/* ──────────────────────────────────────────────────────────────
   Anmol Rao — personal site
   Palette: pastel peach, sage, blush on warm off-white paper.
   Type: Fraunces (Tiempos-inspired serif) + Inter + JetBrains Mono.
   ────────────────────────────────────────────────────────────── */

/* ─── Self-hosted fonts ─────────────────────────────────────── */
@font-face {
  font-family: 'Fraunces';
  font-style: italic;
  font-weight: 300 500;
  font-display: swap;
  src: url('fonts/fraunces-italic.woff2') format('woff2');
}
@font-face {
  font-family: 'Fraunces';
  font-style: normal;
  font-weight: 300 600;
  font-display: swap;
  src: url('fonts/fraunces.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 300 600;
  font-display: swap;
  src: url('fonts/inter.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400 500;
  font-display: swap;
  src: url('fonts/jetbrains-mono.woff2') format('woff2');
}

:root {
  /* Light theme — warm paper + pastel accents */
  --bg:         #FBF7F4;
  --bg-soft:   #F5EEE6;
  --surface:    #FFFFFFCC;
  --surface-solid: #FFFFFF;
  --border:     #E8DED2;
  --border-soft:#F0E6DA;

  --text:       #2A2420;
  --text-muted: #6B5F55;
  --text-soft:  #8B7E73;

  --accent:     #D77A54;      /* terracotta / peach */
  --accent-soft:#F4C2A1;
  --accent-bg:  #FBE5D5;
  --sage:       #6B8B6A;
  --sage-soft:  #A8C5A1;
  --sage-bg:    #E4EEDE;
  --blush:      #C76A7E;
  --blush-soft: #E8A8B8;
  --blush-bg:   #F5DCE3;

  --ink:        #2A2420;       /* same as text but semantic */
  --link:       #B85B36;
  --link-hover: #D77A54;

  --shadow-sm: 0 1px 2px rgba(60, 40, 30, 0.04);
  --shadow:    0 2px 16px -4px rgba(60, 40, 30, 0.08);
  --shadow-lg: 0 20px 50px -20px rgba(60, 40, 30, 0.18);

  --serif: "Fraunces", "Tiempos Text", "Source Serif Pro", Georgia, serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono:  "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  --radius-sm: 6px;
  --radius:    10px;
  --radius-lg: 18px;

  --container: 760px;
  --container-wide: 980px;

  color-scheme: light;
}

[data-theme="dark"] {
  --bg:            #0E1117;
  --bg-soft:       #151B24;
  --surface:       #1B2333AA;
  --surface-solid: #1B2333;
  --border:        #28354A;
  --border-soft:   #20293A;

  --text:       #E8EBF2;
  --text-muted: #AEBAC8;
  --text-soft:  #7A8EA0;

  --accent:     #E8926C;
  --accent-soft:#E8926C;
  --accent-bg:  #2A1E18;
  --sage:       #96BF94;
  --sage-soft:  #96BF94;
  --sage-bg:    #182A20;
  --blush:      #DC9AAC;
  --blush-soft: #DC9AAC;
  --blush-bg:   #2A1A24;

  --link:       #E8926C;
  --link-hover: #F5B49A;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow:    0 2px 16px -4px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 20px 50px -20px rgba(0, 0, 0, 0.5);

  color-scheme: dark;
}

/* ─── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "ss01", "ss02";
  transition: background-color .4s ease, color .4s ease;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Page-wide animated gradient backdrop (sits behind EVERYTHING) */
.page-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.55;
}
[data-theme="dark"] .page-bg { opacity: 0.4; }
.page-bg canvas { width:100%; height:100%; display:block; }

.shell { position: relative; z-index: 1; }
img, svg { display: block; max-width: 100%; }
a { color: var(--link); text-decoration: none; border-bottom: 1px solid color-mix(in oklab, var(--link) 30%, transparent); transition: color .15s, border-color .15s; }
a:hover { color: var(--link-hover); border-bottom-color: var(--link-hover); }
p { text-wrap: pretty; }

/* ─── Layout shell ───────────────────────────────────────────── */
.shell {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}
.container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 28px;
}

/* ─── Header / nav ──────────────────────────────────────────── */
.site-header {
  padding: 28px 0 20px;
  position: absolute;
  top: 0; left: 0; right: 0;
  z-index: 10;
  background: transparent;
}
main { position: relative; z-index: 1; }
.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--text);
  border-bottom: none;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}
.brand:hover { color: var(--accent); }
.brand-dot {
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-1px);
}
nav.primary {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: var(--sans);
  font-size: 14px;
}
nav.primary a {
  padding: 6px 12px;
  border-radius: 100px;
  border-bottom: none;
  color: var(--text-muted);
  font-weight: 450;
}
nav.primary a:hover { color: var(--text); background: color-mix(in oklab, var(--bg-soft) 70%, transparent); }
nav.primary a.current {
  color: var(--text);
  background: color-mix(in oklab, var(--surface-solid) 75%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: var(--shadow-sm);
}
[data-theme="dark"] nav.primary a.current {
  background: color-mix(in oklab, var(--bg-soft) 70%, transparent);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  width: 34px; height: 34px;
  border-radius: 50%;
  align-items: center; justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  transition: all .2s;
}
.nav-toggle:hover { color: var(--text); border-color: var(--text-muted); }
.nav-toggle svg { width: 14px; height: 14px; }

