/* GitHub-inspired Variables for consistent styling */
:root {
  /* Color Palette - GitHub Light Theme */
  --color-scale-gray-0: #ffffff;
  --color-scale-gray-1: #f6f8fa;
  --color-scale-gray-2: #eaeef2;
  --color-scale-gray-3: #d0d7de;
  --color-scale-gray-4: #afb8c1;
  --color-scale-gray-5: #8c959f;
  --color-scale-gray-6: #6e7781;
  --color-scale-gray-7: #424a53;
  --color-scale-gray-8: #32383f;
  --color-scale-gray-9: #24292f;
  
  /* GitHub Brand Colors */
  --color-scale-blue-0: #ddf4ff;
  --color-scale-blue-1: #b6e3ff;
  --color-scale-blue-2: #80ccff;
  --color-scale-blue-3: #54aeff;
  --color-scale-blue-4: #218bff;
  --color-scale-blue-5: #0969da;
  --color-scale-blue-6: #0550ae;
  --color-scale-blue-7: #033d8b;
  --color-scale-blue-8: #0a2c66;
  --color-scale-blue-9: #061d45;

  /* GitHub Semantic Colors */
  --color-fg-default: var(--color-scale-gray-9);
  --color-fg-muted: var(--color-scale-gray-6);
  --color-fg-subtle: var(--color-scale-gray-5);
  --color-fg-accent: var(--color-scale-blue-5);
  
  --color-bg-default: var(--color-scale-gray-0);
  --color-bg-subtle: var(--color-scale-gray-1);
  --color-bg-muted: var(--color-scale-gray-2);
  --color-bg-accent: var(--color-scale-blue-1);
  
  --color-border-default: var(--color-scale-gray-3);
  --color-border-muted: var(--color-scale-gray-2);
  --color-border-subtle: rgba(27, 31, 36, 0.05);
  --color-border-accent: var(--color-scale-blue-4);

  /* Success, Warning, Error Colors */
  --color-success-fg: #1a7f37;
  --color-success-bg: #dafbe1;
  --color-success-border: rgba(74, 194, 107, 0.4);
  
  --color-attention-fg: #9a6700;
  --color-attention-bg: #fff8c5;
  --color-attention-border: rgba(212, 167, 44, 0.4);
  
  --color-danger-fg: #cf222e;
  --color-danger-bg: #ffebe9;
  --color-danger-border: rgba(255, 129, 130, 0.4);

  /* Typography - GitHub style */
  --base-font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --base-text-size: 14px;
  --text-xs: 11px;
  --text-sm: 12px;
  --text-md: 14px;
  --text-lg: 16px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 32px;
  
  /* Spacing - GitHub compact style */
  --spacing-1: 4px;
  --spacing-2: 8px;
  --spacing-3: 12px;
  --spacing-4: 16px;
  --spacing-5: 20px;
  --spacing-6: 24px;
  --spacing-7: 32px;
  --spacing-8: 40px;
  
  /* Other */
  --border-radius-sm: 3px;
  --border-radius: 6px;
  --border-radius-lg: 12px;
  --box-shadow-sm: 0 1px 2px rgba(31, 35, 40, 0.075);
  --box-shadow: 0 3px 6px rgba(140, 149, 159, 0.15);
  --box-shadow-lg: 0 8px 24px rgba(140, 149, 159, 0.2);
  --box-shadow-xl: 0 12px 48px rgba(140, 149, 159, 0.3);
  --transition: all 0.2s ease;
}

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

body {
  font-family: var(--base-font-family);
  font-size: var(--text-md);
  line-height: 1.5;
  color: var(--color-fg-default);
  background-color: var(--color-bg-subtle);
  overflow-x: hidden; /* Prevent horizontal scrolling */
}

h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--spacing-4);
  font-weight: 600;
  color: var(--color-fg-default);
  line-height: 1.25;
}

