@import url('https://fonts.googleapis.com/css2?family=Hanken+Grotesk:ital,wght@0,400;0,500;0,600;0,700;0,800;1,400;1,700&display=swap');

:root{
  --brand:#2F63E6; --brand-ink:#204EC8;
  --ink:#12151B; --soft:#3A424E; --muted:#5B6472; --faint:#8A92A0;
  --line:#EBEDF1; --line2:#E2E5EA;
  --bg:#F5F6F8; --bg2:#FAFBFC; --paper:#fff; --dark:#12151B;
  --green:#0F7A56; --greenbg:#E4F4EE; --amber:#9A6206; --amberbg:#FBF1DF;
  --shadow:0 1px 2px rgba(16,24,40,.04);
  --shadow-lg:0 24px 60px -22px rgba(16,24,40,.28), 0 8px 22px -14px rgba(16,24,40,.14);
  --font:'Hanken Grotesk',-apple-system,BlinkMacSystemFont,sans-serif;
  --max:1560px; --gutter:clamp(16px,3.4vw,44px);
  --paper-gray:#ECECE8;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;}
body{font-family:var(--font);background:var(--paper-gray);color:var(--ink);line-height:1.5;font-size:16px;overflow-x:clip;position:relative;}
body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.5;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.045'/%3E%3C/svg%3E");}
::selection{background:var(--brand);color:#fff;}
a{color:var(--brand);text-decoration:none;}
a:hover{color:var(--brand-ink);}
.container{max-width:var(--max);margin:0 auto;padding:0 var(--gutter);position:relative;z-index:1;}
h1,h2,h3{letter-spacing:-.02em;color:var(--ink);}

/* reading progress */
.progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--brand);z-index:80;transition:width .1s linear;}

/* nav — floating pill */
.nav{position:sticky;top:0;z-index:50;padding:18px var(--gutter) 14px;background:var(--paper-gray);}
.nav__inner{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:10px 13px 10px 22px;max-width:calc(var(--max) - 2 * var(--gutter));margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:16px;box-shadow:0 10px 34px -14px rgba(16,24,40,.18);}
.logo{display:flex;align-items:center;gap:13px;font-weight:800;font-size:23px;color:var(--ink);letter-spacing:-.02em;}
.logo__mark{width:35px;height:35px;border-radius:10px;background:#fff;display:grid;place-items:center;box-shadow:0 2px 8px rgba(16,24,40,.12);border:1px solid #EDEFF2;flex-shrink:0;}
.logo__mark svg{width:26px;height:26px;}
.nav__links{display:flex;gap:6px;align-items:center;}
.nav__link{display:inline-flex;align-items:center;gap:6px;color:var(--ink);font-size:17px;font-weight:700;letter-spacing:-.01em;padding:9px 15px;border-radius:10px;transition:background .14s;white-space:nowrap;}
.nav__link:hover{background:var(--bg);}
.nav__link.is-active{background:var(--bg);}
.nav__link svg{width:15px;height:15px;opacity:.55;transition:transform .18s ease,opacity .18s ease;}
.nav__link:hover svg{transform:rotate(180deg);opacity:1;}
.nav__right{display:flex;align-items:center;gap:6px;}
.nav__login{color:var(--ink);font-size:17px;font-weight:700;padding:9px 15px;border-radius:10px;transition:background .14s;}
.nav__login:hover{background:var(--bg);}
.nav__cta{display:inline-flex;align-items:center;gap:2px;}
.nav__cta-label{background:var(--ink);color:#fff;font-weight:700;font-size:17px;padding:11px 18px;border-radius:12px 4px 4px 12px;transition:background .14s;white-space:nowrap;}
.nav__cta-label:hover{background:#000;}
.nav__cta-arrow{width:46px;height:46px;flex-shrink:0;display:grid;place-items:center;background:var(--brand);color:#fff;border-radius:4px 12px 12px 4px;transition:background .14s;}
.nav__cta-arrow:hover{background:var(--brand-ink);}
.nav__cta-arrow svg{width:22px;height:22px;}

/* article header */
.ahead{padding:clamp(40px,6vw,72px) 0 clamp(24px,3vw,36px);}
.crumbs{display:flex;align-items:center;gap:9px;font-size:13px;font-weight:700;color:var(--faint);margin-bottom:26px;}
.crumbs a{color:var(--faint);}
.crumbs a:hover{color:var(--brand);}
.crumbs svg{width:14px;height:14px;opacity:.6;}
.tag{display:inline-flex;align-items:center;gap:8px;padding:6px 14px;background:#fff;border:1px solid var(--line);border-radius:100px;font-size:12px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--brand);margin-bottom:24px;}
.tag .dot{width:7px;height:7px;border-radius:50%;background:var(--brand);}
.atitle{font-size:clamp(38px,6vw,78px);font-weight:800;line-height:1.02;letter-spacing:-.03em;max-width:16ch;}
.adek{font-size:clamp(18px,2vw,23px);line-height:1.55;color:var(--soft);font-weight:500;max-width:60ch;margin-top:24px;}
.ameta-bar{position:sticky;top:96px;z-index:30;background:var(--paper-gray);padding:6px 0 16px;}
.ameta{display:inline-flex;align-items:center;gap:18px;flex-wrap:wrap;background:#fff;border:1px solid var(--line);border-radius:18px;padding:15px 24px;box-shadow:0 14px 34px -22px rgba(16,24,40,.4);}
.ameta__avatar{width:46px;height:46px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font-weight:800;font-size:16px;letter-spacing:-.02em;flex-shrink:0;}
.ameta__who{font-weight:700;font-size:15px;letter-spacing:-.01em;}
.ameta__role{font-size:13px;color:var(--muted);font-weight:500;}
.ameta__sep{width:1px;height:30px;background:var(--line2);}
.ameta__bit{font-size:14px;font-weight:600;color:var(--muted);display:inline-flex;align-items:center;gap:7px;}
.ameta__bit svg{width:15px;height:15px;opacity:.6;}

/* article body layout */
.alayout{display:grid;grid-template-columns:1fr 460px;gap:clamp(48px,6vw,120px);align-items:start;padding:clamp(30px,4vw,54px) 0 clamp(60px,8vw,110px);}

/* toc */
.toc{position:sticky;top:206px;grid-column:2;grid-row:1;background:#fff;border:1px solid var(--line);border-radius:26px;padding:30px 26px;box-shadow:var(--shadow-lg);}
.toc__title{font-size:24px;font-weight:800;letter-spacing:-.02em;margin-bottom:22px;}
.toc__list{display:flex;flex-direction:column;gap:10px;}
.toc__item{display:flex;align-items:center;gap:14px;padding:12px;background:#F4F4F1;border:1px solid transparent;border-radius:16px;color:var(--ink);transition:background .16s,border-color .16s,box-shadow .16s;}
.toc__item:hover{background:#fff;border-color:var(--line2);box-shadow:var(--shadow);color:var(--ink);}
.toc__num{width:44px;height:44px;flex-shrink:0;background:#fff;border:1px solid var(--line);border-radius:11px;display:grid;place-items:center;color:var(--ink);transition:background .16s,color .16s,border-color .16s;}
.toc__num svg{width:19px;height:19px;}
.toc__txt{font-size:15.5px;font-weight:700;letter-spacing:-.01em;line-height:1.28;}
.toc__item.is-active{background:#fff;border-color:var(--brand);box-shadow:0 8px 22px -14px rgba(47,99,230,.5);}
.toc__item.is-active .toc__num{background:var(--brand);border-color:var(--brand);color:#fff;}
.toc__item.is-active .toc__txt{color:var(--brand-ink);}

