/* Reset / base */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0ms !important; transition-duration: 0ms !important; }
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink-soft);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; height: auto; display: block; }

a { color: var(--ink); text-decoration: none; transition: color var(--transition); }
a:hover, a:focus { color: var(--accent-strong); }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--ink);
  margin: 0 0 0.6em;
  line-height: 1.2;
}

p { margin: 0 0 1em; }
ul, ol { margin: 0; padding: 0; list-style: none; }

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 12px 16px;
  z-index: 1000;
}
.skip-link:focus { left: 8px; top: 8px; }

/* Focus ring */
:focus-visible {
  outline: 3px solid var(--accent-1);
  outline-offset: 3px;
  border-radius: 4px;
}

/* Header / nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--rule);
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 24px;
}

.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.5px;
  color: var(--ink);
}
.brand span { font-weight: 300; }

.primary-nav ul {
  display: flex;
  gap: 28px;
  align-items: center;
}
.primary-nav a {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}
.primary-nav a:hover, .primary-nav a:focus { color: var(--accent-strong); }
.primary-nav .nav-cta {
  padding: 8px 20px;
  border: 1px solid var(--rule-strong);
  border-radius: var(--radius-pill);
}
.primary-nav .nav-cta:hover, .primary-nav .nav-cta:focus {
  background: var(--gradient);
  background-size: 200% auto;
  color: #fff;
  border-color: transparent;
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 8px;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  justify-content: center;
  align-items: center;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  transition: transform var(--transition), opacity var(--transition);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav-toggle { display: flex; }
  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: #fff;
    border-bottom: 1px solid var(--rule);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform var(--transition);
  }
  .primary-nav[data-open="true"] { transform: scaleY(1); }
  .primary-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 16px 24px 24px;
    align-items: flex-start;
  }
  .primary-nav li { width: 100%; }
  .primary-nav a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--rule);
    width: 100%;
  }
  .primary-nav .nav-cta { border: 0; padding: 12px 0; }
}

/* Hero */
.hero {
  position: relative;
  padding: 120px 0 100px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg svg { width: 100%; height: 100%; }
.hero-inner { position: relative; z-index: 1; max-width: 820px; }

.eyebrow {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin: 0 0 18px;
}

.hero h1 {
  font-size: clamp(40px, 6.2vw, 72px);
  font-weight: 400;
  letter-spacing: -0.5px;
  margin: 0 0 24px;
}
.hero h1 span {
  background: var(--gradient);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 500;
}

.hero-sub {
  font-size: clamp(17px, 1.6vw, 22px);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 640px;
  margin: 0 0 40px;
}

.hero-ctas { display: flex; flex-wrap: wrap; gap: 16px; }

/* Buttons */
.btn {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 14px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 0 36px;
  line-height: 52px;
  border-radius: var(--radius-pill);
  border: 0;
  cursor: pointer;
  transition: background-position var(--transition), color var(--transition), box-shadow var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn-primary {
  color: #fff;
  background: var(--gradient);
  background-size: 200% auto;
  box-shadow: 0 0 0 6px rgba(204, 241, 255, 0.45);
}
.btn-primary:hover, .btn-primary:focus {
  background-position: right center;
  color: #fff;
  transform: translateY(-1px);
}
.btn-ghost {
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--rule-strong);
}
.btn-ghost:hover, .btn-ghost:focus { border-color: var(--ink); color: var(--ink); transform: translateY(-1px); }

/* Sections */
.section {
  padding: var(--pad-section) 0;
}
.section-tint { background: var(--bg-tint); }

.section-head {
  text-align: center;
  margin: 0 auto 64px;
  max-width: 760px;
}
.section-head h2 {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 500;
  margin: 0 0 18px;
}
.section-head .rule {
  display: inline-block;
  width: 213px;
  max-width: 60%;
  height: 1px;
  background: var(--rule-strong);
  margin-top: 8px;
  position: relative;
}
.section-head .rule::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-1);
  transform: translate(-50%, -50%);
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
}
.about-prose p { font-size: 17px; }
.about-prose strong { color: var(--ink); font-weight: 600; }