/* GitHub-style buttons */
button {
  cursor: pointer;
  padding: var(--spacing-2) var(--spacing-3);
  border: 1px solid var(--color-border-default);
  border-radius: var(--border-radius);
  background-color: var(--color-bg-default);
  color: var(--color-fg-default);
  font-weight: 500;
  transition: var(--transition);
  font-size: var(--text-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--box-shadow-sm);
}

button:hover {
  background-color: var(--color-bg-subtle);
  border-color: var(--color-scale-gray-4);
}

button:active {
  background-color: var(--color-bg-muted);
  border-color: var(--color-scale-gray-5);
}

button:disabled {
  background-color: var(--color-bg-subtle);
  color: var(--color-fg-muted);
  cursor: not-allowed;
  border-color: var(--color-border-muted);
  box-shadow: none;
}

/* Primary button - blue like GitHub */
button.btn-primary {
  background-color: var(--color-scale-blue-5);
  color: white;
  border-color: var(--color-scale-blue-5);
}

button.btn-primary:hover {
  background-color: var(--color-scale-blue-6);
  border-color: var(--color-scale-blue-6);
}

button.btn-danger {
  background-color: var(--color-danger-fg);
  color: white;
  border-color: var(--color-danger-fg);
}

button.btn-danger:hover {
  background-color: #b5202a;
  border-color: #b5202a;
}

/* Outlined danger button - red border with white background */
button.btn-danger-outline {
  background-color: var(--color-bg-default);
  color: var(--color-danger-fg);
  border-color: var(--color-danger-fg);
  border-width: 1px;
}

button.btn-danger-outline:hover {
  background-color: var(--color-danger-bg);
  border-color: var(--color-danger-fg);
}

/* GitHub-style form controls */
input, select, textarea {
  padding: var(--spacing-2) var(--spacing-3);
  border: 1px solid var(--color-border-default);
  border-radius: var(--border-radius);
  transition: var(--transition);
  font-size: var(--text-md);
  color: var(--color-fg-default);
  background-color: var(--color-bg-default);
  width: 100%;
  line-height: 20px;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-scale-blue-5);
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.3);
}

input::placeholder {
  color: var(--color-fg-subtle);
}

/* GitHub-style select */
select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 16 16' fill='none'%3E%3Cpath d='M4.5 6.5L8 10L11.5 6.5' stroke='%238c959f' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-3) center;
  padding-right: var(--spacing-7);
}

/* GitHub-style layout */
header {
  background-color: var(--color-bg-default);
  border-bottom: 1px solid var(--color-border-default);
  padding: var(--spacing-4) var(--spacing-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 1px 2px rgba(27, 31, 36, 0.075);
}

header h1 {
  margin-bottom: 0;
  font-size: var(--text-xl);
  font-weight: 600;
}

main {
  padding: var(--spacing-6);
  max-width: 1440px;
  margin: 0 auto;
  overflow-x: hidden; /* Prevent horizontal scrolling */
}

#content-container {
  display: grid;
  grid-template-columns: 3fr 1.5fr;
  grid-template-rows: auto auto;
  grid-template-areas: 
    "planner catalog"
    "planner requirements";
  gap: var(--spacing-4);
  max-width: 100%;
}

/* Shared Card Style */
.card {
  background-color: var(--color-bg-default);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow-sm);
  border: 1px solid var(--color-border-default);
  padding: var(--spacing-3);
}

/* Refactor .course-card and .requirement-group to use .card */
.course-card {
  /* Inherit .card styles */
  margin-bottom: var(--spacing-2);
  cursor: grab;
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  width: 100%; /* Ensure consistent width */
  min-width: 0; /* Allow truncation of long content */
}

.requirement-group {
  /* Inherit .card styles */
  margin-bottom: var(--spacing-4);
  overflow: hidden;
}

#semester-planner,
#course-catalog,
#requirements {
  /* Removed redundant properties from here */
  background-color: var(--color-bg-default);
  border-radius: var(--border-radius);
  padding: var(--spacing-4);
  box-shadow: var(--box-shadow-sm);
  border: 1px solid var(--color-border-default);
}

#semester-planner {
  grid-area: planner;
}

#course-catalog {
  grid-area: catalog;
}

#requirements {
  grid-area: requirements;
}

#semester-planner h2,
#course-catalog h2,
#requirements h2 {
  font-size: var(--text-lg);
  padding-bottom: var(--spacing-2);
  margin-bottom: var(--spacing-4);
  border-bottom: 1px solid var(--color-border-default);
  color: var(--color-fg-default);
}

