/* ================================================================
   PC Builder — Light UI Redesign
   Version: 3.0.0 | "Build Sheet" — a blueprint/spec-sheet aesthetic
   grounded in real PC-hardware materials: PCB blue, copper pins,
   dot-grid schematic paper, tabular spec-sheet numerals.

   Design tokens
   -------------
   Paper       #f7f7fa   page background
   Surface     #ffffff   card background
   Ink         #14161f   primary text
   Circuit Blue #3454ff  primary interactive accent (PCB / RGB blue)
   Copper      #ad5a20   completion / price / value accent
   Signal Red  #d1453b   destructive actions

   Type roles
   ----------
   Display : Space Grotesk  — category names, titles (technical, geometric)
   Body    : Inter          — UI copy, buttons, descriptions
   Mono    : JetBrains Mono — every number: prices, qty, totals, IDs
             (spec-sheet numerals — the signature typographic choice)

   Signature element
   ------------------
   A dashed "circuit trace" lives along the base of every category
   box. It energizes blue and flows on hover (inviting a connection),
   then locks solid copper once a part is added (current is flowing /
   the slot is powered). All motion is transform/opacity driven and
   is fully disabled under prefers-reduced-motion.
================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Space+Grotesk:wght@500;600;700&family=JetBrains+Mono:wght@500;600;700;800&display=swap');

/* ================================================================
   1) Design Tokens
================================================================ */
:root {
  --pcf-paper: #f7f7fa;
  --pcf-surface: #ffffff;
  --pcf-surface-alt: #f1f2f6;
  --pcf-surface-sunk: #e9ebf1;

  --pcf-ink: #14161f;
  --pcf-ink-dim: #5b6273;
  --pcf-ink-faint: #9298a8;

  --pcf-border: rgba(20, 22, 31, 0.09);
  --pcf-border-strong: rgba(20, 22, 31, 0.18);
  --pcf-border-active: rgba(52, 84, 255, 0.4);

  --pcf-blue: #3454ff;
  --pcf-blue-deep: #2740d6;
  --pcf-blue-soft: rgba(52, 84, 255, 0.08);
  --pcf-blue-glow: rgba(52, 84, 255, 0.24);

  --pcf-copper: #ad5a20;
  --pcf-copper-bright: #d9822f;
  --pcf-copper-soft: rgba(173, 90, 32, 0.1);
  --pcf-copper-glow: rgba(173, 90, 32, 0.26);

  --pcf-red: #d1453b;
  --pcf-red-soft: rgba(209, 69, 59, 0.1);

  --pcf-radius-sm: 7px;
  --pcf-radius-md: 12px;
  --pcf-radius-lg: 18px;
  --pcf-radius-xl: 24px;

  --pcf-shadow-card: 0 1px 3px rgba(20, 22, 31, 0.05), 0 1px 2px rgba(20, 22, 31, 0.04);
  --pcf-shadow-hover: 0 20px 38px -16px rgba(20, 22, 31, 0.22), 0 4px 12px rgba(20, 22, 31, 0.06);
  --pcf-shadow-blue: 0 0 0 1px rgba(52, 84, 255, 0.14), 0 12px 28px -8px rgba(52, 84, 255, 0.3);
  --pcf-shadow-copper: 0 0 0 1px rgba(173, 90, 32, 0.16), 0 10px 22px -8px rgba(173, 90, 32, 0.26);

  --pcf-font-display: 'Space Grotesk', 'Inter', sans-serif;
  --pcf-font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --pcf-font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

  --pcf-ease: cubic-bezier(0.4, 0, 0.2, 1);
  --pcf-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --pcf-fast: 0.15s;
  --pcf-base: 0.25s;
  --pcf-slow: 0.4s;
}

/* ================================================================
   2) Reset scope + Container Layout
================================================================ */
#pc-builder-container,
#pc-builder-container *,
#pc-builder-container *::before,
#pc-builder-container *::after,
#pc-builder-modal,
#pc-builder-modal *,
#pc-builder-modal *::before,
#pc-builder-modal *::after {
  box-sizing: border-box;
}

