/* =========================================================
   张爱竹 学术主页 — Quiet Scholarly Editorial
   极简首页 + 论文按年份下钻
   ========================================================= */

@font-face { font-family: "Fraunces"; src: url("../fonts/fraunces-latin-var.woff2") format("woff2"); font-weight: 100 900; font-style: normal; font-display: swap; }
@font-face { font-family: "Source Sans 3"; src: url("../fonts/source-sans-3-latin-var.woff2") format("woff2"); font-weight: 200 900; font-style: normal; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("../fonts/ibm-plex-mono-latin-400.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "IBM Plex Mono"; src: url("../fonts/ibm-plex-mono-latin-500.woff2") format("woff2"); font-weight: 500; font-style: normal; font-display: swap; }

:root {
  --paper:       #FAF8F3;
  --surface:     #FFFFFF;
  --ink:         #1A1714;
  --ink-soft:    #6B655C;
  --hairline:    rgba(26,23,20,0.12);
  --accent:      #143B53;
  --accent-soft: #E7EEF2;
  --rule:        rgba(26,23,20,0.10);

  --serif: "Fraunces", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --sans:  "Source Sans 3", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", system-ui, sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --maxw: 1080px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --space: clamp(3.5rem, 7vw, 6rem);

  /* ---- 设计系统别名（统一调用） ---- */
  --bg: var(--paper);
  --text: var(--ink);
  --muted: var(--ink-soft);
  --line: var(--hairline);
  --max-width: var(--maxw);
  --section-space: var(--space);
  --radius: 6px;
}

[data-theme="dark"] {
  --paper:       #13110E;
  --surface:     #1C1916;
  --ink:         #F2EEE6;
  --ink-soft:    #A8A195;
  --hairline:    rgba(242,238,230,0.14);
  --accent:      #6FA8C7;
  --accent-soft: #1E2E38;
  --rule:        rgba(242,238,230,0.10);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 76px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .4s var(--ease), color .4s var(--ease);
}
body.no-scroll { overflow: hidden; }

a { color: inherit; }
a:focus-visible, button:focus-visible, [role="button"]:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

::selection { background: var(--accent-soft); color: var(--accent); }

/* ===== Navigation ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.1) blur(8px);
  border-bottom: 1px solid var(--hairline);
}
.nav__inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 1.5rem; height: 60px;
}
.nav__brand { display: flex; align-items: center; gap: .6rem; text-decoration: none; }
.nav__seal {
  display: grid; place-items: center;
  width: 30px; height: 30px;
  border: 1px solid var(--accent); color: var(--accent);
  font-family: var(--serif); font-size: 1.05rem;
  border-radius: 3px;
}
.nav__brandname { font-family: var(--mono); font-size: .82rem; letter-spacing: .04em; color: var(--ink-soft); }
.nav__en { font-family: var(--mono); font-size: .6rem; color: var(--muted); margin-left: .3rem; letter-spacing: .03em; text-transform: uppercase; }
.nav__links { display: flex; gap: 1.15rem; }
.nav__links a {
  text-decoration: none; font-size: .92rem; color: var(--ink-soft);
  position: relative; padding: .2rem 0; transition: color .25s var(--ease);
}
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 1.5px;
  background: var(--accent); transition: width .3s var(--ease);
}
.nav__links a:hover, .nav__links a.active { color: var(--ink); }
.nav__links a.active::after, .nav__links a:hover::after { width: 100%; }
.nav__actions { display: flex; align-items: center; gap: .5rem; }
.theme-toggle {
  display: grid; place-items: center; width: 34px; height: 34px;
  border: 1px solid var(--hairline); background: transparent; color: var(--ink);
  border-radius: 4px; cursor: pointer; transition: border-color .25s, color .25s;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
.nav__toggle { display: none; flex-direction: column; gap: 4px; width: 34px; height: 34px;
  border: 1px solid var(--hairline); background: transparent; border-radius: 4px; cursor: pointer; }
.nav__toggle span { display: block; height: 1.5px; background: var(--ink); margin: 0 7px; }

/* ===== Hero ===== */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--hairline); }
.hero__grid {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--rule) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 30% 30%, #000 0%, transparent 80%);
          mask-image: radial-gradient(ellipse 80% 70% at 30% 30%, #000 0%, transparent 80%);
  opacity: .7;
}
.hero__inner {
  position: relative; max-width: var(--maxw); margin: 0 auto;
  padding: clamp(3.5rem, 9vw, 7rem) 1.5rem clamp(3rem, 7vw, 5.5rem);
  display: grid; grid-template-columns: 1.5fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: center;
}
.hero__eyebrow { font-family: var(--mono); font-size: .78rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 1.1rem; }
.hero__name {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(2.6rem, 7vw, 4.4rem); line-height: 1.04; margin: 0 0 .8rem;
  letter-spacing: -.01em;
}
.hero__name-en { display: block; font-size: .42em; font-family: var(--mono);
  font-weight: 400; letter-spacing: .18em; color: var(--ink-soft); margin-top: .6rem; text-transform: uppercase; }
.hero__role { font-size: 1.05rem; color: var(--ink); margin: 0 0 1.1rem; font-weight: 500; }
.hero__role .dot { color: var(--ink-soft); margin: 0 .35rem; }
.hero__role-en { color: var(--muted); font-weight: 400; font-size: .92rem; }
.hero__unit { font-family: var(--mono); font-size: .82rem; color: var(--text); margin: 0 0 1.2rem; }
.hero__statement { font-size: 1.05rem; line-height: 1.7; color: var(--text); max-width: 52ch; margin: 0 0 1.1rem; }
.hero__keywords { font-size: .92rem; color: var(--muted); margin: 0 0 1.5rem; max-width: 50ch; }
.hero__tagline { font-size: 1.08rem; color: var(--ink-soft); max-width: 36ch; margin: 0 0 1.2rem; }
.hero__affil { font-family: var(--mono); font-size: .8rem; color: var(--ink-soft); margin: 0 0 1.4rem; }
.hero__links { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: .4rem 1.1rem; }
.hero__links a { text-decoration: none; font-size: .9rem; color: var(--ink); position: relative; }
.hero__links a::after { content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 1.5px;
  background: var(--accent); transition: width .3s var(--ease); }
.hero__links a:hover::after { width: 100%; }

