/* 
 * spl_github_pages/assets/css/styles.css
 * LessWrong-inspired academic presentation aesthetic
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400&display=swap');

:root {
  /* Light Mode Palette */
  --bg-main: #fdfdfd;
  --bg-secondary: #f4f4f4;
  --text-main: #1a1a1a;
  --text-muted: #555555;
  --border-color: #dddddd;
  
  --color-gt: #2ca02c;
  --color-pred-a: #1f77b4;
  --color-pred-b: #d62728;
  --color-accent: #2c5282;

  --font-serif: Palatino, "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  
  --chart-grid: rgba(0, 0, 0, 0.1);
  --chart-text: #666666;
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Dark Mode Palette - Deep rich dark theme */
    --bg-main: #1f1e1e;
    --bg-secondary: #000000;
    --text-main: #e0e0e0;
    --text-muted: #999999;
    --border-color: #f0f0f0;
    --color-accent: #63b3ed;
    
    --chart-grid: rgba(255, 255, 255, 0.15);
    --chart-text: #cccccc;
  }
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-serif);
  color: var(--text-main);
  background-color: var(--bg-main);
  line-height: 1.7;
  margin: 0;
  padding: 0;
  font-size: 18px; /* Slightly larger base font for readability */
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Layout */
.layout-container {
  display: block;
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 20px 60px 40px; /* 40px left to clear rail */
}

/* ---------- LessWrong-style TOC Sidebar ---------- */
.toc-sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  height: auto;
  z-index: 100;
  width: 24px;
  transition: width .3s ease;
  overflow: hidden;
  background: transparent;
  border-right: none;
}
.toc-sidebar:hover {
  width: 260px;
}
.toc-rail {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--color-accent) 0%, transparent 100%);
  opacity: .35;
  transition: opacity .3s;
}
.toc-sidebar:hover .toc-rail { opacity: 0 }

.toc-dots {
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: opacity .25s;
}
.toc-sidebar:hover .toc-dots { opacity: 0 }
.toc-dot {
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background .2s, transform .2s;
}
.toc-dot.active {
  background: var(--color-accent);
  transform: scale(1.5);
}

.toc-panel {
  width: 260px;
  height: 100%;
  background: var(--bg-main);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-right: 1px solid var(--border-color);
  padding: 32px 20px 32px 20px;
  opacity: 0;
  transform: translateX(-20px);
  transition: opacity .3s ease, transform .3s ease;
  overflow-y: auto;
}
.toc-sidebar:hover .toc-panel {
  opacity: 1;
  transform: translateX(0);
}
.toc-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-family: var(--font-sans);
}
.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.toc-list li { margin-bottom: 2px }
.toc-list a {
  font-family: var(--font-sans);
  display: block;
  padding: 5px 10px;
  border-radius: 4px;
  font-size: 13px;
  font-weight: 400;
  color: var(--text-muted);
  text-decoration: none;
  transition: all .15s;
  line-height: 1.4;
}
.toc-list a:hover {
  color: var(--text-main);
  background: var(--bg-secondary);
  text-decoration: none;
}
.toc-list a.active {
  color: var(--text-main);
  background: var(--bg-secondary);
  font-weight: 600;
}

/* Main Content Area */
.article-content {
  max-width: 740px; /* Optimal reading width */
  flex-grow: 1;
}

/* Typography */
h1, h2, h3, h4 {
  color: var(--text-main);
}

h1 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: normal;
  text-align: center;
  line-height: 1.2;
  margin-top: 0;
  margin-bottom: 0.5rem;
}

h2 {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: 3.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.authors, .affiliations {
  font-family: var(--font-sans);
  text-align: center;
  color: var(--text-muted);
}
.authors { font-size: 1.1rem; margin-bottom: 0.2rem; margin-top: 1rem;}
.affiliations { font-size: 0.9rem; margin-bottom: 3.5rem; }

p {
  margin-bottom: 1.6rem;
}

/* Abstract */
.abstract {
  background: var(--bg-secondary);
  padding: 20px 30px;
  border-left: 4px solid var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 3rem;
  font-style: normal;
  color: var(--text-main);
}

.abstract strong {
  font-family: var(--font-sans);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--text-main);
  display: block;
  margin-bottom: 12px;
  font-style: normal;
}

/* Equations */
.equation-block {
  text-align: center;
  font-size: 1.2rem;
  margin: 3rem 0;
  padding: 1.5rem 0;
  background: transparent;
  overflow-x: auto;
}

/* Figures */
.figure {
  background: transparent;
  border: none;
  margin: 4rem 0;
  padding: 0;
  box-shadow: none;
}

.figure-caption {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 16px;
  padding-top: 0;
  border-top: none;
  line-height: 1.6;
}

.figure-caption strong {
  color: var(--text-main);
  font-weight: 700;
}

/* Grids & Canvas */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.canvas-container {
  position: relative;
  width: 100%;
  background: transparent;
  border: none;
  overflow: hidden;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
}

.info-panel {
  position: absolute;
  top: 0; 
  left: 0;
  background: transparent;
  border: none;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  box-shadow: none;
  pointer-events: none;
  opacity: 1;
}

/* Controls & UI */
.controls {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  align-items: center;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  flex-wrap: wrap;
}

.btn {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 4px;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  transition: all 0.2s;
}

.btn:hover {
  background: var(--bg-secondary);
  border-color: var(--text-muted);
}

.btn-primary {
  background: var(--text-main);
  color: var(--bg-main);
  border-color: var(--text-main);
}

.btn-primary:hover {
  background: var(--text-muted);
  color: var(--bg-main);
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 12px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
}
.slider-row input[type=range] { flex: 1; accent-color: var(--color-accent); }
.slider-val { width: 60px; font-family: var(--font-mono); text-align: right; }

.param-output {
  margin-top: 32px;
  padding: 0;
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

/* Citation Box */
.citation-box {
  background: transparent;
  border-top: 1px solid var(--border-color);
  padding: 32px 0 0 0;
  margin-top: 5rem;
  font-family: var(--font-sans);
}
.citation-box pre {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  white-space: pre-wrap;
  background: var(--bg-main);
  padding: 12px;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  overflow-x: auto;
}

/* Scroll Reveal Animation */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive Design */
@media (max-width: 768px) {
  .toc-sidebar { display: none; }
  .layout-container {
    padding: 20px 16px 20px 16px;
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  body { font-size: 16px; }
  .slider-row { flex-wrap: wrap; }
  .slider-row label { width: 100%; margin-bottom: -5px;}
  .slider-val { text-align: left; }
}