:root {
  --ink: #303438;
  --muted: #666d73;
  --line: #e6e8ea;
  --link: #296a9c;
  --link-hover: #174d75;
  --paper: #ffffff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: none; }
a:hover, a:focus-visible { color: var(--link-hover); text-decoration: underline; text-underline-offset: 3px; }
.site-shell { min-height: 100vh; display: flex; flex-direction: column; }
.topbar { border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, 0.97); }
.nav {
  width: min(1120px, calc(100% - 48px));
  min-height: 66px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { color: var(--ink); font-size: 19px; font-weight: 600; letter-spacing: -0.01em; }
.brand:hover, .brand:focus-visible { color: var(--ink); text-decoration: none; }
.nav-links { display: flex; gap: 32px; }
.nav-links a { color: #555c62; font-size: 15px; }
.page-grid {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  padding: 70px 0 96px;
  display: grid;
  grid-template-columns: 260px minmax(0, 690px);
  gap: 76px;
  align-items: start;
}
.profile-card { text-align: center; }
.photo-placeholder {
  width: 190px;
  aspect-ratio: 1;
  margin: 0 auto 23px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #edf1f4;
  color: #687580;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 42px;
  letter-spacing: 0.04em;
  user-select: none;
}
.profile-card h2 {
  margin: 0;
  color: #2f3438;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 23px;
  font-weight: 700;
  line-height: 1.25;
}
.role { margin: 10px 0 0; color: #444b50; line-height: 1.5; }
.affiliation { margin: 5px 0 0; color: var(--muted); font-size: 14px; line-height: 1.55; }
.contact-list { width: max-content; margin: 22px auto 0; display: grid; gap: 8px; text-align: left; }
.contact-list a { display: flex; align-items: center; gap: 9px; color: #51585e; font-size: 14px; }
.contact-icon {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.65;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.github-icon { fill: currentColor; stroke: none; }
.content { padding-top: 2px; }
.content h1 {
  margin: 0 0 27px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  color: #252a2e;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(34px, 4vw, 43px);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.2;
}
.content h1 span {
  margin-left: 5px;
  font-family: "Songti SC", "Noto Serif CJK SC", serif;
  font-size: 0.67em;
  letter-spacing: 0;
}
.content p { margin: 0 0 19px; max-width: 68ch; }
.quick-links { margin: 32px 0 0; padding-top: 25px; border-top: 1px solid var(--line); }
.quick-links > div { display: flex; flex-wrap: wrap; gap: 0 7px; margin: 7px 0; }
.quick-links dt { font-weight: 700; }
.quick-links dd { margin: 0; }
footer {
  width: min(1120px, calc(100% - 48px));
  margin: auto auto 0;
  padding: 22px 0 28px;
  border-top: 1px solid var(--line);
  color: #858b90;
  font-size: 13px;
}
footer p { margin: 0; }

@media (max-width: 760px) {
  .nav { width: min(100% - 32px, 1120px); }
  .nav-links { gap: 22px; }
  .page-grid { width: min(100% - 36px, 640px); padding: 44px 0 72px; grid-template-columns: 1fr; gap: 50px; }
  .photo-placeholder { width: 155px; }
  .content h1 { font-size: 34px; }
  footer { width: min(100% - 36px, 640px); }
}

@media (max-width: 420px) {
  .brand { font-size: 17px; }
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 14px; }
  .content h1 span { display: block; margin: 6px 0 0; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }