/* ==========================================================================
   BOXD - BOXD Studio Custom Box Builder (Light Background, Black & Purple Theme)
   ========================================================================== */

.builder-layout {
  padding: 40px 0 140px;
  min-height: calc(100vh - 120px);
}

/* Step Panes Smooth Fade-in */
.builder-step-pane {
  display: none;
}

.builder-step-pane.active {
  display: block;
  animation: studioStepFadeIn 0.28s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes studioStepFadeIn {
  0% {
    opacity: 0;
    transform: translateY(8px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Step Wizard Stepper */
.builder-stepper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-bottom: 48px;
  position: relative;
  flex-wrap: wrap;
}

.stepper-step {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  background: #ffffff;
  border: var(--border-pixel);
  box-shadow: var(--shadow-pixel-sm);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-muted);
  transition: transform 0.1s, box-shadow 0.1s;
}

.stepper-step.active {
  background: #121214;
  color: #ffffff;
  box-shadow: 4px 4px 0px #9333ea;
  transform: translate(-2px, -2px);
}

.stepper-step.completed {
  background: #f1f5f9;
  border-color: #121214;
  color: #121214;
}

.step-circle {
  width: 32px;
  height: 32px;
  background: #f1f5f9;
  border: 1.5px solid #121214;
  border-radius: 4px;
  color: #121214;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-title);
  font-size: 1.15rem;
  font-weight: 900;
}

.stepper-step.active .step-circle {
  background: #9333ea;
  color: #ffffff;
  border-color: #121214;
}

.stepper-step.completed .step-circle {
  background: #10b981;
  color: #ffffff;
}

/* ==========================================================================
   STAGE 1: TIER SELECTION CARDS & MOBILE 3D WHEEL SLIDER
   ========================================================================== */
.tier-wheel-container {
  position: relative;
  width: 100%;
  margin-top: 24px;
}

.tier-wheel-arrow {
  display: none;
}

.tier-wheel-dots {
  display: none;
}

.tier-cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tier-card {
  background: #ffffff;
  border: var(--border-pixel-thick);
  box-shadow: var(--shadow-pixel);
  border-radius: var(--radius-sm);
  padding: 32px 20px 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: transform 0.15s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.15s cubic-bezier(0.16, 1, 0.3, 1), background-color 0.15s;
  position: relative;
  box-sizing: border-box;
}

.tier-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 6px 6px 0px #9333ea;
  background: #faf5ff;
}

.tier-card.selected {
  background: #faf5ff;
  border-color: #121214;
  box-shadow: 6px 6px 0px #9333ea;
}

.tier-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 14px;
  background: #9333ea;
  color: #ffffff;
  border: 1.5px solid #121214;
  box-shadow: 2px 2px 0px #000;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

/* Green "SELECTED" Tag for PC and Large Screens */
.tier-selected-tag {
  display: none;
}

@media (min-width: 769px) {
  .tier-card.selected .tier-selected-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    position: absolute;
    top: -15px;
    left: 14px;
    padding: 4px 12px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: #ffffff;
    border: 1.5px solid #121214;
    box-shadow: 2px 2px 0px #121214;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.98rem;
    font-weight: 900;
    letter-spacing: 0.6px;
    text-transform: uppercase;
    white-space: nowrap;
    z-index: 10;
    animation: tierSelectedTagPop 0.22s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  }

  [dir="rtl"] .tier-card.selected .tier-selected-tag {
    left: auto;
    right: 14px;
  }
}

@media (max-width: 768px) {
  .tier-selected-tag {
    display: none !important;
  }
}

@keyframes tierSelectedTagPop {
  0% {
    transform: scale(0.65) translateY(4px);
    opacity: 0;
  }
  100% {
    transform: scale(1) translateY(0);
    opacity: 1;
  }
}

.tier-icon-box {
  font-size: 3.2rem;
  margin: 12px 0 8px;
  color: #9333ea;
  filter: drop-shadow(3px 3px 0px rgba(0,0,0,0.12));
}

