:root {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;

  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --primary-border: #bfdbfe;

  --accent: #0d9488;
  --accent-hover: #0f766e;
  --accent-light: #ccfbf1;

  --border-color: #e2e8f0;
  --code-bg: #f1f5f9;
  --code-text: #0f172a;

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

  --font-sans: 'Inter', sans-serif;
  --font-heading: 'Outfit', sans-serif;
  --font-mono: 'Fira Code', monospace;

  --sidebar-width: 320px;
}

html {
  font-size: 16px !important;
}

/* Layout overrides */
body {
  font-family: var(--font-sans) !important;
  background-color: var(--bg-primary) !important;
  color: var(--text-primary) !important;
  line-height: 1.6;
  margin: 0 !important;
  padding: 0 !important;
}

.container {
  display: flex;
  min-height: 100vh;
  position: relative;
}

/* Sidebar Navigation */
aside {
  width: var(--sidebar-width);
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: 2.5rem 1.5rem;
  overflow-y: auto;
}

.university-logo-container {
  margin-bottom: 2rem;
  text-align: center;
}

.university-logo {
  max-width: 100%;
  height: auto;
  max-height: 60px;
  object-fit: contain;
}

.thesis-meta {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 2rem;
  font-size: 0.875rem;
}

.thesis-meta h4 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.35rem;
}

.thesis-meta-item {
  margin-bottom: 0.75rem;
}

.thesis-meta-item:last-child {
  margin-bottom: 0;
}

.meta-label {
  color: var(--text-muted);
  font-weight: 500;
  display: block;
  margin-bottom: 0.15rem;
}

.meta-value {
  font-weight: 600;
  color: var(--text-secondary);
}

.meta-value a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Navigation Links */
nav {
  flex-grow: 1;
}

nav h5 {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  margin-top: 1rem;
}

nav ul {
  list-style-type: none;
}

nav li {
  margin-bottom: 0.5rem;
}

nav a {
  display: block;
  padding: 0.6rem 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.925rem;
  font-weight: 500;
  transition: all 0.2s ease;
}

nav a:hover,
nav a.active {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.sub-nav {
  list-style-type: none;
  padding-left: 1rem;
  margin-top: 0.25rem;
  margin-bottom: 0.5rem;
  border-left: 1px solid var(--border-color);
}

.sub-nav li {
  margin-bottom: 0.25rem;
}

.sub-nav a {
  padding: 0.3rem 0.5rem;
  font-size: 0.825rem;
  font-weight: 400;
  color: var(--text-muted);
  border-radius: 4px;
}

.sub-nav a:hover,
.sub-nav a.active {
  color: var(--primary);
  background: none;
  font-weight: 600;
}

/* Main Content Area */
main {
  margin-left: var(--sidebar-width);
  flex-grow: 1;
  padding: 3rem 4rem;
  max-width: 1200px;
  background-color: var(--bg-primary);
  min-height: 100vh;
}

/* Overriding bootstrap container class inside main */
main .container-fluid,
main .container-fluid.main-container {
  padding-left: 0 !important;
  padding-right: 0 !important;
  margin-left: 0 !important;
  margin-right: 0 !important;
  max-width: 100% !important;
  width: 100% !important;
  background-color: transparent !important;
}

/* Headings & Text Overrides */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading) !important;
  color: var(--text-primary) !important;
  font-weight: 700 !important;
}

h1.title {
  font-size: 2.75rem !important;
  font-weight: 800 !important;
  letter-spacing: -0.03em !important;
  margin-bottom: 0.5rem !important;
  margin-top: 1rem !important;
  border: none !important;
}

h4.author {
  font-size: 1.1rem !important;
  font-weight: 500 !important;
  color: var(--text-secondary) !important;
  margin-bottom: 2rem !important;
}

h1:not(.title) {
  font-size: 2.25rem !important;
  border-bottom: 1px solid var(--border-color) !important;
  padding-bottom: 0.75rem !important;
  margin-top: 3rem !important;
  margin-bottom: 1.5rem !important;
  font-weight: 800 !important;
  letter-spacing: -0.02em !important;
}

h2 {
  font-size: 1.65rem !important;
  margin-top: 2.5rem !important;
  margin-bottom: 1.25rem !important;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

h2::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 1.4rem;
  background-color: var(--primary);
  border-radius: 2px;
}

h3 {
  font-size: 1.3rem !important;
  margin-top: 2rem !important;
  margin-bottom: 1rem !important;
  color: var(--text-primary) !important;
}

p {
  font-family: var(--font-sans) !important;
  font-size: 1rem !important;
  color: var(--text-secondary) !important;
  line-height: 1.7 !important;
  margin-bottom: 1.25rem !important;
  max-width: 80ch !important;
}

ul, ol {
  font-family: var(--font-sans) !important;
  color: var(--text-secondary) !important;
  line-height: 1.7 !important;
  margin-bottom: 1.5rem !important;
}