.hero__aside { display: flex; flex-direction: column; gap: 1.2rem; align-items: flex-start; }
.portrait {
  width: 100%; max-width: 260px; aspect-ratio: 4/5;
  border: 1px solid var(--hairline); border-radius: var(--radius);
  background: var(--surface); display: grid; place-items: center; position: relative; overflow: hidden;
}
.portrait img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 24%; display: block; }
.portrait__seal { font-family: var(--serif); font-size: 4.5rem; color: var(--accent); opacity: .85; }
.portrait__cap { position: absolute; bottom: 10px; font-family: var(--mono); font-size: .68rem;
  color: var(--ink-soft); letter-spacing: .08em; }

/* ===== Section shell ===== */
.section { max-width: var(--maxw); margin: 0 auto; padding: var(--space) 1.5rem; border-bottom: 1px solid var(--hairline); }
.section__head { display: flex; align-items: baseline; gap: 1rem; margin-bottom: 2.4rem; }
.section__no { font-family: var(--mono); font-size: .8rem; color: var(--accent); letter-spacing: .1em; }
.section__title { font-family: var(--serif); font-weight: 500; font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  margin: 0; letter-spacing: -.01em; }
.section__ext { margin-left: auto; font-size: .82rem; text-decoration: none; color: var(--accent);
  font-family: var(--mono); border-bottom: 1px solid transparent; transition: border-color .25s; }
.section__ext:hover { border-color: var(--accent); }
.section__ext-note { margin-left: auto; font-family: var(--mono); font-size: .74rem; letter-spacing: .06em;
  text-transform: uppercase; color: var(--muted); }
.featured__more { font-family: var(--mono); font-size: .82rem; }

/* ===== Research ===== */
.research__grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px;
  background: var(--hairline); border: 1px solid var(--hairline); }
.research__item {
  position: relative; display: block; text-decoration: none; color: inherit;
  background: var(--paper); padding: 1.8rem 1.7rem 2.3rem; overflow: hidden;
  transition: background-color .35s var(--ease), transform .35s var(--ease), box-shadow .35s var(--ease);
}
.research__item::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--accent); transform: scaleY(0); transform-origin: top center;
  transition: transform .42s var(--ease);
}
.research__item:hover {
  background: var(--surface); transform: translateY(-4px);
  box-shadow: 0 16px 36px -22px rgba(20,59,83,.5);
}
.research__item:hover::before { transform: scaleY(1); }
.research__no { position: relative; display: inline-block; font-family: var(--mono);
  font-size: .78rem; color: var(--accent); transition: transform .35s var(--ease); }
.research__item:hover .research__no { transform: translateX(3px); }
.research__en { font-family: var(--mono); font-size: .76rem; color: var(--muted); margin: 0 0 .7rem; letter-spacing: .04em; }
.research__meta { font-family: var(--mono); font-size: .74rem; color: var(--accent); letter-spacing: .02em; }
.research__item h3 { position: relative; font-family: var(--serif); font-weight: 500;
  font-size: 1.22rem; margin: .6rem 0 .7rem; transition: transform .35s var(--ease); }
.research__item:hover h3 { transform: translateX(4px); }
.research__item p { position: relative; margin: 0; color: var(--ink-soft); font-size: .96rem;
  transition: transform .35s var(--ease); }
.research__item:hover p { transform: translateX(4px); }
.research__arrow {
  position: absolute; right: 1.5rem; bottom: 1.3rem; font-family: var(--serif);
  font-size: 1.35rem; line-height: 1; color: var(--accent);
  opacity: 0; transform: translateX(-8px); transition: opacity .35s var(--ease), transform .35s var(--ease);
}
.research__item:hover .research__arrow { opacity: 1; transform: none; }

/* ===== Publications year index (homepage) ===== */
.years__note { font-size: .92rem; color: var(--ink-soft); margin: 0 0 2rem; }
.years__note span { font-family: var(--mono); color: var(--accent); }
.years__grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 1px;
  background: var(--hairline); border: 1px solid var(--hairline); }
.yrcard { background: var(--paper); padding: 1.4rem 1.3rem; text-decoration: none;
  display: flex; flex-direction: column; gap: .35rem; transition: background-color .3s var(--ease); }
.yrcard:hover { background: var(--surface); }
.yrcard__year { font-family: var(--serif); font-weight: 500; font-size: 1.7rem; color: var(--ink); line-height: 1; }
.yrcard:hover .yrcard__year { color: var(--accent); }
.yrcard__count { font-family: var(--mono); font-size: .76rem; color: var(--ink-soft); letter-spacing: .04em; }

