style.css

:root {
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --secondary-color: #10b981;
  --accent-color: #f59e0b;
  --success-color: #059669;
  --error-color: #dc2626;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --white: #fffef7;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --border-radius: 8px;
  --border-radius-lg: 12px;
  --transition: all 0.2s ease;
  --spacing: 8px;
  --header-height: 73px;

  --background-color: #fff5ee;
}

/* style.css */

/* Dark Mode Overrides */
[data-theme="dark"] {
  --primary-color: #60a5fa; /* Lighter blue for better contrast */
  --primary-dark: #3b82f6;
  --primary-light: #93c5fd;

  --background-color: #121212; /* Deep dark background */

  /* Invert Grays for Dark Mode */
  --gray-50: #18181b;
  --gray-100: #27272a; /* Darker element bg */
  --gray-200: #3f3f46; /* Dark borders */
  --gray-300: #52525b;
  --gray-400: #a1a1aa;
  --gray-500: #d4d4d8; /* Lighter secondary text */
  --gray-600: #e4e4e7; /* Main text */
  --gray-700: #f4f4f5;
  --gray-800: #fafafa;
  --gray-900: #ffffff; /* Headings */

  --white: #1e1e1e; /* Card background */

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

/* Header Layout Adjustment */
.header-content {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative; /* Needed for absolute positioning of toggle */
}

/* Position the toggle button to the right */
.theme-toggle {
  position: absolute;
  right: 0;
  background: transparent;
  border: 1px solid var(--gray-200);
  color: var(--gray-600);
}

.theme-toggle:hover {
  background: var(--gray-100);
  color: var(--primary-color);
}

/* Optional: Smooth transition for color changes */
body,
.header,
.pdf-card,
.tab-btn,
input,
.modal-content {
  transition:
    background-color 0.3s ease,
    color 0.3s ease,
    border-color 0.3s ease;
}

/* Fix for Google Ad backgrounds in Dark Mode (Optional) */
[data-theme="dark"] ins.adsbygoogle {
  background: var(--gray-50);
}

/* Fix Footer in Dark Mode */
[data-theme="dark"] footer {
  /* Force the background to be black or very dark gray */
  background-color: #000000;

  /* Reset the text color to a readable gray */
  color: var(--gray-400);

  /* Optional: Add a subtle top border to separate it from the body */
  border-top: 1px solid var(--gray-200);
}

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

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    sans-serif;
  line-height: 1.5;
  color: var(--gray-800);
  background: var(--background-color);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 calc(var(--spacing) * 2);
  width: 100%;
}

.header {
  background: var(--background-color);

  border-bottom: 1px solid var(--gray-200);
  padding: calc(var(--spacing) * 2) 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing) * 1.5);
  font-weight: 700;
  color: var(--primary-color);
}

.logo i {
  font-size: 2rem;
}

.logo h1 {
  font-size: 1.75rem;
  font-weight: 700;
}

.semester-tabs {
  background: var(--background-color);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: var(--header-height);
  z-index: 99;
}

.tabs-wrapper {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  padding: calc(var(--spacing) * 2) 0;
}

.tab-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(var(--spacing) * 0.5);
  padding: calc(var(--spacing) * 2);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  color: var(--gray-600);
  font-weight: 500;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.tab-btn::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 3px;
  background: var(--primary-color);
  transition: var(--transition);
}

.tab-btn:hover {
  background: var(--background-color);

  color: var(--primary-color);
}

.tab-btn.active {
  color: var(--primary-color);
}

.tab-btn.active::after {
  width: 60%;
}

.tab-number {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1;
}

.tab-label {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.main {
  flex: 1;
  padding: calc(var(--spacing) * 4) 0;
}

.controls-section {
  margin-bottom: calc(var(--spacing) * 3);
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing) * 2);
}

.search-box {
  position: relative;
  width: 100%;
}

.search-box i {
  position: absolute;
  left: calc(var(--spacing) * 2);
  top: 50%;
  transform: translateY(-50%);
  color: var(--gray-400);
  font-size: 1rem;
  pointer-events: none;
}

.search-box input {
  width: 100%;
  padding: calc(var(--spacing) * 1.5) calc(var(--spacing) * 2)
    calc(var(--spacing) * 1.5) calc(var(--spacing) * 6);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
  background: var(--background-color);
  font-family: inherit;
}

.search-box input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-box input::placeholder {
  color: var(--gray-400);
}

.filter-section {
  display: flex;
  gap: calc(var(--spacing) * 1.5);
  flex-wrap: wrap;
}

.filter-btn {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing) * 1);
  padding: calc(var(--spacing) * 1.5) calc(var(--spacing) * 3);
  background: var(--background-color);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-700);
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  white-space: nowrap;
}

.filter-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  background: var(--background-color);
}

.filter-btn.active {
  background: var(--primary-color);
  color: var(--white);
  border-color: var(--primary-color);
}

.filter-btn i {
  font-size: 0.875rem;
}

.stats-bar {
  color: var(--gray-500);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: calc(var(--spacing) * 3);
  padding: calc(var(--spacing) * 1.5);
  background: var(--background-color);
  border-radius: var(--border-radius);
  border: 1px solid var(--gray-200);
}

.pdf-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: calc(var(--spacing) * 3);
}

.pdf-card {
  background: var(--background-color);
  border-radius: var(--border-radius-lg);
  padding: calc(var(--spacing) * 3);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing) * 2);
}

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

.pdf-header {
  display: flex;
  align-items: flex-start;
  gap: calc(var(--spacing) * 2);
}

.pdf-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--primary-dark)
  );
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.25rem;
  flex-shrink: 0;
}

.pdf-info {
  flex: 1;
  min-width: 0;
}

.pdf-info h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: calc(var(--spacing) * 0.5);
  line-height: 1.4;
  word-break: break-word;
}

.pdf-meta {
  display: flex;
  gap: calc(var(--spacing) * 1.5);
  flex-wrap: wrap;
}

.pdf-category {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--spacing) * 0.5);
  padding: calc(var(--spacing) * 0.5) calc(var(--spacing) * 1.5);
  background: var(--gray-100);
  color: var(--gray-700);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
}

.pdf-date {
  color: var(--gray-500);
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  gap: calc(var(--spacing) * 0.5);
}

.pdf-description {
  color: var(--gray-600);
  font-size: 0.875rem;
  line-height: 1.6;
  word-break: break-word;
}

.pdf-actions {
  display: flex;
  gap: calc(var(--spacing) * 1.5);
  margin-top: auto;
}

.btn {
  padding: calc(var(--spacing) * 1.5) calc(var(--spacing) * 2);
  border-radius: var(--border-radius);
  font-weight: 500;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: calc(var(--spacing) * 1);
  cursor: pointer;
  border: none;
  font-size: 0.875rem;
  transition: var(--transition);
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn-primary {
  background: var(--primary-color);
  color: var(--white);
  flex: 1;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  background: var(--gray-100);
  color: var(--gray-700);
  border: 1px solid var(--gray-200);
}

.btn-secondary:hover {
  background: var(--gray-200);
}

.btn-secondary:active {
  transform: scale(0.98);
}

.btn-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius);
  background: var(--gray-100);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
  color: var(--gray-600);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn-icon:hover {
  background: var(--gray-200);
  color: var(--gray-800);
}

.btn-icon:active {
  transform: scale(0.95);
}

.empty-state {
  text-align: center;
  padding: calc(var(--spacing) * 8) calc(var(--spacing) * 4);
  color: var(--gray-500);
  background: var(--background-color);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--gray-200);
}

