/* CSS Reset & Variable Tokens */
:root {
  --font-main: 'Inter', sans-serif;
  --font-display: 'Outfit', sans-serif;

  /* Color Palette - Monochrome Dark / Graphite */
  --bg-darker: #0d0e10;
  --bg-dark: #121316;
  --bg-card: rgba(22, 24, 28, 0.7);
  --bg-card-hover: rgba(30, 32, 38, 0.85);
  --border-color: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);

  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #4b5563;

  /* Soft Pastel/Neon Orange Gradient Accent */
  --dodo-orange: #ff7300;
  --dodo-orange-light: #ff9e3b;
  --dodo-orange-grad: linear-gradient(135deg, #ff7300, #ff9e3b);
  --dodo-orange-glow: rgba(255, 115, 0, 0.25);

  /* Vkusno i Tochka Green Gradient Accent */
  --vkusno-green: #0a5f38;
  --vkusno-green-light: #158f55;
  --vkusno-green-grad: linear-gradient(135deg, #0a5f38, #158f55);
  --vkusno-green-glow: rgba(10, 95, 56, 0.25);
  --vkusno-orange: #ff5800;

  /* Dynamic Brand Accent variables */
  --brand-accent: var(--dodo-orange);
  --brand-accent-light: var(--dodo-orange-light);
  --brand-accent-grad: var(--dodo-orange-grad);
  --brand-accent-glow: var(--dodo-orange-glow);

  --amber: #f59e0b;
  --red: #ef4444;
  --green: #10b981;
  --blue: #3b82f6;

  /* Shadows & Glassmorphism 2.0 */
  --glass-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.5);
  --blur-value: 20px;
  
  --transition-smooth: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-elastic: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-darker);
  color: var(--text-primary);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.5;
}

/* Background Glowing Elements */
.bg-glow {
  position: absolute;
  width: 60vw;
  height: 60vw;
  border-radius: 50%;
  filter: blur(120px);
  z-index: -1;
  opacity: 0.08;
  pointer-events: none;
}

.bg-glow-1 {
  background: radial-gradient(circle, var(--brand-accent) 0%, transparent 70%);
  top: -20vw;
  right: -10vw;
}

.bg-glow-2 {
  background: radial-gradient(circle, var(--blue) 0%, transparent 70%);
  bottom: -15vw;
  left: -10vw;
}

/* Glassmorphism 2.0 */
.glass {
  background: var(--bg-card);
  backdrop-filter: blur(var(--blur-value));
  -webkit-backdrop-filter: blur(var(--blur-value));
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--glass-shadow);
  transition: var(--transition-smooth);
}

.glass:hover {
  border-color: var(--border-hover);
}

/* GLOBAL MOBILE-FIRST MAIN CONTAINER */
#app {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-main);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 18px;
  height: 46px; /* Touch target */
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-smooth);
}

.btn-primary {
  background: var(--brand-accent-grad);
  color: #fff;
  box-shadow: 0 4px 14px var(--brand-accent-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--brand-accent-glow), 0 0 0 2px rgba(255, 255, 255, 0.05);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-hover);
}

.btn-icon {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  border-color: var(--border-color);
  padding: 0;
  width: 46px;
  height: 46px;
  border-radius: 12px;
}

.btn-icon:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border-hover);
}

/* APP HEADER */
.app-header {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 18px;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  background: var(--brand-accent-grad);
  color: #fff;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  font-size: 20px;
  box-shadow: 0 4px 12px var(--brand-accent-glow);
}

.logo-text h1 {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.1;
}

.logo-text p {
  font-size: 11px;
  color: var(--text-secondary);
}

.accent-text {
  background: var(--brand-accent-grad);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
}

.header-actions #add-product-btn {
  flex: 1;
}

/* METRICS CONTROLS BLOCK */
.metrics-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  padding: 12px 0;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.control-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-item label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

/* Stepper Input */
.stepper-input {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  overflow: hidden;
  height: 46px; /* Touch target */
}

.stepper-input button {
  background: transparent;
  border: none;
  color: var(--text-primary);
  width: 44px;
  height: 100%;
  font-size: 18px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.stepper-input button:hover {
  background: rgba(255, 255, 255, 0.06);
}

.stepper-input input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  text-align: center;
  font-size: 16px;
  font-weight: 700;
  outline: none;
  width: 60px;
}

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

/* "Satiated Student" Calculator Box */
.student-inputs {
  display: flex;
  gap: 8px;
}

.student-inputs input {
  flex: 1;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 0 14px;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 16px;
  font-weight: 600;
  outline: none;
  height: 46px; /* Touch target */
  transition: var(--transition-smooth);
}

.student-inputs input:focus {
  border-color: var(--brand-accent);
  background: rgba(255, 255, 255, 0.06);
}

.student-inputs select {
  flex: 1;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 0 14px;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 14px;
  font-weight: 500;
  outline: none;
  height: 46px; /* Touch target */
  cursor: pointer;
  transition: var(--transition-smooth);
}

