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

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #4caf50 0%, #45a049 100%);
  min-height: 100vh;
  color: #333;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

/* Header */
.header {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 15px;
  padding: 20px;
  margin-bottom: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.back-btn {
  background: #4caf50;
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 25px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.3s ease;
}

.back-btn:hover {
  background: #45a049;
  transform: translateY(-2px);
}

.page-title {
  font-size: 2rem;
  color: #4caf50;
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  color: #666;
}

.user-info i {
  font-size: 24px;
  color: #4caf50;
}

/* Controls Section */
.controls-section {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 15px;
  padding: 20px;
  margin-bottom: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.filters {
  display: flex;
  gap: 15px;
}

.filter-select {
  padding: 10px 15px;
  border: 2px solid #e0e0e0;
  border-radius: 10px;
  font-size: 14px;
  background: white;
  cursor: pointer;
  transition: all 0.3s ease;
}

.filter-select:focus {
  outline: none;
  border-color: #4caf50;
}

.generate-btn {
  background: #4caf50;
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 25px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.generate-btn:hover {
  background: #45a049;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(76, 175, 80, 0.3);
}

/* Summary Cards */
.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 30px;
}

.summary-card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 15px;
  padding: 25px;
  display: flex;
  align-items: center;
  gap: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.summary-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.card-icon {
  background: linear-gradient(135deg, #4caf50, #45a049);
  color: white;
  width: 60px;
  height: 60px;
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.card-content h3 {
  font-size: 14px;
  color: #666;
  margin-bottom: 8px;
  font-weight: 500;
}

.metric-value {
  font-size: 2rem;
  font-weight: 700;
  color: #333;
  margin-bottom: 5px;
}

.metric-trend {
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.metric-trend.positive {
  color: #4caf50;
}

.metric-trend.negative {
  color: #f44336;
}

/* Charts Section */
.charts-section {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 30px;
  margin-bottom: 30px;
}

.chart-container {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 15px;
  padding: 25px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.chart-container h3 {
  color: #333;
  margin-bottom: 20px;
  font-size: 1.2rem;
}

.chart-placeholder {
  height: 300px;
  background: #f5f5f5;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

#gradesCanvas {
  width: 100%;
  height: 100%;
}

/* Subject Performance */
.subject-performance {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.performance-item {
  display: flex;
  align-items: center;
  gap: 15px;
}

.subject-name {
  min-width: 100px;
  font-weight: 500;
  color: #333;
}

.progress-bar {
  flex: 1;
  height: 8px;
  background: #e0e0e0;
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #4caf50, #45a049);
  border-radius: 4px;
  transition: width 0.3s ease;
}

.score {
  min-width: 40px;
  text-align: right;
  font-weight: 600;
  color: #4caf50;
}

/* Detailed Reports */
.detailed-reports {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 15px;
  padding: 25px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.detailed-reports h3 {
  color: #333;
  margin-bottom: 20px;
  font-size: 1.3rem;
}

.reports-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.report-card {
  background: white;
  border: 2px solid #e0e0e0;
  border-radius: 12px;
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 15px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.report-card:hover {
  border-color: #4caf50;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(76, 175, 80, 0.2);
}

.report-icon {
  background: #f0f8f0;
  color: #4caf50;
  width: 50px;
  height: 50px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.report-info {
  flex: 1;
}

.report-info h4 {
  color: #333;
  margin-bottom: 5px;
  font-size: 1.1rem;
}

.report-info p {
  color: #666;
  font-size: 14px;
  margin-bottom: 5px;
}

.report-date {
  color: #999;
  font-size: 12px;
}

.report-card > i {
  color: #ccc;
  font-size: 16px;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
}

.modal-content {
  background-color: white;
  margin: 5% auto;
  padding: 0;
  border-radius: 15px;
  width: 80%;
  max-width: 800px;
  max-height: 80vh;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.modal-header {
  background: #4caf50;
  color: white;
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  margin: 0;
  font-size: 1.3rem;
}

.close {
  color: white;
  font-size: 28px;
  font-weight: bold;
  cursor: pointer;
  line-height: 1;
}

.close:hover {
  opacity: 0.7;
}

.modal-body {
  padding: 30px;
  max-height: 400px;
  overflow-y: auto;
}

.modal-footer {
  padding: 20px;
  border-top: 1px solid #e0e0e0;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.btn-primary,
.btn-secondary {
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: #4caf50;
  color: white;
}

.btn-primary:hover {
  background: #45a049;
}

.btn-secondary {
  background: #f5f5f5;
  color: #666;
}

.btn-secondary:hover {
  background: #e0e0e0;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 15px;
  }

  .header-content {
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }

  .page-title {
    font-size: 1.5rem;
  }

  .controls-section {
    flex-direction: column;
    gap: 15px;
  }

  .filters {
    flex-direction: column;
    width: 100%;
  }

  .filter-select {
    width: 100%;
  }

  .charts-section {
    grid-template-columns: 1fr;
  }

  .summary-cards {
    grid-template-columns: 1fr;
  }

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

  .modal-content {
    width: 95%;
    margin: 10% auto;
  }
}

@media (max-width: 480px) {
  .summary-card {
    flex-direction: column;
    text-align: center;
  }

  .performance-item {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .subject-name {
    min-width: auto;
    text-align: center;
  }

  .score {
    text-align: center;
  }
}