/* zachhammond.com book pages: fonts, tokens, header and footer shared with the home page. Each page adds its own css. */
@font-face{font-family:"Archivo Poster";src:url(/assets/fonts/archivo-poster.woff2) format("woff2");font-weight:800;font-style:normal;font-display:swap}
@font-face{font-family:"Archivo Wide";src:url(/assets/fonts/archivo-wide.woff2) format("woff2");font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:"Archivo Semi";src:url(/assets/fonts/archivo-semi.woff2) format("woff2");font-weight:800;font-style:normal;font-display:swap}
@font-face{font-family:"Source Serif 4";src:url(/assets/fonts/source-serif-4-var.woff2) format("woff2");font-weight:200 900;font-style:normal;font-display:swap}
@font-face{font-family:"Source Serif 4";src:url(/assets/fonts/source-serif-4-italic-var.woff2) format("woff2");font-weight:200 900;font-style:italic;font-display:swap}

:root{
  --midnight:#050B1A;
  --deep:#0A1736;
  --navy:#0F2350;
  --royal:#163A80;
  --slate:#22385C;
  --slate-2:#33507A;
  --paper:#D9E9F8;
  --ice:#9ED3FF;
  --ice-2:#CBE8FF;
  --ink:#0C1D42;
  --link-on-paper:#174C99;
  --text:#EEF4FF;
  --muted:#B1C4DE;
  --gutter:clamp(16px,4.2vw,64px);
  --poster:"Archivo Poster","Arial Narrow",Arial,sans-serif;
  --label:"Archivo Wide",Arial,sans-serif;
  --semi:"Archivo Semi",Arial,sans-serif;
  --serif:"Source Serif 4",Georgia,"Times New Roman",serif;
  color-scheme:dark;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--midnight);color:var(--text);font:400 clamp(17px,1.15vw,19px)/1.62 var(--serif);position:relative;overflow-x:hidden}
img{display:block;max-width:100%;height:auto}
a{color:inherit}
h1,h2,h3,p,ol,ul,figure{margin:0}
ol,ul{list-style:none;padding:0}
em{font-style:normal}
:focus-visible{outline:3px solid var(--ice);outline-offset:3px;border-radius:2px}
.skip{position:absolute;left:12px;top:-60px;z-index:50;background:var(--ice);color:var(--ink);padding:14px 16px;min-height:44px;font:700 15px var(--label);text-decoration:none}
.skip:focus{top:12px}
.wrap{position:relative;z-index:2;padding-inline:var(--gutter);max-width:1920px;margin-inline:auto}

/* type and buttons */
.kicker{font:700 13px/1.3 var(--label);letter-spacing:.2em;text-transform:uppercase;color:var(--ice)}
.kicker--dark{color:var(--link-on-paper)}
.wall{font-family:var(--poster);font-weight:800;text-transform:uppercase;line-height:.84;letter-spacing:-.004em;color:#fff}
.wall em{color:var(--ice)}
.wall span{display:block}
.lede{max-width:40ch;color:var(--muted);font-size:clamp(18px,1.35vw,22px)}
.textlink{display:inline-flex;align-items:center;gap:.4em;min-height:44px;color:var(--ice);font:700 14px/1.2 var(--label);letter-spacing:.08em;text-transform:uppercase;text-decoration:none;border-bottom:0}
.textlink:hover{text-decoration:underline;text-underline-offset:4px}
.ext{width:.95em;height:.95em;flex:none}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;min-height:52px;padding:0 24px;font:700 15px/1.1 var(--label);letter-spacing:.09em;text-transform:uppercase;text-decoration:none;border-radius:999px;transition:background .2s,color .2s,border-color .2s}
.btn--ice{background:var(--ice);color:var(--ink)}
.btn--ice:hover{background:#fff}
.btn--line{border:2px solid rgba(158,211,255,.75);color:#fff}
.btn--line:hover{border-color:#fff}

/* header */
.top{position:fixed;inset:0 0 auto 0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px var(--gutter);transition:background .3s, box-shadow .3s}
.top::before{content:"";position:absolute;inset:0 0 -40px 0;z-index:-1;background:linear-gradient(180deg,rgba(5,11,26,.85),rgba(5,11,26,.55) 55%,rgba(5,11,26,0));pointer-events:none;transition:opacity .3s}
.top.is-solid::before{opacity:0}
.top.is-solid{background:rgba(5,11,26,.92);box-shadow:0 1px 0 rgba(158,211,255,.14)}
@supports (backdrop-filter:blur(8px)){.top.is-solid{background:rgba(5,11,26,.78);backdrop-filter:blur(10px)}}
.brand{display:inline-flex;align-items:center;gap:12px;min-height:44px;text-decoration:none;color:#fff}
.brand svg{width:44px;height:44px;flex:none}
.brand__name{font:800 21px/1 var(--poster);letter-spacing:.06em;text-transform:uppercase}
.nav{display:flex;align-items:center;gap:6px}
.nav a{display:inline-flex;align-items:center;min-height:44px;padding:0 12px;font:700 13px var(--label);letter-spacing:.14em;text-transform:uppercase;text-decoration:none;color:var(--text)}
.nav a:hover{color:var(--ice)}
.nav .nav__cta{border:2px solid rgba(158,211,255,.7);border-radius:999px;padding:0 18px;margin-left:8px}


/* footer */
.foot{background:var(--midnight);border-top:1px solid rgba(158,211,255,.14);padding:36px 0 44px;position:relative;z-index:2}
.foot__grid{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px 32px}
.foot__links{display:flex;flex-wrap:wrap;gap:0 26px}
.foot__note{width:100%;color:var(--muted);font-size:14px}
@media (max-width:980px){
  .nav a:not(.nav__cta){display:none}
  .brand__name{font-size:18px}
}