/* ─── Builder Layout ─── */
.builder-layout {
  padding-top: calc(var(--navbar-h) + var(--sp-10));
  padding-bottom: var(--sp-16);
  display: flex;
  flex-direction: column;
  gap: var(--sp-8);
}

.builder-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--sp-6);
}
.builder-header__title { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 700; }
.builder-header__sub { color: var(--txt-secondary); margin-top: var(--sp-2); font-size: 0.9rem; }

/* ─── Step Progress ─── */
.builder-progress {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  padding-bottom: var(--sp-2);
  scrollbar-width: none;
}
.builder-progress::-webkit-scrollbar { display: none; }

.step-item {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
.step-dot {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-2);
  cursor: pointer;
  transition: all var(--t-base);
}
.step-dot__circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--border-muted);
  background: var(--bg-card);
  color: var(--txt-muted);
  font-size: 0.82rem;
  font-weight: 700;
  font-family: var(--font-mono);
  transition: all var(--t-base);
  position: relative;
}
.step-dot__circle [data-lucide] { width: 16px; height: 16px; }
.step-dot__label {
  font-size: 0.72rem;
  color: var(--txt-muted);
  text-align: center;
  white-space: nowrap;
  max-width: 72px;
  line-height: 1.3;
  transition: color var(--t-base);
}

.step-item.active .step-dot__circle {
  border-color: var(--clr-cyan);
  background: var(--clr-cyan-glow);
  color: var(--clr-cyan);
  box-shadow: 0 0 16px rgba(0,245,255,0.3);
}
.step-item.active .step-dot__label { color: var(--clr-cyan); font-weight: 600; }

.step-item.completed .step-dot__circle {
  background: linear-gradient(135deg, var(--clr-cyan), var(--clr-violet));
  border-color: transparent;
  color: var(--bg-base);
}
.step-item.completed .step-dot__label { color: var(--txt-secondary); }

.step-connector {
  height: 2px;
  flex: 1;
  min-width: 32px;
  max-width: 80px;
  background: var(--border-subtle);
  margin-bottom: 20px;
  transition: background var(--t-base);
}
.step-item.completed + .step-connector {
  background: linear-gradient(90deg, var(--clr-cyan), var(--clr-violet));
}

/* ─── Builder Body ─── */
.builder-body {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--sp-8);
  align-items: start;
}

/* ─── Step Panel ─── */
.builder-step-panel {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

.step-panel-header {
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  padding: var(--sp-5) var(--sp-6);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
}
.step-panel-header__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-cyan-glow);
  border: 1px solid var(--border-cyan);
  border-radius: var(--radius-md);
  color: var(--clr-cyan);
  flex-shrink: 0;
}
.step-panel-header__icon [data-lucide] { width: 22px; height: 22px; }
.step-panel-header__text h3 { font-size: 1.1rem; }
.step-panel-header__text p { font-size: 0.83rem; color: var(--txt-secondary); margin-top: 2px; }

.builder-options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--sp-4);
}

/* Component option card */
.comp-card {
  background: var(--bg-card);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--sp-4);
  cursor: pointer;
  transition: all var(--t-base);
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  position: relative;
  overflow: hidden;
}
.comp-card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--clr-cyan-glow), transparent 60%);
  opacity: 0;
  transition: opacity var(--t-base);
  pointer-events: none;
}
.comp-card:hover {
  border-color: var(--border-cyan);
  transform: translateY(-2px);
  box-shadow: var(--shadow-cyan);
}
.comp-card:hover::after { opacity: 1; }
.comp-card.selected {
  border-color: var(--clr-cyan);
  background: var(--clr-cyan-glow);
  box-shadow: var(--shadow-cyan);
}
.comp-card.selected::after { opacity: 1; }

.comp-card__check {
  position: absolute;
  top: var(--sp-3);
  right: var(--sp-3);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-cyan), var(--clr-violet));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--bg-base);
  opacity: 0;
  transform: scale(0);
  transition: all var(--t-spring);
}
.comp-card__check [data-lucide] { width: 12px; height: 12px; }
.comp-card.selected .comp-card__check {
  opacity: 1;
  transform: scale(1);
}