/* NAVIGATION & CATEGORIES (MOBILE HORIZONTAL SCROLL) */
.navigation-bar {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.category-nav {
  display: flex;
  overflow-x: auto;
  white-space: nowrap;
  gap: 8px;
  padding: 4px 0;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Hide scrollbar for Firefox */
}

.category-nav::-webkit-scrollbar {
  display: none; /* Hide scrollbar for Chrome/Safari */
}

.category-tab {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.category-tab:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.category-tab.active {
  background: var(--brand-accent-grad);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 10px var(--brand-accent-glow);
}

/* Minimal Search Box in Nav */
.navigation-bar .search-box {
  position: relative;
  display: flex;
  align-items: center;
  border-radius: 12px;
  width: 100%;
}

.navigation-bar .search-box i {
  position: absolute;
  left: 14px;
  color: var(--text-secondary);
}

.navigation-bar .search-box input {
  width: 100%;
  background: transparent;
  border: none;
  padding: 12px 14px 12px 38px;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 14px;
  height: 44px;
  outline: none;
}

/* DROPDOWN */
.dropdown {
  position: relative;
  display: inline-block;
}

.dropdown-content {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 180px;
  z-index: 50;
  overflow: hidden;
  padding: 6px;
}

.dropdown:hover .dropdown-content {
  display: block;
}

.dropdown-content a {
  color: var(--text-primary);
  padding: 10px 14px;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  border-radius: 8px;
  transition: var(--transition-smooth);
}

.dropdown-content a:hover {
  background: rgba(255, 255, 255, 0.08);
}

.dropdown-content a.reset-link {
  color: var(--red);
}

.dropdown-content a.reset-link:hover {
  background: rgba(239, 68, 68, 0.1);
}

/* DATA CONTAINER - DEFAULT MOBILE PORTRAIT LAYOUT */
#data-container {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* MOBILE PRODUCT CARD */
.product-card {
  padding: 16px;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: relative;
  overflow: hidden;
}

.product-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
}

.card-title-box {
  display: flex;
  flex-direction: column;
}

.card-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.card-subtitle {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 2px;
}

.card-price-box {
  text-align: right;
}

.card-price {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  color: var(--text-primary);
}

.card-price-discounted {
  color: var(--brand-accent-light);
  font-weight: 800;
}

.card-price-original {
  font-size: 11px;
  color: var(--text-muted);
  text-decoration: line-through;
  display: block;
}

/* Size Pill */
.card-size-pill {
  font-size: 11px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  padding: 2px 8px;
  border-radius: 6px;
  align-self: flex-start;
}

/* 2x2 Value Metrics Grid */
.card-metrics-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 4px;
}

.card-metric-tag {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.03);
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 11px;
  color: var(--text-secondary);
}

.card-metric-tag span {
  font-size: 9px;
  text-transform: uppercase;
  color: var(--text-muted);
  display: block;
  font-weight: 600;
  margin-bottom: 2px;
}

.card-metric-tag strong {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--text-primary);
}

.product-card .card-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 4px;
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
}

/* NO RESULTS VIEW */
.no-results-view {
  padding: 48px 16px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
}

.no-results-view i {
  font-size: 40px;
  color: var(--text-muted);
}

.no-results-view h3 {
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--text-primary);
}

/* APP FOOTER */
.app-footer {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px;
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
}

/* FLOATING STUDENT COMBO RESULT WIDGET */
.student-widget {
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%) translateY(150%);
  width: calc(100% - 32px);
  max-width: 550px;
  padding: 20px;
  z-index: 90;
  opacity: 0;
  transition: var(--transition-elastic);
  border-left: 4px solid var(--green);
}

.student-widget.active {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.student-widget-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

.student-widget-header h3 {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--green);
  display: flex;
  align-items: center;
  gap: 8px;
}

.student-combo-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 180px;
  overflow-y: auto;
  margin-bottom: 12px;
  padding-right: 4px;
}

.combo-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.02);
  padding: 6px 12px;
  border-radius: 8px;
  font-size: 13px;
}

.combo-item-qty {
  background: var(--green);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  margin-left: 6px;
}

.student-combo-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  border-top: 1px solid var(--border-color);
  padding-top: 12px;
}

.student-total-price {
  font-weight: 700;
  font-size: 15px;
}

/* MODALS */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(10px);
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal-card {
  width: 100%;
  max-width: 550px;
  padding: 24px;
  transform: scale(0.9);
  transition: var(--transition-elastic);
}

.modal-overlay.active .modal-card {
  transform: scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-header h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}

.close-modal-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 20px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.close-modal-btn:hover {
  color: var(--text-primary);
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.form-group label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-group label.required::after {
  content: ' *';
  color: var(--red);
}

.form-group input {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 0 12px;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 16px;
  height: 46px; /* Touch target */
  outline: none;
  transition: var(--transition-smooth);
}

