:root {
  color-scheme: light;
  --ink: #17212b;
  --muted: #5e6873;
  --paper: #fbfaf7;
  --surface: #ffffff;
  --line: #dfe4e2;
  --teal: #176f73;
  --amber: #b76f28;
  --coral: #b94b4a;
  --soft: #eef3f1;
  --shadow: 0 20px 60px rgba(23, 33, 43, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(251, 250, 247, 0.88);
  border-bottom: 1px solid rgba(223, 228, 226, 0.9);
  backdrop-filter: blur(18px);
}

.brand,
.nav-links,
.hero-actions,
.contact-links,
.site-footer {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  width: 36px;
  height: 36px;
  place-items: center;
  color: #fff;
  background: var(--ink);
  border-radius: 8px;
  font-size: 0.78rem;
  letter-spacing: 0;
}

.nav-links {
  gap: clamp(12px, 2.4vw, 28px);
  color: var(--muted);
  font-size: 0.95rem;
}

.nav-links a {
  text-decoration: none;
}

.nav-links a:hover,
.contact-links a:hover,
.site-footer a:hover {
  color: var(--teal);
}

.hero {
  position: relative;
  min-height: min(760px, 92vh);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #fff;
  background: #17212b;
}

.hero-media {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(12, 18, 24, 0.96) 0%, rgba(12, 18, 24, 0.76) 42%, rgba(12, 18, 24, 0.24) 100%),
    linear-gradient(0deg, rgba(12, 18, 24, 0.72) 0%, rgba(12, 18, 24, 0.02) 46%),
    url("assets/research-hero.png") center / cover;
  transform: scale(1.01);
}

.hero-inner {
  position: relative;
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
  padding: 120px 0 96px;
}

.eyebrow,
.section-kicker,
.date,
.tag {
  margin: 0;
  color: var(--amber);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #f1b36a;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 20px;
  font-size: clamp(4rem, 11vw, 9.5rem);
  line-height: 0.88;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: clamp(2rem, 4.5vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.1rem;
  line-height: 1.25;
}

.hero-copy {
  max-width: 650px;
  margin-bottom: 30px;
  color: rgba(255, 255, 255, 0.84);
  font-size: clamp(1.12rem, 2vw, 1.45rem);
}

.hero-actions {
  gap: 12px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border: 1px solid rgba(255, 255, 255, 0.38);
  border-radius: 8px;
  color: #fff;
  text-decoration: none;
  font-weight: 750;
  background: rgba(255, 255, 255, 0.08);
}

.button.primary {
  color: var(--ink);
  background: #fff;
  border-color: #fff;
}

.section-pad {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto;
  padding: clamp(64px, 10vw, 120px) 0;
}

.intro,
.split {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(280px, 1.1fr);
  gap: clamp(32px, 7vw, 90px);
}

.intro p:last-child,
.split > p,
.feature-list p,
.timeline p,
.education-list p,
.experience-grid p {
  color: var(--muted);
}

.intro > p {
  margin-bottom: 0;
  font-size: 1.08rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.stats div {
  padding: clamp(24px, 5vw, 44px) clamp(18px, 4vw, 54px);
  border-right: 1px solid var(--line);
}

.stats div:last-child {
  border-right: 0;
}

.stats strong {
  display: block;
  margin-bottom: 8px;
  color: var(--teal);
  font-size: clamp(1.8rem, 5vw, 4rem);
  line-height: 1;
}

.stats span {
  color: var(--muted);
}

.feature-list,
.education-list,
.experience-grid {
  display: grid;
  gap: 16px;
}

.feature-list article,
.education-list article,
.experience-grid article,
.timeline article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
}

.feature-list article,
.education-list article,
.experience-grid article {
  padding: 24px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.education-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.timeline article {
  padding: 26px;
  min-height: 210px;
  box-shadow: 0 1px 0 rgba(23, 33, 43, 0.04);
}

.timeline article:first-child {
  border-top: 4px solid var(--teal);
}

.timeline article:nth-child(2) {
  border-top: 4px solid var(--amber);
}

.timeline article:nth-child(3) {
  border-top: 4px solid var(--coral);
}

.tag {
  display: inline-block;
  margin-bottom: 18px;
  color: var(--teal);
}

.date {
  margin-bottom: 8px;
  color: var(--coral);
}

.experience-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.contact {
  width: min(1120px, calc(100% - 36px));
  margin: 0 auto clamp(46px, 8vw, 90px);
  padding: clamp(34px, 7vw, 64px);
  border-radius: 8px;
  color: #fff;
  background: var(--ink);
  box-shadow: var(--shadow);
}

.contact h2 {
  max-width: 760px;
  margin-bottom: 26px;
}

.contact-links {
  gap: 12px;
  flex-wrap: wrap;
}

.contact-links a {
  min-height: 42px;
  padding: 9px 14px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  color: rgba(255, 255, 255, 0.88);
  text-decoration: none;
}

.site-footer {
  justify-content: space-between;
  gap: 18px;
  padding: 26px clamp(18px, 4vw, 56px);
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 800px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero {
    min-height: 720px;
  }

  .hero-media {
    background:
      linear-gradient(180deg, rgba(12, 18, 24, 0.9) 0%, rgba(12, 18, 24, 0.6) 45%, rgba(12, 18, 24, 0.94) 100%),
      url("assets/research-hero.png") 64% center / cover;
  }

  .hero-inner {
    padding: 110px 0 72px;
  }

  .intro,
  .split,
  .timeline,
  .education-list,
  .experience-grid,
  .stats {
    grid-template-columns: 1fr;
  }

  .stats div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .stats div:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 520px) {
  .brand {
    font-size: 0.95rem;
  }

  .nav-links {
    gap: 14px;
    font-size: 0.88rem;
  }

  .hero-actions,
  .contact-links,
  .site-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .button,
  .contact-links a {
    width: 100%;
  }

  .timeline article,
  .feature-list article,
  .education-list article,
  .experience-grid article {
    padding: 20px;
  }

  .contact {
    padding: 28px 20px;
  }
}