#pc-builder-container {
  display: grid;
  grid-template-columns: minmax(260px, 1.1fr) minmax(380px, 2.2fr) minmax(260px, 1fr);
  gap: 24px;
  align-items: start;
  max-width: 1440px;
  margin: 0 auto;
  padding: 32px;
  font-family: var(--pcf-font-body);
  color: var(--pcf-ink);
  border-radius: var(--pcf-radius-xl);
  border: 1px solid var(--pcf-border);
  box-shadow: var(--pcf-shadow-card);
  position: relative;
  background:
    radial-gradient(circle at 1px 1px, rgba(20, 22, 31, 0.05) 1px, transparent 0) 0 0 / 24px 24px,
    radial-gradient(560px circle at -4% -8%, rgba(52, 84, 255, 0.055), transparent 60%),
    radial-gradient(560px circle at 106% 112%, rgba(173, 90, 32, 0.045), transparent 60%),
    var(--pcf-paper);
}

@media (max-width: 1100px) {
  #pc-builder-container {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
  }

  #pc-builder-summary {
    grid-column: 1 / -1;
    position: static;
  }
}

@media (max-width: 700px) {
  #pc-builder-container {
    grid-template-columns: 1fr;
    padding: 18px;
    gap: 16px;
    border-radius: var(--pcf-radius-lg);
  }
}

/* ================================================================
   3) Big Category Box (Left Panel) — hero slot
================================================================ */
#pc-builder-left {
  display: flex;
  align-items: stretch;
}

.pc-builder-big-case {
  width: 100%;
  min-height: 480px;
  background: transparent !important;
  border-radius: var(--pcf-radius-lg);
  border: 1px solid var(--pcf-border);
  text-align: center;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  padding: 28px 20px;
  transition: border-color var(--pcf-base) var(--pcf-ease),
    box-shadow var(--pcf-base) var(--pcf-ease),
    transform var(--pcf-base) var(--pcf-ease);
  overflow: hidden;
}

/* dashed schematic frame — solidifies to blue on hover */
.pc-builder-big-case::before {
  content: '';
  position: absolute;
  inset: 14px;
  border: 1.5px dashed var(--pcf-border-strong);
  border-radius: calc(var(--pcf-radius-lg) - 8px);
  opacity: 0.55;
  transition: opacity var(--pcf-base) var(--pcf-ease), border-color var(--pcf-base) var(--pcf-ease);
  pointer-events: none;
}

.pc-builder-big-case::after {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  width: 64px;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: linear-gradient(90deg, transparent, var(--pcf-blue), transparent);
  transform: translateX(-50%) scaleX(0);
  transition: transform var(--pcf-base) var(--pcf-ease);
}

.pc-builder-big-case:hover::before {
  opacity: 1;
  border-color: var(--pcf-blue);
}

.pc-builder-big-case:hover::after {
  transform: translateX(-50%) scaleX(1);
}

.pc-builder-big-case:hover {
  border-color: var(--pcf-border-active);
  box-shadow: var(--pcf-shadow-blue);
  transform: translateY(-3px);
}

.pc-builder-big-case.box-filled { background: transparent !important; }
.pc-builder-big-case.no-pc-case {
  cursor: default;
  color: var(--pcf-ink-faint);
  font-size: 0.95rem;
  font-family: var(--pcf-font-mono);
}

.pc-builder-big-case.no-pc-case::before {
  border-style: solid;
  opacity: 0.5;
}

.pc-builder-big-case.no-pc-case:hover {
  transform: none;
  border-color: var(--pcf-border);
  box-shadow: none;
}

.pc-builder-big-case.no-pc-case:hover::before {
  border-color: var(--pcf-border-strong);
}

.pc-builder-big-case.no-pc-case:hover::after {
  transform: translateX(-50%) scaleX(0);
}

.pc-builder-big-case .category-name {
  font-family: var(--pcf-font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--pcf-ink);
  margin-bottom: 14px;
  letter-spacing: -0.02em;
  position: relative;
  z-index: 2;
}

.pc-builder-big-case .plus-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.7rem;
  color: var(--pcf-blue);
  font-weight: 300;
  margin-top: 14px;
  border: 1.5px dashed var(--pcf-blue);
  border-radius: 50%;
  transition: transform var(--pcf-spring), background var(--pcf-base) var(--pcf-ease), border-style var(--pcf-fast) linear;
  position: relative;
  z-index: 2;
  line-height: 1;
}

.pc-builder-big-case:hover .plus-icon {
  color: var(--pcf-blue-deep);
  background: var(--pcf-blue-soft);
  border-style: solid;
  transform: rotate(90deg) scale(1.08);
}

.pc-builder-big-case .big-product-image {
  max-width: 92%;
  max-height: 380px;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: var(--pcf-radius-md);
  transition: transform var(--pcf-spring);
  filter: drop-shadow(0 18px 28px rgba(20, 22, 31, 0.14));
  position: relative;
  z-index: 2;
}

