:root{
  --bg:#fbfaf7;
  --surface:#ffffff;
  --surface-soft:#f4f1ea;
  --text:#142033;
  --muted:#5f6b7a;
  --line:#e5e0d6;
  --accent:#3147a8;
  --accent-2:#6d4ed7;
  --accent-soft:#eef1ff;
  --code-bg:#f1f5f9;
  --shadow:0 24px 60px rgba(20,32,51,.08);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:18px;line-height:1.72;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:var(--accent);text-decoration:none;text-underline-offset:3px}a:hover{text-decoration:underline}img{max-width:100%;height:auto}.wrap{width:min(1120px,calc(100% - 40px));margin:0 auto}.narrow,.article-narrow{width:min(820px,calc(100% - 40px));margin:0 auto}.skip-link,.screen-reader-text{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}.skip-link:focus{left:20px;top:20px;width:auto;height:auto;background:#fff;padding:10px 14px;z-index:999;border:1px solid var(--line)}
.site-header{position:sticky;top:0;z-index:50;background:rgba(251,250,247,.92);backdrop-filter:saturate(140%) blur(14px);border-bottom:1px solid rgba(229,224,214,.8)}.header-inner{min-height:78px;display:flex;align-items:center;justify-content:space-between;gap:28px}.site-brand{display:flex;align-items:center;gap:12px;color:var(--text)}.site-brand:hover{text-decoration:none}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:13px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;font-weight:800;letter-spacing:.02em}.brand-text{display:flex;flex-direction:column;line-height:1.15}.brand-text strong{font-size:1.14rem;letter-spacing:-.03em}.brand-text small{font-size:.78rem;color:var(--muted);max-width:310px}.primary-nav .menu{list-style:none;display:flex;gap:22px;margin:0;padding:0;align-items:center}.primary-nav a{color:#263248;font-size:.94rem;font-weight:650}.menu-toggle{display:none;background:transparent;border:0;padding:8px}.menu-toggle span:not(.screen-reader-text){display:block;width:24px;height:2px;background:var(--text);margin:5px 0;border-radius:2px}
.hero{padding:72px 0 54px}.hero-grid{display:grid;grid-template-columns:minmax(0,1.18fr) minmax(340px,.82fr);gap:42px;align-items:center}.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:.76rem;font-weight:800;color:var(--accent);margin:0 0 14px}.hero h1,.page-hero h1,.article-header h1{font-family:Georgia,"Times New Roman",serif;line-height:1.08;letter-spacing:-.045em;margin:0;color:#111a2b}.hero h1{font-size:clamp(2.45rem,6vw,5.2rem);max-width:930px}.lead{font-size:1.2rem;line-height:1.75;color:var(--muted);max-width:760px;margin:24px 0 0}.hero-actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:12px 20px;font-weight:750;border:1px solid transparent}.button.primary{background:var(--text);color:#fff}.button.secondary{border-color:var(--line);color:var(--text);background:#fff}.button:hover{text-decoration:none;transform:translateY(-1px)}.research-card{background:var(--surface);border:1px solid var(--line);border-radius:28px;padding:30px;box-shadow:var(--shadow)}.research-card h2{font-size:1.55rem;line-height:1.25;margin:8px 0 12px;letter-spacing:-.03em}.card-label{font-size:.76rem;text-transform:uppercase;letter-spacing:.13em;font-weight:800;color:var(--accent-2)}.research-card p{color:var(--muted)}.check-list{padding:0;margin:22px 0 0;list-style:none}.check-list li{padding:9px 0 9px 30px;border-top:1px solid var(--line);position:relative}.check-list li:before{content:"";position:absolute;left:0;top:18px;width:9px;height:9px;border-radius:99px;background:var(--accent)}
