/* 南京大学区块链研究门户 · 站点样式（自托管，无外部依赖） */
:root{
  --bg:#FAFBFD;
  --bg-2:#F1F4F9;
  --line:#DCE2EC;
  --ink:#1B2230;
  --ink-2:#55606F;
  --ink-3:#86909E;
  --accent:#0A5BD8;        /* 取自实验室 logo 的蓝 */
  --accent-2:#0847B0;
  --accent-soft:#E3EEFF;
  --navy:#1F3B7A;
  --dyn:#1E7A5A;           /* 「全校」层级用绿 */
  --dyn-soft:#DDF3EA;
  --prod:#8A5A1E;
  --prod-soft:#F5EBDC;
  --serif:"Songti SC","Noto Serif CJK SC","Source Han Serif SC","SimSun","Times New Roman",serif;
  --sans:"PingFang SC","Hiragino Sans GB","Noto Sans CJK SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --wrap:1120px;
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.75}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
a:focus-visible,button:focus-visible,label:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
h1,h2,h3,h4{font-family:var(--serif);line-height:1.3;margin:0;text-wrap:balance;font-weight:700}
h1{font-size:2rem}
h2{font-size:1.5rem}
h3{font-size:1.15rem}
p{margin:0 0 1em}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:#fff;padding:8px 12px;z-index:100}
.skip:focus{left:12px;top:12px}
.eyebrow{font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);font-weight:600}
.muted{color:var(--ink-3)}
.small{font-size:.86rem}

/* header */
.site-header{background:var(--bg);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.site-header .wrap{display:flex;align-items:center;gap:24px;min-height:72px}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;flex-shrink:0}
.brand:hover{text-decoration:none}
.brand-logo{width:40px;height:40px;flex-shrink:0;object-fit:contain}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-cn{font-family:var(--serif);font-weight:700;font-size:1.05rem}
.brand-en{font-size:.68rem;letter-spacing:.06em;color:var(--ink-3);text-transform:uppercase}
.nav{display:flex;gap:4px;margin-left:auto}
.nav a{color:var(--ink-2);padding:8px 10px;border-radius:4px;font-size:.93rem;text-decoration:none;white-space:nowrap}
.nav a:hover{background:var(--bg-2);color:var(--ink)}
.nav a.active{color:var(--accent);font-weight:600;box-shadow:inset 0 -2px 0 var(--accent);border-radius:0}
.nav .nav-sep{width:1px;height:20px;background:var(--line);margin:0 6px;align-self:center}
.nav a.ext{color:var(--dyn);font-weight:500;background:var(--dyn-soft)}
.nav a.ext:hover{background:var(--dyn);color:#fff}
.nav a.ext + a.ext{margin-left:2px}
.nav-toggle{display:none}
.nav-burger{display:none;margin-left:auto;width:40px;height:40px;position:relative;cursor:pointer;border-radius:4px}
.nav-burger span,.nav-burger span::before,.nav-burger span::after{content:"";position:absolute;left:9px;width:22px;height:2px;background:var(--ink);transition:transform .2s}
.nav-burger span{top:19px}
.nav-burger span::before{left:0;top:-7px}
.nav-burger span::after{left:0;top:7px}
@media (max-width:860px){
  .site-header .wrap{flex-wrap:wrap;gap:0}
  .nav-burger{display:block}
  .nav{display:none;flex-basis:100%;flex-direction:column;padding:8px 0 12px;border-top:1px solid var(--line);margin:0}
  .nav-toggle:checked ~ .nav{display:flex}
  .nav a.active{box-shadow:inset 3px 0 0 var(--accent);border-radius:0}
  .nav .nav-sep{width:auto;height:1px;margin:6px 0}
  .nav a.ext{margin:2px 0}
  .brand-en{display:none}
}

/* page head */
.page-head{background:var(--bg-2);border-bottom:1px solid var(--line);padding:40px 0 0}
.page-head h1{margin-top:6px}
.page-head .lede{color:var(--ink-2);max-width:62ch;font-size:1.05rem;margin:10px 0 0}
.page-head .wrap{padding-bottom:28px}
.subnav{display:flex;gap:2px;flex-wrap:wrap;margin-top:22px;margin-bottom:-28px;border-top:1px solid var(--line);padding-top:4px}
.subnav a{padding:10px 14px;color:var(--ink-2);font-size:.92rem;text-decoration:none;border-bottom:2px solid transparent}
.subnav a:hover{color:var(--ink)}
.subnav a.active{color:var(--accent);border-color:var(--accent);font-weight:600}
main{padding-bottom:80px}
main > .wrap{padding-top:36px}