.pc-builder-big-case:hover .big-product-image {
  transform: scale(1.035) translateY(-4px);
}

/* ================================================================
   4) Center Grid + Category Boxes
================================================================ */
#pc-builder-center {
  display: grid;
  gap: 14px;
  align-content: start;
}

#pc-builder-center[data-columns="2"] {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

#pc-builder-center[data-columns="3"] {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

#pc-builder-center[data-columns="4"] {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 900px) {

  #pc-builder-center[data-columns="3"],
  #pc-builder-center[data-columns="4"] {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {

  #pc-builder-center[data-columns="2"],
  #pc-builder-center[data-columns="3"],
  #pc-builder-center[data-columns="4"] {
    grid-template-columns: repeat(2, 1fr);
  }
}

.pc-builder-category-box {
  background: var(--pcf-surface);
  border: 1px solid var(--pcf-border);
  border-radius: var(--pcf-radius-md);
  text-align: center;
  padding: 16px 10px;
  position: relative;
  cursor: pointer;
  transition: transform var(--pcf-base) var(--pcf-ease),
    box-shadow var(--pcf-base) var(--pcf-ease),
    border-color var(--pcf-base) var(--pcf-ease);
  height: 100%;
  min-height: 92px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  overflow: hidden;
  min-width: 0;
  contain: layout style;
  animation: pcfBoxIn 0.4s var(--pcf-ease) backwards;
}

/* signature: dashed circuit trace along the base — blue while empty & hovered */
.pc-builder-category-box::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 8px;
  right: 8px;
  height: 3px;
  border-radius: 2px 2px 0 0;
  background: repeating-linear-gradient(90deg, var(--pcf-blue) 0 5px, transparent 5px 9px);
  background-size: 160% 100%;
  opacity: 0;
  transition: opacity var(--pcf-base) var(--pcf-ease);
}

.pc-builder-category-box:hover::before {
  opacity: 1;
  animation: pcfTraceFlow 0.9s linear infinite;
}

.pc-builder-category-box:hover {
  border-color: rgba(52, 84, 255, 0.28);
  transform: translateY(-3px);
  box-shadow: var(--pcf-shadow-hover);
}

.pc-builder-category-box .category-name {
  font-family: var(--pcf-font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--pcf-ink);
  line-height: 1.3;
  letter-spacing: -0.005em;
}

.pc-builder-category-box .category-number {
  position: absolute;
  top: 7px;
  left: 8px;
  font-family: var(--pcf-font-mono);
  font-size: 9.5px;
  font-weight: 600;
  color: var(--pcf-ink-faint);
  letter-spacing: 0.03em;
}

.pc-builder-category-box .plus-icon {
  font-size: 15px;
  color: var(--pcf-blue);
  font-weight: 700;
  transition: transform var(--pcf-spring), opacity var(--pcf-fast) linear, color var(--pcf-fast) linear;
  opacity: 0.55;
}

.pc-builder-category-box:hover .plus-icon {
  color: var(--pcf-blue-deep);
  opacity: 1;
  transform: rotate(90deg) scale(1.15);
}

.pc-builder-category-icon {
  max-width: 34px;
  max-height: 34px;
  object-fit: contain;
  display: block;
  margin: 0 auto 4px;
  opacity: 0.85;
  transition: opacity var(--pcf-fast) linear;
}

.pc-builder-category-box:hover .pc-builder-category-icon {
  opacity: 1;
}

/* ================================================================
   5) Box Filled State
================================================================ */
.box-filled {
  background: var(--pcf-surface);
  border-color: rgba(173, 90, 32, 0.35) !important;
  cursor: default;
  animation: pcfFillIn 0.35s var(--pcf-spring);
}

@keyframes pcfFillIn {
  from {
    transform: scale(0.95);
    opacity: 0.6;
  }

  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* trace locks solid copper — "powered" */
.box-filled::before {
  background: linear-gradient(90deg, var(--pcf-copper), var(--pcf-copper-bright));
  opacity: 1;
  animation: none;
}

.box-filled::after {
  content: '✓';
  position: absolute;
  top: 7px;
  right: 7px;
  background: var(--pcf-copper);
  color: #fff;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 800;
  z-index: 3;
  animation: pcfCheckIn 0.3s var(--pcf-spring);
  box-shadow: 0 2px 6px rgba(173, 90, 32, 0.35);
}