/* Plan Controls - GitHub-style button bar */
#plan-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  flex-wrap: wrap;
}

#plan-selector {
  min-width: 200px;
  height: 32px; /* Match GitHub height */
  padding: var(--spacing-1) var(--spacing-3);
  font-size: var(--text-md);
}

#plan-controls button {
  padding: var(--spacing-1) var(--spacing-3);
  height: 32px;
}

#new-plan-btn {
  background-color: var(--color-success-fg);
  color: white;
  border-color: var(--color-success-fg);
}

#new-plan-btn:hover {
  background-color: #166c2e;
  border-color: #166c2e;
}

#delete-plan-btn {
  background-color: var(--color-bg-default);
  color: var(--color-danger-fg);
  border-color: var(--color-border-default);
}

#delete-plan-btn:hover {
  color: white;
  background-color: var(--color-danger-fg);
  border-color: var(--color-danger-fg);
}

/* Academic Years and Semesters */
.academic-year {
  margin-bottom: var(--spacing-5);
  border: 1px solid var(--color-border-default);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow-sm);
  padding: 0; /* Override .card padding */
  background-color: var(--color-bg-default);
}

.year-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-3) var(--spacing-4);
  background-color: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border-default);
}

.year-header h3 {
  margin: 0;
  font-size: var(--text-md);
  font-weight: 600;
}

.year-header button {
  padding: var(--spacing-1) var(--spacing-2);
  font-size: var(--text-sm);
  height: 24px;
}

.semesters-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background-color: var(--color-border-default);
  min-width: 0; /* Prevent overflow caused by children */
}

.semester {
  background-color: var(--color-bg-default);
  padding: var(--spacing-3);
  border-radius: 0;
  min-width: 0; /* Allow proper truncation of children */
  width: 100%; /* Ensure consistent width */
  display: flex;
  flex-direction: column;
}

.semester-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-3);
  padding-bottom: var(--spacing-1);
  border-bottom: 1px solid var(--color-border-muted);
  min-width: 0; /* Enable proper text truncation in children */
}

.semester-title {
  margin: 0;
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--color-fg-default);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-right: var(--spacing-2);
}

.credit-total {
  font-size: var(--text-sm);
  color: var(--color-fg-muted);
  font-weight: 500;
  background-color: var(--color-bg-subtle);
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: 100px;
}

.course-container {
  min-height: 120px;
  border: 1px solid var(--color-border-default);
  border-radius: var(--border-radius);
  padding: var(--spacing-2);
  background-color: var(--color-bg-subtle);
  transition: var(--transition);
  overflow: hidden; /* Prevent overflow from long course names */
  width: 100%; /* Ensure consistent width */
  flex: 1; /* Take up remaining space in semester container */
}

.course-container:empty {
  display: flex;
  justify-content: center;
  align-items: center;
}

.course-container:empty::after {
  content: "Drag courses here";
  color: var(--color-fg-muted);
  font-size: var(--text-sm);
  font-style: italic;
}

.course-container:hover {
  background-color: var(--color-bg-muted);
}

/* Course Cards - GitHub card style */
.course-card {
  /* Inherit .card styles */
  margin-bottom: var(--spacing-2);
  cursor: grab;
  transition: var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  width: 100%; /* Ensure consistent width */
  min-width: 0; /* Allow truncation of long content */
}

.course-card:hover {
  box-shadow: var(--box-shadow);
  border-color: var(--color-scale-gray-4);
  z-index: 1;
}

.course-card:active {
  cursor: grabbing;
}

.course-card.has-error {
  border-color: var(--color-danger-fg);
  background-color: var(--color-danger-bg);
}

.course-card.has-error:hover {
  box-shadow: 0 0 0 1px var(--color-danger-fg);
}

.course-code {
  font-weight: 600;
  font-size: var(--text-md);
  color: var(--color-fg-default);
}

.course-name {
  font-size: var(--text-sm);
  color: var(--color-fg-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
  max-width: 100%;
}

