/* Playful mathematics, with shared colors and styles across every page. */
:root {
  color-scheme: light;
  --ink: #172941;
  --text: #354356;
  --muted: #566578;
  --pink: #b82561;
  --purple: #7140ba;
  --blue: #086f9b;
  --green: #137651;
  --orange: #b85615;
  --line: #dce3ee;
  --paper: #fff;
  --accent: var(--pink);
  --tint: #fff1f6;
  --heading: 'Trebuchet MS', Arial, Helvetica, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font: 18px/1.75 Georgia, 'Times New Roman', serif;
  overflow-wrap: break-word;
}
.page-research { --accent: var(--purple); --tint: #f4efff; }
.page-teaching { --accent: var(--blue); --tint: #eaf7ff; }
.page-education { --accent: var(--green); --tint: #eaf8f0; }
p { margin: 0 0 20px; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 5px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; border-radius: 3px; }
.wrap { max-width: 1160px; margin: 0 auto; padding-inline: 36px; }
.site-header { background: #fff; border-bottom: 1px solid var(--line); }
.site-header::before {
  content: ''; display: block; height: 5px;
  background: linear-gradient(90deg,#d63b60 0 25%,#8752cc 25% 50%,#007ea8 50% 75%,#168563 75%);
}
.header-inner { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-block: 24px; }
.brand { display: flex; align-items: center; gap: 13px; text-decoration: none; color: var(--ink); }
.brand-mark {
  position: relative; display: grid; place-items: center; flex: 0 0 47px; height: 47px;
  font: bold 2rem/1 Georgia, serif; background: #fff1f6; border: 1px solid #efc5d8; border-radius: 14px;
  color: var(--pink); transform: rotate(-6deg);
}
.brand-mark > span { position: absolute; top: 0; right: 3px; font: bold 1rem/1 var(--heading); color: var(--purple); }
.brand-text { font: bold 1.2rem/1.25 var(--heading); }
.brand-text small { display: block; margin-top: 6px; color: var(--muted); font: .875rem/1.4 Arial, Helvetica, sans-serif; }
.site-header nav { display: flex; flex-wrap: wrap; gap: 5px; font: 1rem/1.4 var(--heading); }
.site-header nav a {
  display: flex; align-items: center; gap: 7px; min-height: 44px; padding: 10px 13px;
  color: var(--muted); border: 1px solid transparent; border-radius: 9px; text-decoration: none;
  transition: background .18s, color .18s, transform .18s;
}
.nav-symbol { font: bold 1.2rem/1 Georgia, serif; color: var(--pink); }
.site-header nav a:nth-child(2) .nav-symbol { color: var(--purple); }
.site-header nav a:nth-child(3) .nav-symbol { color: var(--blue); }
.site-header nav a:nth-child(4) .nav-symbol { color: var(--green); }
.site-header nav a:hover { color: var(--ink); background: #f3f5fa; transform: translateY(-2px); }
.site-header nav a[aria-current=page] { color: var(--accent); background: var(--tint); border-color: var(--tint); font-weight: bold; }
main.wrap { min-height: 65vh; padding-top: 62px; padding-bottom: 72px; animation: arrive .45s ease-out both; }
h1,h2,h3 { color: var(--ink); font-family: var(--heading); font-weight: bold; line-height: 1.15; }
h1 { font-size: clamp(3rem,6vw,4.8rem); margin: 12px 0 24px; letter-spacing: -.055em; }
h2 { font-size: 1.9rem; margin: 0 0 24px; letter-spacing: -.025em; }
h3 { font-size: 1.35rem; margin: 0 0 14px; letter-spacing: -.015em; }
.eyebrow { font: bold .875rem/1.6 var(--heading); letter-spacing: .09em; text-transform: uppercase; color: var(--accent); margin: 0 0 14px; }
.lead { font-size: 1.3rem; line-height: 1.55; max-width: 720px; }
.intro { display: grid; grid-template-columns: 1fr 1.06fr; gap: 65px; align-items: center; padding: 12px 0 24px; }
.intro h1 { font-size: clamp(4rem,6.5vw,5.5rem); line-height: 1.02; margin: 18px 0 26px; }
.intro h1 > span { display: block; color: var(--pink); }
.name-plus { display: inline-block; color: var(--purple); font-size: .62em; vertical-align: 25%; padding-left: 6px; transform: rotate(12deg); }
.primary-link {
  display: inline-flex; align-items: center; gap: 30px; min-height: 48px; margin-top: 8px; padding: 11px 20px;
  background: var(--ink); border: 1px solid var(--ink); border-radius: 9px; color: #fff;
  font: bold 1rem/1.5 var(--heading); text-decoration: none; box-shadow: 4px 4px 0 #ecc3d4;
