/* ============================================================
   AKHILESH VARMA — PORTFOLIO DESIGN SYSTEM  (v2)
   Inspired by worldquant.com: white canvas, black blocks,
   oversized light sans type, hairline rules, ASCII motif,
   text-only CTAs and a minimal "open menus" navigation.
   ============================================================ */

/* ── 0. TOKENS ───────────────────────────────────────────── */
:root {
  /* Surfaces (light theme). Legacy token names are kept so older
     inline styles and page-level <style> blocks keep working.    */
  --bg:        #ffffff;
  --bg-1:      #f6f6f3;
  --bg-2:      #eeeeea;
  --bg-3:      #e6e6e1;

  /* Ink scale: 0 = strongest text … 5 = faintest rule */
  --silver-0:  #0a0a0a;
  --silver-1:  #1c1c1c;
  --silver-2:  #4b4b4b;
  --silver-3:  #7b7b7b;
  --silver-4:  #d8d8d3;
  --silver-5:  #ebebe7;

  --ink:       #000000;
  --paper:     #ffffff;
  --signal:    #e8ff3a;   /* single highlight, used sparingly */

  --accent:     var(--silver-0);
  --accent-dim: var(--silver-3);

  --font-display: 'Inter', -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --font-sans:    'Inter', -apple-system, 'Helvetica Neue', Arial, sans-serif;
  --font-mono:    'IBM Plex Mono', ui-monospace, 'Courier New', monospace;

  --nav-h:   64px;
  --max-w:   1440px;
  --paper-w: 820px;
  --gutter:  clamp(20px, 3.4vw, 48px);
  --r:       0px;
}

/* Dark blocks re-map the ink scale so children just work */
.on-dark {
  --bg:       #000;
  --bg-1:     #0b0b0b;
  --bg-2:     #141414;
  --silver-0: #ffffff;
  --silver-1: #e6e6e6;
  --silver-2: #a8a8a8;
  --silver-3: #747474;
  --silver-4: #2a2a2a;
  --silver-5: #1a1a1a;
  background: #000;
  color: #fff;
}

/* ── 1. RESET & BASE ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  background: var(--bg);
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: var(--nav-h);
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--silver-0);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
img, svg, canvas { display: block; max-width: 100%; }
ol, ul { list-style: none; }
::selection { background: var(--ink); color: var(--paper); }
.on-dark ::selection { background: var(--paper); color: var(--ink); }

:focus-visible { outline: 2px solid currentColor; outline-offset: 3px; }

/* Legacy full-page particle canvas is retired */
#sphere-canvas { display: none !important; }

.container { width: 100%; max-width: var(--max-w); margin: 0 auto; padding: 0 var(--gutter); }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ── 2. NAVIGATION ───────────────────────────────────────── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 1000;
  color: var(--silver-0);
  background: var(--paper);
  border-bottom: 1px solid var(--silver-4);
  transition: background .3s ease, color .3s ease, border-color .3s ease;
}
/* transparent + white while sitting on the black hero */
body.has-hero .navbar:not(.solid):not(.menu-open) {
  background: transparent; color: #fff; border-bottom-color: transparent;
}
.navbar.menu-open { background: #000; color: #fff; border-bottom-color: #222; }

.nav-container {
  max-width: var(--max-w); height: 100%; margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}

.nav-brand {
  font-weight: 500; font-size: 1.02rem; letter-spacing: -0.02em;
  display: inline-flex; align-items: baseline; gap: 8px; white-space: nowrap;
}
.nav-brand sup { font-size: .7em; vertical-align: baseline; opacity: .6; }
.nav-brand small {
  font-family: var(--font-mono); font-size: .62rem; font-weight: 400;
  letter-spacing: .08em; text-transform: uppercase; opacity: .55;
}

.nav-links { display: flex; align-items: center; gap: clamp(14px, 2vw, 30px); }
.nav-link {
  font-size: .84rem; font-weight: 400; letter-spacing: -0.005em;
  position: relative; padding: 6px 0; opacity: .72; transition: opacity .15s ease;
}
.nav-link::after {
  content: ''; position: absolute; left: 0; right: 0; bottom: 2px; height: 1px;
  background: currentColor; transform: scaleX(0); transform-origin: left;
  transition: transform .25s ease;
}
.nav-link:hover, .nav-link.active { opacity: 1; }
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }

.nav-right { display: flex; align-items: center; gap: 18px; }
.clock { display: none; }
.btn-nav {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .04em;
  text-transform: uppercase; padding: 8px 14px; border: 1px solid currentColor;
  transition: background .2s ease, color .2s ease;
}
.btn-nav:hover { background: currentColor; }
.btn-nav:hover > * { mix-blend-mode: difference; }
.navbar .btn-nav:hover { color: inherit; }

.menu-toggle {
  display: none; background: none; border: 0; color: inherit;
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .06em;
  text-transform: uppercase; padding: 8px 0;
}
.menu-toggle::before { content: '+ '; }
.navbar.menu-open .menu-toggle::before { content: '– '; }

@media (max-width: 1080px) {
  .menu-toggle { display: inline-block; }
  .nav-right .btn-nav { display: none; }
  .nav-brand small { display: none; }
  .navbar nav {
    position: fixed; inset: var(--nav-h) 0 0 0; background: #000; color: #fff;
    padding: 28px var(--gutter) 40px; overflow-y: auto;
    opacity: 0; pointer-events: none; transform: translateY(-8px);
    transition: opacity .25s ease, transform .25s ease;
  }
  .navbar.menu-open nav { opacity: 1; pointer-events: auto; transform: none; }
  .nav-links { flex-direction: column; align-items: flex-start; gap: 0; }
  .nav-links li { width: 100%; border-bottom: 1px solid #222; }
  .nav-link { display: block; font-size: clamp(1.7rem, 7vw, 2.6rem); font-weight: 300;
    letter-spacing: -0.03em; padding: 16px 0; opacity: 1; }
  .nav-link::after { display: none; }
}

/* ── 3. BUTTONS / TEXT CTAs ──────────────────────────────── */
.btn-primary, .btn-secondary {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: .74rem; letter-spacing: .04em;
  text-transform: uppercase; padding: 12px 18px; border: 1px solid var(--silver-0);
  background: transparent; color: var(--silver-0);
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}
.btn-primary { background: var(--silver-0); color: var(--bg); }
.btn-primary:hover { background: transparent; color: var(--silver-0); }
.btn-secondary { border-color: var(--silver-4); }
.btn-secondary:hover { border-color: var(--silver-0); background: var(--silver-0); color: var(--bg); }

/* ── 4. HERO (black, ASCII) ──────────────────────────────── */
.hero {
  position: relative; min-height: 100svh; max-width: none; width: 100%;
  background: #000; color: #fff; overflow: hidden;
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: calc(var(--nav-h) + 24px) var(--gutter) clamp(28px, 4vw, 48px);
  --silver-0: #fff; --silver-1: #e6e6e6; --silver-2: #a8a8a8; --silver-3: #747474; --silver-4: #2a2a2a;
}
#ascii-hero {
  position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0;
}
.hero::after { /* legibility floor for the headline */
  content: ''; position: absolute; inset: auto 0 0 0; height: 62%; z-index: 1;
  background: linear-gradient(to top, rgba(0,0,0,.92), rgba(0,0,0,0));
  pointer-events: none;
}
.hero > *:not(#ascii-hero) { position: relative; z-index: 2; }

.hero-meta-row {
  position: absolute !important; top: calc(var(--nav-h) + 20px); left: var(--gutter); right: var(--gutter);
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: .68rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--silver-2);
}
.hero-title-block { max-width: var(--max-w); width: 100%; margin: 0 auto; }
.hero-name {
  font-size: clamp(3.2rem, 10.5vw, 10.5rem); font-weight: 300;
  letter-spacing: -0.06em; line-height: .9; margin-bottom: clamp(20px, 3vw, 36px);
}
.hn-solid, .hn-outline { display: block; }
.hn-outline { color: transparent; -webkit-text-stroke: 1px rgba(255,255,255,.85); }
.hero-tagline {
  max-width: 640px; font-size: clamp(.95rem, 1.2vw, 1.12rem); line-height: 1.6;
  color: var(--silver-2); font-weight: 300;
}
.hero-tagline strong { color: #fff; font-weight: 400; display: block; margin-bottom: 8px; }

.hero-bottom {
  max-width: var(--max-w); width: 100%; margin: clamp(28px, 4vw, 52px) auto 0;
  padding-top: 18px; border-top: 1px solid rgba(255,255,255,.22);
  display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; align-items: center;
}
.hero-socials { display: flex; flex-wrap: wrap; gap: 6px 22px; }
.social-link {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .05em;
  text-transform: uppercase; color: var(--silver-2); transition: color .15s ease;
}
.social-link:hover { color: #fff; }

