/* ==========================================================================
   Base Styles: Academic & Minimalist Design System
   ========================================================================== */

:root {
  /* Color Palette */
  --bg-primary: #ffffff;
  --bg-secondary: #f7f7f7;
  --bg-subtle: #f0f0f0;
  --bg-card: #ffffff;
  --bg-code: #f6f8fa;
  --bg-header: #ffffff;
  --bg-footer: #f7f7f7;  

  /* Typography Colors */
  --text-primary: #18181b;
  --text-secondary: #52525b;
  --text-muted: #71717a;
  --text-link: #0969da;
  --text-link-hover: #1b4b91;

  /* Accent Color */
  --accent-color: #0969da;

  /* Borders & Dividers */
  --border-subtle: #d4d4d8;
  --border-muted: #c4c4c8;

  /* Elevation */
  --shadow-card: rgba(0, 0, 0, 0.05);
  --shadow-menu: rgba(0, 0, 0, 0.05);

  /* Typography Scales */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Charter", "Bitstream Charter", "Sitka Text", "Cambria", Georgia, serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  /* Spacing & Layout */
  --content-max-width: 54rem; /* 864px for optimal academic prose reading */
  --wide-max-width: 68rem;
  --nav-height: 4rem;
  --radius-sm: 4px;
  --radius-md: 6px;
}

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

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

/* Prose Elements (markdown content) */
p,
.prose-content p {
  margin-bottom: 1.25em;
}

.prose-content h1, 
.prose-content h2, 
.prose-content h3, 
.prose-content h4, 
.prose-content h5, 
.prose-content h6 {
  color: var(--text-primary);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin-top: 1.8em;
  margin-bottom: 0.6em;
}

.prose-content h1 {
  font-size: 2.125rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  border: none;
}

.prose-content h2 {
  font-size: 1.5rem;
  padding-bottom: 0.35rem;
  border: none;
}

.prose-content h3 {
  font-size: 1.25rem;
}

.prose-content h4 {
  font-size: 1.05rem;
}

a, 
.prose-content a {
  color: var(--text-primary);
  text-decoration: underline;
  text-decoration-color:var(--text-link);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

a:hover, 
.prose-content a:hover {
  color: var(--text-link);
  text-decoration-thickness: 3px;
}

/* Lists */
ul,
.prose-content ul {
  margin-bottom: 1.25em;
  padding-left: 1.6em;
  list-style: disc;
}

ol,
.prose-content ol  {
  margin-bottom: 1.25em;
  padding-left: 1.6em;
  list-style: decimal;
}

li, 
.prose-content li {
  margin-bottom: 0.4em;
}

li::marker, 
.prose-content li::marker {
  color: var(--text-muted);
}

/* Blockquotes */
blockquote,
.prose-content blockquote {
  margin: 1.5em 0;
  padding: 0.5em 0 0.5em 1.25em;
  border-left: 3px solid var(--border-muted);
  color: var(--text-secondary);
  font-style: italic;
}

blockquote p:last-child,
.prose-content blockquote p:last-child {
  margin-bottom: 0;
}

/* Horizontal Rule */
hr, .prose-content hr {
  border: 0;
  border-top: 1px solid var(--border-subtle);
  margin: 2.5em 0;
}

/* Inline Code & Preformatted Blocks */
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background-color: var(--bg-code);
  padding: 0.15em 0.35em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
}

pre {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  background-color: var(--bg-code);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  overflow-x: auto;
  line-height: 1.5;
  margin: 1.5em 0;
}

pre code {
  background: transparent;
  padding: 0;
  border: none;
  font-size: inherit;
  color: inherit;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75em 0;
  font-size: 0.95rem;
}

th, td {
  padding: 0.65rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

th {
  font-weight: 600;
  color: var(--text-primary);
  background-color: var(--bg-subtle);
  border-top: 1px solid var(--border-subtle);
}

tr:hover td {
  background-color: var(--bg-secondary);
}

/* Images & Media */
img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
}