/* ============================================================
   Xiangmin Yi — Academic Homepage
   中英双版共享样式（布局参照 huiningyuan.github.io 源码：
   左侧人物侧栏 + 右侧正文两栏结构）
   ============================================================ */

:root {
  color-scheme: light;
  --paper: #ffffff;
  --ink: #263440;
  --muted: #64717e;
  --link: #225f9e;
  --line: #e2e9ee;
  --wash: #f4f8fb;
  --page-width: 1130px;
  --header-height: 64px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 88px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue",
    Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--link); text-decoration: none; text-underline-offset: 3px; }
a:hover { text-decoration: underline; }
strong { font-weight: 600; }
p { margin: 0 0 14px; }
h1, h2, h3 { margin: 0; color: var(--ink); }
h2 { font-size: 26px; font-weight: 600; line-height: 1.25; letter-spacing: -0.3px; margin-bottom: 20px; }
h3 { font-size: 17.5px; font-weight: 600; line-height: 1.4; }

.icon { width: 18px; height: 18px; flex: 0 0 18px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

/* ---------- Header ---------- */
.site-header { position: sticky; top: 0; z-index: 5; border-bottom: 1px solid var(--line); background: rgba(255, 255, 255, 0.97); }
.header-inner { max-width: var(--page-width); min-height: var(--header-height); margin: 0 auto; padding: 0 26px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.home-link { font-weight: 600; font-size: 19px; color: var(--ink); white-space: nowrap; }
.home-link:hover { color: var(--link); text-decoration: none; }
.header-inner nav { display: flex; align-items: center; gap: 26px; }
.header-inner nav a { font-size: 15.5px; color: var(--muted); white-space: nowrap; }
.header-inner nav a:hover { color: var(--link); text-decoration: none; }
.header-inner nav .lang { color: var(--link); font-weight: 600; }

/* ---------- Two-column layout ---------- */
.page-layout {
  max-width: var(--page-width);
  margin: 44px auto 0;
  padding: 0 26px;
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  gap: 64px;
  align-items: start;
}

/* ---------- Left profile sidebar ---------- */
.profile { position: sticky; top: 88px; }
.portrait { display: block; width: 210px; max-width: 100%; height: 252px; object-fit: cover; border-radius: 5px; }
.profile h1 {
  margin: 20px 0 8px;
  font-family: Georgia, "Times New Roman", "Songti SC", "SimSun", serif;
  font-size: 30px;
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.5px;
}
.profile-role { line-height: 1.5; margin-bottom: 16px; font-size: 16px; }
.profile-affiliation { display: inline-flex; align-items: center; gap: 7px; }
.profile-interests { font-size: 15.5px; color: var(--muted); line-height: 1.5; margin-bottom: 20px; }
.profile-links { list-style: none; margin: 0; padding: 0; }
.profile-links li + li { margin-top: 8px; }
.profile-links a { display: inline-flex; align-items: center; gap: 10px; font-size: 15.5px; }
.email-address { display: inline-block; font-size: 14px; margin-top: 18px; color: var(--muted); overflow-wrap: anywhere; }

/* ---------- Main content ---------- */
main { min-width: 0; }
main > section { margin-bottom: 46px; scroll-margin-top: 20px; }
.about-section p { max-width: 76ch; }

.section-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; }
.section-heading h2 { margin-bottom: 7px; }
.section-link { font-size: 14px; white-space: nowrap; }
.section-note { font-size: 14px; color: var(--muted); margin-bottom: 18px; }

/* ---------- Publications ---------- */
.pub { padding: 22px 0 24px; border-bottom: 1px solid var(--line); }
.pub:first-of-type { padding-top: 0; }
.pub:last-child { border-bottom: 0; padding-bottom: 0; }

.pub-title { margin-bottom: 7px; font-size: 17.5px; line-height: 1.4; }
.pub-title a { color: var(--ink); }
.pub-title a:hover { color: var(--link); text-decoration: none; }

.pub-authors { font-size: 14.5px; color: var(--muted); line-height: 1.5; margin-bottom: 7px; }
.pub-authors .me { color: var(--link); font-weight: 700; }