.tier-name {
  font-family: var(--font-title);
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: 0.6px;
  color: #121214;
  margin-bottom: 8px;
}

.tier-price {
  font-family: var(--font-title);
  font-size: 2.5rem;
  font-weight: 900;
  letter-spacing: 0.8px;
  color: #121214;
  margin-bottom: 12px;
}

.tier-slots-count {
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #121214;
  background: #f3e8ff;
  border: 1.5px solid #121214;
  box-shadow: 2px 2px 0px #9333ea;
  border-radius: var(--radius-sm);
  padding: 5px 14px;
  margin-bottom: 20px;
}

.tier-perks-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-family: var(--font-body);
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  width: 100%;
  text-align: left;
}

html[dir="rtl"] .tier-perks-list {
  text-align: right;
}

.tier-perks-list li {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tier-perks-list i {
  color: #9333ea;
  flex-shrink: 0;
}

/* Mobile 3D Wheel Slider (< 768px) */
@media (max-width: 768px) {
  .tier-wheel-container {
    position: relative;
    width: 100%;
    max-width: 420px;
    margin: 8px auto 0;
    height: 425px;
    perspective: 900px;
    perspective-origin: 50% 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: visible;
    touch-action: pan-y;
  }

  .tier-wheel-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 25;
    width: 38px;
    height: 38px;
    background: #ffffff;
    border: 2px solid #121214;
    box-shadow: 3px 3px 0px #121214;
    border-radius: var(--radius-sm);
    color: #121214;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.12s ease, background 0.12s ease, box-shadow 0.12s ease;
  }

  .tier-wheel-arrow:hover {
    background: #faf5ff;
    transform: translateY(-50%) scale(1.08);
  }

  .tier-wheel-arrow:active {
    transform: translateY(-50%) translate(1px, 1px);
    box-shadow: 1px 1px 0px #121214;
  }

  .tier-wheel-prev {
    left: 2px;
  }

  .tier-wheel-next {
    right: 2px;
  }

  html[dir="rtl"] .tier-wheel-prev {
    left: auto;
    right: 2px;
  }

  html[dir="rtl"] .tier-wheel-next {
    right: auto;
    left: 2px;
  }

  .tier-cards-grid {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform-style: preserve-3d;
  }

  .tier-card {
    position: absolute;
    width: 80%;
    max-width: 275px;
    left: 50%;
    top: 50%;
    margin: 0;
    padding: 18px 12px 14px;
    border: 2px solid #121214;
    border-radius: var(--radius-sm);
    transition: transform 0.38s cubic-bezier(0.25, 1, 0.5, 1),
                opacity 0.38s ease,
                box-shadow 0.38s ease,
                border-color 0.38s ease,
                filter 0.38s ease;
    will-change: transform, opacity;
    user-select: none;
  }

  /* Center / Front Card: Scale 1.0, Focused, Selected */
  .tier-card.wheel-card-center {
    transform: translate(-50%, -50%) translateZ(40px) scale(1);
    opacity: 1;
    z-index: 10;
    pointer-events: auto;
    box-shadow: 6px 6px 0px #9333ea;
    border-color: #121214;
    background: #faf5ff;
    filter: brightness(1);
  }

  /* Left Side Card: Scaled down, rotated inward */
  .tier-card.wheel-card-left {
    transform: translate(-94%, -50%) translateZ(-70px) rotateY(26deg) scale(0.82);
    opacity: 0.55;
    z-index: 5;
    pointer-events: auto;
    cursor: pointer;
    box-shadow: 2px 2px 0px rgba(18, 18, 20, 0.2);
    filter: brightness(0.92);
  }

  /* Right Side Card: Scaled down, rotated inward */
  .tier-card.wheel-card-right {
    transform: translate(-6%, -50%) translateZ(-70px) rotateY(-26deg) scale(0.82);
    opacity: 0.55;
    z-index: 5;
    pointer-events: auto;
    cursor: pointer;
    box-shadow: 2px 2px 0px rgba(18, 18, 20, 0.2);
    filter: brightness(0.92);
  }