.empty-state i {
  font-size: 4rem;
  margin-bottom: calc(var(--spacing) * 2);
  color: var(--gray-300);
}

.empty-state h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: calc(var(--spacing) * 1);
  color: var(--gray-700);
}

.empty-state p {
  font-size: 0.875rem;
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.75);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: calc(var(--spacing) * 2);
  backdrop-filter: blur(4px);
}

.modal.active {
  display: flex;
}

.modal-content {
  background: var(--background-color);
  border-radius: var(--border-radius-lg);
  width: 100%;
  max-width: 90vw;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(var(--spacing) * 3);
  border-bottom: 1px solid var(--gray-200);
  background: var(--background-color);

  gap: calc(var(--spacing) * 2);
}

.modal-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-900);
  word-break: break-word;
  flex: 1;
}

.modal-actions {
  display: flex;
  gap: calc(var(--spacing) * 1);
  flex-shrink: 0;
}

.modal-body {
  flex: 1;
  padding: 0;
  overflow: hidden;
}

.modal-body iframe {
  border: none;
  width: 100%;
  height: 100%;
  min-height: 600px;
}

.share-modal {
  max-width: 500px;
  max-height: none;
}

.share-modal .modal-body {
  padding: calc(var(--spacing) * 3);
}

.share-modal p {
  margin-bottom: calc(var(--spacing) * 2);
  color: var(--gray-600);
}

.share-link-container {
  display: flex;
  gap: calc(var(--spacing) * 1.5);
  margin-bottom: calc(var(--spacing) * 2);
}

.share-link-container input {
  flex: 1;
  padding: calc(var(--spacing) * 1.5);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  background: var(--background-color);

  font-family: monospace;
  font-size: 0.875rem;
  min-width: 0;
}

.share-success {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing) * 1);
  color: var(--success-color);
  font-weight: 500;
  padding: calc(var(--spacing) * 1.5);
  background: rgba(5, 150, 105, 0.1);
  border-radius: var(--border-radius);
}

.toast {
  position: fixed;
  bottom: calc(var(--spacing) * 3);
  right: calc(var(--spacing) * 3);
  background: var(--success-color);
  color: var(--white);
  padding: calc(var(--spacing) * 2) calc(var(--spacing) * 3);
  border-radius: var(--border-radius);
  display: none;
  align-items: center;
  gap: calc(var(--spacing) * 1);
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1100;
  transform: translateX(100%);
  transition: var(--transition);
  max-width: calc(100vw - calc(var(--spacing) * 6));
}

.toast.show {
  display: flex;
  transform: translateX(0);
}

footer {
  background: var(--gray-900);
  color: var(--gray-300);
  padding: calc(var(--spacing) * 3) calc(var(--spacing) * 2);
  text-align: center;
  margin-top: auto;
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;

  gap: calc(var(--spacing) * 1);
}

/* --- GitHub Open Source Badge --- */
.github-link {
  display: inline-flex;
  align-items: center;
  align-self: center;
  gap: 8px;
  background: var(--gray-100);
  color: var(--gray-700);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid var(--gray-200);
  margin-top: calc(var(--spacing) * 1);
  margin-bottom: calc(var(--spacing) * 0.5);
  transition: var(--transition);
}

.github-link i {
  font-size: 1rem;
}

.github-link:hover {
  background: #24292e; /* GitHub Brand Black */
  color: white;
  border-color: #24292e;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Dark Mode Overrides for the Badge */
[data-theme="dark"] .github-link {
  background: var(--gray-100); /* Dark gray background */
  color: var(--gray-500);
  border-color: var(--gray-200);
}

[data-theme="dark"] .github-link:hover {
  background: white;
  color: black;
  border-color: white;
}

.thanks-message {
  font-size: 0.875rem;
  color: var(--gray-400);
  margin-bottom: calc(var(--spacing) * 1);
}

.contact-info {
  font-size: 0.875rem;
  color: var(--gray-400);
  word-break: break-word;
}

.contact-info a {
  color: var(--primary-light);
  text-decoration: none;
  transition: var(--transition);
}

.contact-info a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

.credits {
  font-size: 0.8125rem;
  font-weight: 400;
}

.credits a {
  color: var(--primary-light);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
}

.credits a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

.heart {
  color: #ef4444;
  animation: pulse 1.5s infinite;
  display: inline-block;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.15);
  }
}

.copyright-text {
  font-size: 0.75rem;
  color: var(--gray-500);
  margin-top: calc(var(--spacing) * 1);
}

@media (max-width: 1024px) {
  .container {
    padding: 0 calc(var(--spacing) * 2);
  }

  .pdf-grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: calc(var(--spacing) * 2);
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 65px;
  }

  .header {
    padding: calc(var(--spacing) * 1.5) 0;
  }

  .logo i {
    font-size: 1.75rem;
  }

  .logo h1 {
    font-size: 1.5rem;
  }

  .semester-tabs {
    top: 65px;
  }

  .tabs-wrapper {
    gap: 0;
    padding: calc(var(--spacing) * 1.5) 0;
  }

  .tab-btn {
    padding: calc(var(--spacing) * 1.5) calc(var(--spacing) * 0.5);
    gap: calc(var(--spacing) * 0.25);
  }

  .tab-number {
    font-size: 1.5rem;
  }

  .tab-label {
    font-size: 0.75rem;
  }

  .main {
    padding: calc(var(--spacing) * 3) 0;
  }

  .controls-section {
    gap: calc(var(--spacing) * 1.5);
  }

  .search-box input {
    font-size: 0.9375rem;
    padding: calc(var(--spacing) * 1.25) calc(var(--spacing) * 1.5)
      calc(var(--spacing) * 1.25) calc(var(--spacing) * 5);
  }

  .search-box i {
    left: calc(var(--spacing) * 1.5);
  }

  .filter-section {
    gap: calc(var(--spacing) * 1);
  }

  .filter-btn {
    padding: calc(var(--spacing) * 1.25) calc(var(--spacing) * 2);
    font-size: 0.8125rem;
  }

  .pdf-grid {
    grid-template-columns: 1fr;
    gap: calc(var(--spacing) * 2);
  }

  .modal-content {
    max-width: 95vw;
    max-height: 95vh;
  }

  .modal-header {
    padding: calc(var(--spacing) * 2);
  }

  .modal-header h3 {
    font-size: 1rem;
  }

  .modal-body iframe {
    min-height: 500px;
  }

  .share-link-container {
    flex-direction: column;
  }

  .share-modal .modal-body {
    padding: calc(var(--spacing) * 2);
  }

  .toast {
    bottom: calc(var(--spacing) * 2);
    right: calc(var(--spacing) * 2);
    left: calc(var(--spacing) * 2);
    max-width: none;
  }

  .empty-state {
    padding: calc(var(--spacing) * 6) calc(var(--spacing) * 3);
  }

  .empty-state i {
    font-size: 3rem;
  }

  .empty-state h3 {
    font-size: 1.125rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 calc(var(--spacing) * 1.5);
  }

  .logo i {
    font-size: 1.5rem;
  }

  .logo h1 {
    font-size: 1.25rem;
  }

  .tab-btn {
    padding: calc(var(--spacing) * 1.25) calc(var(--spacing) * 0.25);
  }