/* R Code chunks and folding button */
.code-folding-btn,
.rmd-btn-code-container .btn {
  background-color: var(--primary-light) !important;
  color: var(--primary) !important;
  border: 1px solid var(--primary-border) !important;
  border-radius: 9999px !important;
  padding: 0.35rem 1rem !important;
  font-family: var(--font-sans) !important;
  font-weight: 600 !important;
  font-size: 0.8rem !important;
  transition: all 0.2s ease !important;
  box-shadow: var(--shadow-sm) !important;
}

.code-folding-btn:hover,
.rmd-btn-code-container .btn:hover {
  background-color: var(--primary) !important;
  color: #ffffff !important;
  border-color: var(--primary-hover) !important;
}

.dropdown-menu {
  background-color: var(--bg-secondary) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 12px !important;
  box-shadow: var(--shadow-lg) !important;
  padding: 0.5rem 0 !important;
  margin-top: 4px !important;
}

.dropdown-menu > li > a {
  color: var(--text-secondary) !important;
  font-family: var(--font-sans) !important;
  font-size: 0.875rem !important;
  padding: 0.6rem 1.5rem !important;
  transition: all 0.2s ease !important;
}

.dropdown-menu > li > a:hover {
  background-color: var(--primary-light) !important;
  color: var(--primary) !important;
}

pre, .markdown pre {
  background-color: #0f172a !important;
  color: #f8fafc !important;
  border: 1px solid #1e293b !important;
  border-radius: 12px !important;
  padding: 1.25rem !important;
  font-family: var(--font-mono) !important;
  overflow-x: auto !important;
  margin-bottom: 1.5rem !important;
  box-shadow: var(--shadow-md) !important;
}

pre code, code {
  font-family: var(--font-mono) !important;
}

pre code {
  background-color: transparent !important;
  color: inherit !important;
  padding: 0 !important;
}

code:not(pre code) {
  background-color: var(--code-bg) !important;
  color: var(--code-text) !important;
  padding: 0.2rem 0.4rem !important;
  border-radius: 6px !important;
  font-size: 0.875em !important;
  font-weight: 500 !important;
}

/* Tables styling */
table.table, table {
  width: 100% !important;
  border-collapse: collapse !important;
  margin: 2rem 0 !important;
  background-color: var(--bg-secondary) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 12px !important;
  overflow: hidden !important;
  box-shadow: var(--shadow-sm) !important;
}

table th, th {
  background-color: var(--bg-primary) !important;
  color: var(--text-primary) !important;
  font-weight: 600 !important;
  padding: 0.85rem 1.25rem !important;
  border-bottom: 2px solid var(--border-color) !important;
  font-family: var(--font-heading) !important;
  font-size: 0.95rem !important;
}

table td, td {
  padding: 0.85rem 1.25rem !important;
  border-bottom: 1px solid var(--border-color) !important;
  color: var(--text-secondary) !important;
  font-family: var(--font-sans) !important;
  font-size: 0.9rem !important;
}

table tr:last-child td, tr:last-child td {
  border-bottom: none !important;
}

table tr:hover td, tr:hover td {
  background-color: var(--primary-light) !important;
}

/* Plots & Images styling */
p img, img[role="img"] {
  max-width: 100% !important;
  height: auto !important;
  display: block !important;
  margin: 2rem auto !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 12px !important;
  box-shadow: var(--shadow-md) !important;
  background-color: var(--bg-secondary) !important;
  padding: 0.5rem !important;
}

/* Math equations */
.math.display {
  background-color: var(--bg-secondary) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 12px !important;
  padding: 1.5rem !important;
  margin: 1.5rem 0 !important;
  overflow-x: auto !important;
  box-shadow: var(--shadow-sm) !important;
}

/* Responsive designs */
@media (max-width: 1024px) {
  aside {
    width: 100%;
    position: relative;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding: 2rem;
  }

  main {
    margin-left: 0;
    padding: 2rem;
  }

  .container {
    flex-direction: column;
  }
}