/* Epulse Tutors Platform Stylesheet */
/* Clean, professional app-like design - No gradients */

/* Import Professional Font - Using DM Sans (clean, modern, professional) */
@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&display=swap');

/* CSS Variables for Consistent Theming */
:root {
  /* Primary Colors - Clean Blue Scheme */
  --primary-blue: #0066FF;
  --primary-blue-dark: #0052CC;
  --primary-blue-light: #E6F0FF;
  
  /* Neutral Colors */
  --white: #FFFFFF;
  --black: #000000;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --gray-900: #111827;
  
  /* Semantic Colors */
  --success: #10B981;
  --success-light: #D1FAE5;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;
  --error: #EF4444;
  --error-light: #FEE2E2;
  --info: #3B82F6;
  --info-light: #DBEAFE;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Bottom Nav Height */
  --bottom-nav-height: 64px;
}

/* Global Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Base Styles */
html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--white);
  color: var(--gray-900);
  line-height: 1.6;
  padding-bottom: var(--bottom-nav-height);
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

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

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

a:hover {
  color: var(--primary-blue-dark);
}

/* Layout Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md);
}

.page-header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: var(--spacing-lg) var(--spacing-md);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 0;
}

.page-subtitle {
  font-size: 0.875rem;
  color: var(--gray-600);
  margin-top: var(--spacing-xs);
}

/* Main Content Area */
.main-content {
  padding: var(--spacing-lg) var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
}

/* Cards */
.card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-900);
  margin: 0;
}

.card-body {
  color: var(--gray-700);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  gap: var(--spacing-sm);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary-blue);
  color: var(--white);
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-blue-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--gray-100);
  color: var(--gray-900);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--gray-200);
}

.btn-success {
  background: var(--success);
  color: var(--white);
}

.btn-success:hover:not(:disabled) {
  background: #0D9668;
}

.btn-danger {
  background: var(--error);
  color: var(--white);
}

.btn-danger:hover:not(:disabled) {
  background: #DC2626;
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--primary-blue);
  color: var(--primary-blue);
}

.btn-outline:hover:not(:disabled) {
  background: var(--primary-blue);
  color: var(--white);
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.75rem;
}

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

.btn-block {
  width: 100%;
  display: flex;
}

.btn-icon {
  padding: var(--spacing-sm);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: var(--spacing-sm);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 1rem;
  border: 2px solid var(--gray-300);
  border-radius: var(--radius-md);
  background: var(--white);
  color: var(--gray-900);
  transition: all var(--transition-fast);
  font-family: inherit;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  line-height: 1.5;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 4px var(--primary-blue-light);
  transform: translateY(-1px);
}

.form-input::placeholder {
  color: var(--gray-400);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-helper {
  font-size: 0.75rem;
  color: var(--gray-500);
  margin-top: var(--spacing-xs);
}

.form-error {
  font-size: 0.75rem;
  color: var(--error);
  margin-top: var(--spacing-xs);
}

.form-checkbox,
.form-radio {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  cursor: pointer;
}

.form-checkbox input[type="checkbox"],
.form-radio input[type="radio"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
}

/* File Upload */
.file-upload {
  border: 2px dashed var(--gray-300);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.file-upload:hover {
  border-color: var(--primary-blue);
  background: var(--primary-blue-light);
}

.file-upload input[type="file"] {
  display: none;
}

/* Badges & Tags */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

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

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

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

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

.badge-gray {
  background: var(--gray-100);
  color: var(--gray-700);
}

/* Alert Messages */
.alert {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.alert-success {
  background: var(--success-light);
  color: var(--success);
  border: 1px solid var(--success);
}

.alert-warning {
  background: var(--warning-light);
  color: var(--warning);
  border: 1px solid var(--warning);
}

.alert-error {
  background: var(--error-light);
  color: var(--error);
  border: 1px solid var(--error);
}

.alert-info {
  background: var(--info-light);
  color: var(--info);
  border: 1px solid var(--info);
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-md);
  animation: fadeIn 0.2s ease;
}

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

.modal {
  background: var(--white);
  border-radius: var(--radius-lg);
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-500);
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--gray-100);
  color: var(--gray-900);
}

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

.modal-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--gray-200);
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
}

/* Lists */
.list {
  list-style: none;
}

.list-item {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
  transition: background var(--transition-fast);
}

.list-item:last-child {
  border-bottom: none;
}

.list-item:hover {
  background: var(--gray-50);
}

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

/* Avatar */
.avatar {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  object-fit: cover;
  border: 2px solid var(--gray-200);
}

