:root {
  --navy: #00356b;
  --navy-deep: #002447;
  --blue: #286dc0;
  --blue-soft: #5b8fd4;
  --ink: #142033;
  --muted: #5c6b7a;
  --line: rgba(0, 53, 107, 0.14);
  --paper: #f4f7fb;
  --paper-warm: #eef3f8;
  --white: #ffffff;
  --accent-mist: rgba(40, 109, 192, 0.12);
  --shadow-soft: 0 18px 50px rgba(0, 36, 71, 0.08);
  --radius: 18px;
  --header-h: 4.25rem;
  --wrap: 1120px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "DM Sans", "Helvetica Neue", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 700px at 85% -10%, rgba(40, 109, 192, 0.18), transparent 55%),
    radial-gradient(900px 600px at -10% 20%, rgba(0, 53, 107, 0.1), transparent 50%),
    linear-gradient(180deg, #f7fafc 0%, var(--paper) 40%, var(--paper-warm) 100%);
  background-attachment: fixed;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--navy);
  color: var(--white);
  padding: 0.75rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.wrap {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header-h);
  backdrop-filter: blur(14px);
  background: rgba(244, 247, 251, 0.82);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, background 0.25s ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(244, 247, 251, 0.94);
}

.site-header__inner {
  width: min(100% - 2.5rem, var(--wrap));
  margin-inline: auto;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--navy);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.35rem;
}

.site-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: var(--navy);
}

.site-nav__cta {
  padding: 0.45rem 0.95rem;
  border: 1px solid var(--navy);
  color: var(--navy) !important;
  border-radius: 8px;
}

.site-nav__cta:hover {
  background: var(--navy);
  color: var(--white) !important;
}

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  padding: 0.4rem;
  cursor: pointer;
}

.nav-toggle__label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  display: block;
  width: 1.35rem;
  height: 2px;
  background: var(--navy);
  position: relative;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

/* Hero */
.hero {
  position: relative;
  min-height: calc(100vh - var(--header-h));
  display: grid;
  align-items: stretch;
  overflow: hidden;
  isolation: isolate;
}

.hero__atmosphere {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(105deg,
      rgba(244, 247, 251, 0.96) 0%,
      rgba(244, 247, 251, 0.9) 32%,
      rgba(244, 247, 251, 0.55) 48%,
      rgba(244, 247, 251, 0.18) 62%,
      rgba(244, 247, 251, 0.02) 78%,
      transparent 100%),
    radial-gradient(ellipse 55% 50% at 18% 30%, rgba(40, 109, 192, 0.14), transparent 70%);
  z-index: 1;
  pointer-events: none;
  animation: mistDrift 18s ease-in-out infinite alternate;
}

.hero__portrait {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 72% 16%;
}

.hero__grid {
  position: relative;
  z-index: 2;
  width: min(100% - 2.5rem, var(--wrap));
  margin: 0 auto;
  padding: clamp(3rem, 10vh, 6rem) 0;
  display: grid;
  grid-template-columns: minmax(0, 34rem) 1fr;
  align-items: center;
  min-height: calc(100vh - var(--header-h));
}

.hero__brand {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 4.6rem);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--navy);
}

.hero__headline {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.2vw, 1.45rem);
  font-weight: 500;
  font-style: italic;
  color: var(--blue);
}

.hero__support {
  margin: 0 0 1.75rem;
  max-width: 32rem;
  color: var(--muted);
  font-size: 1.08rem;
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.72rem 1.2rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--navy);
  color: var(--white);
  border: 1px solid var(--navy);
}

.btn--primary:hover {
  background: var(--navy-deep);
  color: var(--white);
}

.btn--ghost {
  background: rgba(244, 247, 251, 0.72);
  color: var(--navy);
  border: 1px solid rgba(0, 53, 107, 0.35);
}

.btn--ghost:hover {
  border-color: var(--navy);
  color: var(--navy);
  background: var(--white);
}

.hero.is-ready .hero__copy {
  animation: riseIn 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero.is-ready .hero__portrait {
  animation: portraitIn 1.1s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes mistDrift {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(-1.5%, 1%, 0) scale(1.03); }
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes portraitIn {
  from {
    opacity: 0;
    transform: scale(1.04);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

/* Sections */
.section {
  padding: clamp(3.5rem, 8vw, 6rem) 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section__eyebrow {
  margin: 0 0 0.65rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
}

.section__title {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3.5vw, 2.55rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--navy);
  line-height: 1.15;
}

.section__lede {
  margin: 0 0 2.25rem;
  max-width: 42rem;
  color: var(--muted);
}

.section__header {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.5rem;
}

.section__link {
  font-weight: 600;
  text-decoration: none;
  color: var(--navy);
  white-space: nowrap;
}

.section__link:hover {
  color: var(--blue);
}

/* Research pillars */
.pillar-list {
  display: grid;
  gap: 1.75rem;
}

.pillar {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  gap: 1.25rem;
  align-items: start;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
}

.pillar:first-child {
  border-top: 0;
  padding-top: 0;
}

.pillar__index {
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 600;
  color: var(--blue-soft);
  line-height: 1;
  padding-top: 0.35rem;
}

.pillar h3 {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--navy);
  letter-spacing: -0.02em;
}

.pillar p {
  margin: 0;
  color: var(--muted);
  max-width: 48rem;
}

/* Papers */
.paper-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.paper {
  padding: 1.35rem 0;
  border-top: 1px solid var(--line);
}

.paper:last-child {
  border-bottom: 1px solid var(--line);
}

.paper__meta {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue);
}

.paper__title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--navy);
}

.paper__title a {
  color: inherit;
  text-decoration: none;
}

.paper__title a:hover {
  color: var(--blue);
}

.paper__authors,
.paper__venue {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.paper__venue {
  margin-top: 0.2rem;
  font-style: italic;
}

.paper__badge {
  display: inline;
  font-style: normal;
  font-weight: 600;
  color: var(--navy);
}

/* News */
.news-list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
}

.news-item {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1.25rem;
  padding: 1.2rem 0;
  border-top: 1px solid var(--line);
  align-items: start;
}

.news-item:last-child {
  border-bottom: 1px solid var(--line);
}

.news-item__when {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--blue);
}

.news-item__body {
  margin: 0;
  color: var(--muted);
  max-width: 48rem;
}

/* Experience timeline */
.timeline {
  display: grid;
  gap: 1.5rem;
}

.timeline__item {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1.25rem;
  padding-top: 1.35rem;
  border-top: 1px solid var(--line);
}

.timeline__item:first-child {
  border-top: 0;
  padding-top: 0;
}

.timeline__when {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--blue);
}

.timeline__what h3 {
  margin: 0 0 0.25rem;
  font-size: 1.12rem;
  color: var(--navy);
}

.timeline__what p,
.timeline__what ul {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.timeline__what ul {
  padding-left: 1.1rem;
}

.timeline__org {
  font-style: italic;
}

/* Teaching / contact */
.split {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
}

.prose p {
  margin: 0 0 1rem;
  color: var(--muted);
  max-width: 40rem;
}

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

.download-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.contact-panel {
  padding: 1.75rem 0 0;
}

.contact-panel h3 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--navy);
}

.contact-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.contact-panel li {
  margin: 0.55rem 0;
}

.contact-panel a {
  font-weight: 600;
  text-decoration: none;
  color: var(--navy);
}

.contact-panel a:hover {
  color: var(--blue);
}

/* Inner pages */
.page-hero {
  padding: 3.5rem 0 2rem;
  border-bottom: 1px solid var(--line);
}

.page-hero .section__title {
  margin-bottom: 0.75rem;
}

.page-body {
  padding: 2.75rem 0 4rem;
}

.research-block {
  margin: 0 0 2.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
}

.research-block:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.research-block h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: 1.55rem;
  color: var(--navy);
}

.research-block p {
  margin: 0 0 1rem;
  color: var(--muted);
  max-width: 48rem;
}

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

.pub-group {
  margin: 0 0 2.5rem;
}

.pub-group h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
  color: var(--navy);
}

/* Reveal */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.75rem 0 3rem;
  background: rgba(255, 255, 255, 0.45);
}

.site-footer__brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--navy);
}

.site-footer__meta,
.site-footer__copy {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
  margin: 1rem 0 0;
}

.site-footer__links a {
  font-weight: 600;
  text-decoration: none;
  color: var(--navy);
}

.site-footer__links a:hover {
  color: var(--blue);
}

.site-footer__copy {
  margin-top: 1.5rem;
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 900px) {
  .split {
    grid-template-columns: 1fr;
  }

  .hero__atmosphere {
    background:
      linear-gradient(180deg, rgba(244, 247, 251, 0.55) 0%, rgba(244, 247, 251, 0.88) 48%, rgba(244, 247, 251, 0.97) 100%),
      radial-gradient(ellipse 70% 40% at 50% 0%, rgba(40, 109, 192, 0.14), transparent 70%);
  }

  .hero__portrait img {
    object-position: 60% 12%;
  }

  .hero__grid {
    grid-template-columns: 1fr;
    align-items: end;
    padding-bottom: 2.5rem;
  }

  .hero__brand,
  .hero__headline,
  .hero__support {
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
  }

  .timeline__item {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

@media (max-width: 720px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
  }

  .site-nav {
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.75rem 1.25rem 1.25rem;
    background: rgba(244, 247, 251, 0.98);
    border-bottom: 1px solid var(--line);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 0.8rem 0.2rem;
    border-bottom: 1px solid var(--line);
  }

  .site-nav__cta {
    margin-top: 0.65rem;
    text-align: center;
    border-radius: 8px;
  }

  .pillar {
    grid-template-columns: 3rem 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero__atmosphere { animation: none; }
  .hero.is-ready .hero__copy,
  .hero.is-ready .hero__portrait,
  .reveal {
    animation: none;
    opacity: 1;
    transform: none;
    transition: none;
  }
}