/* ============================================================
   记忆与推理课题组 · Memory & Reasoning Lab
   Visual system — "Scholar's Archive"
   暖纸张底 · 深海军蓝墨 · 敦煌赭金 · 编辑体衬线 + 研究体等宽
   ============================================================ */

/* ── 1. Design tokens ──────────────────────────────────── */
:root{
  /* paper & ink */
  --paper:#FBF8F1;
  --paper-2:#F4EFE3;
  --paper-3:#ECE3D2;
  --ink:#1C2A33;
  --ink-soft:#41505A;

  /* brand navy */
  --navy:#062A45;
  --navy-2:#0C3A5C;
  --navy-3:#13496E;

  /* dunhuang gold */
  --gold:#A6701C;          /* contrast-safe accent on paper */
  --gold-bright:#F2A81D;   /* decorative fills / on-navy */
  --gold-wash:rgba(178,124,36,.10);

  /* lines & neutrals */
  --line:#E4DBC9;
  --line-2:#D3C7AF;
  --muted:#7C7663;
  --on-navy:#ECF2F8;
  --on-navy-muted:#9BB4C6;

  --link:#0C3A5C;

  /* type */
  --serif:"Newsreader",Georgia,"Times New Roman",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;

  /* metrics */
  --wrap:1140px;
  --read:46rem;
  --gap:clamp(18px,2.4vw,30px);
  --radius:3px;
  --ease:cubic-bezier(.22,.61,.36,1);

  /* ── depth: warm-tinted multi-layer shadows (navy key + warm contact + top inset highlight) ── */
  --sh-navy-1:rgba(6,42,69,.05); --sh-navy-2:rgba(6,42,69,.08);
  --sh-navy-3:rgba(6,42,69,.12); --sh-navy-4:rgba(6,42,69,.16);
  --sh-warm:rgba(43,30,12,.06);  --sh-warm-2:rgba(43,30,12,.10);
  --hl-top:inset 0 1px 0 rgba(255,255,255,.55);
  --hl-top-soft:inset 0 1px 0 rgba(255,255,255,.4);
  --shadow-xs:var(--hl-top-soft),0 1px 1px var(--sh-warm),0 1px 2px var(--sh-navy-1);
  --shadow-sm:var(--hl-top),0 1px 1px var(--sh-warm),0 2px 4px var(--sh-navy-2),0 4px 8px var(--sh-navy-1);
  --shadow-md:var(--hl-top),0 1px 2px var(--sh-warm-2),0 4px 10px -2px var(--sh-navy-2),0 10px 22px -8px var(--sh-navy-3);
  --shadow-lg:var(--hl-top),0 2px 4px var(--sh-warm-2),0 8px 18px -4px var(--sh-navy-3),0 20px 40px -12px var(--sh-navy-4);
  --shadow-xl:0 4px 8px var(--sh-warm-2),0 14px 30px -6px var(--sh-navy-3),0 34px 64px -16px var(--sh-navy-4);
  --shadow-press:inset 0 2px 4px var(--sh-navy-3),inset 0 1px 1px var(--sh-warm-2);
  --shadow-glow-gold:0 0 0 3px rgba(242,168,29,.22);
  --shadow-sticky:inset 0 -1px 0 rgba(255,255,255,.4),0 1px 0 var(--line),0 6px 16px -10px var(--sh-navy-3);

  /* ── refined hairlines (replace flat 1px lines) ── */
  --hair:linear-gradient(90deg,var(--line-2) 0%,var(--line) 35%,rgba(211,199,175,.22) 88%,transparent 100%);
  --hair-center:linear-gradient(180deg,transparent 0%,var(--line) 22%,var(--line-2) 50%,var(--line) 78%,transparent 100%);
  --press-dark:rgba(6,42,69,.10); --press-light:rgba(255,255,255,.55);

  /* ── motion timing ── */
  --ease-out:cubic-bezier(.4,0,.2,1); --dur-1:.2s; --dur-2:.32s; --dur-3:.62s;
}

/* ── 2. Reset & base ───────────────────────────────────── */
*{box-sizing:border-box}
html{font-size:16px;-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink);
  background:var(--paper);
  line-height:1.85;
  letter-spacing:.005em;
  font-feature-settings:"kern" 1;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
/* whisper-quiet engineering grid behind everything */
body::before{
  content:"";
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:
    linear-gradient(rgba(6,42,69,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(6,42,69,.035) 1px,transparent 1px);
  background-size:34px 34px;
  mask-image:radial-gradient(circle at 50% 30%,#000,transparent 90%);
  -webkit-mask-image:radial-gradient(circle at 50% 30%,#000,transparent 90%);
}
img{max-width:100%;height:auto;display:block}
a{color:var(--link);text-decoration:none;transition:color .2s var(--ease)}
a:hover{color:var(--gold)}
strong{font-weight:600;color:var(--ink)}
em{font-style:normal}
::selection{background:rgba(242,168,29,.28);color:var(--navy)}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:2px}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding-inline:clamp(20px,5vw,48px)}
.page{padding-block:clamp(40px,6vw,76px)}

.skip-link{position:absolute;left:-999px;top:0}
.skip-link:focus{left:12px;top:12px;background:var(--navy);color:#fff;padding:10px 16px;z-index:100;border-radius:var(--radius)}

