:root {
  --bg: #f6f8fc;
  --bg-alt: #eef3fb;
  --section-light: #f6f8fc;
  --section-tint: var(--accent-soft);
  --surface: #ffffff;
  --surface-strong: rgba(255, 255, 255, 0.92);
  --text: #15202b;
  --muted: #5b6675;
  --border: #dce4f1;
  --accent: #1f4fa3;
  --accent-soft: #dfe9fb;
  --accent-strong: #153a7c;
  --shadow: 0 22px 48px rgba(15, 28, 56, 0.08);
  --radius: 22px;
  --radius-small: 14px;
  --max-width: 1080px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

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

a:hover {
  text-decoration: underline;
}

.container {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  background: rgba(246, 248, 252, 0.9);
  border-bottom: 1px solid rgba(220, 228, 241, 0.95);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  color: var(--text);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand:hover {
  text-decoration: none;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  flex-wrap: wrap;
}

.main-nav a {
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 600;
  padding: 0.75rem 0.85rem;
  border-radius: 999px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.main-nav a:hover,
.main-nav a.active {
  background: var(--accent-soft);
  color: var(--accent);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  border: 0;
  background: transparent;
  padding: 0.25rem;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px 0;
  background: var(--text);
}

.section {
  scroll-margin-top: 90px;
  padding: 3.6rem 0;
}

main .section:nth-of-type(odd) {
  background: var(--section-tint);
}

main .section:nth-of-type(even) {
  background: var(--section-light);
}

.hero-section {
  padding-top: 2.25rem;
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  font-weight: 700;
}

h1,
h2,
h3,
h4 {
  margin-top: 0;
  letter-spacing: -0.03em;
}

h1 {
  margin-bottom: 0.25rem;
  font-size: clamp(2rem, 4.6vw, 3.35rem);
  line-height: 1.02;
}

h2 {
  margin-bottom: 0.95rem;
  font-size: clamp(1.55rem, 3vw, 2.2rem);
}

h3 {
  margin-bottom: 0.45rem;
  font-size: 1.1rem;
}

h4 {
  margin-bottom: 0.45rem;
  font-size: 1rem;
}

p,
li {
  color: var(--muted);
  line-height: 1.74;
}

.hero-layout,
.content-grid,
.project-grid,
.publication-list,
.info-stack,
.career-list {
  display: grid;
  gap: 1.25rem;
}

.about-card,
.info-card,
.publication-item,
.project-card,
.career-content,
.text-panel {
  background: var(--surface-strong);
  border: 1px solid rgba(220, 228, 241, 0.95);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
}

.hero-rotating-line {
  min-height: 1.5rem;
  margin: 0 0 1.1rem;
  color: var(--accent);
  font-weight: 700;
  font-size: clamp(1rem, 2.1vw, 1.2rem);
}

#rotating-text {
  display: inline-block;
}

.about-card {
  padding: 1.3rem;
  display: grid;
  grid-template-columns: minmax(170px, 230px) 1fr;
  gap: 1.5rem;
  align-items: start;
}

.about-card-media {
  display: grid;
  gap: 1rem;
  justify-items: center;
}

.about-card-image {
  width: min(100%, 220px);
}

.about-card-image img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: 50%;
  border: 1px solid rgba(220, 228, 241, 0.95);
}

.lead {
  color: var(--text);
}

.tag-row,
.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.tag-row {
  margin: 1rem 0 1.15rem;
}

.tag-row span {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.82rem;
  border-radius: 999px;
  background: var(--bg-alt);
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
}

.social-links a,
.link-row a,
.project-card a,
.muted-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.7rem 0.95rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-weight: 700;
}

.social-links a:hover,
.link-row a:hover,
.project-card a:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.social-links {
  justify-content: center;
  row-gap: 0.25rem;
}

.social-links a {
  width: 2.55rem;
  min-height: 2.55rem;
  height: 2.55rem;
  padding: 0;
  border-radius: 50%;
  color: var(--accent-strong);
  font-size: 0.82rem;
  line-height: 1;
}

.social-links a:hover {
  background: var(--accent-soft);
}

.social-links .social-icon {
  width: 1.15rem;
  height: 1.15rem;
  fill: currentColor;
  overflow: visible;
}

.social-row-break {
  flex-basis: 100%;
  height: 0;
}

.social-links .scholar-mark {
  width: 1.3rem;
  height: 1.3rem;
}

.social-links .researchgate-mark {
  width: 1.42rem;
  height: 1.42rem;
}

.researchgate-mark text {
  fill: currentColor;
  font-family: "Inter", system-ui, sans-serif;
  font-size: 16.8px;
  font-weight: 800;
  letter-spacing: -0.16em;
}

.scholar-mark circle:first-child {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
}

.scholar-mark path,
.scholar-mark circle:last-child {
  fill: currentColor;
}

.scholar-mark path:last-of-type {
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 1.6;
}

.social-links .linkedin-mark {
  width: 1.35rem;
  height: 1.28rem;
}

.social-links .github-mark {
  width: 1.25rem;
  height: 1.25rem;
}

.social-links .x-mark {
  width: 1rem;
  height: 1rem;
}

.social-links .instagram-link {
  color: var(--accent-strong);
}

.social-links .instagram-link:hover {
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.social-links .instagram-mark {
  width: 1.28rem;
  height: 1.28rem;
}

