/* ============================================
   CU Boulder Data Mining Project - Styles
   Group 1: Sam Goodell, Will Creager, Antoni Czolgowski
   ============================================ */

/* ---------- CSS Variables (CU Boulder Colors) ---------- */
:root {
  /* Primary Colors */
  --cu-gold: #CFB87C;
  --black: #000000;
  --white: #FFFFFF;
  --cu-dark-gray: #565A5C;
  --cu-light-gray: #A2A4A3;
  
  /* Secondary Colors */
  --cu-accessible-gold: #8D7334;
  --cu-sky-blue: #096FAE;
  --cu-light-gold: #F3F0E9;
  --cu-dark-blue: #0A3758;
  --cu-light-blue: #EEF5F8;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Layout */
  --max-width: 1200px;
  --border-radius: 8px;
  --border-radius-lg: 12px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--black);
  background-color: var(--white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--cu-dark-blue);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--cu-accessible-gold);
}

ul, ol {
  list-style-position: inside;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--black);
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
}

h2 {
  font-size: 2rem;
  color: var(--cu-dark-blue);
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--cu-dark-gray);
}

/* ---------- Layout Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.section {
  padding: var(--spacing-xxl) 0;
}

.section-alt {
  background-color: var(--cu-light-gold);
}

.section-blue {
  background-color: var(--cu-light-blue);
}

/* ---------- Header & Navigation ---------- */
.header {
  background-color: var(--black);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.logo-text {
  color: var(--cu-gold);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.logo-subtext {
  color: var(--cu-light-gray);
  font-size: 0.75rem;
  font-weight: 400;
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  gap: var(--spacing-xs);
}

.nav-link {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--white);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--cu-gold);
  background-color: rgba(207, 184, 124, 0.1);
}

.nav-link.active {
  color: var(--black);
  background-color: var(--cu-gold);
}

.nav-link.disabled {
  color: var(--cu-dark-gray);
  cursor: not-allowed;
  opacity: 0.6;
}

.nav-link.disabled:hover {
  background-color: transparent;
  color: var(--cu-dark-gray);
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.mobile-menu-btn span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--cu-gold);
  transition: all var(--transition-fast);
}

/* ---------- Hero Section ---------- */
.hero {
  background: linear-gradient(135deg, var(--cu-dark-blue) 0%, var(--black) 100%);
  color: var(--white);
  padding: var(--spacing-xxl) 0;
  text-align: center;
}

.hero h1 {
  color: var(--white);
  font-size: 2.75rem;
  margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
  color: var(--cu-gold);
  font-size: 1.25rem;
  font-weight: 500;
  margin-bottom: var(--spacing-md);
}

.hero p {
  color: var(--cu-light-gray);
  font-size: 1.1rem;
  max-width: 700px;
  margin: 0 auto;
}

/* ---------- Content Sections ---------- */
.content-section {
  padding: var(--spacing-xl) 0;
}

.content-section h2 {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-sm);
  border-bottom: 3px solid var(--cu-gold);
  display: inline-block;
}

.content-block {
  margin-bottom: var(--spacing-lg);
}

.content-block h3 {
  color: var(--cu-dark-blue);
  margin-bottom: var(--spacing-sm);
}

.content-block p {
  text-align: justify;
}

/* ---------- Cards ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.card {
  background-color: var(--white);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.card-header {
  background: linear-gradient(135deg, var(--cu-dark-blue) 0%, var(--black) 100%);
  padding: var(--spacing-lg);
  text-align: center;
}

.card-body {
  padding: var(--spacing-lg);
}

/* Team Cards */
.team-card {
  text-align: center;
}

.team-card .card-header {
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-lg);
}

.team-photo {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--cu-gold);
  margin: 0 auto;
  background-color: var(--cu-light-gray);
}

.team-name {
  color: var(--black);
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
  margin-top: var(--spacing-sm);
}

.team-role {
  display: inline-block;
  background-color: var(--cu-gold);
  color: var(--black);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.team-bio {
  color: var(--cu-dark-gray);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-md);
}

.team-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-sm);
}

.team-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--cu-light-gold);
  color: var(--cu-dark-blue);
  transition: all var(--transition-fast);
}