  .tab-number {
    font-size: 1.25rem;
  }

  .tab-label {
    font-size: 0.625rem;
    letter-spacing: 0.25px;
  }

  .filter-btn {
    flex: 1;
    min-width: calc(50% - calc(var(--spacing) * 0.5));
    justify-content: center;
  }

  .pdf-card {
    padding: calc(var(--spacing) * 2);
  }

  .pdf-header {
    gap: calc(var(--spacing) * 1.5);
  }

  .pdf-icon {
    width: 40px;
    height: 40px;
    font-size: 1.125rem;
  }

  .pdf-info h3 {
    font-size: 0.9375rem;
  }

  .pdf-actions {
    flex-direction: column;
    gap: calc(var(--spacing) * 1);
  }

  .btn {
    width: 100%;
  }

  .modal {
    padding: 0;
  }

  .modal-content {
    max-width: 100vw;
    max-height: 100vh;
    border-radius: 0;
  }

  .modal-header {
    padding: calc(var(--spacing) * 1.5);
    gap: calc(var(--spacing) * 1);
  }

  .modal-header h3 {
    font-size: 0.9375rem;
  }

  .btn-icon {
    width: 36px;
    height: 36px;
  }

  .modal-body iframe {
    min-height: calc(100vh - 65px);
  }

  .share-modal {
    max-width: 100vw;
  }

  .share-modal .modal-content {
    border-radius: var(--border-radius-lg);
    max-height: auto;
  }

  .share-modal .modal-body {
    padding: calc(var(--spacing) * 1.5);
  }

  .footer-content {
    gap: calc(var(--spacing) * 0.75);
  }

  .thanks-message {
    font-size: 0.8125rem;
    margin-bottom: calc(var(--spacing) * 0.75);
  }

  .contact-info {
    font-size: 0.8125rem;
  }

  .credits {
    font-size: 0.75rem;
  }

  .copyright-text {
    font-size: 0.6875rem;
    margin-top: calc(var(--spacing) * 0.75);
  }
}

@media (max-width: 360px) {
  .tab-number {
    font-size: 1.125rem;
  }

  .tab-label {
    font-size: 0.5625rem;
  }

  .filter-btn {
    font-size: 0.75rem;
    padding: calc(var(--spacing) * 1) calc(var(--spacing) * 1.5);
  }
}

html {
  scroll-behavior: smooth;
}

button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-300);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-400);
}

@media (hover: none) and (pointer: coarse) {
  .pdf-card:hover {
    transform: none;
  }

  .tab-btn:hover,
  .filter-btn:hover,
  .btn-icon:hover {
    background: transparent;
  }

  .tab-btn.active:hover {
    background: var(--background-color);
  }

  .filter-btn.active:hover {
    background: var(--primary-color);
  }

  ::-webkit-scrollbar {
    width: 0;
    height: 0;
  }
}

.pdf-viewer-layout {
  display: flex;
  flex-direction: row;
  padding: 0;
}

.modal-main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.modal-sidebar {
  width: 350px;
  background: var(--background-color);

  border-left: 1px solid var(--gray-200);
  padding: calc(var(--spacing) * 3);
  display: flex;
  flex-direction: column;
  max-height: 90vh;
}

.modal-sidebar h4 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: calc(var(--spacing) * 2);

  /* Flexbox magic for alignment */
  display: flex;
  align-items: center;
  justify-content: space-between; /* Pushes text to left, X to right */
  width: 100%;
}

.comments-list {
  flex: 1;
  overflow-y: auto;
  padding-right: calc(var(--spacing));
  margin-bottom: calc(var(--spacing) * 2);
}

.comment-item {
  border-bottom: 1px dashed var(--gray-200);
  padding: calc(var(--spacing) * 1.5) 0;
}

.comment-item:last-child {
  border-bottom: none;
}

.comment-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: calc(var(--spacing) * 0.5);
}

.comment-author {
  font-weight: 600;
  color: var(--primary-dark);
  font-size: 0.9375rem;
}

.comment-date {
  font-size: 0.75rem;
  color: var(--gray-500);
}

.comment-text {
  font-size: 0.875rem;
  color: var(--gray-700);
  line-height: 1.4;
}

.comment-form {
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing) * 1);
  padding-top: calc(var(--spacing) * 1);
  border-top: 1px solid var(--gray-200);
}

.comment-form textarea,
.comment-form input {
  width: 100%;
  padding: calc(var(--spacing) * 1);
  border: 1px solid var(--gray-300);
  border-radius: var(--border-radius);
  font-size: 0.9375rem;
  font-family: inherit;
  transition: var(--transition);
  resize: vertical;
}

.comment-form textarea:focus,
.comment-form input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.comment-form textarea {
  min-height: 80px;
  max-height: 150px;
}

#submitCommentBtn {
  width: 100%;
}

#openCommentsBtn {
  display: none;
}

.drawer-close {
  display: none;
}

@media (max-width: 768px) {
  .modal-sidebar {
    position: fixed;
    left: 0;
    bottom: -100%;
    width: 100%;
    height: 70vh;
    max-height: 80vh;
    background: var(--background-color);

    border-top: 2px solid var(--gray-200);
    border-radius: 16px 16px 0 0;
    box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    transition:
      transform 0.35s ease,
      bottom 0.35s ease;
    overflow: hidden;
  }

  .modal-sidebar.active {
    bottom: 0;
  }

  .modal-sidebar h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin: 0;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .drawer-close {
    background: none;
    border: none;
    font-size: 1.5rem; /* Increased size slightly for easier tapping */
    display: inline-flex;
    color: var(--gray-700);
    padding: 8px; /* Add padding to make the touch target bigger */
    cursor: pointer;
  }

  .comments-list {
    flex: 1 1 auto;
    overflow-y: auto;
    padding: 1rem 1.25rem;
  }

  .comment-form {
    flex-shrink: 0;
    background: var(--gray-100);
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--gray-200);
    position: sticky;
    bottom: 0;
  }

  .comment-form textarea,
  .comment-form input {
    font-size: 0.9rem;
    padding: 0.5rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    width: 100%;
    margin-bottom: 0.5rem;
  }

  #submitCommentBtn {
    width: 100%;
  }

  #openCommentsBtn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.95rem;
    color: white;
    background: var(--primary-color, #2563eb);
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 999px;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 9998;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  }

  #openCommentsBtn i {
    font-size: 1rem;
  }

  .pdf-viewer-layout {
    flex-direction: column;
  }
}

#preloader {
  background: var(--background-color);
  height: 100%;
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1031;
}
#preloader.hidden {
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.5s ease,
    visibility 0s 0.5s;
}