.avatar-lg {
  width: 80px;
  height: 80px;
}

.avatar-sm {
  width: 32px;
  height: 32px;
}

/* Rating Stars */
.rating {
  display: flex;
  gap: var(--spacing-xs);
  align-items: center;
}

.star {
  color: var(--gray-300);
  font-size: 1.125rem;
}

.star.filled {
  color: #FFA500;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-blue);
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--gray-600);
  font-weight: 500;
}

/* Chat Messages - Enhanced */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  min-height: 300px;
  max-height: 100%;
}

.chat-message {
  display: flex;
  gap: var(--spacing-sm);
  max-width: 80%;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.chat-message.sent {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.chat-message-bubble {
  background: var(--gray-100);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  word-wrap: break-word;
  overflow-wrap: break-word;
  max-width: 100%;
}

.chat-message.sent .chat-message-bubble {
  background: var(--primary-blue);
  color: var(--white);
}

.chat-message-time {
  font-size: 0.75rem;
  color: var(--gray-500);
  margin-top: var(--spacing-xs);
}

.chat-message.sent .chat-message-time {
  color: rgba(255, 255, 255, 0.8);
}

.chat-input-container {
  padding: var(--spacing-md);
  border-top: 1px solid var(--gray-200);
  display: flex;
  gap: var(--spacing-sm);
  background: var(--white);
  position: sticky;
  bottom: 0;
}

.chat-input {
  flex: 1;
  min-width: 0;
}

/* Table */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
  margin-bottom: var(--spacing-lg);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
}

thead {
  background: var(--gray-50);
}

th {
  padding: var(--spacing-md);
  text-align: left;
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--gray-700);
  border-bottom: 1px solid var(--gray-200);
}

td {
  padding: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--gray-900);
  border-bottom: 1px solid var(--gray-200);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover {
  background: var(--gray-50);
}

/* Tutor Profile Card */
.tutor-card {
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
  padding: var(--spacing-lg);
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.tutor-card:hover {
  border-color: var(--primary-blue);
  box-shadow: var(--shadow-md);
}

.tutor-card-avatar {
  width: 80px;
  height: 80px;
  flex-shrink: 0;
}

.tutor-card-content {
  flex: 1;
}

.tutor-card-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--spacing-xs);
}

.tutor-card-subjects {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin: var(--spacing-sm) 0;
}

.tutor-card-rate {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-blue);
  margin-top: var(--spacing-sm);
}

/* Video Player */
.video-container {
  position: relative;
  width: 100%;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--black);
}

video {
  width: 100%;
  display: block;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--gray-500);
  background: var(--gray-50);
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0;
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.3;
  color: var(--gray-400);
}

.empty-state-icon i {
  font-size: 4rem;
}

.empty-state-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: var(--spacing-sm);
}

.empty-state-text {
  font-size: 0.875rem;
  color: var(--gray-500);
}

/* Loading Spinner */
.spinner {
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary-blue);
  border-radius: var(--radius-full);
  width: 40px;
  height: 40px;
  animation: spin 0.8s linear infinite;
  margin: var(--spacing-xl) auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinner-sm {
  width: 20px;
  height: 20px;
  border-width: 2px;
}

/* Bottom Navigation Bar (App-Like) */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-height);
  background: var(--white);
  border-top: 1px solid var(--gray-200);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: 999;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  color: var(--gray-500);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  flex: 1;
  cursor: pointer;
}

.nav-item.active {
  color: var(--primary-blue);
}

.nav-item:hover {
  color: var(--primary-blue);
}

.nav-icon {
  font-size: 1.5rem;
}

.nav-label {
  font-size: 0.7rem;
}

.nav-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  background: var(--error);
  color: var(--white);
  font-size: 0.625rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  min-width: 18px;
  text-align: center;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary-blue); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }
.text-gray { color: var(--gray-500); }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.hidden { display: none; }
.block { display: block; }

/* Enhanced Responsive Design */
@media (max-width: 1024px) {
  .container {
    padding: var(--spacing-md);
  }
  
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --bottom-nav-height: 70px;
  }
  
  html {
    font-size: 15px;
  }
  
  .container {
    padding: var(--spacing-sm);
  }
  
  .main-content {
    padding: var(--spacing-md) var(--spacing-sm);
  }
  
  .card {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .dashboard-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .tutor-card {
    flex-direction: column;
    text-align: center;
  }
  
