/* ------------------------------
   Base
------------------------------ */

:root {
  --background: #ffffff;
  --surface: #f5f7fb;
  --text: #172033;
  --muted: #667085;
  --border: #dfe4ec;
  --accent: #315efb;
  --accent-dark: #2247c7;
  --max-width: 1080px;
  --radius: 18px;
  --shadow: 0 18px 50px rgba(31, 45, 78, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  line-height: 1.7;
}

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

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-dark);
}

.container {
  width: min(calc(100% - 40px), var(--max-width));
  margin: 0 auto;
}

.narrow {
  max-width: 760px;
}

/* ------------------------------
   Header
------------------------------ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(223, 228, 236, 0.85);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  color: var(--text);
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.site-nav {
  display: flex;
  gap: 26px;
}

.site-nav a {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.site-nav a:hover {
  color: var(--text);
}

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
}

.menu-button span {
  display: block;
  width: 19px;
  height: 2px;
  margin: 4px auto;
  background: var(--text);
}

/* ------------------------------
   Hero
------------------------------ */

.hero {
  padding: 90px 0 78px;
  background:
    radial-gradient(circle at 10% 10%, rgba(49, 94, 251, 0.10), transparent 28%),
    radial-gradient(circle at 92% 18%, rgba(49, 94, 251, 0.07), transparent 24%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 64px;
  align-items: center;
}

.profile-card {
  width: 240px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: white;
  box-shadow: var(--shadow);
}

.profile-photo {
  width: 100%;
  aspect-ratio: 35 / 49;
  object-fit: cover;
  object-position: center top;
  border-radius: 10px;
}

.profile-links {
  display: grid;
  gap: 8px;
  margin-top: 16px;
}

.profile-links a {
  display: block;
  padding: 9px 12px;
  border-radius: 10px;
  background: var(--surface);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 700;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(3rem, 8vw, 5.8rem);
  line-height: 0.98;
  letter-spacing: -0.065em;
}

.hero-subtitle {
  margin: 24px 0 0;
  color: #364152;
  font-size: 1.14rem;
  line-height: 1.65;
}

.hero-summary {
  max-width: 690px;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 1.04rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 12px;
  font-weight: 800;
}

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

.button.primary:hover {
  background: var(--accent-dark);
  color: #fff;
}

.button.secondary {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
}

.contact-line {
  margin-top: 26px;
  color: var(--muted);
}

.contact-line span {
  margin-right: 6px;
  font-weight: 700;
  color: var(--text);
}

/* ------------------------------
   Sections
------------------------------ */

.section {
  padding: 88px 0;
}

.section-alt {
  background: var(--surface);
}

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

.section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.15;
  letter-spacing: -0.045em;
}

.section-heading > p:last-child {
  max-width: 720px;
  margin: 14px 0 0;
  color: var(--muted);
}

.interest-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.interest-list span {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  font-size: 0.9rem;
  font-weight: 700;
}

/* ------------------------------
   Publications
------------------------------ */

.publication-list {
  display: grid;
  gap: 18px;
}

.publication-card {
  display: grid;
  grid-template-columns: 80px minmax(0, 1fr);
  gap: 24px;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
}

.publication-year {
  color: var(--accent);
  font-size: 1.1rem;
  font-weight: 900;
}

.publication-card h3 {
  margin: 0;
  font-size: 1.17rem;
  line-height: 1.45;
}

.authors,
.venue,
.publication-description {
  margin: 7px 0 0;
}

.authors {
  color: #364152;
}

.venue {
  color: var(--muted);
  font-style: italic;
}

.publication-description {
  color: var(--muted);
}

.publication-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 14px;
}

.publication-links a {
  padding: 5px 9px;
  border-radius: 8px;
  background: var(--surface);
  font-size: 0.86rem;
  font-weight: 800;
}

/* ------------------------------
   Awards timeline
------------------------------ */

.timeline {
  position: relative;
  display: grid;
  gap: 22px;
}

.timeline::before {
  position: absolute;
  top: 7px;
  bottom: 7px;
  left: 66px;
  width: 1px;
  background: var(--border);
  content: "";
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 28px;
}

.timeline-date {
  position: relative;
  color: var(--accent);
  font-weight: 900;
}

.timeline-date::after {
  position: absolute;
  top: 8px;
  right: -6px;
  width: 11px;
  height: 11px;
  border: 3px solid #fff;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 1px var(--border);
  content: "";
}

.timeline-content {
  padding: 0 0 18px;
}

.timeline-content h3 {
  margin: 0;
  font-size: 1.08rem;
}

.timeline-content p {
  margin: 6px 0 0;
}

/* ------------------------------
   Education and contact
------------------------------ */

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.info-card,
.contact-box {
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
}

.info-card h3 {
  margin-top: 0;
  font-size: 1.18rem;
}

.info-entry h4 {
  margin: 6px 0;
  font-size: 1.02rem;
}

.info-entry p {
  margin: 5px 0;
}

.info-date {
  color: var(--accent);
  font-weight: 800;
}

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

.contact-section {
  text-align: center;
}

.contact-box {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 28px;
  text-align: left;
}

/* ------------------------------
   Footer
------------------------------ */

.site-footer {
  padding: 26px 0;
  border-top: 1px solid var(--border);
}

.footer-wrap {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-wrap p {
  margin: 0;
}

/* ------------------------------
   Responsive
------------------------------ */

@media (max-width: 800px) {
  .hero {
    padding-top: 58px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .profile-card {
    max-width: 340px;
  }

  .two-column,
  .contact-box {
    grid-template-columns: 1fr;
  }

  .menu-button {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 68px;
    right: 20px;
    left: 20px;
    display: none;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: #fff;
    box-shadow: var(--shadow);
  }

  .site-nav.open {
    display: grid;
    gap: 12px;
  }
}

@media (max-width: 560px) {
  .container {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .section {
    padding: 68px 0;
  }

  .hero h1 {
    font-size: 3.25rem;
  }

  .publication-card {
    grid-template-columns: 1fr;
    gap: 8px;
    padding: 20px;
  }

  .timeline::before {
    left: 0;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 4px;
    padding-left: 22px;
  }

  .timeline-date::after {
    top: 8px;
    right: auto;
    left: -27px;
  }

  .footer-wrap {
    flex-direction: column;
  }
}

.publication-group {
  display: grid;
  gap: 24px;
}

.paper-item {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.paper-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.paper-item h3 {
  margin: 0;
  font-size: 1.17rem;
  line-height: 1.45;
}