/* Course list in catalog */
#course-search {
  margin-bottom: var(--spacing-3);
}

#course-search-input {
  width: 100%;
  padding: var(--spacing-2) var(--spacing-3) var(--spacing-2) calc(var(--spacing-6) + var(--spacing-2));
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' width='16' height='16'%3E%3Cpath fill='%236e7781' d='M10.68 11.74a6 6 0 0 1-7.922-8.982 6 6 0 0 1 8.982 7.922l3.04 3.04a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215ZM11.5 7a4.499 4.499 0 1 0-8.997 0A4.499 4.499 0 0 0 11.5 7Z'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: var(--spacing-3) center;
  background-size: 16px;
  border: 1px solid var(--color-border-default);
  border-radius: var(--border-radius);
}

#course-list {
  margin-top: var(--spacing-3);
  max-height: 300px;
  overflow-y: auto;
  border: 1px solid var(--color-border-default);
  border-radius: var(--border-radius);
  padding: var(--spacing-2);
  background-color: var(--color-bg-subtle);
}

#course-list .course-card {
  margin-bottom: var(--spacing-2);
}

/* Shared Add Button Style */
.btn-add-dashed {
  margin-top: var(--spacing-3);
  width: 100%;
  padding: var(--spacing-2) var(--spacing-3);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-2);
  font-weight: 500;
  background-color: var(--color-bg-default);
  color: var(--color-fg-default);
  border: 1px dashed var(--color-border-default);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
}

.btn-add-dashed:hover {
  background-color: var(--color-bg-subtle);
  border-color: var(--color-scale-gray-4);
}

.btn-add-dashed::before {
  content: "+";
  font-size: var(--text-lg);
  line-height: 1;
  font-weight: 600;
}

.warnings-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.warning-item {
  color: var(--color-danger-fg);
  font-size: var(--text-sm);
  line-height: 1.4;
  padding: var(--spacing-1) 0;
}

.warnings-row {
  background-color: var(--color-danger-bg);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-1) var(--spacing-2);
  margin-top: var(--spacing-1);
}

.requirement-card {
  margin-bottom: var(--spacing-4);
  padding: 0; /* Override .card padding */
  overflow: hidden; /* Ensure content doesn't overflow the border radius */
}

.requirement-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-3) var(--spacing-4);
  background-color: var(--color-bg-subtle);
  border-bottom: 1px solid var(--color-border-default);
}

.requirement-title {
  margin: 0;
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--color-fg-default);
}

.requirement-segments-container {
  padding: var(--spacing-3);
  background-color: var(--color-bg-subtle);
  min-height: 60px;
}

.requirement-tree {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1); /* Reduced from var(--spacing-2) */
  padding: 0;
}

.requirement-segment {
  display: flex;
  align-items: flex-start;
  background-color: var(--color-bg-default);
  border: 1px solid var(--color-border-default);
  border-radius: var(--border-radius);
  padding: var(--spacing-2) var(--spacing-3);
  transition: var(--transition);
  gap: var(--spacing-2);
  cursor: pointer; /* Indicate clickability */
  position: relative;
}

.requirement-segment:last-child {
  margin-bottom: 0; /* Remove margin from last segment */
}

.requirement-segment:hover {
  background-color: var(--color-bg-subtle);
  border-color: var(--color-scale-gray-4);
  box-shadow: var(--box-shadow-sm);
}

.requirement-children {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  margin-left: var(--spacing-5);
  padding-left: var(--spacing-3);
  border-left: 1px dashed var(--color-border-muted);
  margin-top: var(--spacing-1);
  margin-bottom: var(--spacing-1);
}

/* Different node type visual cues */
.requirement-segment[class*="depth-0"] {
  margin-bottom: var(--spacing-2); /* Consistent spacing */
}

/* Status colors */
.status-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-weight: bold;
  font-size: 14px;
}

.status-icon.complete {
  color: var(--color-success-fg);
  background-color: var(--color-success-bg);
  border: 1px solid var(--color-success-border);
}

.status-icon.incomplete {
  color: var(--color-danger-fg);
  background-color: var(--color-danger-bg);
  border: 1px solid var(--color-danger-border);
}

