:root {
  /* Primary Colors from MUI Theme */
  --primary-color: #9C27B0;
  --primary-dark: #7B1FA2;
  --primary-light: #BA68C8;
  --primary-lighter: #F9D5FF;

  /* Secondary Colors */
  --secondary-color: #2682DD;
  --secondary-light: #62AAF2;
  --secondary-dark: #1571CD;

  /* Accent Colors */
  --accent-color: #38b2ac;

  /* Semantic Colors */
  --success-color: #4CAF50;
  --success-light: #13C31C;
  --success-dark: #2E7D32;
  --warning-color: #EF6C00;
  --warning-light: #FF9800;
  --error-color: #D32F2F;
  --error-light: #EF5350;
  --info-color: #0288D1;
  --info-light: #E5F6FD;

  /* Text Colors */
  --text-primary: #45474C;
  --text-secondary: #ACB1C6;
  --text-disabled: #00000061;

  /* Background Colors */
  --background-default: #F4F6F9;
  --background-paper: #ffffff;

  /* Neutral Colors */
  --dark-color: #1a202c;
  --light-color: #F4F6F9;
  --body-color: #45474C;
  --border-color: #F9D5FF;

  /* Sidebar */
  --sidebar-bg: #ffffff;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0px 4px 25px #C3C3C340;
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

  /* Border Radius */
  --border-radius: 0.5rem;
  --border-radius-lg: 0.75rem;

  /* Component Specific */
  --chip-background: #C9E4FF;
  --progressbar-background: #C7D3EB;
  --paper-hover-background: #E3F2FD;
}

body {
  color: var(--body-color);
  background-color: var(--background-default);
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  letter-spacing: 0.5px;
}

a {
  text-decoration: none;
  color: var(--primary-color);
}

a:hover {
  color: var(--primary-dark);
}

/* Header Styles */
.header {
  background: var(--primary-color);
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  box-shadow: var(--shadow-md);
}

.header .container-fluid {
  padding: 1.75rem 3rem;
}

.header .row {
  align-items: center;
}

.header .logo {
  color: #fff;
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  letter-spacing: -0.5px;
  text-decoration: none;
}

.header .logo:hover {
  color: #fff;
  text-decoration: none;
}

.header .search-form {
  margin: 0 1rem 0 0;
}

.header .search-form .form-control {
  background: rgba(255, 255, 255, 0.95);
  border: 2px solid rgba(255, 255, 255, 0.3);
  padding: 0.625rem 1.25rem;
}

.header .search-form .form-control:focus {
  background: #fff;
  box-shadow: 0 0 0 0.3rem rgba(156, 39, 176, 0.3);
  border-color: #fff;
}

.header .btn-info {
  background: var(--secondary-color);
  border: 2px solid var(--secondary-color);
  color: #fff;
  padding: 0.625rem 1.5rem;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.header .btn-info:hover {
  background: var(--secondary-dark);
  border-color: var(--secondary-dark);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.header .dropdown-toggle {
  padding: 0.625rem 1.5rem;
}

/* Menu/Sidebar Styles */
.menu {
  padding: 1.5rem;
  margin: 0;
  list-style: none;
  background: var(--sidebar-bg);
}

.menu .pages {
  padding: 0;
  margin: 0.5rem 0 0 1.25rem;
  list-style: none;
}

.menu li {
  line-height: 1.75rem;
  margin: 0.375rem 0;
}

.menu .category {
  margin-bottom: 2rem;
  padding: 1rem;
  background: var(--light-color);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background 0.2s ease;
}

.menu .category.active,
.menu .category:hover {
  background: var(--paper-hover-background);
}

.menu .category:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
}

.menu .category-title {
  padding: 0.5rem 0.75rem;
  background: transparent;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.menu .category-title > a {
  color: var(--dark-color);
}

.menu .category-title > a:hover {
  color: var(--primary-color);
}

.menu .category.active .category-title {
  background: var(--primary-lighter);
  color: var(--primary-dark);
  border-left: 3px solid var(--primary-dark);
}

.menu .category.active .category-title > a {
  color: var(--primary-dark);
  font-weight: 800;
}

.menu .page {
  margin: 0.25rem 0;
}

.menu .page a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--body-color);
  font-weight: 500;
  border-left: 3px solid transparent;
}

.menu .page:hover a {
  background: #fff;
  color: var(--primary-color);
  border-left-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}