/* ── 3. Shared type atoms ──────────────────────────────── */
.eyebrow{
  font-family:var(--mono);
  font-size:.72rem;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--gold);
  margin:0 0 .9rem;
  display:flex;align-items:center;gap:.7em;
}
.eyebrow::before{
  content:"";width:1.6em;height:2px;background:var(--gold-bright);flex:none;
}
.prose{margin:0 0 1.1em;max-width:var(--read);color:var(--ink-soft)}
.prose.lead,.lead{font-size:1.075rem;color:var(--ink);max-width:var(--read)}
.prose__label{
  font-family:var(--mono);font-size:.68rem;font-weight:600;letter-spacing:.12em;
  text-transform:uppercase;color:var(--gold);
  border:1px solid var(--line-2);border-radius:2px;padding:.1em .5em;margin-right:.7em;
  display:inline-block;vertical-align:.12em;
}
.muted-note{font-size:.85rem;color:var(--muted);margin:-.4rem 0 1rem}
.empty-state{color:var(--muted);font-style:italic}

/* section header: 02 — 标题 — English */
.section{margin-bottom:clamp(40px,6vw,72px)}
.section-head{
  display:flex;align-items:baseline;gap:1rem;
  margin:0 0 1.6rem;padding-bottom:.9rem;
  border-bottom:1px solid var(--line);
}
.section-num{
  font-family:var(--mono);font-size:.8rem;font-weight:600;letter-spacing:.05em;
  color:var(--gold);flex:none;
  padding-top:.35em;
}
.section-title{
  font-family:var(--sans);font-weight:700;
  font-size:clamp(1.3rem,2.5vw,1.72rem);
  letter-spacing:.01em;color:var(--navy);margin:0;line-height:1.25;
}
.section-en{
  font-family:var(--serif);font-style:italic;font-size:1.02rem;
  color:var(--muted);margin-left:auto;flex:none;align-self:baseline;
  white-space:nowrap;
}

/* lists */
.bullet-list{margin:0 0 1em;padding-left:1.25em;max-width:var(--read)}
.bullet-list li{margin:.5em 0;color:var(--ink-soft)}
.bullet-list ul{margin:.4em 0;padding-left:1.1em}
.lined-list{list-style:none;margin:0;padding:0;max-width:var(--read)}
.lined-list li{
  position:relative;padding:.7em 0 .7em 1.6em;
  border-bottom:1px solid var(--line);color:var(--ink-soft);
}
.lined-list li::before{
  content:"";position:absolute;left:0;top:1.25em;
  width:8px;height:8px;border:1.5px solid var(--gold);transform:rotate(45deg);
}

/* ── 4. Masthead ───────────────────────────────────────── */
.masthead{
  position:sticky;top:0;z-index:40;
  background:rgba(251,248,241,.82);
  backdrop-filter:saturate(140%) blur(10px);
  -webkit-backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--line);
}
.masthead__bar{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  min-height:74px;padding-block:12px;
}
.wordmark{display:flex;align-items:center;gap:.85rem;color:var(--navy)}
.wordmark:hover{color:var(--navy)}
.wordmark__text{display:flex;flex-direction:column;line-height:1.15}
.wordmark__zh{font-weight:700;font-size:1.06rem;letter-spacing:.04em;color:var(--navy)}
.wordmark__en{font-family:var(--mono);font-size:.6rem;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-top:.18em}

.site-nav__list{display:flex;flex-wrap:wrap;gap:clamp(2px,1.4vw,18px);list-style:none;margin:0;padding:0}
.site-nav__link{
  display:block;position:relative;padding:.6em .5em;
  color:var(--ink-soft);font-size:.95rem;font-weight:500;letter-spacing:.02em;
}
.site-nav__link::after{
  content:"";position:absolute;left:.5em;right:.5em;bottom:.25em;height:2px;
  background:var(--gold-bright);transform:scaleX(0);transform-origin:left;
  transition:transform .28s var(--ease);
}
.site-nav__link:hover{color:var(--navy)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link.is-active{color:var(--navy);font-weight:600}
.site-nav__link.is-active::after{transform:scaleX(1)}

/* ── 5. Hero ───────────────────────────────────────────── */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero::before{ /* sharper grid local to hero */
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(6,42,69,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(6,42,69,.05) 1px,transparent 1px);
  background-size:34px 34px;
  mask-image:linear-gradient(to bottom,#000,transparent 80%);
  -webkit-mask-image:linear-gradient(to bottom,#000,transparent 80%);
}
.hero::after{ /* warm glow */
  content:"";position:absolute;top:-30%;right:-10%;width:60%;height:120%;z-index:0;
  background:radial-gradient(closest-side,rgba(242,168,29,.16),transparent 70%);
  pointer-events:none;
}
.hero__inner{position:relative;z-index:1;padding-block:clamp(56px,9vw,118px)}
.eyebrow--hero{font-size:.76rem;margin-bottom:1.4rem}
.hero__title{
  font-family:var(--sans);font-weight:800;
  font-size:clamp(2.6rem,7vw,5rem);line-height:1.04;letter-spacing:.01em;
  color:var(--navy);margin:0;
}
.hero__title-en{
  font-family:var(--serif);font-style:italic;font-weight:500;
  font-size:clamp(1.2rem,2.6vw,1.85rem);color:var(--gold);
  margin:.5rem 0 0;letter-spacing:.01em;
}
.hero__lead{
  margin:1.8rem 0 0;max-width:40rem;
  font-size:clamp(1.02rem,1.6vw,1.2rem);line-height:1.8;color:var(--ink-soft);
}
.hero__lead em{color:var(--navy);font-weight:600;font-style:normal}
.hero__lead strong{color:var(--navy)}
.hero__domains{
  list-style:none;margin:clamp(40px,6vw,68px) 0 0;padding:0;
  display:grid;grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line-2);
}
.hero__domains li{
  display:flex;flex-direction:column;gap:.35rem;
  padding:1.3rem 1.4rem 1.3rem 0;border-right:1px solid var(--line);
}
.hero__domains li:last-child{border-right:0}
.hero__domain-idx{font-family:var(--mono);font-size:.72rem;color:var(--gold);letter-spacing:.1em}
.hero__domain-zh{font-size:1.18rem;font-weight:700;color:var(--navy)}
.hero__domain-en{font-family:var(--serif);font-style:italic;font-size:.9rem;color:var(--muted)}

