/**
 * ENTERPRISE UI COMPONENTS STYLESHEET
 * Nền tảng Hạ tầng số tích hợp thông tin cung - cầu công nghệ
 * Thiết kế chuẩn Enterprise SaaS (Theme B: Modern Technology)
 * Tuân thủ quy tắc: 100% Bootstrap Icons Font, Tuyệt đối không dùng SVG
 */

/* ==========================================================================
   1. LAYOUT STYLES (HEADER, SIDEBAR, BREADCRUMB, FOOTER)
   ========================================================================== */

/* Main Header */
.tech-header {
  height: var(--header-height);
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-default);
  position: sticky;
  top: 0;
  z-index: 1020;
  display: flex;
  align-items: center;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.tech-header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  opacity: 0.9;
}

.tech-brand-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  text-decoration: none;
  color: var(--text-main);
  font-weight: var(--font-weight-extrabold);
  font-size: var(--font-size-lg);
  letter-spacing: -0.02em;
}

.tech-brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: #FFFFFF;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  box-shadow: 0 2px 6px rgba(13, 148, 136, 0.25);
}

/* Header Desktop Navigation (Responsive & Dropdown Menu) */
.tech-header-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.tech-header-nav .nav-link-btn {
  white-space: nowrap !important;
  font-size: 0.875rem; /* 14px chuẩn SaaS */
  font-weight: 500;
  color: var(--text-secondary, #334155);
  padding: 0.42rem 0.65rem;
  border-radius: var(--radius-md, 8px);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  background-color: transparent;
  border: 1px solid transparent;
  transition: all var(--transition-fast, 0.15s ease);
  line-height: 1.4;
}

.tech-header-nav .nav-link-btn:hover,
.tech-header-nav .nav-link-btn:focus,
.tech-header-nav .nav-link-btn.show,
.tech-header-nav .nav-link-btn.active {
  color: var(--color-primary, #0D9488);
  background-color: var(--teal-50, #F0FDFA);
  border-color: #CCFBF1;
}

.tech-header-nav .dropdown-toggle::after {
  margin-left: 0.35rem;
  vertical-align: 0.125em;
  border-top-color: currentColor;
}

.tech-header-nav .dropdown-menu {
  border: 1px solid var(--border-default, #E2E8F0);
  border-radius: 12px;
  box-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.1), 0 8px 10px -6px rgba(15, 23, 42, 0.05);
  padding: 0.5rem;
  min-width: 250px;
}

.tech-header-nav .dropdown-item {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  color: #1E293B;
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  transition: all 0.15s ease;
}

.tech-header-nav .dropdown-item:hover {
  background-color: #F0FDFA;
  color: #0D9488;
}

.tech-header-nav .dropdown-item i {
  color: #0D9488;
  font-size: 1.15rem;
  margin-top: 1px;
}

/* Hover to show dropdown menu on desktop */
@media (min-width: 1200px) {
  .tech-header-nav .dropdown {
    position: relative;
  }

  /* Tạo vùng đệm nối giữa link cha và menu dropdown để không bị rớt chuột khi di chuyển */
  .tech-header-nav .dropdown::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    right: 0;
    height: 12px;
    background: transparent;
    z-index: 1025;
  }

  .tech-header-nav .dropdown:hover > .dropdown-menu {
    display: block !important;
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto !important;
    transform: translateY(0) !important;
  }

  .tech-header-nav .dropdown > .dropdown-menu {
    display: block !important;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity 0.18s cubic-bezier(0.16, 1, 0.3, 1), transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.18s ease;
    margin-top: 4px;
    z-index: 1030;
  }

  .tech-header-nav .dropdown:hover > .nav-link-btn {
    color: var(--color-primary, #0D9488);
    background-color: var(--teal-50, #F0FDFA);
    border-color: #CCFBF1;
  }
}

