/* ============================================
   Shreyas Fadnavis — Personal Site
   Artistic Redesign
   ============================================ */

/* 0. Fonts & Reset */
@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,300;0,6..72,400;0,6..72,500;0,6..72,600;0,6..72,700;1,6..72,300;1,6..72,400;1,6..72,500&family=Inter:wght@300;400;450;500;600;700&display=swap');

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

/* 1. CSS Custom Properties */
:root {
  /* Core palette (preserved) */
  --bg: #faf8f5;
  --bg-nav: rgba(250, 248, 245, 0.88);
  --text: #1c1917;
  --text-secondary: #6b6560;
  --accent: #a0522d;
  --accent-hover: #7c3f22;
  --accent-subtle: rgba(160, 82, 45, 0.08);
  --border: #e5e0da;
  --border-light: #ece8e3;
  --surface: #f3f0ec;

  /* Extended palette */
  --accent-light: #c4845a;
  --accent-wash: rgba(160, 82, 45, 0.04);
  --ink: #2c2420;
  --cream: #f5f0e8;
  --clay: #d4a574;
  --charcoal-fade: rgba(28, 25, 23, 0.06);

  /* Font families */
  --serif: 'Newsreader', 'Georgia', serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Type scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.5rem;
  --text-2xl: 2rem;
  --text-3xl: 2.667rem;
  --text-4xl: 3.556rem;
  --text-hero: clamp(3.5rem, 8vw, 6rem);

  /* Layout widths */
  --max-w: 680px;
  --max-w-wide: 900px;
  --max-w-hero: 1200px;
  --max-w-post: 720px;
  --grid-gap: 2.5rem;
}

/* 2. Base Typography */
html {
  font-size: 17px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: rgba(160, 82, 45, 0.15);
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 500;
  color: var(--text);
  line-height: 1.28;
}

h1 { font-size: 2.4rem; letter-spacing: -0.03em; margin-bottom: 0.4em; }
h2 { font-size: 1.55rem; letter-spacing: -0.02em; margin-top: 2em; margin-bottom: 0.5em; }
h3 { font-size: 1.18rem; margin-top: 1.8em; margin-bottom: 0.4em; }
h4 { font-size: 1rem; font-weight: 600; margin-top: 1.5em; margin-bottom: 0.3em; }

p { margin-bottom: 1.25em; }

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

a:hover { color: var(--accent-hover); }

/* Animated underline for body links */
article.post .post-body a,
.hero-bio a,
.links-origin-prose a,
.links-prose a {
  background-image: linear-gradient(var(--accent), var(--accent));
  background-size: 0% 1px;
  background-position: left bottom;
  background-repeat: no-repeat;
  transition: background-size 0.3s ease, color 0.2s ease;
  padding-bottom: 1px;
}

article.post .post-body a:hover,
.hero-bio a:hover,
.links-origin-prose a:hover,
.links-prose a:hover {
  background-size: 100% 1px;
}

strong { font-weight: 600; }

hr {
  border: none;
  border-top: 1px solid var(--border-light);
  margin: 2.5em 0;
}

blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.8em 1.4em;
  margin: 2em 0;
  color: var(--text-secondary);
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.05rem;
  background: var(--accent-subtle);
  border-radius: 0 6px 6px 0;
  position: relative;
}

blockquote::before {
  content: '\201C';
  font-family: var(--serif);
  font-size: 3rem;
  color: var(--accent);
  opacity: 0.15;
  position: absolute;
  top: -0.1em;
  left: 0.15em;
  line-height: 1;
}

ul, ol { padding-left: 1.4em; margin-bottom: 1.4em; }
li { margin-bottom: 0.45em; line-height: 1.75; }

/* 3. Utilities & Motifs */
.dot-grid {
  background-image: radial-gradient(circle, var(--charcoal-fade) 1px, transparent 1px);
  background-size: 24px 24px;
}

/* 4. Navigation */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-nav);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-light);
  padding: 1rem 0;
}

.nav-inner {
  max-width: var(--max-w-hero);
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Monogram (index pages) */
.site-mark {
  font-family: var(--serif);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -0.03em;
  width: 2.4rem;
  height: 2.4rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1.5px solid var(--accent);
  border-radius: 50%;
  transition: all 0.3s ease;
  text-decoration: none;
  flex-shrink: 0;
}

.site-mark:hover {
  background: var(--accent);
  color: var(--bg);
  transform: rotate(-8deg) scale(1.05);
}