  /* RTL Support for Wheel Rotation */
  html[dir="rtl"] .tier-card.wheel-card-left {
    transform: translate(-6%, -50%) translateZ(-70px) rotateY(-26deg) scale(0.82);
  }
  html[dir="rtl"] .tier-card.wheel-card-right {
    transform: translate(-94%, -50%) translateZ(-70px) rotateY(26deg) scale(0.82);
  }

  .tier-badge {
    top: -11px;
    padding: 2px 8px;
    font-size: 0.9rem;
  }

  .tier-icon-box {
    font-size: 2.1rem;
    margin: 4px 0 4px;
  }

  .tier-name {
    font-size: 1.45rem;
    margin-bottom: 2px;
  }

  .tier-price {
    font-size: 1.8rem;
    margin-bottom: 6px;
  }

  .tier-slots-count {
    font-size: 1.05rem;
    padding: 3px 10px;
    margin-bottom: 8px;
  }

  .tier-perks-list {
    gap: 5px;
    font-size: 0.95rem;
    margin-bottom: 0;
  }

  .tier-perks-list li {
    gap: 6px;
  }

  /* Indicator Dots */
  .tier-wheel-dots {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 10px auto 14px;
  }

  .tier-wheel-dot {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    border: 1.5px solid #121214;
    background: #e2e8f0;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    padding: 0;
  }

  .tier-wheel-dot.active {
    background: #9333ea;
    width: 26px;
    box-shadow: 2px 2px 0px #121214;
  }
}

/* ==========================================================================
   STAGE 2: SYMMETRICAL ANIME FANDOMS GRID
   ========================================================================== */
.category-filter-pills.builder-fandoms-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
  max-width: 860px;
  margin: 24px auto 36px;
  align-items: stretch;
}

.builder-fandoms-grid .fandom-pill {
  width: 100%;
  min-height: 52px;
  padding: 10px 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-sizing: border-box;
  text-align: center;
  font-family: var(--font-body);
  font-size: 1.18rem;
  font-weight: 800;
  color: #121214;
  background: #ffffff;
  border: 2px solid #121214;
  box-shadow: 3px 3px 0px #121214;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform 0.12s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.12s cubic-bezier(0.16, 1, 0.3, 1),
              background 0.12s,
              color 0.12s;
  user-select: none;
  white-space: nowrap;
}

.builder-fandoms-grid .fandom-pill:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0px #9333ea;
  border-color: #121214;
  background: #faf5ff;
}

.builder-fandoms-grid .fandom-pill.active {
  background: #121214;
  color: #ffffff;
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0px #9333ea;
  border-color: #121214;
}

@media (max-width: 900px) {
  .category-filter-pills.builder-fandoms-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 640px;
  }
}

@media (max-width: 640px) {
  .category-filter-pills.builder-fandoms-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    max-width: 440px;
    margin: 16px auto 28px;
  }
  .builder-fandoms-grid .fandom-pill {
    min-height: 48px;
    font-size: 1.05rem;
    padding: 8px 6px;
    gap: 6px;
  }
}

.fandoms-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.fandom-card {
  background: #ffffff;
  border: var(--border-pixel);
  box-shadow: var(--shadow-pixel);
  border-radius: var(--radius-sm);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
}

.fandom-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: 4px 4px 0px #9333ea;
}

.fandom-card.selected {
  background: #faf5ff;
  border-color: #121214;
  box-shadow: 4px 4px 0px #9333ea;
}

.fandom-icon-box {
  font-size: 2.5rem;
  margin-bottom: 12px;
  color: #9333ea;
}

.fandom-name {
  font-family: var(--font-title);
  font-size: 1.4rem;
  font-weight: 800;
  color: #121214;
}

/* ==========================================================================
   STAGE 3: PACKING WORKSPACE
   ========================================================================== */
.pack-workspace-grid {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 36px;
  align-items: start;
}

/* Left Sticky Crate Preview */
.crate-preview-panel {
  background: #ffffff;
  border: var(--border-pixel-thick);
  box-shadow: var(--shadow-pixel);
  border-radius: var(--radius-sm);
  padding: 24px;
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.crate-capacity-bar-wrap {
  width: 100%;
}

