:root {
  --bg: #f7f8fb;
  --card: #ffffff;
  --text: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --primary: #111827;
  --soft: #eef2ff;
  --radius: 22px;
  --shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, #e0f2fe 0, transparent 32%),
    radial-gradient(circle at top right, #fef3c7 0, transparent 28%),
    var(--bg);
  line-height: 1.65;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(247, 248, 251, 0.8);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(229, 231, 235, 0.7);
}

.nav {
  max-width: 1120px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-weight: 800;
  font-size: 18px;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 22px;
  font-size: 14px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 56px 24px;
}

.hero {
  min-height: 560px;
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  align-items: center;
  gap: 48px;
}

.eyebrow {
  display: inline-flex;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--soft);
  color: #3730a3;
  font-weight: 700;
  font-size: 14px;
  margin-bottom: 20px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(48px, 8vw, 88px);
  line-height: 0.95;
  letter-spacing: -0.07em;
}

.intro {
  max-width: 720px;
  margin: 28px 0 0;
  color: #374151;
  font-size: 20px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.1);
}

.button.primary {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.hero-card {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(229, 231, 235, 0.9);
  border-radius: 32px;
  padding: 26px;
  box-shadow: var(--shadow);
}

.profile-img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 24px;
  background: #eef2f7;
}

.profile-info {
  padding: 20px 4px 4px;
}

.profile-info h2 {
  margin: 0 0 6px;
  font-size: 26px;
  letter-spacing: -0.04em;
}

.profile-info p {
  margin: 4px 0;
  color: var(--muted);
}

.section {
  padding: 72px 0;
  border-top: 1px solid rgba(229, 231, 235, 0.85);
}

.section-title {
  margin-bottom: 28px;
}

.section-title span {
  display: block;
  color: #6366f1;
  font-weight: 800;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 8px;
}

.section-title h2 {
  margin: 0;
  font-size: clamp(32px, 4vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.05em;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag-list span {
  padding: 13px 18px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--line);
  color: #374151;
  font-weight: 700;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.04);
}

.link-grid,
.area-grid,
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.link-card,
.area-card,
.contact-card,
.project-card {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(229, 231, 235, 0.95);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 14px 40px rgba(15, 23, 42, 0.05);
}

.link-card {
  min-height: 170px;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.link-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.link-card h3,
.area-card h3,
.contact-card h3,
.project-card h3 {
  margin: 0 0 10px;
  font-size: 21px;
  letter-spacing: -0.03em;
}

.link-card p,
.area-card p,
.contact-card p,
.project-card p {
  margin: 0;
  color: var(--muted);
}

.timeline {
  display: grid;
  gap: 18px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 26px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(229, 231, 235, 0.95);
  border-radius: var(--radius);
  box-shadow: 0 14px 40px rgba(15, 23, 42, 0.04);
}

.timeline-date {
  color: #6366f1;
  font-weight: 800;
}

.timeline-content h3 {
  margin: 0 0 6px;
  font-size: 24px;
  letter-spacing: -0.03em;
}

.timeline-content p {
  margin: 5px 0;
  color: var(--muted);
}

.timeline-content .degree {
  color: var(--text);
  font-weight: 800;
}

.area-grid {
  grid-template-columns: repeat(3, 1fr);
}

.area-card ul {
  margin: 12px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.area-card li {
  margin: 8px 0;
}

.project-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.project-card p {
  max-width: 720px;
}

.contact-grid {
  grid-template-columns: repeat(3, 1fr);
}

.contact-card a {
  color: #2563eb;
  word-break: break-word;
  text-decoration: none;
  font-weight: 700;
}

.qr-grid {
  display: flex;
  gap: 18px;
  margin-top: 22px;
  flex-wrap: wrap;
}

.qr-card {
  width: 160px;
  padding: 16px;
  border-radius: 20px;
  background: white;
  border: 1px solid var(--line);
  text-align: center;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.05);
}