.muted-link {
  opacity: 0.65;
  cursor: default;
}

.section-heading {
  margin-bottom: 1.2rem;
}

.section-heading.with-link {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.section-heading.with-link h2 {
  margin-bottom: 0;
}

.section-heading.with-link .social-links {
  justify-content: flex-start;
  transform: translateY(0.08rem);
}

.section-subtext {
  margin: 0;
  color: var(--muted);
}

.two-columns {
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.85fr);
  align-items: start;
}

.text-panel,
.info-card,
.publication-item,
.project-card,
.career-content {
  padding: 1.25rem 1.35rem;
}

.info-stack {
  gap: 1rem;
}

.info-card ul,
.project-card ul {
  margin: 0.55rem 0 0;
  padding-left: 1.15rem;
}

.career-item {
  position: relative;
  display: grid;
  gap: 1.2rem;
  grid-template-columns: 120px 28px minmax(0, 1fr);
  align-items: center;
}

.career-item::before {
  content: "";
  position: absolute;
  top: -0.5rem;
  bottom: -0.5rem;
  left: calc(120px + 1.2rem + 14px);
  width: 2px;
  background: var(--border);
  transform: translateX(-50%);
}

.career-item:first-child::before {
  top: 50%;
}

.career-item:last-child::before {
  bottom: 50%;
}

.career-item::after {
  content: "";
  z-index: 1;
  grid-column: 2;
  grid-row: 1;
  justify-self: center;
  width: 0.72rem;
  height: 0.72rem;
  border: 0.42rem solid var(--surface);
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.career-date {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.95rem;
  text-align: right;
}

.career-content {
  grid-column: 3;
}

.career-list {
  gap: 1rem;
}

.publication-group + .publication-group {
  margin-top: 2rem;
}

.publication-group > h3 {
  margin-bottom: 0.95rem;
}

.publication-list {
  grid-template-columns: 1fr;
}

.project-grid {
  grid-template-columns: 1fr;
}

.publication-item {
  display: grid;
  grid-template-columns: minmax(260px, 360px) minmax(0, 1fr);
  gap: 1.1rem;
  align-items: center;
}

.publication-media {
  align-self: stretch;
  display: flex;
  align-items: center;
}

.publication-media img {
  width: 100%;
  max-height: 22rem;
  object-fit: contain;
  border-radius: var(--radius-small);
  background: var(--bg-alt);
}

.publication-content h4 {
  margin-bottom: 0.7rem;
}

.pub-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.75rem;
}

.pub-chips span {
  display: inline-flex;
  align-items: center;
  padding: 0.38rem 0.68rem;
  border-radius: 999px;
  background: var(--bg-alt);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 700;
}

.paper-actions {
  margin-top: 0.9rem;
  gap: 0.5rem;
}

.paper-actions a {
  min-height: 36px;
  padding: 0.55rem 0.8rem;
  font-size: 0.9rem;
}

.project-actions {
  margin-bottom: 0.8rem;
}

.site-footer {
  padding: 2rem 0 3rem;
  border-top: 1px solid rgba(220, 228, 241, 0.75);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.footer-inner p {
  margin: 0.35rem 0 0;
}

.footer-links a {
  font-size: 0.92rem;
}

.footer-links.social-links {
  flex-wrap: nowrap;
}

.footer-privacy-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
}

.footer-privacy-link:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.privacy-section {
  min-height: calc(100vh - 73px);
}

.privacy-panel {
  color: var(--text);
  max-width: 760px;
}

.privacy-panel h1 {
  margin-bottom: 1rem;
}

.privacy-panel p {
  color: inherit;
}

.privacy-back-link {
  margin-top: 1.5rem;
}

.privacy-back-link a {
  font-weight: 700;
}

@media (max-width: 920px) {
  .section {
    padding: 3rem 0;
  }

  .about-card,
  .two-columns,
  .publication-item,
  .project-grid {
    grid-template-columns: 1fr;
  }

  .publication-media {
    align-self: auto;
  }

  .publication-media img {
    max-height: 18rem;
  }

  .about-card-image {
    max-width: 250px;
  }

}

@media (max-width: 760px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 1rem;
    left: 1rem;
    display: none;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.97);
    border: 1px solid rgba(220, 228, 241, 0.95);
    box-shadow: var(--shadow);
    border-radius: 18px;
    flex-direction: column;
    align-items: stretch;
  }

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

  .main-nav a {
    padding: 0.8rem 0.9rem;
  }

  .hero-section {
    padding-top: 1.5rem;
  }

  .about-card {
    padding: 1rem;
    gap: 1rem;
  }

  .about-card-image {
    max-width: 200px;
  }

  .career-item {
    gap: 0.7rem 0.9rem;
    grid-template-columns: 28px minmax(0, 1fr);
  }

  .career-item::before {
    left: 14px;
  }

  .career-item::after {
    grid-column: 1;
    grid-row: 1 / span 2;
  }

  .career-date,
  .career-content {
    grid-column: 2;
  }

  .career-date {
    text-align: left;
  }

  .link-row a,
  .project-card a,
  .muted-link {
    width: 100%;
    justify-content: center;
  }

  .paper-actions a {
    width: auto;
  }

  .social-links a {
    width: 2.55rem;
  }

  .footer-inner {
    align-items: flex-start;
  }
}