/* ==========================================================================
   CS 5610 Web Development - Student Projects Page
   Modern redesign with Bootstrap 5
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
  /* Northeastern Brand Colors */
  --neu-red: #C8102E;
  --neu-red-dark: #a00d25;
  --neu-black: #000000;

  /* Neutral Colors */
  --gray-50: #f8f9fa;
  --gray-100: #e9ecef;
  --gray-200: #dee2e6;
  --gray-300: #ced4da;
  --gray-500: #adb5bd;
  --gray-600: #6c757d;
  --gray-800: #343a40;
  --gray-900: #212529;

  /* Action Colors */
  --color-code: #24292e;
  --color-demo: #C8102E;
  --color-video: #6366f1;
  --color-slides: #10b981;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

/* --------------------------------------------------------------------------
   Base Styles
   -------------------------------------------------------------------------- */
body {
  font-family: var(--font-family);
  background-color: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
  background-color: #fff;
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--gray-600);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.back-link:hover {
  color: var(--neu-red);
  background-color: var(--gray-100);
}

.course-badge {
  display: inline-block;
  background-color: var(--neu-red);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.025em;
}

/* --------------------------------------------------------------------------
   Main Content
   -------------------------------------------------------------------------- */
.main-content {
  flex: 1;
  padding: var(--space-8) 0;
}

.page-header {
  margin-bottom: var(--space-5);
}

/* --------------------------------------------------------------------------
   Toolbar
   -------------------------------------------------------------------------- */
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  padding: var(--space-4);
  background: #fff;
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-200);
}

.toolbar-left {
  flex: 1;
  min-width: 200px;
}

.toolbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Search Container - Multi Auto Select styles */
.search-container {
  width: 100%;
  max-width: 400px;
}

.search-container input {
  width: 100%;
  padding: 10px 14px;
  font-size: 0.875rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-container input:focus {
  border-color: var(--neu-red);
  box-shadow: 0 0 0 3px rgba(200, 16, 46, 0.1);
}

.search-container input::placeholder {
  color: var(--gray-500);
}

/* Fold Controls */
.fold-controls {
  display: flex;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-right: var(--space-2);
}

.btn-fold {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 10px;
  border: none;
  background: #fff;
  color: var(--gray-600);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-fold:not(:last-child) {
  border-right: 1px solid var(--gray-300);
}

.btn-fold:hover {
  background-color: var(--gray-100);
  color: var(--gray-900);
}

.btn-fold svg {
  width: 16px;
  height: 16px;
}

/* View Toggle Buttons */
.view-toggle {
  display: flex;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.btn-view {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  border: none;
  background: #fff;
  color: var(--gray-600);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-view:not(:last-child) {
  border-right: 1px solid var(--gray-300);
}

.btn-view:hover {
  background-color: var(--gray-100);
  color: var(--gray-900);
}

.btn-view.active {
  background-color: var(--neu-red);
  color: #fff;
}

.btn-view svg {
  width: 16px;
  height: 16px;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: var(--space-3);
}

.page-subtitle {
  font-size: 1.125rem;
  color: var(--gray-600);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Project Sections (Topics) - Collapsible
   -------------------------------------------------------------------------- */
#projects {
  padding: 0;
}

.topic {
  margin-bottom: var(--space-6);
}

.topic-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  cursor: pointer;
  user-select: none;
  padding: var(--space-3) 0;
  margin-bottom: var(--space-4);
  border-bottom: 2px solid var(--neu-red);
  transition: opacity var(--transition-fast);
}

.topic-header:hover {
  opacity: 0.8;
}

.topic-header h3 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--gray-900);
  margin: 0;
  flex: 1;
}

.topic-header .chevron {
  width: 20px;
  height: 20px;
  color: var(--gray-600);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.topic.collapsed .topic-header .chevron {
  transform: rotate(-90deg);
}

.topic-header .project-count {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gray-500);
  background: var(--gray-100);
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

/* Collapsible content */
.topic .projects-grid {
  max-height: 2000px;
  overflow: hidden;
  transition: max-height 0.4s ease, opacity 0.3s ease;
  opacity: 1;
}