.section{padding:68px 0}.section.muted{background:var(--surface-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.section-head{margin-bottom:26px}.section-head h2,.split-layout h2{font-family:Georgia,"Times New Roman",serif;font-size:clamp(2rem,3vw,3rem);line-height:1.14;letter-spacing:-.035em;margin:0;max-width:820px}.section-intro{max-width:780px;color:var(--muted);font-size:1.08rem}.row-between{display:flex;align-items:end;justify-content:space-between;gap:20px}.track-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.track-card,.post-card,.side-box,.empty-state{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:24px}.track-card span{font-weight:900;color:var(--accent);font-size:.85rem}.track-card h3{font-size:1.22rem;line-height:1.25;margin:28px 0 10px;letter-spacing:-.025em}.track-card p,.post-card p,.side-box li,.empty-state p{color:var(--muted)}.experiment-path{background:#111827;color:#e5edf7}.experiment-path .eyebrow{color:#aebcff}.experiment-path h2{color:#fff}.experiment-path .section-intro{color:#c4cedb}.experiment-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.experiment-step{border:1px solid rgba(255,255,255,.14);border-radius:var(--radius);padding:24px;background:rgba(255,255,255,.045)}.experiment-step span{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:999px;background:#fff;color:var(--accent);font-weight:900;font-size:.86rem}.experiment-step h3{color:#fff;font-size:1.18rem;line-height:1.25;margin:26px 0 10px;letter-spacing:-.025em}.experiment-step p{color:#c4cedb;margin:0}.split-layout{display:grid;grid-template-columns:.85fr 1.15fr;gap:42px}.timeline{display:grid;gap:12px}.timeline div{background:#fff;border:1px solid var(--line);border-radius:16px;padding:18px 20px;display:grid;grid-template-columns:120px 1fr;gap:20px}.timeline strong{color:var(--accent)}.timeline span{color:var(--muted)}
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.post-list{display:grid;gap:20px}.post-card{padding:0;overflow:hidden;transition:transform .16s ease,box-shadow .16s ease}.post-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.post-card-body,.placeholder-card{padding:24px}.post-card h2,.post-card h3{font-size:1.34rem;line-height:1.26;margin:10px 0 10px;letter-spacing:-.03em}.post-card h2 a,.post-card h3 a{color:var(--text)}.post-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:.86rem;color:var(--muted)}.meta-dot{color:#a0a7b3}.post-meta a{color:var(--muted)}.read-more,.text-link{font-weight:800}.post-thumb{display:block;aspect-ratio:16/9;background:var(--surface-soft);overflow:hidden}.post-thumb img{width:100%;height:100%;object-fit:cover;display:block}.placeholder-card{padding:24px}
.page-hero{padding:68px 0 44px;background:linear-gradient(180deg,#fff,rgba(255,255,255,0))}.page-hero.compact h1{font-size:clamp(2.25rem,5vw,4rem)}.page-hero p{color:var(--muted);font-size:1.12rem}.content-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:34px}.sidebar{display:grid;align-content:start;gap:18px;position:sticky;top:100px}.side-box h2{font-size:1rem;margin:0 0 10px}.side-box ul{margin:0;padding-left:20px}
.article-header{padding:72px 0 30px;background:linear-gradient(180deg,#fff,rgba(255,255,255,0))}.article-header h1{font-size:clamp(2.35rem,5vw,4.8rem);margin-top:16px}.article-subtitle{font-size:1.22rem;line-height:1.7;color:var(--muted);max-width:760px}.article-featured img{border-radius:24px;border:1px solid var(--line);box-shadow:var(--shadow)}.article-layout{display:grid;grid-template-columns:minmax(0,780px);justify-content:center;padding:32px 0 44px}.article-content{font-family:Georgia,"Times New Roman",serif;font-size:1.18rem;line-height:1.86}.article-content>*{margin-top:0;margin-bottom:1.35em}.article-content h2,.article-content h3,.article-content h4{font-family:Inter,ui-sans-serif,system-ui,sans-serif;line-height:1.22;letter-spacing:-.03em;margin-top:2em;color:#111a2b}.article-content h2{font-size:2rem}.article-content h3{font-size:1.45rem}.article-content p,.article-content li{color:#273449}.article-content