:root{
  --ink:#141414; --text:#3b4049; --muted:#797f82; --faint:#b3b8c0; --line:#e4e4e4;
  --bg:#ffffff; --soft:#f6f6f5; --dark:#333333; --radius:20px;
  --heading:"Poppins",system-ui,sans-serif; --body:"Inter",system-ui,sans-serif;
  --wrap:1240px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--body);font-size:16px;line-height:1.65;letter-spacing:-.01em;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
p a,li a,.link{text-decoration:underline;text-decoration-color:var(--faint);text-underline-offset:3px;transition:text-decoration-color .2s}
p a:hover,li a:hover,.link:hover{text-decoration-color:var(--text)}
h1,h2,h3,h4{font-family:var(--heading);color:var(--text);font-weight:500;letter-spacing:-.02em;margin:0}
.skip{position:absolute;left:-999px;top:8px;background:var(--dark);color:#fff;padding:8px 14px;border-radius:10px;z-index:100}
.skip:focus{left:16px}
:focus-visible{outline:2px solid var(--text);outline-offset:3px;border-radius:4px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:saturate(180%) blur(12px);-webkit-backdrop-filter:saturate(180%) blur(12px)}
.bar{max-width:var(--wrap);margin:0 auto;padding:0 40px;height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{font-family:var(--heading);font-size:22px;font-weight:500;color:var(--text);letter-spacing:-.02em;white-space:nowrap}
.nav{display:flex;align-items:center;gap:4px}
.nav>a,.nav .dd>button{font-family:var(--heading);font-size:13px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:8px 11px;border-radius:10px;background:none;border:0;cursor:pointer;transition:color .2s}
.nav>a:hover,.nav .dd>button:hover,.nav a[aria-current=page],.nav .dd.on>button{color:var(--text)}
.dd{position:relative}
.dd-menu{position:absolute;top:calc(100% + 6px);left:0;min-width:200px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:8px;box-shadow:0 12px 30px rgba(0,0,0,.06);opacity:0;visibility:hidden;transform:translateY(-4px);transition:.18s}
.dd:hover .dd-menu,.dd:focus-within .dd-menu{opacity:1;visibility:visible;transform:none}
.dd-menu a{display:block;padding:8px 12px;border-radius:8px;font-size:14px;color:var(--text)}
.dd-menu a:hover,.dd-menu a[aria-current=page]{background:var(--soft)}
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--heading);font-size:14px;font-weight:500;background:var(--dark);color:#fff;border-radius:12px;padding:10px 18px;border:0;cursor:pointer;transition:background .2s,transform .2s;text-decoration:none}
.btn:hover{background:#111;transform:translateY(-1px)}
.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--line)}
.btn.ghost:hover{border-color:var(--text);background:transparent}
.menu-btn{display:none;width:42px;height:42px;border-radius:12px;background:var(--dark);border:0;color:#fff;cursor:pointer;align-items:center;justify-content:center}
.menu-btn span{display:block;width:16px;height:1.5px;background:#fff;position:relative}
.menu-btn span::before,.menu-btn span::after{content:"";position:absolute;left:0;width:16px;height:1.5px;background:#fff}
.menu-btn span::before{top:-5px}.menu-btn span::after{top:5px;width:10px;left:6px}
.mobile-nav{display:none}

/* layout */
main{display:block}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 40px}
.split{display:grid;grid-template-columns:400px 1fr;gap:0;max-width:var(--wrap);margin:0 auto;padding:0 40px}
.profile{position:sticky;top:76px;align-self:start;padding:56px 48px 56px 0;border-right:1px solid var(--line);min-height:calc(100vh - 76px)}
.profile img{width:217px;height:217px;object-fit:cover}
.profile h1{font-size:24px;line-height:1.6;margin-top:28px}
.profile .role{color:var(--muted);font-size:14px;margin:6px 0 0}
.profile .role.seed{color:var(--faint);font-size:13px}
.profile .tag{color:var(--ink);font-size:15px;line-height:1.55;margin:22px 0 0;font-weight:450}
.profile .actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:26px}
.profile .actions a.mail{font-size:14px;color:var(--muted)}
.profile .jump{list-style:none;padding:0;margin:30px 0 0}
.profile .jump li{margin:6px 0}
.profile .jump a{font-family:var(--heading);font-size:14px;color:var(--text);text-decoration:none;opacity:.85}
.profile .jump a:hover{opacity:1}
.content{padding:56px 0 40px 56px;min-width:0}

