@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&display=swap');

/* ==========================================================================
   1. Design System & Base Variables
   ========================================================================== */
:root {
  --color-bg-deep: #F8FAFC;
  --color-bg-card: #FFFFFF;
  --color-bg-input: #FFFFFF;
  --color-border: #E2E8F0;
  --color-text-primary: #0F172A;
  --color-text-secondary: #334155;
  --color-text-muted: #64748B;
  
  --color-purple: #8B5CF6;
  --color-purple-hover: #7C3AED;
  --color-purple-glow: rgba(139, 92, 246, 0.15);
  
  --color-emerald: #10B981;
  --color-emerald-hover: #059669;
  --color-emerald-glow: rgba(16, 185, 129, 0.15);
  
  --color-rose: #EF4444;
  --color-rose-hover: #DC2626;
  --color-rose-glow: rgba(239, 68, 68, 0.15);
  
  --color-amber: #F59E0B;
  --color-amber-glow: rgba(245, 158, 11, 0.15);
  
  --font-main: 'Outfit', sans-serif;
  --header-height: 44px;
  --footer-height: 76px;
  --border-radius-lg: 8px;
  --border-radius-md: 8px;
  --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   2. Reset & Core Layout
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Outfit', sans-serif;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  font-family: var(--font-main);
  background-color: var(--color-bg-deep);
  color: var(--color-text-primary);
  height: 100dvh;
  width: 100%;
  overflow: hidden;
  position: fixed;
  overscroll-behavior: none;
  touch-action: manipulation;
}

/* Scrollbar Hiding */
.scroll-container {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
  height: calc(100% - var(--header-height));
  padding-bottom: 90px;
}
.scroll-container::-webkit-scrollbar {
  display: none;
}

/* Helper Utilities */
.hidden {
  display: none !important;
}

.w-full {
  width: 100% !important;
}

.flex-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* ==========================================================================
   3. Responsive Media Queries (Mobile First Grid)
   ========================================================================== */
.mobile-container {
  display: flex;
  flex-direction: column;
  position: relative;
  width: 100%;
  height: 100dvh;
  max-width: 480px;
  margin: 0 auto;
  background-color: var(--color-bg-deep);
  border-left: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  overflow: hidden;
}

.desktop-gateway {
  display: none;
}

@media (min-width: 481px) {
  body {
    background-color: #F1F5F9;
  }
}

/* Show Desktop View on Large Screens */
@media (min-width: 900px) {
  .mobile-container {
    display: none;
  }
  .desktop-gateway {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100vw;
    height: 100vh;
    background-color: #F1F5F9;
    padding: 2rem;
  }
  
  .desktop-card {
    max-width: 500px;
    background-color: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 3rem;
    text-align: center;
    box-shadow: 0 10px 15px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -4px rgba(15, 23, 42, 0.05);
  }
  
  .desktop-header h1 {
    font-size: 0.85rem;
    font-weight: 900;
    letter-spacing: 0.4em;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    margin-bottom: 0.5rem;
  }
  
  .desktop-header h2 {
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
    margin-bottom: 1.5rem;
  }
  
  .desktop-desc {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
  }
}

/* ==========================================================================
   4. Header & Top Nav
   ========================================================================== */
.app-header {
  height: var(--header-height);
  background-color: #0F172A;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  position: relative;
  z-index: 100;
  width: 100%;
}

.header-view {
  display: none;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 1.25rem;
  width: 100%;
}

.header-view.active {
  display: flex;
}

.header-left, .header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 80px;
}

.header-right {
  justify-content: flex-end;
}

.header-title {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: max-content;
  max-width: calc(100% - 100px);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #FFFFFF;
  text-align: center;
  pointer-events: none;
}

.icon-btn {
  background: none;
  border: none;
  color: #FFFFFF;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.icon-btn:active {
  background-color: var(--color-border);
  transform: scale(0.92);
}

/* Sync Indicator Status Dot */
.indicator-wrapper {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sync-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  transition: var(--transition-smooth);
}