/* Full name (post pages) */
.site-name {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.02em;
  transition: color 0.2s, letter-spacing 0.3s;
}

.site-name:hover {
  color: var(--accent);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}

.nav-links a {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: 450;
  letter-spacing: 0.02em;
  position: relative;
  transition: color 0.2s;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--accent);
  transition: width 0.3s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

/* 5. Homepage: Hero */
.home {
  max-width: none;
  padding: 0;
}

.hero {
  padding: 6rem 2rem 5rem;
  position: relative;
  overflow: hidden;
}

.hero-inner {
  max-width: var(--max-w-hero);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 4rem;
  align-items: end;
}

.hero-name {
  font-family: var(--serif);
  font-size: var(--text-hero);
  font-weight: 300;
  line-height: 0.95;
  letter-spacing: -0.04em;
  color: var(--ink);
  margin: 0;
}

.hero-first { display: block; }

.hero-last {
  display: block;
  color: var(--accent);
}

.hero-rule {
  width: 80px;
  height: 3px;
  background: linear-gradient(to right, var(--accent), var(--clay));
  margin-top: 1.5rem;
  border-radius: 2px;
}

.hero-meta {
  padding-bottom: 0.5rem;
}

.hero-tagline {
  font-family: var(--serif);
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.hero-bio {
  font-family: var(--sans);
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--text);
  margin-bottom: 1.8rem;
}

.hero-links {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.social-pill {
  font-size: var(--text-xs);
  font-family: var(--sans);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  padding: 0.45em 1.1em;
  border-radius: 20px;
  transition: all 0.25s ease;
}

.social-pill:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-wash);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(160, 82, 45, 0.12);
}

/* 6. Homepage: Research Tracks */
.tracks {
  padding: 4rem 2rem 5rem;
  background: var(--cream);
  border-top: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
}

.tracks-inner {
  max-width: var(--max-w-hero);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.track {
  display: flex;
  gap: 1.5rem;
  position: relative;
}

.track-label-wrap {
  flex-shrink: 0;
  width: 1.5rem;
  position: relative;
}

.track-label-vertical {
  position: absolute;
  top: 5rem;
  left: 50%;
  transform: translateX(-50%) rotate(-90deg);
  transform-origin: center center;
  white-space: nowrap;
  font-family: var(--sans);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  opacity: 0.4;
}

.track-content { flex: 1; }

.track-title {
  font-family: var(--serif);
  font-size: var(--text-3xl);
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: var(--text);
  margin: 0 0 0.4em;
  position: relative;
}

.track-title::after {
  content: '';
  display: block;
  width: 2.5em;
  height: 2.5px;
  background: linear-gradient(to right, var(--accent), transparent);
  margin-top: 0.35em;
  border-radius: 2px;
}

/* Track: large faded numeral */
.track-number {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  opacity: 0.45;
  line-height: 1;
  display: block;
  margin-bottom: 0.6rem;
}

/* Track: narrative paragraph */
.track-narrative {
  font-family: var(--serif);
  font-size: var(--text-base);
  color: var(--text);
  line-height: 1.75;
  margin-bottom: 1.5rem;
}

/* Track: metadata line (count + range) */
.track-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  font-family: var(--sans);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.track-count {
  font-weight: 600;
  color: var(--accent);
}

.track-meta-sep {
  color: var(--border);
  font-size: 0.7rem;
  user-select: none;
}

.track-range {
  font-style: italic;
}

/* Track: "Start here" entry point */
.track-entry {
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 0.8rem 1.2rem;
  margin-bottom: 1.5rem;
  transition: all 0.25s ease;
}

.track-entry:hover {
  border-color: var(--accent);
  background: var(--accent-wash);
  transform: translateX(3px);
  box-shadow: 0 3px 12px rgba(160, 82, 45, 0.08);
}

.track-entry-label {
  display: block;
  font-family: var(--sans);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.25rem;
  opacity: 0.7;
}

.track-entry-link {
  font-family: var(--serif);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--text);
  line-height: 1.35;
  transition: color 0.2s;
}

.track-entry:hover .track-entry-link {
  color: var(--accent);
}

.track-cta {
  font-family: var(--sans);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.01em;
  transition: letter-spacing 0.3s ease;
}