/* ===== Publications drill-down page ===== */
.pubpage { max-width: var(--maxw); margin: 0 auto; padding: clamp(2.4rem, 5vw, 4rem) 1.5rem var(--space); }
.pubpage__head { margin-bottom: 2.4rem; border-bottom: 1px solid var(--hairline); padding-bottom: 1.6rem; }
.back { font-family: var(--mono); font-size: .8rem; color: var(--ink-soft); text-decoration: none;
  display: inline-block; margin-bottom: 1.2rem; transition: color .25s; }
.back:hover { color: var(--accent); }
.pubpage__title { font-family: var(--serif); font-weight: 500; font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 .6rem; letter-spacing: -.01em; }
.pubpage__sub { font-size: .9rem; color: var(--ink-soft); margin: 0; font-family: var(--mono); }
.pubpage__sub span { color: var(--accent); }
.pubpage__sub a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color .25s; }
.pubpage__sub a:hover { border-color: var(--accent); }

.pubpage__body { display: grid; grid-template-columns: 132px 1fr; gap: clamp(1.5rem, 4vw, 3rem); align-items: start; }

.pubrail { position: sticky; top: 84px; display: flex; flex-direction: column; gap: .2rem;
  border-right: 1px solid var(--hairline); padding-right: 1rem; }
.pubrail__btn { display: flex; align-items: baseline; justify-content: space-between; gap: .5rem;
  background: transparent; border: none; cursor: pointer; text-align: left;
  padding: .45rem .2rem; color: var(--ink-soft); font-family: var(--sans);
  border-left: 2px solid transparent; margin-left: -1px; transition: color .25s, border-color .25s; }
.pubrail__btn:hover { color: var(--ink); }
.pubrail__btn.active { color: var(--accent); border-left-color: var(--accent); }
.pubrail__y { font-family: var(--serif); font-size: 1.15rem; font-weight: 500; }
.pubrail__c { font-family: var(--mono); font-size: .72rem; opacity: .8; }

.publist { min-width: 0; }
.publist__head { display: flex; align-items: baseline; gap: 1rem; margin-bottom: 1.2rem; }
.publist__year { font-family: var(--serif); font-size: 1.8rem; font-weight: 500; color: var(--accent); margin: 0; }
.publist__count { font-family: var(--mono); font-size: .82rem; color: var(--ink-soft); }

.pub__item { position: relative; padding: .95rem 0 .95rem 1.1rem; border-bottom: 1px solid var(--hairline); }
.pub__item::before { content: ""; position: absolute; left: 0; top: 1rem; bottom: 1rem; width: 2px;
  background: transparent; transition: background-color .3s var(--ease); }
.pub__item:hover::before { background: var(--accent); }
.pub__authors { font-size: .92rem; margin: 0 0 .25rem; color: var(--ink); }
.pub__authors .me { font-weight: 700; color: var(--accent); }
.pub__title { font-size: 1.02rem; margin: 0 0 .3rem; line-height: 1.45; font-weight: 500; }
.pub__venue { font-style: italic; color: var(--ink-soft); font-size: .9rem; margin: 0; }
.pub__venue .doi { font-style: normal; font-family: var(--mono); font-size: .76rem; color: var(--accent);
  margin-left: .6rem; text-decoration: none; border-bottom: 1px solid transparent; }
.pub__venue .doi:hover { border-color: var(--accent); }
.pub__badge { display: inline-block; font-family: var(--mono); font-size: .68rem; letter-spacing: .05em;
  color: var(--accent); background: var(--accent-soft); padding: .1rem .45rem; border-radius: 3px; margin-left: .5rem; }

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--hairline); }
.footer__inner { max-width: var(--maxw); margin: 0 auto; padding: 2.2rem 1.5rem;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1.2rem; align-items: flex-start; }
.footer__name { font-family: var(--serif); font-size: 1.05rem; margin: 0 0 .5rem; }
.footer__line { font-size: .85rem; color: var(--ink-soft); margin: 0; }
.footer__links { font-family: var(--mono); font-size: .78rem; color: var(--ink-soft); }
.footer__links a { text-decoration: none; color: var(--ink-soft); }
.footer__links a:hover { color: var(--accent); }
.footer__links span { margin: 0 .5rem; }

/* ===== Slim footer ===== */
.footer--slim .footer__inner { padding: 1.6rem 1.5rem; }
.footer__copy { font-family: var(--mono); font-size: .78rem; color: var(--ink-soft);
  margin: 0; letter-spacing: .02em; }