/* prose */
.prose{max-width:72ch}
.prose h2{margin:2em 0 .6em;padding-top:.2em}
.prose h3{margin:1.6em 0 .5em}
.prose ul,.prose ol{padding-left:1.4em}
.prose li{margin:.3em 0}
.prose blockquote{margin:1.2em 0;padding:.6em 1.2em;border-left:3px solid var(--accent);background:var(--accent-soft);color:var(--ink-2)}
.prose img{border-radius:6px;margin:1.2em 0}
.prose table{border-collapse:collapse;width:100%;font-size:.93rem;margin:1em 0}
.prose th,.prose td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:top}
.prose th{color:var(--ink-2);font-weight:500;font-size:.85rem}
.prose td:first-child{white-space:nowrap}
.prose code{font-family:var(--mono);font-size:.86em;background:var(--bg-2);padding:1px 5px;border-radius:3px}
.prose pre{background:var(--bg-2);border:1px solid var(--line);border-radius:6px;padding:12px 14px;overflow-x:auto;font-size:.85rem}
.prose pre code{background:none;padding:0}
.meta-line{color:var(--ink-3);font-size:.9rem;margin-bottom:18px}
.cover{border-radius:6px;margin-bottom:24px}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px;margin-top:24px}
.gallery img{border-radius:4px;aspect-ratio:4/3;object-fit:cover}
.notice{border-left:3px solid var(--accent);background:var(--accent-soft);padding:12px 16px;border-radius:0 6px 6px 0;margin:0 0 24px;max-width:72ch;font-size:.95rem}
.notice p:last-child{margin:0}

/* home */
.hero{padding:64px 0 56px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,var(--bg-2),var(--bg))}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:48px;align-items:center}
.hero h1{font-size:2.5rem;margin:10px 0 14px}
.hero .lede{font-size:1.1rem;color:var(--ink-2);max-width:48ch}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.btn{display:inline-block;padding:10px 18px;border-radius:4px;font-size:.95rem;text-decoration:none;border:1px solid var(--accent);color:var(--accent);font-weight:500}
.btn:hover{background:var(--accent-soft);text-decoration:none}
.btn.primary{background:var(--accent);color:#fff}
.btn.primary:hover{background:var(--accent-2)}
.hero-facts{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.fact{border:1px solid var(--line);border-radius:6px;padding:14px 16px;background:var(--bg)}
.fact .num{font-family:var(--serif);font-size:1.9rem;font-weight:700;line-height:1.1;font-variant-numeric:tabular-nums;color:var(--accent)}
.fact .lbl{font-size:.82rem;color:var(--ink-2);margin-top:4px}
@media (max-width:860px){.hero .wrap{grid-template-columns:1fr}.hero h1{font-size:2rem}}
.section{padding:48px 0 0}
.section-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:18px}
.section-head .more{font-size:.9rem;white-space:nowrap}
.entries{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.entry{border:1px solid var(--line);border-radius:6px;padding:20px 22px;background:var(--bg);display:flex;flex-direction:column;gap:8px;color:var(--ink);text-decoration:none;position:relative}
.entry:hover{text-decoration:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.entry .tag{align-self:flex-start}
.entry h3{margin:0}
.entry p{margin:0;color:var(--ink-2);font-size:.93rem}
.entry .go{margin-top:auto;padding-top:8px;font-size:.88rem;color:var(--accent);font-weight:500}
@media (max-width:860px){.entries{grid-template-columns:1fr}}
.tag{display:inline-block;font-size:.74rem;padding:1px 8px;border-radius:3px;font-weight:500;letter-spacing:.02em;white-space:nowrap;background:var(--bg-2);color:var(--ink-2);border:1px solid var(--line)}
.tag.static{background:var(--accent-soft);color:var(--accent);border-color:transparent}
.tag.dyn{background:var(--dyn-soft);color:var(--dyn);border-color:transparent}
.tag.prod{background:var(--prod-soft);color:var(--prod);border-color:transparent}
.two-col{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:40px}
@media (max-width:860px){.two-col{grid-template-columns:1fr}}
.post-list{list-style:none;margin:0;padding:0}
.post-list li{display:grid;grid-template-columns:110px 1fr;gap:16px;padding:14px 0;border-bottom:1px solid var(--line)}
.post-list time{color:var(--ink-3);font-variant-numeric:tabular-nums;font-size:.9rem;padding-top:2px}
.post-list a{font-weight:500;color:var(--ink)}
.post-list a:hover{color:var(--accent)}
.post-list p{margin:4px 0 0;color:var(--ink-2);font-size:.9rem}
@media (max-width:600px){.post-list li{grid-template-columns:1fr;gap:2px}}
.pub-compact{list-style:none;margin:0;padding:0}
.pub-compact li{padding:10px 0;border-bottom:1px solid var(--line);font-size:.93rem}
.pub-compact .yr{color:var(--ink-3);font-variant-numeric:tabular-nums;margin-right:8px}