.menu .page.active > a {
  background: var(--primary-color);
  color: #fff;
  font-weight: 600;
  border-left-color: var(--primary-dark);
  box-shadow: var(--shadow-sm);
}

#newCategory {
  margin-bottom: 1rem;
  padding: 0.625rem 1rem;
  border: 2px solid var(--primary-light);
  background: #fff;
}

#newCategory:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.25rem rgba(156, 39, 176, 0.25);
}

/* Jumbotron/Hero Section */
.jumbotron {
  padding: 4rem 2rem;
  margin-bottom: 3rem;
  background: linear-gradient(135deg, var(--primary-lighter) 0%, var(--info-light) 100%);
}

.jumbotron .search-form .form-control {
  padding: calc(1rem - 1px) 1.5rem;
  border: 2px solid var(--primary-color);
  border-right: none;
}

#login-username {
  color: var(--light-color);
}

#home-search {
  border-radius: 0.375rem 0 0 0.375rem;
}

.jumbotron .search-form .form-control:focus {
  box-shadow: 0 0 0 0.3rem rgba(156, 39, 176, 0.25);
  border-color: var(--primary-color);
}

.jumbotron .search-form .btn {
  padding: calc(1rem - 1px) 2.5rem;
  font-weight: 600;
  background: var(--primary-color);
  border: 2px solid var(--primary-color);
  color: #fff;
  letter-spacing: 0.5px;
  border-radius: 0 0.375rem 0.375rem 0;
}

.jumbotron .search-form .btn:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.page-home .header .search-form {
  display: none;
}

/* Home Categories Grid */
.home-categories {
  column-count: 1;
  column-gap: 2rem;
  margin: 0;
}

@media (min-width: 768px) {
  .home-categories {
    column-count: 2;
  }
}

@media (min-width: 1200px) {
  .home-categories {
    column-count: 3;
  }
}

.home-categories .col {
  break-inside: avoid;
  display: inline-block;
  width: 100%;
  margin-bottom: 2rem;
}

.home-categories .card {
  background: #fff;
  border: 1px solid var(--primary-color);
  border-radius: var(--border-radius);
  height: 100%;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.home-categories .card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  transition: all 0.2s ease;
}

.home-categories .card-heading {
  margin: 0;
  padding: 1.25rem 1.5rem;
  font-weight: 700;
  color: #fff;
  background: var(--primary-color);
  letter-spacing: -0.3px;
}

.home-categories .list-group {
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  border-radius: 0;
}

.home-categories a.list-group-item {
  display: block;
  border: none;
  border-left: 3px solid transparent;
  border-radius: 0;
  padding: 0.875rem 1.25rem;
  margin: 0.25rem 0;
  background: transparent;
  color: var(--body-color);
  font-weight: 500;
  text-decoration: none;
}

.home-categories a.list-group-item:hover {
  background: var(--primary-lighter);
  border-left-color: var(--primary-color);
  padding-left: 1.5rem;
  color: var(--primary-dark);
  text-decoration: none;
  transition: all 0.2s ease;
}

.home-categories .sub-page-link {
  color: var(--body-color);
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  display: block;
}

.home-categories .sub-page-link:hover {
  background: var(--primary-lighter);
  color: var(--primary-dark);
  padding-left: 1rem;
}

/* Content Styles */
.content {
  padding: 2.5rem;
  margin: 2rem 0;
  background: #fff;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}

.content .title {
  margin: 0 0 2rem 0;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border-color);
  color: var(--dark-color);
  font-weight: 700;
  font-size: 2rem;
}

.content h1,
.content h2,
.content h3,
.content h4,
.content h5,
.content h6 {
  color: var(--dark-color);
  margin-top: 2.5rem;
  margin-bottom: 1.25rem;
  font-weight: 700;
}

.content h1 {
  font-size: 3rem;
  line-height: 112px;
  letter-spacing: -1.5px;
  font-weight: 300;
}

.content h2 {
  font-size: 2.5rem;
  line-height: 72px;
  letter-spacing: -0.5px;
  font-weight: 300;
}

.content h3 {
  font-size: 2rem;
  line-height: 56px;
  letter-spacing: 0px;
  font-weight: 400;
}

.content h4 {
  font-size: 1.75rem;
  line-height: 40px;
  letter-spacing: 0.25px;
  font-weight: 400;
}

.content h5 {
  font-size: 1.5rem;
  line-height: 32px;
  letter-spacing: 0px;
  font-weight: 400;
}

.content h6 {
  font-size: 1.25rem;
  line-height: 28px;
  letter-spacing: 0.15px;
  font-weight: 500;
}

