/* =========================================================
   ZotaMate - Modern Responsive Design System
   Optimized for PC, Tablet, and Mobile
========================================================= */

/* =========================================================
   CSS Variables & Root Styles
========================================================= */
:root {
  /* Color Palette */
  --zm-primary: #2563eb;
  --zm-primary-dark: #1d4ed8;
  --zm-primary-light: #3b82f6;
  --zm-secondary: #64748b;
  --zm-success: #059669;
  --zm-warning: #d97706;
  --zm-danger: #dc2626;
  --zm-info: #0891b2;
  
  /* Neutral Colors */
  --zm-gray-50: #f8fafc;
  --zm-gray-100: #f1f5f9;
  --zm-gray-200: #e2e8f0;
  --zm-gray-300: #cbd5e1;
  --zm-gray-400: #94a3b8;
  --zm-gray-500: #64748b;
  --zm-gray-600: #475569;
  --zm-gray-700: #334155;
  --zm-gray-800: #1e293b;
  --zm-gray-900: #0f172a;
  
  /* Spacing */
  --zm-spacing-xs: 0.25rem;
  --zm-spacing-sm: 0.5rem;
  --zm-spacing-md: 1rem;
  --zm-spacing-lg: 1.5rem;
  --zm-spacing-xl: 2rem;
  --zm-spacing-2xl: 3rem;
  
  /* Border Radius */
  --zm-radius-sm: 0.375rem;
  --zm-radius-md: 0.5rem;
  --zm-radius-lg: 0.75rem;
  --zm-radius-xl: 1rem;
  --zm-radius-2xl: 1.5rem;
  
  /* Shadows */
  --zm-shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --zm-shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --zm-shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --zm-shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Transitions */
  --zm-transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-Index Scale */
  --zm-z-dropdown: 1000;
  --zm-z-sticky: 1020;
  --zm-z-fixed: 1030;
  --zm-z-modal-backdrop: 1040;
  --zm-z-modal: 1050;
  --zm-z-popover: 1060;
  --zm-z-tooltip: 1070;
}

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--zm-gray-800);
  background-color: var(--zm-gray-50);
  font-size: 16px;
  overflow-x: hidden;
}

/* =========================================================
   Typography
========================================================= */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: var(--zm-spacing-md);
  color: var(--zm-gray-900);
}

h1 { font-size: 2.25rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--zm-spacing-md);
  color: var(--zm-gray-700);
}

.text-primary { color: var(--zm-primary) !important; }
.text-secondary { color: var(--zm-secondary) !important; }
.text-success { color: var(--zm-success) !important; }
.text-warning { color: var(--zm-warning) !important; }
.text-danger { color: var(--zm-danger) !important; }
.text-info { color: var(--zm-info) !important; }

/* =========================================================
   Layout & Container
========================================================= */
.zm-body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.zm-main {
  flex: 1;
  padding: var(--zm-spacing-lg);
  background: linear-gradient(135deg, var(--zm-gray-50) 0%, var(--zm-gray-100) 100%);
}

.container-fluid {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--zm-spacing-md);
}

/* =========================================================
   Header & Navigation
========================================================= */
.zm-header {
  position: sticky;
  top: 0;
  z-index: var(--zm-z-fixed);
  background: linear-gradient(135deg, var(--zm-gray-800) 0%, var(--zm-gray-900) 100%);
  box-shadow: var(--zm-shadow-lg);
}

.navbar {
  padding: var(--zm-spacing-md) 0;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: white !important;
  text-decoration: none;
  transition: var(--zm-transition);
}

.navbar-brand:hover {
  color: var(--zm-gray-200) !important;
  transform: translateY(-1px);
}

.navbar-brand i {
  font-size: 1.75rem;
}

/* Navigation Links */
.navbar-nav .nav-link {
  color: var(--zm-gray-200) !important;
  font-weight: 500;
  padding: var(--zm-spacing-sm) var(--zm-spacing-md);
  border-radius: var(--zm-radius-md);
  transition: var(--zm-transition);
  position: relative;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link:focus {
  color: white !important;
  background-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}

.navbar-nav .nav-link.dropdown-toggle::after {
  margin-left: var(--zm-spacing-sm);
  transition: var(--zm-transition);
}