@media (min-width: 1600px) {
  .tech-header-nav {
    gap: 8px;
  }
  .tech-header-nav .nav-link-btn {
    font-size: 0.9375rem; /* 15px trên màn hình lớn */
    padding: 0.48rem 0.85rem;
  }
}

/* Mobile Offcanvas Drawer Full Height & Layout */
.tech-mobile-offcanvas {
  width: 320px !important;
  max-width: 86vw !important;
  height: 100vh !important;
  max-height: 100vh !important;
  z-index: 1070 !important;
  box-shadow: 4px 0 28px rgba(15, 23, 42, 0.2) !important;
  background-color: #FFFFFF !important;
}

.tech-mobile-offcanvas .offcanvas-body {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius-md, 8px);
  color: var(--text-main, #0F172A);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: all 0.15s ease;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  background-color: var(--teal-50, #F0FDFA);
  color: var(--color-primary, #0D9488);
}

.mobile-nav-sublink {
  display: flex;
  align-items: center;
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm, 6px);
  color: var(--text-secondary, #475569);
  text-decoration: none;
  font-size: 0.825rem;
  font-weight: 500;
  transition: all 0.15s ease;
}

.mobile-nav-sublink:hover,
.mobile-nav-sublink.active {
  background-color: var(--teal-50, #F0FDFA);
  color: var(--color-primary, #0D9488);
}

/* Sidebar Navigation */
.tech-sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  transition: width var(--transition-normal);
  z-index: 1010;
}

.tech-sidebar-brand {
  height: var(--header-height);
  padding: 0 var(--spacing-5);
  display: flex;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.tech-nav-group-title {
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-sidebar-muted);
  font-weight: var(--font-weight-bold);
  padding: var(--spacing-4) var(--spacing-5) var(--spacing-2);
}

.tech-sidebar-nav {
  list-style: none;
  padding: var(--spacing-2) var(--spacing-3);
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.tech-nav-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  padding: 0.625rem 0.875rem;
  color: var(--text-sidebar);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.tech-nav-link i {
  font-size: 1.15rem;
  color: var(--text-sidebar-muted);
  transition: color var(--transition-fast);
}

.tech-nav-link:hover {
  background-color: rgba(255, 255, 255, 0.06);
  color: #FFFFFF;
}

.tech-nav-link:hover i {
  color: var(--color-accent);
}

.tech-nav-link.active {
  background-color: var(--bg-sidebar-active);
  color: #FFFFFF;
  font-weight: var(--font-weight-semibold);
}

.tech-nav-link.active i {
  color: var(--color-accent);
}

.tech-nav-link.active::before {
  content: '';
  position: absolute;
  left: -0.75rem;
  top: 6px;
  bottom: 6px;
  width: 4px;
  background-color: var(--color-accent);
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
}

/* Breadcrumb */
.tech-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.tech-breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.tech-breadcrumb a:hover {
  color: var(--color-primary);
}

.tech-breadcrumb .separator {
  color: var(--slate-300);
}

/* Footer */
.tech-footer {
  background-color: var(--bg-surface);
  border-top: 1px solid var(--border-default);
  padding: var(--spacing-6) 0;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

/* ==========================================================================
   2. BUTTONS & ACTIONS
   ========================================================================== */
.btn-tech {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-md);
  padding: 0.5625rem 1.125rem;
  line-height: 1.4;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.btn-tech i {
  font-size: 1.05em;
}

/* Primary Button */
.btn-tech-primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, #0E7490 100%);
  color: #FFFFFF;
  box-shadow: 0 2px 4px rgba(13, 148, 136, 0.2);
}

.btn-tech-primary:hover {
  background: linear-gradient(135deg, var(--color-primary-hover) 0%, #0A5A70 100%);
  color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(13, 148, 136, 0.3);
}

/* Secondary Button */
.btn-tech-secondary {
  background-color: var(--bg-surface);
  border-color: var(--border-default);
  color: var(--text-main);
}