.content ol,
.content p,
.content ul {
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.content img {
  display: block;
  height: auto;
  max-width: 100%;
  margin: 2rem auto;
  border-radius: var(--border-radius);
}

.content embed,
.content iframe,
.content object,
.content video {
  max-width: 100%;
  height: auto;
}

.content iframe[src*="vimeo"],
.content iframe[src*="youtube"] {
  width: 100%;
  aspect-ratio: 16/9;
  height: auto;
}

.content code {
  padding: 0.25rem 0.5rem;
  background: var(--primary-lighter);
  color: var(--primary-dark);
  font-weight: 600;
  border-radius: 4px;
}

.content pre {
  background: var(--light-color);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--primary-color);
  padding: 1.5rem;
  overflow-x: auto;
  border-radius: var(--border-radius);
}

.content pre code {
  background: transparent;
  color: var(--dark-color);
  padding: 0;
  font-weight: 400;
}

.content blockquote {
  border-left: 3px solid var(--primary-color);
  margin: 2rem 0;
  font-style: italic;
  color: var(--body-color);
  background: var(--light-color);
  padding: 1.25rem 1.5rem;
  border-radius: var(--border-radius);
}

.content table {
  width: 100%;
  margin-bottom: 2rem;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: var(--border-radius);
}

.content table td,
.content table th {
  padding: 1rem;
  border: 1px solid var(--border-color);
}

.content table th {
  background: var(--primary-color);
  font-weight: 700;
  color: #fff;
  text-align: left;
}

.content table tr:nth-child(even) {
  background: var(--light-color);
}

.content .page-meta {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--border-color);
  color: var(--text-secondary);
}

.content .page-meta a {
  color: var(--primary-color);
  font-weight: 600;
  border-bottom: 2px dotted var(--primary-color);
}

.content .page-meta a:hover {
  color: var(--primary-dark);
  border-bottom-style: solid;
  text-decoration: none;
}

/* Button Styles */
.btn {
  padding: 0.75rem 1.75rem;
  font-weight: 600;
  border: 2px solid transparent;
  letter-spacing: 0.75px;
  text-transform: uppercase;
  border-radius: var(--border-radius);
  transition: all 0.2s ease;
}

.btn:hover {
  box-shadow: var(--shadow-sm);
}

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

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

.btn-secondary {
  background: var(--secondary-color);
  border-color: var(--secondary-color);
  color: #fff;
}

.btn-secondary:hover {
  background: var(--secondary-dark);
  border-color: var(--secondary-dark);
}

.btn-success {
  background: var(--success-color);
  border-color: var(--success-color);
  color: #fff;
}

.btn-success:hover {
  background: var(--success-dark);
  border-color: var(--success-dark);
}

.btn-info {
  background: var(--info-color);
  border-color: var(--info-color);
  color: #fff;
}

.btn-warning {
  background: var(--warning-color);
  border-color: var(--warning-color);
  color: #fff;
}

.btn-danger {
  background: var(--error-color);
  border-color: var(--error-color);
  color: #fff;
}

.btn-group .btn {
  margin: 0 0.375rem;
}

.btn-group-sm .btn {
  padding: 0.625rem 1.25rem;
}

/* Footer Styles */
.footer {
  margin-top: 5rem;
  background: var(--primary-dark);
  color: #fff;
  position: relative;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
}

.footer-content {
  text-align: center;
  padding: 2rem 0;
}

.footer-text {
  margin: 0;
  line-height: 1.6;
  color: #fff;
  font-weight: 500;
}

.footer-text a {
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px dotted rgba(255, 255, 255, 0.5);
}

.footer-text a:hover {
  border-bottom-style: solid;
  border-bottom-color: #fff;
}

.footer-text .separator {
  margin: 0 0.2rem;
  color: rgba(255, 255, 255, 0.5);
}

@media (max-width: 768px) {
  .footer {
    padding: 0;
  }
  .footer-text .separator {
    display: inline;
    margin: 0 0.5rem;
  }
}

/* Search Results */
.search a.page {
  display: block;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  background: #fff;
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--primary-color);
  text-decoration: none;
  color: inherit;
  border-radius: var(--border-radius);
  transition: all 0.2s ease;
}

.search a.page:hover {
  border-left-color: var(--primary-dark);
  background: var(--paper-hover-background);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
}

.search .page-title {
  margin: 0 0 1rem 0;
  font-weight: 700;
  color: var(--dark-color);
}