  .tutor-card-avatar {
    margin: 0 auto;
  }
  
  .chat-container {
    grid-template-columns: 1fr;
    max-height: calc(100vh - var(--bottom-nav-height) - 100px);
  }
  
  .chat-sidebar {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10;
    background: var(--white);
  }
  
  .chat-sidebar.show {
    display: block;
  }
  
  .chat-message {
    max-width: 85%;
  }
  
  .chat-message-bubble {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .form-input,
  .form-select,
  .form-textarea {
    font-size: 16px;
    padding: 14px 16px;
  }
  
  .btn {
    padding: 12px var(--spacing-lg);
    font-size: 1rem;
    min-height: 48px;
  }
  
  .btn-sm {
    padding: 10px var(--spacing-md);
    font-size: 0.875rem;
    min-height: 40px;
  }
  
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
  
  .page-header {
    padding: var(--spacing-md);
  }
  
  .modal {
    margin: var(--spacing-md);
    max-height: calc(100vh - 2 * var(--spacing-md));
  }
  
  .table-container {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  
  table {
    min-width: 600px;
  }
}

@media (max-width: 480px) {
  :root {
    --bottom-nav-height: 65px;
  }
  
  html {
    font-size: 14px;
  }
  
  .container {
    padding: var(--spacing-xs);
  }
  
  .main-content {
    padding: var(--spacing-sm);
  }
  
  .card {
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
  }
  
  .modal {
    max-width: 100%;
    margin: 0;
    border-radius: 0;
    max-height: 100vh;
  }
  
  .modal-header,
  .modal-body,
  .modal-footer {
    padding: var(--spacing-md);
  }
  
  .btn-block-mobile {
    width: 100%;
    display: flex;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .chat-container {
    border-radius: var(--radius-md);
    max-height: calc(100vh - var(--bottom-nav-height) - 80px);
  }
  
  .chat-messages {
    padding: var(--spacing-md);
  }
  
  .chat-input-container {
    padding: var(--spacing-sm);
  }
  
  .chat-message {
    max-width: 90%;
  }
  
  .form-input,
  .form-select,
  .form-textarea {
    font-size: 16px;
    padding: 14px 12px;
  }
  
  .btn {
    padding: 14px var(--spacing-md);
    font-size: 1rem;
    min-height: 50px;
  }
  
  .stat-card {
    flex-direction: column;
    text-align: center;
    padding: var(--spacing-md);
  }
  
  .stat-icon {
    width: 50px;
    height: 50px;
    font-size: 1.75rem;
    margin: 0 auto var(--spacing-sm);
  }
  
  .booking-header,
  .session-header,
  .review-header,
  .tutor-header,
  .user-header,
  .withdrawal-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }
  
  .booking-actions,
  .session-actions,
  .tutor-actions,
  .user-actions,
  .withdrawal-actions,
  .form-actions {
    flex-direction: column;
    width: 100%;
  }
  
  .booking-actions button,
  .session-actions button,
  .tutor-actions button,
  .user-actions button,
  .withdrawal-actions button,
  .form-actions button {
    width: 100%;
  }
  
  .bottom-nav {
    padding: var(--spacing-xs) 0;
  }
  
  .nav-item,
  .nav-btn {
    padding: var(--spacing-xs);
    font-size: 0.65rem;
  }
  
  .nav-icon {
    font-size: 1.25rem;
  }
  
  .nav-label {
    font-size: 0.65rem;
  }
  
  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }
  h3 { font-size: 1.125rem; }
}

@media (max-width: 360px) {
  html {
    font-size: 13px;
  }
  
  .chat-message {
    max-width: 95%;
  }
  
  .nav-label {
    display: none;
  }
  
  .bottom-nav {
    height: 56px;
  }
  
  :root {
    --bottom-nav-height: 56px;
  }
}

/* Print Styles */
@media print {
  .bottom-nav,
  .btn,
  .modal-overlay {
    display: none;
  }
  
  body {
    padding-bottom: 0;
  }
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus States for Keyboard Navigation */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--primary-blue);
  outline-offset: 2px;
}

/* Smooth Scrolling */
html {
  scroll-behavior: smooth;
}

/* Selection Color */
::selection {
  background: var(--primary-blue-light);
  color: var(--primary-blue);
}

/* ========================================
   TUTOR & ADMIN PAGE SPECIFIC STYLES
   ======================================== */

