:root {
  --primary: #4361ee;
  --primary-dark: #3a0ca3;
  --primary-light: #e0e7ff;
  --secondary: #4895ef;
  --secondary-dark: #3f37c9;
  --accent: #f72585;
  --accent-dark: #b5179e;
  --light: #f8f9fa;
  --dark: #212529;
  --gray: #6c757d;
  --gray-light: #e9ecef;
  --success: #4cc9f0;
  --success-dark: #3a86ff;
  --warning: #f8961e;
  --warning-dark: #f3722c;
  --danger: #ef233c;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.15);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
}

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

body {
  font-family: 'Tajawal', sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
  margin: 0;
  padding: 20px;
  min-height: 100vh;
  color: var(--dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* تحسينات الأزرار */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border: none;
  border-radius: var(--border-radius);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  font-weight: 700;
  font-size: 16px;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow);
  overflow: hidden;
  z-index: 1;
  transform: translateY(0);
  margin: 8px;
  text-decoration: none;
  min-width: 120px;
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  color: white;
}

.btn:active {
  transform: translateY(1px);
  box-shadow: 0 2px 10px rgba(67, 97, 238, 0.3);
}

.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px var(--primary-light);
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  z-index: -1;
  opacity: 0;
  transition: var(--transition);
}

.btn:hover::before {
  opacity: 1;
}

/* تأثير النقر (Ripple Effect) */
.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 5px;
  height: 5px;
  background: rgba(255, 255, 255, 0.5);
  opacity: 0;
  border-radius: 100%;
  transform: scale(1, 1) translate(-50%, -50%);
  transform-origin: 50% 50%;
}

.btn:focus:not(:active)::after {
  animation: ripple 0.6s ease-out;
}

@keyframes ripple {
  0% {
    transform: scale(0, 0);
    opacity: 0.5;
  }
  100% {
    transform: scale(20, 20);
    opacity: 0;
  }
}

/* أنواع الأزرار المحسنة */
.btn.logout-btn {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  box-shadow: 0 4px 15px rgba(247, 37, 133, 0.3);
}

.btn.logout-btn::before {
  background: linear-gradient(135deg, var(--accent-dark) 0%, #7209b7 100%);
}

.btn.add-btn {
  background: linear-gradient(135deg, var(--success) 0%, var(--secondary) 100%);
  box-shadow: 0 4px 15px rgba(76, 201, 240, 0.3);
}

.btn.add-btn::before {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
}

.btn.back-btn {
  background: linear-gradient(135deg, var(--warning) 0%, var(--warning-dark) 100%);
  box-shadow: 0 4px 15px rgba(248, 150, 30, 0.3);
}

.btn.back-btn::before {
  background: linear-gradient(135deg, var(--warning-dark) 0%, var(--warning) 100%);
}

.btn.cancel-btn {
  background: linear-gradient(135deg, var(--gray) 0%, #495057 100%);
  box-shadow: 0 4px 15px rgba(108, 117, 125, 0.3);
}

.btn.cancel-btn::before {
  background: linear-gradient(135deg, #495057 0%, #343a40 100%);
}

.btn.danger-btn {
  background: linear-gradient(135deg, var(--danger) 0%, #d00000 100%);
  box-shadow: 0 4px 15px rgba(239, 35, 60, 0.3);
}

.btn.danger-btn::before {
  background: linear-gradient(135deg, #d00000 0%, #9d0208 100%);
}

/* أزرار الأيقونات المحسنة */
.btn-icon {
  background: none;
  border: none;
  color: var(--gray);
  cursor: pointer;
  transition: var(--transition);
  padding: 10px;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  background-color: rgba(0, 0, 0, 0.03);
}

.btn-icon:hover {
  background-color: rgba(0, 0, 0, 0.08);
  color: var(--accent);
  transform: rotate(15deg) scale(1.1);
}

.btn-icon:active {
  transform: rotate(15deg) scale(0.95);
}

.btn-icon.delete-btn:hover {
  color: var(--danger);
  background: rgba(239, 35, 60, 0.1);
}

.btn-icon i {
  font-size: 18px;
}

/* تحسينات العناصر العامة */
.dashboard-container, .login-container {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 30px;
  margin: 20px auto;
  max-width: 800px;
  animation: fadeInUp 0.4s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.sections-list, .students-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.section-item, .student-card {
  background: white;
  border-radius: var(--border-radius);
  padding: 20px;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
  border-left: 4px solid var(--primary);
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

.section-item:hover, .student-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  flex-wrap: wrap;
  gap: 15px;
}

.section-footer {
  display: flex;
  justify-content: space-between;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid var(--gray-light);
  flex-wrap: wrap;
  gap: 15px;
}

.student-info h4 {
  margin: 0 0 8px 0;
  color: var(--dark);
  font-size: 18px;
  font-weight: 700;
}

.student-info p {
  margin: 6px 0;
  color: var(--gray);
  font-size: 14px;
  display: flex;
  align-items: center;
}

