/* CSS Variables for a clean, premium light-theme palette */
:root {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /* Color Palette (High Contrast, Accessible, Light Theme) */
  --bg-app: #f8fafc;          /* Very light cool gray */
  --bg-card: #ffffff;         /* Pure white */
  --text-main: #0f172a;       /* Dark slate (almost black) for text */
  --text-muted: #475569;      /* Medium slate for secondary text */
  --border-color: #cbd5e1;    /* Clear gray border */
  --border-focus: #2563eb;    /* Royal blue for active focus */
  
  /* Interactive Accent Colors */
  --color-primary: #2563eb;   /* Premium blue */
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #eff6ff;
  
  --color-success: #16a34a;   /* Forest green for positive actions / PDF */
  --color-success-hover: #15803d;
  --color-success-light: #f0fdf4;
  
  --color-danger: #dc2626;    /* Red for warnings/delete */
  --color-danger-hover: #b91c1c;
  --color-danger-light: #fef2f2;
  
  --color-warning: #d97706;   /* Amber for reset options */
  --color-warning-light: #fffbeb;
  
  /* Shadow & Radius defaults */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.08);
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 40px;
}

/* Main Container Layout */
.app-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Non-sticky Top Bar Design */
.top-bar-container {
  background-color: var(--bg-card);
  border-bottom: 2px solid var(--border-color);
  padding: 16px 0;
}

.top-bar-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.app-main-title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: var(--text-main);
}

/* Header Design (Sticky Running Totals Bar) */
.app-header {
  background-color: var(--bg-card);
  border-bottom: 3px solid var(--text-main); /* Thick high-contrast border */
  padding: 12px 0;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
}

.header-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: center; /* Center the stats in the middle */
  align-items: center;
  width: 100%;
  gap: 32px; /* Distinct gap around the divider */
}

.header-separator {
  font-size: 24px;
  font-weight: 700;
  color: var(--border-color);
  user-select: none;
}

.header-stat-left,
.header-stat-right {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.header-stat-label {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-muted);
}

.header-stat-val {
  font-size: 28px;
  font-weight: 800;
  color: var(--color-primary);
}

.header-stat-right .header-stat-val {
  color: var(--color-success); /* Ton counter in green */
}

/* Buttons Styles */
button {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 16px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  min-height: 48px; /* High accessibility touch target */
}

button:active {
  transform: scale(0.97);
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.btn-large {
  font-size: 18px;
  padding: 16px 28px;
  border-radius: var(--radius-md);
  width: 100%;
}

.btn-secondary {
  background-color: #ffffff;
  color: var(--text-main);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-app);
  border-color: var(--text-muted);
}

.btn-danger-outline {
  background-color: #ffffff;
  color: var(--color-danger);
  border: 2px solid var(--color-danger);
}

.btn-danger-outline:hover {
  background-color: var(--color-danger-light);
}

.btn-warning-outline {
  background-color: #ffffff;
  color: var(--color-warning);
  border: 2px solid var(--color-warning);
}

.btn-warning-outline:hover {
  background-color: var(--color-warning-light);
}

.icon-btn {
  width: 20px;
  height: 20px;
}

/* Layout Grid */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 32px;
  align-items: start;
}

/* Items Section */
.items-section {
  background-color: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-md);
}

.section-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--bg-app);
  color: var(--text-main);
}

/* Stock Rows */
.stock-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stock-item-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background-color: var(--bg-app);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  transition: border-color 0.2s, background-color 0.2s;
}

.stock-item-row.has-qty {
  border-color: var(--color-primary);
  background-color: var(--color-primary-light);
}

.item-name {
  font-size: 20px; /* Big, easily readable text */
  font-weight: 700;
  color: var(--text-main);
}

/* Quantity Control Widget */
.quantity-widget {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-qty {
  width: 52px;
  height: 52px;
  border-radius: 50%; /* Circle buttons are very friendly */
  border: 2px solid var(--border-color);
  background-color: #ffffff;
  font-size: 24px;
  font-weight: bold;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  box-shadow: var(--shadow-sm);
  padding: 0;
}