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  width: 34px; height: 34px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  transition: all .2s;
  margin-left: 8px;
  flex-shrink: 0;
}
.theme-toggle:hover { color: var(--text); border-color: var(--text-muted); transform: rotate(20deg); }
.theme-toggle svg { width: 14px; height: 14px; }

/* ─── Hero / page headers ───────────────────────────────────── */
.hero {
  padding: 140px 0 96px;
  position: relative;
  overflow: hidden;
}
.hero > .container { position: relative; z-index: 1; }
.hero h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(40px, 6vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  margin-bottom: 18px;
}
.hero h1 em {
  font-style: italic;
  font-weight: 300;
  color: var(--accent);
}
.hero .tagline {
  font-family: var(--serif);
  font-size: 22px;
  line-height: 1.5;
  color: var(--text-muted);
  max-width: 580px;
  margin-bottom: 28px;
  font-weight: 300;
}
.hero .bio {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text);
  max-width: 620px;
}
.hero .bio p + p {
  margin-top: 0.75em !important;
}

.page-header {
  padding: 120px 0 36px;
}
.page-eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.page-eyebrow::before {
  content: "";
  display: inline-block;
  width: 20px;
  height: 1px;
  background: var(--text-soft);
}
.page-title {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(34px, 5vw, 46px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}
.page-sub {
  font-family: var(--serif);
  font-size: 19px;
  color: var(--text-muted);
  max-width: 620px;
  font-weight: 300;
  line-height: 1.55;
}

/* ─── Sections ──────────────────────────────────────────────── */
section { padding: 28px 0 48px; }
.section-label {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border-soft);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.section-label .count {
  font-family: var(--mono);
  color: var(--text-soft);
  font-size: 11px;
}

/* Cards now need transparent backgrounds so the page-bg shows */
.card, .paper, .post-row { background: transparent; }
/* ─── Cards (used for research, experience, etc.) ──────────── */
.card {
  padding: 22px 0 24px;
  border-bottom: 1px solid var(--border-soft);
}
.card:last-child { border-bottom: none; }
.card-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.card-title {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.card-meta {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-soft);
  white-space: nowrap;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
.card-sub {
  font-family: var(--serif);
  font-style: italic;
  color: var(--text-muted);
  font-size: 16px;
  margin-bottom: 10px;
  font-weight: 300;
}
.card ul {
  list-style: none;
  padding: 0;
  margin-top: 10px;
}
.card ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 8px;
  font-size: 16.5px;
  line-height: 1.6;
  color: var(--text);
}
.card ul li::before {
  content: "";
  position: absolute;
  left: 2px; top: 12px;
  width: 8px; height: 1px;
  background: var(--accent);
}
.card ul li strong { font-weight: 600; color: var(--text); }

/* ─── Paper entries ────────────────────────────────────────── */
.paper {
  padding: 20px 0;
  border-bottom: 1px solid var(--border-soft);
}
.paper:last-child { border-bottom: none; }
.paper-title {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.005em;
  margin-bottom: 6px;
}
.paper-authors {
  font-size: 15px;
  color: var(--text-muted);
  margin-bottom: 4px;
  line-height: 1.5;
}
.paper-authors .me { color: var(--text); font-weight: 500; }
.paper-venue {
  font-family: var(--serif);
  font-style: italic;
  font-size: 14.5px;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.paper-note { font-family: var(--mono); font-size: 11.5px; color: var(--text-soft); margin-left: 8px; }
.paper-links {
  display: flex; gap: 8px; flex-wrap: wrap;
  margin-top: 8px;
}
.chip {
  font-family: var(--mono);
  font-size: 11.5px;
  padding: 3px 10px;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  letter-spacing: 0.02em;
  transition: all .15s;
}
a.chip { border-bottom-color: var(--border); }
a.chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-bg);
}

/* ─── Writing list ─────────────────────────────────────────── */
.post-row {
  display: block;
  padding: 22px 0;
  border-bottom: 1px solid var(--border-soft);
  border-top: none;
  color: inherit;
}
.post-row:hover { border-bottom-color: var(--accent); }
.post-row:hover .post-title { color: var(--accent); }
.post-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 6px;
}
.post-title {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.3;
  transition: color .15s;
}
.post-date {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-soft);
  white-space: nowrap;
  flex-shrink: 0;
}
.post-summary {
  font-family: var(--serif);
  font-size: 16.5px;
  color: var(--text-muted);
  line-height: 1.55;
  font-weight: 300;
  margin-bottom: 8px;
}
.post-foot {
  display: flex;
  gap: 10px;
  align-items: center;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--text-soft);
}
.post-foot .tag {
  padding: 2px 8px;
  border-radius: 100px;
  background: var(--bg-soft);
}