/* ── 6. Bands ──────────────────────────────────────────── */
.band{border-bottom:1px solid var(--line)}
.band--pi{background:var(--paper-2)}

/* PI block */
.pi{
  display:grid;grid-template-columns:250px 1fr;gap:clamp(28px,5vw,64px);
  align-items:start;padding-block:clamp(48px,7vw,88px);
}
.pi__media{margin:0;position:relative}
.pi__photo{
  width:100%;border-radius:var(--radius);
  border:1px solid var(--line-2);
  box-shadow:18px 18px 0 -2px var(--paper-3),18px 18px 0 -1px var(--line-2);
}
.pi__cap{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--muted);margin-top:1.2rem;text-align:center;
}
.pi__body{padding-top:.4rem}
.pi__name{
  font-family:var(--sans);font-weight:800;font-size:clamp(1.8rem,3.4vw,2.6rem);
  color:var(--navy);margin:.2rem 0 .3rem;line-height:1.1;
}
.pi__name-en{font-family:var(--serif);font-style:italic;font-weight:500;font-size:.5em;color:var(--gold);margin-left:.5em;letter-spacing:.01em}
.pi__role{font-size:.95rem;color:var(--muted);margin:0 0 1.3rem;letter-spacing:.02em}
.pi__facts{
  list-style:none;margin:1.5rem 0 0;padding:0;
  display:grid;gap:.55rem;border-top:1px solid var(--line);padding-top:1.3rem;
}
.pi__facts li{
  position:relative;padding-left:1.5em;font-size:.92rem;color:var(--ink-soft);
}
.pi__facts li::before{
  content:"—";position:absolute;left:0;color:var(--gold);font-family:var(--mono)
}

/* ── 7. Research ───────────────────────────────────────── */
.research{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.4fr);gap:clamp(28px,4vw,56px)}
.research__theory .lined-list li:first-child{border-top:0}
.domain-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line)}
.domain-card{background:var(--paper);padding:1.5rem 1.4rem;transition:background .3s var(--ease)}
.domain-card:hover{background:var(--paper-2)}
.domain-card__idx{font-family:var(--mono);font-size:.72rem;color:var(--gold);letter-spacing:.1em}
.domain-card__title{font-size:1.18rem;font-weight:700;color:var(--navy);margin:.5rem 0 .5rem}
.domain-card__text{font-size:.9rem;color:var(--ink-soft);margin:0;line-height:1.7}

/* ── 8. Recruit panel ──────────────────────────────────── */
.recruit{
  position:relative;background:var(--navy);color:var(--on-navy);
  border-radius:var(--radius);padding:clamp(28px,4vw,46px);overflow:hidden;
}
.recruit::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:5px;background:var(--gold-bright);
}
.recruit::after{
  content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;
  background:radial-gradient(closest-side,rgba(242,168,29,.18),transparent 70%);
}
.recruit__lead{font-size:1.1rem;line-height:1.8;margin:0 0 1.2rem;color:#fff;max-width:none;position:relative;z-index:1}
.recruit__lead strong{color:var(--gold-bright)}
.recruit .bullet-list{max-width:none;position:relative;z-index:1;margin:0}
.recruit .bullet-list li{color:var(--on-navy-muted)}
.recruit .bullet-list li::marker{color:var(--gold-bright)}

/* ── 9. Features ───────────────────────────────────────── */
.feature-grid{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);margin-top:1.6rem;
}
.feature{background:var(--paper);padding:1.4rem 1.4rem;display:flex;flex-direction:column;gap:.6rem}
.feature__key{
  font-weight:700;color:var(--navy);font-size:1.02rem;
  display:inline-flex;align-items:center;gap:.5em;
}
.feature__key::before{content:"";width:7px;height:7px;background:var(--gold-bright);transform:rotate(45deg)}
.feature__text{margin:0;font-size:.9rem;color:var(--ink-soft);line-height:1.7}

/* ── 10. Timeline (news) ───────────────────────────────── */
.timeline{list-style:none;margin:0;padding:0;max-width:var(--read);position:relative}
.timeline::before{content:"";position:absolute;left:6.5em;top:.6em;bottom:.6em;width:1px;background:var(--line-2)}
.timeline__item{display:grid;grid-template-columns:6.5em 1fr;gap:1.6em;padding:.85em 0;position:relative}
.timeline__date{
  font-family:var(--mono);font-size:.8rem;color:var(--muted);
  font-variant-numeric:tabular-nums;text-align:right;padding-top:.15em;letter-spacing:.02em;
}
.timeline__text{margin:0;position:relative;color:var(--ink-soft);padding-left:1.4em}
.timeline__text::before{
  content:"";position:absolute;left:-.42em;top:.6em;width:9px;height:9px;border-radius:50%;
  background:var(--paper);border:2px solid var(--gold);transform:translateX(-50%);
}