.pub-desc { font-size: 15.5px; line-height: 1.5; margin-bottom: 9px; }

.pub-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; }

.venue {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  padding: 2px 11px;
  border-radius: 999px;
  white-space: nowrap;
}
.venue.iclr    { background: #e4f2ee; color: #3d7a6e; }
.venue.cvpr    { background: #f7e9e9; color: #a05252; }
.venue.neurips { background: #efeaf6; color: #6b5f96; }
.venue.journal { background: #e8f0f9; color: #3d6a99; }
.venue.preprint{ background: #f1f4f7; color: #64717e; }

.pub-links { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 17px; font-size: 14px; font-weight: 600; }

/* ---------- Experience / Education ---------- */
.entry { display: grid; grid-template-columns: 48px minmax(0, 1fr); column-gap: 17px; }
.entry-logo { grid-column: 1; grid-row: 1 / span 3; width: 48px; height: 48px; object-fit: contain; align-self: start; margin-top: 2px; }
.entry-heading, .entry > p { grid-column: 2; }
.entry-no-logo .entry-heading, .entry-no-logo > p { grid-column: 1 / -1; }
.entry + .entry { margin-top: 24px; }
.entry-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; }
.entry-heading h3 { font-size: 17.5px; }
.entry-date { flex-shrink: 0; font-size: 14px; color: var(--muted); margin-bottom: 3px; }
.entry-role { font-size: 16px; margin: 2px 0 4px; }
.entry > p:last-child { font-size: 15.5px; color: var(--muted); line-height: 1.55; margin-bottom: 0; }
.hint { font-size: 13px; color: #b08a3e; font-weight: 400; }

/* ---------- Honors ---------- */
.honors-list { list-style: none; padding: 0; margin: 0; }
.honors-list li { display: grid; grid-template-columns: 46px minmax(0, 1fr); gap: 13px; font-size: 15.5px; line-height: 1.55; }
.honors-list li + li { margin-top: 12px; }
.honor-year { color: var(--muted); }

/* ---------- Footer ---------- */
.site-footer { margin: 52px 0 30px; padding-top: 18px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 15px; color: var(--muted); font-size: 13px; }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .page-layout { grid-template-columns: 210px minmax(0, 1fr); gap: 38px; }
  .header-inner nav { gap: 20px; }
}

@media (max-width: 760px) {
  :root { --header-height: 56px; }
  html { scroll-padding-top: 76px; }
  .profile { top: 72px; }
  .header-inner { padding: 0 20px; justify-content: center; }
  .home-link { display: none; }
  .header-inner nav { width: 100%; justify-content: space-between; gap: 10px; }
  .header-inner nav a { font-size: 14.5px; }
  .page-layout { display: block; margin-top: 28px; padding: 0 22px; }
  .profile { position: static; display: grid; grid-template-columns: 130px minmax(0, 1fr); gap: 22px; margin-bottom: 36px; }
  .portrait { width: 130px; height: 165px; }
  .profile h1 { margin-top: 0; font-size: 27px; margin-bottom: 6px; }
  .profile-role { font-size: 15px; margin-bottom: 10px; }
  .profile-interests { display: none; }
  .profile-links { display: flex; flex-wrap: wrap; gap: 8px 16px; }
  .profile-links li + li { margin-top: 0; }
  .profile-links a { font-size: 14px; gap: 6px; }
  .email-address { margin-top: 10px; font-size: 12.5px; }
  h2 { font-size: 24px; margin-bottom: 16px; }
  main > section { margin-bottom: 38px; }
}

@media (max-width: 520px) {
  body { font-size: 16px; line-height: 1.6; }
  .page-layout { padding: 0 18px; }
  .profile { grid-template-columns: 105px minmax(0, 1fr); gap: 18px; margin-bottom: 30px; }
  .portrait { width: 105px; height: 142px; }
  .profile h1 { font-size: 24px; }
  .profile-role { font-size: 14px; }
  .profile-links a { font-size: 13px; }
  .profile-links .icon { display: none; }
  .email-address { font-size: 12px; margin-top: 8px; }
  .entry-heading { display: block; }
  .entry-date { margin-top: 2px; }
  .entry { grid-template-columns: 40px minmax(0, 1fr); column-gap: 13px; }
  .entry-logo { width: 40px; height: 40px; }
  .site-footer { flex-direction: column; gap: 3px; }
}

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