.comp-card__image {
  width: 100%;
  aspect-ratio: 16/10;
  border-radius: var(--radius-md);
  object-fit: contain;
  object-position: center;
  padding: 8px;
  background: var(--bg-surface-2);
}

.comp-card__name {
  font-size: 0.88rem;
  font-weight: 600;
  line-height: 1.4;
  position: relative;
}
.comp-card__specs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-1);
}
.comp-card__price {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--clr-cyan);
  font-family: var(--font-mono);
  position: relative;
}

/* Step nav buttons */
.step-nav {
  display: flex;
  justify-content: flex-end;
  gap: var(--sp-3);
  padding-top: var(--sp-4);
}

/* ─── Builder Summary ─── */
.builder-summary {
  position: sticky;
  top: calc(var(--navbar-h) + var(--sp-4));
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--sp-5);
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}
.builder-summary__title {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--txt-secondary);
  padding-bottom: var(--sp-4);
  border-bottom: 1px solid var(--border-subtle);
}
.builder-summary__title [data-lucide] { width: 16px; height: 16px; color: var(--clr-cyan); }

.builder-summary__items {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  min-height: 160px;
}

.summary-item {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3);
  background: var(--bg-surface-2);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  animation: summaryIn var(--t-spring);
}
@keyframes summaryIn {
  from { opacity: 0; transform: translateX(10px); }
  to   { opacity: 1; transform: translateX(0); }
}
.summary-item__icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-cyan-glow);
  border-radius: var(--radius-sm);
  color: var(--clr-cyan);
  flex-shrink: 0;
}
.summary-item__icon [data-lucide] { width: 14px; height: 14px; }
.summary-item__info { flex: 1; min-width: 0; }
.summary-item__label { font-size: 0.7rem; color: var(--txt-muted); text-transform: uppercase; letter-spacing: 0.06em; }
.summary-item__name { font-size: 0.82rem; font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.summary-item__price { font-size: 0.82rem; font-weight: 700; color: var(--clr-cyan); font-family: var(--font-mono); flex-shrink: 0; }

.summary-empty-slot {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  padding: var(--sp-3);
  border: 1px dashed var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--txt-muted);
  font-size: 0.8rem;
}
.summary-empty-slot [data-lucide] { width: 14px; height: 14px; }

/* Alerts */
.builder-alerts { display: flex; flex-direction: column; gap: var(--sp-2); }
.builder-alert {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-3);
  padding: var(--sp-3) var(--sp-4);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  line-height: 1.5;
  animation: alertIn var(--t-base) ease;
}
@keyframes alertIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}
.builder-alert [data-lucide] { width: 15px; height: 15px; flex-shrink: 0; margin-top: 1px; }
.builder-alert--warning {
  background: rgba(245,158,11,0.10);
  border: 1px solid rgba(245,158,11,0.25);
  color: var(--clr-warning);
}
.builder-alert--error {
  background: rgba(239,68,68,0.10);
  border: 1px solid rgba(239,68,68,0.25);
  color: var(--clr-danger);
}
.builder-alert--success {
  background: rgba(34,197,94,0.10);
  border: 1px solid rgba(34,197,94,0.25);
  color: var(--clr-success);
}

/* Total */
.builder-summary__total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--sp-4);
  background: var(--bg-surface-2);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}
.builder-summary__total span:first-child {
  font-size: 0.85rem;
  color: var(--txt-secondary);
}
.total-price {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--clr-cyan);
  font-family: var(--font-mono);
}

/* ─── Responsive ─── */
@media (max-width: 900px) {
  .builder-body { grid-template-columns: 1fr; }
  .builder-summary {
    position: static;
    order: -1;
  }
  .builder-options-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
}

@media (max-width: 600px) {
  .builder-progress { gap: 0; }
  .step-connector { min-width: 16px; }
  .step-dot__label { display: none; }
}