/* ==========================================================================
   UTILITY & COMPONENT STYLES - SMART RESTAURANT
   Tiêu chí 1 (UI/UX) & Tiêu chí 2 (Chức năng & Tương tác)
   Các thành phần giao diện nền: Button, Input, Modal, Toast, Skeleton, Badge, Drawer
   ========================================================================== */

/* --- FLEX & GRID HELPERS --- */
.flex { display: flex; }
.flex-col { display: flex; flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.flex-1 { flex: 1; }
.flex-wrap { flex-wrap: wrap; }

/* Grid Responsive Dishes */
.dish-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

@media (max-width: 640px) {
  .dish-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

/* --- BUTTONS --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.65rem 1.25rem;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  user-select: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.25);
}
.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(217, 119, 6, 0.35);
}
.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--color-surface-alt);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-surface-hover);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-outline {
  border: 1.5px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}
.btn-outline:hover:not(:disabled) {
  background-color: var(--color-primary-light);
}

.btn-danger {
  background-color: var(--color-danger);
  color: #ffffff;
}
.btn-danger:hover:not(:disabled) {
  background-color: #dc2626;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1.05rem;
  border-radius: var(--radius-lg);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
}
.btn-icon:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-primary);
}

/* --- FORMS & INPUTS --- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
  text-align: left;
}

.form-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-main);
}

.input, .select, .textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--color-text-main);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.input:focus, .select:focus, .textarea:focus {
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

.input-error {
  border-color: var(--color-danger) !important;
}

.error-text {
  font-size: 0.825rem;
  color: var(--color-danger);
  margin-top: var(--space-1);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* --- BADGES --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius-full);
}

.badge-amber {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

.badge-success {
  background-color: var(--color-success-bg);
  color: var(--color-success);
}

.badge-danger {
  background-color: var(--color-danger-bg);
  color: var(--color-danger);
}

.badge-warning {
  background-color: var(--color-warning-bg);
  color: var(--color-warning);
}

/* --- CARDS --- */
.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

@media (hover: hover) and (pointer: fine) {
  .card-hover:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary-light);
  }
  .card-hover:hover img {
    transform: scale(1.04);
  }
}

/* --- SKELETON LOADERS (Rubric Tiêu chí 1: UI/UX Loading state) --- */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-surface-alt) 25%,
    var(--color-surface-hover) 50%,
    var(--color-surface-alt) 75%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.skeleton-card {
  height: 380px;
  border-radius: var(--radius-lg);
}

/* --- MODAL SYSTEM --- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  -webkit-backdrop-filter: blur(4px);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.modal-box {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 580px;
  max-height: 90vh;
  max-height: 90dvh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.modal-backdrop.active .modal-box {
  transform: scale(1);
}

.modal-header {
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-body {
  padding: var(--space-6);
  overflow-y: auto;
}

.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  background-color: var(--color-surface-alt);
}

/* --- TOAST NOTIFICATIONS --- */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: 2000;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background-color: var(--color-surface);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 280px;
  max-width: 420px;
  font-size: 0.95rem;
  animation: toast-slide-in 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  border-left: 5px solid var(--color-primary);
}

.toast-success { border-left-color: var(--color-success); }
.toast-error { border-left-color: var(--color-danger); }
.toast-warning { border-left-color: var(--color-warning); }

@keyframes toast-slide-in {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

/* --- CART DRAWER (NGĂN KÉO GIỎ HÀNG) --- */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.5);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.drawer-backdrop.active {
  opacity: 1;
  visibility: visible;
}

.cart-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 440px;
  background-color: var(--color-surface);
  box-shadow: -5px 0 25px rgba(0, 0, 0, 0.2);
  z-index: 1001;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  display: flex;
  flex-direction: column;
}

.drawer-backdrop.active .cart-drawer {
  transform: translateX(0);
}

.drawer-header {
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.drawer-body {
  padding: var(--space-4) var(--space-6);
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.cart-item-card {
  height: auto !important;
  min-height: fit-content !important;
  overflow: visible !important;
}

.drawer-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface-alt);
}

/* --- EMPTY STATE (Rubric Tiêu chí 1: Trạng thái Empty) --- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-12) var(--space-4);
  gap: var(--space-3);
}

.empty-icon {
  font-size: 3.5rem;
  color: var(--color-text-light);
  line-height: 1;
}

.empty-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-main);
}

.empty-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  max-width: 360px;
}

/* --- RESPONSIVE TABLE FOR ADMIN --- */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

/* --- ADMIN TABS NAVIGATION (Nhóm 1 - T1.2, T1.3) --- */
.admin-tabs-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background-color: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-border);
  overflow: visible;
}

.admin-tab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.875rem;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  min-height: 40px;
  line-height: 1.2;
  cursor: pointer;
  border: 1px solid var(--color-border);
  transition: background-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.admin-tab-btn--active {
  background-color: var(--color-primary) !important;
  color: #fff !important;
  border-color: var(--color-primary) !important;
  font-weight: 700 !important;
  box-shadow: 0 2px 8px rgba(181, 71, 42, 0.35) !important;
}

.admin-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.admin-table th, .admin-table td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.925rem;
}

.admin-table th {
  background-color: var(--color-surface-alt);
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.admin-table tbody tr:hover {
  background-color: var(--color-surface-hover);
}

/* --- MOBILE BOTTOM NAVIGATION BAR (Tương thích iOS, Android, Mac) --- */
.mobile-bottom-bar {
  display: none;
}

