/* Layout: one reading column (~68ch) with a wide chapter rail; book-cover look — white page, ink, cover green */
@font-face{font-family:"Bebas Neue";src:url(fonts/bebas-neue-latin-400-normal.woff2) format("woff2");font-display:swap}
@font-face{font-family:Archivo;font-weight:400;src:url(fonts/archivo-latin-400-normal.woff2) format("woff2");font-display:swap}
@font-face{font-family:Archivo;font-weight:500;src:url(fonts/archivo-latin-500-normal.woff2) format("woff2");font-display:swap}
@font-face{font-family:Archivo;font-weight:600;src:url(fonts/archivo-latin-600-normal.woff2) format("woff2");font-display:swap}
@font-face{font-family:Archivo;font-weight:700;src:url(fonts/archivo-latin-700-normal.woff2) format("woff2");font-display:swap}
@font-face{font-family:"JetBrains Mono";font-weight:500;src:url(fonts/jetbrains-mono-latin-500-normal.woff2) format("woff2");font-display:swap}

:root{
  --paper:#ffffff; --paper-2:#f3f5f4; --ink:#231f20; --ink-2:#5a5557; --rule:#dfe3e1;
  --green:#2f8a6b; --green-ink:#ffffff; --green-soft:#e3f2ec; --amber:#a86f00;
  --display:"Bebas Neue","Oswald","Arial Narrow",Impact,sans-serif;
  --body:Archivo,"Helvetica Neue",Arial,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
  --measure:68ch;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --paper:#161415; --paper-2:#211e1f; --ink:#ece9ea; --ink-2:#aaa4a6; --rule:#363133;
  --green:#5cc29f; --green-ink:#10241d; --green-soft:#1b2c26; --amber:#efaf15; color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#161415; --paper-2:#211e1f; --ink:#ece9ea; --ink-2:#aaa4a6; --rule:#363133;
  --green:#5cc29f; --green-ink:#10241d; --green-soft:#1b2c26; --amber:#efaf15; color-scheme:dark}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.65 var(--body)}
a{color:var(--green);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--green);outline-offset:3px;border-radius:2px}
img{max-width:100%;height:auto}

.wrap{max-width:1120px;margin:0 auto;padding-inline:clamp(16px,4vw,40px)}
.top{border-bottom:1px solid var(--rule)}
.top .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.5rem 1.5rem;padding-block:.9rem}
.mark{font-family:var(--display);font-size:1.35rem;letter-spacing:.02em;color:var(--ink);text-decoration:none;line-height:1}
.mark span{color:var(--green)}
.top nav{display:flex;flex-wrap:wrap;gap:.25rem 1.25rem;font-size:.92rem;font-weight:500}
.top nav a{color:var(--ink-2);text-decoration:none}
.top nav a[aria-current]{color:var(--ink)}
.top nav a:hover{color:var(--green)}

.hero .wrap{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,230px);gap:2rem 4rem;align-items:end;padding-block:clamp(2.5rem,7vw,5rem) 2.5rem}
.eyebrow{max-width:none;font:500 .78rem/1.3 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-2);margin:0 0 .9rem}
h1{font-family:var(--display);font-weight:400;font-size:clamp(3.4rem,10vw,7.2rem);line-height:.86;letter-spacing:.005em;margin:0 0 1.4rem;text-wrap:balance}
h1 em{font-style:normal;color:var(--green)}
.lede{font-size:1.2rem;line-height:1.55;max-width:56ch;margin:0 0 1.2rem}
.hero p{max-width:60ch}
.hero p.eyebrow{max-width:none}
.cover{transform:rotate(2.5deg);box-shadow:0 1px 2px #0000001a,0 18px 40px -16px #0000004d;border:1px solid var(--rule);display:block}
.buy{display:flex;flex-wrap:wrap;gap:.5rem 1.2rem;font-size:.95rem;margin-top:1.4rem}

.btn{display:inline-flex;align-items:center;gap:.5rem;background:var(--green);color:var(--green-ink);font-weight:600;font-size:.95rem;padding:.7rem 1.1rem;border-radius:3px;text-decoration:none}
.btn:hover{filter:brightness(1.06)}