.search .page-excerpt {
  color: var(--body-color);
  line-height: 1.7;
}

.search .search-query {
  background: var(--warning-light);
  padding: 0.125rem 0.25rem;
  font-weight: 600;
  color: var(--primary-dark);
  border-radius: 3px;
}

/* Error Page */
.error {
  padding: 4rem;
  text-align: center;
}

.error h1 {
  font-weight: 800;
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.error p {
  color: var(--body-color);
  font-weight: 500;
}

/* Modal Styles */
.modal-content {
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  border-radius: var(--border-radius-lg);
}

.modal-header {
  background: var(--primary-color);
  color: #fff;
  padding: 1.5rem;
}

.modal-title {
  font-weight: 700;
}

.modal-footer {
  border-top: 2px solid var(--border-color);
  padding: 1.25rem;
}

.modal-footer .btn {
  min-width: 120px;
}

/* Form Styles */
.form-control,
.form-select {
  border: 2px solid var(--border-color);
  padding: 0.75rem 1rem;
  border-radius: var(--border-radius);
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.3rem rgba(156, 39, 176, 0.25);
}

.form-label {
  font-weight: 600;
  color: var(--dark-color);
  margin-bottom: 0.625rem;
}

.dropdown-toggle::after {
  margin-left: 0.625rem;
}

/* Editor Styles */
.entry-markdown {
  min-height: 500px;
  font-family: "Courier New", monospace;
  line-height: 1.6;
  padding: 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
}

.entry-markdown:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.3rem rgba(156, 39, 176, 0.25);
  outline: 0;
}

.entry-preview-content {
  padding: 1.5rem;
  min-height: 500px;
}

.entry-word-count {
  color: var(--text-secondary);
  font-weight: 600;
  margin-bottom: 1rem;
}

.content .btn-group {
  margin-bottom: 1.5rem;
}

/* Responsive Styles */
@media (max-width: 768px) {
  .header .container-fluid {
    padding: 1.25rem 1.5rem;
  }
  .content {
    padding: 2rem;
    margin: 1.5rem 0;
  }
  .menu {
    margin: 1.5rem 0;
    padding: 1rem;
  }
  .jumbotron {
    padding: 3rem 1.5rem;
  }
  .home-categories {
    margin: 0;
  }
  .btn {
    padding: 0.625rem 1.5rem;
  }
}

@media (max-width: 576px) {
  .header #search-and-login {
    margin-top: 1rem;
  }
  .header .search-form {
    width: 100%;
    margin-bottom: 0.75rem;
  }
  .header .btn-info {
    width: 100%;
    margin-top: 0.5rem;
  }
  .content {
    padding: 1.5rem;
  }
  .jumbotron .search-form .btn {
    padding: 0.875rem 1.5rem;
  }
  .menu .page a {
    padding: 0.4rem 0.75rem;
  }
}

/* Scrollbar Styles */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--light-color);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-light);
  border-radius: var(--border-radius);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}

/* Additional Components */
.add-page {
  margin-left: auto;
  flex-shrink: 0;
}

.add-page span {
  font-weight: 700;
  cursor: pointer;
}

/* Alert/Status Styles */
.alert-success {
  background-color: #D1FFDE;
  border-color: #34A853;
  color: #34A853;
}

.alert-danger {
  background-color: #FDECEA;
  border-color: #D93025;
  color: #D93025;
}

.alert-warning {
  background-color: #FFF3CD;
  border-color: var(--warning-color);
  color: var(--warning-color);
}

.alert-info {
  background-color: var(--info-light);
  border-color: var(--info-color);
  color: var(--info-color);
}

/* Chip/Badge Styles */
.badge,
.chip {
  background: var(--chip-background);
  color: var(--primary-dark);
  padding: 0.375rem 0.75rem;
  border-radius: 1rem;
  font-weight: 600;
  font-size: 0.875rem;
}

.badge-primary {
  background: var(--primary-color);
  color: #fff;
}

.badge-success {
  background: var(--success-color);
  color: #fff;
}

.badge-warning {
  background: var(--warning-color);
  color: #fff;
}

.badge-danger {
  background: var(--error-color);
  color: #fff;
}

/* Progress Bar */
.progress {
  background-color: var(--progressbar-background);
  border-radius: var(--border-radius);
}

.progress-bar {
  background-color: var(--primary-color);
}

/* Card Component */
.card {
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
}

.card:hover {
  box-shadow: var(--shadow-md);
}