.navbar-nav .nav-link.dropdown-toggle[aria-expanded="true"]::after {
  transform: rotate(180deg);
}

/* Dropdown Menus */
.dropdown-menu {
  border: none;
  border-radius: var(--zm-radius-lg);
  box-shadow: var(--zm-shadow-xl);
  padding: var(--zm-spacing-sm);
  min-width: 280px;
  margin-top: var(--zm-spacing-sm);
}

.dropdown-menu-lg {
  min-width: 320px;
}

.dropdown-header {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--zm-spacing-sm) var(--zm-spacing-md);
  margin-bottom: var(--zm-spacing-xs);
}

.dropdown-item {
  border-radius: var(--zm-radius-md);
  padding: var(--zm-spacing-sm) var(--zm-spacing-md);
  transition: var(--zm-transition);
  font-weight: 500;
}

.dropdown-item:hover,
.dropdown-item:focus {
  background-color: var(--zm-gray-100);
  color: var(--zm-gray-900);
  transform: translateX(2px);
}

.dropdown-item i {
  width: 1.5rem;
  text-align: center;
}

.dropdown-item small {
  font-size: 0.75rem;
  opacity: 0.7;
}

/* User Avatar */
.zm-avatar {
  width: 2.5rem;
  height: 2.5rem;
  background: linear-gradient(135deg, var(--zm-primary) 0%, var(--zm-primary-light) 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1rem;
  box-shadow: var(--zm-shadow-md);
}

/* Mobile Navigation */
.navbar-toggler {
  border: none;
  padding: var(--zm-spacing-sm);
  border-radius: var(--zm-radius-md);
  transition: var(--zm-transition);
}

.navbar-toggler:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.navbar-toggler:focus {
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.25);
}

/* Offcanvas Mobile Menu */
.offcanvas {
  background: linear-gradient(135deg, var(--zm-gray-800) 0%, var(--zm-gray-900) 100%);
  border: none;
}

.offcanvas-header {
  border-bottom: 1px solid var(--zm-gray-700);
  padding: var(--zm-spacing-lg);
}

.offcanvas-title {
  color: white;
  font-weight: 700;
}

.btn-close {
  filter: invert(1);
}

.offcanvas-body {
  padding: 0;
}

/* Mobile Menu Items */
.offcanvas-body .btn {
  border-radius: var(--zm-radius-md);
  padding: var(--zm-spacing-md);
  font-weight: 500;
  text-align: left;
  transition: var(--zm-transition);
}

.offcanvas-body .btn:hover {
  transform: translateX(4px);
  background-color: var(--zm-gray-700);
}

/* =========================================================
   Buttons
========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--zm-spacing-sm) var(--zm-spacing-lg);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.5;
  border: none;
  border-radius: var(--zm-radius-md);
  cursor: pointer;
  transition: var(--zm-transition);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  vertical-align: middle;
  box-shadow: var(--zm-shadow-sm);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--zm-shadow-md);
}

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

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
}

/* Button Variants */
.btn-primary {
  background: linear-gradient(135deg, var(--zm-primary) 0%, var(--zm-primary-light) 100%);
  color: white;
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--zm-primary-dark) 0%, var(--zm-primary) 100%);
}

.btn-secondary {
  background: var(--zm-gray-600);
  color: white;
}

.btn-secondary:hover {
  background: var(--zm-gray-700);
}

.btn-success {
  background: linear-gradient(135deg, var(--zm-success) 0%, #10b981 100%);
  color: white;
}

.btn-warning {
  background: linear-gradient(135deg, var(--zm-warning) 0%, #f59e0b 100%);
  color: white;
}

.btn-danger {
  background: linear-gradient(135deg, var(--zm-danger) 0%, #ef4444 100%);
  color: white;
}

.btn-info {
  background: linear-gradient(135deg, var(--zm-info) 0%, #06b6d4 100%);
  color: white;
}

.btn-outline-light {
  background: transparent;
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline-light:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
  color: white;
}

/* Button Sizes */
.btn-sm {
  padding: var(--zm-spacing-xs) var(--zm-spacing-md);
  font-size: 0.75rem;
}

.btn-lg {
  padding: var(--zm-spacing-md) var(--zm-spacing-xl);
  font-size: 1rem;
}