.dot-green {
  background-color: var(--color-emerald);
  box-shadow: 0 0 10px var(--color-emerald);
}
.dot-blue {
  background-color: #3b82f6;
  box-shadow: 0 0 10px #3b82f6;
  animation: pulse-glow 1.5s infinite;
}
.dot-red {
  background-color: var(--color-rose);
  box-shadow: 0 0 10px var(--color-rose);
}
.dot-gray {
  background-color: var(--color-text-muted);
}

@keyframes pulse-glow {
  0% { transform: scale(1); opacity: 0.6; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(1); opacity: 0.6; }
}

/* Search Header Input */
.search-view {
  background-color: #0F172A;
  position: absolute;
  inset: 0;
  z-index: 110;
  transform: translateY(-100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
}

.search-view.active {
  transform: translateY(0);
}

.search-input {
  flex: 1;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  border-radius: var(--border-radius-md);
  padding: 0.75rem 1rem;
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 600;
  outline: none;
  transition: var(--transition-smooth);
}

.search-input:focus {
  border-color: var(--color-purple);
  box-shadow: 0 0 0 2px var(--color-purple-glow);
}

/* ==========================================================================
   5. Page Navigation & home views
   ========================================================================== */
.page-view {
  display: none;
  flex: 1;
  width: 100%;
  height: calc(100% - var(--header-height));
  position: relative;
}

.page-view.active {
  display: flex;
  flex-direction: column;
}

/* Home Panel (Hero Layout) */
.home-hero {
  flex: 1.2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
}

.hero-icon-bg {
  width: 96px;
  height: 96px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1) 0%, rgba(139, 92, 246, 0.03) 100%);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
  transform: rotate(-6deg);
  margin-bottom: 1.5rem;
}

.hero-icon {
  font-size: 3rem;
  transform: rotate(6deg);
}

.hero-title {
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
}

.hero-desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  font-weight: 600;
}

.home-actions {
  flex: 1;
  width: 100%;
  padding: 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  justify-content: flex-start;
}

.btn-quiet {
  width: 100%;
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-family: var(--font-main);
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 0.85rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  text-align: center;
}

.btn-quiet:active {
  color: var(--color-purple);
  transform: scale(0.97);
}

.version-footer {
  padding: 1.5rem 0 3.5rem 0;
  text-align: center;
}

.exit-link {
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: var(--transition-smooth);
  cursor: pointer;
}

.exit-link:hover, .exit-link:active {
  color: var(--color-purple);
}

/* Buttons */
.btn-primary-gradient {
  background: linear-gradient(135deg, var(--color-purple) 0%, var(--color-purple-hover) 100%);
  border: none;
  border-radius: var(--border-radius-lg);
  padding: 1.25rem;
  width: 100%;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 20px -5px rgba(139, 92, 246, 0.4);
  transition: var(--transition-smooth);
}

/* Start Count Button Loading Bar Indicator */
.button-loading-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background-color: rgba(255, 255, 255, 0.1);
  overflow: hidden;
  transition: var(--transition-smooth);
}

.button-loading-bar::after {
  content: '';
  position: absolute;
  top: 0;
  left: -50%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, #10B981, #34d399, transparent);
  transition: var(--transition-smooth);
}

.button-loading-bar.loading::after {
  animation: button-loading-slide 1.5s infinite linear;
}

.button-loading-bar.loaded {
  background-color: #10B981;
  box-shadow: 0 0 10px rgba(16, 185, 129, 0.8);
}

.button-loading-bar.loaded::after {
  display: none;
}

.button-loading-bar.error {
  background-color: #EF4444;
  box-shadow: 0 0 10px rgba(239, 68, 68, 0.8);
}

.button-loading-bar.error::after {
  display: none;
}

.button-loading-bar.idle {
  background-color: rgba(255, 255, 255, 0.1);
}

.button-loading-bar.idle::after {
  display: none;
}

@keyframes button-loading-slide {
  0% {
    left: -50%;
  }
  100% {
    left: 100%;
  }
}

.btn-primary-gradient:active {
  transform: scale(0.97);
  box-shadow: 0 5px 10px -2px rgba(139, 92, 246, 0.4);
}