.topic.collapsed .projects-grid {
  max-height: 0;
  opacity: 0;
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Project Cards Grid
   -------------------------------------------------------------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--space-5);
}

@media (min-width: 576px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1200px) {
  .projects-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* --------------------------------------------------------------------------
   Project Card - New Layout with Wide Thumbnail Header
   -------------------------------------------------------------------------- */
.project-card {
  background: #fff;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  border-color: var(--gray-300);
}

/* --------------------------------------------------------------------------
   Project Thumbnail - Wide Header Style
   -------------------------------------------------------------------------- */
.project-thumb {
  width: 100%;
  height: 140px;
  overflow: hidden;
  background-color: var(--gray-100);
  position: relative;
}

.project-thumb a {
  display: block;
  width: 100%;
  height: 100%;
}

.project-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.project-card:hover .project-thumb img {
  transform: scale(1.05);
}

/* Placeholder for missing images */
.project-thumb img[src=""],
.project-thumb img:not([src]) {
  display: none;
}

.project-thumb a:only-child:not(:has(img:not([style*="display: none"])))::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
}

/* --------------------------------------------------------------------------
   Card Body
   -------------------------------------------------------------------------- */
.project-card-body {
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  flex: 1;
}

/* --------------------------------------------------------------------------
   Project Info
   -------------------------------------------------------------------------- */
.project-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  margin-bottom: var(--space-3);
}

.student-name {
  font-weight: 600;
  font-size: 0.9375rem;
  margin-bottom: var(--space-1);
  line-height: 1.3;
}

.student-name a {
  color: var(--gray-900);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.student-name a:hover {
  color: var(--neu-red);
}

.student-name-secondary {
  font-weight: 500;
  font-size: 0.8125rem;
  color: var(--gray-600);
  margin-bottom: var(--space-2);
}

.student-name-secondary a {
  color: var(--gray-600);
  text-decoration: none;
}

.student-name-secondary a:hover {
  color: var(--neu-red);
}

.project-name {
  font-size: 0.8125rem;
  color: var(--gray-500);
  margin: 0;
  flex: 1;
  line-height: 1.4;
}

/* --------------------------------------------------------------------------
   Action Links - Icon-only with expand on hover/focus
   -------------------------------------------------------------------------- */
.project-actions {
  display: flex;
  flex-wrap: nowrap;
  gap: var(--space-2);
  justify-content: flex-start;
  margin-top: auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--gray-100);
}

.project-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 8px;
  font-size: 0.6875rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid;
  background: transparent;
  white-space: nowrap;
  overflow: hidden;
}

.project-actions a svg {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.project-actions a .btn-label {
  max-width: 0;
  opacity: 0;
  overflow: hidden;
  transition: max-width 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.2s ease,
              margin 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  margin-left: 0;
}

.project-actions a:hover .btn-label,
.project-actions a:focus .btn-label {
  max-width: 60px;
  opacity: 1;
  margin-left: 6px;
}

.project-actions a:hover,
.project-actions a:focus {
  padding: 8px 12px;
}

/* Code - Dark outline */
.action-code {
  color: var(--color-code);
  border-color: var(--gray-300);
}

.action-code:hover,
.action-code:focus {
  background-color: var(--color-code);
  border-color: var(--color-code);
  color: #fff;
}

/* Demo - Red outline */
.action-demo {
  color: var(--color-demo);
  border-color: var(--color-demo);
}

.action-demo:hover,
.action-demo:focus {
  background-color: var(--color-demo);
  color: #fff;
}

/* Video - Purple outline */
.action-video {
  color: var(--color-video);
  border-color: var(--color-video);
}

.action-video:hover,
.action-video:focus {
  background-color: var(--color-video);
  color: #fff;
}

/* Slides - Green outline */
.action-slides {
  color: var(--color-slides);
  border-color: var(--color-slides);
}