/* ===== Contact page ===== */
.contactpage { max-width: var(--maxw); margin: 0 auto; padding: clamp(2.4rem, 5vw, 4rem) 1.5rem var(--space); }
.contactpage__head { margin-bottom: 2.6rem; border-bottom: 1px solid var(--hairline); padding-bottom: 1.7rem; }
.contactpage__title { font-family: var(--serif); font-weight: 500; font-size: clamp(2.2rem, 6vw, 3.4rem);
  margin: 0 0 .7rem; letter-spacing: -.01em; }
.contactpage__sub { color: var(--ink-soft); font-size: 1rem; margin: 0; max-width: 56ch; }
.contact-grid { display: grid; grid-template-columns: 1.35fr 1fr; gap: clamp(2rem, 5vw, 4rem); align-items: start; }
.contact-col__label { font-family: var(--mono); font-size: .76rem; letter-spacing: .12em;
  text-transform: uppercase; color: var(--accent); margin: 0 0 1.3rem; }
.contact-field { display: grid; grid-template-columns: 5.5rem 1fr; gap: 1rem;
  padding: 1.15rem 0; border-bottom: 1px solid var(--hairline); }
.contact-field:first-of-type { border-top: 1px solid var(--hairline); }
.contact-field__k { font-family: var(--mono); font-size: .76rem; color: var(--ink-soft); padding-top: .3rem; }
.contact-field__v { font-size: 1.05rem; }
.contact-field__v a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--hairline);
  transition: color .25s var(--ease), border-color .25s var(--ease); }
.contact-field__v a:hover { color: var(--accent); border-color: var(--accent); }
.contact-field__v.is-mail { font-family: var(--mono); font-size: 1rem; }
.copy-btn { font-family: var(--mono); font-size: .72rem; color: var(--accent); background: none; border: none;
  cursor: pointer; margin-left: .6rem; padding: .1rem .4rem; border-radius: 3px; transition: background-color .2s var(--ease); }
.copy-btn:hover { background: var(--accent-soft); }
.contact-field__note { font-size: .85rem; color: var(--ink-soft); margin: .35rem 0 0; line-height: 1.6; }
.contact-profiles { display: flex; flex-direction: column; gap: 1px; background: var(--hairline);
  border: 1px solid var(--hairline); }
.contact-profile { background: var(--paper); padding: 1.35rem 1.4rem; display: flex;
  justify-content: space-between; align-items: center; text-decoration: none; color: inherit;
  transition: background-color .3s var(--ease); }
.contact-profile:hover { background: var(--surface); }
.contact-profile__name { font-family: var(--serif); font-size: 1.18rem; font-weight: 500; margin: 0; }
.contact-profile__desc { font-size: .82rem; color: var(--ink-soft); margin: .25rem 0 0; }
.contact-profile__arrow { font-family: var(--serif); font-size: 1.4rem; color: var(--accent); }

/* ===== Reveal ===== */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ===== Responsive ===== */
@media (max-width: 860px) {
  body { font-size: 16px; }
  .nav__links { position: fixed; top: 60px; left: 0; right: 0;
    flex-direction: column; gap: 0; background: var(--paper);
    border-bottom: 1px solid var(--hairline); padding: .5rem 1.5rem 1rem;
    transform: translateY(-130%); transition: transform .35s var(--ease); }
  .nav__links.open { transform: none; }
  .nav__links a { padding: .7rem 0; border-bottom: 1px solid var(--hairline); }
  .nav__links a::after { display: none; }
  .nav__toggle { display: flex; }
  .hero__inner { grid-template-columns: 1fr; }
  .hero__aside { flex-direction: row; align-items: center; }
  .portrait { max-width: 120px; }
  .research__grid { grid-template-columns: 1fr; }

  .pubpage__body { grid-template-columns: 1fr; }
  .pubrail { position: static; flex-direction: row; flex-wrap: wrap; gap: .3rem;
    border-right: none; border-bottom: 1px solid var(--hairline); padding: 0 0 1rem; margin-bottom: 1.4rem; }
  .pubrail__btn { border-left: none; border-bottom: 2px solid transparent; padding: .35rem .6rem; }
  .pubrail__btn.active { border-left: none; border-bottom-color: var(--accent); }
}
@media (max-width: 480px) {
  .footer__inner { flex-direction: column; }
}

/* ===== Hero metrics ===== */
.hero__stats { display: flex; gap: 2.4rem; margin: 1.7rem 0 0; padding: 0; }
.hero__stats > div { display: flex; flex-direction: column; }
.hero__stats dt { font-family: var(--mono); font-size: .7rem; letter-spacing: .08em;
  color: var(--ink-soft); text-transform: uppercase; }
.hero__stats dd { margin: .25rem 0 0; font-family: var(--serif); font-size: 1.7rem;
  font-weight: 500; color: var(--accent); line-height: 1; }
.hero__stats dd span { font-family: var(--mono); font-size: .6rem; color: var(--ink-soft);
  margin-left: .3rem; letter-spacing: .03em; }

/* ===== Publications filter ===== */
.pubfilter { display: flex; gap: .5rem; margin-bottom: 1.6rem; }
.topicfilter { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: .9rem; }
.topicfilter__btn { font-family: var(--sans); font-size: .88rem; background: transparent; border: 1px solid var(--hairline); color: var(--ink-soft); padding: .42rem .9rem; border-radius: 999px; cursor: pointer; transition: border-color .25s var(--ease), color .25s var(--ease), background-color .25s var(--ease); }
.topicfilter__btn:hover { border-color: var(--accent); color: var(--ink); }
.topicfilter__btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
[data-theme="dark"] .topicfilter__btn.active { color: #0d1b24; }
.topicfilter__c { font-family: var(--mono); font-size: .72rem; opacity: .65; margin-left: .3rem; }
.pubfilter__btn { font-family: var(--mono); font-size: .82rem; background: transparent;
  border: 1px solid var(--hairline); color: var(--ink-soft); padding: .35rem .9rem;
  border-radius: 3px; cursor: pointer; transition: all .25s var(--ease); }
.pubfilter__btn:hover { border-color: var(--accent); color: var(--ink); }
.pubfilter__btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }
[data-theme="dark"] .pubfilter__btn.active { color: #0d1b24; }
.publist__group { margin-bottom: 2.4rem; }
.publist__empty { color: var(--ink-soft); font-size: .95rem; margin: .5rem 0 0; }

