:root {
  --bg: #f2f2f2;
  --surface: #f7f7f7;
  --text-main: #1f1f1f;
  --text-soft: #7d7d7d;
  --text-muted: #8b8b8b;
  --accent: #a55045;
  --rule: #d7d2cd;
  --strong-rule: #1d1d1d;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding-top: 8px;
  background: var(--bg);
  color: var(--text-main);
  font-family: 'Lato', sans-serif;
  line-height: 1.7;
}

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

.page-shell {
  min-height: 100vh;
  padding: 20px 14px 30px;
}

.site-container {
  max-width: 750px;
  margin: 0 auto;
}

.hero-grid {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 18px;
  align-items: start;
}

.profile-photo-wrap {
  width: 100%;
}

.profile-photo {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  background: #dddddd;
  border: 1px solid #dadada;
}

.top-header {
  padding-top: 0px;
}

.site-name {
  margin: 0 0 4px;
  padding-top: 4px;
  font-family: 'Cormorant Garamond', serif;
  font-size: clamp(1.8rem, 3.5vw, 2.3rem);
  font-weight: 500;
  line-height: 0.95;
  letter-spacing: 0.2px;
}

.site-role {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.85rem;
  font-weight: 300;
}

.contact-row {
  margin-top: 6px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  font-size: 0.8rem;
  color: var(--text-soft);
}

.contact-row a,
.contact-row span {
  color: var(--text-soft);
  text-decoration: none;
}

.contact-row a:first-child,
.contact-row a:nth-child(3) {
  color: var(--accent);
}

.contact-row a:hover {
  opacity: 0.8;
}

.copy-email-link {
  position: relative;
}

.copy-email-link::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: 125%;
  transform: translateX(-50%) translateY(4px);
  background: #1f1f1f;
  color: #f7f7f7;
  font-size: 0.68rem;
  line-height: 1;
  padding: 6px 8px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.copy-email-link.show-copy-tooltip::after {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.main-divider {
  height: 1px;
  background: var(--strong-rule);
  margin: 18px 0 28px;
}

.content-section {
  margin-bottom: 32px;
}

.section-title {
  margin: 0;
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.7px;
}

.section-rule {
  height: 1px;
  background: var(--rule);
  margin: 4px 0 12px;
}

.section-body {
  font-size: 0.85rem;
  color: #555;
}

.section-body p {
  margin: 0 0 8px;
}

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

.section-body a:hover {
  opacity: 0.8;
}

.timeline-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 1fr auto;
  
  align-items: start;
}

.research-item {
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "header date"
    "list list";
}

.research-header {
  grid-area: header;
}

.research-item .timeline-date {
  grid-area: date;
  margin-top: 2px;
}

.research-item .detail-list {
  grid-area: list;
  margin-top: 8px;
}

.timeline-main h3 {
  margin: 0 0 2px;
  font-size: 1rem;
  font-weight: 400;
  color: #111;
  opacity: 0.85;
  line-height: 1.25;
}

.inline-meta {
  font-size: 0.8rem;
  font-weight: 400;
  color: #666;
}

.institution {
  margin: 0 0 2px;
  color: #7a7a7a;
  font-size: 0.8rem;
}

.subtle {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.78rem;
}

.thesis-title {
  margin: 6px 0 10px;
  font-size: 0.92rem;
  font-weight: 600;
  opacity: 0.8;
  color: #2a2a2a;
  line-height: 1.5;
}

.timeline-date {
  color: #8a8a8a;
  font-size: 0.8rem;
  white-space: nowrap;
  padding-top: 2px;
}

.placeholder-text {
  color: #8a8a8a;
  font-style: italic;
}

.detail-list {
  margin: 8px 0 0 18px;
  padding: 0;
}

.detail-list li {
  margin-bottom: 8px;
  color: #555;
}

.skill-label {
  color: rgba(31, 31, 31, 0.72);
  font-weight: 600;
}

.reference-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

.reference-card h3 {
  margin: 0 0 4px;
  font-size: 1.05rem;
  font-weight: 500;
  opacity: 0.9;
  color: #111;
}

@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr 100px;
    gap: 14px;
  }

  .profile-photo-wrap {
    max-width: 100px;
    order: 2;
  }

  .hero-content {
    order: 1;
  }

  .profile-photo {
    aspect-ratio: 1;
    object-fit: contain;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .research-item {
    grid-template-columns: 1fr auto;
    gap: 12px;
  }

  .research-item .detail-list {
    margin-top: 2px;
  }

  .timeline-date {
    padding-top: 0;
  }

  .reference-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }
}

@media (max-width: 640px) {
  .page-shell {
    padding: 14px 10px 24px;
  }

  .timeline-item {
    gap: 6px;
  }

  #education .timeline-item {
    gap: 2px;
  }

  .thesis-title {
    margin: 4px 0 4px;
  }

  .detail-list {
    margin-top: 4px;
  }

  .site-name {
    font-size: 1.5rem;
  }

  .contact-row,
  .section-body,
  .institution,
  .subtle,
  .timeline-date,
  .thesis-title {
    font-size: 0.75rem;
  }

  .site-role {
    font-size: 0.75rem;
    padding-top: 2px;
  }

  .timeline-main h3,
  .reference-card h3 {
    font-size: 0.9rem;
  }

  .section-title {
    font-size: 1.05rem;
  }

  .inline-meta {
    font-size: 0.72rem;
  }

  .detail-list {
    margin-left: 16px;
  }
}