:root {
  /* Brand colors */
  --ys-red: #d61f26;
  --ys-red-dark: #b0191f;
  --ys-red-light: #e63946;
  --ys-black: #111214;
  --ys-dark-gray: #1a1b1e;
  --ys-medium-gray: #2a2b2e;
  --ys-light-gray: #f5f6f8;
  --ys-white: #ffffff;
  
  /* UI colors */
  --ys-border: rgba(255, 255, 255, 0.10);
  --ys-border-light: rgba(255, 255, 255, 0.15);
  --ys-border-focus: rgba(214, 31, 38, 0.5);
  
  /* Shadows */
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-large: 0 8px 24px rgba(0, 0, 0, 0.3);
  
  /* Typography */
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 13px;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 18px;
  --font-size-2xl: 26px;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 20px;
  
  /* Border radius */
  --radius-sm: 14px;
  --radius-md: 16px;
  --radius-lg: 18px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* Reset and base styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  font-size: var(--font-size-base);
  line-height: 1.5;
  background: var(--ys-black);
  color: var(--ys-white);
  height: 100vh;
  overflow: hidden;
  touch-action: manipulation; /* Disable double-tap zoom on mobile */
}

/* Utility classes */
.hidden {
  display: none !important;
  visibility: hidden !important;
}

/* Typography */
a {
  color: inherit;
  text-decoration: none;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
}

/* Kiosk shell */
.kiosk-shell {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
}

/* Card component */
.card {
  background: var(--ys-dark-gray);
  border: 1px solid var(--ys-border);
  box-shadow: var(--shadow);
  border-radius: var(--radius-lg);
}

/* Button styles */
.btn {
  --btn-padding: var(--spacing-lg) var(--spacing-xl);
  
  border: 0;
  background: var(--ys-red);
  color: var(--ys-white);
  padding: var(--btn-padding);
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: var(--font-size-xl);
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: all var(--transition-fast);
  min-height: 56px; /* Minimum touch target size */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.btn:hover:not(:disabled) {
  background: var(--ys-red-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-large);
}

.btn:active:not(:disabled) {
  background: var(--ys-red-dark);
  transform: translateY(0);
}

.btn:focus-visible {
  outline: 2px solid var(--ys-border-focus);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.btn.secondary {
  background: transparent;
  border: 1px solid var(--ys-border);
}

.btn.secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--ys-border-light);
}

.btn.ghost {
  background: transparent;
  border: 1px dashed var(--ys-border);
}

.btn.ghost:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--ys-border-light);
}

/* Logo block */
.logo-block {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
}

.logo {
  width: 120px;
  height: 120px;
  border-radius: 999px;
  object-fit: contain;
  background: #000;
  padding: var(--spacing-sm);
  border: 1px solid var(--ys-border);
}

.brand {
  font-size: var(--font-size-2xl);
  font-weight: 900;
  letter-spacing: 0.5px;
}

.since {
  font-size: var(--font-size-sm);
  opacity: 0.85;
}

/* Welcome screen */
.welcome-box {
  width: min(520px, 92vw);
  padding: var(--spacing-xl);
  text-align: center;
}

.welcome-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.note {
  margin-top: var(--spacing-sm);
  font-size: var(--font-size-sm);
  opacity: 0.85;
  line-height: 1.4;
}

.badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 999px;
  border: 1px solid var(--ys-border);
  font-size: var(--font-size-xs);
  opacity: 0.9;
  background: rgba(255, 255, 255, 0.05);
}

/* ===== MENU LAYOUT ===== */
.menu-layout {
  height: 100vh;
  display: grid;
  grid-template-columns: 240px 1fr 320px;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
}

@media (max-width: 1024px) {
  .menu-layout {
    grid-template-columns: 200px 1fr 280px;
  }
}

@media (max-height: 800px) {
  .menu-layout {
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
  }
}

/* Sidebar, cart panel, main panel */
.sidebar,
.cart-panel,
.main-panel {
  border-radius: var(--radius-lg);
  border: 1px solid var(--ys-border);
  background: var(--ys-dark-gray);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

/* Panel headers */
.sidebar-head,
.cart-head,
.main-head {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--ys-border);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.sidebar-head img {
  width: 44px;
  height: 44px;
  border-radius: 999px;
  background: #000;
  padding: 6px;
  border: 1px solid var(--ys-border);
}

.sidebar-title {
  font-weight: 900;
  font-size: var(--font-size-lg);
}

.sidebar-sub {
  font-size: var(--font-size-xs);
  opacity: 0.85;
}

/* Category list */
.sidebar-list {
  padding: var(--spacing-sm);
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  flex: 1;
}

/* Custom scrollbar */
.sidebar-list::-webkit-scrollbar,
.item-grid::-webkit-scrollbar,
.cart-body::-webkit-scrollbar {
  width: 6px;
}

.sidebar-list::-webkit-scrollbar-track,
.item-grid::-webkit-scrollbar-track,
.cart-body::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 3px;
}

.sidebar-list::-webkit-scrollbar-thumb,
.item-grid::-webkit-scrollbar-thumb,
.cart-body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}

.sidebar-list::-webkit-scrollbar-thumb:hover,
.item-grid::-webkit-scrollbar-thumb:hover,
.cart-body::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

.cat-btn {
  --cat-btn-padding: var(--spacing-md);
  
  width: 100%;
  text-align: left;
  padding: var(--cat-btn-padding);
  border-radius: var(--radius-sm);
  border: 1px solid var(--ys-border);
  background: transparent;
  color: var(--ys-white);
  cursor: pointer;
  font-weight: 700;
  transition: all var(--transition-fast);
  min-height: 48px; /* Minimum touch target */
}

.cat-btn:hover:not(.active) {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--ys-border-light);
}

.cat-btn.active {
  background: rgba(214, 31, 38, 0.15);
  border-color: rgba(214, 31, 38, 0.5);
}

.cat-btn:focus-visible {
  outline: 2px solid var(--ys-border-focus);
  outline-offset: 2px;
}

/* Main panel */
.main-panel {
  overflow: hidden;
}

.item-grid {
  padding: var(--spacing-md);
  overflow: auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--spacing-md);
  flex: 1;
}

/* Item cards */
.item-card {
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  border: 1px solid var(--ys-border);
  background: #141518;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.item-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-large);
}

.item-name {
  font-weight: 900;
  font-size: 15px;
  line-height: 1.3;
}

.item-desc {
  font-size: var(--font-size-xs);
  opacity: 0.85;
  line-height: 1.4;
  min-height: 36px;
  flex: 1;
}

.item-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.price {
  font-weight: 900;
  font-size: var(--font-size-lg);
}

.add-btn {
  --add-btn-padding: var(--spacing-sm) var(--spacing-md);
  
  padding: var(--add-btn-padding);
  border-radius: var(--radius-sm);
  border: 0;
  background: var(--ys-red);
  color: #fff;
  font-weight: 900;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 40px;
  min-width: 80px;
}

.add-btn:hover {
  background: var(--ys-red-light);
  transform: scale(1.05);
}

.add-btn:active {
  background: var(--ys-red-dark);
  transform: scale(0.95);
}

.add-btn:focus-visible {
  outline: 2px solid var(--ys-border-focus);
  outline-offset: 2px;
}

/* Cart panel */
.cart-body {
  padding: var(--spacing-md);
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  flex: 1;
}

.cart-item {
  border: 1px solid var(--ys-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm);
  background: #141518;
  transition: border-color var(--transition-fast);
}

.cart-item:hover {
  border-color: var(--ys-border-light);
}

.cart-row {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-sm);
  align-items: flex-start;
}

.cart-name {
  font-weight: 900;
  font-size: var(--font-size-sm);
  line-height: 1.3;
}

.cart-meta {
  font-size: var(--font-size-xs);
  opacity: 0.85;
  margin-top: var(--spacing-xs);
  line-height: 1.3;
}

.qty-row {
  margin-top: var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
}