/* ===== About page ===== */
.aboutpage { max-width: var(--maxw); margin: 0 auto; padding: clamp(2.4rem, 5vw, 4rem) 1.5rem var(--space); }
.aboutpage__head { margin-bottom: 2rem; }
.aboutpage__title { font-family: var(--serif); font-weight: 500; font-size: clamp(2rem, 5vw, 3rem);
  margin: 0; letter-spacing: -.01em; }
.aboutpage__body { display: grid; grid-template-columns: 1.6fr 1fr; gap: clamp(2rem, 5vw, 3.5rem); align-items: start; }
.about__bio { font-size: 1.02rem; color: var(--ink); margin: 0 0 1.2rem; max-width: 62ch; }
.about__bio strong { color: var(--accent); font-weight: 600; }
.about__h2 { font-family: var(--serif); font-weight: 500; font-size: 1.4rem; margin: 2.2rem 0 1.1rem;
  padding-bottom: .4rem; border-bottom: 1px solid var(--hairline); }
.about-timeline { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--hairline); }
.about-timeline li { display: grid; grid-template-columns: 6.5rem 1fr; gap: 1.4rem; padding: 1rem 0; border-bottom: 1px solid var(--hairline); }
.about-timeline__y { font-family: var(--mono); font-size: .9rem; color: var(--accent); }
.about-timeline h3 { font-family: var(--serif); font-weight: 500; font-size: 1.05rem; margin: 0 0 .25rem; }
.about-timeline p { margin: 0; color: var(--ink-soft); font-size: .9rem; }
.aboutpage__side { display: flex; flex-direction: column; gap: 1.5rem; }
.about__card { border: 1px solid var(--hairline); border-radius: 4px; padding: 1.4rem 1.5rem; background: var(--surface); }
.about__card .about__h2 { margin-top: 0; border: none; padding: 0 0 .8rem; font-size: 1.15rem; }
.about__interests { list-style: none; margin: 0; padding: 0; }
.about__interests li { padding: .5rem 0; border-bottom: 1px solid var(--hairline); font-size: .95rem; }
.about__interests li:last-child { border-bottom: none; }
.about__line { margin: 0 0 .7rem; font-size: .92rem; display: grid; grid-template-columns: 4rem 1fr; gap: .8rem; }
.about__line span { font-family: var(--mono); font-size: .72rem; color: var(--ink-soft); padding-top: .15rem; }
.about__line a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; }
.about__line a:hover { border-color: var(--accent); }
.about__links { display: flex; gap: 1rem; }
.about__links a { font-family: var(--mono); font-size: .8rem; }

/* ===== Responsive additions ===== */
@media (max-width: 1080px) {
  .nav__en { display: none; }
}
@media (max-width: 860px) {
  .aboutpage__body { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .hero__stats { gap: 1.6rem; flex-wrap: wrap; }
}

/* =========================================================
   升级组件 — 国际化 PI 学术主页
   （Hero 指标降级 / Selected Work / News / Honors / Research 页 / Team / Teaching / 搜索 / Lightbox）
   ========================================================= */

/* ---- Nav: CV 轻量按钮 ---- */
.nav__cv {
  font-family: var(--mono); font-size: .8rem; letter-spacing: .03em;
  text-decoration: none; color: var(--ink-soft);
  padding: .34rem .7rem; border: 1px solid var(--hairline); border-radius: var(--radius);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.nav__cv:hover { color: var(--accent); border-color: var(--accent); }

/* ---- Hero 指标降级：Academic Metrics ---- */
.hero__stats { display: flex; gap: 2.2rem; margin: 1.7rem 0 0; }
.hero__stats > div { display: flex; flex-direction: column; }
.hero__stats dt { font-family: var(--mono); font-size: .66rem; letter-spacing: .08em;
  color: var(--muted); text-transform: uppercase; }
.hero__stats dd { margin: .25rem 0 0; font-family: var(--serif); font-size: 1.22rem;
  font-weight: 500; color: var(--text); line-height: 1; }
.hero__stats dd span { font-family: var(--mono); font-size: .58rem; color: var(--muted);
  margin-left: .25rem; letter-spacing: .02em; }
.hero__stats .src { font-family: var(--mono); font-size: .6rem; color: var(--muted); margin-top: .25rem; }