@keyframes pcfCheckIn {
  from {
    transform: scale(0);
  }

  to {
    transform: scale(1);
  }
}

.box-product-info {
  text-align: center;
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4px;
}

.box-category-name {
  font-family: var(--pcf-font-body);
  font-size: 11px;
  font-weight: 700;
  color: var(--pcf-ink-dim);
  background: var(--pcf-surface-alt);
  padding: 4px 10px;
  border-radius: 12px;
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.box-product-info img {
  max-width: 90%;
  max-height: 110px;
  object-fit: contain;
  border-radius: var(--pcf-radius-sm);
  margin-bottom: 8px;
  transition: transform var(--pcf-base) var(--pcf-ease);
  filter: drop-shadow(0 6px 12px rgba(20, 22, 31, 0.12));
}

.box-product-info:hover img {
  transform: scale(1.05) translateY(-2px);
}

.box-product-name {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--pcf-ink);
  line-height: 1.3;
  margin: 0 0 4px;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.box-product-info .product-price {
  font-family: var(--pcf-font-body);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--pcf-copper);
  background: var(--pcf-copper-soft);
  padding: 4px 12px;
  border-radius: 6px;
  display: inline-block;
  letter-spacing: -0.02em;
  margin-top: 4px;
  border: 1px solid rgba(173, 90, 32, 0.15);
}

.box-remove-product {
  position: absolute;
  top: 2px;
  left: 2px;
  background: var(--pcf-red-soft);
  border: none;
  color: var(--pcf-red);
  font-size: 13px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform var(--pcf-fast) var(--pcf-ease), background var(--pcf-fast) var(--pcf-ease), opacity var(--pcf-fast) linear;
  z-index: 3;
  padding: 0;
  opacity: 0;
}

.box-filled:hover .box-remove-product {
  opacity: 1;
}

.box-remove-product:hover {
  background: var(--pcf-red);
  color: #fff;
  transform: scale(1.1);
}

/* ================================================================
   6) Quantity Controls
================================================================ */
.box-quantity-controls {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  background: var(--pcf-surface-alt);
  padding: 3px;
  border-radius: 30px;
  border: 1px solid var(--pcf-border);
  height: 32px;
  min-width: 90px;
  margin-top: 10px;
}

.box-quantity-controls button {
  background: var(--pcf-surface);
  color: var(--pcf-ink-dim);
  border: 1px solid var(--pcf-border);
  width: 26px;
  height: 26px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--pcf-fast) var(--pcf-ease);
  font-weight: 600;
  line-height: 1;
  flex-shrink: 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.box-quantity-controls button:hover {
  background: var(--pcf-blue);
  color: #fff;
  border-color: var(--pcf-blue);
}

.box-quantity-controls button:active {
  transform: scale(0.92);
}

.box-quantity-controls input.box-product-qty {
  width: 30px;
  height: 100%;
  border: none;
  background: transparent;
  text-align: center;
  font-size: 13px;
  font-weight: 700;
  padding: 0;
  margin: 0;
  color: var(--pcf-ink);
  font-family: var(--pcf-font-body);
  outline: none;
}

.box-quantity-controls input.box-product-qty:focus {
  outline: none;
}

.box-quantity-controls input[type=number]::-webkit-inner-spin-button,
.box-quantity-controls input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.box-quantity-controls input[type=number] {
  -moz-appearance: textfield;
}

/* ================================================================
   7) Breakpoint
================================================================ */
.pc-builder-breakpoint {
  grid-column: 1 / -1;
  padding: 4px 12px;
  text-align: center;
  position: relative;
  margin: 10px 0;
}

.pc-builder-breakpoint::before,
.pc-builder-breakpoint::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  width: calc(50% - 60px);
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(20, 22, 31, 0.16));
}

.pc-builder-breakpoint::after {
  left: auto;
  right: 0;
  background: linear-gradient(270deg, transparent, rgba(20, 22, 31, 0.16));
}

.pc-builder-breakpoint h3 {
  display: inline-block;
  margin: 0;
  font-family: var(--pcf-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--pcf-blue);
  background: var(--pcf-surface);
  padding: 4px 14px;
  border-radius: 20px;
  border: 1px solid rgba(52, 84, 255, 0.25);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  position: relative;
  z-index: 1;
}

/* ================================================================
   8) Summary Panel
================================================================ */
#pc-builder-summary {
  background: var(--pcf-surface);
  border-radius: var(--pcf-radius-lg);
  padding: 22px;
  border: 1px solid var(--pcf-border);
  position: sticky;
  top: 20px;
  max-height: calc(100vh - 60px);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--pcf-shadow-card);
}