/* ── 5. STAT BAND ────────────────────────────────────────── */
.stat-band { background: #000; color: #fff; border-top: 1px solid #1f1f1f; }
.stat-band .container { display: grid; grid-template-columns: repeat(4, 1fr); }
.stat-band .stat-cell {
  padding: clamp(28px, 4vw, 56px) 0; padding-right: 24px;
  border-left: 1px solid #1f1f1f; padding-left: clamp(16px, 2vw, 28px);
}
.stat-band .stat-cell:first-child { border-left: 0; padding-left: 0; }
.stat-band .n { font-size: clamp(2.4rem, 5.6vw, 5.4rem); font-weight: 300; letter-spacing: -0.05em; line-height: 1; }
.stat-band .l { margin-top: 12px; font-family: var(--font-mono); font-size: .68rem;
  letter-spacing: .08em; text-transform: uppercase; color: #8a8a8a; }
@media (max-width: 720px) {
  .stat-band .container { grid-template-columns: repeat(2, 1fr); }
  .stat-band .stat-cell:nth-child(3) { border-left: 0; padding-left: 0; }
  .stat-band .stat-cell:nth-child(n+3) { border-top: 1px solid #1f1f1f; }
}

/* ── 6. SECTIONS ─────────────────────────────────────────── */
.section { position: relative; padding: clamp(72px, 10vw, 160px) 0; border-top: 1px solid var(--silver-4); }
.section:first-of-type { border-top: 0; }
.section.on-dark { border-top-color: #1f1f1f; }

.sec-label {
  display: block; font-family: var(--font-mono); font-size: .72rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--silver-3); margin-bottom: clamp(20px, 3vw, 36px);
}
.sec-title {
  font-size: clamp(2.6rem, 8vw, 8rem); font-weight: 300; line-height: .94;
  letter-spacing: -0.055em; text-transform: none; max-width: 14ch; margin-bottom: clamp(20px, 3vw, 36px);
}
.sec-desc {
  max-width: 620px; font-size: clamp(1rem, 1.3vw, 1.2rem); line-height: 1.55;
  color: var(--silver-2); font-weight: 300; margin-bottom: clamp(40px, 6vw, 88px);
}
.sec-desc a { color: var(--silver-0); border-bottom: 1px solid var(--silver-4); }
.sec-desc a:hover { border-color: var(--silver-0); }

/* ── 7. CORE BELIEFS (stacked statements) ────────────────── */
.principles-row { display: block; border-top: 1px solid var(--silver-4); margin-top: clamp(40px, 6vw, 88px); }
.principle {
  display: grid; grid-template-columns: minmax(120px, 1fr) 4fr; gap: 24px 40px;
  padding: clamp(28px, 4vw, 56px) 0; border-bottom: 1px solid var(--silver-4);
}
.principle-num { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--silver-3); padding-top: .8rem; }
.principle-title { grid-column: 2; font-size: clamp(1.9rem, 4.6vw, 4.4rem); font-weight: 300;
  letter-spacing: -0.045em; line-height: 1; }
.principle-text { grid-column: 2; max-width: 620px; color: var(--silver-2); font-weight: 300; font-size: 1.05rem; line-height: 1.65; }
@media (max-width: 720px) {
  .principle { grid-template-columns: 1fr; }
  .principle-title, .principle-text { grid-column: 1; }
}

/* ── 8. PAPERS (ruled list) ──────────────────────────────── */
.papers-stack { border-top: 1px solid var(--silver-0); }
.paper-item {
  display: grid; grid-template-columns: 72px 1fr; gap: 0 24px;
  padding: clamp(28px, 4vw, 52px) 0; border-bottom: 1px solid var(--silver-4);
  transition: background .25s ease;
}
.paper-num { font-family: var(--font-mono); font-size: .76rem; color: var(--silver-3); padding-top: .55rem; }
.paper-body {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 0 clamp(24px, 5vw, 80px);
  grid-template-areas: "tags abs" "title abs" "title stat" "title act";
  align-items: start;
}
.paper-tags-row { grid-area: tags; display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.paper-title {
  grid-area: title; font-size: clamp(1.7rem, 3.2vw, 3rem); font-weight: 300; line-height: 1.04;
  letter-spacing: -0.04em; cursor: pointer; transition: opacity .2s ease; align-self: start;
}
.paper-title:hover { opacity: .55; }
.paper-abstract { grid-area: abs; color: var(--silver-2); font-weight: 300; line-height: 1.7; font-size: 1rem; margin-bottom: 20px; }
.paper-stat-bar {
  grid-area: stat; font-family: var(--font-mono); font-size: .72rem; line-height: 1.7;
  color: var(--silver-0); padding: 12px 0; border-top: 1px solid var(--silver-4);
  border-bottom: 1px solid var(--silver-4); margin-bottom: 20px;
}
.paper-actions { grid-area: act; display: flex; flex-wrap: wrap; gap: 10px; }
.tag, .vault-tag, .ph-tag, .tech-pill, .topic-tag, .hub-tag {
  font-family: var(--font-mono); font-size: .66rem; letter-spacing: .04em; text-transform: uppercase;
  padding: 4px 10px; border: 1px solid var(--silver-4); color: var(--silver-2); background: transparent; border-radius: 0;
}
@media (max-width: 900px) {
  .paper-item { grid-template-columns: 1fr; }
  .paper-num { padding: 0 0 14px; }
  .paper-body { grid-template-columns: 1fr; grid-template-areas: "tags" "title" "abs" "stat" "act"; }
  .paper-title { margin-bottom: 20px; }
}