.crate-capacity-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 10px;
  color: #121214;
}

/* Segmented Progress Bar */
.crate-capacity-track {
  width: 100%;
  height: 20px;
  background: #f1f5f9;
  border: 1.5px solid #121214;
  box-shadow: inset 2px 2px 0px rgba(0,0,0,0.1);
  border-radius: 2px;
  overflow: hidden;
}

.crate-capacity-fill {
  height: 100%;
  width: 0%;
  background: #9333ea;
  background-image: repeating-linear-gradient(90deg, #9333ea 0px, #9333ea 10px, #7e22ce 10px, #7e22ce 12px);
  transition: width 0.25s steps(10);
}

.crate-capacity-fill.full {
  background: #10b981;
  background-image: repeating-linear-gradient(90deg, #10b981 0px, #10b981 10px, #059669 10px, #059669 12px);
}

/* Packed Items Slots Grid */
.packed-items-slots {
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-height: 320px;
  overflow-y: auto;
  padding-right: 6px;
}

.slot-item-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px;
  background: #f8fafc;
  border: 1.5px solid #121214;
  box-shadow: 2px 2px 0px #121214;
  border-radius: var(--radius-sm);
}

.slot-item-thumb {
  width: 44px;
  height: 44px;
  border: 1.5px solid #121214;
  border-radius: 2px;
  object-fit: cover;
  background: #ffffff;
}

.slot-item-details {
  flex: 1;
  min-width: 0;
}

.slot-item-name {
  font-family: var(--font-body);
  font-size: 1.25rem;
  font-weight: 800;
  color: #121214;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.slot-item-cat {
  font-family: var(--font-body);
  font-size: 1.05rem;
  color: #9333ea;
  font-weight: 700;
}

.slot-remove-btn {
  color: #ef4444;
  font-size: 1.1rem;
  padding: 6px;
  transition: transform 0.1s;
}

.slot-remove-btn:hover {
  transform: scale(1.2);
}

/* Right Item Catalog & Tabs */
.pack-catalog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.pack-cat-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.pack-cat-tab,
.pack-cat-tab-btn {
  padding: 8px 16px;
  background: #ffffff;
  border: var(--border-pixel);
  box-shadow: var(--shadow-pixel-sm);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  cursor: pointer;
  transition: transform 0.1s, background 0.1s, color 0.1s, box-shadow 0.1s;
}

.pack-cat-tab:hover,
.pack-cat-tab.active,
.pack-cat-tab-btn:hover,
.pack-cat-tab-btn.active {
  background: #121214;
  color: #ffffff;
  border-color: #121214;
  transform: translate(-1px, -1px);
  box-shadow: 2px 2px 0px #9333ea;
}

/* Symmetric Pack Items Grid */
.pack-items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 18px;
  align-items: stretch;
}

@media (max-width: 600px) {
  .pack-items-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
  }
}

/* Strictly Symmetric Item Card with Uniform Heights */
.pack-item-card {
  background: #ffffff;
  border: var(--border-pixel);
  box-shadow: 3px 3px 0px #121214;
  border-radius: var(--radius-sm);
  padding: 12px;
  display: flex;
  flex-direction: column;
  height: 100%;
  box-sizing: border-box;
  transition: transform 0.15s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
}

.pack-item-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0px #9333ea;
}

/* Uniform Fixed-Dimension Square Image Holder - Equal Size Across All Products */
.pack-item-thumb {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  background: #ffffff;
  border: 1.5px solid #121214;
  border-radius: 2px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  margin-bottom: 10px;
  box-sizing: border-box;
}

/* Scaled Image Strictly Contained Within the Symmetric Holder */
.pack-item-img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  object-position: center;
  display: block;
  filter: drop-shadow(0 3px 6px rgba(0, 0, 0, 0.08));
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.pack-item-card:hover .pack-item-img {
  transform: scale(1.06);
}

.pack-item-category {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: #9333ea;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 3px;
}

