:root {
  --bg: #ffffff;
  --text: #1f2933;
  --muted: #687385;
  --line: #e6e8eb;
  --link: #235a97;
  --link-hover: #123c69;
  --soft: #f7f8fa;
  --soft-line: #dfe3e8;
  --tag-talk-bg: #fff3c4;
  --tag-talk-text: #6b4e00;
  --tag-poster-bg: #dcecff;
  --tag-poster-text: #184e7a;
  --tag-seminar-bg: #e3f4e8;
  --tag-seminar-text: #2f6f45;
  --tag-submitted-bg: #eee7ff;
  --tag-submitted-text: #563d7c;
  --tag-upcoming-bg: #ffe5e5;
  --tag-upcoming-text: #8a2f2f;
  --tag-paper-bg: #eef2f7;
  --tag-paper-text: #3f5873;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  font-size: 16.5px;
  line-height: 1.66;
  margin: 0;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 840px;
  margin: 42px auto 72px;
  padding: 0 24px;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
  margin-bottom: 36px;
}

.site-title {
  color: var(--text);
  font-size: 1.05rem;
  font-weight: 650;
  letter-spacing: 0.01em;
  text-decoration: none;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.95rem;
  font-size: 0.95rem;
}

.topnav a {
  color: var(--muted);
  text-decoration: none;
}

.topnav a:hover {
  color: var(--link-hover);
  text-decoration: none;
}

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

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
  text-underline-offset: 3px;
}

h1, h2, h3 {
  line-height: 1.25;
  font-weight: 650;
  letter-spacing: -0.015em;
}

h1 {
  font-size: 2rem;
  margin: 0 0 0.95rem;
}

h2 {
  font-size: 1.22rem;
  margin: 2.2rem 0 0.75rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px solid var(--line);
}

h3 {
  font-size: 1.04rem;
  margin: 1.5rem 0 0.5rem;
}

p {
  margin: 0 0 1rem;
}

em {
  font-style: italic;
}

.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 190px;
  gap: 46px;
  align-items: start;
}

.home-main {
  min-width: 0;
}

.lead {
  font-size: 1.08rem;
  line-height: 1.58;
}

.contact-line {
  color: var(--muted);
  margin-top: 1.15rem;
}

.links-line {
  font-size: 0.98rem;
  margin-top: 1.1rem;
}

.dot {
  color: #b0b8c2;
  margin: 0 0.38rem;
}

.portrait-frame {
  width: 190px;
  height: 235px;
  border: 1px solid var(--soft-line);
  background: linear-gradient(180deg, #fafafa 0%, #f3f5f7 100%);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 8px 28px rgba(15, 23, 42, 0.06);
}

.portrait-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.portrait-placeholder {
  display: none;
  width: 100%;
  height: 100%;
  align-items: center;
  justify-content: center;
  color: #9aa3ad;
  font-size: 2.4rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.news-section {
  margin-top: 2.3rem;
}

.news-list, .item-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.news-list li {
  padding: 0.52rem 0;
  border-bottom: 1px solid var(--line);
}

.news-date {
  font-weight: 650;
}

.news-highlight {
font-weight: 400;
}

.news-highlight strong {
font-weight: 600;
}

.item-list li {
  padding: 0.82rem 0;
  border-bottom: 1px solid var(--line);
}

.paper-title, .talk-title, .course-title {
  font-weight: 650;
}

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

.tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.015em;
  border-radius: 999px;
  padding: 0.28rem 0.52rem;
  margin-right: 0.35rem;
  vertical-align: 0.08rem;
  white-space: nowrap;
}

.tag-talk {
  background: var(--tag-talk-bg);
  color: var(--tag-talk-text);
}

.tag-poster {
  background: var(--tag-poster-bg);
  color: var(--tag-poster-text);
}

.tag-seminar {
  background: var(--tag-seminar-bg);
  color: var(--tag-seminar-text);
}

.tag-submitted {
  background: var(--tag-submitted-bg);
  color: var(--tag-submitted-text);
}

.tag-upcoming {
  background: var(--tag-upcoming-bg);
  color: var(--tag-upcoming-text);
}

.tag-fellowship {
background: #f8e9eb;
color: #6f1d2a;
border: 1px solid #ddb5bb;
}

.tag-paper {
background: var(--tag-paper-bg);
color: var(--tag-paper-text);
border: 1px solid #d5dde8;
}

.teaching-list .tag {
  background: #fce7ef;
  color: #8b3e5d;
  border-color: #f4c5d7;
}

.content-page {
  max-width: 780px;
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

  .page {
    margin-top: 28px;
    padding: 0 20px;
  }

  .site-header {
    display: block;
    margin-bottom: 30px;
  }

  .topnav {
    justify-content: flex-start;
    margin-top: 0.55rem;
    gap: 0.75rem;
  }

  .home-hero {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .portrait-frame {
    width: 165px;
    height: 205px;
    order: -1;
  }
}