/* members */
.member-group{margin-bottom:44px}
.member-group h2{margin-bottom:16px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.members{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:18px}
.member{display:flex;flex-direction:column;gap:8px}
.member .photo{aspect-ratio:1/1;border-radius:6px;background:var(--bg-2);overflow:hidden;border:1px solid var(--line)}
.member .photo img{width:100%;height:100%;object-fit:cover}
.member .photo.empty{display:flex;align-items:center;justify-content:center;color:var(--ink-3);font-family:var(--serif);font-size:2rem}
.member .name{font-weight:600;font-size:1.02rem}
.member .name a{color:var(--ink)}
.member .title{font-size:.86rem;color:var(--ink-2);line-height:1.5}
.member .unit{font-size:.8rem;color:var(--ink-3)}
.alumni-table td:first-child{white-space:nowrap}

/* publications */
.filters{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 20px;align-items:center}
.filters label{font-size:.9rem;color:var(--ink-2)}
.filters select,.filters input[type=search]{font:inherit;font-size:.92rem;padding:6px 10px;border:1px solid var(--line);border-radius:4px;background:var(--bg);color:var(--ink)}
.filters input[type=search]{min-width:240px;flex:1}
.filters .count{margin-left:auto;font-size:.86rem;color:var(--ink-3);font-variant-numeric:tabular-nums}
.pub-year{margin:28px 0 10px;font-family:var(--serif);font-size:1.2rem;color:var(--accent)}
.pub-list{list-style:none;margin:0;padding:0}
.pub-list li{padding:10px 0 10px 0;border-bottom:1px solid var(--line);font-size:.95rem;display:grid;grid-template-columns:1fr auto;gap:12px;align-items:start}
.pub-list li .links{white-space:nowrap;font-size:.85rem}
.pub-list li[hidden]{display:none}
.pub-year[hidden]{display:none}
/* 年份分组行：与条目同处一个 <ul> 供 List.js 索引，但不套用条目的网格与分隔线 */
.pub-list li.pub-year-row{display:block;padding:0;border-bottom:none}
.pub-list li.pub-year-row .pub-year{margin:28px 0 10px}
.data-table{width:100%;border-collapse:collapse;font-size:.93rem}
.data-table th,.data-table td{text-align:left;padding:10px 10px;border-bottom:1px solid var(--line);vertical-align:top}
.data-table th{font-weight:500;color:var(--ink-2);font-size:.83rem;letter-spacing:.03em;border-bottom:2px solid var(--line)}
.data-table tr[hidden]{display:none}
.tbl{overflow-x:auto}
.empty{border:1px dashed var(--line);border-radius:6px;padding:28px;text-align:center;color:var(--ink-3);max-width:72ch}

/* directions / cards */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:16px}
.card{border:1px solid var(--line);border-radius:6px;overflow:hidden;background:var(--bg);display:flex;flex-direction:column}
.card .img{aspect-ratio:3/2;background:var(--bg-2);overflow:hidden}
.card .img img{width:100%;height:100%;object-fit:cover}
/* 无封面照片的活动卡片：不留空图框，改用一条顶部色条 */
.card.no-img{border-top:3px solid var(--accent-soft)}
.card.no-img .body{padding-top:16px}
.card .body{padding:14px 16px 16px}
.card h3{margin-bottom:6px}
.card p{margin:0;font-size:.9rem;color:var(--ink-2)}
.team{border:1px solid var(--line);border-radius:6px;padding:18px 20px;display:flex;flex-direction:column;gap:6px}
.team .u{font-size:.84rem;color:var(--ink-3)}
.team .dirs{display:flex;gap:6px;flex-wrap:wrap;margin-top:4px}