a{text-decoration:underline}.article-content blockquote{margin:2em 0;padding:6px 0 6px 24px;border-left:4px solid var(--accent);color:#273449;font-style:italic;background:transparent}.article-content pre{overflow:auto;background:var(--code-bg);border:1px solid #d9e1ec;border-radius:16px;padding:18px;font-size:.95rem;line-height:1.6}.article-content code{font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;background:var(--code-bg);border:1px solid #d9e1ec;border-radius:7px;padding:.1em .35em;font-size:.88em}.article-content pre code{background:transparent;border:0;padding:0}.article-content table{width:100%;border-collapse:collapse;font-family:Inter,ui-sans-serif,system-ui,sans-serif;font-size:.98rem}.article-content th,.article-content td{border:1px solid var(--line);padding:10px 12px;text-align:left}.article-content th{background:#f8fafc}.article-content .katex{font-size:1.06em}.article-content .katex-display{overflow-x:auto;overflow-y:hidden;padding:.45rem 0 .6rem;margin:1.55em 0}.article-content .katex-display>.katex{white-space:nowrap}.article-footer{padding:0 0 70px}.tag-list{display:flex;gap:8px;flex-wrap:wrap}.tag-list a{background:var(--accent-soft);border:1px solid #dbe2ff;padding:6px 10px;border-radius:999px;font-size:.86rem;font-weight:700}.post-nav{display:flex;justify-content:space-between;gap:20px;margin-top:26px;padding-top:22px;border-top:1px solid var(--line);font-weight:800}
.search-form{display:flex;gap:8px;margin-top:16px}.search-form label{flex:1}.search-field{width:100%;border:1px solid var(--line);border-radius:999px;background:#fff;padding:11px 14px;font:inherit;font-size:.95rem}.search-form button{border:0;background:var(--text);color:#fff;border-radius:999px;padding:0 14px;font-weight:800}.pagination-wrap{margin-top:20px}.nav-links{display:flex;gap:12px;flex-wrap:wrap}.page-numbers{background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 12px}.page-numbers.current{background:var(--text);color:#fff}.site-footer{background:#111827;color:#dbe3ef;padding:56px 0 20px}.footer-grid{display:grid;grid-template-columns:1.2fr .8fr .8fr;gap:42px}.footer-brand{color:#fff;font-weight:900;font-size:1.4rem;letter-spacing:-.03em}.site-footer p,.site-footer li,.footer-bottom{color:#aeb9c8}.site-footer h2{color:#fff;font-size:1rem;margin:0 0 12px}.site-footer ul{padding-left:18px;margin:0}.site-footer .search-field{background:#1f2937;border-color:#374151;color:#fff}.footer-bottom{display:flex;justify-content:space-between;gap:20px;border-top:1px solid #2b3545;margin-top:36px;padding-top:18px;font-size:.88rem}
@media (max-width: 920px){.hero-grid,.split-layout,.content-layout{grid-template-columns:1fr}.track-grid,.post-grid,.experiment-steps{grid-template-columns:repeat(2,1fr)}.sidebar{position:static}.article-content{font-size:1.1rem}.primary-nav{display:none;position:absolute;left:20px;right:20px;top:78px;background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:16px}.primary-nav.is-open{display:block}.primary-nav .menu{display:grid;gap:8px}.primary-nav a{display:block;padding:8px}.menu-toggle{display:block}.footer-grid{grid-template-columns:1fr 1fr}.footer-bottom{flex-direction:column}}
@media (max-width: 640px){body{font-size:17px}.wrap,.narrow,.article-narrow{width:min(100% - 28px,1120px)}.hero{padding:46px 0 36px}.hero h1{font-size:2.55rem}.track-grid,.post-grid,.experiment-steps{grid-template-columns:1fr}.timeline div{grid-template-columns:1fr;gap:4px}.row-between{display:block}.article-header{padding-top:46px}.article-header h1{font-size:2.35rem}.article-content h2{font-size:1.65rem}.post-nav{display:grid}.footer-grid{grid-template-columns:1fr}.search-form{flex-direction:column}.search-form button{padding:10px 14px}}