.btn-tech-secondary:hover {
  background-color: var(--slate-100);
  border-color: var(--border-strong);
  color: var(--text-main);
}

/* Outline Tech Accent */
.btn-tech-outline {
  background-color: transparent;
  border-color: var(--color-primary-border);
  color: var(--color-primary);
}

.btn-tech-outline:hover {
  background-color: var(--color-primary-subtle);
  border-color: var(--color-primary);
  color: var(--color-primary-hover);
}

/* Ghost Button */
.btn-tech-ghost {
  background-color: transparent;
  color: var(--text-secondary);
}

.btn-tech-ghost:hover {
  background-color: var(--slate-100);
  color: var(--text-main);
}

/* Danger Button */
.btn-tech-danger {
  background-color: var(--danger-600);
  color: #FFFFFF;
}

.btn-tech-danger:hover {
  background-color: var(--danger-700);
  color: #FFFFFF;
}

/* Sizes */
.btn-tech-sm {
  padding: 0.375rem 0.75rem;
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
}

.btn-tech-lg {
  padding: 0.75rem 1.5rem;
  font-size: var(--font-size-base);
  border-radius: var(--radius-lg);
}

/* ==========================================================================
   3. CARDS & KPI STATS WIDGETS
   ========================================================================== */
.tech-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-5);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
  position: relative;
}

.tech-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

/* KPI Card */
.kpi-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--spacing-5);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.kpi-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-border);
}

.kpi-value {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--text-main);
  line-height: 1.1;
  margin: var(--spacing-2) 0 var(--spacing-1);
}

.kpi-title {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  font-weight: var(--font-weight-semibold);
}

.kpi-icon-box {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
}

.kpi-trend-up {
  color: var(--success-600);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  display: inline-flex;
  align-items: center;
  gap: 2px;
}

/* ==========================================================================
   4. STATUS BADGES & TAGS
   ========================================================================== */
.badge-tech {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-pill);
  line-height: 1;
}

.badge-trl {
  background-color: var(--teal-50);
  color: var(--teal-800);
  border: 1px solid var(--teal-300);
  font-family: var(--font-family-mono);
  font-weight: var(--font-weight-bold);
}

.badge-level {
  background-color: var(--cyan-50);
  color: var(--cyan-700);
  border: 1px solid var(--cyan-200);
}

.badge-status-published {
  background-color: var(--success-50);
  color: var(--success-700);
  border: 1px solid #A7F3D0;
}

.badge-status-pending {
  background-color: var(--warning-50);
  color: var(--warning-700);
  border: 1px solid #FDE68A;
}

.badge-status-closed {
  background-color: var(--slate-100);
  color: var(--slate-600);
  border: 1px solid var(--slate-200);
}

.badge-status-danger {
  background-color: var(--danger-50);
  color: var(--danger-700);
  border: 1px solid #FECACA;
}

.badge-verified {
  background-color: var(--teal-50);
  color: var(--color-primary);
  border: 1px solid var(--teal-200);
}

/* ==========================================================================
   5. DATA TABLE (ENTERPRISE DENSE TABLE)
   ========================================================================== */
.table-responsive-wrapper {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  box-shadow: var(--shadow-sm);
}

.tech-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

.tech-table thead th {
  background-color: var(--bg-surface-subtle);
  color: var(--text-secondary);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-default);
  white-space: nowrap;
}

.tech-table tbody td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-main);
  vertical-align: middle;
}

.tech-table tbody tr:hover td {
  background-color: var(--teal-50);
}

/* ==========================================================================
   6. SEARCH & FILTER CONTROLS
   ========================================================================== */
.tech-search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.tech-search-box i {
  position: absolute;
  left: 0.875rem;
  color: var(--text-muted);
  font-size: 1rem;
  pointer-events: none;
}

.tech-search-input {
  width: 100%;
  padding: 0.5625rem 2.25rem 0.5625rem 2.5rem;
  font-size: var(--font-size-sm);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
  color: var(--text-main);
  transition: all var(--transition-fast);
}

