.planner-container {
  max-width: 1400px;
}

#planner-grid {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: flex-start;
}

.grade-column {
  flex: 1;
  background: #374e73;
  padding: 1.5rem;
  border-radius: 8px;
  border: 1px solid #7b96c2;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  display: flex;
  flex-direction: column;
}

.summer-column {
  flex: 0.6;
  padding: 1.5rem 1rem;
  background-color: #25344f;
  border-radius: 8px;
  border: 1px solid #7b96c2;
}

.grade-column h2, .summer-column h2 {
  text-align: center;
  margin-bottom: 1.5rem;
  color: #E1E1E1;
}

.course-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex-grow: 1;
}

.course-card {
  padding: 0.8rem 1rem;
  border: 1px solid #7b96c2;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  position: relative;
  overflow: hidden;
}

.add-course-placeholder {
  padding: 0.8rem 1rem;
  border: 2px dashed #7b96c2;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  text-align: center;
  color: #E1E1E1;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 70px;
}

.add-course-placeholder:hover {
  background-color: #25344f;
  border-color: #E1E1E1;
  color: #E1E1E1;
}

.course-card .name {
  font-weight: 600;
}

.course-card .credits {
  font-size: 0.9em;
  color: #E1E1E1;
  display: block;
}

.course-card.locked {
  background-color: #25344f;
  color: #E1E1E1;
  cursor: not-allowed;
  border-color: #7b96c2;
}

.course-card.available:hover {
  background-color: #374e73;
  border-color: #E1E1E1;
  transform: translateY(-2px);
}

.course-card.planned {
  background-color: #3d6a7f;
  border-color: #5ab2d6;
  font-weight: bold;
  color: #E1E1E1;
}

.course-card.full-year-course {

    min-height: 152px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.course-card.highlight-prereq {
  box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.7);
  border-color: #ffc107;
}

/* --- Program Requirement Visual Feedback Styles --- */
.course-card.required {
  border-left: 5px solid #5cb85c;
}
.course-card.recommended {
  border-left: 5px solid #f0ad4e;
}
.course-card.unnecessary {
  opacity: 0.7;
}
.course-card.required::after, .course-card.recommended::after {
  position: absolute;
  top: 50%;
  right: 5px;
  transform: translateY(-50%);
  font-size: 0.8em;
  font-weight: bold;
  padding: 2px 5px;
  border-radius: 4px;
  color: #25344f;
}
.course-card.required::after {
  content: 'Required';
  background-color: #5cb85c;
}
.course-card.recommended::after {
  content: 'Recommended';
  background-color: #f0ad4e;
}


.delivery-icon {
  position: absolute;
  top: 5px;
  right: 5px;
  font-size: 1.2em;
}

.progress-bar-container {
  width: 100%;
  background-color: #25344f;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.progress-bar {
  height: 20px;
  width: 0%;
  background-color: #7b96c2;
  border-radius: 8px;
  text-align: center;
  color: #25344f;
  line-height: 20px;
  font-weight: bold;
  transition: width 0.3s ease-in-out;
}

#requirements-checklist {
  margin-top: 1rem;
  columns: 2;
  gap: 1rem;
}

.req-item {
  margin-bottom: 0.5rem;
  color: #E1E1E1;
  transition: color 0.3s ease;
}
.req-item.completed {
  color: #E1E1E1;
  font-weight: 500;
}

.planner-controls {
  margin-top: 1.5rem;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.danger-btn {
  background-color: #dc3545;
  color: #E1E1E1;
}
.danger-btn:hover {
  background-color: #c82333;
  color: #E1E1E1;
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal-content {
  background: #25344f;
  padding: 2rem;
  border-radius: 8px;
  border: 1px solid #7b96c2;
  text-align: center;
  max-width: 400px;
}

#course-selection-modal .modal-content {
  max-width: 800px;
  text-align: left;
}

#course-selection-modal input {
  margin-bottom: 1rem;
}

#modal-course-list {
  max-height: 60vh;
  overflow-y: auto;
  display: block;
}

.modal-category {
    margin-bottom: 0.5rem;
    border: 1px solid #7b96c2;
    border-radius: 6px;
    overflow: hidden;
}

.modal-category-toggle {
    width: 100%;
    background-color: #374e73;
    padding: 0.75rem 1rem;
    border: none;
    text-align: left;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    color: #E1E1E1;
    transition: background-color 0.2s ease;
    position: relative;
}

.modal-category-toggle::after {
    content: '▼';
    position: absolute;
    right: 1rem;
    transition: transform 0.2s ease;
    color: #E1E1E1;
}

.modal-category-toggle.active::after {
    transform: rotate(180deg);
}

.modal-category-toggle:hover {
    background-color: #25344f;
}

.modal-category-content {
    padding: 0.5rem 1rem;
    display: none;
    background-color: #374e73;
    border-top: 1px solid #7b96c2;