/* App Container */
.app-container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--gray-50);
}

/* App Header */
.app-header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: var(--spacing-lg) var(--spacing-md);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.app-header h1 {
  font-size: 1.5rem;
  margin: 0;
  color: var(--gray-900);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-sm);
}

.user-name {
  font-size: 0.875rem;
  color: var(--gray-700);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.btn-logout {
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--error);
  color: var(--white);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.btn-logout:hover {
  background: #DC2626;
  transform: translateY(-1px);
}

/* Status Banner */
.status-banner {
  padding: var(--spacing-md);
  text-align: center;
  font-weight: 500;
  font-size: 0.875rem;
}

.status-banner.status-pending {
  background: var(--warning-light);
  color: var(--warning);
  border-bottom: 2px solid var(--warning);
}

.status-banner.status-rejected {
  background: var(--error-light);
  color: var(--error);
  border-bottom: 2px solid var(--error);
}

/* App Main Content */
.app-main {
  flex: 1;
  padding: var(--spacing-lg) var(--spacing-md);
  padding-bottom: calc(var(--bottom-nav-height) + var(--spacing-lg));
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* Content Views */
.content-view {
  display: none;
}

.content-view.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* Dashboard Grid */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  transition: all var(--transition-normal);
}

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

.stat-icon {
  font-size: 2.5rem;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-blue-light);
  color: var(--primary-blue);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.stat-content {
  flex: 1;
}

.stat-content h3 {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--gray-600);
  margin: 0 0 var(--spacing-xs) 0;
}

.stat-content .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gray-900);
  margin: 0;
}

.stat-content small {
  font-size: 0.75rem;
  color: var(--gray-500);
}

/* Quick Actions */
.quick-actions {
  margin-top: var(--spacing-xl);
}

.quick-actions h2 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
}

.action-buttons {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
}

.action-btn {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  font-weight: 600;
  color: var(--gray-900);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.action-btn:hover {
  border-color: var(--primary-blue);
  background: var(--primary-blue-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Profile Container - Enhanced */
.profile-container {
  display: grid;
  gap: var(--spacing-xl);
  width: 100%;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  width: 100%;
}

.full-width {
  grid-column: 1 / -1;
}

.section-title {
  grid-column: 1 / -1;
  font-size: 1.125rem;
  color: var(--gray-900);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--gray-200);
}

.form-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  flex-wrap: wrap;
}

.upload-section {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  width: 100%;
}

.upload-section h3 {
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
}

.upload-section input[type="file"] {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-sm);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  width: 100%;
  font-size: 0.875rem;
}

.upload-section button {
  margin-top: var(--spacing-sm);
}

.upload-section small {
  display: block;
  margin-top: var(--spacing-xs);
  color: var(--gray-500);
  font-size: 0.75rem;
}

.current-media {
  margin: var(--spacing-md) 0;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gray-50);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
  overflow: hidden;
}

.current-media img,
.current-media video {
  max-width: 100%;
  max-height: 300px;
  border-radius: var(--radius-md);
  object-fit: contain;
}

.current-media:empty::after {
  content: 'No file uploaded';
  color: var(--gray-400);
  font-size: 0.875rem;
}

/* Tabs */
.tabs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--gray-200);
  overflow-x: auto;
}

.tab-btn {
  padding: var(--spacing-md) var(--spacing-lg);
  background: transparent;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--gray-600);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.tab-btn:hover {
  color: var(--primary-blue);
}

.tab-btn.active {
  color: var(--primary-blue);
  border-bottom-color: var(--primary-blue);
}

.tab-content {
  display: block;
}

.tab-content.hidden {
  display: none !important;
}

/* Booking Cards */
.booking-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  transition: all var(--transition-normal);
}

.booking-card:hover {
  box-shadow: var(--shadow-md);
}

.booking-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

.booking-header h3 {
  margin: 0;
  font-size: 1.125rem;
}

.booking-type {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--info-light);
  color: var(--info);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.booking-details {
  margin-bottom: var(--spacing-md);
}

.booking-details p {
  margin: var(--spacing-xs) 0;
  font-size: 0.875rem;
}

.booking-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* Session Cards */
.session-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.session-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.session-header h3 {
  margin: 0;
  font-size: 1.125rem;
}

.session-date {
  font-size: 0.875rem;
  color: var(--gray-600);
  font-weight: 600;
}

