/* ========================================
   SCHOOL MANAGEMENT SYSTEM - MODERN STYLES
   ======================================== */

/* CSS Variables for Theming */
:root {
  /* Primary Colors */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --secondary: #06b6d4;
  --accent: #f59e0b;
  
  /* Background Colors */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-light: #f8fafc;
  --bg-white: #ffffff;
  
  /* Text Colors */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-light: #94a3b8;
  --text-white: #ffffff;
  
  /* Status Colors */
  --success: #10b981;
  --success-light: #d1fae5;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --info: #3b82f6;
  --info-light: #dbeafe;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Spacing */
  --sidebar-width: 260px;
  --sidebar-collapsed: 70px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-light);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

p {
  color: var(--text-secondary);
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-fast);
}

/* ========================================
   SIDEBAR
   ======================================== */
.sidebar {
  width: var(--sidebar-width);
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  color: var(--text-white);
  height: 100vh;
  height: 100dvh;
  position: fixed;
  left: 0;
  top: 0;
  display: flex;
  flex-direction: column;
  padding: 1rem;
  box-shadow: var(--shadow-xl);
  z-index: 1000;
  transition: transform var(--transition);
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--bg-tertiary);
  margin-bottom: 0.5rem;
  flex-shrink: 0;
}

.sidebar-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: bold;
}

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

.sidebar-subtitle {
  font-size: 0.75rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
}

.nav-section {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-light);
  margin: 1.25rem 0.75rem 0.5rem 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--bg-tertiary);
}

.nav-section:first-of-type {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.nav-items {
  display: flex;
  flex-direction: column;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.75rem 1rem;
  margin: 0.125rem 0;
  border-radius: var(--radius);
  color: var(--text-light);
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}

.nav-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 3px;
  background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
  transform: scaleY(0);
  transition: transform var(--transition-fast);
}

.nav-link:hover {
  background: var(--bg-tertiary);
  color: var(--text-white);
}

.nav-link:hover::before {
  transform: scaleY(1);
}

.nav-link.active {
  background: linear-gradient(90deg, rgba(99, 102, 241, 0.15) 0%, transparent 100%);
  color: var(--text-white);
}

.nav-link.active::before {
  transform: scaleY(1);
}

.nav-link i {
  font-size: 1.125rem;
  width: 24px;
  text-align: center;
}

.sidebar-footer {
  padding-top: 0.75rem;
  border-top: 1px solid var(--bg-tertiary);
  margin-top: auto;
  flex-shrink: 0;
}

.logout-btn {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  color: var(--danger);
  font-weight: 500;
  transition: all var(--transition-fast);
  cursor: pointer;
  width: 100%;
  background: transparent;
  border: none;
  font-size: inherit;
  font-family: inherit;
}

.logout-btn:hover {
  background: rgba(239, 68, 68, 0.1);
}

/* Mobile Menu Toggle */
.mobile-toggle {
  display: none;
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 1001;
  width: 44px;
  height: 44px;
  background: var(--bg-white);
  border: none;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--text-primary);
}

/* ========================================
   MAIN CONTENT
   ======================================== */
.main {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 2rem;
  min-height: 100vh;
  transition: margin-left var(--transition);
}

.page-header {
  margin-bottom: 2rem;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

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

.page-title {
  font-size: 1.875rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========================================
   CARDS
   ======================================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-white);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.stat-card.primary::before { background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%); }
.stat-card.success::before { background: linear-gradient(90deg, var(--success) 0%, #34d399 100%); }
.stat-card.warning::before { background: linear-gradient(90deg, var(--warning) 0%, #fbbf24 100%); }
.stat-card.danger::before { background: linear-gradient(90deg, var(--danger) 0%, #f87171 100%); }

.stat-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.stat-card.primary .stat-icon { background: var(--info-light); color: var(--primary); }
.stat-card.success .stat-icon { background: var(--success-light); color: var(--success); }
.stat-card.warning .stat-icon { background: var(--warning-light); color: var(--warning); }
.stat-card.danger .stat-icon { background: var(--danger-light); color: var(--danger); }

.stat-value {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
}

.stat-label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.stat-change {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-full);
  margin-top: 0.75rem;
}

.stat-change.positive {
  background: var(--success-light);
  color: var(--success);
}

.stat-change.negative {
  background: var(--danger-light);
  color: var(--danger);
}

/* Content Card */
.content-card {
  background: var(--bg-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.content-card-header {
  padding: 1.5rem;
  border-bottom: 1px solid #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.content-card-title {
  font-size: 1.125rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.content-card-body {
  padding: 1.5rem;
}

/* ========================================
   FORMS
   ======================================== */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.form-input,
.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid #e2e8f0;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-family: inherit;
  background: var(--bg-white);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-input::placeholder {
  color: var(--text-light);
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2364748b' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

/* Search Input */
.search-box {
  position: relative;
  max-width: 400px;
}

.search-box input {
  padding-left: 2.75rem;
}

.search-box i {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-light);
}

/* ========================================
   BUTTONS
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--text-white);
  box-shadow: 0 4px 6px -1px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 12px -2px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: var(--bg-white);
  color: var(--text-primary);
  border: 2px solid #e2e8f0;
}