.btn-gradient-content {
  position: relative;
  z-index: 5;
  color: #fff;
  font-size: 1.2rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--color-purple);
  color: #fff;
  border: none;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.02em;
  padding: 1.15rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-primary:active {
  background-color: var(--color-purple-hover);
  transform: scale(0.97);
}

.btn-success {
  background-color: var(--color-emerald);
  color: #fff;
  border: none;
  font-weight: 800;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  padding: 1.15rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 16px -4px var(--color-emerald-glow);
}
.btn-success:active {
  background-color: var(--color-emerald-hover);
  transform: scale(0.97);
}

.sticky-footer {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1rem 1.25rem calc(1rem + env(safe-area-inset-bottom));
  background: linear-gradient(to top, var(--color-bg-deep) 80%, transparent);
  z-index: 50;
}

/* ==========================================================================
   6. Count List (Page 2) & Products Rendering
   ========================================================================== */
.brand-group-header {
  background-color: #FFFFFF;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-primary);
  font-weight: 800;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 0.85rem 1.25rem;
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.05);
}

.brand-badge {
  font-size: 0.65rem;
  background-color: #F1F5F9;
  border: 1px solid var(--color-border);
  padding: 0.15rem 0.5rem;
  border-radius: 50px;
  color: var(--color-text-secondary);
}

/* Product Card */
.product-card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  margin: 1rem 1.25rem;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
}

.product-info-row {
  padding: 1rem;
  display: flex;
  gap: 1rem;
  align-items: center;
}

.product-img {
  width: 80px;
  height: 80px;
  border-radius: var(--border-radius-md);
  object-cover: cover;
  background-color: var(--color-bg-deep);
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}

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

.sku-info-wrapper {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.product-sku {
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  margin: 0;
  line-height: 1.2;
}

.info-help-btn {
  background: none;
  border: none;
  color: var(--color-rose);
  padding: 0.35rem;
  cursor: pointer;
  font-size: 0.75rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.product-desc {
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text-secondary);
  margin-top: 0.15rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.yesterday-stock-tag {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--color-purple);
  margin-top: 0.25rem;
  letter-spacing: 0.02em;
}

/* Card Control Row */
.product-control-row {
  background-color: #F8FAFC;
  border-top: 1px solid var(--color-border);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.quantity-adjuster {
  display: flex;
  align-items: center;
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  padding: 2px;
  flex: 1;
  margin-right: 0.75rem;
  height: 44px;
}

.adjust-btn {
  background: none;
  border: none;
  width: 40px;
  height: 100%;
  color: var(--color-text-primary);
  font-size: 1.2rem;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 8px;
  transition: var(--transition-smooth);
}

.adjust-btn-minus {
  color: var(--color-rose);
  background-color: rgba(239, 68, 68, 0.05);
}
.adjust-btn-minus:active {
  background-color: rgba(239, 68, 68, 0.15);
}

.adjust-btn-plus {
  color: var(--color-emerald);
  background-color: rgba(16, 185, 129, 0.05);
}
.adjust-btn-plus:active {
  background-color: rgba(16, 185, 129, 0.15);
}

.quantity-input {
  flex: 1;
  width: 100%;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: 1.3rem;
  font-weight: 900;
  text-align: center;
  outline: none;
  font-family: var(--font-main);
  padding: 0;
  transition: var(--transition-smooth);
}

.quantity-input.out-of-stock {
  color: var(--color-amber);
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.quantity-input.scale-animation {
  transform: scale(1.15);
}

.card-calc-btn {
  width: 44px;
  height: 44px;
  background-color: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.2);
  color: var(--color-purple);
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  flex-shrink: 0;
}

.card-calc-btn:active {
  background-color: var(--color-purple);
  color: #fff;
  transform: scale(0.92);
}

/* Green flash on apply count */
.quantity-input.apply-flash {
  background-color: var(--color-emerald-glow) !important;
}

.card-skip-btn {
  height: 44px;
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  border-radius: var(--border-radius-md);
  padding: 0 1rem;
  font-family: var(--font-main);
  font-weight: 800;
  font-size: 0.85rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  flex-shrink: 0;
  margin-left: 0.5rem;
}

.card-skip-btn:active {
  background-color: var(--color-border);
  color: var(--color-text-primary);
  transform: scale(0.95);
}