/* prose */
.prose{max-width:980px;grid-column:1;grid-row:1;min-width:0;}
.prose > p{font-size:clamp(18px,1.55vw,21px);line-height:1.62;color:#232830;font-weight:500;margin-bottom:26px;}
.prose > p b, .prose > p strong{font-weight:700;color:var(--ink);}
.prose .lede{font-size:clamp(20px,1.8vw,24px);line-height:1.5;color:var(--ink);font-weight:600;}
.a-sec{scroll-margin-top:130px;padding-top:14px;}
.a-sec h2{font-size:clamp(32px,4.6vw,64px);font-weight:800;line-height:1.03;letter-spacing:-.03em;margin:clamp(34px,5vw,60px) 0 22px;}
.a-sec:first-of-type h2{margin-top:8px;}
.blist{list-style:none;margin:0 0 30px;display:flex;flex-direction:column;gap:16px;}
.blist li{position:relative;padding-left:34px;font-size:clamp(18px,1.55vw,21px);line-height:1.5;color:#232830;font-weight:600;}
.blist li::before{content:"";position:absolute;left:0;top:.2em;width:20px;height:20px;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Crect x='3' y='3' width='12' height='12' rx='3.2' fill='%232F63E6'/%3E%3Crect x='9' y='9' width='12' height='12' rx='3.2' fill='%23F5194B'/%3E%3C/svg%3E") center/contain no-repeat;}

/* callout */
.callout{background:#fff;border:1px solid var(--line);border-left:4px solid var(--brand);border-radius:14px;padding:22px 26px;margin:8px 0 30px;box-shadow:var(--shadow);}
.callout__label{font-size:11px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--brand);margin-bottom:8px;}
.callout p{font-size:16px;line-height:1.55;color:var(--soft);font-weight:500;margin:0;}

/* inline cta */
.cta{background:var(--dark);border-radius:22px;padding:clamp(30px,4vw,48px);margin:40px 0;color:#fff;position:relative;overflow:hidden;}
.cta__ey{font-size:12px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:#8FB0FF;margin-bottom:14px;}
.cta h3{color:#fff;font-size:clamp(24px,3vw,36px);font-weight:800;letter-spacing:-.02em;line-height:1.1;max-width:20ch;}
.cta p{color:rgba(255,255,255,.72);font-size:16px;line-height:1.55;font-weight:500;max-width:52ch;margin-top:14px;}
.cta__row{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px;}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 24px;font-size:15px;font-weight:700;border-radius:8px;border:1px solid transparent;cursor:pointer;transition:all .16s ease;font-family:inherit;}
.btn--white{background:#fff;color:var(--ink);}
.btn--white:hover{transform:translateY(-1px);color:var(--ink);}
.btn--dark-ghost{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.22);}
.btn--dark-ghost:hover{background:rgba(255,255,255,.16);color:#fff;}
.btn .arrow{transition:transform .16s;}
.btn:hover .arrow{transform:translateX(3px);}

/* author box */
.authorbox{display:flex;gap:20px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:20px;padding:26px 28px;margin-top:20px;box-shadow:var(--shadow);}
.authorbox__av{width:58px;height:58px;border-radius:50%;background:var(--ink);color:#fff;display:grid;place-items:center;font-weight:800;font-size:19px;flex-shrink:0;}
.authorbox__name{font-weight:800;font-size:17px;letter-spacing:-.01em;}
.authorbox__role{font-size:13px;color:var(--brand);font-weight:700;margin-bottom:8px;}
.authorbox__bio{font-size:14.5px;color:var(--muted);line-height:1.55;font-weight:500;}

/* related */
.related{border-top:1px solid var(--line2);padding:clamp(50px,7vw,88px) 0;}
.related__head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:34px;flex-wrap:wrap;}
.related__head h2{font-size:clamp(26px,3vw,40px);font-weight:800;letter-spacing:-.02em;}
.related__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.pcard{display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden;transition:transform .18s ease,box-shadow .18s ease;color:var(--ink);}
.pcard:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);color:var(--ink);}
.pcard__cover{aspect-ratio:16/10;background:linear-gradient(135deg,var(--c1,#2F63E6),var(--c2,#204EC8));position:relative;overflow:hidden;}
.pcard__glyph{position:absolute;inset:0;display:flex;align-items:center;justify-content:flex-start;text-align:left;padding:0 24px;font-size:clamp(30px,3vw,44px);font-weight:800;color:#fff;letter-spacing:-.02em;line-height:1.05;}
.pcard__badge{position:absolute;top:15px;left:16px;display:inline-flex;align-items:center;padding:6px 12px;background:rgba(255,255,255,.18);border:1px solid rgba(255,255,255,.34);border-radius:100px;font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#fff;}
.pcard__body{padding:20px 22px 24px;display:flex;flex-direction:column;flex:1;}
.pcard__cat{font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);margin-bottom:10px;}
.pcard__title{font-size:19px;font-weight:800;letter-spacing:-.02em;line-height:1.22;margin-bottom:14px;}
.pcard__meta{margin-top:auto;font-size:13px;color:var(--faint);font-weight:600;}