.session-details {
  margin-bottom: var(--spacing-md);
}

.session-details p {
  margin: var(--spacing-xs) 0;
  font-size: 0.875rem;
}

.session-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* Earnings Section */
.earnings-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.balance-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
}

.balance-card h3 {
  font-size: 0.875rem;
  color: var(--gray-600);
  margin-bottom: var(--spacing-sm);
}

.balance-amount {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary-blue);
  margin: var(--spacing-sm) 0;
}

.balance-card small {
  font-size: 0.75rem;
  color: var(--gray-500);
}

.withdrawal-section,
.withdrawal-history,
.earnings-history {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.info-text {
  padding: var(--spacing-md);
  background: var(--info-light);
  border-left: 4px solid var(--info);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-lg);
  font-size: 0.875rem;
}

.withdrawal-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.withdrawal-card.status-pending {
  border-left: 4px solid var(--warning);
}

.withdrawal-card.status-paid {
  border-left: 4px solid var(--success);
}

.withdrawal-card.status-rejected {
  border-left: 4px solid var(--error);
}

.withdrawal-info p {
  margin: var(--spacing-xs) 0;
  font-size: 0.875rem;
}

.earnings-record {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

.earnings-record:last-child {
  border-bottom: none;
}

.earnings-record p {
  margin: var(--spacing-xs) 0;
  font-size: 0.875rem;
}

/* Chat Container - Enhanced Responsive */
.chat-container {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 0;
  min-height: 500px;
  max-height: calc(100vh - var(--bottom-nav-height) - 120px);
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
}

.chat-sidebar {
  border-right: 1px solid var(--gray-200);
  overflow-y: auto;
}

.chat-contact {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
  cursor: pointer;
  transition: background var(--transition-fast);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-contact:hover {
  background: var(--gray-50);
}

.chat-contact.unread {
  background: var(--primary-blue-light);
}

.contact-info h4 {
  margin: 0 0 var(--spacing-xs) 0;
  font-size: 0.875rem;
}

.last-message {
  font-size: 0.75rem;
  color: var(--gray-600);
  margin: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.unread-badge {
  background: var(--error);
  color: var(--white);
  font-size: 0.625rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  min-width: 18px;
  text-align: center;
}

.chat-main {
  display: flex;
  flex-direction: column;
}

#chat-header {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

#chat-header h3 {
  margin: 0;
  font-size: 1rem;
}

#chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.message-content {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--gray-100);
  border-radius: var(--radius-md);
  max-width: 70%;
}

.chat-message.sent .message-content {
  background: var(--primary-blue);
  color: var(--white);
  margin-left: auto;
}

.message-time {
  font-size: 0.625rem;
  color: var(--gray-500);
  margin-top: var(--spacing-xs);
}

.chat-message.sent .message-time {
  color: rgba(255, 255, 255, 0.8);
  text-align: right;
}

#chat-input-container {
  padding: var(--spacing-md);
  border-top: 1px solid var(--gray-200);
}

#chat-form {
  display: flex;
  gap: var(--spacing-sm);
}

#chat-form input {
  flex: 1;
}

/* Review Cards */
.review-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.review-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
}

.review-header h3 {
  margin: 0;
  font-size: 1rem;
}

.review-text {
  font-size: 0.875rem;
  color: var(--gray-700);
  margin-bottom: var(--spacing-sm);
}

.review-date {
  font-size: 0.75rem;
  color: var(--gray-500);
}

/* Notification Cards */
.notification-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.notification-card:hover {
  background: var(--gray-50);
}

.notification-card.unread {
  background: var(--primary-blue-light);
  border-color: var(--primary-blue);
}

.notification-card h4 {
  margin: 0 0 var(--spacing-xs) 0;
  font-size: 0.875rem;
}

.notification-card p {
  margin: 0 0 var(--spacing-xs) 0;
  font-size: 0.875rem;
  color: var(--gray-700);
}

.notification-card small {
  font-size: 0.75rem;
  color: var(--gray-500);
}

/* History Items */
.history-item {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

.history-item:last-child {
  border-bottom: none;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xs);
}

.action-type {
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--gray-100);
  color: var(--gray-700);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
}

.history-time {
  font-size: 0.75rem;
  color: var(--gray-500);
}

.history-item p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--gray-700);
}

/* Tutor/User Cards for Admin */
.tutor-card,
.user-card,
.withdrawal-card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

.tutor-header,
.user-header,
.withdrawal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

.tutor-header h3,
.user-header h3,
.withdrawal-header h3 {
  margin: 0;
  font-size: 1.125rem;
}