.team-links a:hover {
  background-color: var(--cu-gold);
  color: var(--black);
}

.team-links svg {
  width: 20px;
  height: 20px;
}

/* ---------- Research Questions ---------- */
.questions-list {
  counter-reset: question-counter;
  list-style: none;
}

.question-item {
  counter-increment: question-counter;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  background-color: var(--white);
  border-left: 4px solid var(--cu-gold);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  min-height: 60px;
}

.question-item:hover {
  border-left-color: var(--cu-dark-blue);
  box-shadow: var(--shadow-md);
}

.question-item::before {
  content: "Q" counter(question-counter);
  display: inline-block;
  background-color: var(--cu-dark-blue);
  color: var(--white);
  font-weight: 700;
  font-size: 0.8rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--border-radius);
  margin-right: var(--spacing-sm);
}

.question-item h4 {
  display: inline;
  font-size: 1rem;
  font-weight: 500;
  color: var(--cu-dark-gray);
}

/* ---------- Proposal Overview ---------- */
.proposal-section {
  margin-bottom: var(--spacing-xl);
}

.proposal-section h3 {
  color: var(--cu-dark-blue);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.proposal-section h3::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 24px;
  background-color: var(--cu-gold);
  border-radius: 2px;
}

.bullet-list {
  list-style: none;
  padding-left: var(--spacing-md);
}

.bullet-list li {
  position: relative;
  padding-left: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  color: var(--cu-dark-gray);
  min-height: 1.5rem;
}

.bullet-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 8px;
  height: 8px;
  background-color: var(--cu-gold);
  border-radius: 50%;
}

/* ---------- Data Sources Table ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--spacing-md);
  background-color: var(--white);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.data-table th,
.data-table td {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--cu-light-gray);
}

.data-table th {
  background-color: var(--cu-dark-blue);
  color: var(--white);
  font-weight: 600;
  font-size: 0.9rem;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background-color: var(--cu-light-gold);
}

/* ---------- Placeholder / Coming Soon ---------- */
.placeholder-content {
  text-align: center;
  padding: var(--spacing-xxl);
}

.placeholder-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.placeholder-content h2 {
  color: var(--cu-dark-gray);
  margin-bottom: var(--spacing-sm);
}

.placeholder-content p {
  color: var(--cu-light-gray);
  font-size: 1.1rem;
}

.milestone-badge {
  display: inline-block;
  background-color: var(--cu-gold);
  color: var(--black);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: var(--spacing-md);
}

/* ---------- Figure / Image Placeholders ---------- */
.figure-placeholder {
  background-color: var(--cu-light-blue);
  border: 2px dashed var(--cu-light-gray);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
  text-align: center;
  margin: var(--spacing-lg) 0;
}

.figure-placeholder p {
  color: var(--cu-dark-gray);
  font-style: italic;
}

/* ---------- Footer ---------- */
.footer {
  background-color: var(--black);
  color: var(--cu-light-gray);
  padding: var(--spacing-lg) 0;
  margin-top: auto;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.footer-text {
  font-size: 0.9rem;
}

.footer-text a {
  color: var(--cu-gold);
}

.footer-text a:hover {
  color: var(--white);
}

.footer-links {
  display: flex;
  gap: var(--spacing-md);
}

.footer-links a {
  color: var(--cu-light-gray);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--cu-gold);
}

/* ---------- Responsive Design ---------- */
@media (max-width: 768px) {
  html {
    font-size: 15px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  /* Mobile Navigation */
  .mobile-menu-btn {
    display: flex;
  }
  
  .nav-list {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background-color: var(--black);
    flex-direction: column;
    padding: var(--spacing-md);
    gap: var(--spacing-xs);
    transform: translateY(-150%);
    opacity: 0;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
  }
  
  .nav-list.active {
    transform: translateY(0);
    opacity: 1;
  }
  
  .nav-link {
    padding: var(--spacing-sm);
    text-align: center;
  }
  
  /* Stat Grid */
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat-grid-3 {
    grid-template-columns: 1fr;
  }

  .callout-grid {
    grid-template-columns: 1fr;
  }

  .pipeline-flow {
    flex-direction: column;
  }

  .pipeline-arrow {
    transform: rotate(90deg);
    padding: var(--spacing-xs) 0;
  }