.qr-card img {
  width: 100%;
  border-radius: 14px;
}

.qr-card p {
  margin: 10px 0 0;
  font-weight: 800;
}

footer {
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 24px 56px;
  color: var(--muted);
  border-top: 1px solid rgba(229, 231, 235, 0.85);
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

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

  .area-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }

  .project-card {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

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

  main {
    padding: 36px 18px;
  }

  .hero h1 {
    font-size: 54px;
  }

  .intro {
    font-size: 17px;
  }

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

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

.education-item {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(229, 231, 235, 0.95);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 14px 40px rgba(15, 23, 42, 0.05);
}

.education-main {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: start;
}

.education-main h3 {
  margin: 0 0 6px;
  font-size: 24px;
  letter-spacing: -0.03em;
}

.education-school {
  margin: 0 0 10px;
  color: var(--text);
  font-weight: 800;
  font-size: 17px;
}

.education-detail {
  margin: 5px 0;
  color: var(--muted);
}

.education-meta {
  min-width: 190px;
  text-align: right;
  color: var(--muted);
  font-weight: 700;
}

.education-meta p {
  margin: 0 0 6px;
}

@media (max-width: 900px) {
  .education-main {
    grid-template-columns: 1fr;
  }

  .education-meta {
    text-align: left;
    min-width: auto;
  }
}

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

.project-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: start;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(229, 231, 235, 0.95);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 14px 40px rgba(15, 23, 42, 0.05);
}

.project-content h3 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.35;
  letter-spacing: -0.03em;
}

.project-content p {
  margin: 0 0 10px;
  color: var(--muted);
}

.project-meta {
  color: #6366f1 !important;
  font-weight: 800;
  font-size: 14px;
}

.project-date {
  min-width: 170px;
  text-align: right;
  color: var(--muted);
  font-weight: 800;
  font-size: 14px;
}

@media (max-width: 900px) {
  .project-item {
    grid-template-columns: 1fr;
  }

  .project-date {
    min-width: auto;
    text-align: left;
  }
}

.page-section {
  min-height: 70vh;
  padding-top: 96px;
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.overview-card {
  display: block;
  min-height: 190px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(229, 231, 235, 0.95);
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: 0 14px 40px rgba(15, 23, 42, 0.05);
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.overview-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.overview-card h3 {
  margin: 0 0 10px;
  font-size: 23px;
  letter-spacing: -0.03em;
}

.overview-card p {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 900px) {
  .overview-grid {
    grid-template-columns: 1fr;
  }
}

/* Publications */

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

.publication-item {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(229, 231, 235, 0.95);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: 0 14px 40px rgba(15, 23, 42, 0.05);
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 28px;
  align-items: center;
}

.pub-title {
  color: var(--text);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.45;
  letter-spacing: -0.03em;
  margin: 0 0 10px;
}

.pub-authors {
  font-size: 15px;
  color: var(--muted);
  margin: 0 0 6px;
}

.pub-venue {
  font-size: 15px;
  color: #6366f1;
  font-weight: 800;
  margin: 0 0 10px;
}

.pub-tags {
  display: inline-block;
  padding: 7px 12px;
  border-radius: 999px;
  background: #eef2ff;
  color: #4338ca;
  font-size: 13px;
  font-weight: 700;
}

.pub-figure img {
  width: 100%;
  border-radius: 14px;
  border: 1px solid rgba(229, 231, 235, 0.95);
  display: block;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

@media (max-width: 900px) {
  .publication-item {
    grid-template-columns: 1fr;
  }
}

.pub-tags.submitted {
  background: #fef3c7;
  color: #92400e;
}

.pub-tags.inprep {
  background: #f0fdf4;
  color: #166534;
}

.edu-logo {
  width: 100%;
  max-width: 160px;
  height: auto;
  object-fit: contain;
  margin-top: 14px;
  border-radius: 10px;
}