  transition: transform .2s, box-shadow .2s;
}
.primary-link:hover { transform: translate(-2px,-2px); box-shadow: 6px 6px 0 #ecc3d4; }
.primary-link span { color: #f0a5c4; font-size: 1.4rem; line-height: 1; }
figure { margin: 0; }
.portrait { position: relative; padding: 14px 9px 0; }
.photo-link {
  display: block; position: relative; background: #fff; padding: 8px; border: 1px solid #cbd5e3; border-radius: 16px;
  box-shadow: 9px 9px 0 #e6ddfa; transform: rotate(2deg); transition: transform .3s, box-shadow .3s;
}
.photo-link:hover { transform: rotate(0deg); box-shadow: 6px 8px 0 #e6ddfa; }
.photo-link img { display: block; width: 100%; height: auto; border-radius: 9px; }
figcaption { font: .875rem/1.6 Arial, Helvetica, sans-serif; color: var(--muted); margin-top: 24px; padding-inline: 8px; }
.photo-symbol { position: absolute; z-index: 2; font: bold 2.3rem/1 Georgia, serif; user-select: none; pointer-events: none; }
.symbol-pi { left: -13px; top: -8px; color: var(--blue); transform: rotate(-13deg); }
.symbol-times { right: -13px; top: 55%; color: var(--pink); transform: rotate(12deg); }
.symbol-sum { right: 12px; top: -22px; color: var(--green); font-size: 1.8rem; transform: rotate(14deg); }
.about { max-width: 850px; margin-top: 48px; padding: 34px 38px 18px; border: 1px solid var(--line); border-left: 5px solid #cc3471; border-radius: 0 16px 16px 0; background: #fcfdff; }
.section-math { color: var(--pink); font-family: Georgia, serif; font-weight: normal; margin-right: 8px; }
.explore { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 24px; margin-top: 34px; }
.explore a {
  display: block; position: relative; background: #f5f0ff; border: 1px solid #ddd0f4; border-radius: 14px;
  padding: 24px; text-decoration: none; --card-accent: var(--purple); transition: transform .2s, box-shadow .2s;
}
.explore a:nth-child(2) { background: #edf8ff; border-color: #c6e3f2; --card-accent: var(--blue); }
.explore a:nth-child(3) { background: #eefaf3; border-color: #c8e9d6; --card-accent: var(--green); }
.explore a:hover { transform: translateY(-5px); box-shadow: 0 8px 0 #1729410d; }
.explore .explore-symbol { display: grid; place-items: center; width: 40px; height: 40px; background: var(--card-accent); color: #fff; border-radius: 10px; font: bold 1.6rem/1 Georgia,serif; margin-bottom: 20px; }
.explore strong { display: flex; justify-content: space-between; align-items: center; gap: 10px; font: bold 1.35rem/1.3 var(--heading); color: var(--ink); margin-bottom: 10px; }
.explore .card-arrow { color: var(--card-accent); font-size: 1.4rem; }
.explore a > span:last-child { display: block; font: 1rem/1.65 Arial,Helvetica,sans-serif; color: var(--text); }
.page-heading { position: relative; padding: 36px 160px 30px 36px; background: var(--tint); border-radius: 18px; margin-bottom: 46px; }
.page-heading h1 { color: var(--accent); }
.page-heading .lead { margin-bottom: 4px; max-width: 780px; }
.page-symbol { position: absolute; right: 44px; top: 48px; color: var(--accent); font: normal 6.5rem/1 Georgia,serif; transform: rotate(-9deg); user-select: none; pointer-events: none; }
.content-grid { display: grid; grid-template-columns: 200px minmax(0,1fr); gap: 40px; padding-top: 32px; margin-top: 32px; border-top: 1px solid var(--line); }
.section-label { font: bold 1rem/1.5 var(--heading); color: var(--accent); margin: 2px 0 0; }
.section-label::before { content: ''; display: block; width: 28px; height: 4px; background: var(--accent); border-radius: 2px; margin-bottom: 13px; }
.content-grid article + article { border-top: 1px dashed #cbd5e3; padding-top: 28px; margin-top: 30px; }
.meta { font: 1rem/1.6 Arial,Helvetica,sans-serif; color: var(--muted); margin: 0 0 16px; }
.degree { position: relative; border-left: 2px solid #cee6d8; padding-left: 30px; padding-bottom: 26px; }
.degree::before { content: ''; position: absolute; top: 5px; left: -8px; width: 14px; height: 14px; background: var(--green); border: 3px solid #fff; border-radius: 50%; box-shadow: 0 0 0 1px #b1d9c3; }
.degree:last-child { padding-bottom: 0; }
.degree h2 { font-size: 1.5rem; margin-bottom: 12px; }
