/* Data Science Course - Color Scheme from Logo */

:root {
  /* Primary Colors from Logo */
  --bright-cyan: #40C9D9;
  --deep-blue: #2563C7;
  --coral-pink: #FF6B6B;
  --salmon-coral: #FF7B7C;
  --turquoise: #4DD4E5;
  --navy-blue: #1A4B9E;
  --soft-pink: #FFB8B8;
  --star-accent: #FF5A7C;
  
  /* Supporting Colors */
  --light-bg: #F8FCFF;
  --white: #FFFFFF;
  --dark-text: #1A1A1A;
  --grey-text: #555555;
  --light-grey: #E8F4F8;
}

/* Body and Background - Gradient inspired by logo */
body {
  background: linear-gradient(135deg, var(--bright-cyan) 0%, var(--turquoise) 30%, var(--deep-blue) 100%);
  min-height: 100vh;
  color: var(--dark-text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

/* Main content area - Clean white card effect */
.quarto-container {
  background: rgba(255, 255, 255, 0.97);
  border-radius: 20px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  backdrop-filter: blur(10px);
  margin: 20px;
  padding: 40px;
  border: 2px solid rgba(255, 255, 255, 0.5);
}

/* Navigation Bar - Vibrant gradient from logo colors */
.navbar {
  background: linear-gradient(90deg, var(--bright-cyan) 0%, var(--turquoise) 50%, var(--coral-pink) 100%) !important;
  border-bottom: 4px solid var(--star-accent);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  padding: 1rem 2rem;
}

.navbar-brand {
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--navy-blue) !important;
  transition: all 0.3s ease;
}

.navbar-brand:hover {
  color: var(--white) !important;
  transform: scale(1.05);
}

.navbar-brand img {
  height: 45px;
  margin-right: 12px;
  filter: drop-shadow(2px 2px 4px rgba(0, 0, 0, 0.2));
}

.nav-link {
  color: var(--navy-blue) !important;
  font-weight: 600;
  font-size: 1.05rem;
  transition: all 0.3s ease;
  padding: 0.5rem 1rem !important;
  border-radius: 8px;
  margin: 0 0.2rem;
}

.nav-link:hover {
  color: var(--white) !important;
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.nav-link.active {
  background: rgba(255, 255, 255, 0.3);
  color: var(--white) !important;
}

/* Headings - Colorful and distinctive */
h1 {
  color: var(--deep-blue);
  font-weight: 800;
  margin-bottom: 30px;
  padding-bottom: 15px;
  border-bottom: 4px solid var(--coral-pink);
  position: relative;
}

h1::before {
  content: '✨';
  margin-right: 10px;
  font-size: 0.9em;
}

h2 {
  color: var(--navy-blue);
  border-left: 6px solid var(--bright-cyan);
  padding-left: 20px;
  background: linear-gradient(90deg, rgba(64, 201, 217, 0.1), transparent);
  padding: 15px 20px;
  border-radius: 8px;
  margin-top: 30px;
  margin-bottom: 20px;
  font-weight: 700;
}

h3 {
  color: var(--coral-pink);
  position: relative;
  padding-bottom: 10px;
  margin-top: 25px;
  font-weight: 600;
}

h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, var(--coral-pink), var(--salmon-coral));
  border-radius: 2px;
}

h4 {
  color: var(--navy-blue);
  font-weight: 600;
  margin-top: 20px;
}

/* Links - Colorful and interactive */
a {
  color: var(--deep-blue);
  text-decoration: none;
  transition: all 0.3s ease;
  font-weight: 500;
  position: relative;
}

a:hover {
  color: var(--coral-pink);
  text-decoration: none;
}

a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -2px;
  left: 0;
  background: var(--coral-pink);
  transition: width 0.3s ease;
}

a:hover::after {
  width: 100%;
}

/* Code blocks - Themed styling */
pre {
  background: var(--light-grey) !important;
  border-left: 5px solid var(--bright-cyan);
  border-radius: 10px;
  padding: 20px !important;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

code {
  background: rgba(64, 201, 217, 0.1);
  color: var(--navy-blue);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
}

pre code {
  background: transparent;
  padding: 0;
}

/* Buttons and Interactive Elements */
.btn, button {
  background: linear-gradient(135deg, var(--coral-pink), var(--salmon-coral));
  color: white;
  border: none;
  padding: 10px 24px;
  border-radius: 25px;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.btn:hover, button:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
  background: linear-gradient(135deg, var(--salmon-coral), var(--star-accent));
}

/* Cards and Listings */
.quarto-listing-default .listing-item {
  background: white;
  border: 2px solid var(--light-grey);
  border-radius: 15px;
  padding: 25px;
  margin-bottom: 20px;
  transition: all 0.3s ease;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.quarto-listing-default .listing-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(64, 201, 217, 0.3);
  border-color: var(--bright-cyan);
}

/* Table of Contents */
.sidebar nav[role="doc-toc"] {
  background: var(--light-bg);
  border-radius: 15px;
  padding: 20px;
  border: 2px solid var(--light-grey);
}

.sidebar nav[role="doc-toc"] .active {
  color: var(--coral-pink) !important;
  font-weight: 700;
  border-left: 3px solid var(--coral-pink);
  padding-left: 10px;
}

/* Blockquotes - Accent style */
blockquote {
  border-left: 6px solid var(--coral-pink);
  background: rgba(255, 107, 107, 0.05);
  padding: 20px 25px;
  margin: 25px 0;
  border-radius: 8px;
  font-style: italic;
  color: var(--grey-text);
}

/* Tables - Clean and colorful */
table {
  border-collapse: separate;
  border-spacing: 0;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
}

thead {
  background: linear-gradient(135deg, var(--bright-cyan), var(--turquoise));
  color: white;
}

thead th {
  padding: 15px;
  font-weight: 700;
  text-align: left;
}

tbody tr {
  transition: all 0.2s ease;
}

tbody tr:nth-child(even) {
  background: var(--light-bg);
}

tbody tr:hover {
  background: rgba(64, 201, 217, 0.1);
  transform: scale(1.01);
}

tbody td {
  padding: 12px 15px;
  border-bottom: 1px solid var(--light-grey);
}

/* Special callout boxes */
.callout {
  border-radius: 12px;
  padding: 20px;
  margin: 20px 0;
  border-left: 6px solid;
}

.callout-note {
  background: rgba(64, 201, 217, 0.1);
  border-left-color: var(--bright-cyan);
}

.callout-warning {
  background: rgba(255, 184, 184, 0.15);
  border-left-color: var(--coral-pink);
}

.callout-tip {
  background: rgba(77, 212, 229, 0.1);
  border-left-color: var(--turquoise);
}

/* Footer */
footer {
  background: linear-gradient(90deg, var(--navy-blue), var(--deep-blue));
  color: white;
  padding: 30px;
  text-align: center;
  border-top: 4px solid var(--coral-pink);
  margin-top: 50px;
}

/* Decorative elements - Stars from logo */
.star-decoration::before,
.star-decoration::after {
  content: '✨';
  color: var(--star-accent);
  font-size: 1.2em;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .quarto-container {
    margin: 10px;
    padding: 20px;
  }
  
  .navbar {
    padding: 0.5rem 1rem;
  }
  
  h1 {
    font-size: 1.8rem;
  }
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.quarto-container {
  animation: fadeIn 0.6s ease-out;
}

/* Python/R code specific styling */
.sourceCode .kw { color: var(--deep-blue); font-weight: bold; }
.sourceCode .dt { color: var(--coral-pink); }
.sourceCode .st { color: var(--turquoise); }
.sourceCode .co { color: var(--grey-text); font-style: italic; }