/* src/components/student/StudentLayout.css */

.student-layout {
  display: flex;
  min-height: 100vh;
  background: #f5f7fa;
}

/* Sidebar */
.sidebar {
  width: 280px;
  background: linear-gradient(180deg, #2c3e50 0%, #34495e 100%);
  color: white;
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  height: 100vh;
  z-index: 1000;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
}

.logo-icon {
  font-size: 28px;
}

.sidebar-close {
  display: none;
  background: none;
  border: none;
  color: white;
  font-size: 24px;
  cursor: pointer;
  padding: 4px;
}

/* User Section */
.sidebar-user {
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255,255,255,0.05);
  margin: 16px;
  border-radius: 12px;
}

.user-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  flex-shrink: 0;
}

.user-info {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-weight: 600;
  font-size: 14px;
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.user-role {
  font-size: 12px;
  opacity: 0.7;
}

/* Navigation */
.sidebar-nav {
  flex: 1;
  padding: 8px 16px;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  border-radius: 8px;
  margin-bottom: 4px;
  transition: all 0.2s;
  position: relative;
}

.nav-item:hover {
  background: rgba(255,255,255,0.1);
  color: white;
  transform: translateX(4px);
}

.nav-item.active {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.nav-item.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.nav-icon {
  font-size: 20px;
  width: 24px;
  text-align: center;
}

.nav-label {
  flex: 1;
  font-size: 14px;
  font-weight: 500;
}

.nav-badge {
  background: rgba(255,255,255,0.2);
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.logout-btn {
  width: 100%;
  padding: 12px;
  background: rgba(231, 76, 60, 0.2);
  border: 1px solid rgba(231, 76, 60, 0.3);
  color: white;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.2s;
}

.logout-btn:hover {
  background: #e74c3c;
  border-color: #e74c3c;
  transform: translateY(-2px);
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: 280px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Top Bar */
.top-bar {
  background: white;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  position: sticky;
  top: 0;
  z-index: 100;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: 8px;
  color: #2c3e50;
}

.breadcrumb {
  flex: 1;
}

.breadcrumb-item {
  font-size: 16px;
  font-weight: 600;
  color: #2c3e50;
}

.top-bar-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.notification-btn {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  position: relative;
  padding: 8px;
  border-radius: 50%;
  transition: background 0.2s;
}

.notification-btn:hover {
  background: #f5f7fa;
}

.notification-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  background: #e74c3c;
  color: white;
  font-size: 10px;
  font-weight: 700;
  padding: 2px 5px;
  border-radius: 10px;
  min-width: 16px;
  text-align: center;
}

.user-menu {
  cursor: pointer;
}

.user-avatar-small {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  color: white;
}

/* Page Content */
.page-content {
  flex: 1;
  background: #f5f7fa;
}

/* Sidebar Overlay (Mobile) */
.sidebar-overlay {
  display: none;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-close {
    display: block;
  }

  .sidebar-overlay {
    display: block;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
  }

  .main-content {
    margin-left: 0;
  }

  .menu-toggle {
    display: block;
  }

  .breadcrumb-item {
    font-size: 14px;
  }

  .top-bar {
    padding: 12px 16px;
  }
}

/* Tablet */
@media (max-width: 1024px) and (min-width: 769px) {
  .sidebar {
    width: 240px;
  }

  .main-content {
    margin-left: 240px;
  }

  .logo-text {
    display: none;
  }

  .nav-label {
    font-size: 13px;
  }
}

/* Loading Spinner Component */
.loading-spinner-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #f5f7fa;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid #e0e0e0;
  border-top-color: #667eea;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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