.book {
  --color: var(--primary-color);
  --duration: 6.8s;
  width: 32px;
  height: 12px;
  position: absolute;
  left: 50%;
  top: 50%;
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}
.book .inner {
  width: 32px;
  height: 12px;
  position: relative;
  transform-origin: 2px 2px;
  transform: rotateZ(-90deg);
  animation: book var(--duration) ease infinite;
  will-change: transform;
}
.book .inner .left,
.book .inner .right {
  width: 60px;
  height: 4px;
  top: 0;
  border-radius: 2px;
  background: var(--color);
  position: absolute;
}
.book .inner .left:before,
.book .inner .right:before {
  content: "";
  width: 48px;
  height: 4px;
  border-radius: 2px;
  background: inherit;
  position: absolute;
  top: -10px;
  left: 6px;
}
.book .inner .left {
  right: 28px;
  transform-origin: 58px 2px;
  transform: rotateZ(90deg);
  animation: left var(--duration) ease infinite;
}
.book .inner .right {
  left: 28px;
  transform-origin: 2px 2px;
  transform: rotateZ(-90deg);
  animation: right var(--duration) ease infinite;
}
.book .inner .middle {
  width: 32px;
  height: 12px;
  border: 4px solid var(--color);
  border-top: 0;
  border-radius: 0 0 9px 9px;
  transform: translateY(2px);
}
.book ul {
  margin: 0;
  padding: 0;
  list-style: none;
  position: absolute;
  left: 50%;
  top: 0;
}
.book ul li {
  height: 4px;
  border-radius: 2px;
  transform-origin: 100% 2px;
  width: 48px;
  right: 0;
  top: -10px;
  position: absolute;
  background: var(--color);
  transform: rotateZ(0deg) translateX(-18px);
  animation-duration: var(--duration);
  animation-timing-function: ease;
  animation-iteration-count: infinite;
}
.book ul li:nth-child(0) {
  animation-name: page-0;
}
.book ul li:nth-child(1) {
  animation-name: page-1;
}
.book ul li:nth-child(2) {
  animation-name: page-2;
}
.book ul li:nth-child(3) {
  animation-name: page-3;
}
.book ul li:nth-child(4) {
  animation-name: page-4;
}
.book ul li:nth-child(5) {
  animation-name: page-5;
}
.book ul li:nth-child(6) {
  animation-name: page-6;
}
.book ul li:nth-child(7) {
  animation-name: page-7;
}
.book ul li:nth-child(8) {
  animation-name: page-8;
}
.book ul li:nth-child(9) {
  animation-name: page-9;
}
.book ul li:nth-child(10) {
  animation-name: page-10;
}
.book ul li:nth-child(11) {
  animation-name: page-11;
}
.book ul li:nth-child(12) {
  animation-name: page-12;
}
.book ul li:nth-child(13) {
  animation-name: page-13;
}
.book ul li:nth-child(14) {
  animation-name: page-14;
}
.book ul li:nth-child(15) {
  animation-name: page-15;
}
.book ul li:nth-child(16) {
  animation-name: page-16;
}
.book ul li:nth-child(17) {
  animation-name: page-17;
}
.book ul li:nth-child(18) {
  animation-name: page-18;
}

@keyframes page-0 {
  4% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  13%,
  54% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  63% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-1 {
  5.86% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  14.74%,
  55.86% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  64.74% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-2 {
  7.72% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  16.48%,
  57.72% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  66.48% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-3 {
  9.58% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  18.22%,
  59.58% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  68.22% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-4 {
  11.44% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  19.96%,
  61.44% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  69.96% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-5 {
  13.3% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  21.7%,
  63.3% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  71.7% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-6 {
  15.16% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  23.44%,
  65.16% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  73.44% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-7 {
  17.02% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  25.18%,
  67.02% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  75.18% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-8 {
  18.88% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  26.92%,
  68.88% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  76.92% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-9 {
  20.74% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  28.66%,
  70.74% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  78.66% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-10 {
  22.6% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  30.4%,
  72.6% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  80.4% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-11 {
  24.46% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  32.14%,
  74.46% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  82.14% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-12 {
  26.32% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  33.88%,
  76.32% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  83.88% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-13 {
  28.18% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  35.62%,
  78.18% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  85.62% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-14 {
  30.04% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  37.36%,
  80.04% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  87.36% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-15 {
  31.9% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  39.1%,
  81.9% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  89.1% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-16 {
  33.76% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  40.84%,
  83.76% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  90.84% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-17 {
  35.62% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  42.58%,
  85.62% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  92.58% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes page-18 {
  37.48% {
    transform: rotateZ(0deg) translateX(-18px);
  }
  44.32%,
  87.48% {
    transform: rotateZ(180deg) translateX(-18px);
  }
  94.32% {
    transform: rotateZ(0deg) translateX(-18px);
  }
}
@keyframes left {
  4% {
    transform: rotateZ(90deg);
  }
  10%,
  40% {
    transform: rotateZ(0deg);
  }
  46%,
  54% {
    transform: rotateZ(90deg);
  }
  60%,
  90% {
    transform: rotateZ(0deg);
  }
  96% {
    transform: rotateZ(90deg);
  }
}
@keyframes right {
  4% {
    transform: rotateZ(-90deg);
  }
  10%,
  40% {
    transform: rotateZ(0deg);
  }
  46%,
  54% {
    transform: rotateZ(-90deg);
  }
  60%,
  90% {
    transform: rotateZ(0deg);
  }
  96% {
    transform: rotateZ(-90deg);
  }
}
@keyframes book {
  4% {
    transform: rotateZ(-90deg);
  }
  10%,
  40% {
    transform: rotateZ(0deg);
    transform-origin: 2px 2px;
  }
  40.01%,
  59.99% {
    transform-origin: 30px 2px;
  }
  46%,
  54% {
    transform: rotateZ(90deg);
  }
  60%,
  90% {
    transform: rotateZ(0deg);
    transform-origin: 2px 2px;
  }
  96% {
    transform: rotateZ(-90deg);
  }
}
.loader-text {
  position: absolute;
  top: calc(50% + 30px);
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--gray-700, #555);
  letter-spacing: 0.03em;
  animation: fadeInOut 2s ease-in-out infinite;
}

.loader-text span {
  color: var(--primary-color);

  font-weight: 600;
}

@keyframes fadeInOut {
  0%,
  100% {
    opacity: 0.4;
  }
  50% {
    opacity: 1;
  }
}

.go-to-top {
  position: fixed;
  bottom: calc(var(--spacing) * 4);
  right: calc(var(--spacing) * 10);
  z-index: 900;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  background: var(--primary-color);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.go-to-top:hover {
  background: var(--primary-dark);
  color: var(--white);
}

.go-to-top.show {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

@media (max-width: 768px) {
  .go-to-top {
    bottom: calc(var(--spacing) * 7);
    right: calc(var(--spacing) * 7);
  }
}

.upload-btn {
  position: fixed;
  bottom: calc(var(--spacing) * 4);
  right: calc(var(--spacing) * 4);
  z-index: 900;
  opacity: 1;
  visibility: visible;
  transform: translateY(0px);
  background: var(--primary-color);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.upload-btn:hover {
  background: var(--primary-dark);
  color: var(--white);
}

@media (max-width: 768px) {
  .upload-btn {
    bottom: calc(var(--spacing) * 7);
    right: calc(var(--spacing) * 2);
  }
}

.alomole-promo {
  position: fixed;

  bottom: calc(var(--spacing) * 12);
  right: calc(var(--spacing) * 4);
  left: auto;
  z-index: 901;
  background: var(--background-color);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius-lg);
  padding: calc(var(--spacing) * 2);

  box-shadow: var(--shadow-lg);
  transition:
    opacity 0.3s,
    transform 0.3s;

  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(var(--spacing) * 0.5);
  max-width: 140px;
}

.alomole-promo.hidden {
  opacity: 0;
  visibility: hidden;
  transform: scale(0.9);
}

.promo-close-btn {
  position: absolute;
  top: 4px;
  right: 4px;
  background: var(--gray-100);
  border: none;
  border-radius: 50%;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-600);
  font-size: 0.75rem;
  cursor: pointer;
  transition: var(--transition);
}

.promo-close-btn:hover {
  background: var(--error-color);
  color: var(--white);
}

.promo-link {
  text-decoration: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: calc(var(--spacing) * 0.25);
  cursor: pointer;
}