/* ── 9. FOUNDATION CARDS ─────────────────────────────────── */
.grid-3 {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--silver-0); border-left: 1px solid var(--silver-4);
}
@media (max-width: 1000px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .grid-3 { grid-template-columns: 1fr; } }
.grid-card {
  min-height: 320px; padding: clamp(22px, 2.4vw, 36px);
  display: flex; flex-direction: column; justify-content: space-between; gap: 40px;
  border-right: 1px solid var(--silver-4); border-bottom: 1px solid var(--silver-4);
  transition: background .25s ease, color .25s ease;
}
.grid-card:hover { background: #000; color: #fff; }
.grid-card:hover .card-desc, .grid-card:hover .card-type, .grid-card:hover .card-foot { color: #a8a8a8; }
.card-type { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; color: var(--silver-3); margin-bottom: 22px; }
.card-title { font-size: clamp(1.7rem, 2.6vw, 2.5rem); font-weight: 300; letter-spacing: -0.045em; line-height: 1; margin-bottom: 18px; }
.card-desc { font-size: .95rem; line-height: 1.6; color: var(--silver-2); font-weight: 300; }
.card-foot { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: .7rem; color: var(--silver-3); text-transform: uppercase; letter-spacing: .05em; }
.card-arrow { transition: transform .25s ease; }
.grid-card:hover .card-arrow { transform: translateX(6px); }

/* dark chart panel */
.perf-panel { margin-top: clamp(40px, 6vw, 80px); background: #000; color: #fff; padding: clamp(20px, 3vw, 36px); }
.perf-panel .perf-head { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; margin-bottom: 18px;
  font-family: var(--font-mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; color: #8a8a8a; }
.perf-panel canvas { width: 100%; height: 220px; background: #000; border: 1px solid #1f1f1f; }

/* ── 10. REPO EXPLORER ───────────────────────────────────── */
.explorer-controls { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; margin-bottom: 20px; }
.search-input {
  flex: 1 1 320px; background: transparent; border: 0; border-bottom: 1px solid var(--silver-0);
  padding: 14px 0; font: 300 clamp(1.1rem, 2vw, 1.6rem)/1.2 var(--font-sans); letter-spacing: -0.02em; color: var(--silver-0); border-radius: 0;
}
.search-input:focus { outline: none; border-bottom-width: 2px; }
.search-input::placeholder { color: var(--silver-3); }
.count-badge { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--silver-3); }
.filter-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 28px; }
.filter-pill {
  font-family: var(--font-mono); font-size: .7rem; letter-spacing: .04em; text-transform: uppercase;
  padding: 9px 14px; background: transparent; color: var(--silver-2); border: 1px solid var(--silver-4);
  transition: all .15s ease;
}
.filter-pill:hover { border-color: var(--silver-0); color: var(--silver-0); }
.filter-pill.active { background: var(--silver-0); color: var(--bg); border-color: var(--silver-0); }