.action-slides:hover,
.action-slides:focus {
  background-color: var(--color-slides);
  color: #fff;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: #fff;
  border-top: 1px solid var(--gray-200);
  padding: var(--space-5) 0;
  margin-top: auto;
}

.site-footer p {
  font-size: 0.875rem;
  color: var(--gray-600);
}

.site-footer a {
  color: var(--neu-red);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.site-footer a:hover {
  color: var(--neu-red-dark);
  text-decoration: underline;
}

/* --------------------------------------------------------------------------
   Loading State & Empty State
   -------------------------------------------------------------------------- */
#projects:empty::before {
  content: "Loading projects...";
  display: block;
  text-align: center;
  color: var(--gray-600);
  font-size: 1rem;
  padding: var(--space-8);
}

.no-results {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  color: var(--gray-600);
}

.no-results p {
  margin: 0;
  font-size: 1rem;
}

.no-results p.text-muted {
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-top: var(--space-2);
}

/* --------------------------------------------------------------------------
   Compact View
   -------------------------------------------------------------------------- */
.compact-view .projects-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.compact-view .project-card {
  flex-direction: row;
  align-items: center;
  border-radius: var(--radius-md);
  height: auto;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}

/* Thumbnail background covering full row */
.compact-view .project-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: var(--thumbnail-url, none);
  background-size: auto 200%;
  background-position: center var(--scroll-bg-position, 50%);
  opacity: 0.5;
  pointer-events: none;
  z-index: -2;
  transition: background-position 0.4s ease-out, opacity 0.3s ease;
}

/* White gradient overlay for text readability */
.compact-view .project-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg,
    rgba(255,255,255,0.95) 0%,
    rgba(255,255,255,0.85) 30%,
    rgba(255,255,255,0.7) 60%,
    rgba(255,255,255,0.5) 100%);
  pointer-events: none;
  z-index: -1;
}

/* Hover parallax effect */
.compact-view .project-card:hover::before {
  background-position: center 30%;
  opacity: 0.65;
}

.compact-view .project-card:hover {
  transform: none;
}

.compact-view .project-thumb {
  display: none;
}

.compact-view .project-card-body {
  flex-direction: row;
  align-items: center;
  padding: var(--space-3) var(--space-4);
  gap: var(--space-4);
  width: 100%;
}

.compact-view .project-info {
  flex-direction: row;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: 0;
  flex: 1;
  min-width: 0;
}

.compact-view .project-name {
  /* Thumbnail background now on .project-card */
}

.compact-view .student-name {
  margin-bottom: 0;
  font-size: 0.875rem;
  white-space: nowrap;
  min-width: 150px;
}

.compact-view .student-name-secondary {
  display: none;
}

.compact-view .project-name {
  flex: 1;
  font-size: 0.8125rem;
  color: var(--gray-600);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.compact-view .project-actions {
  padding-top: 0;
  border-top: none;
  margin-top: 0;
  flex-shrink: 0;
}

/* In compact view, always show icons only (no expand) */
.compact-view .project-actions a {
  padding: 6px;
}

.compact-view .project-actions a:hover,
.compact-view .project-actions a:focus {
  padding: 6px;
}

.compact-view .project-actions a .btn-label {
  display: none;
}

.compact-view .project-actions a svg {
  width: 14px;
  height: 14px;
}

/* Responsive compact view */
@media (max-width: 768px) {
  .compact-view .project-card-body {
    flex-wrap: wrap;
  }

  .compact-view .project-info {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
    width: 100%;
  }

  .compact-view .student-name {
    min-width: auto;
  }

  .compact-view .project-name {
    white-space: normal;
  }

  .compact-view .project-actions {
    width: 100%;
    justify-content: flex-start;
    padding-top: var(--space-2);
    margin-top: var(--space-2);
    border-top: 1px solid var(--gray-100);
  }
}

/* --------------------------------------------------------------------------
   Legacy class overrides (for D3 generated content)
   -------------------------------------------------------------------------- */
.topic.row {
  display: block;
  margin: 0;
  width: 100%;
}

.col-sm-12 {
  width: 100%;
  padding: 0;
}