.btn-secondary:hover:not(:disabled) {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-success {
  background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
  color: var(--text-white);
  box-shadow: 0 4px 6px -1px rgba(16, 185, 129, 0.3);
}

.btn-success:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 12px -2px rgba(16, 185, 129, 0.4);
}

.btn-danger {
  background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
  color: var(--text-white);
  box-shadow: 0 4px 6px -1px rgba(239, 68, 68, 0.3);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* ========================================
   TABLES
   ======================================== */
.table-container {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid #e2e8f0;
}

.data-table th {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: var(--bg-light);
}

.data-table tbody tr {
  transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
  background: var(--bg-light);
}

.data-table td {
  font-size: 0.9375rem;
  color: var(--text-primary);
}

/* Status Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

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

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

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

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

/* ========================================
   TOAST NOTIFICATIONS
   ======================================== */
.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  background: var(--bg-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-xl);
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.875rem;
  min-width: 320px;
  max-width: 420px;
  animation: slideIn 0.3s ease;
  border-left: 4px solid;
}

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

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

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

.toast.info {
  border-left-color: var(--info);
}

.toast-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.toast.success .toast-icon {
  background: var(--success-light);
  color: var(--success);
}

.toast.error .toast-icon {
  background: var(--danger-light);
  color: var(--danger);
}

.toast.warning .toast-icon {
  background: var(--warning-light);
  color: var(--warning);
}

.toast.info .toast-icon {
  background: var(--info-light);
  color: var(--info);
}

.toast-content {
  flex: 1;
}

.toast-title {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9375rem;
}

.toast-message {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 0.125rem;
}

.toast-close {
  background: none;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  padding: 0.25rem;
  font-size: 1rem;
  transition: color var(--transition-fast);
}

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

.toast.hiding {
  animation: slideOut 0.3s ease forwards;
}

/* ========================================
   LOADING SPINNER
   ======================================== */
.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid rgba(99, 102, 241, 0.2);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-sm {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 4px;
}

.btn .spinner {
  width: 16px;
  height: 16px;
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: white;
}

.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9998;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition);
}

.loading-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ========================================
   LOGIN PAGE
   ======================================== */
.login-page {
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--primary-dark) 100%);
  padding: 1rem;
  margin: 0;
}

.login-container {
  width: 100%;
  max-width: 420px;
}

.login-card {
  background: var(--bg-white);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: 2.5rem;
  position: relative;
  overflow: hidden;
}

.login-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
}

.login-logo {
  text-align: center;
  margin-bottom: 2rem;
}

.login-logo-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  border-radius: var(--radius-lg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: white;
  margin-bottom: 1rem;
}

.login-logo h1 {
  font-size: 1.5rem;
  font-weight: 800;
}

.login-logo p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.login-form .form-group {
  margin-bottom: 1.25rem;
}

.login-form .btn {
  width: 100%;
  margin-top: 0.5rem;
}

.login-footer {
  text-align: center;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e2e8f0;
}

.login-footer a {
  color: var(--primary);
  font-weight: 500;
}

.login-footer a:hover {
  text-decoration: underline;
}

/* ========================================
   HERO SECTION (Landing Page)
   ======================================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--primary-dark) 100%);
  color: white;
  padding: 2rem;
  position: relative;
  overflow: hidden;
  margin: 0;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: white;
  line-height: 1.1;
}

.hero h1 span {
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.hero .btn-primary {
  font-size: 1.125rem;
  padding: 1rem 2.5rem;
}

.hero .btn-secondary {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border-color: rgba(255, 255, 255, 0.2);
  font-size: 1.125rem;
  padding: 1rem 2.5rem;
}

.hero .btn-secondary:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.3);
  color: white;
}

/* Features Section */
.features {
  padding: 5rem 2rem;
  background: var(--bg-light);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.feature-card {
  background: var(--bg-white);
  padding: 2rem;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
  border-radius: var(--radius-lg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: white;
  margin-bottom: 1.25rem;
}

.feature-card h3 {
  margin-bottom: 0.75rem;
}

.feature-card p {
  color: var(--text-secondary);
}

/* Footer */
.footer {
  background: var(--bg-primary);
  color: var(--text-light);
  padding: 2rem;
  text-align: center;
}

.footer p {
  color: var(--text-light);
}

/* ========================================
   ANIMATIONS
   ======================================== */
@keyframes spin {
  to { transform: rotate(360deg); }
}

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

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

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    width: 280px;
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main {
    margin-left: 0;
    padding: 1.5rem;
    padding-top: 5rem;
  }
  
  .mobile-toggle {
    display: flex;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .toast-container {
    left: 1rem;
    right: 1rem;
    top: 1rem;
  }
  
  .toast {
    min-width: unset;
    max-width: unset;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .login-card {
    padding: 1.5rem;
  }
  
  .stat-value {
    font-size: 1.5rem;
  }
}

/* Sidebar overlay for mobile */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  transition: opacity var(--transition);
}

@media (max-width: 768px) {
  .sidebar-overlay.active {
    display: block;
    opacity: 1;
  }
}

/* Print styles */
@media print {
  .sidebar,
  .mobile-toggle,
  .btn {
    display: none !important;
  }
  
  .main {
    margin-left: 0;
  }
}