.about-aside { padding: 32px; background: #fff; border-radius: var(--radius-card); box-shadow: var(--shadow-card); }
.section-tint .about-aside { background: var(--bg-tint); }
.about-aside .aside-title {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0 0 12px;
}
.about-aside .aside-title:not(:first-child) { margin-top: 24px; }
.about-aside .aside-text { color: var(--ink-soft); margin: 0; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips li {
  font-size: 13px;
  padding: 6px 14px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-pill);
  color: var(--ink);
  background: #fff;
}

/* Card grid (research areas) */
.card-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
@media (max-width: 1024px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px)  { .card-grid { grid-template-columns: 1fr; } }
.card {
  background: #fff;
  padding: var(--pad-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover { transform: translateY(-4px); box-shadow: 0 20px 48px rgba(0, 0, 0, 0.13); }
.card h3 { font-size: 20px; font-weight: 700; margin: 0 0 12px; }
.card p { margin: 0; }

/* Selected work */
.callout {
  margin: 0 auto 64px;
  max-width: 880px;
  padding: 40px 48px;
  background: #fff;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-callout);
  border-left: 4px solid;
  border-image: var(--gradient) 1;
  text-align: left;
}
.callout-eyebrow {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin: 0 0 16px;
}
.callout-quote {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.5;
  color: var(--ink);
  margin: 0 0 16px;
  font-weight: 400;
}
.callout-quote strong { font-weight: 700; }
.callout-source { font-size: 14px; margin: 0; color: var(--ink-soft); }

.work-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
@media (max-width: 768px) { .work-grid { grid-template-columns: 1fr; } }
.work-card {
  background: #fff;
  padding: var(--pad-card);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition);
}
.work-card:hover { transform: translateY(-4px); }
.work-meta {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin: 0 0 12px;
}
.work-card h3 { font-size: 20px; font-weight: 700; margin: 0 0 12px; line-height: 1.35; }
.work-source { font-size: 14px; margin: 12px 0 0; }

/* Timeline */
.timeline {
  position: relative;
  max-width: 820px;
  margin: 0 auto;
  padding-left: 32px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--rule-strong);
}
.timeline-item {
  position: relative;
  padding: 0 0 36px 24px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent-1);
  box-shadow: 0 0 0 4px var(--bg-tint);
}
.section:not(.section-tint) .timeline-item::before { box-shadow: 0 0 0 4px #fff; }
.timeline-dates {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin: 0 0 6px;
}
.timeline-item h3 { font-size: 19px; font-weight: 700; margin: 0 0 4px; }
.timeline-org { color: var(--ink); font-weight: 600; margin: 0 0 8px; }

/* Education */
.education-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 900px) { .education-list { grid-template-columns: 1fr; } }
.edu-card {
  padding: var(--pad-card);
  background: var(--bg-tint);
  border-radius: var(--radius-card);
}
.edu-dates {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin: 0 0 8px;
}
.edu-card h3 { font-size: 18px; font-weight: 700; margin: 0 0 6px; line-height: 1.35; }
.edu-org { color: var(--ink); font-weight: 600; margin: 0 0 10px; }

/* Writing */
.writing-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
@media (max-width: 900px) { .writing-cols { grid-template-columns: 1fr; } }
.writing-group {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-1);
  display: inline-block;
}
.writing-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}
.writing-list li:last-child { border-bottom: 0; }
.writing-title { color: var(--ink); font-weight: 600; margin: 0 0 4px; line-height: 1.4; }
.writing-meta { font-size: 13px; margin: 0; }

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  max-width: 720px;
  margin: 0 auto;
}
@media (max-width: 600px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-block {
  padding: 24px;
  border: 1px solid var(--rule);
  border-radius: var(--radius-card);
  background: #fff;
}
.contact-label {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin: 0 0 8px;
}
.contact-value { margin: 0; color: var(--ink); font-weight: 600; word-break: break-word; }

/* Footer */
.site-footer {
  background: var(--ink);
  color: #cdd2e2;
  padding: 32px 0;
}
.footer-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: #fff;
  margin: 0;
}
.footer-brand span { font-weight: 300; }
.footer-meta { margin: 0; font-size: 13px; }