/* Status badge styling */
.status-badge {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: 100px;
  text-transform: uppercase;
  display: inline-block;
}

.status-badge.complete {
  color: var(--color-success-fg);
  background-color: var(--color-success-bg);
  border: 1px solid var(--color-success-border);
}

.status-badge.incomplete {
  color: var(--color-danger-fg);
  background-color: var(--color-danger-bg);
  border: 1px solid var(--color-danger-border);
}

.requirement-text {
  flex-grow: 1;
}

.requirement-operator {
  font-weight: 600;
  color: var(--color-fg-muted);
  display: block;
}

.requirement-text {
  font-weight: 500;
  color: var(--color-fg-default);
}

.requirement-children {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
  margin-left: var(--spacing-4);
  padding-left: var(--spacing-3);
  border-left: 2px dashed var(--color-border-muted);
  margin-top: var(--spacing-1);
  margin-bottom: var(--spacing-2);
}

/* Modal Overlay Styles */
.modal {
  display: none; /* Hidden by default */
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100vw;
  height: 100vh;
  overflow: auto;
  background: rgba(0, 0, 0, 0.5); /* Darkened background */
  justify-content: center;
  align-items: center;
  transition: opacity 0.2s;
}

.modal[style*="display: block"] {
  display: flex !important;
}

.modal-content {
  background: var(--color-bg-default);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow-xl);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.modal .close {
  position: absolute;
  top: var(--spacing-4);
  right: var(--spacing-4);
  width: 20px;
  height: 20px;
  font-size: var(--text-xl);
  color: var(--color-fg-muted);
  background: none;
  border: none;
  cursor: pointer;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  line-height: 1;
  box-shadow: none;
}

.modal .close:hover {
  color: var(--color-fg-default);
}

.modal-content .modal-header {
  padding: var(--spacing-4);
  border-bottom: 1px solid var(--color-border-default);
  margin-bottom: 0;
}

.modal-content .modal-header h2 {
  margin: 0;
  font-size: var(--text-xl);
  color: var(--color-fg-default);
  line-height: 1.2;
}

.modal-content .modal-body {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: var(--spacing-4);
  padding-bottom: calc(var(--spacing-8) + var(--spacing-4));
}

.modal-content .modal-body label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-2);
  color: var(--color-fg-default);
}

.modal-content .modal-body .form-group {
  margin-bottom: var(--spacing-4);
}

.modal-content .modal-body input,
.modal-content .modal-body select,
.modal-content .modal-body textarea {
  margin-bottom: var(--spacing-2);
}

.modal-content .modal-body .helper-text {
  font-size: var(--text-sm);
  color: var(--color-fg-muted);
  margin-top: var(--spacing-1);
}

.modal-content .modal-actions {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-bg-default);
  border-top: 1px solid var(--color-border-default);
  padding: var(--spacing-3) var(--spacing-4);
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-2);
  z-index: 1;
}

@media (max-width: 600px) {
  .modal-content {
    max-width: 100vw;
    width: 100vw;
    height: 100vh;
    max-height: 100vh;
    border-radius: 0;
    box-shadow: none;
  }
  
  .modal-content .modal-body {
    padding: var(--spacing-3);
    padding-bottom: calc(var(--spacing-8) + var(--spacing-3));
  }
  
  .modal-content .modal-actions {
    padding: var(--spacing-3);
  }
}

/* Checkbox styling */
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-3);
  margin-top: var(--spacing-1);
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-weight: normal;
  margin-bottom: 0;
  cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
  width: auto;
  height: 16px;
  width: 16px;
  margin: 0;
  cursor: pointer;
  position: relative;
  top: -1px;
}

.checkbox-group input[type="checkbox"]:focus {
  outline: 2px solid var(--color-scale-blue-3);
  outline-offset: 1px;
}

.drop-target {
  background-color: var(--color-bg-accent) !important;
  transition: background-color 0.2s;
}

.course-tooltip {
  position: fixed;
  min-width: 280px;
  max-width: 360px;
  background: var(--color-bg-default);
  color: var(--color-fg-default);
  border: 1px solid var(--color-border-muted);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow-lg);
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.course-tooltip.tooltip-visible {
  opacity: 1;
  transform: translateY(0);
}