/* footer */
.footer{background:#fff;color:var(--ink);border-top:1px solid var(--line);padding:64px 0 26px;position:relative;z-index:1;}
.footer__top{display:grid;grid-template-columns:1fr 1fr 1fr 1fr;gap:36px;padding-bottom:44px;}
.footer__col-title{font-size:11px;text-transform:uppercase;letter-spacing:.14em;color:var(--faint);margin-bottom:22px;font-weight:700;}
.footer__link{display:block;color:var(--ink);font-size:16px;margin-bottom:16px;font-weight:500;letter-spacing:-.01em;transition:color .14s;}
.footer__link:hover{color:var(--brand);}
.footer__mid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px;padding:44px 0;border-top:1px solid var(--line);align-items:start;}
.footer__nl-title{font-size:19px;font-weight:800;letter-spacing:-.02em;margin-bottom:12px;}
.footer__nl-txt{font-size:13.5px;color:var(--muted);line-height:1.6;max-width:420px;margin-bottom:22px;}
.footer__nl-form{display:flex;border:1px solid var(--line2);border-radius:8px;overflow:hidden;max-width:520px;}
.footer__nl-form input{flex:1;border:none;outline:none;padding:15px 18px;font-size:14px;color:var(--ink);font-family:inherit;background:#fff;}
.footer__nl-form button{background:var(--brand);color:#fff;border:none;padding:0 26px;font-weight:700;font-size:12.5px;letter-spacing:.06em;text-transform:uppercase;cursor:pointer;transition:background .14s;}
.footer__nl-form button:hover{background:var(--brand-ink);}
.footer__contact{font-size:16px;font-weight:600;color:var(--ink);margin-bottom:36px;}
.footer__contact a{color:var(--ink);}
.footer__office-city{font-size:16px;font-weight:700;letter-spacing:-.01em;margin-bottom:10px;}
.footer__office-addr{font-size:13px;color:var(--muted);line-height:1.7;font-weight:500;}
.footer__social{display:flex;gap:18px;align-items:center;}
.footer__social a{color:var(--ink);transition:color .14s;}
.footer__social a:hover{color:var(--brand);}
.footer__social svg{width:20px;height:20px;}
.footer__bottom{border-top:1px solid var(--line);padding-top:24px;display:flex;gap:38px;font-size:13px;color:var(--muted);flex-wrap:wrap;font-weight:500;}
.footer__bottom a{color:var(--muted);}
.footer__bottom a:hover{color:var(--brand);}
.footer__bottom-sep{flex:1;}

@media(max-width:1000px){
  .alayout{grid-template-columns:1fr;gap:30px;}
  .toc{position:static;order:-1;grid-column:1;grid-row:auto;}
  .prose{grid-column:1;grid-row:auto;}
  .related__grid{grid-template-columns:1fr;}
}
@media(max-width:900px){
  .footer__top{grid-template-columns:1fr 1fr;gap:28px 24px;}
  .footer__mid{grid-template-columns:1fr 1fr;gap:32px 24px;}
}
@media(max-width:600px){
  .nav__links{display:none;}
  .nav__login{display:none;}
  .footer__top{grid-template-columns:1fr 1fr;}
  .footer__bottom{flex-direction:column;gap:10px;}
  .ameta__sep{display:none;}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;}}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:6px;}