.skip-badge {
  font-size: 0.65rem;
  background-color: rgba(139, 92, 246, 0.12);
  border: 1px solid rgba(139, 92, 246, 0.25);
  color: var(--color-purple);
  font-weight: 900;
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
  margin-left: 0.5rem;
  vertical-align: middle;
  letter-spacing: 0.05em;
  display: inline-block;
}

.summary-skipped-tag {
  font-size: 0.6rem;
  background-color: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.25);
  color: var(--color-amber);
  font-weight: 900;
  padding: 0.1rem 0.35rem;
  border-radius: 5px;
  margin-left: 0.5rem;
  vertical-align: middle;
  letter-spacing: 0.05em;
  display: inline-block;
}

/* ==========================================================================
   7. Summary Review Panel (Page 3)
   ========================================================================== */
.summary-header {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg-deep);
  text-align: center;
}

.summary-title {
  font-size: 9px;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
  margin: 0;
  line-height: 1.3;
}

.summary-remark {
  font-size: 9px;
  color: var(--color-text-secondary);
  font-weight: 400;
  margin-top: 0.15rem;
  line-height: 1.3;
}

.summary-list {
  padding-bottom: 2rem;
}

.summary-item {
  padding: 0.75rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  background-color: #FFFFFF;
}

.summary-item-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.summary-item-sku {
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.summary-item-dots {
  flex: 1;
  border-bottom: 2px dotted var(--color-border);
  margin: 0 0.5rem 0.35rem 0.5rem;
  opacity: 0.3;
}

.summary-item-qty {
  font-size: 1.05rem;
  font-weight: 900;
  text-align: right;
  text-transform: uppercase;
}

.qty-oos {
  color: var(--color-amber);
}

.qty-uncounted {
  color: var(--color-rose);
  background-color: rgba(239, 68, 68, 0.1);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.8rem;
}

.summary-item-bottom {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-top: 0.15rem;
}

.summary-item-desc {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  line-height: 1.3;
  flex: 1;
  padding-right: 1rem;
}

.summary-item-pack {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.pb-safe-large {
  padding-bottom: 120px;
}

/* Summary view brand checkbox filter */
.summary-brand-checkbox {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  margin-right: 0.75rem;
  appearance: none;
  outline: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.summary-brand-checkbox:checked {
  background-color: var(--color-purple);
  border-color: var(--color-purple);
}

.summary-brand-checkbox:checked::after {
  content: "\f00c";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  font-size: 0.6rem;
  color: white;
}

/* ==========================================================================
   8. Modal Overlays & Calculator Math View
   ========================================================================== */
.modal-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(9, 13, 26, 0.8);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  animation: fade-in 0.25s ease-out;
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

.modal-card {
  width: 100%;
  background-color: var(--color-bg-card);
  border-top: 1px solid var(--color-border);
  border-radius: 16px 16px 0 0;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: 0 -10px 25px rgba(15, 23, 42, 0.05);
  transform: translateY(0);
  animation: slide-up 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes slide-up {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.modal-header-tag {
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
}

.close-btn {
  background: rgba(255, 255, 255, 0.05);
  border: none;
  color: var(--color-text-primary);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.close-btn:active {
  background: var(--color-border);
  transform: scale(0.9);
}

/* Calculator Modal specific */
.calc-card {
  padding-bottom: calc(1.5rem + env(safe-area-inset-bottom));
}

.calc-logs-panel {
  height: 48px;
  overflow-y: auto;
  margin-bottom: 0.5rem;
  text-align: right;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  background-color: #F8FAFC;
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border);
}

#calcHistoryLog {
  color: var(--color-text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  line-height: 1.4;
  white-space: normal;
  max-width: 100%;
}

.calc-display-panel {
  text-align: right;
  margin-bottom: 1rem;
}

.calc-sku-tag {
  color: var(--color-purple);
  font-weight: 800;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.15rem;
}

.calc-formula {
  color: var(--color-text-secondary);
  font-size: 1.2rem;
  height: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.calc-result {
  font-size: 3.5rem;
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.calc-result.text-3xl {
  font-size: 1.8rem;
}