/* platforms */
.platform{border:1px solid var(--line);border-radius:6px;padding:26px 28px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:start;margin-bottom:16px}
.platform h2{margin:6px 0 8px}
.platform p{color:var(--ink-2);margin:0 0 .6em}
.platform .cta{white-space:nowrap}
@media (max-width:640px){.platform{grid-template-columns:1fr}}

/* footer */
.site-footer{border-top:1px solid var(--line);background:var(--bg-2);padding:40px 0 24px;font-size:.9rem;color:var(--ink-2)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:32px}
.footer-title{font-weight:600;color:var(--ink);margin-bottom:8px}
.footer-links{list-style:none;margin:0;padding:0}
.footer-links li{margin:3px 0}
.footer-meta{display:flex;gap:24px;flex-wrap:wrap;margin-top:28px;padding-top:16px;border-top:1px solid var(--line);font-size:.82rem;color:var(--ink-3)}
@media (max-width:860px){.footer-grid{grid-template-columns:1fr}}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* scholars */
.scholars{display:flex;flex-direction:column;gap:8px}
.scholar{border:1px solid var(--line);border-radius:6px;background:var(--bg)}
.scholar[hidden]{display:none}
.scholar summary{list-style:none;cursor:pointer;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1.4fr) auto;gap:16px;align-items:center;padding:12px 16px}
.scholar summary::-webkit-details-marker{display:none}
.scholar summary:hover{background:var(--bg-2)}
.scholar[open] summary{border-bottom:1px solid var(--line);background:var(--bg-2)}
.s-name{font-weight:600}
.s-unit{color:var(--ink-2);font-size:.9rem}
.s-count{font-variant-numeric:tabular-nums;color:var(--ink-2);font-size:.9rem;white-space:nowrap}
.s-flags{display:flex;gap:4px}
.s-body{padding:12px 16px 16px}
@media (max-width:700px){.scholar summary{grid-template-columns:1fr auto;row-gap:4px}.s-unit{grid-column:1 / -1}}

/* platform band */
.platform-band{padding:28px 0 8px}
.band-head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:12px}
.band{display:grid;grid-template-columns:1.3fr 1fr;gap:14px}
.pcard{display:flex;flex-direction:column;gap:8px;padding:22px 24px;border-radius:8px;background:var(--accent);color:#fff;text-decoration:none;position:relative;overflow:hidden}
.pcard::after{content:"";position:absolute;right:-40px;top:-40px;width:160px;height:160px;border-radius:50%;background:rgba(255,255,255,.08)}
.pcard:hover{text-decoration:none;background:var(--accent-2)}
.pcard.alt{background:var(--navy)}
.pcard.alt:hover{background:#2A4C99}
.pcard-domain{font-family:var(--serif);font-size:1.5rem;font-weight:700;letter-spacing:.01em}
.pcard-desc{font-size:.92rem;opacity:.92;max-width:52ch;line-height:1.6}
.pcard-go{margin-top:auto;padding-top:6px;font-size:.9rem;font-weight:600;opacity:.95}
@media (max-width:860px){.band{grid-template-columns:1fr}}
.s-home{font-size:.8rem;font-weight:500;margin-left:6px;padding:1px 7px;border:1px solid var(--accent);border-radius:3px;color:var(--accent);white-space:nowrap}
.s-home:hover{background:var(--accent);color:#fff;text-decoration:none}