.repos-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  max-height: 880px; overflow-y: auto; border-top: 1px solid var(--silver-0); border-left: 1px solid var(--silver-4);
}
@media (max-width: 1000px) { .repos-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .repos-grid { grid-template-columns: 1fr; } }
.repos-grid::-webkit-scrollbar { width: 6px; }
.repos-grid::-webkit-scrollbar-track { background: var(--silver-5); }
.repos-grid::-webkit-scrollbar-thumb { background: var(--silver-3); }
.repo-card {
  padding: 24px; min-height: 190px; cursor: pointer; display: flex; flex-direction: column; justify-content: space-between; gap: 22px;
  border-right: 1px solid var(--silver-4); border-bottom: 1px solid var(--silver-4);
  transition: background .2s ease, color .2s ease;
}
.repo-card:hover { background: #000; color: #fff; }
.repo-card:hover .repo-desc, .repo-card:hover .repo-foot, .repo-card:hover .repo-foot span { color: #a8a8a8 !important; }
.repo-name { display: flex; align-items: center; gap: 8px; font-size: 1.1rem; font-weight: 400; letter-spacing: -0.02em; margin-bottom: 10px; word-break: break-word; }
.repo-desc { font-size: .88rem; line-height: 1.55; color: var(--silver-2); font-weight: 300;
  display: -webkit-box; -webkit-line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.repo-foot { display: flex; justify-content: space-between; align-items: center; font-family: var(--font-mono); font-size: .68rem; text-transform: uppercase; letter-spacing: .05em; color: var(--silver-3); }
.repo-lang-dot { display: inline-block; width: 7px; height: 7px; background: currentColor; margin-right: 8px; border-radius: 50%; }

/* ── 11. DATA VAULT ──────────────────────────────────────── */
.vault-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--silver-0); border-left: 1px solid var(--silver-4); }
@media (max-width: 900px) { .vault-grid { grid-template-columns: 1fr; } }
.vault-card { padding: clamp(24px, 3vw, 44px); display: flex; flex-direction: column; justify-content: space-between; gap: 32px;
  border-right: 1px solid var(--silver-4); border-bottom: 1px solid var(--silver-4); }
.vault-label { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; color: var(--silver-3); margin-bottom: 18px; }
.vault-title { font-size: clamp(1.8rem, 3vw, 2.8rem); font-weight: 300; letter-spacing: -0.045em; line-height: 1; margin-bottom: 20px; }
.vault-desc { color: var(--silver-2); font-weight: 300; line-height: 1.65; margin-bottom: 20px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 22px; }
.vault-stat { display: inline-block; margin-right: 22px; font-family: var(--font-mono); font-size: .72rem; color: var(--silver-3); text-transform: uppercase; letter-spacing: .04em; }
.vault-stat strong { color: var(--silver-0); font-weight: 500; }

/* ── 12. ABOUT ───────────────────────────────────────────── */
.about-headline { font-size: clamp(2rem, 5.4vw, 5.6rem); font-weight: 300; letter-spacing: -0.05em; line-height: 1;
  max-width: 20ch; margin-bottom: clamp(40px, 6vw, 96px); }
.about-grid { display: grid; grid-template-columns: 7fr 5fr; gap: clamp(32px, 6vw, 112px); align-items: start; }
@media (max-width: 900px) { .about-grid { grid-template-columns: 1fr; } }
.about-text p { color: var(--silver-2); font-weight: 300; font-size: 1.08rem; line-height: 1.75; margin-bottom: 22px; }
.about-text strong { color: var(--silver-0); font-weight: 500; }
.stats-block { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--silver-0); border-left: 1px solid var(--silver-4); }
.stat-item { padding: 28px 20px 28px 24px; border-right: 1px solid var(--silver-4); border-bottom: 1px solid var(--silver-4); }
.stat-num { font-size: clamp(2.2rem, 4vw, 3.8rem); font-weight: 300; letter-spacing: -0.05em; line-height: 1; margin-bottom: 12px; }
.stat-label { font-family: var(--font-mono); font-size: .66rem; letter-spacing: .07em; text-transform: uppercase; color: var(--silver-3); line-height: 1.5; }

/* ── 13. CONTACT (ruled rows) ────────────────────────────── */
.contact-grid { border-top: 1px solid var(--silver-0); }
.contact-card {
  display: grid; grid-template-columns: 200px minmax(0,1.4fr) minmax(0,1.6fr) 190px; gap: 8px 32px; align-items: baseline;
  padding: 26px 0; border-bottom: 1px solid var(--silver-4); transition: padding .25s ease, background .25s ease;
}
.contact-card > div:first-child { display: contents; }
.contact-platform { font-family: var(--font-mono); font-size: .68rem; letter-spacing: .08em; text-transform: uppercase; color: var(--silver-3); order: 1; }
.contact-name { font-size: clamp(1.5rem, 2.6vw, 2.4rem); font-weight: 300; letter-spacing: -0.04em; line-height: 1.05; order: 2; }
.contact-handle { font-family: var(--font-mono); font-size: .76rem; color: var(--silver-2); order: 3; }
.contact-desc { display: none; }
.contact-arrow { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .04em; text-transform: uppercase; color: var(--silver-3); white-space: nowrap; order: 4; transition: transform .25s ease, color .2s ease; }
.contact-card:hover { padding-left: 14px; background: var(--bg-1); }
.contact-card:hover .contact-arrow { color: var(--silver-0); transform: translateX(-6px); }
@media (max-width: 800px) {
  .contact-card { grid-template-columns: 1fr auto; }
  .contact-platform { grid-column: 1 / -1; }
  .contact-handle { grid-column: 1 / -1; order: 5; }
}