/* chapter index */
.index{border-block:1px solid var(--rule);background:var(--paper-2)}
.index .wrap{padding-block:1.6rem}
.index h2{font:600 .8rem/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-2);margin:0 0 1rem}
.index ol{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:.15rem 2rem}
.index li{display:grid;grid-template-columns:2.2rem minmax(0,1fr) auto;gap:.6rem;align-items:baseline;padding:.42rem 0;border-bottom:1px dashed var(--rule);font-size:.95rem}
.index .n{font-family:var(--display);font-size:1.3rem;color:var(--ink-2);line-height:1}
.index a{color:var(--ink);text-decoration:none;font-weight:500}
.index a:hover{color:var(--green)}
.index .c{font:500 .72rem var(--mono);color:var(--green);white-space:nowrap}

/* chapters */
.chapter .wrap{display:grid;grid-template-columns:minmax(0,200px) minmax(0,var(--measure));gap:1rem 3.5rem;padding-block:3.5rem;border-bottom:1px solid var(--rule)}
.rail{position:relative}
.rail .num{font-family:var(--display);font-size:5.2rem;line-height:.8;color:var(--green);display:block}
.rail .lbl{font:500 .75rem/1.5 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--ink-2);display:block;margin-top:.6rem}
.rail .pages{font:500 .75rem/1.6 var(--mono);color:var(--ink-2);margin-top:.9rem}
.body{min-width:0}
h2.ch{font-family:var(--display);font-weight:400;font-size:clamp(2.2rem,5vw,3.2rem);line-height:.95;margin:0 0 1rem;text-wrap:balance}
h3{font-size:1.12rem;font-weight:700;margin:2rem 0 .5rem;text-wrap:balance}
h4{font-size:1rem;font-weight:600;margin:1.3rem 0 .3rem}
.body p,.body li{max-width:var(--measure)}
.body ul,.body ol{padding-left:1.2rem}
.body li{margin:.25rem 0}
blockquote{margin:1.2rem 0;padding:.2rem 0 .2rem 1rem;border-left:3px solid var(--green);font-weight:500}

/* downloads */
.body ul.files,.files{list-style:none;margin:1.4rem 0 1.6rem;padding:0;border-top:1px solid var(--ink)}
.files li{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:.3rem 1rem;align-items:center;padding:.85rem 0;border-bottom:1px solid var(--rule);margin:0;max-width:none}
.tag{font:500 .68rem/1 var(--mono);letter-spacing:.06em;text-transform:uppercase;padding:.38rem .5rem;border:1px solid currentColor;border-radius:2px;color:var(--ink-2);white-space:nowrap}
.tag.ws{color:var(--amber)}
.tag.eb{color:var(--green)}
.files .t{font-weight:600;line-height:1.3}
.files .t small{display:block;font:500 .74rem/1.5 var(--mono);color:var(--ink-2);margin-top:.15rem}
.files .t small .new{color:var(--green)}
.files a.dl{font-weight:600;font-size:.92rem;white-space:nowrap}
.more{display:inline-flex;gap:.5rem;align-items:center;font-weight:600;margin-top:.4rem}

details{border-top:1px solid var(--rule);padding:.2rem 0}
details:last-of-type{border-bottom:1px solid var(--rule)}
summary{cursor:pointer;font-weight:700;padding:.75rem 0;list-style:none;display:flex;justify-content:space-between;gap:1rem}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font:500 1.2rem/1 var(--mono);color:var(--green)}
details[open] summary::after{content:"–"}
details > div{padding-bottom:1rem}

.qgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem 1.5rem;margin:1rem 0}
.qgrid div{min-width:0}
.qgrid b{display:block;margin-bottom:.2rem}
.qgrid span{color:var(--ink-2);font-size:.95rem}

.steps{counter-reset:s;list-style:none;padding:0 !important}
.steps > li{counter-increment:s;position:relative;padding-left:2.4rem;margin:.9rem 0}
.steps > li::before{content:counter(s);position:absolute;left:0;top:-.15rem;font-family:var(--display);font-size:1.7rem;color:var(--green);line-height:1}