/* ---- Selected Work（首页代表成果） ---- */
.featured { display: flex; flex-direction: column; }
.feat__item { display: grid; grid-template-columns: 5.5rem 1fr auto; gap: 1.3rem;
  align-items: baseline; padding: 1.3rem 0; border-bottom: 1px solid var(--line); }
.feat__year { font-family: var(--mono); font-size: .92rem; color: var(--accent); }
.feat__main { min-width: 0; }
.feat__title { font-family: var(--serif); font-size: 1.08rem; font-weight: 500; margin: 0 0 .35rem; line-height: 1.4; }
.feat__authors { font-size: .9rem; color: var(--muted); margin: 0 0 .3rem; }
.feat__desc { font-size: .9rem; color: var(--muted); margin: 0; }
.feat__journal { font-style: italic; font-size: .85rem; color: var(--muted); white-space: nowrap; text-align: right; }
.feat__sel { display: inline-block; font-family: var(--mono); font-size: .64rem; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted); border: 1px solid var(--line);
  padding: .12rem .42rem; border-radius: 3px; margin-left: .6rem; }

/* ---- Recent News（时间线） ---- */
.news { display: flex; flex-direction: column; }
.news__item { display: grid; grid-template-columns: 6.5rem 1fr; gap: 1.4rem;
  padding: 1.05rem 0; border-bottom: 1px solid var(--line); }
.news__date { font-family: var(--mono); font-size: .92rem; color: var(--accent); }
.news__type { display: block; font-family: var(--mono); font-size: .64rem; text-transform: uppercase;
  letter-spacing: .06em; color: var(--muted); margin-top: .25rem; }
.news__title { margin: 0 0 .25rem; font-size: 1.02rem; font-weight: 500; }
.news__text { margin: 0; color: var(--muted); font-size: .92rem; }
.news__item.is-todo { opacity: .55; }
.news__item.is-todo .news__title { color: var(--muted); }

/* ---- Selected Honors ---- */
.honors { display: flex; flex-direction: column; }
.honors__item { display: grid; grid-template-columns: 5.5rem 1fr; gap: 1.2rem;
  padding: .95rem 0; border-bottom: 1px solid var(--line); }
.honors__year { font-family: var(--mono); font-size: .92rem; color: var(--accent); }
.honors__award { font-weight: 500; font-size: 1rem; margin: 0 0 .2rem; }
.honors__org { color: var(--muted); font-size: .86rem; margin: 0; }

/* ---- Join the Group（首页收敛版） ---- */
.joinband { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
  margin-top: 0; }
.joinband__inner { max-width: var(--max-width); margin: 0 auto; padding: clamp(2rem,4vw,3rem) 1.5rem;
  display: flex; justify-content: space-between; align-items: center; gap: 1.6rem; flex-wrap: wrap; }
.joinband__title { font-family: var(--serif); font-weight: 500; font-size: clamp(1.4rem,3vw,1.9rem); margin: 0 0 .4rem; }
.joinband__sub { color: var(--muted); margin: 0; max-width: 52ch; }
.joinband__links { display: flex; gap: 1.3rem; flex-wrap: wrap; }

/* ---- 通用文字链接（Academic arrow link） ---- */
.arlink { font-family: var(--mono); font-size: .82rem; color: var(--accent); text-decoration: none;
  border-bottom: 1px solid transparent; transition: border-color .25s var(--ease); }
.arlink:hover { border-color: var(--accent); }
.arlink .arrow { display: inline-block; margin-left: .35rem; transition: transform .25s var(--ease); }
.arlink:hover .arrow { transform: translateX(3px); }

/* ---- Research 页：研究主题 ---- */
.research-page__intro { color: var(--muted); max-width: 60ch; margin: 0 0 .5rem; font-size: 1.02rem; }
.themes { display: flex; flex-direction: column; }
.theme { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(1.5rem,4vw,3rem);
  padding: 2.8rem 0; border-bottom: 1px solid var(--line); align-items: start; }
.theme:nth-child(even) .theme__visual { order: -1; }
.theme__no { font-family: var(--mono); color: var(--accent); font-size: .8rem; letter-spacing: .1em; }
.theme__zh { font-family: var(--serif); font-weight: 500; font-size: clamp(1.4rem,3vw,2rem); margin: .35rem 0 .15rem; }
.theme__en { font-family: var(--mono); font-size: .8rem; color: var(--muted); margin: 0 0 1.1rem; letter-spacing: .04em; }
.theme__q { color: var(--text); margin: 0 0 1.1rem; font-size: 1.02rem; }
.theme__methods { display: flex; flex-wrap: wrap; gap: .5rem; margin: 0 0 1.4rem; }
.tag { font-family: var(--mono); font-size: .74rem; color: var(--muted);
  border: 1px solid var(--line); padding: .2rem .6rem; border-radius: 3px; }
.theme__visual { position: relative; margin: 0; border: 1px solid var(--line); border-radius: var(--radius); aspect-ratio: 4/3;
  display: grid; place-items: center; color: var(--muted); font-family: var(--mono); font-size: .8rem;
  padding: 1rem; text-align: center; overflow: hidden; }
.theme__visual:has(img) { padding: 0; background: var(--surface); }
.theme__visual img { width: 100%; height: 100%; object-fit: cover; display: block; cursor: zoom-in;
  transition: transform .5s var(--ease), filter .5s var(--ease); }
.theme__visual:hover img { transform: scale(1.018); filter: saturate(1.04); }
.theme__visual figcaption { position: absolute; left: .65rem; right: .65rem; bottom: .65rem; margin: 0;
  padding: .42rem .58rem; text-align: left; background: rgba(12,18,22,.72); border-radius: 3px;
  -webkit-backdrop-filter: blur(5px); backdrop-filter: blur(5px); }
.theme__visual figcaption a { color: #f5f2ea; text-decoration: none; font-size: .68rem; letter-spacing: .02em; }
.theme__visual figcaption a:hover { text-decoration: underline; text-underline-offset: 2px; }
.theme__projtitle { font-family: var(--mono); font-size: .74rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 .6rem; }
.theme__proj { margin: 0 0 .8rem; padding-left: 1rem; border-left: 2px solid var(--line); }
.theme__proj h4 { font-family: var(--serif); font-weight: 500; font-size: 1rem; margin: 0 0 .2rem; }
.theme__proj p { margin: 0; color: var(--muted); font-size: .9rem; }
.theme__pubstitle { font-family: var(--mono); font-size: .74rem; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent); margin: 1.2rem 0 .7rem; }