/* ── 14. FOOTER (black) ──────────────────────────────────── */
.footer { background: #000; color: #fff; padding: clamp(56px, 8vw, 120px) 0 28px; position: relative; z-index: 1;
  --silver-3: #747474; --silver-2: #a8a8a8; --silver-4: #2a2a2a; }
.footer-cta { display: block; font-size: clamp(2.6rem, 9vw, 9rem); font-weight: 300; letter-spacing: -0.06em; line-height: .92;
  margin-bottom: clamp(48px, 7vw, 110px); }
.footer-cta span { display: block; color: #6e6e6e; transition: color .2s ease; }
.footer-cta:hover span { color: #fff; }
.footer-inner { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 32px;
  padding-top: 28px; border-top: 1px solid #2a2a2a; }
.footer-brand { font-size: 1.2rem; font-weight: 500; letter-spacing: -0.02em; margin-bottom: 8px; }
.footer-brand sup { opacity: .6; }
.footer-tagline { font-family: var(--font-mono); font-size: .7rem; letter-spacing: .05em; text-transform: uppercase; color: #8a8a8a; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 26px; }
.footer-links a { font-family: var(--font-mono); font-size: .72rem; letter-spacing: .05em; text-transform: uppercase; color: #a8a8a8; transition: color .15s ease; }
.footer-links a:hover { color: #fff; }
.footer-copy { margin-top: 40px; font-family: var(--font-mono); font-size: .66rem; letter-spacing: .04em; color: #6a6a6a; }

/* ── 15. SUBPAGE HEADER ──────────────────────────────────── */
.page-header { background: #000; color: #fff; padding: clamp(56px, 8vw, 120px) 0 clamp(36px, 5vw, 64px);
  margin-top: var(--nav-h); position: relative; z-index: 1;
  --silver-0: #fff; --silver-1: #e6e6e6; --silver-2: #a8a8a8; --silver-3: #747474; --silver-4: #2a2a2a; }
.ph-breadcrumb { font-family: var(--font-mono); font-size: .7rem; color: var(--silver-3); text-transform: uppercase; letter-spacing: .1em; margin-bottom: 28px; }
.ph-breadcrumb a { color: var(--silver-2); transition: color .15s ease; }
.ph-breadcrumb a:hover { color: #fff; }
.ph-title { font-size: clamp(2rem, 4.8vw, 4.4rem); font-weight: 300; line-height: 1; letter-spacing: -0.05em; margin-bottom: 24px; max-width: 26ch; overflow-wrap: anywhere; }
.ph-subtitle { font-size: clamp(1rem, 1.3vw, 1.2rem); color: var(--silver-2); line-height: 1.6; max-width: 720px; margin-bottom: 28px; font-weight: 300; }
.ph-meta-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; font-family: var(--font-mono); font-size: .72rem; color: var(--silver-3); }
.ph-tag { border-color: #2f2f2f; color: #a8a8a8; }
.ph-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 28px; }
.page-header .btn-primary { background: #fff; color: #000; border-color: #fff; }
.page-header .btn-primary:hover { background: transparent; color: #fff; }
.page-header .btn-secondary { color: #fff; border-color: #3a3a3a; }
.page-header .btn-secondary:hover { background: #fff; color: #000; border-color: #fff; }

