.calc-vps-btn:hover {
  border-color: var(--fg);
}

.calc-vps-btn.active {
  border-color: var(--fg);
  background: var(--fg);
  color: var(--bg);
}

.calc-vps-btn strong {
  display: block;
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.calc-vps-btn .calc-vps-spec {
  display: block;
  font-size: 0.68rem;
  opacity: 0.65;
  line-height: 1.3;
  margin-bottom: 0.5rem;
}

.calc-vps-btn em {
  font-style: normal;
  font-size: 0.9rem;
  font-weight: 700;
}

.calc-vps-btn em small {
  font-weight: 400;
  font-size: 0.7rem;
  opacity: 0.6;
}

.calc-vps-btn.active em small {
  opacity: 0.7;
}

/* Side-by-side row for storage + AI */
.calc-row-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 640px) {
  .calc-row-group {
    grid-template-columns: 1fr;
  }
}

.calc-step-compact {
  padding: 1rem;
}

/* Slider */
.calc-slider-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.calc-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 999px;
  outline: none;
  cursor: pointer;
  background: #e2e8f0;
}

.calc-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--fg);
  border-radius: 50%;
  cursor: grab;
  border: 2px solid var(--bg);
  box-shadow: 0 1px 3px rgba(0,0,0,.15);
}

.calc-slider::-moz-range-thumb {
  width: 18px;
  height: 18px;
  background: var(--fg);
  border-radius: 50%;
  cursor: grab;
  border: 2px solid var(--bg);
}

.calc-slider-val {
  font-size: 1rem;
  font-weight: 700;
  color: var(--fg);
  min-width: 50px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.calc-slider-unit {
  font-size: 0.7rem;
  color: var(--fg-muted);
  font-weight: 400;
}

/* AI inference buttons */
.calc-ai-row {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.calc-ai-btn {
  flex: 1;
  min-width: 60px;
  padding: 0.45rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  border: 1px solid var(--bevel-edge);
  border-radius: 8px;
  background: var(--bg);
  color: var(--fg-muted);
  cursor: pointer;
  font-family: inherit;
  text-align: center;
  transition: all 0.15s;
}

.calc-ai-btn:hover {
  border-color: var(--fg);
  color: var(--fg);
}

.calc-ai-btn.active {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}

/* Comparison box */
.calc-compare {
  background: var(--bg-secondary);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
}

.calc-compare-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.35rem 0;
}

.calc-compare-row + .calc-compare-row {
  border-top: 1px solid var(--bevel-edge);
}

.calc-compare-label {
  font-size: 0.82rem;
  color: var(--fg-muted);
}

.calc-compare-old {
  font-size: 0.9rem;
  color: var(--fg-muted);
  text-decoration: line-through;
  font-weight: 600;
}

.calc-compare-new {
  font-size: 0.9rem;
  color: var(--fg);
  font-weight: 700;
}

.calc-compare-save {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--success);
}

.calc-compare-save strong {
  font-weight: 800;
}

/* Footer: price + CTA */
.calc-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 1.25rem;
  border-top: 1px solid var(--bevel-edge);
}

.calc-price {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
}

.calc-price-amount {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--fg);
}

.calc-price-period {
  font-size: 0.82rem;
  color: var(--fg-muted);
}

.calc-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.5rem;
  font-size: 0.9rem;
  font-weight: 700;
  background: var(--fg);
  color: var(--bg);
  border: none;
  border-radius: 999px;
  text-decoration: none;
  cursor: pointer;
  font-family: inherit;
  transition: opacity 0.15s;
}

.calc-cta:hover {
  opacity: 0.85;
}

.calc-trust {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  font-size: 0.72rem;
  color: var(--fg-subtle);
  margin-top: 1rem;
}

/* Responsive */
@media (max-width: 640px) {
  .calc-shell {
    padding: 1.25rem;
    margin: 1rem;
  }
  .calc-shell-head {
    flex-direction: column;
    align-items: flex-start;
  }
  .calc-vps-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .calc-footer {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }
  .calc-cta {
    width: 100%;
    text-align: center;
  }
  .calc-user-btn {
    min-width: 50px;
  }
}