/* ---- Team 页 ---- */
.people__intro { color: var(--muted); max-width: 60ch; margin: 0 0 2rem; }
.people-pi { display: grid; grid-template-columns: 220px 1fr; gap: 2rem; align-items: start;
  padding-bottom: 2.4rem; border-bottom: 1px solid var(--line); margin-bottom: 2rem; }
.people-pi__photo { width: 100%; aspect-ratio: 4/5; border: 1px solid var(--line); border-radius: var(--radius);
  display: grid; place-items: center; background: var(--surface); overflow: hidden; }
.people-pi__photo img { width: 100%; height: 100%; object-fit: cover; object-position: 50% 24%; display: block; }
.people-pi__photo .portrait__seal { font-size: 4rem; }
.people-pi__name { font-family: var(--serif); font-weight: 500; font-size: clamp(1.5rem,3vw,2rem); margin: 0 0 .2rem; }
.people-pi__en { font-family: var(--mono); font-size: .85rem; color: var(--muted); margin: 0 0 1rem; letter-spacing: .04em; }
.people-pi__role { color: var(--text); margin: 0 0 1rem; }
.people-pi__interests { display: flex; flex-wrap: wrap; gap: .5rem; margin: 0 0 1.2rem; }
.people-pi__links { display: flex; gap: 1.2rem; flex-wrap: wrap; }
.people-group { margin-bottom: 2.2rem; }
.people-group__title { font-family: var(--mono); font-size: .82rem; letter-spacing: .1em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 1rem; padding-bottom: .4rem; border-bottom: 1px solid var(--line); }
.student { display: grid; grid-template-columns: 56px 1fr; gap: 1rem; padding: 1rem 0; border-bottom: 1px solid var(--line); }
.student__avatar { width: 56px; height: 56px; border: 1px solid var(--line); border-radius: var(--radius);
  display: grid; place-items: center; font-family: var(--serif); font-size: 1.5rem; color: var(--accent); background: var(--surface); }
.student__name { font-weight: 500; font-size: 1.02rem; }
.student__meta { color: var(--muted); font-size: .88rem; margin: .15rem 0 0; }
.student__empty { color: var(--muted); font-size: .92rem; padding: .8rem 0; }
.mentoring-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); margin-bottom: .8rem; }
.mentor-stat { display: flex; flex-direction: column; min-height: 150px; padding: 1.2rem; background: var(--surface); }
.mentor-stat strong { font-family: var(--serif); font-size: 2.4rem; line-height: 1; color: var(--accent); font-weight: 500; }
.mentor-stat span { margin-top: .8rem; font-weight: 600; }
.mentor-stat small { margin-top: auto; color: var(--muted); font-family: var(--mono); font-size: .7rem; }
.privacy-note { color: var(--muted); font-size: .82rem; margin: .7rem 0 0; }
.outcome { display: grid; grid-template-columns: 7rem 1fr; gap: 1.2rem; padding: 1.2rem 0; border-bottom: 1px solid var(--line); }
.outcome > span { color: var(--accent); font-family: var(--mono); font-size: .78rem; }
.outcome h3 { font-family: var(--serif); font-weight: 500; font-size: 1.05rem; margin: 0 0 .25rem; }
.outcome h3 a { text-decoration: none; }
.outcome h3 a:hover { color: var(--accent); }
.outcome p { color: var(--muted); margin: 0; font-size: .9rem; }

/* ---- Teaching 页 ---- */
.course { padding: 1.25rem 0; border-bottom: 1px solid var(--line); }
.course__name { font-family: var(--serif); font-weight: 500; font-size: 1.2rem; margin: 0 0 .15rem; }
.course__en { font-family: var(--mono); font-size: .8rem; color: var(--muted); margin: 0 0 .4rem; }
.course__meta { font-family: var(--mono); font-size: .76rem; color: var(--muted); margin: 0 0 .5rem; }
.course__meta span { margin-right: 1rem; }
.course__desc { color: var(--text); margin: 0; max-width: 64ch; }
.course__link { display: inline-block; margin-top: .65rem; color: var(--accent); font-family: var(--mono); font-size: .76rem; text-decoration: none; border-bottom: 1px solid var(--line); }
.news__title a { text-decoration: none; }
.news__title a:hover { color: var(--accent); }