.btn-qty:hover {
  background-color: var(--bg-app);
  border-color: var(--text-muted);
}

.btn-qty.btn-minus {
  color: var(--color-danger);
}

.btn-qty.btn-plus {
  color: var(--color-primary);
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
}

.btn-qty.btn-plus:hover {
  background-color: #dbeafe;
}

.qty-input {
  width: 90px;
  height: 52px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  text-align: center;
  font-size: 24px;
  font-weight: 700;
  color: var(--text-main);
  background-color: #ffffff;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.qty-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

/* Hide standard HTML number input arrows */
.qty-input::-webkit-outer-spin-button,
.qty-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
.qty-input[type=number] {
  -moz-appearance: textfield;
}

/* Summary Card */
.summary-section {
  position: sticky;
  top: 98px; /* Sticks below the header */
}

.summary-card {
  background-color: var(--bg-card);
  border: 3px solid var(--text-main); /* Thick high-contrast border */
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-lg);
}

.summary-title {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--border-color);
}

.totals-grid {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 24px;
}

.total-box {
  display: flex;
  flex-direction: column;
  padding: 16px;
  border-radius: var(--radius-md);
  background-color: var(--bg-app);
  border: 2px solid var(--border-color);
}

.total-box.highlight {
  background-color: var(--color-success-light);
  border-color: var(--color-success);
}

.total-label {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.total-box.highlight .total-label {
  color: var(--color-success-hover);
}

.total-val {
  font-size: 32px;
  font-weight: 800;
  color: var(--text-main);
}

.total-box.highlight .total-val {
  color: var(--color-success-hover);
}

/* Live Selected List Preview */
.added-preview {
  margin-bottom: 24px;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  background-color: var(--bg-app);
  max-height: 250px;
  overflow-y: auto;
}

.added-preview h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.selected-items-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.selected-items-list li {
  display: flex;
  justify-content: space-between;
  font-size: 16px;
  font-weight: 600;
  padding: 8px 12px;
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.selected-items-list li .preview-name {
  color: var(--text-main);
}

.selected-items-list li .preview-qty {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  padding: 2px 8px;
  border-radius: 20px;
  font-weight: 700;
}

.selected-items-list .empty-state {
  display: block;
  text-align: center;
  color: var(--text-muted);
  border: none;
  background: none;
  font-size: 14px;
  font-style: italic;
  padding: 12px 0;
}

.action-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Download PDF Button (Matches the primary blue of the + button) */
#btn-export-pdf {
  background-color: var(--color-primary);
  color: #ffffff;
  border: none;
}

#btn-export-pdf:hover {
  background-color: var(--color-primary-hover);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* Modal Overlay Styling */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.6); /* Semi-transparent dark overlay */
  backdrop-filter: blur(4px); /* Modern blur effect */
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease-out;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background-color: var(--bg-card);
  width: 90%;
  max-width: 580px;
  max-height: 85vh;
  border-radius: var(--radius-lg);
  border: 3px solid var(--text-main);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  transform: translateY(20px);
  transition: transform 0.2s ease-out;
}

.modal-overlay.open .modal-content {
  transform: translateY(0);
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 2px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
}

.btn-close-x {
  background: none;
  border: none;
  font-size: 32px;
  font-weight: 300;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  min-height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-close-x:hover {
  color: var(--color-danger);
}

.modal-body {
  padding: 20px 24px;
  overflow-y: auto;
  flex-grow: 1;
}

.modal-instruction {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.4;
}

/* Edit Prices List */
.price-edit-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.price-edit-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background-color: var(--bg-app);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

.price-item-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
}

.price-input-container {
  display: flex;
  align-items: center;
  position: relative;
}

.currency-symbol {
  position: absolute;
  left: 12px;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-muted);
}

.price-input {
  width: 140px;
  height: 44px;
  padding-left: 28px;
  padding-right: 12px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  font-size: 18px;
  font-weight: 700;
  text-align: right;
  color: var(--text-main);
}