.qty-btn {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--ys-border);
  background: transparent;
  color: #fff;
  font-weight: 900;
  cursor: pointer;
  font-size: var(--font-size-lg);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.qty-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--ys-border-light);
}

.qty-btn:active {
  background: rgba(255, 255, 255, 0.1);
}

.qty-btn:focus-visible {
  outline: 2px solid var(--ys-border-focus);
  outline-offset: 2px;
}

.qty {
  font-weight: 900;
  font-size: var(--font-size-lg);
  min-width: 24px;
  text-align: center;
}

.total-box {
  padding: var(--spacing-md) var(--spacing-md);
  border-top: 1px solid var(--ys-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.total-label {
  opacity: 0.85;
  font-size: var(--font-size-lg);
}

.total-val {
  font-weight: 900;
  font-size: var(--font-size-xl);
}

.cart-actions {
  padding: var(--spacing-md) var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  border-top: 1px solid var(--ys-border);
  flex-shrink: 0;
}

.textarea {
  width: 100%;
  min-height: 70px;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  border: 1px solid var(--ys-border);
  background: #0f1012;
  color: #fff;
  resize: none;
  font-family: inherit;
  font-size: var(--font-size-base);
  line-height: 1.5;
  transition: border-color var(--transition-fast);
}

.textarea:focus {
  outline: none;
  border-color: var(--ys-border-focus);
}

.textarea::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

/* ===== MODALS / PIN PAD ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  z-index: 1000;
  backdrop-filter: blur(4px);
}

.modal {
  width: min(520px, 92vw);
  padding: var(--spacing-lg);
  animation: modal-appear 200ms ease-out;
}

@keyframes modal-appear {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal h2 {
  margin: var(--spacing-xs) 0 var(--spacing-sm) 0;
  font-size: var(--font-size-xl);
  line-height: 1.3;
}

.modal .row {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.modal .row .btn {
  flex: 1;
  min-width: 160px;
}

.field {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-md);
  border-radius: var(--radius-sm);
  border: 1px solid var(--ys-border);
  background: #0f1012;
  color: #fff;
  font-size: 15px;
  transition: border-color var(--transition-fast);
}

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

.field::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

/* PIN pad */
.pin-pad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-sm);
  margin-top: var(--spacing-sm);
}

.pin-key {
  padding: var(--spacing-lg) 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--ys-border);
  background: #0f1012;
  color: #fff;
  font-weight: 900;
  font-size: var(--font-size-xl);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 56px; /* Minimum touch target */
}

.pin-key:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--ys-border-light);
}

.pin-key:active {
  background: rgba(255, 255, 255, 0.1);
  transform: scale(0.95);
}

.pin-key:focus-visible {
  outline: 2px solid var(--ys-border-focus);
  outline-offset: 2px;
}

.pin-screen {
  width: 100%;
  text-align: center;
  padding: var(--spacing-md);
  border-radius: var(--radius-sm);
  border: 1px solid var(--ys-border);
  background: #0f1012;
  font-weight: 900;
  letter-spacing: 6px;
  font-size: var(--font-size-xl);
  font-variant-numeric: tabular-nums;
}

.small {
  font-size: var(--font-size-xs);
  opacity: 0.85;
  line-height: 1.4;
}

/* Print styles */
@media print {
  .menu-layout {
    height: auto;
    overflow: visible;
  }
  
  .sidebar,
  .cart-panel .cart-head,
  .cart-panel .cart-actions {
    display: none;
  }
  
  .cart-panel {
    border: none;
    box-shadow: none;
    background: transparent;
  }
  
  .cart-body,
  .total-box {
    border: none;
    padding: 0;
  }
  
  body {
    background: white;
    color: black;
  }
}

/* Error state */
.error {
  border-color: var(--ys-red) !important;
}

.error:focus {
  border-color: var(--ys-red-light) !important;
}

/* Success state */
.success {
  border-color: #2ecc71 !important;
}

/* Loading state */
.loading {
  opacity: 0.7;
  pointer-events: none;
}