.promo-link img {
  width: 100px;
  height: 100px;
  border-radius: var(--border-radius);
  border: 1px solid var(--gray-200);
  padding: 4px;
  background: var(--background-color);
}

.promo-text {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--primary-color);
  text-align: center;
  word-break: break-word;
}

.promo-text-body {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gray-600);
  text-align: center;
  word-break: break-word;
  line-height: 1.2;
}

@media (max-width: 768px) {
  .alomole-promo {
    bottom: calc(var(--spacing) * 5);
    left: calc(var(--spacing) * 2);
    right: auto;
    padding: calc(var(--spacing) * 1.5);
  }

  .promo-close-btn {
    right: 4px;
  }
}

/* --- NEW Policy Styles for Consistent Readability --- */
.main-policy {
  /* text-align: center; */
  margin: calc(var(--spacing) * 4) calc(var(--spacing) * 2);
  padding: calc(var(--spacing) * 8) calc(var(--spacing) * 4);
  color: var(--gray-500);
  background: var(--background-color);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--gray-200);
}
.main-policy h2 {
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: calc(var(--spacing) * 2);
  padding-bottom: calc(var(--spacing));
  border-bottom: 1px solid var(--gray-200);
}

.main-policy h3 {
  font-size: 1.5rem; /* Secondary heading */
  font-weight: 600;
  color: var(--primary-dark);
  margin-top: calc(var(--spacing) * 4);
  margin-bottom: calc(var(--spacing) * 1.5);
}

.main-policy p,
.main-policy li {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--gray-700);
  margin-bottom: calc(var(--spacing) * 2);
}

.main-policy ul,
.main-policy ol {
  list-style-position: inside;
  padding-left: calc(var(--spacing) * 2);
  margin-bottom: calc(var(--spacing) * 2);
}

.main-policy li {
  margin-bottom: calc(var(--spacing));
  list-style-type: disc;
}

.main-policy ol li {
  list-style-type: decimal;
}

/* Footer Policy Links */
.footer-content .policy-links {
  font-size: 0.75rem;
  color: var(--gray-400);
  margin-top: calc(var(--spacing));
}

.footer-content .policy-links a {
  color: var(--gray-400);
  text-decoration: none;
  transition: var(--transition);
  font-weight: 500;
}

.footer-content .policy-links a:hover {
  color: var(--primary-light);
  text-decoration: underline;
}

/* Responsive adjustments for headings */
@media (max-width: 768px) {
  .main-policy {
    padding: calc(var(--spacing) * 6) calc(var(--spacing) * 3);
  }
  .main-policy h2 {
    font-size: 2rem;
    margin-bottom: calc(var(--spacing) * 1.5);
  }
  .main-policy h3 {
    font-size: 1.125rem;
    margin-top: calc(var(--spacing) * 3);
  }
  .main-policy p,
  .main-policy li {
    font-size: 0.9375rem;
  }
}

/* For Upload */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 16px;
  position: relative;
}
.form-group label {
  font-weight: 600;
  color: var(--gray-700);
}
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: calc(var(--spacing) * 1.5) calc(var(--spacing) * 2);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: var(--transition);
  background: var(--background-color);
  font-family: inherit;
}
/* Adjust padding for password icon */
.form-group input[type="password"],
.form-group input[type="email"] {
  padding-right: calc(var(--spacing) * 5);
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Password visibility toggle */
.password-toggle {
  position: absolute;
  right: 12px;
  top: 44px; /* Adjust based on label height */
  cursor: pointer;
  color: var(--gray-400);
  transition: var(--transition);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.password-toggle:hover {
  color: var(--primary-color);
}

/* Form toggle link (e.g., "Sign up instead") */
.form-toggle-link {
  text-align: center;
  margin-top: 16px;
  font-size: 0.875rem;
}
.form-toggle-link a {
  color: var(--primary-color);
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}
.form-toggle-link a:hover {
  text-decoration: underline;
}

/* Signup warning message */
.signup-warning {
  font-size: 0.8125rem;
  color: var(--gray-600);
  background-color: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  padding: calc(var(--spacing) * 1.5);
  margin-bottom: 16px;
  line-height: 1.5;
}
.signup-warning i {
  color: var(--accent-color);
  margin-right: 4px;
}
.signup-warning strong {
  color: var(--gray-800);
}

/* Status messages (re-styled from original) */
.status-message {
  font-weight: 500;
  margin-top: 16px;
  text-align: center;
}
.status-message.error {
  color: var(--error-color);
}
.status-message.success {
  color: var(--success-color);
}

/* --- Admin Header --- */
.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}
.admin-header h2 {
  font-size: 1.25rem;
  word-break: break-all;
}

/* --- Toast Notification --- */
#toastContainer {
  position: fixed;
  top: calc(var(--spacing) * 2);
  right: calc(var(--spacing) * 2);
  z-index: 1200;
  display: flex;
  flex-direction: column;
  gap: var(--spacing);
  max-width: 350px;
  width: calc(100% - calc(var(--spacing) * 4));
}
.toast.custom {
  /* Using .custom to avoid conflict with style.css .toast */
  display: flex;
  align-items: center;
  gap: var(--spacing);
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1100;
  padding: calc(var(--spacing) * 2);
  border-radius: var(--border-radius);
  color: var(--white);
  transform: translateX(120%);
  transition: transform 0.3s ease;
  opacity: 0;
}
.toast.custom.show {
  transform: translateX(0);
  opacity: 1;
}
.toast.custom.success {
  background: var(--success-color);
}
.toast.custom.error {
  background: var(--error-color);
}
.toast.custom i {
  font-size: 1.25rem;
}

@media (max-width: 480px) {
  #toastContainer {
    top: var(--spacing);
    right: var(--spacing);
    left: var(--spacing);
    width: auto;
    max-width: none;
  }
}
/* --- CHEMISTRY MAINTENANCE TERMINAL (RESPONSIVE) --- */
.maintenance-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: #050505; /* Lab Black */
  z-index: 2147483647;
  display: flex;
  align-items: center;
  justify-content: center;

  /* Hidden by default */
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s ease;
  font-family: "Courier New", Courier, monospace;
  padding: 1rem; /* Prevent edges touching on mobile */
}

.maintenance-overlay.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.terminal-window {
  width: 100%;
  max-width: 650px;
  background: #000;
  border: 1px solid #333;
  box-shadow: 0 0 30px rgba(0, 255, 0, 0.1);
  border-radius: 6px;
  overflow: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
}

/* Header */
.terminal-top-bar {
  background: #111;
  padding: 10px 15px;
  border-bottom: 1px solid #333;
  display: flex;
  align-items: center;
  flex-shrink: 0; /* Prevent shrinking */
}

.traffic-lights {
  display: flex;
  gap: 8px;
  margin-right: 15px;
}
.light {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}
.light.red {
  background: #ff5f56;
}
.light.yellow {
  background: #ffbd2e;
}
.light.green {
  background: #27c93f;
}

.terminal-title {
  color: #666;
  font-size: 0.8rem;
  margin: 0 auto;
  padding-right: 40px; /* Balance the layout */
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Content */
.terminal-body {
  padding: 20px;
  color: #0f0; /* Neon Green */
  position: relative;
  min-height: 320px;
  overflow-y: auto; /* Allow scrolling if content gets too tall on tiny screens */
}