.tech-search-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.2);
}

.tech-search-shortcut {
  position: absolute;
  right: 0.625rem;
  font-size: 0.6875rem;
  font-family: var(--font-family-mono);
  background-color: var(--slate-100);
  color: var(--text-muted);
  padding: 2px 5px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border-default);
}

/* Filter Pills */
.filter-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: 0.375rem 0.75rem;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-pill);
  background-color: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-pill:hover,
.filter-pill.active {
  border-color: var(--color-primary);
  background-color: var(--color-primary-subtle);
  color: var(--color-primary-hover);
}

/* ==========================================================================
   7. FORM CONTROLS & DROPZONE
   ========================================================================== */
.form-tech-group {
  margin-bottom: var(--spacing-4);
}

.form-tech-label {
  display: block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--text-main);
  margin-bottom: var(--spacing-1);
}

.form-tech-label .required {
  color: var(--danger-600);
  margin-left: 2px;
}

.form-tech-control {
  width: 100%;
  padding: 0.5625rem 0.875rem;
  font-size: var(--font-size-sm);
  color: var(--text-main);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-tech-control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.2);
}

/* File Dropzone */
.tech-dropzone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  padding: var(--spacing-8) var(--spacing-4);
  text-align: center;
  background-color: var(--bg-surface-subtle);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tech-dropzone:hover {
  border-color: var(--color-primary);
  background-color: var(--teal-50);
}

.tech-dropzone i {
  font-size: 2.25rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-2);
}

/* ==========================================================================
   8. MODAL DIALOGS
   ========================================================================== */
.tech-modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(9, 13, 22, 0.65);
  backdrop-filter: blur(4px);
  z-index: 1050;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.tech-modal-backdrop.show {
  display: flex;
  opacity: 1;
}

.tech-modal-content {
  background-color: var(--bg-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 540px;
  max-height: 90vh;
  overflow-y: auto;
  border: 1px solid var(--border-default);
  transform: translateY(20px);
  transition: transform var(--transition-normal);
}

.tech-modal-backdrop.show .tech-modal-content {
  transform: translateY(0);
}

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

.tech-modal-body {
  padding: var(--spacing-6);
}

.tech-modal-footer {
  padding: var(--spacing-4) var(--spacing-6);
  border-top: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--spacing-3);
  background-color: var(--bg-surface-subtle);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* ==========================================================================
   9. STEPPER & TIMELINE
   ========================================================================== */
.tech-stepper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  margin: var(--spacing-6) 0;
}

.tech-stepper::before {
  content: '';
  position: absolute;
  top: 18px;
  left: 30px;
  right: 30px;
  height: 2px;
  background-color: var(--border-default);
  z-index: 1;
}

.step-node {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--spacing-2);
}

.step-circle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  background-color: var(--bg-surface);
  border: 2px solid var(--border-strong);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  transition: all var(--transition-fast);
}

.step-node.active .step-circle {
  border-color: var(--color-primary);
  background-color: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 0 0 4px rgba(13, 148, 136, 0.2);
}

.step-node.completed .step-circle {
  border-color: var(--success-600);
  background-color: var(--success-600);
  color: #FFFFFF;
}

.step-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--text-secondary);
}

/* Timeline */
.tech-timeline {
  position: relative;
  padding-left: 2rem;
  border-left: 2px solid var(--border-default);
  margin-left: 0.75rem;
}

.timeline-item {
  position: relative;
  margin-bottom: var(--spacing-6);
}

.timeline-point {
  position: absolute;
  left: -2.45rem;
  top: 0.15rem;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  border: 3px solid var(--bg-surface);
}

/* ==========================================================================
   10. PROGRESS BAR & METRICS
   ========================================================================== */
.tech-progress {
  height: 8px;
  background-color: var(--slate-100);
  border-radius: var(--radius-pill);
  overflow: hidden;
  display: flex;
}