.form-group input:focus {
  border-color: var(--brand-accent);
  background: rgba(255, 255, 255, 0.06);
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* TOASTS */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-width: calc(100% - 40px);
}

.toast {
  padding: 12px 18px;
  border-radius: 10px;
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: slideIn 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.toast-success { background: var(--green); }
.toast-error { background: var(--red); }
.toast-info { background: var(--blue); }
.toast-warning { background: var(--amber); }

@keyframes slideIn {
  from { transform: translateY(100%); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* ========================================== */
/* DESKTOP STYLES & OVERRIDES (>= 768px)      */
/* ========================================== */
@media (min-width: 768px) {
  #app {
    padding: 24px;
    gap: 24px;
  }

  .app-header {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 16px 24px;
  }

  .header-actions {
    width: auto;
  }

  .header-actions #add-product-btn {
    flex: none;
  }

  /* Metrics block side-by-side */
  .metrics-controls {
    flex-direction: row;
    gap: 24px;
    width: auto;
    padding: 0;
    border: none;
  }

  .control-item {
    flex-direction: row;
    align-items: center;
    gap: 10px;
  }

  .student-inputs input {
    width: 130px;
  }

  .student-inputs select {
    width: 170px;
  }

  /* Navigation search bar alignment */
  .navigation-bar {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
  }

  .category-nav {
    flex: 1;
  }

  .navigation-bar .search-box {
    width: 300px;
  }

  /* Forms grid expansion */
  .form-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .col-span-2 {
    grid-column: span 2;
  }

  /* Show table, Hide cards */
  #data-container {
    flex-direction: row;
  }

  .product-card {
    display: none;
  }

  .table-wrapper {
    width: 100%;
    overflow-x: auto;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    background: var(--bg-card);
  }

  table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    text-align: center;
    min-width: 1000px;
  }

  th, td {
    padding: 14px 10px;
    border-bottom: 1px solid var(--border-color);
  }

  th {
    background: rgba(255, 255, 255, 0.01);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 11px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    user-select: none;
  }

  th.sortable {
    cursor: pointer;
    transition: var(--transition-smooth);
  }

  th.sortable:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
  }

  .sort-icon {
    display: inline-block;
    width: 10px;
    font-size: 10px;
    color: var(--brand-accent-light);
  }

  tr:hover td {
    background: rgba(255, 255, 255, 0.015);
  }

  /* Table styling */
  .text-left { text-align: left; }
  .text-right { text-align: right; }

  .num-cell {
    color: var(--text-muted);
    font-weight: 600;
  }

  .name-cell {
    font-weight: 600;
    color: var(--text-primary);
  }

  .size-cell {
    font-family: var(--font-display);
    font-size: 12px;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    padding: 2px 6px;
    border-radius: 6px;
  }

  /* Highlight calculated columns */
  .calc-col {
    font-weight: 600;
    color: var(--brand-accent-light);
  }

  /* Table action buttons */
  .row-actions {
    display: flex;
    justify-content: center;
    gap: 6px;
  }

  .row-actions .action-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 14px;
    padding: 6px;
    border-radius: 6px;
    color: var(--text-secondary);
    transition: var(--transition-smooth);
  }

  .row-actions .action-btn-edit:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--blue);
  }

  .row-actions .action-btn-delete:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--red);
  }

  .app-footer {
    flex-direction: row;
    justify-content: space-between;
    padding: 16px 24px;
    text-align: left;
  }

  /* Floating widget adjustments */
  .student-widget {
    bottom: 24px;
    width: 500px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
  }
}

/* Brand Theme Overrides */
body.brand-dodo {
  --brand-accent: var(--dodo-orange);
  --brand-accent-light: var(--dodo-orange-light);
  --brand-accent-grad: var(--dodo-orange-grad);
  --brand-accent-glow: var(--dodo-orange-glow);
}

body.brand-vkusno {
  --brand-accent: var(--vkusno-green);
  --brand-accent-light: var(--vkusno-green-light);
  --brand-accent-grad: var(--vkusno-green-grad);
  --brand-accent-glow: var(--vkusno-green-glow);
}

body.brand-vkusno .bg-glow-1 {
  background: radial-gradient(circle, var(--vkusno-orange) 0%, transparent 70%);
}

/* Brand Selector UI styling */
.brand-selector-container {
  display: flex;
  justify-content: center;
  width: 100%;
  margin-bottom: 4px;
}

.brand-selector {
  display: flex;
  gap: 8px;
  padding: 6px;
  border-radius: 14px;
  width: 100%;
  max-width: 500px;
}

.brand-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-main);
  font-size: 14px;
  font-weight: 600;
  height: 40px;
  border-radius: 10px;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.brand-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.04);
}

.brand-btn.active {
  background: var(--brand-accent-grad);
  color: #fff;
  box-shadow: 0 4px 12px var(--brand-accent-glow);
}