.price-input:focus {
  border-color: var(--border-focus);
  outline: none;
}

.modal-footer {
  padding: 20px 24px;
  border-top: 2px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-app);
  border-bottom-left-radius: var(--radius-lg);
  border-bottom-right-radius: var(--radius-lg);
  flex-wrap: wrap;
  gap: 12px;
}

.footer-actions-right {
  display: flex;
  gap: 12px;
}

/* Responsive adjustments */
@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  
  .summary-section {
    position: static;
    margin-top: 16px;
  }
}

@media (max-width: 480px) {
  .header-content {
    justify-content: center;
    text-align: center;
  }
  
  .stock-item-row {
    flex-direction: column;
    gap: 16px;
    align-items: stretch;
  }
  
  .quantity-widget {
    justify-content: space-between;
  }
  
  .qty-input {
    flex-grow: 1;
  }
  
  .modal-footer {
    flex-direction: column;
    align-items: stretch;
  }
  
  .footer-actions-right {
    flex-direction: column;
  }
  
  .btn-warning-outline {
    order: 3;
  }
}

/* Bulk Adjust Box inside Modal */
.bulk-adjust-card {
  background-color: var(--bg-app);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  margin-bottom: 20px;
}

.bulk-title {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 10px;
}

.bulk-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.bulk-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.bulk-input-field {
  width: 90px;
  height: 44px;
  padding-left: 24px;
  padding-right: 8px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-color);
  font-size: 16px;
  font-weight: 700;
  text-align: right;
  color: var(--text-main);
}

.bulk-input-field:focus {
  border-color: var(--border-focus);
  outline: none;
}

.btn-sm {
  min-height: 44px;
  padding: 8px 16px;
  font-size: 15px;
}

.bulk-presets {
  display: flex;
  gap: 8px;
}

.btn-preset {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  min-height: 44px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-preset:hover {
  background-color: var(--color-primary);
  color: #ffffff;
}

.bulk-note {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
}

/* Button layout & WhatsApp Green button */
.button-row {
  display: flex;
  gap: 12px;
  width: 100%;
}

.button-row button {
  flex: 1;
  min-height: 48px;
  font-size: 15px;
  font-weight: 700;
}

.btn-share {
  background-color: var(--color-success);
  color: #ffffff;
}

.btn-share:hover {
  background-color: var(--color-success-hover);
  box-shadow: 0 4px 12px rgba(22, 163, 74, 0.3);
}

/* PWA Installation Prompt (Glassmorphism & High Contrast) */
.pwa-prompt {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(0);
  z-index: 1000;
  width: 90%;
  max-width: 450px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px) saturate(190%);
  -webkit-backdrop-filter: blur(12px) saturate(190%);
  border: 3px solid var(--text-main);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s ease;
  opacity: 1;
}

.pwa-prompt.hidden {
  transform: translateX(-50%) translateY(120%);
  opacity: 0;
  pointer-events: none;
}

.pwa-prompt-content {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  flex-wrap: wrap;
}

.pwa-prompt-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  border: 2px solid var(--text-main);
  box-shadow: var(--shadow-sm);
}

.pwa-prompt-text {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.pwa-prompt-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--text-main);
}

.pwa-prompt-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
}

.pwa-prompt-actions {
  display: flex;
  width: 100%;
  gap: 8px;
  margin-top: 8px;
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
}

.pwa-prompt-actions button {
  flex: 1;
  min-height: 40px;
  font-size: 14px;
  font-weight: 700;
  border-radius: var(--radius-sm);
}

.pwa-btn-secondary {
  background-color: transparent;
  color: var(--text-muted);
  border: 2px dashed var(--border-color);
}

.pwa-btn-secondary:hover {
  background-color: var(--color-danger-light);
  color: var(--color-danger);
  border-color: var(--color-danger);
}

.pwa-btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  border: 2px solid var(--color-primary);
}

.pwa-btn-primary:hover {
  background-color: var(--color-primary-hover);
}