/* ── 16. PAPER READER ────────────────────────────────────── */
.paper-reader { max-width: var(--paper-w); margin: 0 auto; padding: 64px 40px 120px; }
@media (max-width: 767px) { .paper-reader { padding: 40px 20px 80px; } }
.paper-reader h1 { font-size: clamp(1.9rem, 3.4vw, 2.8rem); font-weight: 300; letter-spacing: -0.04em; margin: 56px 0 18px; line-height: 1.1; }
.paper-reader h2 { font-size: clamp(1.4rem, 2.4vw, 1.9rem); font-weight: 400; letter-spacing: -0.03em; margin: 48px 0 16px; padding-top: 22px; border-top: 1px solid var(--silver-4); }
.paper-reader h3 { font-family: var(--font-mono); font-size: .76rem; font-weight: 500; margin: 28px 0 10px; text-transform: uppercase; letter-spacing: .08em; }
.paper-reader p { font-size: 1.04rem; color: var(--silver-2); line-height: 1.85; margin-bottom: 18px; font-weight: 300; }
.paper-reader ul, .paper-reader ol { padding-left: 22px; margin-bottom: 18px; color: var(--silver-2); font-size: 1rem; line-height: 1.8; list-style: revert; font-weight: 300; }
.paper-reader li { margin-bottom: 8px; }
.paper-reader strong { color: var(--silver-0); font-weight: 500; }

.theorem-block { border-left: 2px solid var(--silver-0); padding: 18px 22px; margin: 28px 0; background: var(--bg-1); }
.theorem-label { font-family: var(--font-mono); font-size: .68rem; color: var(--silver-3); text-transform: uppercase; letter-spacing: .1em; margin-bottom: 10px; }
.theorem-content { font-size: .98rem; color: var(--silver-1); line-height: 1.8; }
.math-block { padding: 20px 24px; background: var(--bg-1); border: 1px solid var(--silver-4); margin: 24px 0; overflow-x: auto; text-align: center; }
.algo-block { padding: 22px 26px; background: var(--bg-1); border: 1px solid var(--silver-4); margin: 28px 0; font-family: var(--font-mono); font-size: .8rem; color: var(--silver-1); line-height: 1.85; }
.algo-title { font-family: var(--font-mono); font-size: .74rem; font-weight: 600; color: var(--silver-0); text-transform: uppercase; letter-spacing: .06em; padding-bottom: 10px; margin-bottom: 14px; border-bottom: 1px solid var(--silver-4); }

.figure-frame { border: 1px solid var(--silver-4); overflow: hidden; margin: 36px 0; background: var(--paper); }
.figure-bar { display: flex; justify-content: space-between; align-items: center; padding: 10px 16px; border-bottom: 1px solid var(--silver-4);
  font-family: var(--font-mono); font-size: .68rem; text-transform: uppercase; letter-spacing: .05em; color: var(--silver-3); flex-wrap: wrap; gap: 8px; }
.figure-bar button, .figure-bar a { font-family: var(--font-mono); font-size: .68rem; color: var(--silver-3); background: none; border: none; text-transform: uppercase; letter-spacing: .05em; transition: color .15s ease; }
.figure-bar button:hover, .figure-bar a:hover { color: var(--silver-0); }
.figure-canvas { padding: 24px; background: #fff; display: flex; justify-content: center; align-items: center; }
.figure-img { max-width: 100%; max-height: 520px; object-fit: contain; cursor: zoom-in; }
.figure-img.inv { filter: none; }  /* figures are light-on-white now: no inversion */
.figure-caption { padding: 12px 16px; border-top: 1px solid var(--silver-4); font-family: var(--font-mono); font-size: .72rem; color: var(--silver-3); line-height: 1.6; }
.figure-caption strong { color: var(--silver-0); }

.data-table-wrap { margin: 32px 0; overflow-x: auto; border: 1px solid var(--silver-4); background: var(--paper); }
.table-title { padding: 10px 16px; font-family: var(--font-mono); font-size: .72rem; font-weight: 600; border-bottom: 1px solid var(--silver-4); background: var(--bg-1); }
.data-table { width: 100%; border-collapse: collapse; font-family: var(--font-mono); font-size: .76rem; }
.data-table th { padding: 10px 14px; border-bottom: 1px solid var(--silver-0); color: var(--silver-3); font-weight: 500; text-align: left; white-space: nowrap; text-transform: uppercase; font-size: .66rem; letter-spacing: .06em; }
.data-table td { padding: 9px 14px; border-bottom: 1px solid var(--silver-5); color: var(--silver-1); white-space: nowrap; }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--bg-1); color: var(--silver-0); }