.tech-progress-bar {
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  height: 100%;
  border-radius: var(--radius-pill);
  transition: width var(--transition-normal);
}

/* ==========================================================================
   11. EMPTY, ERROR & LOADING SKELETON
   ========================================================================== */
.tech-empty-state {
  text-align: center;
  padding: var(--spacing-12) var(--spacing-4);
  color: var(--text-secondary);
}

.tech-empty-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-pill);
  background-color: var(--slate-100);
  color: var(--text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  margin-bottom: var(--spacing-3);
}

/* Loading Shimmer Skeleton */
.tech-skeleton {
  background: linear-gradient(90deg, #F1F5F9 25%, #E2E8F0 50%, #F1F5F9 75%);
  background-size: 200% 100%;
  animation: techShimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}

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

.skeleton-text {
  height: 14px;
  margin-bottom: 8px;
  width: 100%;
}

.skeleton-title {
  height: 20px;
  width: 60%;
  margin-bottom: 12px;
}

.skeleton-avatar {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-pill);
}

/* ==========================================================================
   12. TOAST NOTIFICATIONS & TOOLTIPS
   ========================================================================== */
.tech-toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1080;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.tech-toast {
  min-width: 300px;
  max-width: 380px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-3) var(--spacing-4);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-3);
  transform: translateX(100%);
  opacity: 0;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.tech-toast.show {
  transform: translateX(0);
  opacity: 1;
}

.tech-toast-success {
  border-left-color: var(--success-600);
}

.tech-toast-warning {
  border-left-color: var(--warning-500);
}

.tech-toast-danger {
  border-left-color: var(--danger-600);
}

/* File Preview Card */
.tech-file-preview {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-3) var(--spacing-4);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background-color: var(--bg-surface);
}

.tech-file-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.tech-file-icon {
  font-size: 1.5rem;
  color: var(--color-primary);
}

/* ==========================================================================
   13. BOOTSTRAP 5 COMPONENT OVERRIDES (ELIMINATE DEFAULT BLUE #0d6efd)
   ========================================================================== */

/* Primary Button Override */
.btn-primary {
  --bs-btn-color: #ffffff;
  --bs-btn-bg: #0D9488;
  --bs-btn-border-color: #0D9488;
  --bs-btn-hover-color: #ffffff;
  --bs-btn-hover-bg: #0F766E;
  --bs-btn-hover-border-color: #0F766E;
  --bs-btn-focus-shadow-rgb: 13, 148, 136;
  --bs-btn-active-color: #ffffff;
  --bs-btn-active-bg: #115E59;
  --bs-btn-active-border-color: #115E59;
  --bs-btn-disabled-color: #ffffff;
  --bs-btn-disabled-bg: #99F6E4;
  --bs-btn-disabled-border-color: #99F6E4;
  font-weight: 500;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(13, 148, 136, 0.28);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Outline Primary Button Override */
.btn-outline-primary {
  --bs-btn-color: #0D9488;
  --bs-btn-border-color: #0D9488;
  --bs-btn-hover-color: #ffffff;
  --bs-btn-hover-bg: #0D9488;
  --bs-btn-hover-border-color: #0D9488;
  --bs-btn-focus-shadow-rgb: 13, 148, 136;
  --bs-btn-active-color: #ffffff;
  --bs-btn-active-bg: #0F766E;
  --bs-btn-active-border-color: #0F766E;
  --bs-btn-disabled-color: #0D9488;
  --bs-btn-disabled-bg: transparent;
  --bs-btn-disabled-border-color: #99F6E4;
  font-weight: 500;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-outline-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 3px 8px rgba(13, 148, 136, 0.18);
}

/* Secondary Button Overrides */
.btn-outline-secondary {
  --bs-btn-color: #475569;
  --bs-btn-border-color: #CBD5E1;
  --bs-btn-hover-color: #0F172A;
  --bs-btn-hover-bg: #F1F5F9;
  --bs-btn-hover-border-color: #94A3B8;
  --bs-btn-focus-shadow-rgb: 100, 116, 139;
  font-weight: 500;
  transition: all 0.2s ease;
}

