/* StudyFlex - Color scheme */
:root {
   --primary: #020adb;
    --primary-dark: #1e40af;
 --secondary: #64748b;
  --background: #F9FAFB;
  --card-bg: #ffffff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --border-color: #e5e7eb;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #DC2626;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--background);
  color: var(--text-primary);
  line-height: 1.6;
}

/* Header Navigation */
.navbar {
  background: var(--card-bg);
  box-shadow: var(--shadow);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.navbar-menu {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.navbar-menu a {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 500;
  transition: color 0.3s;
}

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

.navbar-menu a.active {
  color: var(--primary);
  border-bottom: 2px solid var(--primary);
  padding-bottom: 0.25rem;
}

.nav-right {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

/* Sidebar Layout */
.layout {
  display: grid;
  grid-template-columns: 250px 1fr;
  grid-template-rows: auto 1fr;
  min-height: 100vh;
}

.navbar {
  grid-column: 1 / -1;
}

.sidebar {
  background: var(--card-bg);
  border-right: 1px solid var(--border-color);
  padding: 1.5rem 0;
  overflow-y: auto;
}

.sidebar-menu {
  list-style: none;
}

.sidebar-menu li {
  margin-bottom: 0.5rem;
}

.sidebar-menu a {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1.5rem;
  color: var(--text-primary);
  text-decoration: none;
  transition: all 0.3s;
}

.sidebar-menu a:hover {
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
}

.sidebar-menu a.active {
  background: rgba(79, 70, 229, 0.1);
  color: var(--primary);
  border-right: 3px solid var(--primary);
}

.main-content {
  padding: 2rem;
  overflow-y: auto;
}

/* Cards and Components */
.card {
  background: var(--card-bg);
  border-radius: 0.5rem;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.3s;
}

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

.card-header {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
}

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

.btn-secondary:hover {
  background: rgba(79, 70, 229, 0.1);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

.btn-block {
  width: 100%;
  justify-content: center;
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-container {
  max-width: 400px;
  margin: 0 auto;
  padding: 2rem;
}

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.table thead {
  background: rgba(79, 70, 229, 0.05);
}

.table th,
.table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.table tbody tr:hover {
  background: rgba(79, 70, 229, 0.02);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 500;
}

.badge-primary {
  background: rgba(79, 70, 229, 0.2);
  color: var(--primary);
}

.badge-success {
  background: rgba(16, 185, 129, 0.2);
  color: var(--success);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.2);
  color: var(--warning);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}

.modal.show {
  display: flex;
}

.modal-content {
  background: var(--card-bg);
  border-radius: 0.5rem;
  padding: 2rem;
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
}

/* Chat/Tutor Styles */
.chat-container {
  display: flex;
  flex-direction: column;
  height: 600px;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  overflow: hidden;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.message {
  display: flex;
  gap: 0.75rem;
}

.message.user {
  justify-content: flex-end;
}

.message-bubble {
  max-width: 70%;
  padding: 0.75rem 1rem;
  border-radius: 0.5rem;
  word-wrap: break-word;
}

.message.assistant .message-bubble {
  background: rgba(79, 70, 229, 0.1);
  color: var(--text-primary);
}

.message.user .message-bubble {
  background: var(--primary);
  color: white;
}

.chat-input {
  display: flex;
  gap: 0.5rem;
  padding: 1rem;
  border-top: 1px solid var(--border-color);
}

.chat-input input {
  flex: 1;
}

/* Progress Bar */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--border-color);
  border-radius: 4px;
  overflow: hidden;
  margin: 0.5rem 0;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  transition: width 0.3s;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 0.5rem;
  text-align: center;
  box-shadow: var(--shadow);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
  margin: 0.5rem 0;
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Loading */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: none;
  }

  .navbar-menu {
    display: none;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .main-content {
    padding: 1rem;
  }
}

/* Auth Styles */
.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--background);
  padding: 1rem;
}

.auth-card {
  background: var(--card-bg);
  border-radius: 1.5rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  padding: 2.5rem;
  max-width: 450px;
  width: 100%;
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-logo {
  width: 80px;
  height: 80px;
  margin: 0 auto 1rem;
  background: linear-gradient(135deg, var(--primary) 0%, #2563EB 100%);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: 700;
  color: white;
}

.auth-title {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.auth-subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.form-group-password {
  position: relative;
}

.form-input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: 0.75rem;
  font-size: 1rem;
  transition: all 0.3s ease;
  background-color: #F3F4F6;
  font-family: inherit;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--card-bg);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.password-toggle {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 1.2rem;
}

.btn-auth {
  width: 100%;
  padding: 0.875rem;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-top: 1rem;
}

.btn-auth:hover {
  background: var(--primary-dark);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.form-footer {
  text-align: center;
  margin-top: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.form-footer a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

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

/* Sidebar for Dashboard */
.dashboard-sidebar {
  width: 280px;
  background: linear-gradient(135deg, var(--primary) 0%, #2563EB 100%);
  color: white;
  padding: 2rem 1rem;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
}

.sidebar-logo {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dashboard-sidebar-menu {
  list-style: none;
}

.dashboard-sidebar-item {
  margin-bottom: 1rem;
}

.dashboard-sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
}

.dashboard-sidebar-link:hover,
.dashboard-sidebar-link.active {
  background-color: rgba(255, 255, 255, 0.15);
  color: white;
}

.dashboard-main {
  margin-left: 280px;
  flex: 1;
  padding: 2rem;
}

/* Settings Sidebar */
.settings-sidebar {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 1rem;
  height: fit-content;
  box-shadow: var(--shadow);
}

.settings-menu {
  list-style: none;
}

.settings-item {
  margin-bottom: 0.5rem;
}

.settings-link {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 0.5rem;
  transition: all 0.3s ease;
}

.settings-link:hover,
.settings-link.active {
  background-color: var(--background);
  color: var(--primary);
  font-weight: 600;
}

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

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

.text-muted {
  color: var(--text-secondary);
}

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

.hidden {
  display: none;
}