.tooltip-arrow {
  position: absolute;
  width: 12px;
  height: 12px;
  background: var(--color-bg-default);
  border: 1px solid var(--color-border-muted);
  transform: rotate(45deg);
  z-index: 1;
  box-shadow: var(--box-shadow-sm);
}

.course-tooltip[data-position="bottom"] .tooltip-arrow {
  top: -6px;
  border-bottom: none;
  border-right: none;
}

.course-tooltip[data-position="top"] .tooltip-arrow {
  bottom: -6px;
  border-top: none;
  border-left: none;
}

.course-tooltip[data-position="right"] .tooltip-arrow {
  left: -6px;
  border-left: none;
  border-bottom: none;
}

.course-tooltip[data-position="left"] .tooltip-arrow {
  right: -6px;
  border-right: none;
  border-top: none;
}

.tooltip-content {
  padding: 0;
  position: relative;
  z-index: 2;
  background: transparent;
  border-radius: var(--border-radius);
}

.tooltip-header {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-2);
  padding: var(--spacing-3);
  margin-bottom: 0;
  background-color: var(--color-bg-default);
  border-bottom: 1px solid var(--color-border-muted);
  position: relative;
}

.tooltip-header i {
  color: var(--color-scale-blue-5);
  font-size: 20px;
  min-width: 20px;
  margin-top: 2px;
}

.tooltip-title {
  font-weight: 600;
  font-size: var(--text-md);
  color: var(--color-fg-default);
  line-height: 1.3;
}

.tooltip-subtitle {
  font-size: var(--text-sm);
  color: var(--color-fg-muted);
  margin-top: var(--spacing-1);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 250px; /* Limit width to prevent tooltip from becoming too wide */
}

.tooltip-details {
  padding: var(--spacing-3);
  background-color: var(--color-bg-subtle);
}

.tooltip-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  margin-bottom: var(--spacing-2);
  font-size: var(--text-sm);
}

.tooltip-row:last-child {
  margin-bottom: 0;
}

.tooltip-row i {
  color: var(--color-fg-muted);
  font-size: 16px;
  min-width: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tooltip-row-content {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-1);
}

.tooltip-tag {
  background-color: var(--color-bg-default);
  color: var(--color-fg-default);
  font-size: var(--text-xs);
  padding: var(--spacing-1) var(--spacing-2);
  border-radius: 100px;
  font-weight: 500;
  border: 1px solid var(--color-border-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.course-tooltip .text-muted {
  color: var(--color-fg-muted);
  font-style: italic;
}

.moves-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.valid-semesters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-1);
  margin-top: var(--spacing-1);
}

.valid-moves-row {
  margin-top: var(--spacing-1);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
  #content-container {
    grid-template-columns: 2fr 1fr;
  }
}

@media (max-width: 768px) {
  #content-container {
    grid-template-columns: 1fr;
    grid-template-areas: 
      "planner"
      "catalog"
      "requirements";
  }
  
  header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-3);
  }
  
  #plan-controls {
    width: 100%;
    flex-wrap: wrap;
  }
  
  #plan-selector {
    flex: 1;
    min-width: 150px;
  }
}

/* Search functionality */
.no-results {
  padding: var(--spacing-4);
  text-align: center;
  color: var(--color-fg-muted);
  font-style: italic;
  background-color: var(--color-bg-default);
  border-radius: var(--border-radius);
  border: 1px dashed var(--color-border-default);
}

#course-search {
  position: relative;
}

#course-search-input {
  padding-right: 30px; /* Make room for the clear button */
}

#course-search-input:focus {
  border-color: var(--color-scale-blue-5);
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.3);
}

/* Add clear button with X icon when input has content */
#course-search-input:not(:placeholder-shown) + .search-clear-button {
  display: flex;
}

.search-clear-button {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  background: none;
  border: none;
  padding: 0;
  display: none;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  color: var(--color-fg-muted);
  box-shadow: none;
}

.search-clear-button:hover {
  color: var(--color-fg-default);
}