/* highlights / storylines / cooperation */
.highlights{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px 28px;counter-reset:h}
.highlights li{counter-increment:h;padding:18px 0 0;border-top:2px solid var(--accent)}
.highlights li::before{content:counter(h,decimal-leading-zero);font-family:var(--serif);color:var(--accent);font-size:.9rem;letter-spacing:.06em}
.highlights h3{margin:4px 0 6px}
.highlights p{color:var(--ink-2);font-size:.93rem;margin-bottom:6px}
.highlights a{font-size:.9rem;font-weight:500}
.entry .q{color:var(--ink);font-size:.95rem}
.plain-list{list-style:none;margin:0;padding:0}
.plain-list li{padding:8px 0;border-bottom:1px solid var(--line)}
.plain-list.small li{padding:5px 0}
.sec-title{margin:44px 0 14px;padding-bottom:8px;border-bottom:1px solid var(--line)}
.storyline{border:1px solid var(--line);border-radius:6px;padding:22px 26px;margin-bottom:18px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);gap:28px;scroll-margin-top:90px}
.story-head h3{font-size:1.3rem;margin-bottom:8px}
.story-head .q{color:var(--accent);font-weight:500}
.story-head p{font-size:.95rem;color:var(--ink-2)}
.timeline{list-style:none;margin:0;padding:0;border-left:2px solid var(--accent-soft)}
.timeline li{display:grid;grid-template-columns:52px 1fr;gap:10px;padding:0 0 12px 14px;font-size:.92rem;position:relative}
.timeline li::before{content:"";position:absolute;left:-6px;top:8px;width:10px;height:10px;border-radius:50%;background:var(--accent)}
.t-year{color:var(--ink-3);font-variant-numeric:tabular-nums}
.story-out{grid-column:1 / -1;margin:0;padding-top:12px;border-top:1px dashed var(--line);font-size:.92rem;color:var(--ink-2)}
@media (max-width:860px){.storyline{grid-template-columns:1fr}}
.contact-card{border:1px solid var(--line);border-radius:6px;padding:22px 24px;background:var(--bg-2);align-self:start}
.club-logo{display:block;width:200px;max-width:100%;height:auto;margin:0 0 16px}
.contact-card p{margin-bottom:.6em}

/* v2: overview, directions, charts */
.overview{list-style:none;margin:0;padding:0;border-left:2px solid var(--accent);display:flex;flex-direction:column;gap:10px;padding-left:18px;font-size:.95rem;color:var(--ink-2)}
.entry-points{margin:0;padding-left:1.1em;font-size:.9rem;color:var(--ink-2)}
.entry-points li{margin:3px 0}
.direction{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:36px;padding:32px 0;border-bottom:1px solid var(--line);scroll-margin-top:90px}
.direction:first-of-type{padding-top:8px}
.dir-head h2{font-size:1.45rem;margin-bottom:8px}
.dir-head .q{color:var(--ink-2)}
.dir-points{margin:12px 0 0;padding-left:1.1em;font-size:.93rem}
.dir-points li{margin:4px 0}
.dir-body h3{font-size:.8rem;letter-spacing:.08em;color:var(--ink-3);font-family:var(--sans);font-weight:600;margin:14px 0 6px}
.dir-body h3:first-child{margin-top:0}
.dir-body p{font-size:.93rem;margin:0}
.dir-list{margin:0;padding-left:1.1em;font-size:.93rem}
.dir-list li{margin:3px 0}
@media (max-width:860px){.direction{grid-template-columns:1fr;gap:16px}}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin-bottom:24px}
.stat{border:1px solid var(--line);border-radius:6px;padding:12px 16px}
.stat .v{font-size:1.6rem;font-weight:600;line-height:1.2}
.stat .l{font-size:.82rem;color:var(--ink-2)}
@media (max-width:640px){.stats{grid-template-columns:repeat(2,1fr)}}
.charts{display:grid;grid-template-columns:1fr;gap:24px;margin-bottom:28px;max-width:720px}
@media (max-width:860px){.charts{grid-template-columns:1fr}}
.chart{margin:0;border:1px solid var(--line);border-radius:6px;padding:14px 16px 10px}
.chart figcaption{font-size:.85rem;color:var(--ink-2);margin:0 0 8px;font-weight:500}
.chart svg{width:100%;height:auto;display:block}
.chart .grid{stroke:var(--line);stroke-width:1}
.chart .bar rect{fill:var(--accent)}
.chart .bar:hover rect{fill:var(--accent-2)}
.chart .val{font-size:11px;fill:var(--ink-2)}
.chart .tick{font-size:11px;fill:var(--ink-3)}
.hbars{display:flex;flex-direction:column;gap:6px}
.hrow{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr) 28px;gap:10px;align-items:center;font-size:.82rem;cursor:pointer}
.hrow:hover .hfill{background:var(--accent-2)}
.hk{color:var(--ink-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.htrack{height:10px;background:var(--bg-2);border-radius:2px;overflow:hidden}
.hfill{display:block;height:100%;background:var(--accent);border-radius:0 2px 2px 0}
.hv{text-align:right;color:var(--ink-2);font-variant-numeric:tabular-nums}