/* ---- Publications 搜索 ---- */
.pubsearch { margin-bottom: 1.4rem; }
.pubsearch input { width: 100%; font-family: var(--sans); font-size: .95rem; padding: .65rem .9rem;
  border: 1px solid var(--line); background: var(--surface); color: var(--text); border-radius: var(--radius); }
.pubsearch input::placeholder { color: var(--muted); }
.pubsearch input:focus { outline: none; border-color: var(--accent); }
.pub__links { display: flex; gap: 1.1rem; flex-wrap: wrap; margin-top: .5rem; }
.pub__link { font-family: var(--mono); font-size: .76rem; color: var(--accent); text-decoration: none;
  border-bottom: 1px solid transparent; transition: border-color .25s var(--ease); }
.pub__link:hover { border-color: var(--accent); }
.pub__badge { display: inline-block; font-family: var(--mono); font-size: .68rem; letter-spacing: .05em;
  color: var(--accent); background: var(--accent-soft); padding: .1rem .45rem; border-radius: 3px; margin-left: .5rem; }

/* ---- Lightbox（点击科研图片预览，无图时惰性） ---- */
.lightbox { position: fixed; inset: 0; background: rgba(0,0,0,.82); display: grid; place-items: center; z-index: 200;
  opacity: 0; pointer-events: none; transition: opacity .25s var(--ease); }
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox img { max-width: 90vw; max-height: 85vh; border: 1px solid rgba(255,255,255,.2); }
.lightbox__cap { position: absolute; bottom: 1.5rem; color: #eee; font-family: var(--mono); font-size: .8rem; }
.lightbox__close { position: absolute; top: 1.2rem; right: 1.2rem; width: 42px; height: 42px; border: 1px solid rgba(255,255,255,.4); border-radius: 50%; background: rgba(0,0,0,.25); color: #fff; font: 1.5rem/1 var(--sans); cursor: pointer; }
[data-lightbox] img, [data-zoom] { cursor: zoom-in; }

/* ---- CV 操作 ---- */
.cv-actions { display: flex; flex-wrap: wrap; gap: .8rem; }
.cvbtn { display: inline-block; font-family: var(--mono); font-size: .82rem; color: var(--accent); background: transparent;
  border: 1px solid var(--accent); padding: .55rem 1rem; border-radius: var(--radius); cursor: pointer; text-decoration: none; }
.cvbtn:hover { color: var(--paper); background: var(--accent); }

/* ---- Toast（Copy email） ---- */
.toast { position: fixed; bottom: 1.5rem; left: 50%; transform: translateX(-50%) translateY(10px);
  background: var(--ink); color: var(--paper); font-family: var(--mono); font-size: .82rem;
  padding: .6rem 1.1rem; border-radius: var(--radius); opacity: 0; pointer-events: none;
  transition: opacity .25s var(--ease), transform .25s var(--ease); z-index: 300; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---- Page transition overlay（导航跳转淡出，避免突兀） ---- */
.transition-overlay {
  position: fixed; inset: 0; background: var(--paper);
  opacity: 0; pointer-events: none; z-index: 400;
  transition: opacity .26s var(--ease);
}
.transition-overlay.active { opacity: 1; pointer-events: auto; }
@media (prefers-reduced-motion: reduce) { .transition-overlay { transition: none; } }

/* ---- 页面进入淡入（与退出淡出呼应，跳转更连贯） ---- */
@keyframes pageEnter {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}
.main-enter { animation: pageEnter .5s var(--ease) both; }
@media (prefers-reduced-motion: reduce) { .main-enter { animation: none; } }

/* ---- 响应式：新组件 ---- */
@media (max-width: 860px) {
  .feat__item { grid-template-columns: 4.5rem 1fr; }
  .feat__journal { grid-column: 2; white-space: normal; text-align: left; margin-top: .2rem; }
  .theme { grid-template-columns: 1fr; }
  .theme:nth-child(even) .theme__visual { order: 0; }
  .people-pi { grid-template-columns: 1fr; }
  .people-pi__photo { max-width: 200px; }
  .mentoring-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .feat__item { grid-template-columns: 1fr; gap: .3rem; }
  .feat__year { font-size: .8rem; }
  .news__item, .honors__item { grid-template-columns: 1fr; gap: .2rem; }
  .joinband__inner { flex-direction: column; align-items: flex-start; }
  .outcome { grid-template-columns: 1fr; gap: .3rem; }
}

/* ===== Print ===== */
@media print {
  .nav, .theme-toggle, .nav__toggle, .hero__grid, .back, .pubfilter, .topicfilter, .portrait, .footer--slim, .contact-profile__arrow, .cv-actions, .transition-overlay, .toast { display: none !important; }
  body { background: #fff !important; color: #000 !important; font-size: 11pt; }
  a { color: #000 !important; text-decoration: none; }
  .hero, .section, .pubpage, .aboutpage { border: none !important; padding: 0 !important; }
  .hero__stats dd { color: #000 !important; }
  .reveal { opacity: 1 !important; transform: none !important; }
  .pub__item::before { display: none !important; }
  .pub__title { font-weight: 600; }
  .pub__venue { font-style: italic; }
  .about__card { border: none !important; background: #fff !important; padding: 0 !important; }
  .aboutpage__body { grid-template-columns: 1fr; }
  .aboutpage__head { margin-bottom: 1rem; }
  .about__h2 { break-after: avoid; margin-top: 1.2rem; }
  .about-timeline li, .honors__item { break-inside: avoid; }
}