.pack-item-title {
  font-family: var(--font-title);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.4px;
  color: #121214;
  line-height: 1.25;
  margin-bottom: 10px;
  min-height: 38px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.pack-item-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  border-top: 1.5px dashed #cbd5e1;
  gap: 8px;
}

.pack-item-slot-label {
  font-family: var(--font-body);
  font-weight: 800;
  color: var(--text-main);
  font-size: 1.15rem;
  white-space: nowrap;
}

.pack-add-btn {
  padding: 8px 16px;
  background: #121214;
  color: #ffffff;
  border: 1.5px solid #121214;
  box-shadow: 2px 2px 0px #121214;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 1.15rem;
  font-weight: 800;
  text-align: center;
  cursor: pointer;
  transition: transform 0.1s, background 0.1s, box-shadow 0.1s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  white-space: nowrap;
}

.pack-add-btn:hover:not(:disabled) {
  background: #9333ea;
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px #121214;
}

.pack-add-btn:active:not(:disabled) {
  transform: translate(1px, 1px);
  box-shadow: 1px 1px 0px #121214;
}

.pack-add-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  background: #94a3b8;
  border-color: #64748b;
  box-shadow: none;
}

/* ==========================================================================
   STAGE 3: STICKY TOP CAPACITY TRACKER BAR (MOBILE SCROLL)
   ========================================================================== */
.crate-sticky-tracker-bar {
  display: none; /* Hidden on desktop because left sidebar is visible */
}

@media (max-width: 768px) {
  .crate-sticky-tracker-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    position: sticky;
    top: 86px; /* Sticks with a clean 14px gap below top navbar */
    z-index: 950;
    background: #ffffff;
    border: 2px solid #121214;
    box-shadow: 0 4px 0px #121214;
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    margin: 10px 0 16px;
    width: 100%;
    box-sizing: border-box;
    backdrop-filter: blur(8px);
    transition: top 0.2s ease;
  }

  .sticky-tracker-left {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
  }

  .sticky-tracker-badge {
    font-family: var(--font-title);
    font-size: 1.05rem;
    font-weight: 900;
    color: #121214;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .sticky-tracker-price {
    font-size: 1.15rem;
    font-weight: 900;
    color: #9333ea;
  }

  .sticky-tracker-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
    min-width: 125px;
  }

  .sticky-tracker-slots {
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 800;
    color: #121214;
  }

  .sticky-tracker-track {
    width: 125px;
    height: 11px;
    background: #f1f5f9;
    border: 1.5px solid #121214;
    border-radius: 2px;
    overflow: hidden;
    box-shadow: inset 1px 1px 0px rgba(0,0,0,0.1);
  }

  .sticky-tracker-fill {
    height: 100%;
    width: 0%;
    background: #9333ea;
    background-image: repeating-linear-gradient(90deg, #9333ea 0px, #9333ea 8px, #7e22ce 8px, #7e22ce 10px);
    transition: width 0.25s steps(10);
  }

  .sticky-tracker-fill.full {
    background: #10b981;
    background-image: repeating-linear-gradient(90deg, #10b981 0px, #10b981 8px, #059669 8px, #059669 10px);
  }

  /* Single-column packing workspace on mobile & tablet */
  .pack-workspace-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-width: 0;
    max-width: 100%;
    width: 100%;
  }

  .pack-catalog-wrap {
    min-width: 0;
    max-width: 100%;
    width: 100%;
    overflow: hidden;
  }

  .pack-catalog-header {
    max-width: 100%;
    margin-bottom: 12px;
  }

  /* Compact Crate Preview Panel on Mobile */
  .crate-preview-panel {
    padding: 10px 12px;
    gap: 8px;
    margin-bottom: 12px;
    position: static;
    min-width: 0;
    max-width: 100%;
    width: 100%;
    box-sizing: border-box;
  }

  /* Redundant on mobile because .crate-sticky-tracker-bar displays tier, price, and animated progress fill right above */
  .crate-preview-panel > div:first-child,
  .crate-preview-panel .crate-capacity-bar-wrap {
    display: none;
  }