.summary-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--pcf-border);
  flex-shrink: 0;
}

.summary-header h3 {
  margin: 0;
  font-family: var(--pcf-font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--pcf-ink);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.summary-header .total {
  font-family: var(--pcf-font-mono);
  font-size: 13px;
  font-weight: 700;
  color: #EE625C;
  background: rgba(238, 98, 92, 0.08);
  padding: 6px 12px;
  border-radius: 10px;
  border: 1px solid rgba(238, 98, 92, 0.18);
  transition: transform var(--pcf-fast) var(--pcf-ease), box-shadow var(--pcf-fast) var(--pcf-ease);
}

.summary-header .total:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(238, 98, 92, 0.24);
}

#pc-builder-summary-items {
  flex: 1;
  overflow-y: auto;
  margin: 0 -22px;
  padding: 0 22px;
  min-height: 0;
}

#pc-builder-summary-items::-webkit-scrollbar {
  width: 4px;
}

#pc-builder-summary-items::-webkit-scrollbar-track {
  background: transparent;
}

#pc-builder-summary-items::-webkit-scrollbar-thumb {
  background: rgba(20, 22, 31, 0.14);
  border-radius: 2px;
}

.summary-empty {
  text-align: center;
  padding: 32px 10px;
  color: var(--pcf-ink-faint);
  font-size: 12px;
  line-height: 1.6;
}

.summary-empty-icon {
  font-size: 26px;
  display: block;
  margin-bottom: 8px;
  opacity: 0.35;
}

.summary-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--pcf-border);
  animation: pcfSlideIn 0.25s var(--pcf-ease) backwards;
}

.summary-item:last-child {
  border-bottom: none;
}

@keyframes pcfSlideIn {
  from {
    opacity: 0;
    transform: translateX(-8px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.summary-item-img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  border-radius: 6px;
  background: var(--pcf-surface-alt);
  flex-shrink: 0;
  padding: 2px;
}

.summary-item-info {
  flex: 1;
  min-width: 0;
}

.summary-item-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--pcf-ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  display: block;
}

.summary-item-cat {
  font-family: var(--pcf-font-mono);
  font-size: 9.5px;
  color: var(--pcf-ink-faint);
  display: block;
  margin-top: 2px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.summary-item-price {
  font-family: var(--pcf-font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--pcf-copper);
  white-space: nowrap;
  flex-shrink: 0;
}

.summary-divider {
  border: none;
  border-top: 1px solid var(--pcf-border);
  margin: 14px 0;
  flex-shrink: 0;
}

.summary-total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 0 0 14px 0;
  flex-shrink: 0;
}

.summary-total-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--pcf-ink-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.summary-total-amount {
  font-family: var(--pcf-font-mono);
  font-size: 19px;
  font-weight: 800;
  color: var(--pcf-ink);
  letter-spacing: -0.02em;
}

.summary-buttons {
  display: grid;
  gap: 8px;
  flex-shrink: 0;
  margin-top: 4px;
}

.summary-buttons .button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  width: 100%;
  padding: 12px;
  font-size: 13px;
  font-weight: 700;
  border: none;
  border-radius: var(--pcf-radius-sm);
  cursor: pointer;
  text-align: center;
  transition: transform var(--pcf-fast) var(--pcf-ease), box-shadow var(--pcf-fast) var(--pcf-ease), background var(--pcf-fast) var(--pcf-ease);
  font-family: var(--pcf-font-body);
  letter-spacing: -0.01em;
  position: relative;
  overflow: hidden;
}

.summary-buttons .button:hover {
  transform: translateY(-2px);
}

.summary-buttons .button:active {
  transform: translateY(0);
}

#pc-builder-remove-all {
  background: var(--pcf-red-soft);
  color: var(--pcf-red);
  border: 1px solid rgba(209, 69, 59, 0.22);
}

#pc-builder-remove-all:hover {
  background: rgba(209, 69, 59, 0.16);
  box-shadow: 0 6px 16px rgba(209, 69, 59, 0.18);
}

#pc-builder-print-invoice,
#pc-builder-download-pdf {
  background: var(--pcf-surface-alt);
  color: var(--pcf-ink-dim);
  border: 1px solid var(--pcf-border);
}

#pc-builder-print-invoice:hover,
#pc-builder-download-pdf:hover {
  background: var(--pcf-surface-sunk);
  color: var(--pcf-ink);
  border-color: var(--pcf-border-strong);
  box-shadow: var(--pcf-shadow-card);
}

