.major-selector {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin: 20px 0;
  padding: 0 20px;
  flex-wrap: wrap;
}

.major-btn {
  padding: 8px 15px;
  border-radius: 8px;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}

.major-btn:hover:not(:disabled) {
  border-color: var(--primary-color);
  transform: translateY(-2px);
}

.major-btn.active {
  background: linear-gradient(
    90deg,
    var(--primary-color) 0%,
    var(--primary-gradient) 100%
  );
  /* border-color: transparent; */
  border: 1px solid #fff;
  color: #fff;
}

.major-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin: 20px;
  flex-wrap: wrap;
}

.control-btn {
  padding: 10px 20px;
  border-radius: 8px;
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.control-btn:hover {
  border-color: var(--primary-color);
  background: var(--primary-color);
  color: #fff;
}

.info-text {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 6px;
}

.semester-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  padding: 20px;
  margin: 0 auto;
  max-width: 1400px;
}

.semester-box {
  background: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  min-height: 200px;
  min-width: 280px;
}

.semester-title {
  color: var(--text-color);
  font-size: 1.1rem;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.course-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 100px;
}

.course-item {
  background: rgba(109, 40, 217, 0.1);
  border: 1px solid rgba(109, 40, 217, 0.2);
  border-radius: 8px;
  padding: 16px;
  cursor: move;
  transition: all 0.2s;
  user-select: none;
}

.course-item:hover {
  background: rgba(109, 40, 217, 0.2);
  transform: translateY(-2px);
}

.course-item.dragging {
  opacity: 0.5;
  background: rgba(109, 40, 217, 0.3);
}

.course-item.selected {
  background: rgba(79, 70, 229, 0.2);
  border-color: rgba(79, 70, 229, 0.4);
  box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.3);
}

.course-item.prerequisite {
  background: rgba(245, 158, 11, 0.1);
  border-color: rgba(245, 158, 11, 0.3);
}

.course-item.prerequisite-missing {
  background: rgba(239, 68, 68, 0.1);
  border-color: rgba(239, 68, 68, 0.3);
}

.course-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
}

.course-code {
  font-weight: 600;
  color: var(--text-color);
  font-size: 1rem;
}

.course-credits {
  background: rgba(109, 40, 217, 0.1);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--primary-color);
}

.course-name {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 8px 0;
  line-height: 1.4;
}

.course-prereqs {
  font-size: 0.85rem;
  color: #f59e0b;
  display: flex;
  align-items: center;
  gap: 4px;
}

.course-prereqs i {
  font-size: 0.8rem;
}

.legend {
  display: flex;
  gap: 16px;
  margin-top: 8px;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.color-box {
  width: 16px;
  height: 16px;
  border-radius: 4px;
}

.color-box.prerequisite {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.color-box.selected {
  background: rgba(79, 70, 229, 0.2);
  border: 1px solid rgba(79, 70, 229, 0.4);
}

.semester-credits {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-left: 8px;
}

@media (max-width: 768px) {
  .semester-grid {
    grid-template-columns: 1fr;
    padding: 10px;
  }

  .controls {
    flex-direction: column;
    align-items: stretch;
    padding: 0 20px;
  }

  .info-text {
    text-align: center;
    justify-content: center;
  }
}