.track-cta:hover {
  letter-spacing: 0.04em;
}

/* 7. Homepage: Bottom Strip */
.bottom-strip {
  padding: 3rem 2rem;
}

.bottom-strip-inner {
  max-width: var(--max-w-hero);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.strip-card {
  display: block;
  padding: 2rem 2.2rem;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 10px;
  text-decoration: none;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.strip-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--accent);
  transition: width 0.4s ease;
}

.strip-card:hover::before {
  width: 100%;
}

.strip-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(160, 82, 45, 0.1);
  border-color: var(--accent);
}

.strip-card-label {
  display: block;
  font-family: var(--sans);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.5rem;
}

.strip-card-text {
  display: block;
  font-family: var(--serif);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 8. Notes Index */
.notes-index {
  max-width: none;
  padding: 0;
}

.notes-hero {
  padding: 5rem 2rem 3rem;
  text-align: center;
}

.notes-hero-inner {
  max-width: 600px;
  margin: 0 auto;
}

.notes-page-title {
  font-family: var(--serif);
  font-size: var(--text-4xl);
  font-weight: 300;
  letter-spacing: -0.04em;
  color: var(--text);
  margin-bottom: 0.3em;
  line-height: 1.15;
}

.notes-page-desc {
  font-family: var(--serif);
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.notes-page-intro {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: 1.7;
}

.notes-page-intro em {
  color: var(--accent);
  font-style: normal;
  font-weight: 500;
}

.notes-topic-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 2rem;
}

.notes-topic-link {
  font-family: var(--sans);
  font-size: var(--text-sm);
  font-weight: 450;
  color: var(--text-secondary);
  padding: 0.3em 0.8em;
  border-radius: 20px;
  transition: all 0.2s;
}

.notes-topic-link:hover,
.notes-topic-link.active {
  color: var(--accent);
  background: var(--accent-subtle);
}

.notes-topic-sep {
  color: var(--border);
  font-size: 0.7rem;
  user-select: none;
}

/* Three-column notes grid */
.notes-grid {
  padding: 0 2rem 5rem;
}

.notes-grid-inner {
  max-width: var(--max-w-hero);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
}

/* Hide HTML divider elements — replaced by CSS borders */
.notes-divider {
  display: none;
}

.notes-column {
  padding: 2.5rem 2rem;
  scroll-margin-top: 5rem;
  position: relative;
}

/* Vertical separator between columns (CSS-only) */
.notes-column:not(:first-child)::before {
  content: '';
  position: absolute;
  left: 0;
  top: 3rem;
  bottom: 3rem;
  width: 1px;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--border) 15%,
    var(--accent) 50%,
    var(--border) 85%,
    transparent
  );
  opacity: 0.5;
}

/* Top accent bar per column */
.notes-column-header {
  position: relative;
  padding-top: 1rem;
  margin-bottom: 0.5rem;
}

.notes-column-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3rem;
  height: 3px;
  background: linear-gradient(to right, var(--accent), var(--clay));
  border-radius: 2px;
}

.notes-column-number {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  opacity: 0.45;
  line-height: 1;
  display: block;
  margin-bottom: 0.6rem;
}

.notes-column-title {
  font-family: var(--serif);
  font-size: clamp(1.4rem, 2vw, 2rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  color: var(--text);
  margin: 0 0 0.5em;
  line-height: 1.2;
}

.notes-column-title::after {
  content: '';
  display: block;
  width: 2em;
  height: 2px;
  background: linear-gradient(to right, var(--accent), transparent);
  margin-top: 0.35em;
  border-radius: 2px;
}

.notes-column-desc {
  font-family: var(--serif);
  font-size: var(--text-sm);
  font-style: italic;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 2rem;
}

/* Notes list within each column */
.notes-column-list {
  list-style: none;
  counter-reset: col-note;
  padding: 0;
  margin: 0;
}

.notes-column-list li {
  counter-increment: col-note;
}

.note-link {
  display: block;
  padding: 0.9rem 0.7rem 0.9rem 2.6rem;
  position: relative;
  text-decoration: none;
  border-radius: 8px;
  margin-bottom: 2px;
  border-left: 2px solid transparent;
  transition: all 0.25s ease;
}

.note-link::before {
  content: counter(col-note);
  position: absolute;
  left: 0.4rem;
  top: 1rem;
  font-family: var(--serif);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--accent);
  opacity: 0.2;
  transition: opacity 0.25s ease;
}

.note-link-title {
  display: block;
  font-family: var(--serif);
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--text);
  line-height: 1.35;
  margin-bottom: 0.2em;
  transition: color 0.2s;
}