/* ── 11. Courses ───────────────────────────────────────── */
.course-list{list-style:none;margin:0;padding:0;max-width:var(--read)}
.course{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:.4em 1em;
  padding:.85em 0;border-bottom:1px solid var(--line);
}
.course__name{font-weight:600;color:var(--navy);font-size:1.02rem}
.course__note{font-family:var(--mono);font-size:.76rem;color:var(--muted);letter-spacing:.02em;margin-left:auto}

/* ── 12. Page head (inner pages) ───────────────────────── */
.page-head{margin:0 0 clamp(34px,5vw,56px)}
.page-title{
  font-family:var(--sans);font-weight:800;color:var(--navy);
  font-size:clamp(2rem,4.6vw,3.1rem);line-height:1.1;margin:0;letter-spacing:.01em;
}
.detail__subtitle{font-family:var(--serif);font-style:italic;font-size:1.1rem;color:var(--muted);margin:.6rem 0 0}

/* ── 13. Cards ─────────────────────────────────────────── */
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,290px),1fr));gap:var(--gap)}
.card{
  display:flex;flex-direction:column;background:var(--paper);
  border:1px solid var(--line);border-radius:var(--radius);
  position:relative;overflow:hidden;transition:border-color .3s var(--ease),transform .3s var(--ease),box-shadow .3s var(--ease);
}
.card::before{
  content:"";position:absolute;left:0;top:0;height:3px;width:100%;
  background:var(--gold-bright);transform:scaleX(0);transform-origin:left;
  transition:transform .35s var(--ease);
}
.card:hover{transform:translateY(-3px);border-color:var(--line-2);box-shadow:0 14px 30px -18px rgba(6,42,69,.4)}
.card:hover::before{transform:scaleX(1)}
.card__body{padding:1.5rem 1.5rem 1.2rem;flex:1}
.card__eyebrow{
  font-family:var(--mono);font-size:.68rem;font-weight:600;letter-spacing:.14em;
  text-transform:uppercase;color:var(--gold);display:inline-block;margin-bottom:.7rem;
}
.card__title{font-size:1.18rem;font-weight:700;color:var(--navy);margin:0 0 .6rem;line-height:1.35}
.card__title a{color:inherit}
.card__title a:hover{color:var(--gold)}
.card__text{margin:0;font-size:.92rem;color:var(--ink-soft);line-height:1.7}
.card__specs{display:flex;flex-wrap:wrap;gap:.4rem 1.4rem;margin:1rem 0 0}
.card__specs div{display:flex;gap:.4em;font-size:.8rem}
.card__specs dt{color:var(--muted);font-family:var(--mono);letter-spacing:.04em}
.card__specs dd{margin:0;color:var(--ink-soft)}
.card__tags{margin:0 0 .8rem;display:flex;flex-wrap:wrap;gap:.4rem}
.card__more{
  display:flex;align-items:center;justify-content:space-between;
  padding:.95rem 1.5rem;border-top:1px solid var(--line);
  font-family:var(--mono);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--navy);font-weight:500;
}
.card__more:hover{color:var(--gold);background:var(--paper-2)}
.card__arrow{transition:transform .3s var(--ease)}
.card:hover .card__arrow{transform:translateX(4px)}

/* ── 14. Members ───────────────────────────────────────── */
.member-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,180px),1fr));gap:var(--gap)}
.member-card{
  text-align:center;padding:1.8rem 1.2rem;background:var(--paper);
  border:1px solid var(--line);border-radius:var(--radius);
}
.member-card__photo{
  width:88px;height:88px;border-radius:50%;object-fit:cover;margin:0 auto 1rem;
  border:1px solid var(--line-2);
}
.member-card__photo--placeholder{
  display:flex;align-items:center;justify-content:center;
  background:var(--paper-2);color:var(--gold);font-family:var(--serif);font-size:1.8rem;
}
.member-card__name{font-size:1.1rem;font-weight:700;color:var(--navy);margin:0 0 .35rem}
.member-card__en{font-family:var(--serif);font-style:italic;font-weight:400;font-size:.82rem;color:var(--muted)}
.member-card__role{font-size:.86rem;color:var(--ink-soft);margin:.2rem 0}
.member-card__meta{font-size:.8rem;color:var(--muted);margin:.2rem 0;font-family:var(--mono)}

.alumni-list{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:.65rem}
.alumni{
  background:var(--paper);border:1px solid var(--line);border-radius:999px;
  padding:.45rem 1.1rem;font-size:.92rem;color:var(--ink-soft);
  transition:border-color .25s var(--ease),color .25s var(--ease),background .25s var(--ease);
}
.alumni:hover{border-color:var(--gold);color:var(--navy);background:var(--gold-wash)}

/* ── 15. Publications ──────────────────────────────────── */
.section-head--year{border-bottom-color:var(--line-2)}
.section-head--year .section-num{font-size:1.2rem;color:var(--navy);font-weight:600}
.pub-list{list-style:none;margin:0;padding:0}
.pub{
  display:grid;grid-template-columns:8.5rem 1fr;gap:1.4rem;align-items:start;
  padding:1.2rem 0;border-bottom:1px solid var(--line);
}
.pub__venue{
  font-family:var(--mono);font-size:.72rem;font-weight:600;letter-spacing:.06em;
  color:var(--gold);border:1px solid var(--line-2);border-radius:2px;
  padding:.3em .6em;text-align:center;justify-self:start;line-height:1.3;
}
.pub__body{min-width:0}
.pub__title{font-size:1.06rem;font-weight:600;color:var(--navy);margin:0 0 .35rem;line-height:1.45}
.pub__meta{margin:0;color:var(--muted);font-size:.9rem}
.pub__badge{display:inline-block;font-family:var(--mono);font-size:.62rem;font-weight:500;letter-spacing:.05em;color:var(--gold);border:1px solid var(--line-2);border-radius:2px;padding:.12em .45em;margin-left:.35em;vertical-align:.14em;white-space:nowrap;box-shadow:inset 0 1px 0 rgba(255,255,255,.5)}
.pub__links{margin:.6rem 0 0;display:flex;gap:1rem;font-family:var(--mono);font-size:.76rem;letter-spacing:.06em;text-transform:uppercase}