.cmd {
  color: #fff;
  margin-top: 15px;
  margin-bottom: 5px;
  font-weight: bold;
  font-size: 1rem;
}
.output {
  color: #0f0;
  line-height: 1.5;
  margin-left: 10px;
  opacity: 0.9;
  font-size: 0.95rem;
}
.output a {
  color: #fde047;
  text-decoration: none;
}
.output-dim {
  color: #008f00;
  font-size: 0.8rem;
  margin-top: 5px;
  margin-left: 10px;
}
.text-yellow {
  color: #fde047;
}

/* Blinking Status */
.status-blink {
  background: #ef4444; /* Danger Red */
  color: #000;
  padding: 2px 6px;
  font-weight: bold;
  animation: blink 1.5s infinite;
}
@keyframes blink {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* Bubbling Progress Bar */
.terminal-progress-bar {
  width: 100%;
  height: 12px;
  background: #0a200a;
  border: 1px solid #0f0;
  margin-top: 8px;
  position: relative;
  overflow: hidden;
}

.terminal-progress-fill {
  height: 100%;
  width: 25%;
  background: #0f0;
  position: relative;
  animation: liquidFlow 2s linear infinite;
}

.terminal-progress-fill::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: linear-gradient(
    45deg,
    rgba(255, 255, 255, 0.2) 25%,
    transparent 25%,
    transparent 50%,
    rgba(255, 255, 255, 0.2) 50%,
    rgba(255, 255, 255, 0.2) 75%,
    transparent 75%,
    transparent
  );
  background-size: 20px 20px;
  animation: moveStripes 1s linear infinite;
}

@keyframes moveStripes {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 20px 20px;
  }
}

/* Scanline */
.scan-line {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(0, 255, 0, 0.15);
  animation: scan 6s linear infinite;
  pointer-events: none;
}
@keyframes scan {
  0% {
    top: 0%;
  }
  100% {
    top: 100%;
  }
}

/* Buttons */
.terminal-actions-row {
  margin-top: 30px;
  display: flex;
  gap: 15px;
  border-top: 1px dashed #333;
  padding-top: 20px;
}

.terminal-btn,
.terminal-link {
  background: transparent;
  border: 1px solid #0f0;
  color: #0f0;
  padding: 12px 20px; /* Larger touch target */
  text-decoration: none;
  font-family: inherit;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1; /* Make them equal width */
}

.terminal-btn:hover,
.terminal-link:hover {
  background: #0f0;
  color: #000;
  box-shadow: 0 0 15px rgba(0, 255, 0, 0.5);
}

.terminal-footer-info {
  margin-top: 30px;
  font-size: 0.7rem;
  color: #444;
  text-align: right;
  border-top: 1px solid #111;
  padding-top: 10px;
}

.admin-only.hidden {
  display: none;
}

/* --- MOBILE SPECIFIC STYLES --- */
@media (max-width: 600px) {
  .maintenance-overlay {
    padding: 0; /* Full screen on mobile */
    align-items: flex-start; /* Start from top to handle scrolling */
  }

  .terminal-window {
    width: 100%;
    height: 100%; /* Full height */
    max-width: none;
    border-radius: 0;
    border: none;
  }

  .terminal-top-bar {
    padding: 15px; /* Bigger touch area */
  }

  .terminal-title {
    font-size: 0.75rem; /* Slightly smaller text */
  }

  .terminal-body {
    padding: 20px 15px;
    font-size: 0.9rem;
    min-height: auto; /* Let content dictate height */
    flex: 1; /* Fill remaining space */
  }

  .terminal-actions-row {
    flex-direction: column; /* Stack buttons */
    gap: 12px;
    margin-top: auto; /* Push to bottom if space permits */
    padding-bottom: 20px;
  }

  .terminal-btn,
  .terminal-link {
    width: 100%; /* Full width buttons */
    padding: 14px; /* Easier to tap */
    font-size: 1rem;
  }

  .output {
    margin-left: 0; /* More space for text */
    word-break: break-word; /* Prevent overflow */
  }
}

.btn-favorite {
  background: transparent;
  border: 1px solid #ef4444;
  color: #ef4444;
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 1.1rem;
}

.btn-favorite:hover {
  background: #fee2e2; /* Light red background on hover */
  border-color: #ef4444;
  color: #ef4444;
}

/* State when the item is actually favorited */
.btn-favorite.active {
  background: #fee2e2;
  border-color: #ef4444;
  color: #ef4444;
  transform: scale(0.98);
}

/* Adjust card actions to fit the new button */
.pdf-actions {
  display: flex;
  gap: 8px; /* Slightly tighter gap */
}

/* --- HOLIDAY GREETING CARD STYLES --- */
.holiday-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s ease;
  padding: 1rem;
}

.holiday-overlay.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

/* Background Animation Layer */
.holiday-bg-anim {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

/* The Glass Card */
.glass-card {
  background: rgba(255, 255, 255, 0.1); /* Frosted Glass */
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 24px;
  padding: 3rem 2rem;
  width: 100%;
  max-width: 450px;
  text-align: center;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  transform: scale(0.9);
  animation: popIn 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
  color: #fff;
}

@keyframes popIn {
  to {
    transform: scale(1);
  }
}

/* --- Overlay Timer (New Year) --- */
.overlay-timer {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin: 1rem 0;
  font-family: "Bangers", cursive;
  color: #ffd700; /* Gold */
  text-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
}

.overlay-timer.hidden {
  display: none !important;
}

.ot-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  line-height: 1;
}

.ot-box span {
  font-size: 2.5rem;
}

.ot-box small {
  font-family: "Inter", sans-serif;
  font-size: 0.8rem;
  opacity: 0.8;
  color: #fff;
}

.ot-sep {
  font-size: 2rem;
  margin-bottom: 10px;
  color: rgba(255, 255, 255, 0.5);
}

/* Typography & Layout */
.holiday-emoji {
  font-size: 4.5rem;
  margin-bottom: 1rem;
  filter: drop-shadow(0 5px 15px rgba(0, 0, 0, 0.2));
  animation: floatEmoji 3s ease-in-out infinite;
}

#holidayConfetti {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none; /* Let clicks pass through to the button */
  z-index: 200; /* Higher than background (1), lower than card (if needed) or higher */
}

@keyframes floatEmoji {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

#holidayTitle {
  font-family: "Bangers", cursive; /* Your fun font */
  font-size: 3rem;
  letter-spacing: 1px;
  margin-bottom: 0.5rem;
  text-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  line-height: 1.1;
}

.holiday-divider {
  width: 60px;
  height: 4px;
  background: rgba(255, 255, 255, 0.4);
  margin: 1.5rem auto;
  border-radius: 2px;
}

#holidayMessage {
  font-family: "Inter", sans-serif;
  font-size: 1.1rem;
  line-height: 1.6;
  font-weight: 500;
  margin-bottom: 1.5rem;
  color: rgba(255, 255, 255, 0.95);
}

.chem-note {
  font-family: "Inter", sans-serif;
  font-size: 0.85rem;
  font-style: italic;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 2rem;
  background: rgba(0, 0, 0, 0.2);
  display: inline-block;
  padding: 6px 12px;
  border-radius: 20px;
}

/* --- THEMES --- */

/* 1. CHRISTMAS (Elegant Green/Red) */
.holiday-overlay.christmas {
  background: radial-gradient(circle at center, #1a472a, #0d1f15);
}
.christmas .holiday-bg-anim {
  background-image: radial-gradient(white 2px, transparent 3px);
  background-size: 50px 50px;
  animation: snowFall 10s linear infinite;
  opacity: 0.5;
}
.christmas #holidayTitle {
  color: #ff6b6b;
} /* Soft Red */