#pc-builder-buy-now {
  background: linear-gradient(135deg, #EE625C, #d4514b);
  color: #fff;
  box-shadow: 0 8px 20px rgba(238, 98, 92, 0.3);
  font-size: 14px;
}

#pc-builder-buy-now::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  transition: left 0.6s ease;
}

#pc-builder-buy-now:hover {
  box-shadow: 0 12px 28px rgba(238, 98, 92, 0.42);
}

#pc-builder-buy-now:hover::before {
  left: 100%;
}

/* ================================================================
   9) Modal
================================================================ */
#pc-builder-modal {
  position: fixed;
  z-index: 999999;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(20, 22, 31, 0.42);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  padding: 20px;
}

.pc-builder-modal-content {
  position: relative;
  background: var(--pcf-surface);
  border: 1px solid var(--pcf-border);
  padding: 24px;
  width: 100%;
  max-width: 1000px;
  max-height: 88vh;
  overflow: hidden;
  border-radius: var(--pcf-radius-xl);
  box-shadow: 0 30px 70px rgba(20, 22, 31, 0.28);
  animation: pcfModalIn 0.32s var(--pcf-spring);
  display: flex;
  flex-direction: column;
}

@keyframes pcfModalIn {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(14px);
  }

  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.pc-builder-modal-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
  flex-shrink: 0;
}

.pc-builder-modal-title {
  font-family: var(--pcf-font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--pcf-ink);
  margin: 0;
  letter-spacing: -0.02em;
}

.pc-builder-modal-subtitle {
  font-family: var(--pcf-font-mono);
  font-size: 11.5px;
  color: var(--pcf-ink-faint);
  margin: 2px 0 0 0;
}

.pc-builder-close {
  margin-left: auto;
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--pcf-ink-faint);
  cursor: pointer;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--pcf-surface-alt);
  transition: transform var(--pcf-base) var(--pcf-ease), background var(--pcf-fast) var(--pcf-ease), color var(--pcf-fast) var(--pcf-ease);
  border: 1px solid var(--pcf-border);
  flex-shrink: 0;
}

.pc-builder-close:hover {
  color: var(--pcf-ink);
  background: var(--pcf-surface-sunk);
  transform: rotate(90deg);
}

/* Search bar */
.pc-builder-modal-search-wrap {
  position: relative;
  margin-bottom: 16px;
  flex-shrink: 0;
}

.pc-builder-modal-search-wrap::before {
  content: '';
  position: absolute;
  left: 14px;
  top: 50%;
  width: 16px;
  height: 16px;
  transform: translateY(-50%);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239298a8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cline x1='21' y1='21' x2='16.65' y2='16.65'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  pointer-events: none;
}

#pc-builder-search {
  width: 100%;
  padding: 11px 14px 11px 40px;
  background: rgba(20, 22, 31, 0.02);
  border: 1.5px solid #14161f;
  border-radius: var(--pcf-radius-sm);
  color: var(--pcf-ink);
  font-family: var(--pcf-font-body);
  font-size: 14px;
  outline: none;
  transition: border-color var(--pcf-base) var(--pcf-ease), box-shadow var(--pcf-base) var(--pcf-ease), background var(--pcf-base) var(--pcf-ease);
  box-sizing: border-box;
}

#pc-builder-search::placeholder {
  color: var(--pcf-ink-faint);
}

#pc-builder-search:focus {
  border-color: #000000;
  box-shadow: 0 0 0 3px rgba(20, 22, 31, 0.08);
  background: var(--pcf-surface);
}

#pc-builder-products {
  flex: 1;
  overflow-y: auto;
}

#pc-builder-products::-webkit-scrollbar {
  width: 5px;
}

#pc-builder-products::-webkit-scrollbar-track {
  background: transparent;
}

#pc-builder-products::-webkit-scrollbar-thumb {
  background: rgba(20, 22, 31, 0.14);
  border-radius: 3px;
}

/* Products grid */
.pc-builder-products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  padding-bottom: 4px;
}

.pc-builder-product {
  background: var(--pcf-surface);
  border: 1px solid var(--pcf-border);
  border-radius: var(--pcf-radius-md);
  text-align: center;
  padding: 18px 14px;
  transition: transform var(--pcf-base) var(--pcf-ease), box-shadow var(--pcf-base) var(--pcf-ease), border-color var(--pcf-base) var(--pcf-ease);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  min-width: 0;
  contain: layout style;
  animation: pcfBoxIn 0.35s var(--pcf-ease) backwards;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
}