/* =========================================================
   Cards
========================================================= */
.card {
  background: white;
  border: none;
  border-radius: var(--zm-radius-xl);
  box-shadow: var(--zm-shadow-md);
  transition: var(--zm-transition);
  overflow: hidden;
}

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

.card-header {
  background: linear-gradient(135deg, var(--zm-gray-50) 0%, var(--zm-gray-100) 100%);
  border-bottom: 1px solid var(--zm-gray-200);
  padding: var(--zm-spacing-lg);
}

.card-header h6 {
  margin: 0;
  color: var(--zm-gray-800);
  font-weight: 700;
}

.card-body {
  padding: var(--zm-spacing-lg);
}

.card-footer {
  background: var(--zm-gray-50);
  border-top: 1px solid var(--zm-gray-200);
  padding: var(--zm-spacing-md) var(--zm-spacing-lg);
}

/* =========================================================
   Forms
========================================================= */
.form-label {
  font-weight: 600;
  color: var(--zm-gray-800);
  margin-bottom: var(--zm-spacing-sm);
}

.form-control,
.form-select {
  border: 2px solid var(--zm-gray-200);
  border-radius: var(--zm-radius-md);
  padding: var(--zm-spacing-sm) var(--zm-spacing-md);
  font-size: 0.875rem;
  transition: var(--zm-transition);
  background-color: white;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--zm-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
  outline: none;
}

.form-control:disabled,
.form-select:disabled {
  background-color: var(--zm-gray-100);
  opacity: 0.6;
}

.form-text {
  font-size: 0.75rem;
  color: var(--zm-gray-600);
  margin-top: var(--zm-spacing-xs);
}

/* Form Switches */
.form-check-input {
  width: 2.5rem;
  height: 1.25rem;
  border-radius: 1rem;
  border: 2px solid var(--zm-gray-300);
  background-color: var(--zm-gray-200);
  transition: var(--zm-transition);
}

.form-check-input:checked {
  background-color: var(--zm-primary);
  border-color: var(--zm-primary);
}

.form-check-input:focus {
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25);
}

/* =========================================================
   Tables
========================================================= */
.table {
  background: white;
  border-radius: var(--zm-radius-lg);
  overflow: hidden;
  box-shadow: var(--zm-shadow-sm);
}

.table th {
  background: linear-gradient(135deg, var(--zm-gray-50) 0%, var(--zm-gray-100) 100%);
  border: none;
  font-weight: 600;
  color: var(--zm-gray-800);
  padding: var(--zm-spacing-md);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.table td {
  border: none;
  border-bottom: 1px solid var(--zm-gray-100);
  padding: var(--zm-spacing-md);
  vertical-align: middle;
}

.table tbody tr:hover {
  background-color: var(--zm-gray-50);
}

/* =========================================================
   Alerts
========================================================= */
.alert {
  border: none;
  border-radius: var(--zm-radius-lg);
  padding: var(--zm-spacing-lg);
  margin-bottom: var(--zm-spacing-lg);
  box-shadow: var(--zm-shadow-sm);
}

.alert-success {
  background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
  color: var(--zm-success);
  border-left: 4px solid var(--zm-success);
}

.alert-danger {
  background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
  color: var(--zm-danger);
  border-left: 4px solid var(--zm-danger);
}

.alert-warning {
  background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
  color: var(--zm-warning);
  border-left: 4px solid var(--zm-warning);
}

.alert-info {
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  color: var(--zm-info);
  border-left: 4px solid var(--zm-info);
}

/* =========================================================
   Badges
========================================================= */
.badge {
  font-size: 0.75rem;
  font-weight: 600;
  padding: var(--zm-spacing-xs) var(--zm-spacing-sm);
  border-radius: var(--zm-radius-sm);
}

.bg-success { background-color: var(--zm-success) !important; }
.bg-warning { background-color: var(--zm-warning) !important; }
.bg-danger { background-color: var(--zm-danger) !important; }
.bg-info { background-color: var(--zm-info) !important; }
.bg-secondary { background-color: var(--zm-secondary) !important; }

