.submissions-page {
  min-height: calc(100vh - 80px);
  padding: 2rem;
  background: #f8fafc;
}

.submissions-container {
  max-width: 800px;
  margin: 0 auto;
  background: white;
  padding: 2rem;
  border-radius: 20px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.submissions-container h2 {
  font-size: 2rem;
  color: #1a1a1a;
  margin-bottom: 2rem;
  text-align: center;
}

.upload-section {
  margin-bottom: 2rem;
}

.upload-box {
  border: 2px dashed #e2e8f0;
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  background: #f8fafc;
  transition: all 0.3s ease;
}

.upload-box:hover {
  border-color: #3b82f6;
  background: #f0f7ff;
}

.file-input {
  display: none;
}

.upload-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  cursor: pointer;
}

.upload-label i {
  font-size: 2.5rem;
  color: #3b82f6;
}

.upload-label span {
  color: #64748b;
  font-size: 1.1rem;
}

.upload-hint {
  font-size: 0.9rem !important;
  color: #94a3b8 !important;
}

.submissions-list {
  display: grid;
  gap: 1rem;
  margin-top: 2rem;
}

.submission-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  transition: all 0.2s ease;
}

.submission-item:hover {
  border-color: #cbd5e1;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.submission-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-grow: 1;
}

.file-icon {
  font-size: 1.5rem;
  color: #3b82f6;
}

.submission-details {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.file-name {
  font-size: 1rem;
  color: #1e293b;
}

.pennid-input {
  padding: 0.5rem 1rem;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  font-size: 0.95rem;
  width: 150px;
  transition: all 0.2s ease;
}

.pennid-input:focus {
  border-color: #3b82f6;
  outline: none;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.remove-btn {
  background: none;
  border: none;
  color: #ef4444;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: all 0.2s ease;
}

.remove-btn:hover {
  background: #fef2f2;
}

.grading-controls {
  margin-top: 2rem;
  text-align: center;
}

.grade-btn {
  background: #3b82f6;
  color: white;
  border: none;
  padding: 1rem 2.5rem;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  transition: all 0.2s ease;
}

.grade-btn:hover:not(:disabled) {
  background: #2563eb;
  transform: translateY(-1px);
}

.grade-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.warning-text {
  color: #dc2626;
  font-size: 0.9rem;
  margin-top: 1rem;
}