/* ── 16. Grants ────────────────────────────────────────── */
.grant-list{list-style:none;margin:0;padding:0;counter-reset:none}
.grant{
  display:grid;grid-template-columns:2.4rem 1fr;gap:.2rem 1.2rem;align-items:baseline;
  padding:1rem 0;border-bottom:1px solid var(--line);
}
.grant__idx{
  grid-row:span 2;font-family:var(--mono);font-size:.95rem;color:var(--gold);
  font-weight:600;font-variant-numeric:tabular-nums;
}
.grant__title{font-weight:600;color:var(--navy);font-size:1rem;line-height:1.5}
.grant__meta{color:var(--muted);font-size:.85rem;font-family:var(--mono);letter-spacing:.01em}

/* ── 17. Detail pages ──────────────────────────────────── */
.detail .prose__label{}
.detail .prose{max-width:none}
.img-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,300px),1fr));gap:var(--gap)}
.img-grid__item{margin:0}
.img-grid__item img{width:100%;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
.meta-list{display:flex;flex-wrap:wrap;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;margin:0 0 1.8rem}
.meta-list div{background:var(--paper);padding:.8rem 1.2rem;display:flex;flex-direction:column;gap:.2rem;flex:1;min-width:120px}
.meta-list dt{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.meta-list dd{margin:0;font-weight:600;color:var(--navy)}
.detail__actions{display:flex;flex-wrap:wrap;gap:.9rem;margin:0 0 2rem}
.back-link{margin-top:2.5rem;font-family:var(--mono);font-size:.8rem;letter-spacing:.06em}
.back-link--top{margin:0 0 1.4rem}
.back-link a{color:var(--muted)}
.back-link a:hover{color:var(--gold)}

/* ── 18. Tags & buttons ────────────────────────────────── */
.tag{
  display:inline-block;padding:.25em .8em;background:var(--gold-wash);
  color:var(--gold);border:1px solid var(--line-2);border-radius:999px;
  font-size:.75rem;font-family:var(--mono);letter-spacing:.04em;
}
.tag--sm{font-size:.7rem;padding:.2em .65em}
.button{
  display:inline-flex;align-items:center;gap:.5em;
  padding:.7em 1.5em;background:var(--navy);color:#fff;
  border-radius:var(--radius);font-size:.9rem;font-weight:600;letter-spacing:.02em;
  border:1px solid var(--navy);transition:background .25s var(--ease),transform .2s var(--ease);
}
.button:hover{background:var(--navy-2);color:#fff;transform:translateY(-2px)}
.button--ghost{background:transparent;color:var(--navy);border-color:var(--line-2)}
.button--ghost:hover{background:var(--paper-2);color:var(--navy);border-color:var(--navy)}

/* ── 19. Footer ────────────────────────────────────────── */
.site-footer{background:var(--navy);color:var(--on-navy-muted);margin-top:0;position:relative}
.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--gold-bright),transparent 60%)}
.site-footer__inner{
  display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:clamp(28px,4vw,56px);
  padding-block:clamp(40px,5vw,64px);
}
.site-footer__lab{font-size:1.25rem;font-weight:700;color:#fff;margin:0}
.site-footer__lab-en{font-family:var(--serif);font-style:italic;color:var(--gold-bright);margin:.2rem 0 .9rem}
.site-footer__affil{font-size:.85rem;margin:0;color:var(--on-navy-muted)}
.site-footer__title{
  font-family:var(--mono);font-size:.74rem;font-weight:600;letter-spacing:.16em;text-transform:uppercase;
  color:var(--gold-bright);margin:0 0 1.1rem;
}
.site-footer__list{list-style:none;margin:0;padding:0;display:grid;gap:.6rem;font-size:.9rem}
.site-footer__list a{color:var(--on-navy)}
.site-footer__list a:hover{color:var(--gold-bright)}
.site-footer__key{display:inline-block;width:3.2em;color:var(--on-navy-muted);font-family:var(--mono);font-size:.78rem}
.site-footer__list--nav{gap:.5rem}
.site-footer__base{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:.6rem;
  padding-block:1.4rem;border-top:1px solid rgba(255,255,255,.1);
}
.site-footer__copy,.site-footer__tagline{margin:0;font-size:.8rem;color:var(--on-navy-muted)}
.site-footer__tagline{font-family:var(--mono);letter-spacing:.05em}

/* ── 20. Error page ────────────────────────────────────── */
.error-page{text-align:center;padding-block:clamp(70px,12vw,150px)}
.error-page__code{font-family:var(--serif);font-weight:600;font-size:clamp(5rem,16vw,11rem);line-height:1;color:var(--navy);margin:.4rem 0}
.error-page__msg{font-size:1.1rem;color:var(--ink-soft);margin:0 0 2rem}