.note-link-summary {
  display: block;
  font-size: var(--text-xs);
  color: var(--text-secondary);
  line-height: 1.55;
}

.note-link:hover {
  background: var(--accent-wash);
}

.note-link:hover .note-link-title {
  color: var(--accent);
}

/* 9. Links Page */
.links-page {
  max-width: none;
  padding: 0;
}

.links-origin {
  padding: 5rem 2rem 3rem;
}

.links-origin-inner {
  max-width: 800px;
  margin: 0 auto;
}

.links-page-title {
  font-family: var(--serif);
  font-size: var(--text-4xl);
  font-weight: 300;
  letter-spacing: -0.04em;
  margin-bottom: 0.3em;
  color: var(--text);
  line-height: 1.15;
}

.links-page-desc {
  font-family: var(--serif);
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.5;
}

.links-origin-label {
  font-family: var(--sans);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 0.8rem;
  display: block;
}

.links-origin-prose {
  font-size: var(--text-base);
  line-height: 1.8;
  margin-bottom: 0;
}

.links-origin-prose p {
  margin-bottom: 1em;
}

.links-origin-prose p:last-child {
  margin-bottom: 0;
}

/* Three-column resource grid */
.links-grid-section {
  padding: 3rem 2rem 5rem;
  background: var(--cream);
  border-top: 1px solid var(--border-light);
}

.links-grid-inner {
  max-width: var(--max-w-hero);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: start;
}

.links-category-title {
  font-family: var(--serif);
  font-size: var(--text-xl);
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 0.5em;
  color: var(--text);
  line-height: 1.3;
}

.links-category-title::after {
  content: '';
  display: block;
  width: 2em;
  height: 2px;
  background: var(--accent);
  margin-top: 0.3em;
  opacity: 0.5;
}

.links-category-intro {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.link-card-v2 {
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
  margin-bottom: 0.8rem;
  position: relative;
  transition: all 0.3s ease;
  border-top: 2px solid var(--accent);
}

.link-card-v2:hover {
  transform: translateY(-2px) rotate(-0.3deg);
  box-shadow: 0 6px 20px rgba(160, 82, 45, 0.08);
}

.link-card-v2-title {
  font-family: var(--serif);
  font-size: 1.02rem;
  font-weight: 500;
  margin: 0 0 0.2em;
}

.link-card-v2-title a {
  color: var(--text);
  transition: color 0.2s;
}

.link-card-v2-title a:hover {
  color: var(--accent);
}

.link-card-v2-meta {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.4em;
}

.link-card-v2-list {
  margin-top: 0.5em;
  margin-bottom: 0;
  padding-left: 1.2em;
}

.link-card-v2-list li {
  font-size: 0.85rem;
  margin-bottom: 0.25em;
}

/* Legacy links page classes (for prose sections) */
.links-prose {
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

.links-prose p {
  font-size: 0.95rem;
}

/* 10. Blog Post: Header & Nav */
main.post-main {
  max-width: var(--max-w-post);
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
  animation: contentFadeIn 0.5s ease-out;
}

@keyframes contentFadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

article.post .post-header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
}

article.post .post-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 400;
  line-height: 1.18;
  letter-spacing: -0.03em;
  margin-bottom: 0.4em;
  position: relative;
}

article.post .post-header h1::after {
  content: '';
  display: block;
  width: 5em;
  height: 2.5px;
  background: linear-gradient(to right, var(--accent), var(--clay), transparent);
  margin-top: 0.5em;
  border-radius: 2px;
}

article.post .post-subtitle {
  font-family: var(--serif);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-style: italic;
}

/* Post body headings */
article.post .post-body h2 {
  font-family: var(--serif);
  font-size: 1.4rem;
  text-transform: none;
  letter-spacing: -0.015em;
  color: var(--text);
  border-bottom: none;
  margin-top: 2.5em;
  margin-bottom: 0.7em;
  padding-bottom: 0;
}

article.post .post-body h3 {
  font-family: var(--serif);
  font-size: 1.12rem;
  margin-top: 2em;
}

article.post .post-body h4 {
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  margin-top: 1.8em;
}

/* 11. Blog Post: Body Content */
/* Math */
.katex-display {
  margin: 2.4em 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0.6em 0;
}