/* =========================================================
   Utilities
========================================================= */
.shadow-sm { box-shadow: var(--zm-shadow-sm) !important; }
.shadow { box-shadow: var(--zm-shadow-md) !important; }
.shadow-lg { box-shadow: var(--zm-shadow-lg) !important; }
.shadow-xl { box-shadow: var(--zm-shadow-xl) !important; }

.rounded { border-radius: var(--zm-radius-md) !important; }
.rounded-lg { border-radius: var(--zm-radius-lg) !important; }
.rounded-xl { border-radius: var(--zm-radius-xl) !important; }

.text-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* =========================================================
   Footer
========================================================= */
.zm-footer {
  background: linear-gradient(135deg, var(--zm-gray-800) 0%, var(--zm-gray-900) 100%);
  color: var(--zm-gray-300);
  border-top: 1px solid var(--zm-gray-700);
}

.zm-footer a {
  color: var(--zm-gray-400);
  text-decoration: none;
  transition: var(--zm-transition);
}

.zm-footer a:hover {
  color: white;
}

/* =========================================================
   Responsive Design
========================================================= */

/* Extra Small devices (phones, 576px and down) */
@media (max-width: 575.98px) {
  .zm-main {
    padding: var(--zm-spacing-md);
  }
  
  .container-fluid {
    padding: 0 var(--zm-spacing-sm);
  }
  
  .card-body {
    padding: var(--zm-spacing-md);
  }
  
  .card-header {
    padding: var(--zm-spacing-md);
  }
  
  .btn {
    width: 100%;
    margin-bottom: var(--zm-spacing-sm);
  }
  
  .table-responsive {
    font-size: 0.875rem;
  }
  
  .table th,
  .table td {
    padding: var(--zm-spacing-sm);
  }
  
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
}

/* Small devices (landscape phones, 576px and up) */
@media (min-width: 576px) and (max-width: 767.98px) {
  .zm-main {
    padding: var(--zm-spacing-lg);
  }
  
  .container-fluid {
    padding: 0 var(--zm-spacing-md);
  }
}

/* Medium devices (tablets, 768px and up) */
@media (min-width: 768px) and (max-width: 991.98px) {
  .zm-main {
    padding: var(--zm-spacing-xl);
  }
  
  .container-fluid {
    padding: 0 var(--zm-spacing-lg);
  }
}

/* Large devices (desktops, 992px and up) */
@media (min-width: 992px) {
  .zm-main {
    padding: var(--zm-spacing-2xl);
  }
  
  .container-fluid {
    padding: 0 var(--zm-spacing-xl);
  }
  
  .dropdown-menu {
    margin-top: var(--zm-spacing-md);
  }
}

/* Extra large devices (large desktops, 1200px and up) */
@media (min-width: 1200px) {
  .container-fluid {
    max-width: 1600px;
  }
}

/* =========================================================
   Dark Mode Support (Future Enhancement)
========================================================= */
@media (prefers-color-scheme: dark) {
  :root {
    --zm-gray-50: #0f172a;
    --zm-gray-100: #1e293b;
    --zm-gray-200: #334155;
    --zm-gray-300: #475569;
    --zm-gray-400: #64748b;
    --zm-gray-500: #94a3b8;
    --zm-gray-600: #cbd5e1;
    --zm-gray-700: #e2e8f0;
    --zm-gray-800: #f1f5f9;
    --zm-gray-900: #f8fafc;
  }
  
  body {
    background-color: var(--zm-gray-50);
    color: var(--zm-gray-800);
  }
  
  .card {
    background: var(--zm-gray-100);
  }
  
  .form-control,
  .form-select {
    background-color: var(--zm-gray-100);
    border-color: var(--zm-gray-300);
    color: var(--zm-gray-800);
  }
}

/* =========================================================
   Print Styles
========================================================= */
@media print {
  .zm-header,
  .zm-footer,
  .btn,
  .navbar-toggler {
    display: none !important;
  }
  
  .zm-main {
    padding: 0;
    background: white;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid var(--zm-gray-300);
  }
  
  .table {
    box-shadow: none;
    border: 1px solid var(--zm-gray-300);
  }
}

/* =========================================================
   Accessibility Improvements
========================================================= */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus indicators for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--zm-primary);
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .card {
    border: 2px solid var(--zm-gray-800);
  }
  
  .btn {
    border: 2px solid currentColor;
  }
}