/* ── 21. Motion ── scroll-triggered reveal + micro-interactions ── */
html.no-js [data-reveal]{opacity:1!important;transform:none!important}
@media (prefers-reduced-motion:no-preference){
  [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity var(--dur-3) var(--ease),transform var(--dur-3) var(--ease);transition-delay:calc(var(--d,0) * 70ms);will-change:opacity,transform}
  [data-reveal].is-visible{opacity:1;transform:none}
  .hero [data-reveal]{transform:translateY(18px);transition-duration:.72s}
  .masthead[data-reveal],.masthead[data-reveal].is-visible{transform:none}

  .img-grid__item{overflow:hidden}
  .img-grid__item img{transition:transform var(--dur-3) var(--ease)}
  .img-grid__item:hover img{transform:scale(1.03)}
  .pi__photo{transition:box-shadow var(--dur-3) var(--ease),transform var(--dur-3) var(--ease)}
  .pi__media:hover .pi__photo{transform:translate(-2px,-2px)}
  .timeline__text::before{transition:transform var(--dur-1) var(--ease-out),box-shadow var(--dur-1) var(--ease-out)}
  .timeline__item:hover .timeline__text::before{transform:translateX(-50%) scale(1.18);box-shadow:0 0 0 2px var(--paper),0 0 0 4px var(--gold-wash),0 1px 2px rgba(6,42,69,.18)}
  .timeline__item:hover .timeline__text{color:var(--ink)}
  .alumni{transition:border-color var(--dur-1) var(--ease-out),color var(--dur-1) var(--ease-out),background var(--dur-1) var(--ease-out),transform var(--dur-1) var(--ease-out),box-shadow var(--dur-1) var(--ease-out)}
  .alumni:hover{transform:translateY(-1px)}
  .prose a,.timeline__text a,.pub__links a,.site-footer__list a{background-image:linear-gradient(var(--gold-bright),var(--gold-bright));background-size:0% 1.5px;background-repeat:no-repeat;background-position:left 92%;transition:background-size var(--dur-2) var(--ease-out),color var(--dur-1) var(--ease-out)}
  .prose a:hover,.timeline__text a:hover,.pub__links a:hover,.site-footer__list a:hover{background-size:100% 1.5px}
  .site-nav__link::after{transform-origin:right}
  .site-nav__link:hover::after,.site-nav__link.is-active::after{transform-origin:left}
}
@media (prefers-reduced-motion:reduce){
  [data-reveal]{opacity:1!important;transform:none!important;transition:none}
  .card:hover,.member-card:hover,.button:hover,.alumni:hover{transform:none}
  .pi__media:hover .pi__photo{transform:none}
  .img-grid__item:hover img{transform:none}
  .timeline__item:hover .timeline__text::before{transform:translateX(-50%)}
}

/* ── 22. Responsive ────────────────────────────────────── */
@media (max-width:900px){
  .wordmark__en{display:none}          /* 收起英文副标，避免 iPad 竖屏导航换行 */
  .pi{grid-template-columns:200px 1fr;gap:32px}
  .research{grid-template-columns:1fr;gap:32px}
  .site-footer__inner{grid-template-columns:1fr 1fr}
  .site-footer__brand{grid-column:1 / -1}
}
@media (max-width:680px){
  .masthead__bar{flex-direction:column;align-items:flex-start;gap:10px;min-height:0;padding-block:14px}
  .wordmark__en{display:none}
  .site-nav__list{gap:.2rem 1rem;margin-left:-.5em}
  .hero__domains{grid-template-columns:1fr 1fr}
  .hero__domains li{border-right:0;border-bottom:1px solid var(--line);padding:1.1rem 0}
  .hero__domains li:nth-child(odd){border-right:1px solid var(--line);padding-right:1.2rem}
  .pi{grid-template-columns:1fr;gap:0}
  .pi__media{max-width:220px;margin-bottom:2rem}
  .pi__photo{box-shadow:12px 12px 0 -1px var(--line-2)}
  .domain-grid{grid-template-columns:1fr}
  .section-en{display:none}
  .pub{grid-template-columns:1fr;gap:.6rem}
  .pub__venue{justify-self:start}
  .timeline::before{left:5.2em}
  .timeline__item{grid-template-columns:5.2em 1fr;gap:1.1em}
  .course__note{margin-left:0;flex-basis:100%}
  .site-footer__inner{grid-template-columns:1fr}
  .site-footer__base{flex-direction:column}
}

/* ============================================================
   23. LINE & DIVIDER REFINEMENT — 去掉"简笔画"硬线
   渐隐 hairline · letterpress 凹槽 · 工艺化 bullet
   ============================================================ */
.section-head{position:relative;border-bottom:0;padding-bottom:1rem}
.section-head::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:linear-gradient(90deg,var(--gold) 0,var(--gold) 2.2rem,transparent 2.2rem),var(--hair);background-repeat:no-repeat}
.section-head::before{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:linear-gradient(90deg,rgba(255,255,255,.6) 0,rgba(255,255,255,.5) 30%,transparent 80%)}
.section-head--year::after{background:linear-gradient(90deg,var(--navy) 0,var(--navy) 2.2rem,transparent 2.2rem),linear-gradient(90deg,var(--line-2) 0%,var(--line-2) 40%,rgba(211,199,175,.25) 90%,transparent 100%);background-repeat:no-repeat}