  /* Cards */
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  /* Footer */
  .footer-container {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }
  
  .section {
    padding: var(--spacing-xl) 0;
  }
  
  .team-photo {
    width: 120px;
    height: 120px;
  }
}

/* ---------- Stat Grid (EDA Page) ---------- */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: linear-gradient(135deg, var(--cu-dark-blue) 0%, var(--black) 100%);
  color: var(--white);
  text-align: center;
  padding: var(--spacing-lg) var(--spacing-md);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--cu-gold);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--cu-light-gray);
  margin-top: var(--spacing-xs);
}

/* ---------- Figure Container (EDA Page) ---------- */
.figure-container {
  margin: var(--spacing-lg) 0;
  text-align: center;
}

.figure-container img {
  max-width: 100%;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-md);
  margin: 0 auto;
}

.figure-container figcaption {
  margin-top: var(--spacing-sm);
  color: var(--cu-dark-gray);
  font-size: 0.9rem;
  font-style: italic;
}

/* ---------- Data Table Extras (EDA Page) ---------- */
.table-subheader td {
  background-color: var(--cu-light-gold);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--cu-dark-blue);
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 2px solid var(--cu-gold);
}

.value-negative {
  color: #c0392b;
  font-weight: 600;
}

.value-positive {
  color: #2471a3;
  font-weight: 600;
}

.table-wrapper {
  overflow-x: auto;
  margin: var(--spacing-md) 0;
}

/* ---------- Pipeline Flow Diagram ---------- */
.pipeline-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  margin: var(--spacing-xl) 0;
  flex-wrap: wrap;
}

.pipeline-sources {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.pipeline-node {
  background: linear-gradient(135deg, var(--cu-dark-blue) 0%, var(--black) 100%);
  color: var(--white);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--border-radius);
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  box-shadow: var(--shadow-md);
  min-width: 200px;
}

.pipeline-node .node-dim {
  color: var(--cu-gold);
  font-size: 0.8rem;
  font-weight: 400;
  display: block;
  margin-top: 2px;
}

.pipeline-arrow {
  font-size: 2rem;
  color: var(--cu-gold);
  padding: 0 var(--spacing-md);
  font-weight: 700;
  line-height: 1;
}

.pipeline-result {
  background: linear-gradient(135deg, var(--cu-accessible-gold) 0%, var(--cu-gold) 100%);
  color: var(--black);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  text-align: center;
  font-weight: 700;
  font-size: 1rem;
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--cu-accessible-gold);
}

.pipeline-result .node-dim {
  color: var(--cu-dark-blue);
  font-size: 0.85rem;
  font-weight: 500;
  display: block;
  margin-top: 4px;
}

/* ---------- Callout Cards ---------- */
.callout-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.callout-card {
  background-color: var(--white);
  border-left: 4px solid var(--cu-gold);
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  box-shadow: var(--shadow-sm);
}

.callout-card h4 {
  color: var(--cu-dark-blue);
  margin-bottom: var(--spacing-xs);
  font-size: 1rem;
}

.callout-card p {
  font-size: 0.9rem;
  margin-bottom: 0;
}

.callout-tag {
  display: inline-block;
  background-color: var(--cu-dark-blue);
  color: var(--white);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-xs);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ---------- 3-Column Stat Grid ---------- */
.stat-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

/* ---------- Skewness & Tag Colors ---------- */
.skew-before {
  color: #c0392b;
  font-weight: 700;
  font-size: 1.05em;
}

.skew-after {
  color: #1a8a5c;
  font-weight: 700;
  font-size: 1.05em;
}

.tag-retained {
  display: inline-block;
  background-color: #1a8a5c;
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--border-radius);
  letter-spacing: 0.3px;
}

.tag-dropped {
  display: inline-block;
  background-color: #c0392b;
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--border-radius);
  letter-spacing: 0.3px;
}

/* ---------- Print Styles ---------- */
@media print {
  .header,
  .footer,
  .mobile-menu-btn {
    display: none;
  }
  
  body {
    font-size: 12pt;
  }
  
  .section {
    padding: 1rem 0;
  }
}