/* 2. NEW YEAR (Classy Black/Gold) */
.holiday-overlay.new-year {
  background: radial-gradient(circle at center, #2c2c2c, #000);
}
.new-year .holiday-bg-anim {
  background-image: radial-gradient(#ffd700 1px, transparent 1px);
  background-size: 40px 40px;
  animation: flicker 3s infinite;
  opacity: 0.4;
}
.new-year #holidayTitle {
  color: #ffd700;
}
.new-year .holiday-close-btn {
  color: #b8860b;
}

/* 3. REPUBLIC/INDEPENDENCE (Patriotic Gradient) */
.holiday-overlay.tricolor {
  background: linear-gradient(135deg, #ff9933, #ffffff 50%, #138808);
}
.tricolor .glass-card {
  background: rgba(0, 0, 50, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.2);
}
.tricolor #holidayTitle {
  background: linear-gradient(to right, #ff9933, #fff, #138808);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.tricolor .chem-note {
  background: rgba(255, 255, 255, 0.1);
}

/* 4. HOLI (Vibrant Splash) */
.holiday-overlay.holi {
  background: #fff;
}
.holi .holiday-bg-anim {
  background:
    radial-gradient(circle at 20% 80%, #ff0055, transparent 40%),
    radial-gradient(circle at 80% 20%, #00ccff, transparent 40%),
    radial-gradient(circle at 50% 50%, #ffcc00, transparent 40%);
  opacity: 0.8;
}
.holi .glass-card {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.6);
}
.holi #holidayTitle {
  color: #fff;
  text-shadow: 2px 2px 0px rgba(0, 0, 0, 0.2);
}
.holi #holidayMessage {
  color: #fff;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}

/* 5. DIWALI (Golden Glow) */
.holiday-overlay.diwali {
  background: radial-gradient(circle, #5e0a0a, #1a0000);
}
.diwali .holiday-bg-anim {
  animation: flicker 4s infinite;
  opacity: 0.5;
}
.diwali #holidayTitle {
  color: #ffcc00;
  text-shadow: 0 0 20px rgba(255, 204, 0, 0.6);
}

/* Animations */
@keyframes snowFall {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 20px 400px;
  }
}
@keyframes flicker {
  0%,
  100% {
    opacity: 0.5;
  }
  50% {
    opacity: 0.2;
  }
}

/* Mobile */
@media (max-width: 480px) {
  .glass-card {
    padding: 2rem 1.5rem;
    width: 90%;
  }
  #holidayTitle {
    font-size: 2.5rem;
  }
}

/* Add this to style.css */
.highlight {
  background-color: #fde047; /* Yellow highlight */
  color: #000;
  padding: 0 2px;
  border-radius: 2px;
  font-weight: 600;
}

/* --- SEASONAL HEADER EFFECTS --- */
.header {
  position: sticky;
  overflow: hidden; /* Keeps particles inside header */
}

.season-particle {
  position: absolute;
  pointer-events: none; /* Click-through */
  z-index: 1;
  user-select: none;
  will-change: transform;
}

/* 1. WINTER: SNOW */
.snowflake {
  color: var(--primary-light);
  top: -20px;
  animation: snowFall linear forwards;
}
[data-theme="dark"] .snowflake {
  color: #fff;
  opacity: 0.8;
}

@keyframes snowFall {
  to {
    transform: translateY(120px) translateX(20px);
    opacity: 0;
  }
}

/* 2. SUMMER: SUN MOTES / POLLEN */
.sun-mote {
  background: var(--accent-color);
  box-shadow: 0 0 2px var(--accent-color);

  border-radius: 50%;
  bottom: -10px;
  opacity: 0.7;
  animation: heatRise linear forwards;
}

/* DARK MODE: Switch to Bright Yellow with a heavy glow */
[data-theme="dark"] .sun-mote {
  background: #fbbf24;
  box-shadow: 0 0 8px #fbbf24;
  opacity: 0.8;
}

@keyframes heatRise {
  0% {
    transform: translateY(0) translateX(0);
    opacity: 0;
  }
  20% {
    opacity: 1;
  }
  100% {
    transform: translateY(-120px) translateX(-25px);
    opacity: 0;
  }
}

/* 3. MONSOON: RAIN */
.raindrop {
  /* background: linear-gradient(to bottom, transparent, var(--primary-color));
  width: 1px;
  height: 20px;
  border-radius: 4px; */
  top: -30px;
  opacity: 0.8;
  animation: rainFall linear forwards;
  /* will-change: transform; */
}

@keyframes rainFall {
  0% {
    transform: translateY(0) translateX(0) skewX(-10deg);
    opacity: 0;
  }
  20% {
    opacity: 1;
  }
  100% {
    transform: translateY(120vh) translateX(-50px) skewX(-10deg);
    opacity: 0.2;
  }
}

/* 4. AUTUMN: LEAVES */
.autumn-leaf {
  top: -20px;
  animation: leafFall ease-in-out forwards;
}
@keyframes leafFall {
  0% {
    transform: translateY(0) rotate(0deg) translateX(0);
    opacity: 1;
  }
  25% {
    transform: translateY(30px) rotate(45deg) translateX(20px);
  }
  50% {
    transform: translateY(60px) rotate(90deg) translateX(-20px);
  }
  75% {
    transform: translateY(90px) rotate(135deg) translateX(10px);
  }
  100% {
    transform: translateY(120px) rotate(180deg) translateX(20px);
    opacity: 0;
  }
}

/* --- PRANK / EASTER EGG STYLES --- */
.prank-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: #000;
  z-index: 10000; /* Highest priority */
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Courier New", Courier, monospace;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease;
}

.prank-overlay.active {
  opacity: 1;
  visibility: visible;
}

.prank-terminal {
  width: 90%;
  max-width: 600px;
  text-align: center;
}

.prank-text {
  color: #0f0; /* Hacker Green */
  font-size: 1.2rem;
  margin-bottom: 20px;
  min-height: 60px;
  text-shadow: 0 0 5px #0f0;
}

.prank-progress-bar {
  width: 100%;
  height: 20px;
  background: #111;
  border: 1px solid #0f0;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 30px;
  box-shadow: 0 0 10px rgba(0, 255, 0, 0.2);
}

.prank-progress-fill {
  height: 100%;
  width: 0%;
  background: #0f0;
  transition: width 0.2s linear;
}

.prank-close-btn {
  background: transparent;
  border: 1px solid #fff;
  color: #fff;
  padding: 12px 24px;
  font-family: inherit;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s;
  border-radius: 4px;
}

.prank-close-btn:hover {
  background: #fff;
  color: #000;
}

.prank-close-btn.hidden {
  display: none;
}

/* --- Announcement Marquee --- */
.announcement-bar {
  background-color: var(--primary-color);
  color: white;
  font-size: 0.9rem;
  padding: 10px 0;
  position: relative;
  z-index: 1020;
  transition: all 0.3s ease;
}
.announcement-bar.hidden {
  display: none;
}
.announcement-content {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  text-align: center;
}
.announcement-bar a {
  color: white;
  text-decoration: underline;
  font-weight: 600;
}
#closeAnnouncement {
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.2rem;
  cursor: pointer;
  position: absolute;
  right: 0;
}
#closeAnnouncement:hover {
  color: white;
}
/* Overlay */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(6px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease;
}