/* v3: two-layer scope */
.scope{display:inline-block;font-family:var(--sans);font-size:.72rem;font-weight:600;letter-spacing:.06em;padding:2px 8px;border-radius:3px;vertical-align:middle;margin-right:10px;position:relative;top:-3px}
.scope.scope-nju{background:var(--dyn-soft);color:var(--dyn)}
.scope.scope-lab{background:var(--accent-soft);color:var(--accent)}
.eyebrow{display:inline-block}
.eyebrow.scope-nju{color:var(--dyn)}
.eyebrow.scope-lab{color:var(--accent)}
.hero-split{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.split{display:flex;flex-direction:column;gap:4px;padding:18px 20px;border-radius:6px;border:1px solid var(--line);text-decoration:none;color:var(--ink);background:var(--bg)}
.split:hover{text-decoration:none;box-shadow:0 0 0 3px var(--accent-soft)}
.split-k{font-size:.72rem;font-weight:600;letter-spacing:.08em}
.split.nju .split-k{color:var(--dyn)}
.split.lab .split-k{color:var(--accent)}
.split.nju{border-top:3px solid var(--dyn)}
.split.lab{border-top:3px solid var(--accent)}
.split-t{font-family:var(--serif);font-weight:700;font-size:1.15rem}
.split-d{font-size:.85rem;color:var(--ink-2)}
@media (max-width:640px){.hero-split{grid-template-columns:1fr}}
.course-list{display:flex;flex-direction:column;gap:10px}
.course{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:20px;padding:16px 18px;border:1px solid var(--line);border-radius:6px}
.course h3{margin-bottom:4px}
.course p{margin:0;font-size:.93rem;color:var(--ink-2)}
.course-meta{display:flex;flex-direction:column;gap:2px;font-size:.85rem;color:var(--ink-2);text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
@media (max-width:640px){.course{grid-template-columns:1fr}.course-meta{flex-direction:row;gap:12px;text-align:left}}

/* platform modules */
.platform-full{border:1px solid var(--line);border-radius:6px;padding:26px 28px;margin-bottom:18px}
.pf-head{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:start;margin-bottom:16px}
.pf-head h2{margin-bottom:4px}
.pf-head .q{color:var(--accent);font-weight:500;margin-bottom:6px}
.pf-head p{color:var(--ink-2);margin:0 0 .4em;max-width:70ch}
.modules{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px}
.module{display:flex;flex-direction:column;gap:4px;padding:12px 14px;border:1px solid var(--line);border-radius:4px;background:var(--bg-2);color:var(--ink);text-decoration:none}
.module:hover{text-decoration:none;border-color:var(--accent);background:var(--bg)}
.m-name{font-weight:600;font-size:.95rem}
.m-text{font-size:.84rem;color:var(--ink-2)}
@media (max-width:640px){.pf-head{grid-template-columns:1fr}}
.pcard-mods{display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}
.pcard-mods span{font-size:.78rem;padding:2px 8px;border-radius:3px;background:rgba(255,255,255,.16)}

/* lab logo on lab page */
.lab-intro{display:grid;grid-template-columns:minmax(0,1fr) 200px;gap:40px;align-items:start}
.lab-logo{width:200px;height:200px;object-fit:contain;justify-self:end}
.lab-logo-caption{font-size:.8rem;color:var(--ink-3);text-align:center;margin-top:6px}
@media (max-width:860px){.lab-intro{grid-template-columns:1fr}.lab-logo{justify-self:start;width:140px;height:140px}}
.roster{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px 18px}
.roster li{font-size:1rem}
.roster a{color:var(--ink);font-weight:500}
.roster a:hover{color:var(--accent)}

/* 语言切换：与其他导航项同样式的纯文字链接，只在悬停时区分 */
.nav a.lang:hover{color:var(--accent);background:var(--accent-soft)}
.nav-sep{width:1px;align-self:center;height:18px;background:var(--line);margin:0 6px}