.degree .qualification { font-size: 1.2rem; margin-bottom: 10px; }
ul { padding-left: 24px; }
li { padding-left: 5px; margin-bottom: 10px; }
li::marker { color: var(--accent); }
.site-footer { border-top: 1px solid var(--line); background: #f8faff; font: .875rem/1.6 Arial,Helvetica,sans-serif; color: var(--muted); }
.footer-inner { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 18px; padding-block: 26px; }
.footer-inner p { margin: 0; }
.footer-symbols { display: inline-flex; gap: 10px; margin-right: 16px; font: bold 1.25rem/1 Georgia,serif; vertical-align: middle; }
.footer-symbols b:nth-child(1) { color: var(--pink); }
.footer-symbols b:nth-child(2) { color: var(--blue); }
.footer-symbols b:nth-child(3) { color: var(--purple); }
.footer-symbols b:nth-child(4) { color: var(--green); }
.skip-link { position: absolute; top: 10px; left: 10px; transform: translateY(-200%); background: white; padding: 10px 16px; z-index: 10; }
.skip-link:focus { transform: none; }
@keyframes arrive { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
/* Click decoration stays outside the layout and never captures input. */
.math-burst-layer { position: fixed; inset: 0; overflow: hidden; pointer-events: none; z-index: 9999; user-select: none; }
.math-burst-symbol { position: absolute; display: block; line-height: 1; font-family: Georgia,'Times New Roman',serif; font-weight: bold; pointer-events: none; }
@media (max-width: 1000px) {
  .header-inner { align-items: flex-start; flex-direction: column; gap: 18px; }
  .intro { gap: 35px; }
  .intro h1 { font-size: 4.5rem; }
}
@media (max-width: 760px) {
  .intro { grid-template-columns: 1fr; gap: 42px; }
  .intro figure { width: 100%; max-width: 580px; }
  .intro h1 { font-size: 4.8rem; }
  .intro h1 > span { display: inline; }
  .content-grid { grid-template-columns: 1fr; gap: 16px; }
  .page-heading { padding: 28px 90px 28px 24px; }
  .page-symbol { font-size: 3.5rem; right: 22px; top: 40px; }
  .explore { gap: 16px; }
  .explore a { padding: 20px; }
  .explore strong { font-size: 1.1rem; }
}
@media (max-width: 560px) {
  .wrap { padding-inline: 22px; }
  main.wrap { padding-top: 34px; padding-bottom: 44px; }
  .header-inner { padding-block: 20px; }
  .brand-text small { font-size: .875rem; }
  .site-header nav { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); width: 100%; gap: 5px; }
  .site-header nav a { justify-content: center; padding: 8px; font-size: .875rem; gap: 6px; }
  .nav-symbol { font-size: 1rem; }
  .intro { padding-top: 0; }
  .intro h1 { font-size: clamp(3.3rem,12vw,4.5rem); }
  .lead { font-size: 1.2rem; }
  .about { margin-top: 38px; padding: 26px 22px 10px; }
  .about h2 { font-size: 1.65rem; }
  .explore { grid-template-columns: 1fr; gap: 18px; }
  .explore a { padding: 22px; }
  .explore strong { font-size: 1.35rem; }
  .explore .explore-symbol { margin-bottom: 16px; }
  .page-heading { padding: 24px; margin-bottom: 32px; }
  .page-heading h1 { font-size: clamp(2.65rem,11vw,3.2rem); }
  .page-symbol { position: static; float: right; font-size: 2.4rem; margin: -6px -5px 4px 14px; }
  .page-heading .lead { clear: both; }
  .photo-symbol { font-size: 1.8rem; }
  .symbol-pi { left: -5px; }
  .symbol-times { right: -5px; }
  .footer-inner { align-items: flex-start; flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,*::before,*::after { animation: none !important; transition: none !important; }
  .site-header nav a:hover,.explore a:hover,.primary-link:hover { transform: none; }
  .photo-link,.photo-link:hover { transform: none; }
  .math-burst-layer { display: none; }
}
@media print {
  .site-header,.site-footer,.skip-link,.explore,.photo-symbol,.page-symbol,.math-burst-layer { display: none; }
  main.wrap { padding: 0; animation: none; }
  .wrap { max-width: none; padding: 0; }
  body { font-size: 12pt; }
  .intro { grid-template-columns: 1fr 1fr; gap: 24px; }
  .intro h1 { font-size: 2.5rem; }
  .photo-link { transform: none; box-shadow: none; }
  .page-heading,.about { background: none; border: 0; padding: 0; }
  a { color: inherit; }
  .content-grid { grid-template-columns: 1fr; gap: 10px; }
  .degree,article { break-inside: avoid; }
}