  /* Hide empty box on mobile so catalog loot appears right below sticky tracker */
  .crate-preview-panel.crate-empty-mobile {
    display: none;
  }

  .crate-preview-panel h4 {
    font-size: 1.05rem !important;
    margin: 0 !important;
  }

  .packed-items-slots {
    max-height: 120px;
    gap: 6px;
  }

  .slot-item-card {
    padding: 6px 8px;
    gap: 8px;
  }

  .slot-item-thumb {
    width: 32px;
    height: 32px;
  }

  .slot-item-name {
    font-size: 1rem;
  }

  .slot-item-cat {
    font-size: 0.85rem;
  }

  /* Compact Horizontal Category Filter Tabs */
  .pack-cat-tabs {
    display: flex;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding-bottom: 6px;
    gap: 6px;
    width: 100%;
    max-width: 100%;
    min-width: 0;
  }

  .pack-cat-tab-btn {
    padding: 6px 12px;
    font-size: 1.05rem;
    flex-shrink: 0;
    white-space: nowrap;
  }

  /* Compact 2-column pack items grid on Mobile */
  .pack-items-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
    gap: 10px;
    width: 100% !important;
    max-width: 100% !important;
    min-width: 0;
  }

  .pack-item-card {
    min-width: 0;
    max-width: 100%;
    box-sizing: border-box;
    padding: 8px 8px 10px;
    border: 1.5px solid #121214;
    box-shadow: 2px 2px 0px #121214;
  }

  .pack-item-thumb {
    padding: 6px;
    margin-bottom: 6px;
    border-width: 1px;
  }

  .pack-item-category {
    font-size: 0.78rem;
    margin-bottom: 2px;
  }

  .pack-item-title {
    font-size: 1.05rem;
    min-height: 32px;
    margin-bottom: 6px;
    line-height: 1.25;
  }

  .pack-item-footer {
    padding-top: 6px;
    gap: 4px;
  }

  .pack-item-slot-label {
    font-size: 0.95rem;
  }

  .pack-add-btn {
    padding: 6px 10px;
    font-size: 0.95rem;
    gap: 4px;
  }
}

@media (max-width: 600px) {
  .crate-sticky-tracker-bar {
    top: 78px; /* 12px-14px clean gap below 66px navbar */
    margin: 8px 0 14px;
  }
}

@media (max-width: 440px) {
  .crate-sticky-tracker-bar {
    top: 72px; /* 12px clean gap below 60px navbar */
    margin: 6px 0 12px;
    padding: 7px 10px;
  }
  .sticky-tracker-badge {
    font-size: 0.95rem;
  }
  .sticky-tracker-price {
    font-size: 1.05rem;
  }
  .sticky-tracker-slots {
    font-size: 0.88rem;
  }
  .sticky-tracker-track {
    width: 110px;
  }
}

/* ==========================================================================
   STAGE 4: SLEEVE SELECTION STYLES
   ========================================================================== */
.sleeve-styles-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 980px;
  margin: 30px auto 0;
}

.sleeve-card {
  background: #ffffff;
  border: var(--border-pixel);
  box-shadow: var(--shadow-pixel);
  border-radius: var(--radius-sm);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  transition: transform 0.12s, box-shadow 0.12s, border-color 0.12s, background 0.12s;
  box-sizing: border-box;
}

.sleeve-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0px #9333ea;
}

.sleeve-card.selected {
  background: #faf5ff;
  border-color: #121214;
  box-shadow: 4px 4px 0px #9333ea;
  outline: 2.5px solid #9333ea;
  outline-offset: 2px;
}

.sleeve-preview-box {
  font-size: 2.8rem;
  margin-bottom: 12px;
}

@media (max-width: 900px) {
  .sleeve-styles-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    max-width: 580px;
  }
}

@media (max-width: 640px) {
  .sleeve-styles-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    max-width: 440px;
    margin: 16px auto 0;
  }