.hero,.band{border-bottom:0}
.hero{box-shadow:inset 0 -1px 0 var(--press-dark),inset 0 -2px 0 var(--press-light)}
.band{box-shadow:inset 0 -1px 0 var(--press-dark),inset 0 -2px 0 var(--press-light)}
.hero__domains{border-top:0;box-shadow:inset 0 1px 0 var(--press-light),inset 0 2px 0 var(--press-dark);padding-top:2px}
.hero__domains li{position:relative;border-right:0}
.hero__domains li:not(:last-child)::after{content:"";position:absolute;top:.4rem;bottom:.4rem;right:0;width:1px;background:var(--hair-center)}

.lined-list li{border-bottom:0;position:relative;padding:.72em 0 .72em 1.7em;background:var(--hair) bottom/100% 1px no-repeat}
.lined-list li:last-child{background:none}
.lined-list li::before{content:"\2013";position:absolute;left:.15em;top:.62em;width:auto;height:auto;border:0;transform:none;background:none;font-family:var(--serif);font-size:1.02em;font-weight:600;color:var(--gold);line-height:1;letter-spacing:.02em}
.feature__key::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--gold);transform:none;box-shadow:0 0 0 3px var(--gold-wash)}
.timeline::before{background:linear-gradient(180deg,transparent 0,var(--line-2) 12%,var(--line-2) 88%,transparent 100%)}
.timeline__text::before{width:11px;height:11px;border:0;background:var(--gold);box-shadow:0 0 0 2px var(--paper),0 0 0 3.5px var(--line-2),0 1px 2px rgba(6,42,69,.18);transform:translateX(-50%)}
.pi__facts{border-top:0;box-shadow:inset 0 1px 0 var(--press-light);background:var(--hair) top/100% 1px no-repeat}
.pi__facts li::before{content:"\2013";font-family:var(--serif);font-weight:600;letter-spacing:.06em}
.course,.pub,.grant{border-bottom:0;background:var(--hair) bottom/100% 1px no-repeat}
.course:last-child,.pub:last-child,.grant:last-child{background:none}
@media (max-width:680px){
  .hero__domains li{border-bottom:0!important}
  .hero__domains li:not(:last-child)::after{display:none}
  .hero__domains li:not(:last-child){background:var(--hair) bottom/100% 1px no-repeat}
}
@media (prefers-contrast:more){
  :root{--hair:linear-gradient(90deg,var(--line-2),var(--line-2))}
  .section-head::after{background:var(--line-2)}
}

/* ============================================================
   24. ELEVATION — 阴影是唯一的深度语言（覆盖前面扁平规则）
   ============================================================ */
.card{box-shadow:var(--shadow-xs);transition:border-color var(--dur-2) var(--ease),transform var(--dur-2) var(--ease),box-shadow var(--dur-2) var(--ease)}
.card:hover{transform:translateY(-3px);border-color:var(--line-2);box-shadow:var(--shadow-md)}
.card__more{box-shadow:inset 0 1px 0 rgba(255,255,255,.45)}
.domain-grid,.feature-grid,.meta-list{box-shadow:var(--shadow-xs)}
.recruit{box-shadow:0 2px 6px var(--sh-warm-2),0 14px 30px -8px var(--sh-navy-4),0 28px 56px -16px rgba(6,42,69,.22)}
.member-card{box-shadow:var(--shadow-xs);transition:border-color var(--dur-2) var(--ease),transform var(--dur-2) var(--ease),box-shadow var(--dur-2) var(--ease)}
.member-card:hover{transform:translateY(-2px);border-color:var(--line-2);box-shadow:var(--shadow-sm)}
.member-card__photo{box-shadow:var(--hl-top-soft),0 2px 6px -1px var(--sh-navy-2)}
.pi__photo{box-shadow:var(--hl-top-soft),0 6px 16px -6px var(--sh-navy-3),18px 18px 0 -2px var(--paper-3),18px 18px 0 -1px var(--line-2)}
.img-grid__item img{box-shadow:var(--shadow-sm)}
.pub__venue,.prose__label{box-shadow:inset 0 1px 0 rgba(255,255,255,.5),0 1px 1.5px var(--sh-warm)}
.tag{box-shadow:inset 0 1px 0 rgba(255,255,255,.45),0 1px 1.5px var(--sh-warm)}
.button{box-shadow:var(--hl-top),0 1px 2px var(--sh-warm-2),0 3px 8px -2px rgba(6,42,69,.28);transition:background var(--dur-1) var(--ease-out),transform var(--dur-1) var(--ease-out),box-shadow var(--dur-2) var(--ease-out)}
.button:hover{transform:translateY(-2px);box-shadow:var(--hl-top),0 2px 4px var(--sh-warm-2),0 8px 18px -4px rgba(6,42,69,.34)}
.button:active{transform:translateY(0);box-shadow:var(--shadow-press)}
.button--ghost{box-shadow:none}
.button--ghost:hover{box-shadow:var(--shadow-xs)}
.masthead{transition:box-shadow var(--dur-2) var(--ease),background var(--dur-2) var(--ease)}
body.is-scrolled .masthead{border-bottom-color:transparent;box-shadow:var(--shadow-sticky)}
.site-footer{box-shadow:inset 0 1px 0 rgba(255,255,255,.06),inset 0 14px 28px -18px rgba(0,0,0,.5)}
.site-footer::before{height:2px}
@media (max-width:680px){.pi__photo{box-shadow:var(--hl-top-soft),0 5px 14px -6px var(--sh-navy-3),12px 12px 0 -1px var(--line-2)}}