/* ─── Footer ───────────────────────────────────────────────── */
.site-footer {
  margin-top: auto;
  padding: 56px 0 40px;
  border-top: 1px solid var(--border-soft);
  font-family: var(--sans);
  font-size: 13.5px;
  color: var(--text-soft);
}
.footer-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-row a { color: var(--text-muted); border-bottom-color: transparent; }
.footer-row a:hover { color: var(--accent); }
.footer-eqn {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-soft);
  opacity: .65;
  letter-spacing: 0.03em;
  margin-top: 16px;
}

/* ─── Math-gradient background (hero easter egg) ──────────── */
.math-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  opacity: 0;
}
.math-bg canvas { width: 100%; height: 100%; display: block; }

/* ─── Contact strip ────────────────────────────────────────── */
.contact {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 28px;
  font-family: var(--sans);
  font-size: 14px;
}
.contact a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-muted);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.contact a:hover { color: var(--accent); border-bottom-color: var(--accent); }
.contact .sep { color: var(--text-soft); }

/* ─── Mobile ───────────────────────────────────────────────── */
@media (max-width: 720px) {
  body { font-size: 16.5px; }
  .container, .container-wide { padding: 0 20px; }

  .site-header { padding: 18px 0 14px; }
  .nav-row { gap: 8px; }
  .brand { font-size: 15px; }
  .brand-dot { width: 6px; height: 6px; }

  /* Collapse nav into a menu */
  .nav-toggle { display: inline-flex; }
  nav.primary {
    position: fixed;
    top: 62px; right: 16px; left: 16px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 14px;
    background: var(--surface-solid);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 50;
    display: none;
  }
  nav.primary.open { display: flex; }
  nav.primary a { padding: 10px 14px; font-size: 15px; }
  nav.primary a.current { background: var(--bg-soft); }
  .theme-toggle { margin-left: 0; align-self: flex-start; }

  .hero { padding: 110px 0 64px; }
  .hero h1 { font-size: clamp(36px, 12vw, 48px); }
  .hero .tagline { font-size: 18px; }
  .hero .bio { font-size: 16.5px; }

  .page-header { padding: 100px 0 24px; }
  .page-title { font-size: clamp(28px, 8vw, 36px); }
  .page-sub { font-size: 17px; }

  section { padding: 20px 0 36px; }

  .card-head, .post-head { flex-direction: column; gap: 4px; }
  .card-meta, .post-date { order: -1; font-size: 11px; }
  .card-title { font-size: 19px; }
  .post-title { font-size: 19px; }
  .paper-title { font-size: 17.5px; }
  .card ul li { font-size: 15.5px; }

  .contact { gap: 14px; font-size: 13.5px; }

  .footer-row { flex-direction: column; gap: 8px; align-items: flex-start; }
  .footer-eqn { font-size: 10.5px; word-break: break-word; }
  #name-eqn { white-space: normal; }

  /* Blog post pages */
  .post-wrap { padding: 0 20px; }
  #post-body { font-size: 17px; }
  .post-masthead { padding: 10px 0 28px; margin-bottom: 28px; }
  .post-masthead h1 { font-size: clamp(26px, 8vw, 34px); }
  .post-masthead .post-sub { font-size: 16px; }
}

@media (max-width: 420px) {
  .hero h1 { letter-spacing: -0.03em; }
  .page-eyebrow { font-size: 11px; }
  nav.primary { top: 56px; }
}

/* ─── Tiny touches ─────────────────────────────────────────── */
::selection { background: var(--accent-bg); color: var(--text); }

/* Horizontal ornament */
.ornament {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  color: var(--text-soft);
  margin: 28px 0;
}
.ornament::before, .ornament::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border-soft);
  max-width: 60px;
}
.ornament-glyph {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  opacity: .6;
}

/* ─── Footer equation easter egg ─────────────────────────── */
#name-eqn {
  display: inline-block;
  padding: 4px 10px;
  margin-left: -10px;
  border-radius: 8px;
  transition: background .2s, color .2s;
  user-select: none;
  white-space: nowrap;
  font-style: normal;
}
#name-eqn:hover { background: var(--bg-soft); color: var(--text-muted); }
#name-eqn .eqn-piece { opacity: .7; }
#name-eqn #name-slot { color: var(--text); font-weight: 500; }

/* ─── Konami wild mode — gradient sped up + saturated ─── */
html.wild .math-bg { opacity: 1 !important; filter: saturate(1.4) hue-rotate(15deg); }
html.wild .hero h1 em { animation: wildshift 1s linear infinite; }
@keyframes wildshift {
  0% { filter: hue-rotate(0deg); }
  100% { filter: hue-rotate(360deg); }
}