.katex { font-size: 1.08em; }

.katex:not(.katex-display .katex) {
  padding: 0 0.08em;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 2.5em 0;
  font-size: 0.9rem;
}

thead { border-bottom: 2px solid var(--text); }

th {
  text-align: left;
  padding: 0.55em 0.7em;
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

td {
  padding: 0.5em 0.7em;
  border-bottom: 1px solid var(--border-light);
}

tbody tr:hover { background: var(--surface); }

/* Further Reading */
.further-reading {
  background: var(--surface);
  border-radius: 8px;
  padding: 1.5em 1.8em;
  margin-top: 3em;
  border: 1px solid var(--border-light);
  transition: box-shadow 0.3s ease;
}

.further-reading:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

.further-reading h3 {
  margin-top: 0;
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.8em;
}

.further-reading ul { margin-bottom: 0; }
.further-reading li { font-size: 0.9rem; margin-bottom: 0.5em; }

/* Post Navigation */
.post-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-light);
}

.post-nav a {
  display: block;
  padding: 1rem 1.2rem;
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 8px;
  font-size: var(--text-sm);
  color: var(--text);
  line-height: 1.4;
  transition: all 0.2s;
  max-width: none;
}

.post-nav a:hover {
  border-color: var(--accent);
  background: var(--accent-wash);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(160, 82, 45, 0.08);
  color: var(--accent);
}

.post-nav .prev { text-align: left; }
.post-nav .prev::before { content: "\2190\00a0"; }
.post-nav .next { text-align: right; }
.post-nav .next::after { content: "\00a0\2192"; }

/* Series Banner */
.series-banner {
  background: var(--accent-wash);
  border-left: 3px solid var(--accent);
  padding: 0.8em 1.3em;
  margin-bottom: 2.5em;
  font-size: var(--text-sm);
  border-radius: 0 8px 8px 0;
  color: var(--text-secondary);
}

.series-banner a { font-weight: 500; }

/* Difficulty Levels */
.level {
  margin: 2.5em 0;
  padding: 0;
}

.level-header {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.2em;
  padding-bottom: 0.6em;
  border-bottom: 1.5px solid var(--border);
  cursor: pointer;
  user-select: none;
}

.level-header:hover .level-badge {
  transform: scale(1.05);
}

.level-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.3em 0.9em;
  border-radius: 20px;
  transition: transform 0.15s;
  flex-shrink: 0;
}

.level-badge.intuitive { background: #e8f5e9; color: #2e7d32; }
.level-badge.technical { background: #e3f2fd; color: #1565c0; }
.level-badge.advanced { background: #fce4ec; color: #c62828; }

.level-header h2 {
  font-family: var(--serif);
  font-size: 1.3rem;
  margin: 0;
  padding: 0;
  border: none;
  letter-spacing: -0.015em;
}

.level-toggle {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-secondary);
  transition: transform 0.3s ease;
}

.level-header[aria-expanded="false"] .level-toggle {
  transform: rotate(-90deg);
}

.level-content {
  overflow: hidden;
  transition: max-height 0.4s ease, opacity 0.3s ease;
}

.level-content.collapsed {
  max-height: 0;
  opacity: 0;
}

/* Drop cap */
.level-content > p:first-child::first-letter {
  font-family: var(--serif);
  font-size: 3.2em;
  float: left;
  line-height: 0.8;
  padding-right: 0.08em;
  margin-top: 0.05em;
  color: var(--accent);
  font-weight: 500;
}

.level + .level {
  border-top: 1px dashed var(--border-light);
  padding-top: 1em;
}

/* Mermaid Diagrams */
.mermaid {
  margin: 3em 0 1.5em;
  text-align: center;
  background: var(--surface);
  border-radius: 8px;
  padding: 2em 1.5em;
  overflow-x: auto;
  border: 1px solid var(--border-light);
  transition: box-shadow 0.3s ease;
}

.mermaid:hover {
  box-shadow: 0 3px 15px rgba(0, 0, 0, 0.05);
}

.mermaid svg {
  max-width: 100%;
  height: auto;
}

.diagram-caption {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-style: italic;
  margin-top: 0.4em;
  margin-bottom: 2.5em;
}

/* Key Insight Callout */
.callout {
  border-left: 3px solid var(--accent);
  padding: 1.2em 1.5em;
  margin: 2em 0;
  background: var(--accent-subtle);
  border-radius: 0 8px 8px 0;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.callout:hover {
  box-shadow: 0 2px 10px rgba(160, 82, 45, 0.08);
  transform: translateX(2px);
}

