:root {
  --text: #222;
  --sub: #666;
  --line: #e5e5e5;
  --link: #1a5fb4;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: #fff;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Noto Sans JP", "Hiragino Sans", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  font-size: 15px;
  line-height: 1.8;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 800px; margin: 0 auto; padding: 0 20px; }

/* header */
.header {
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 4px 24px;
  padding: 20px 0 12px; border-bottom: 1px solid var(--line);
}
.site-name { color: var(--text); font-weight: 700; font-size: 16px; }
.site-name:hover { text-decoration: none; }
.nav { display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 14px; }
.nav a { color: var(--sub); }
.nav a:hover, .nav a.active { color: var(--text); }
.nav a.active { font-weight: 700; }

/* intro */
.intro { display: flex; gap: 28px; align-items: flex-start; padding: 36px 0 8px; }
.photo { width: 160px; height: 160px; object-fit: cover; border-radius: 4px; flex-shrink: 0; }
h1 { font-size: 24px; font-weight: 700; margin: 0; line-height: 1.4; }
h1 span { font-size: 16px; font-weight: 400; color: var(--sub); margin-left: 8px; }
.affil { margin: 2px 0 12px; color: var(--sub); }
.intro p { margin: 0 0 10px; }
.profile-links { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-top: 14px; }
.profile-links a { display: inline-flex; align-items: center; gap: 6px; color: var(--text); white-space: nowrap; }
.profile-links a:hover { color: var(--link); text-decoration: none; }
.profile-links svg { flex-shrink: 0; }

.page-title { font-size: 24px; margin: 36px 0 4px; }

/* sections */
section { padding-top: 12px; }
h2 {
  font-size: 18px; font-weight: 700; margin: 36px 0 12px; padding-bottom: 4px;
  border-bottom: 1px solid var(--line);
}
h3 { font-size: 15px; font-weight: 700; margin: 24px 0 8px; }
.h-note { font-weight: 400; color: var(--sub); font-size: 13px; margin-left: 8px; }
.note { color: var(--sub); margin: 0 0 8px; }

/* lists: date | content */
.list { list-style: none; margin: 0; padding: 0; }
.list li { display: grid; grid-template-columns: 124px 1fr; gap: 16px; padding: 3px 0; }
.list .date { color: var(--sub); font-variant-numeric: tabular-nums; white-space: nowrap; }
.list .sub { color: var(--sub); }
.list .tag { color: var(--sub); font-size: 13px; }
.list--plain li { display: block; padding: 6px 0; }
.list--plain .desc { color: var(--sub); }
.list--research li { padding: 8px 0; }
.list--repos li { display: block; padding: 6px 0; }
.repo-name { display: inline-flex; align-items: center; gap: 6px; font-weight: 600; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 14px; }
.r-title { font-weight: 500; }
.r-desc { font-size: 14px; margin-top: 2px; }
.lead { margin: 0 0 8px; font-size: 16px; }
.bullets { margin: 0; padding-left: 1.3em; }
.bullets li { padding: 3px 0; }
.small { font-size: 13px; }
.topic + .topic { margin-top: 16px; }
.topic h3 { margin: 20px 0 4px; }
.topic p { margin: 0 0 8px; }
.topic b { font-weight: 700; }
.list--pubs li { display: block; padding: 6px 0; }
.list--pubs .title { font-weight: 500; }
.list--pubs .authors { color: var(--sub); font-size: 14px; }
.list--pubs .venue { font-style: italic; }

.footer { margin: 48px 0 0; padding: 16px 0 32px; border-top: 1px solid var(--line); color: var(--sub); font-size: 13px; }

@media (max-width: 600px) {
  body { font-size: 14px; }
  .intro { flex-direction: column; gap: 16px; padding-top: 24px; }
  .photo { width: 120px; height: 120px; }
  .list li { grid-template-columns: 1fr; gap: 0; padding: 6px 0; }
}

.page-photo { margin: 12px 0 8px; }
.page-photo img { display: block; width: 100%; height: 240px; object-fit: cover; border-radius: 4px; }
@media (max-width: 600px) { .page-photo img { height: 170px; } }
.page-photo figcaption { margin-top: 4px; font-size: 12px; color: var(--sub); }
.page-photo--figure img { height: auto; object-fit: contain; border: 1px solid var(--line); background: #fff; }
.page-photo--natural img { width: auto; max-width: 100%; height: 300px; }
.page-photo .credit { margin-top: 2px; font-size: 10px; color: #b0b0b0; text-align: right; }
.page-photo .credit a { color: inherit; }

/* header: 1行目に名前と言語切り替え、2行目にタブ */
.header { display: block; }
.header-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 8px; }
.lang-switch { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; font-size: 12px; line-height: 1; }
.lang-btn { padding: 6px 12px; color: var(--sub); }
.lang-btn:hover { color: var(--text); background: #f5f5f5; text-decoration: none; }
.lang-btn.is-active { background: var(--text); color: #fff; font-weight: 600; }