/* ==========================================================================
   UI Components Styles (Header, Navbar, Modals, Forms, Buttons, Cards)
   ========================================================================== */

/* Navbar & Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.avatar-wrapper {
  position: relative;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary), var(--accent-purple));
  padding: 2px;
  box-shadow: var(--shadow-md);
}

.avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-full);
  background: var(--bg-card);
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.system-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}

.school-name {
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: 500;
}

.teacher-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* User Info Badge */
.user-badge {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.8rem;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.55rem 1.1rem;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: #ffffff;
  box-shadow: 0 4px 12px var(--primary-glow);
}

.btn-primary:hover {
  opacity: 0.95;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px var(--primary-glow);
}

.btn-secondary {
  background: var(--bg-card);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--border-color);
  color: var(--text-primary);
}

.btn-danger {
  background-color: var(--danger);
  color: #ffffff;
}

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

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

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

.btn-icon {
  width: 38px;
  height: 38px;
  padding: 0;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-icon:hover {
  background: var(--border-color);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  position: relative;
  overflow: hidden;
  color: var(--text-primary);
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

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

.modal-container {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-color);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  transform: translateY(20px) scale(0.95);
  transition: transform var(--transition-normal);
  overflow: hidden;
}

.modal-overlay.active .modal-container {
  transform: translateY(0) scale(1);
}

.modal-lg {
  max-width: 850px;
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.modal-close:hover {
  color: var(--text-primary);
  background: var(--border-color);
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.75rem;
  background: var(--bg-primary);
}

/* Forms */
.form-group {
  margin-bottom: 1.2rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.form-control {
  width: 100%;
  padding: 0.65rem 0.9rem;
  font-size: 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

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

/* Dropzone */
.file-dropzone {
  border: 2px dashed var(--border-hover);
  border-radius: var(--radius-md);
  padding: 1.75rem 1rem;
  text-align: center;
  cursor: pointer;
  background: var(--bg-primary);
  transition: all var(--transition-fast);
}

.file-dropzone:hover, .file-dropzone.dragover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.dropzone-icon {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  min-width: 280px;
  max-width: 380px;
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  animation: slideInRight 0.3s ease forwards;
}

.toast-success { border-left: 4px solid var(--success); }
.toast-error { border-left: 4px solid var(--danger); }
.toast-warning { border-left: 4px solid var(--warning); }
.toast-info { border-left: 4px solid var(--secondary); }

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

/* Content Container */
.main-content {
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
}