.modal-overlay:not(.hidden) {
  opacity: 1;
  visibility: visible;
}

/* Modal Card */
.email-modal {
  position: relative;
  width: 92%;
  max-width: 420px;
  background: #ffffff;
  border-radius: 18px;
  padding: 28px 22px 26px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.25);
  text-align: center;
  animation: modalPop 0.3s ease;
}

/* Close Button */
.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: #888;
}

.modal-close:hover {
  color: #000;
}

/* Icon */
.modal-icon {
  font-size: 2.4rem;
  margin-bottom: 10px;
}

/* Text */
.modal-title {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.modal-subtitle {
  font-size: 0.95rem;
  color: #666;
  margin-bottom: 18px;
}

/* Form */
.email-form {
  display: flex;
  gap: 10px;
  flex-direction: column;
}

.email-form input {
  padding: 12px 14px;
  font-size: 0.95rem;
  border-radius: 10px;
  border: 1px solid #ddd;
  outline: none;
  transition:
    border 0.2s,
    box-shadow 0.2s;
}

.email-form input:focus {
  border-color: #2563eb;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Button */
.email-form button {
  padding: 12px;
  border-radius: 10px;
  border: none;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  color: #fff;
  font-weight: 500;
  cursor: pointer;
  transition:
    transform 0.15s ease,
    box-shadow 0.15s ease;
}

.email-form button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

/* Footer */
.modal-footer {
  font-size: 0.75rem;
  color: #999;
  margin-top: 12px;
}

/* Animation */
@keyframes modalPop {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* Responsive tweak (very small devices) */
@media (max-width: 360px) {
  .modal-title {
    font-size: 1.2rem;
  }
}

/* =========================================
   SKELETON LOADING ANIMATION
   ========================================= */
.skeleton {
  background: #e1e4e8;
  border-radius: 4px;
  position: relative;
  overflow: hidden;
}

/* Dark mode skeleton color */
[data-theme="dark"] .skeleton {
  background: #2d2d30;
}

.skeleton::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  transform: translateX(-100%);
  background-image: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0,
    rgba(255, 255, 255, 0.2) 20%,
    rgba(255, 255, 255, 0.5) 60%,
    rgba(255, 255, 255, 0)
  );
  animation: shimmer 2s infinite;
}

[data-theme="dark"] .skeleton::after {
  background-image: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0,
    rgba(255, 255, 255, 0.05) 20%,
    rgba(255, 255, 255, 0.1) 60%,
    rgba(255, 255, 255, 0)
  );
}

@keyframes shimmer {
  100% {
    transform: translateX(100%);
  }
}

/* Skeleton Card Structure */
.skeleton-card {
  background: var(--card-bg); /* Use theme card color */
  border: 1px solid var(--border-color); /* Maintain border */
  border-radius: var(--border-radius-lg);
  padding: calc(var(--spacing) * 3);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  height: 250px; /* Approximate height of a real card */
}

.skeleton-header {
  display: flex;
  gap: 1rem;
}

.skeleton-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius);
}

.skeleton-title-group {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.skeleton-title {
  height: 20px;
  width: 80%;
}

.skeleton-tag {
  height: 15px;
  width: 40%;
}

.skeleton-body {
  flex: 1;
  height: 60px;
}

.skeleton-footer {
  display: flex;
  gap: 1rem;
}

.skeleton-btn {
  height: 36px;
  flex: 1;
  border-radius: var(--border-radius);
}

/* =========================================
   NEW UPLOAD CTA STYLES
   ========================================= */
/* Header Action Group */
.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Primary Header Upload Button */
.btn-upload-header {
  background: var(--primary-color);
  color: #fff;
  padding: 0.6rem 1.2rem;
  border-radius: 50px; /* Modern pill shape */
  font-weight: 600;
  box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.39);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-size: 0.9rem;
}

.btn-upload-header:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.23);
  background: var(--primary-dark);
}

/* Community Call-to-Action Banner */
.community-cta {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--primary-dark)
  );
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  margin-bottom: 2rem;
  color: white;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.community-cta-content {
  z-index: 2;
}

.community-cta h3 {
  font-size: 1.25rem;
  margin-bottom: 0.25rem;
  color: white;
}

.community-cta p {
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.9rem;
  margin-bottom: 0;
}

.btn-cta-light {
  background: white;
  color: var(--primary-color);
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  transition: all 0.2s;
  z-index: 2;
  white-space: nowrap;
}

.btn-cta-light:hover {
  background: var(--gray-50);
  transform: scale(1.05);
}

/* Background decoration for banner */
.community-cta::before {
  content: "";
  position: absolute;
  top: -50%;
  right: -10%;
  width: 200px;
  height: 200px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}

@media (max-width: 600px) {
  .community-cta {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }

  .btn-upload-header span {
    display: none; /* Hide text on mobile header, keep icon */
  }

  .btn-upload-header {
    padding: 0.6rem;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    justify-content: center;
  }
}
/* =========================================
   REFRESHING UI UPDATES
   ========================================= */

/* 1. The Daily Catalyst (Greeting Card) */
.catalyst-card {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--primary-dark)
  );
  border-radius: var(--border-radius-lg);
  padding: 1.5rem 2rem;
  margin-bottom: 2rem;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 10px 25px -5px rgba(37, 99, 235, 0.4);
  position: relative;
  overflow: hidden;
  animation: slideDown 0.5s ease-out;
}

.catalyst-card.hidden {
  display: none;
}

/* Abstract circles decoration background */
.catalyst-card::before {
  content: "";
  position: absolute;
  top: -50px;
  right: -50px;
  width: 150px;
  height: 150px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}
.catalyst-card::after {
  content: "";
  position: absolute;
  bottom: -30px;
  left: 20px;
  width: 80px;
  height: 80px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}

.catalyst-content {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  z-index: 2;
}

.catalyst-icon {
  font-size: 2.5rem;
  background: rgba(255, 255, 255, 0.2);
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  backdrop-filter: blur(5px);
}

.catalyst-text h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: #fff;
}

.catalyst-text p {
  font-size: 0.95rem;
  opacity: 0.9;
  font-weight: 400;
  max-width: 500px;
}

.catalyst-close {
  background: rgba(0, 0, 0, 0.1);
  border: none;
  color: rgba(255, 255, 255, 0.8);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  z-index: 2;
}

.catalyst-close:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  transform: rotate(90deg);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 600px) {
  .catalyst-card {
    padding: 1.25rem;
    align-items: flex-start;
  }
  .catalyst-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  .catalyst-close {
    position: absolute;
    top: 10px;
    right: 10px;
  }
}

/* 2. Staggered Card Animation (The "Flow" Effect) */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.pdf-card {
  /* Default state for animation */
  animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
  opacity: 0; /* Hidden initially, revealed by animation */
}

/* 3. Satisfying Heart Pop Animation */
@keyframes heartPop {
  0% {
    transform: scale(1);
  }
  40% {
    transform: scale(1.4);
  }
  100% {
    transform: scale(1);
  }
}

.btn-favorite.popping i {
  animation: heartPop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.class-switcher {
  margin: 0 15px;
}

.class-switcher select {
  padding: 6px 12px;
  border-radius: var(--border-radius);
  border: 1px solid var(--gray-200);
  background: var(--background-color);
  color: var(--gray-800);
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  outline: none;
  transition: var(--transition);
}

[data-theme="dark"] .class-switcher select {
  background: var(--gray-100);
  color: var(--white);
  border-color: var(--gray-300);
}