.calc{font-family:var(--mono);font-size:.9rem;background:var(--paper-2);padding:1rem 1.2rem;border-radius:3px;overflow-x:auto;margin:1rem 0}

/* closing */
.now{background:var(--ink);color:var(--paper)}
.now .wrap{display:grid;grid-template-columns:minmax(0,200px) minmax(0,var(--measure));gap:1rem 3.5rem;padding-block:4rem}
.now h2{font-family:var(--display);font-weight:400;font-size:clamp(2.4rem,5vw,3.4rem);line-height:.95;margin:0 0 1rem}
.now p{max-width:var(--measure)}
.now .calm{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:.6rem;margin:1.4rem 0;padding:0;list-style:none}
.now .calm li{border-top:2px solid var(--green);padding-top:.5rem;font-weight:600}
.now .calm li b{font-family:var(--display);font-weight:400;font-size:2rem;color:var(--green);display:block;line-height:1}
.now a{color:var(--green)}
.now .btn{background:var(--green);color:var(--green-ink)}
.copy{font-family:var(--mono);font-size:.9rem;user-select:all}

footer{padding-block:2rem;font-size:.85rem;color:var(--ink-2)}
footer .wrap{display:flex;flex-wrap:wrap;gap:.5rem 2rem;justify-content:space-between}

/* article pages */
.article .wrap{max-width:calc(var(--measure) + 80px)}
.article .head{padding-block:clamp(2.5rem,6vw,4rem) 1rem}
.article h1{font-size:clamp(3rem,9vw,5.6rem)}
.article .content{padding-bottom:3.5rem}
.article .content p,.article .content li{max-width:var(--measure)}
.back{font:500 .8rem var(--mono);text-decoration:none}
table.stack{border-collapse:collapse;width:100%;font-size:.95rem;margin:1rem 0}
table.stack th,table.stack td{text-align:left;padding:.6rem .8rem;border-bottom:1px solid var(--rule);vertical-align:top}
table.stack th{font:500 .72rem var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--ink-2);border-bottom-color:var(--ink)}
.tablewrap{overflow-x:auto}

@media (max-width:760px){
  .hero .wrap{grid-template-columns:1fr}
  .hero .cover{max-width:160px;order:-1;transform:rotate(2deg)}
  .chapter .wrap,.now .wrap{grid-template-columns:1fr;padding-block:2.5rem}
  .rail{display:flex;align-items:baseline;gap:1rem;flex-wrap:wrap}
  .rail .num{font-size:3.2rem}
  .rail .lbl,.rail .pages{margin-top:0}
  .files li{grid-template-columns:minmax(0,1fr) auto}
  .files .tag{grid-column:1/-1;justify-self:start}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
html{scroll-behavior:smooth}

/* where to start + home */
.readers .wrap{padding-block:1rem 4rem}
.readers ol{list-style:none;margin:0;padding:0;border-top:1px solid var(--ink)}
.readers li{display:grid;grid-template-columns:5rem minmax(0,1fr);gap:1rem 2rem;padding:1.4rem 0;border-bottom:1px solid var(--rule)}
.readers .n{font-family:var(--display);font-size:3.4rem;line-height:.85;color:var(--green)}
.readers h3{margin:.1rem 0 .3rem}
.readers p{margin:0 0 .4rem;max-width:var(--measure)}
.readers a{font-weight:600}
.readers .after{margin-top:1.6rem}
.quotes .wrap{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:1.5rem 3rem;padding-block:3.5rem}
.quotes blockquote{margin:0;font-size:1.05rem}
.quotes cite{display:block;margin-top:.6rem;font:500 .74rem/1.5 var(--mono);font-style:normal;color:var(--ink-2);text-transform:uppercase;letter-spacing:.04em}
.hero .buy + .buy{margin-top:.8rem}
@media (max-width:760px){.readers li{grid-template-columns:3rem minmax(0,1fr)}.readers .n{font-size:2.4rem}}