:root {
  --cka-primary: #6a0dad;
  --cka-secondary: #a73fd8;
  --cka-accent: #f0e6ff;
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-accent: #f3f4f6;
  --border-subtle: #e5e7eb;
  --border-emphasis: #d1d5db;
  --warning-bg: #fffcf0;
  --warning-border: #fef3c7;
  --warning-red: #dc2626;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius-lg: 12px;
  --radius-md: 8px;
  --radius-sm: 4px;
  --sidebar-width: 280px;
  --max-width: 1400px;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  
  /* Shared Semantic Colors */
  --primary: #6366f1;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
}

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

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.6;
  font-size: 16px;
}

h1, h2, h3, h4 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

a {
  color: var(--cka-primary);
  text-decoration: none;
  transition: all 0.2s ease;
}

a:hover {
  color: var(--cka-secondary);
}

.warning-banner {
  background-color: var(--warning-bg);
  border: 1px solid var(--warning-border);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 24px;
  color: #92400e;
  font-size: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.warning-banner i {
  color: var(--warning-red);
  font-size: 18px;
}

.site-wrapper {
  display: flex;
  min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar-nav {
  width: var(--sidebar-width);
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  padding: 32px 24px;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-size: 20px;
  margin-bottom: 32px;
}

.logo-mark {
  background-color: var(--cka-primary);
  color: white;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 16px;
}

.side-nav h3 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin: 24px 0 12px;
}

.side-nav ul {
  list-style: none;
}

.side-nav .nav-link {
  display: block;
  padding: 8px 12px;
  color: var(--text-secondary);
  font-size: 16px;
  font-weight: 500;
  border-radius: var(--radius-sm);
  margin-bottom: 4px;
}

.side-nav .nav-link:hover, .side-nav .nav-link.is-active {
  background-color: var(--bg-accent);
  color: var(--cka-primary);
}

.sidebar-footer {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border-subtle);
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 12px;
}

/* Main Content Area */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
}

.article-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 60px 40px 100px;
}

.article-header {
  margin-bottom: 48px;
}

.date-tag {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.date-tag span {
  font-size: 13px;
  color: var(--text-muted);
}

.date-tag .tag {
  background-color: var(--cka-primary);
  color: white;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.article-title {
  font-size: 42px;
  margin-bottom: 24px;
}

.authors {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.affiliations {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.article-abstract {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-secondary);
  padding: 24px;
  background-color: var(--bg-secondary);
  border-left: 4px solid var(--cka-primary);
  border-radius: var(--radius-sm);
  margin: 32px 0;
}

.project-links {
  display: flex;
  gap: 12px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  background-color: var(--bg-accent);
  color: var(--text-primary);
}

.project-link.primary {
  background-color: var(--cka-primary);
  color: white;
}

.project-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Sections */
.content-section {
  margin-top: 64px;
}

.section-title {
  font-size: 30px;
  border-bottom: 2px solid var(--cka-primary);
  padding-bottom: 8px;
  margin-bottom: 24px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

/* Highlights Grid */
.highlights-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 32px 0;
}

.highlight-card {
  padding: 24px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
}

.highlight-card:hover {
  border-color: var(--cka-primary);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.highlight-icon {
  font-size: 32px;
  margin-bottom: 16px;
}

.highlight-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--cka-primary);
}

.highlight-card p {
  font-size: 16px;
  color: var(--text-secondary);
}

/* Figure Container */
.figure-container {
  margin: 48px 0;
  text-align: center;
}

.motion-iframe {
  width: 100%;
  height: 900px;
  min-height: 420px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.figure-img {
  width: 100%;
  max-width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow-md);
}

figcaption {
  margin-top: 16px;
  font-size: 16px;
  color: var(--text-secondary);
  text-align: left;
}

figcaption strong {
  color: var(--text-primary);
}

/* Result Cards */
.results-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin: 32px 0;
}

.result-card {
  background: linear-gradient(135deg, var(--cka-primary), var(--cka-secondary));
  color: white;
  padding: 32px 24px;
  border-radius: var(--radius-lg);
  text-align: center;
}

.result-number {
  font-size: 40px;
  font-weight: 700;
  margin-bottom: 8px;
}

.result-label {
  font-size: 13px;
  opacity: 0.9;
}

/* Data Table Refinements */
.table-scroll {
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.data-table th, .data-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
  border-right: 1px solid rgba(0,0,0,0.03);
}

.data-table th {
  background-color: var(--bg-secondary);
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  font-size: 13px;
  letter-spacing: 0.02em;
}

.data-table .group-row td {
  background-color: var(--bg-accent);
  font-weight: 700;
  color: var(--text-secondary);
}