}

.modal-course-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem;
  border: 1px solid #7b96c2;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.2s ease;
  margin-bottom: 0.5rem;
}
.modal-course-item:last-child {
    margin-bottom: 0;
}

.modal-course-item:hover {
  background-color: #25344f;
  border-color: #E1E1E1;
}

.modal-course-item.locked {
  background-color: #374e73;
  color: #E1E1E1;
  cursor: not-allowed;
}

.modal-course-item .name {
  font-weight: 600;
}

.modal-course-item .prereqs {
  font-size: 0.8em;
  color: #E1E1E1;
  display: block;
}

.visualize-prereq-btn {
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  background-color: #8a63d2;
  color: #E1E1E1;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
}
.visualize-prereq-btn:hover {
    background-color: #724bb8;
    color: #E1E1E1;
}
.modal-course-item.locked .visualize-prereq-btn {
    background-color: #374e73;
}


.modal-content button {
  margin: 0.5rem;
}

.modal-content p {
  margin-bottom: 0.5rem;
}

.grade-footer {
  text-align: right;
  padding-top: 1rem;
  margin-top: 1rem;
  border-top: 2px solid #7b96c2;
  font-size: 1.1em;
}

.grade-footer.warning {
  color: #dc3545;
  font-weight: bold;
}

.tooltip {
  position: absolute;
  background-color: #E1E1E1;
  color: #25344f;
  padding: 0.5rem 0.8rem;
  border-radius: 6px;
  font-size: 0.9em;
  z-index: 1001;
  pointer-events: none;
  white-space: nowrap;
}

/* --- Prerequisite Visualizer Styles --- */
#prereq-visualizer-modal .modal-content {
    max-width: 90vw;
    max-height: 90vh;
    overflow-y: auto;
}
#prereq-tree-container {
    text-align: center;
    padding: 1rem 0;
}
.prereq-node {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    padding: 1rem 0;
}
.prereq-course {
    padding: 0.8rem 1.2rem;
    border-radius: 8px;
    font-weight: bold;
    border: 2px solid;
    min-width: 150px;
}
.prereq-course.target {
    background-color: #3d6a7f;
    border-color: #FFC107;
}
.prereq-course.met {
    background-color: #2e5a5a;
    border-color: #5cb85c;
}
.prereq-course.missing {
    background-color: #4a2c2c;
    border-color: #d9534f;
}

.prereq-children {
    display: flex;
    justify-content: center;
    position: relative;
    padding-top: 2rem;
}
.prereq-children::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 2px;
    height: 2rem;
    background-color: #7b96c2;
}
.prereq-node {
    padding: 0 0.5rem;
}
.prereq-node::before {
    content: '';
    position: absolute;
    top: -2rem;
    left: 50%;
    right: 50%;
    height: 2px;
    background-color: #7b96c2;
}
.prereq-node:first-child::before {
    left: 50%;
}
.prereq-node:last-child::before {
    right: 50%;
}
.prereq-node:only-child::before {
    display: none;
}
.or-group {
    border: 2px dashed #7b96c2;
    padding: 1rem;
    border-radius: 8px;
    margin-top: 2rem;
    position: relative;
}
.or-group::before { /* Connector line for OR group */
    content: '';
    position: absolute;
    top: -2rem;
    left: 50%;
    width: 2px;
    height: 2rem;
    background-color: #7b96c2;
}
.or-group-label {
    position: absolute;
    top: -1em;
    left: 50%;
    transform: translateX(-50%);
    background-color: #25344f;
    padding: 0 0.5rem;
    font-weight: bold;
    color: #FFC107;
}

.prereq-legend {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #7b96c2;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}
.legend-item {
    font-weight: bold;
    position: relative;
    padding-left: 20px;
}
.legend-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    border-radius: 3px;
}
.legend-item.met::before { background-color: #2e5a5a; }
.legend-item.missing::before { background-color: #4a2c2c; }
.legend-item.target::before { background-color: #3d6a7f; }

@media (max-width: 900px) {
  #planner-grid {
    flex-direction: column;
  }

  #requirements-checklist {
    columns: 1;
  }

  .modal-content, #course-selection-modal .modal-content {
    width: 90vw;
    padding: 1.5rem;
  }

  #delivery-modal .modal-content button, #details-modal .modal-content button {
    display: block;
    width: 100%;
    margin-left: 0;
    margin-right: 0;
  }
}

#save-plan {
  background-color: #5cb85c;
  color: #E1E1E1;
}

#save-plan:hover {
  background-color: #4a9d4a;
}

#load-plan {
  background-color: #f0ad4e;
  color: #E1E1E1;
}

#load-plan:hover {
  background-color: #ec971f;
}

#export-pdf {
  background-color: #8a63d2;
  color: #E1E1E1;
}

#export-pdf:hover {
  background-color: #724bb8;
}

/* --- Target Program Module --- */
.target-program-module {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #7b96c2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}
.target-program-module label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}