/* Form Controls & Focus Rings */
.form-control:focus,
.form-select:focus {
  border-color: #0D9488 !important;
  box-shadow: 0 0 0 0.25rem rgba(13, 148, 136, 0.2) !important;
  outline: none;
}

.form-check-input:checked {
  background-color: #0D9488 !important;
  border-color: #0D9488 !important;
}

.form-check-input:focus {
  border-color: #0D9488 !important;
  box-shadow: 0 0 0 0.25rem rgba(13, 148, 136, 0.2) !important;
}

/* Link Overrides */
a {
  color: #0D9488;
  text-decoration: none;
  transition: color 0.15s ease-in-out;
}

a:hover {
  color: #0F766E;
}

.text-primary {
  color: #0D9488 !important;
}

/* Pagination Overrides - Modern Independent Segmented Pills */
.pagination {
  gap: 6px;
  margin-bottom: 0;
}

.pagination .page-item .page-link {
  border-radius: var(--radius-md) !important;
  color: #1E293B;
  border: 1px solid #E2E8F0;
  background-color: #FFFFFF;
  padding: 0.375rem 0.75rem;
  min-width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 500;
  font-size: 0.875rem;
  transition: all 0.2s ease-in-out;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.pagination .page-item:not(.active):not(.disabled) .page-link:hover {
  background-color: #F0FDFA;
  border-color: #0D9488;
  color: #0D9488;
  transform: translateY(-1px);
}

.pagination .page-item.active .page-link {
  background-color: #0D9488 !important;
  border-color: #0D9488 !important;
  color: #FFFFFF !important;
  box-shadow: 0 2px 6px rgba(13, 148, 136, 0.3);
  font-weight: 600;
}

.pagination .page-item.disabled .page-link {
  color: #94A3B8;
  background-color: #F8FAFC;
  border-color: #E2E8F0;
  opacity: 0.65;
  cursor: not-allowed;
}

/* ==========================================================================
   14. GLOBAL UTILITY CLASSES FOR ENTERPRISE SAAS PALETTE
   ========================================================================== */
.text-navy {
  color: #0F172A !important;
}

.text-navy-muted {
  color: #334155 !important;
}

.bg-navy {
  background-color: #0F172A !important;
  color: #FFFFFF !important;
}

.text-teal {
  color: #0D9488 !important;
}

.bg-teal {
  background-color: #0D9488 !important;
  color: #FFFFFF !important;
}

.bg-teal-subtle {
  background-color: #F0FDFA !important;
  color: #0F766E !important;
  border: 1px solid #CCFBF1 !important;
}

.border-teal {
  border-color: #0D9488 !important;
}

.hover-teal:hover {
  color: #0D9488 !important;
}

.font-mono {
  font-family: var(--font-family-mono, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace) !important;
}

/* Contrast enhancement for badges */
.badge.bg-white {
  color: #0F172A !important;
  border: 1px solid #CBD5E1 !important;
  background-color: #FFFFFF !important;
  font-weight: 600;
}

.badge.bg-light {
  color: #1E293B !important;
  border: 1px solid #E2E8F0 !important;
  background-color: #F8FAFC !important;
}

#widget-tech-id {
  background-color: #F1F5F9 !important;
  color: #0F172A !important;
  border: 1px solid #94A3B8 !important;
  font-weight: 700;
  padding: 0.35rem 0.65rem;
}

/* User avatar fallback container */
.user-avatar-wrap,
.expert-avatar-wrap {
  position: relative;
  overflow: hidden;
  border-radius: 50%;
  border: 2px solid #E2E8F0;
  background-color: #F1F5F9;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.user-avatar-wrap img,
.expert-avatar-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ==========================================================================
   15. ACCESSIBILITY & PREFERS REDUCED MOTION
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}