.tutor-details,
.user-details,
.withdrawal-details {
  margin-bottom: var(--spacing-md);
}

.tutor-details p,
.user-details p,
.withdrawal-details p {
  margin: var(--spacing-xs) 0;
  font-size: 0.875rem;
}

.tutor-actions,
.user-actions,
.withdrawal-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* Filter Controls */
.filter-controls {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

.filter-controls select {
  flex: 1;
  min-width: 200px;
}

/* Settings Form */
.settings-form {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
}

#settings-fields {
  display: grid;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

/* Report Section */
.report-section {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.report-section h3 {
  margin-bottom: var(--spacing-md);
}

/* Toast Notification */
.toast {
  position: fixed;
  bottom: calc(var(--bottom-nav-height) + var(--spacing-lg));
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--gray-900);
  color: var(--white);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  z-index: 9999;
  opacity: 0;
  transition: all var(--transition-normal);
  max-width: 90%;
  text-align: center;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

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

.toast.error {
  background: var(--error);
}

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

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

/* Bottom Navigation Enhancements */
.nav-btn {
  background: none;
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  color: var(--gray-500);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  flex: 1;
  cursor: pointer;
  position: relative;
}

.nav-btn.active {
  color: var(--primary-blue);
}

.nav-btn:hover {
  color: var(--primary-blue);
}

.nav-btn .nav-icon {
  font-size: 1.5rem;
}

.nav-btn .nav-label {
  font-size: 0.7rem;
}

/* Enhanced Responsive Adjustments for Tutor/Admin Pages */
@media (max-width: 1024px) {
  .app-main {
    padding: var(--spacing-lg) var(--spacing-md);
  }
  
  .form-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .app-header {
    padding: var(--spacing-md) var(--spacing-sm);
  }
  
  .app-header h1 {
    font-size: 1.25rem;
  }
  
  .header-actions {
    flex-wrap: wrap;
    gap: var(--spacing-sm);
  }
  
  .app-main {
    padding: var(--spacing-md) var(--spacing-sm);
  }
  
  .dashboard-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .action-buttons {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }
  
  .form-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .earnings-summary {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .balance-card {
    padding: var(--spacing-md);
  }
  
  .tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  
  .tabs::-webkit-scrollbar {
    display: none;
  }
  
  .tab-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
  }
  
  .filter-controls {
    flex-direction: column;
  }
  
  .filter-controls select {
    width: 100%;
    min-width: 100%;
  }
}

@media (max-width: 480px) {
  .app-header {
    padding: var(--spacing-sm);
  }
  
  .app-header h1 {
    font-size: 1.125rem;
  }
  
  .header-actions {
    width: 100%;
    justify-content: space-between;
  }
  
  .user-name {
    font-size: 0.75rem;
  }
  
  .btn-logout {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
  }
  
  .app-main {
    padding: var(--spacing-sm);
  }
  
  .stat-card {
    flex-direction: column;
    text-align: center;
    padding: var(--spacing-md);
  }
  
  .stat-icon {
    width: 50px;
    height: 50px;
    font-size: 1.75rem;
    margin: 0 auto var(--spacing-sm);
  }
  
  .stat-content h3 {
    font-size: 0.75rem;
  }
  
  .stat-content .stat-value {
    font-size: 1.5rem;
  }
  
  .action-btn {
    padding: var(--spacing-md);
    font-size: 0.875rem;
  }
  
  .booking-card,
  .session-card,
  .review-card,
  .tutor-card,
  .user-card,
  .withdrawal-card {
    padding: var(--spacing-md);
  }
  
  .tab-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8rem;
  }
}

/* Details/Summary Styling */
details {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--gray-50);
  border-radius: var(--radius-md);
  border: 1px solid var(--gray-200);
}

summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--primary-blue);
  padding: var(--spacing-xs);
  user-select: none;
}

summary:hover {
  color: var(--primary-blue-dark);
}

details[open] summary {
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--gray-200);
}

details pre {
  background: var(--white);
  padding: var(--spacing-md);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-size: 0.75rem;
  line-height: 1.5;
  margin: 0;
}

/* ========================================
   ADDITIONAL RESPONSIVE ENHANCEMENTS
   ======================================== */

/* Improved Touch Targets for Mobile */
@media (max-width: 768px) {
  button,
  a.btn,
  .nav-item,
  .nav-btn,
  .action-btn {
    min-height: 44px;
    min-width: 44px;
  }
  