.pc-builder-product::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--pcf-blue), var(--pcf-copper));
  transform: scaleX(0);
  transform-origin: center;
  transition: transform var(--pcf-base) var(--pcf-ease);
}

.pc-builder-product:hover {
  border-color: rgba(52, 84, 255, 0.3);
  transform: translateY(-4px);
  box-shadow: var(--pcf-shadow-hover);
  background: var(--pcf-surface);
}

.pc-builder-product:hover::after {
  transform: scaleX(1);
}

.pc-builder-product-img-wrapper {
  width: 100%;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #ffffff;
  border-radius: var(--pcf-radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  border: 1px solid var(--pcf-border);
  flex-shrink: 0;
}

.pc-builder-product-img-wrapper img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform var(--pcf-base) var(--pcf-ease);
  filter: drop-shadow(0 4px 8px rgba(20, 22, 31, 0.08));
  padding: 6px;
}

.pc-builder-product:hover .pc-builder-product-img-wrapper img {
  transform: scale(1.05) translateY(-2px);
}

.pc-builder-product h4,
.pc-builder-product .product-title {
  margin: 8px 0;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--pcf-ink);
  line-height: 1.4;
  font-family: var(--pcf-font-body);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  min-height: 3.6em;
  width: 100%;
  flex-grow: 1;
}

.pc-builder-product p {
  font-family: var(--pcf-font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--pcf-copper);
  margin: auto 0 0;
  letter-spacing: -0.01em;
  width: 100%;
}

.no-thumb {
  width: 100%;
  height: 100%;
  background: var(--pcf-surface-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--pcf-ink-faint);
  border-radius: var(--pcf-radius-sm);
  font-size: 0.85rem;
}

/* ================================================================
   10) Skeleton Loaders
================================================================ */
.pc-builder-skeleton-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}

.pc-builder-skeleton-card {
  background: var(--pcf-surface);
  border: 1px solid var(--pcf-border);
  border-radius: var(--pcf-radius-md);
  padding: 18px 14px;
  text-align: center;
}

.pcf-skeleton {
  background: linear-gradient(90deg,
      var(--pcf-surface-alt) 25%,
      var(--pcf-surface-sunk) 50%,
      var(--pcf-surface-alt) 75%);
  background-size: 600px 100%;
  animation: pcfShimmer 1.3s infinite linear;
  border-radius: 6px;
}

@keyframes pcfShimmer {
  0% {
    background-position: -600px 0;
  }

  100% {
    background-position: 600px 0;
  }
}

.pcf-skeleton-img {
  width: 80px;
  height: 80px;
  border-radius: var(--pcf-radius-sm);
  margin: 0 auto 12px;
}

.pcf-skeleton-title {
  height: 12px;
  margin: 0 auto 8px;
  width: 80%;
}

.pcf-skeleton-price {
  height: 14px;
  width: 50%;
  margin: 0 auto;
}

/* ================================================================
   11) Loading Overlay
================================================================ */
#pc-builder-loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.82);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: inherit;
  z-index: 10;
  backdrop-filter: blur(3px);
}

.pcf-loader {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.pcf-loader-spinner {
  width: 38px;
  height: 38px;
  border: 3px solid var(--pcf-blue-soft);
  border-top-color: var(--pcf-blue);
  border-radius: 50%;
  animation: pcfSpin 0.8s linear infinite;
}

@keyframes pcfSpin {
  to {
    transform: rotate(360deg);
  }
}

.pcf-loader-text {
  font-family: var(--pcf-font-mono);
  font-size: 12.5px;
  color: var(--pcf-ink-dim);
  font-weight: 500;
}

.loading-indicator {
  text-align: center;
  padding: 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  color: var(--pcf-ink-faint);
  font-size: 13px;
  font-family: var(--pcf-font-mono);
}

.loading-indicator::before {
  content: '';
  display: block;
  width: 30px;
  height: 30px;
  border: 2px solid var(--pcf-blue-soft);
  border-top-color: var(--pcf-blue);
  border-radius: 50%;
  animation: pcfSpin 0.8s linear infinite;
}

/* ================================================================
   12) Entrance choreography (staggered mount-in)
================================================================ */
@keyframes pcfBoxIn {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.97);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes pcfTraceFlow {
  to {
    background-position: -28px 0;
  }
}

.pc-builder-category-box:nth-child(1),
.pc-builder-product:nth-child(1) {
  animation-delay: 0.02s;
}