  .sleeve-card {
    padding: 12px 8px 14px;
    border: 2px solid #121214;
    box-shadow: 3px 3px 0px #121214;
    min-height: 130px;
  }

  .sleeve-preview-box {
    font-size: 2rem;
    margin-bottom: 6px;
  }

  .sleeve-card h4 {
    font-size: 1.05rem !important;
    line-height: 1.25;
    margin-bottom: 2px;
  }

  .sleeve-card p {
    font-size: 0.85rem !important;
    line-height: 1.25;
    margin: 0 !important;
  }
}

/* ==========================================================================
   STICKY BOTTOM ACTION BAR
   ========================================================================== */
.builder-bottom-bar {
  position: sticky;
  bottom: 0;
  z-index: 998;
  background: #ffffff;
  border-top: var(--border-pixel-thick);
  box-shadow: 0 -4px 0px rgba(18, 18, 20, 0.08);
  padding: 18px 0;
}

.builder-bottom-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.builder-total-price {
  font-family: var(--font-title);
  font-size: 2rem;
  font-weight: 900;
  color: #121214;
}

.builder-actions-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* Responsive */
@media (max-width: 992px) {
  .pack-workspace-grid {
    grid-template-columns: 1fr;
    min-width: 0;
    max-width: 100%;
  }
}

@media (max-width: 680px) {
  .builder-layout {
    padding: 20px 0 120px;
  }
  .builder-stepper {
    gap: 8px;
    margin-bottom: 28px;
    flex-wrap: nowrap;
    overflow-x: auto;
    justify-content: flex-start;
    padding: 4px 6px 12px;
    -webkit-overflow-scrolling: touch;
  }
  .stepper-step {
    padding: 8px 12px;
    gap: 6px;
    font-size: 1.05rem;
    flex-shrink: 0;
  }
  .stepper-step > span:not(.step-circle) {
    display: none;
  }
  .stepper-step.active > span:not(.step-circle) {
    display: inline-block;
  }
  .step-circle {
    width: 28px;
    height: 28px;
    font-size: 1rem;
  }
  .tier-card {
    padding: 24px 18px;
  }
}

/* ==========================================================================
   FLOATING VIEWPORT BOTTOM NAVIGATION CONTROLS (Bottom-Left & Bottom-Right)
   ========================================================================== */
.builder-floating-nav {
  position: fixed;
  bottom: 28px;
  left: 32px;
  right: 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
  z-index: 9999;
}

.builder-nav-btn {
  pointer-events: auto;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-size: 1.35rem;
  font-weight: 900;
  border-radius: var(--radius-sm);
  cursor: pointer;
  letter-spacing: 0.5px;
  user-select: none;
  transition: transform 0.18s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.18s cubic-bezier(0.16, 1, 0.3, 1),
              background-color 0.18s ease,
              opacity 0.22s ease;
}

.builder-btn-prev {
  background: #ffffff;
  color: #121214;
  border: 2px solid #121214;
  box-shadow: 4px 4px 0px #121214;
}

.builder-btn-prev:hover {
  background: #f1f5f9;
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0px #121214;
}

.builder-btn-prev:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0px #121214;
}

.builder-btn-prev.hidden-step {
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
}

.builder-btn-next {
  margin-left: auto; /* Guarantees flush anchor to bottom-right */
  background: #9333ea;
  color: #ffffff;
  border: 2px solid #121214;
  box-shadow: 4px 4px 0px #121214;
}

.builder-btn-next:hover {
  background: #a855f7;
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0px #121214;
}

.builder-btn-next:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0px #121214;
}

@media (max-width: 640px) {
  .builder-floating-nav {
    bottom: 16px;
    left: 14px;
    right: 14px;
  }
  .builder-nav-btn {
    padding: 12px 18px;
    font-size: 1.15rem;
    gap: 8px;
  }
}

@media (max-width: 380px) {
  .builder-floating-nav {
    bottom: 12px;
    left: 8px;
    right: 8px;
  }
  .builder-nav-btn {
    padding: 10px 14px;
    font-size: 1.05rem;
    gap: 6px;
  }
}