  .chat-contact {
    min-height: 60px;
    padding: var(--spacing-md);
  }
  
  .list-item {
    min-height: 56px;
    padding: var(--spacing-md);
  }
}

/* Prevent Horizontal Scroll */
body {
  overflow-x: hidden;
  width: 100%;
  max-width: 100vw;
}

.container,
.app-main,
.main-content {
  max-width: 100%;
  overflow-x: hidden;
}

/* Better Input Styling for Mobile */
@media (max-width: 768px) {
  .form-input,
  .form-select,
  .form-textarea {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }
  
  .form-input:focus,
  .form-select:focus,
  .form-textarea:focus {
    box-shadow: 0 0 0 3px var(--primary-blue-light);
  }
}

/* Improved Chat Container for Mobile */
@media (max-width: 768px) {
  .chat-container {
    position: relative;
    display: flex;
    flex-direction: column;
    height: auto;
    min-height: 400px;
    max-height: calc(100vh - var(--bottom-nav-height) - 100px);
  }
  
  .chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
  }
  
  #chat-messages {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
  }
  
  #chat-input-container {
    flex-shrink: 0;
  }
}

/* Better Scrolling for Lists */
.chat-messages,
.chat-sidebar,
.list,
.table-container {
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--gray-400) var(--gray-100);
}

.chat-messages::-webkit-scrollbar,
.chat-sidebar::-webkit-scrollbar,
.list::-webkit-scrollbar,
.table-container::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.chat-messages::-webkit-scrollbar-track,
.chat-sidebar::-webkit-scrollbar-track,
.list::-webkit-scrollbar-track,
.table-container::-webkit-scrollbar-track {
  background: var(--gray-100);
}

.chat-messages::-webkit-scrollbar-thumb,
.chat-sidebar::-webkit-scrollbar-thumb,
.list::-webkit-scrollbar-thumb,
.table-container::-webkit-scrollbar-thumb {
  background: var(--gray-400);
  border-radius: var(--radius-full);
}

/* Improved Modal for Mobile */
@media (max-width: 768px) {
  .modal-overlay {
    padding: 0;
    align-items: flex-end;
  }
  
  .modal {
    max-width: 100%;
    width: 100%;
    max-height: 90vh;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    margin: 0;
  }
}

@media (max-width: 480px) {
  .modal-overlay {
    align-items: stretch;
  }
  
  .modal {
    max-height: 100vh;
    border-radius: 0;
  }
}

/* Better Card Layouts on Mobile */
@media (max-width: 768px) {
  .booking-card,
  .session-card,
  .tutor-card,
  .user-card,
  .withdrawal-card,
  .review-card {
    border-radius: var(--radius-md);
  }
  
  .card-header,
  .booking-header,
  .session-header,
  .tutor-header,
  .user-header,
  .withdrawal-header,
  .review-header {
    flex-wrap: wrap;
  }
}

/* Improved Stats Grid */
@media (max-width: 768px) {
  .stats-grid,
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  
  .stat-card {
    min-height: auto;
  }
}

@media (min-width: 480px) and (max-width: 768px) {
  .stats-grid,
  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Better Typography Scaling */
@media (max-width: 768px) {
  body {
    font-size: 15px;
    line-height: 1.6;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 14px;
    line-height: 1.5;
  }
}

/* Improved Button Groups */
@media (max-width: 768px) {
  .form-actions,
  .booking-actions,
  .session-actions,
  .tutor-actions,
  .user-actions,
  .withdrawal-actions {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
  
  .form-actions .btn,
  .booking-actions .btn,
  .session-actions .btn,
  .tutor-actions .btn,
  .user-actions .btn,
  .withdrawal-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

/* Better Table Responsiveness */
@media (max-width: 768px) {
  .table-container {
    border-radius: var(--radius-md);
    margin-left: calc(-1 * var(--spacing-sm));
    margin-right: calc(-1 * var(--spacing-sm));
    width: calc(100% + 2 * var(--spacing-sm));
  }
  
  table {
    font-size: 0.875rem;
  }
  
  th,
  td {
    padding: var(--spacing-sm);
  }
}

/* Improved Empty States */
.empty-state {
  padding: var(--spacing-xl);
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

@media (max-width: 480px) {
  .empty-state {
    padding: var(--spacing-lg);
    min-height: 150px;
  }
  
  .empty-state-icon {
    font-size: 3rem;
  }
}

/* Better Badge Layouts */
.tutor-card-subjects,
.badge-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  align-items: center;
}