.page-head{padding:72px 0 40px}
.eyebrow{font-family:var(--heading);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:0 0 14px}
.page-head h1{font-size:44px;line-height:1.15;max-width:820px}
.page-head .lede{font-size:18px;color:var(--muted);max-width:720px;margin:20px 0 0;line-height:1.6}

.row{display:grid;grid-template-columns:minmax(180px,1fr) 2.2fr;gap:40px;padding:44px 0;border-top:1px solid var(--line)}
.row:first-child{border-top:0}
.row>h2{font-size:22px;line-height:1.3;align-self:start;position:sticky;top:100px}
.row .body{min-width:0}
.body p{margin:0 0 16px}
.body p:last-child{margin-bottom:0}
.intro h2{font-size:20px;margin-bottom:20px}
.intro p{font-size:17px;line-height:1.75}
.small{font-size:14px;color:var(--muted)}

/* concept cards */
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.card{border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:border-color .2s,transform .25s;background:#fff;display:flex;flex-direction:column}
a.card:hover{border-color:var(--faint);transform:translateY(-2px)}
.card h3{font-size:18px;margin-bottom:10px}
.card p{font-size:14.5px;line-height:1.6;color:var(--muted);margin:0}
.card .more{margin-top:auto;padding-top:16px;font-family:var(--heading);font-size:13px;color:var(--text)}
.card .cn{font-family:var(--body);font-weight:400;color:var(--faint);font-size:14px;margin-left:6px}

/* articles */
.articles{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
.article-card img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--radius);background:var(--soft);transition:transform .5s}
.article-card .imgw{overflow:hidden;border-radius:var(--radius)}
.article-card:hover img{transform:scale(1.03)}
.meta{font-size:13px;color:var(--muted);margin:14px 0 6px;display:flex;gap:10px}
.meta i{font-style:normal;color:var(--line)}
.article-card h3{font-family:var(--body);font-size:16px;font-weight:600;line-height:1.45}

/* lists */
.list{list-style:none;margin:0;padding:0}
.list>li{display:grid;grid-template-columns:140px 1fr;gap:24px;padding:18px 0;border-top:1px solid var(--line)}
.list>li:first-child{border-top:0;padding-top:0}
.list .when{font-size:13.5px;color:var(--muted);padding-top:2px}
.list .what{font-weight:500;color:var(--text);line-height:1.5}
.list .where{font-size:14px;color:var(--muted);margin-top:4px}
.list .what a{text-decoration:none}
.list .what a:hover{text-decoration:underline;text-decoration-color:var(--faint)}
.status{display:inline-block;font-family:var(--heading);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--text);border:1px solid var(--line);border-radius:999px;padding:2px 10px;margin-left:6px;vertical-align:2px}
.pub-title{font-weight:500;color:var(--text)}

.book{display:grid;grid-template-columns:150px 1fr;gap:28px;padding:26px 0;border-top:1px solid var(--line)}
.book:first-child{border-top:0;padding-top:0}
.cover{aspect-ratio:2/3;border-radius:12px;background:linear-gradient(160deg,#f3f3f2,#e9e9e7);display:flex;flex-direction:column;justify-content:flex-end;padding:14px;font-family:var(--heading);font-size:12px;line-height:1.3;color:var(--text)}
.cover b{font-weight:500;font-size:14px;display:block;margin-bottom:6px}
.book h3{font-size:19px;line-height:1.35;margin-bottom:6px}
.book .sub{color:var(--muted);font-size:14px;margin-bottom:14px}

.exp{display:grid;grid-template-columns:1fr auto;gap:4px 20px;padding:18px 0;border-top:1px solid var(--line)}
.exp:first-child{border-top:0;padding-top:0}
.exp h3{font-family:var(--heading);font-size:16px}
.exp .r{font-size:14px;color:var(--muted);text-align:right}
.exp .d{grid-column:1/-1;font-size:14px;color:var(--muted)}

.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.tags span{font-size:13px;border:1px solid var(--line);border-radius:999px;padding:4px 12px;color:var(--muted)}