/* Paper-style Coloring */
.bg-harmful { background-color: rgba(245, 158, 11, 0.08) !important; }
.bg-overall { background-color: rgba(99, 102, 241, 0.08) !important; }

.data-table tr.best-row td {
  background-color: rgba(99, 102, 241, 0.15) !important;
  border-top: 2px solid var(--cka-primary);
  border-bottom: 2px solid var(--cka-primary);
}

.data-table td.best-val {
  font-weight: 800;
  color: var(--text-primary);
}

.num { text-align: right !important; font-family: 'JetBrains Mono', monospace; }

/* Phi Metric Intuitive Example */
.phi-example-container {
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin: 32px 0;
  border: 1px solid var(--border-subtle);
}

.phi-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(56px, 1fr));
  grid-auto-rows: min-content;
  gap: 16px 14px;
  align-items: center;
}

.phi-grid-title {
  grid-column: 1 / -1;
  text-align: center;
  font-weight: 700;
  font-size: 17px;
  color: var(--text-primary);
}

.phi-track {
  grid-column: 1 / -1;
  grid-row: 3;
  display: grid;
  grid-template-columns: repeat(5, minmax(56px, 1fr));
  align-items: center;
  gap: 12px;
  position: relative;
  padding: 16px 0;
}

.phi-turn {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: white;
  border: 2px solid var(--border-emphasis);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
  color: var(--text-muted);
  position: relative;
  z-index: 2;
  margin: 0 auto;
}

.phi-turn.is-t-star {
  border-color: var(--warning-red);
  color: var(--warning-red);
  background: #fff1f2;
}

.phi-turn.is-t-star::after {
  content: 't*';
  position: absolute;
  top: -28px;
  font-size: 13px;
  font-weight: 800;
}

.phi-track::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 25px;
  right: 25px;
  height: 2px;
  background: var(--border-subtle);
  z-index: 1;
  transform: translateY(-50%);
}

.phi-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
}

.phi-marker-top {
  grid-row: 2;
}

.phi-marker-bottom {
  grid-row: 4;
}

.phi-col-1 { grid-column: 1; }
.phi-col-2 { grid-column: 2; }
.phi-col-3 { grid-column: 3; }
.phi-col-4 { grid-column: 4; }
.phi-col-5 { grid-column: 5; }

.phi-marker .val {
  font-weight: 800;
  font-size: 15px;
  color: var(--cka-primary);
}

.phi-marker .label {
  font-size: 12.5px;
  color: var(--text-secondary);
  font-weight: 700;
  line-height: 1.3;
  max-width: 160px;
}

.phi-arrow {
  width: 2px;
  height: 16px;
  background: var(--cka-primary);
  position: relative;
}

.phi-arrow::after {
  content: '';
  position: absolute;
  left: 50%;
  bottom: -6px;
  transform: translateX(-50%);
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 6px solid var(--cka-primary);
}

.phi-marker-bottom .phi-arrow::after {
  top: -6px;
  bottom: auto;
  border-top: none;
  border-bottom: 6px solid var(--cka-primary);
}

@media (max-width: 720px) {
  .motion-iframe {
    height: 720px;
    min-height: 320px;
  }

  .phi-grid {
    grid-template-columns: repeat(5, minmax(42px, 1fr));
    gap: 10px 10px;
  }

  .phi-track {
    grid-template-columns: repeat(5, minmax(42px, 1fr));
  }

  .phi-turn {
    width: 50px;
    height: 50px;
    font-size: 15px;
  }

  .phi-grid-title {
    font-size: 16px;
  }

  .phi-marker .label {
    max-width: 120px;
  }
}

.phi-case-scores {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text-secondary);
}

.card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--cka-primary);
}

.card p {
  font-size: 16px;
  color: var(--text-secondary);
}

.citation-box pre {
  margin: 0;
  overflow-x: auto;
}

.citation-box code {
  font-family: monospace;
  font-size: 14px;
  color: var(--text-secondary);
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.card {
  background: white;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.pill-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.pill {
  background-color: var(--cka-accent);
  color: var(--cka-primary);
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
}

/* Mobile Header */
.site-header.mobile-header {
  display: none;
  background-color: white;
  border-bottom: 1px solid var(--border-subtle);
  padding: 16px 24px;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-toggle {
  background: none;
  border: 1px solid var(--border-subtle);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

@media (max-width: 900px) {
  .sidebar-nav {
    display: none;
  }
  .main-content {
    margin-left: 0;
  }
  .site-header.mobile-header {
    display: block;
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .article-container {
    padding: 40px 20px;
  }
  .article-title {
    font-size: 32px;
  }
}

/* Animations */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s ease-out;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: 40px 0;
  margin-top: 60px;
  text-align: center;
  font-size: 14px;
  color: var(--text-muted);
}