@media (max-width: 768px) {
  .desktop-nav {
    display: none !important;
  }

  .mobile-bottom-bar {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 64px;
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
    z-index: 990;
    align-items: center;
    justify-content: space-around;
    padding: 0 4px;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    transition: background-color var(--transition-normal);
  }

  .mobile-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-text-muted);
    gap: 2px;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast);
    flex: 1;
    text-align: center;
    cursor: pointer;
    background: none;
    border: none;
  }

  .mobile-nav-item span.nav-icon {
    font-size: 1.25rem;
    line-height: 1;
  }

  .mobile-nav-item:hover, .mobile-nav-item:active {
    color: var(--color-primary);
  }
}

/* ==================== SIDEBAR & OVERLAY (Task 4) ==================== */
#auth-header-container {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

#header-user-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  letter-spacing: 0.04em;
  font-weight: 700;
  text-transform: uppercase;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}
#header-user-badge:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}

.sidebar-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  z-index: 1040;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}
.sidebar-overlay.active {
  opacity: 1;
  visibility: visible;
}

.app-sidebar {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(340px, 86vw);
  background-color: var(--color-surface);
  border-left: 1px solid var(--color-border);
  box-shadow: -8px 0 25px rgba(0, 0, 0, 0.15);
  z-index: 1045;
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}
.app-sidebar.active {
  transform: translateX(0);
}

.sidebar-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--color-surface-alt);
}
.sidebar-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-primary);
  line-height: 1.1;
}
.sidebar-sub {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-user-card {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  background: linear-gradient(135deg, rgba(181, 71, 42, 0.04) 0%, rgba(63, 107, 58, 0.04) 100%);
}

.sidebar-nav {
  padding: var(--space-3) var(--space-4);
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.sidebar-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-main);
  text-decoration: none;
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}
.sidebar-item:hover, .sidebar-item:focus-visible {
  background-color: var(--color-surface-alt);
  color: var(--color-primary);
}
.sidebar-item--active {
  background-color: rgba(181, 71, 42, 0.08);
  color: var(--color-primary);
  font-weight: 700;
}
.sidebar-section-title {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 12px 14px 4px;
}

.sidebar-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface-alt);
}

/* --- KITCHEN FADE-OUT ANIMATION (T2.5) --- */
@keyframes kitchenItemFadeOut {
  0% {
    opacity: 1;
    transform: scale(1);
  }
  60% {
    opacity: 0.35;
    transform: scale(0.98);
  }
  100% {
    opacity: 0;
    transform: scale(0.95);
    max-height: 0;
    margin-bottom: 0;
    padding-top: 0;
    padding-bottom: 0;
    overflow: hidden;
  }
}

.kitchen-item-fading {
  animation: kitchenItemFadeOut 5s cubic-bezier(0.4, 0, 0.2, 1) forwards !important;
  pointer-events: none !important;
}

/* ==========================================================================
   CSS FALLBACKS & CROSS-BROWSER COMPATIBILITY (T33)
   - Fallback cho trình duyệt không hỗ trợ backdrop-filter
   - Fallback cho trình duyệt không hỗ trợ 100dvh
   ========================================================================== */

@supports not ((-webkit-backdrop-filter: blur(4px)) or (backdrop-filter: blur(4px))) {
  .modal-backdrop,
  .family-meal-modal,
  .sidebar-overlay {
    background-color: rgba(15, 23, 42, 0.88);
  }
  .drawer-backdrop {
    background-color: rgba(15, 23, 42, 0.8);
  }
}

@supports not (height: 100dvh) {
  .modal-box,
  .cart-drawer,
  .family-meal-modal__dialog {
    max-height: 90vh;
  }
}

/* ==========================================================================
   UI FEEDBACK & MICRO-INTERACTIONS (NHÓM 3 - T3.1 & T3.2)
   Module dung chung: Haptic feedback, button tap active, shake, bounce
   Tuan thu:
   - Chi chuyen doi thuoc tinh cu the (khong dung all)
   - Thu phong toi thieu 0.96 (khong dung 0)
   - Tuong thich media prefers-reduced-motion
   ========================================================================== */

/* 1. Hiệu ứng nhấn nút fallback / tap active (T3.2) */
.ui-tap-active,
.btn:active,
.btn-icon:active,
button:active,
[role="button"]:active {
  transform: scale(0.96) !important;
}

/* 2. Hiệu ứng rung lắc (Shake) cho Form / Error (T3.3) */
@keyframes uiShakeAnim {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

.ui-shake {
  animation: uiShakeAnim 0.35s ease-in-out !important;
}

/* 3. Hiệu ứng nảy nhẹ (Bounce) cho Modal / Cart (T3.3, T3.4) */
@keyframes uiBounceAnim {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.04); }
}

.ui-bounce {
  animation: uiBounceAnim 0.35s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
}

/* 4. Viền đỏ rung khi input lỗi (T3.3) */
.ui-input-error,
.input-error {
  border-color: var(--color-danger, #ef4444) !important;
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2) !important;
}

/* 5. Hỗ trợ prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .ui-tap-active,
  .btn:active,
  .btn-icon:active,
  button:active,
  [role="button"]:active,
  .ui-shake,
  .ui-bounce,
  .card-hover:hover,
  .card-hover:hover img {
    animation: none !important;
    transform: none !important;
  }
  .toast {
    animation: none !important;
  }
  .modal-box {
    transform: none !important;
    transition: none !important;
  }
  .ui-input-error {
    animation: none !important;
  }
}