/* article page */
.article{max-width:760px;margin:0 auto;padding:64px 40px 40px}
.article h1{font-size:40px;line-height:1.2;margin:10px 0 28px}
.article .hero{border-radius:var(--radius);width:100%;margin:0 0 32px}
.article p{font-size:17px;line-height:1.8;margin:0 0 20px}
.article blockquote{margin:0 0 24px;padding:0 0 0 22px;border-left:2px solid var(--line);font-size:17px;line-height:1.8;color:var(--text)}
.article figcaption{font-size:13px;color:var(--muted);margin:-20px 0 32px}
.note{font-size:13.5px;color:var(--muted);border-top:1px solid var(--line);padding-top:20px;margin-top:40px}
.back{font-family:var(--heading);font-size:14px;color:var(--muted)}
.back:hover{color:var(--text)}

/* forms */
.form{display:grid;gap:16px;max-width:620px}
.form label{font-family:var(--heading);font-size:13px;color:var(--muted);display:grid;gap:6px}
.form input,.form textarea,.form select{font:inherit;color:var(--ink);border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:#fff;width:100%}
.form input:focus,.form textarea:focus,.form select:focus{outline:none;border-color:var(--text)}
.form textarea{min-height:150px;resize:vertical}

/* footer */
.site-footer{margin-top:80px;border-top:1px solid var(--line)}
.foot{max-width:var(--wrap);margin:0 auto;padding:44px 40px 56px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.foot .brand{font-size:20px}
.foot p{font-size:14px;color:var(--muted);margin:10px 0 0}
.foot h4{font-family:var(--heading);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:500;margin-bottom:12px}
.foot ul{list-style:none;margin:0;padding:0;columns:2;column-gap:20px}
.foot li{font-size:14px;margin:0 0 8px}
.foot li a:hover{color:var(--ink)}
.copy{max-width:var(--wrap);margin:0 auto;padding:0 40px 40px;font-size:12.5px;color:var(--faint)}

/* motion */
.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .7s ease,transform .7s ease}
.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}*{transition:none!important}}

/* responsive */
@media (max-width:1100px){
  .nav{display:none}.menu-btn{display:inline-flex}.bar .btn.chat{display:none}
  .mobile-nav{position:fixed;inset:76px 0 0;background:#fff;z-index:49;padding:24px 24px 40px;overflow:auto;display:none}
  .mobile-nav.open{display:block}
  .mobile-nav a{display:block;font-family:var(--heading);font-size:22px;color:var(--text);padding:10px 0;border-bottom:1px solid var(--line)}
  .mobile-nav .grp{font-family:var(--heading);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin:22px 0 4px}
  .split{grid-template-columns:1fr;padding:0 24px}
  .profile{position:static;border-right:0;border-bottom:1px solid var(--line);min-height:0;padding:40px 0}
  .content{padding:40px 0}
}
@media (max-width:760px){
  .bar{padding:0 16px;height:68px}
  .mobile-nav{inset:68px 0 0}
  .wrap,.split{padding:0 16px}
  .profile .jump{display:none}
  .profile img{width:160px;height:160px}
  .page-head{padding:44px 0 24px}.page-head h1{font-size:32px}
  .row{grid-template-columns:1fr;gap:18px;padding:34px 0}
  .row>h2{position:static}
  .cards,.articles{grid-template-columns:1fr}
  .list>li{grid-template-columns:1fr;gap:4px}
  .book{grid-template-columns:1fr}.cover{max-width:140px}
  .article{padding:40px 16px}.article h1{font-size:30px}
  .foot{grid-template-columns:1fr;padding:36px 16px}.copy{padding:0 16px 32px}
  .exp{grid-template-columns:1fr}.exp .r{text-align:left}
}
.content .row{grid-template-columns:1fr;gap:22px}
.content .row>h2{position:static}
.split{grid-template-columns:360px 1fr}
.content .book{grid-template-columns:130px 1fr}
@media (max-width:1100px){.split{grid-template-columns:1fr}}
@media (max-width:760px){.content .book{grid-template-columns:1fr}}
.price{font-family:var(--heading);font-size:28px;font-weight:500;color:var(--text);margin:18px 0 6px!important;letter-spacing:-.02em}
.price span{font-size:14px;color:var(--muted);font-weight:400;margin-left:4px}