/* ============================================================
   25. SEAL — 天津大学校徽嵌入（masthead 小徽 + footer 小徽 + 水印）
   ============================================================ */
.wordmark__seal{width:30px;height:30px;flex:none;object-fit:contain;filter:drop-shadow(0 1px 0 rgba(255,255,255,.6)) drop-shadow(0 1px 2px rgba(6,42,69,.18));transition:transform var(--dur-2) var(--ease),filter var(--dur-2) var(--ease)}
.wordmark:hover .wordmark__seal{transform:rotate(-4deg) scale(1.04);filter:drop-shadow(0 1px 0 rgba(255,255,255,.7)) drop-shadow(0 2px 5px rgba(6,42,69,.28))}
.wordmark__seal+.wordmark__text{position:relative;padding-left:.95rem;margin-left:.1rem}
.wordmark__seal+.wordmark__text::before{content:"";position:absolute;left:0;top:.1em;bottom:.1em;width:1px;background:linear-gradient(180deg,transparent,var(--line-2) 22%,var(--line-2) 78%,transparent);box-shadow:1px 0 0 rgba(255,255,255,.55)}
.site-footer__brand{position:relative}
.site-footer__brand::before{content:"";position:absolute;z-index:0;pointer-events:none;left:-18px;top:-22px;width:clamp(200px,16vw,260px);aspect-ratio:504/462;background:url('/assets/img/tju-seal.png') no-repeat center/contain;filter:brightness(0) invert(1);opacity:.05;mask-image:radial-gradient(circle,#000 60%,transparent 85%);-webkit-mask-image:radial-gradient(circle,#000 60%,transparent 85%)}
.site-footer__brand>*{position:relative;z-index:1}
.site-footer__seal{width:34px;height:34px;object-fit:contain;filter:brightness(0) invert(1) drop-shadow(0 1px 3px rgba(0,0,0,.35));opacity:.92;margin-bottom:1rem}
@media (max-width:680px){.site-footer__brand::before{display:none}.wordmark__seal{width:26px;height:26px}}

/* ============================================================
   26. ATMOSPHERIC IMAGERY (P1) — 缺图时回退当前观感，放图即自动生效
   ============================================================ */
body::after{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background-image:url('/assets/img/paper-grain.webp');background-size:256px 256px;mix-blend-mode:multiply;opacity:.05}
.hero{background-color:var(--paper);background-image:linear-gradient(180deg,rgba(251,248,241,.30) 0%,rgba(251,248,241,.55) 45%,var(--paper) 88%),url('/assets/img/hero-timeflow.webp');background-repeat:no-repeat,no-repeat;background-position:center top,right -6% top -10%;background-size:cover,78% auto}
.hero::before{z-index:0}
.hero__inner{position:relative;z-index:2}
.band--pi{position:relative;overflow:hidden}
.band--pi::before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;background:url('/assets/img/caisson-watermark.webp') right center/46% auto no-repeat;opacity:.16;mask-image:linear-gradient(90deg,transparent 0%,#000 72%);-webkit-mask-image:linear-gradient(90deg,transparent 0%,#000 72%)}
.band--pi>.wrap{position:relative;z-index:1}
.recruit{isolation:isolate}
.recruit__bg{position:absolute;inset:0;z-index:0;pointer-events:none;background:url('/assets/img/recruit-mineral.webp') center/cover no-repeat;mix-blend-mode:screen;opacity:.22;mask-image:linear-gradient(120deg,#000 30%,transparent 92%);-webkit-mask-image:linear-gradient(120deg,#000 30%,transparent 92%)}
.recruit__lead,.recruit .bullet-list{position:relative;z-index:1}
@media (prefers-contrast:more){.hero{background-image:none}.recruit__bg,.band--pi::before,body::after{display:none}}

/* ============================================================
   27. HERO — image-backed dark band（image_1 为深蓝氛围图，hero 翻为深色+亮字）
   左重渐变 scrim 保证左侧标题可读，右上放出数据流光晕
   ============================================================ */
.hero{
  background-color:var(--navy);
  background-image:
    linear-gradient(105deg, rgba(4,25,42,.95) 0%, rgba(4,25,42,.82) 34%, rgba(5,34,56,.50) 62%, rgba(6,42,69,.60) 100%),
    url('/assets/img/hero-timeflow.webp');
  background-repeat:no-repeat,no-repeat;
  background-position:center,center right;
  background-size:cover,cover;
  border-bottom:0;
  box-shadow:inset 0 -1px 0 rgba(255,255,255,.07);
}
.hero::before{display:none}
.hero::after{top:-25%;right:-8%;width:62%;height:130%;background:radial-gradient(closest-side,rgba(242,168,29,.20),transparent 72%)}
.hero__inner{position:relative;z-index:2}
.hero .eyebrow--hero{color:var(--gold-bright)}
.hero .eyebrow--hero::before{background:var(--gold-bright)}
.hero__title{color:#fff}
.hero__title-en{color:var(--gold-bright)}
.hero__lead{color:rgba(238,243,248,.90)}
.hero__lead em{color:#fff}
.hero__lead strong{color:#fff}
.hero__domains{box-shadow:inset 0 1px 0 rgba(255,255,255,.16)}
.hero__domain-idx{color:var(--gold-bright)}
.hero__domain-zh{color:#fff}
.hero__domain-en{color:rgba(238,243,248,.58)}
.hero__domains li:not(:last-child)::after{background:linear-gradient(180deg,transparent,rgba(255,255,255,.20) 45%,rgba(255,255,255,.20) 55%,transparent)}
@media (prefers-contrast:more){.hero{background-image:none;background-color:var(--navy)}}