.student-info i {
  margin-left: 8px;
  font-size: 14px;
}

/* تحسينات النوافذ المنبثقة */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

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

.modal-content {
  background: white;
  border-radius: var(--border-radius);
  padding: 30px;
  width: 90%;
  max-width: 500px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  position: relative;
  transform: translateY(20px) scale(0.98);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.close {
  position: absolute;
  top: 15px;
  left: 15px;
  font-size: 24px;
  cursor: pointer;
  color: var(--gray);
  transition: var(--transition-fast);
  background: none;
  border: none;
  padding: 5px;
}

.close:hover {
  color: var(--accent);
  transform: rotate(90deg);
}

/* تحسينات الحالة الفارغة */
.empty-state {
  text-align: center;
  padding: 40px;
  color: var(--gray);
  grid-column: 1 / -1;
}

.empty-state i {
  font-size: 48px;
  margin-bottom: 15px;
  color: var(--gray-light);
}

.empty-state p {
  font-size: 18px;
  margin-top: 15px;
  color: var(--gray);
}

/* تحسينات حقول الإدخال */
.input-group {
  margin-bottom: 20px;
}

.input-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
  color: var(--dark);
}

.input-group input, .input-group select, .input-group textarea {
  width: 100%;
  padding: 12px 15px;
  border: 1px solid #ddd;
  border-radius: var(--border-radius-sm);
  font-family: 'Tajawal', sans-serif;
  transition: var(--transition-fast);
  background-color: white;
}

.input-group input:focus, .input-group select:focus, .input-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
  outline: none;
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 15px;
  margin-top: 30px;
}

/* تحسينات نظام المهام */
.student-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.warning-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--warning);
  color: white;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  font-size: 12px;
  font-weight: bold;
  margin-right: 8px;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

.tasks-container {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 1px dashed var(--gray-light);
}

.tasks-container h5 {
  margin-bottom: 10px;
  color: var(--primary);
  font-size: 16px;
  display: flex;
  align-items: center;
}

.tasks-container h5 i {
  margin-left: 8px;
}

.task-item {
  background: var(--light);
  border-radius: var(--border-radius-sm);
  padding: 12px;
  margin-bottom: 10px;
  transition: var(--transition-fast);
  border-left: 3px solid var(--primary-light);
}

.task-item:hover {
  background: white;
  box-shadow: var(--shadow);
}

.task-item strong {
  color: var(--primary-dark);
  display: block;
  margin-bottom: 5px;
  font-size: 14px;
}

.task-item p {
  margin: 5px 0;
  color: var(--gray);
  font-size: 13px;
  display: flex;
  align-items: center;
}

.task-item i {
  margin-left: 8px;
  color: var(--primary);
  font-size: 13px;
}

.task-item .task-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 8px;
  font-size: 12px;
  color: var(--gray);
}

/* تحسينات للهواتف */
@media (max-width: 768px) {
  body {
    padding: 15px;
  }
  
  .sections-list, .students-list {
    grid-template-columns: 1fr;
  }
  
  .section-header, .section-footer, .form-actions {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
    margin: 8px 0;
  }
  
  .modal-content {
    padding: 25px 15px;
    width: 95%;
  }
  
  .dashboard-container, .login-container {
    padding: 20px;
  }
}

/* تحسينات إضافية */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s ease-in-out infinite;
  margin-right: 8px;
}

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

.btn.loading .loading-spinner {
  display: inline-block;
}

.btn.loading span {
  display: none;
}

.tooltip {
  position: relative;
}

.tooltip:hover::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--dark);
  color: white;
  padding: 5px 10px;
  border-radius: var(--border-radius-sm);
  font-size: 12px;
  white-space: nowrap;
  margin-bottom: 8px;
  z-index: 10;
}

.tooltip:hover::before {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border-width: 5px;
  border-style: solid;
  border-color: var(--dark) transparent transparent transparent;
  margin-bottom: 3px;
}
.tasks-container {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px dashed var(--gray-light);
}

.tasks-container h5 {
    margin-bottom: 10px;
    color: var(--primary);
    font-size: 16px;
    display: flex;
    align-items: center;
}

.tasks-container h5 i {
    margin-left: 8px;
}

.task-item {
    background: var(--light);
    border-radius: var(--border-radius-sm);
    padding: 12px;
    margin-bottom: 10px;
    transition: var(--transition-fast);
    border-left: 3px solid var(--primary-light);
}

.task-item:hover {
    background: white;
    box-shadow: var(--shadow);
}

.task-item strong {
    color: var(--primary-dark);
    display: block;
    margin-bottom: 5px;
    font-size: 14px;
}

.task-item p {
    margin: 5px 0;
    color: var(--gray);
    font-size: 13px;
    display: flex;
    align-items: center;
}

.task-item i {
    margin-left: 8px;
    color: var(--primary);
    font-size: 13px;
}