.pc-builder-category-box:nth-child(2),
.pc-builder-product:nth-child(2) {
  animation-delay: 0.055s;
}

.pc-builder-category-box:nth-child(3),
.pc-builder-product:nth-child(3) {
  animation-delay: 0.09s;
}

.pc-builder-category-box:nth-child(4),
.pc-builder-product:nth-child(4) {
  animation-delay: 0.125s;
}

.pc-builder-category-box:nth-child(5),
.pc-builder-product:nth-child(5) {
  animation-delay: 0.16s;
}

.pc-builder-category-box:nth-child(6),
.pc-builder-product:nth-child(6) {
  animation-delay: 0.195s;
}

.pc-builder-category-box:nth-child(7),
.pc-builder-product:nth-child(7) {
  animation-delay: 0.23s;
}

.pc-builder-category-box:nth-child(8),
.pc-builder-product:nth-child(8) {
  animation-delay: 0.265s;
}

.pc-builder-category-box:nth-child(9),
.pc-builder-product:nth-child(9) {
  animation-delay: 0.3s;
}

.pc-builder-category-box:nth-child(10),
.pc-builder-product:nth-child(10) {
  animation-delay: 0.335s;
}

.pc-builder-category-box:nth-child(n+11),
.pc-builder-product:nth-child(n+11) {
  animation-delay: 0.335s;
}

.summary-item:nth-child(1) {
  animation-delay: 0.02s;
}

.summary-item:nth-child(2) {
  animation-delay: 0.06s;
}

.summary-item:nth-child(3) {
  animation-delay: 0.1s;
}

.summary-item:nth-child(4) {
  animation-delay: 0.14s;
}

.summary-item:nth-child(n+5) {
  animation-delay: 0.14s;
}

/* ================================================================
   13) Accessibility — focus & reduced motion
================================================================ */
#pc-builder-container button:focus-visible,
#pc-builder-container [tabindex]:focus-visible,
#pc-builder-container input:focus-visible,
#pc-builder-modal button:focus-visible,
#pc-builder-modal input:focus-visible,
.pc-builder-category-box:focus-visible,
.pc-builder-big-case:focus-visible,
.pc-builder-product:focus-visible {
  outline: 2px solid var(--pcf-blue);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {

  #pc-builder-container *,
  #pc-builder-container *::before,
  #pc-builder-container *::after,
  #pc-builder-modal *,
  #pc-builder-modal *::before,
  #pc-builder-modal *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ================================================================
   14) Responsive — Tablet & Mobile
================================================================ */
@media (max-width: 768px) {
  #pc-builder-container {
    padding: 18px;
    gap: 14px;
  }

  .pc-builder-big-case {
    min-height: 320px;
  }

  .pc-builder-products-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 12px;
  }

  #pc-builder-modal {
    padding: 10px;
  }

  .pc-builder-modal-content {
    border-radius: var(--pcf-radius-lg);
    padding: 18px;
    max-height: 95vh;
  }

  .summary-buttons .button {
    padding: 10px;
    font-size: 12px;
  }
}

@media (max-width: 480px) {
  #pc-builder-container {
    padding: 12px;
    gap: 12px;
  }

  .pc-builder-big-case {
    min-height: 240px;
  }

  .pc-builder-category-box {
    padding: 12px 8px;
    min-height: 76px;
  }

  .pc-builder-modal-content {
    padding: 14px;
  }

  .pc-builder-product {
    padding: 14px 10px;
  }

  .pc-builder-products-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
}

/* ================================================================
   15) Beautiful Matted Progress Bar
================================================================ */
#pcb-progress-container {
  grid-column: 1 / -1;
  background: rgba(20, 22, 31, 0.02);
  border: 1px dashed var(--pcf-border-strong);
  border-radius: var(--pcf-radius-md);
  padding: 16px 20px;
  margin-bottom: 8px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pcb-progress-text-wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.pcb-progress-comment {
  font-family: var(--pcf-font-body);
  font-weight: 600;
  color: var(--pcf-ink-dim);
  transition: color 0.3s ease;
}

.pcb-progress-percent {
  font-family: var(--pcf-font-mono);
  font-weight: 700;
  color: #EE625C;
}

.pcb-progress-bar-bg {
  width: 100%;
  height: 6px;
  background: var(--pcf-surface-alt);
  border-radius: 10px;
  overflow: hidden;
  position: relative;
}

.pcb-progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #EE625C, #ff8b87);
  border-radius: 10px;
  transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}