/* Improved Loading States */
.spinner-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  width: 100%;
}

/* Better Focus Indicators */
@media (max-width: 768px) {
  button:focus-visible,
  a:focus-visible,
  input:focus-visible,
  select:focus-visible,
  textarea:focus-visible {
    outline: 3px solid var(--primary-blue);
    outline-offset: 2px;
  }
}

/* Improved Toast Notifications for Mobile */
@media (max-width: 768px) {
  .toast {
    bottom: calc(var(--bottom-nav-height) + var(--spacing-md));
    left: var(--spacing-md);
    right: var(--spacing-md);
    transform: translateX(0) translateY(100px);
    max-width: none;
    width: auto;
  }
  
  .toast.show {
    transform: translateX(0) translateY(0);
  }
}

/* Better Avatar Sizing */
@media (max-width: 480px) {
  .avatar {
    width: 36px;
    height: 36px;
  }
  
  .avatar-lg {
    width: 64px;
    height: 64px;
  }
  
  .avatar-sm {
    width: 28px;
    height: 28px;
  }
}

/* Improved Tabs for Mobile */
@media (max-width: 768px) {
  .tabs {
    margin-left: calc(-1 * var(--spacing-sm));
    margin-right: calc(-1 * var(--spacing-sm));
    padding-left: var(--spacing-sm);
    padding-right: var(--spacing-sm);
  }
}

/* Better Spacing for Mobile */
@media (max-width: 480px) {
  .card,
  .booking-card,
  .session-card,
  .tutor-card,
  .user-card,
  .withdrawal-card,
  .review-card {
    margin-bottom: var(--spacing-sm);
  }
  
  .form-group {
    margin-bottom: var(--spacing-md);
  }
}

/* Landscape Mobile Optimizations */
@media (max-width: 768px) and (orientation: landscape) {
  .chat-container {
    max-height: calc(100vh - var(--bottom-nav-height) - 60px);
  }
  
  .modal {
    max-height: 85vh;
  }
}

/* High DPI Screens */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .form-input,
  .form-select,
  .form-textarea,
  .btn {
    border-width: 1px;
  }
}

/* Dark Mode Support (Optional) */
@media (prefers-color-scheme: dark) {
  /* Add dark mode styles here if needed */
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}

/* Print Optimizations */
@media print {
  .bottom-nav,
  .btn,
  .modal-overlay,
  .chat-input-container,
  .form-actions,
  .booking-actions,
  .session-actions,
  .tutor-actions,
  .user-actions,
  .withdrawal-actions {
    display: none !important;
  }
  
  body {
    padding-bottom: 0;
    background: white;
  }
  
  .card,
  .booking-card,
  .session-card,
  .tutor-card {
    border: 1px solid #000;
    page-break-inside: avoid;
  }
}

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

/* Skip to Content Link */
.skip-to-content {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-blue);
  color: var(--white);
  padding: var(--spacing-sm) var(--spacing-md);
  text-decoration: none;
  z-index: 10000;
}

.skip-to-content:focus {
  top: 0;
}

/* Better Loading States */
.loading {
  pointer-events: none;
  opacity: 0.6;
  position: relative;
}

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--primary-blue);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

/* Improved Error States */
.error-state {
  padding: var(--spacing-xl);
  text-align: center;
  color: var(--error);
}

.error-state i {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

/* Better Success States */
.success-state {
  padding: var(--spacing-xl);
  text-align: center;
  color: var(--success);
}

.success-state i {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

/* Improved Disabled States */
.disabled,
[disabled] {
  opacity: 0.5;
  cursor: not-allowed !important;
  pointer-events: none;
}

/* Better Hover States for Touch Devices */
@media (hover: none) {
  .btn:hover,
  .card:hover,
  .list-item:hover,
  .chat-contact:hover {
    transform: none;
    box-shadow: none;
  }
  
  .btn:active {
    transform: scale(0.98);
  }
}

/* Improved Safe Area for Notched Devices */
@supports (padding: max(0px)) {
  body {
    padding-left: max(0px, env(safe-area-inset-left));
    padding-right: max(0px, env(safe-area-inset-right));
  }
  
  .bottom-nav {
    padding-bottom: max(0px, env(safe-area-inset-bottom));
  }
  
  .page-header,
  .app-header {
    padding-top: max(var(--spacing-lg), env(safe-area-inset-top));
  }
}