.callout-label {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 0.4em;
}

.callout p:last-child { margin-bottom: 0; }

/* Analogy Box */
.analogy {
  background: #f8f6f0;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.4em 1.6em;
  margin: 2em 0;
  transition: box-shadow 0.3s ease;
}

.analogy:hover {
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.analogy-label {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6b6560;
  margin-bottom: 0.4em;
}

.analogy p:last-child { margin-bottom: 0; }

/* 12. Lightbox */
.post-body img { cursor: zoom-in; }
.post-body .mermaid { cursor: zoom-in; }

.lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: zoom-out;
  opacity: 0;
  transition: opacity 0.3s ease;
  padding: 2rem;
}

.lightbox-overlay.active { opacity: 1; }

.lightbox-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: 90vw;
  max-height: 85vh;
  transform: scale(0.92);
  transition: transform 0.3s ease;
  cursor: default;
}

.lightbox-overlay.active .lightbox-stage { transform: scale(1); }

.lightbox-stage img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: 8px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
}

.lightbox-mermaid {
  background: var(--bg, #faf8f5);
  border-radius: 10px;
  padding: 2.5em 2em;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
  max-width: 90vw;
  max-height: 85vh;
  overflow: auto;
}

.lightbox-mermaid svg { max-width: 100%; height: auto; }

.lightbox-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  color: #fff;
  font-size: 1.5rem;
  font-family: var(--sans);
  font-weight: 300;
  opacity: 0.7;
  cursor: pointer;
  background: none;
  border: none;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s;
  z-index: 1001;
}

.lightbox-close:hover { opacity: 1; }

.lightbox-caption {
  position: absolute;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.8);
  font-family: var(--serif);
  font-size: 0.9rem;
  font-style: italic;
  text-align: center;
  max-width: 80vw;
}

/* 13. Footer */
footer {
  max-width: var(--max-w-hero);
  margin: 0 auto;
  border-top: 1px solid var(--border-light);
  padding: 2rem 2rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  display: flex;
  justify-content: space-between;
  align-items: center;
  letter-spacing: 0.01em;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
}

footer a { color: var(--text-secondary); transition: color 0.2s; }
footer a:hover { color: var(--accent); }

/* 14. Animations */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-name-block {
  animation: fadeUp 0.7s ease-out both;
}

.hero-meta {
  animation: fadeUp 0.7s ease-out 0.15s both;
}

/* Scroll reveal */
.reveal-target {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-target.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-target:nth-child(2) { transition-delay: 0.1s; }
.reveal-target:nth-child(3) { transition-delay: 0.2s; }

/* 15. Responsive */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .hero-name {
    font-size: clamp(2.5rem, 10vw, 4rem);
  }

  .hero { padding: 4rem 2rem 3rem; }

  .tracks-inner {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .bottom-strip-inner {
    grid-template-columns: 1fr;
  }

  .notes-grid-inner {
    grid-template-columns: 1fr;
  }

  .notes-divider {
    padding: 0 2rem;
    height: 1px;
  }

  .notes-divider-line {
    width: 100%;
    height: 1px;
    background: linear-gradient(
      to right,
      transparent,
      var(--accent) 50%,
      transparent
    );
  }

  .links-grid-inner {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  html { font-size: 16px; }

  .nav-inner { padding: 0 1.2rem; }
  .nav-links { gap: 1.5rem; }

  main.post-main { padding: 2rem 1.2rem 3rem; }
  h1 { font-size: 2rem; }

  article.post .post-header h1 { font-size: 1.7rem; }
  .post-nav { grid-template-columns: 1fr; }

  footer { flex-direction: column; gap: 0.5rem; text-align: center; }

  .level-header { flex-wrap: wrap; }
  .level-header h2 { font-size: 1.1rem; }

  .mermaid { padding: 1em 0.5em; }
  .lightbox-overlay { padding: 1rem; }
}

@media (max-width: 600px) {
  .hero { padding: 3rem 1.2rem 2.5rem; }
  .tracks { padding: 3rem 1.2rem; }
  .notes-hero { padding: 3rem 1.2rem 2rem; }
  .notes-grid { padding: 0 1.2rem 3rem; }
  .links-origin { padding: 3rem 1.2rem 2rem; }
  .links-grid-section { padding: 2rem 1.2rem 3rem; }

  .track-label-wrap { display: none; }
  .track-title { font-size: var(--text-2xl); }

  .notes-page-title { font-size: var(--text-2xl); }
  .links-page-title { font-size: var(--text-2xl); }

  .nav-links { gap: 1rem; }
}