/* Grid Layout */
.calc-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.calc-key {
  height: 60px;
  border-radius: var(--border-radius-md);
  border: none;
  font-family: var(--font-main);
  font-size: 1.5rem;
  font-weight: 800;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
}

.calc-key:active {
  transform: scale(0.92);
}

.num-key {
  background-color: var(--color-bg-deep);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}
.num-key:active {
  background-color: var(--color-border);
}

.op-key {
  background-color: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.15);
  color: var(--color-purple);
}
.op-key:active {
  background-color: var(--color-purple);
  color: white;
}

.del-key {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--color-rose);
}
.del-key:active {
  background-color: var(--color-rose);
  color: white;
}

.clear-key {
  background-color: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: var(--color-rose);
}
.clear-key:active {
  background-color: var(--color-rose);
  color: white;
}

.eq-key {
  background-color: var(--color-purple);
  color: white;
}
.eq-key:active {
  background-color: var(--color-purple-hover);
}

.row-span-2 {
  grid-row: span 2;
  height: 100%;
}

.calc-apply-btn {
  margin-top: 0.5rem;
  width: 100%;
}

/* ==========================================================================
   9. Security PIN Modal
   ========================================================================== */
.pin-modal-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-top: -10vh;
  width: 100%;
}

.absolute-top-right {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 100;
}

.pin-lock-icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.pin-title {
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.pin-subtitle {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  font-weight: 600;
  margin-bottom: 3rem;
  text-align: center;
}

.pin-box-wrapper {
  display: flex;
  gap: 0.75rem;
  position: relative;
  width: 100%;
  max-width: 280px;
  justify-content: center;
}

.hidden-pin-input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  z-index: 10;
  cursor: pointer;
  background: transparent;
  color: transparent;
  border: none;
}

.pin-box {
  width: 56px;
  height: 72px;
  border: 2px solid var(--color-border);
  background-color: var(--color-bg-card);
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 900;
  color: white;
  transition: var(--transition-smooth);
}

.pin-box.active {
  border-color: var(--color-purple);
  background-color: rgba(139, 92, 246, 0.08);
  box-shadow: 0 0 12px var(--color-purple-glow);
}

.pin-box.error {
  border-color: var(--color-rose);
  background-color: rgba(239, 68, 68, 0.08);
  box-shadow: 0 0 12px var(--color-rose-glow);
}

/* Shake Animation on PIN error */
.shake-animation {
  animation: shake 0.35s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

/* ==========================================================================
   10. Custom Alert Modal
   ========================================================================== */
.alert-overlay {
  background-color: rgba(9, 13, 26, 0.6);
  align-items: center;
  padding: 2rem;
}

.alert-card {
  max-width: 320px;
  border-radius: 16px;
  border: 1px solid var(--color-border);
  align-items: center;
  text-align: center;
  padding: 1.5rem 1.5rem 2rem 1.5rem;
  animation: alert-pop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes alert-pop {
  from { transform: scale(0.9) translateY(10px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}

.alert-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 1rem;
}

.icon-blue {
  background-color: rgba(59, 130, 246, 0.1);
  color: #3b82f6;
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.icon-red {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--color-rose);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.icon-green {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--color-emerald);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-title {
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}

.alert-desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 1.5rem;
  white-space: pre-wrap;
}

/* ==========================================================================
   11. Fullscreen Image Preview
   ========================================================================== */
.fullscreen-image-wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.preview-img {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 12px;
  background-color: white;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
  margin-bottom: 2rem;
  border: 1px solid var(--color-border);
}

.preview-info-card {
  width: 100%;
  max-width: 320px;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.25rem;
  text-align: center;
}

.preview-sku {
  font-size: 1.6rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: white;
  margin-bottom: 0.25rem;
}

.preview-description {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--color-text-secondary);
}

.fab-pdf {
  position: absolute;
  bottom: 2rem;
  right: 1.5rem;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--color-purple);
  color: white;
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: 0 10px 20px -5px rgba(139, 92, 246, 0.5);
  cursor: pointer;
  z-index: 90;
  transition: var(--transition-smooth);
}

.fab-pdf:active {
  transform: scale(0.9);
  background-color: var(--color-purple-hover);
}