.bibtex-block { padding: 18px; background: var(--bg-1); border: 1px solid var(--silver-4); font-family: var(--font-mono); font-size: .76rem; color: var(--silver-1); white-space: pre; overflow-x: auto; line-height: 1.7; }
.meta-box { padding: 20px 24px; border: 1px solid var(--silver-4); font-family: var(--font-mono); font-size: .78rem; line-height: 2; color: var(--silver-2); margin-bottom: 28px; background: var(--bg-1); }
.meta-row { display: flex; flex-wrap: wrap; gap: 8px 16px; }
.meta-key { color: var(--silver-3); white-space: nowrap; }
.meta-val { color: var(--silver-0); flex: 1; }
.meta-val a { border-bottom: 1px solid var(--silver-4); }
.meta-val a:hover { border-color: var(--silver-0); }

/* ── 17. REPO / HUB DETAIL ───────────────────────────────── */
.repo-section { margin-bottom: 48px; padding-bottom: 48px; border-bottom: 1px solid var(--silver-4); }
.repo-section:last-child { border-bottom: none; }
.rs-title { font-family: var(--font-mono); font-size: .72rem; color: var(--silver-3); text-transform: uppercase; letter-spacing: .12em; margin-bottom: 16px; }
.rs-body { font-size: 1rem; color: var(--silver-2); line-height: 1.8; font-weight: 300; }
.tech-pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.repo-stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--silver-4); margin: 24px 0; border: 1px solid var(--silver-4); }
@media (max-width: 639px) { .repo-stats-row { grid-template-columns: repeat(2, 1fr); } }
.rs-stat { background: var(--paper); padding: 22px 16px; text-align: left; }
.rs-stat-num { font-size: 2rem; font-weight: 300; letter-spacing: -0.04em; margin-bottom: 4px; }
.rs-stat-lbl { font-family: var(--font-mono); font-size: .66rem; color: var(--silver-3); text-transform: uppercase; letter-spacing: .06em; }

/* ── 18. MODAL / LIGHTBOX ────────────────────────────────── */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,.72); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  z-index: 5000; display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: opacity .2s ease; padding: 24px; }
.modal-overlay.open { opacity: 1; pointer-events: auto; }
.modal-box { background: var(--paper); color: var(--silver-0); max-width: 680px; width: 100%; max-height: 90vh; overflow-y: auto; padding: 32px; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; padding-bottom: 14px; border-bottom: 1px solid var(--silver-4); }
.modal-header span { font-family: var(--font-display) !important; font-weight: 300 !important; letter-spacing: -0.03em; font-size: 1.6rem !important; }
.modal-close { font-family: var(--font-mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .05em; background: none; border: 1px solid var(--silver-4); color: var(--silver-2); padding: 6px 12px; transition: all .15s ease; }
.modal-close:hover { border-color: var(--silver-0); background: var(--silver-0); color: var(--bg); }

.lightbox { position: fixed; inset: 0; background: rgba(255,255,255,.97); z-index: 6000; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 32px; opacity: 0; pointer-events: none; transition: opacity .2s ease; cursor: zoom-out; }
.lightbox.open { opacity: 1; pointer-events: auto; }
.lb-img { max-width: 95vw; max-height: 82vh; object-fit: contain; }
.lb-caption { margin-top: 16px; font-family: var(--font-mono); font-size: .76rem; color: var(--silver-2); text-align: center; max-width: 720px; }

/* ── 19. REVEAL-ON-SCROLL ────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .8s ease, transform .8s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation: none !important; }
}

/* ── 20. PRINT ───────────────────────────────────────────── */
@media print {
  .navbar, .footer, .no-print, #ascii-hero { display: none !important; }
  body { background: #fff; }
}

.stat-name { font-size: clamp(1.1rem, 1.8vw, 1.5rem); font-weight: 300; letter-spacing: -0.03em; margin-top: 6px; word-break: break-word; }
.stats-block .stat-item { padding: 22px 24px; }

.page-header, .paper-reader, .repo-page-layout, .hub-layout, .essay-container { max-width: 100%; }
.paper-layout, .repo-split > *, .hub-split > * { min-width: 0; }
.paper-reader pre, .paper-reader table { max-width: 100%; }

.contact-arrow { text-align: right; }
@media (max-width: 800px) { .contact-card { grid-template-columns: 1fr auto; } .contact-arrow { text-align: right; } }
.paper-layout > * { min-width: 0; }
@media (max-width: 900px) { .paper-layout { grid-template-columns: minmax(0, 1fr) !important; } }
.related-repos h2 { font-weight: 300 !important; letter-spacing: -0.04em; font-size: clamp(1.8rem, 3.4vw, 3rem) !important; }
.related-repos { background: var(--paper); }

html { overflow-x: clip; }