:root{color-scheme:dark;--bg:#282828;--fg:#ebdbb2;--muted:#bdae93;--accent:#fabd2f;--line:#504945;--panel:#32302f;--green:#b8bb26;--mono:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",monospace;--serif:Charter,"Bitstream Charter","Iowan Old Style",Georgia,serif}
:root[data-theme=light]{color-scheme:light;--bg:#fbf7ed;--fg:#3c3836;--muted:#685c51;--accent:#8f4808;--line:#d5c9b4;--panel:#f2ebdc;--green:#567019}
:root[data-theme=dark]{color-scheme:dark;--bg:#17191a;--fg:#e4e3dd;--muted:#a9ada9;--accent:#93c9bf;--line:#3d4141;--panel:#222627;--green:#a3bd88}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:2rem}body{margin:0;background:var(--bg);color:var(--fg);font:18px/1.75 var(--serif);-webkit-font-smoothing:antialiased}a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:4px}a:hover{text-decoration:underline;color:var(--fg)}a:focus-visible,button:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:5px}::selection{background:var(--accent);color:var(--bg)}.shell{width:min(100% - 48px,820px);margin:auto}header.site-header{display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line);padding:48px 0 25px}.wordmark{font:700 25px/1.2 var(--mono);letter-spacing:-1.2px;text-decoration:none;color:var(--fg)}.wordmark span{color:var(--accent)}nav{display:flex;gap:22px;flex-wrap:wrap}nav a{font:12px/1.6 var(--mono);letter-spacing:.07em;text-transform:uppercase;text-decoration:none;color:var(--muted)}nav a[aria-current=page]{color:var(--accent);text-decoration:underline;text-underline-offset:7px}main{min-height:65vh;padding:49px 0 64px}h1,h2,h3{font-family:var(--mono);font-weight:500;line-height:1.35;letter-spacing:-.055em}h1{font-size:34px;margin:0 0 10px}h2{font-size:23px;margin:0 0 23px}h3{font-size:18px;margin:28px 0 12px}p{margin:0 0 20px}section+section{margin-top:48px}.eyebrow,.meta,.section-index,.status,.small,.tag{font-family:var(--mono);font-size:12px;line-height:1.65}.eyebrow{color:var(--muted);letter-spacing:.08em;text-transform:uppercase;margin-bottom:14px}.subtitle{color:var(--muted);margin-bottom:28px}.intro{position:relative}.intro .portrait{float:right;width:108px;height:108px;object-fit:cover;border-radius:3px;margin:5px 0 20px 30px;filter:grayscale(1);border:1px solid var(--line)}.intro::after{content:"";display:table;clear:both}.intro p{max-width:760px}.intro-links{font:13px/1.8 var(--mono);display:flex;gap:23px;flex-wrap:wrap;margin-top:25px}.section-heading{display:flex;align-items:baseline;gap:15px}.section-index{color:var(--muted)}.section-heading h2{margin-bottom:18px}.rows{list-style:none;margin:0;padding:0}.rows li{border-top:1px solid var(--line);padding:17px 0}.rows li:last-child{border-bottom:1px solid var(--line)}.row-title{font:15px/1.5 var(--mono);text-decoration:none}.row-desc{color:var(--muted);font-size:16px;line-height:1.65;margin:5px 0 0}.meta{display:block;color:var(--muted);margin-bottom:5px}.row-top{display:flex;align-items:baseline;justify-content:space-between;gap:20px}.row-top .meta{white-space:nowrap;margin:0}.more{display:inline-block;font:12px/1.7 var(--mono);margin-top:19px;text-decoration:none}.note{border-left:2px solid var(--line);padding:3px 0 3px 20px;color:var(--muted)}.note p:last-child{margin-bottom:0}.project{margin-top:22px}.project p{font-size:17px}.project h3 a{text-decoration:none}.tags{display:flex;gap:14px;flex-wrap:wrap;margin-top:10px}.tag{color:var(--muted)}.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));gap:30px;margin-top:28px}.book{max-width:200px}.book-link{display:block;text-decoration:none}.book-cover{aspect-ratio:2/3;display:flex;flex-direction:column;justify-content:space-between;padding:23px 19px;color:#efe6cb;background:#534837;border:1px solid #796a51;border-left:7px solid #3c352a;box-shadow:5px 5px 0 var(--panel);transition:transform .18s ease}.book-link:hover .book-cover{transform:translateY(-4px)}.book-cover small{font:10px/1.5 var(--mono);letter-spacing:.07em;text-transform:uppercase}.book-cover strong{font:36px/1.15 var(--serif);font-weight:400}.book-cover .cover-rule{display:block;height:1px;background:#a4926f;margin-top:15px}.book-name{display:block;margin-top:17px;font:15px/1.5 var(--mono)}.book-author{font-size:14px;color:var(--muted);line-height:1.5;margin:7px 0 8px}.status{color:var(--green)}.status::before{content:"●";font-size:9px;margin-right:7px}.book-detail{display:grid;grid-template-columns:190px 1fr;gap:35px;margin-top:30px}.book-detail h2{margin-bottom:12px}.contact-list{margin:30px 0 0}.contact-list div{display:grid;grid-template-columns:110px 1fr;gap:20px;padding:18px 0;border-top:1px solid var(--line)}dt{font:13px/1.8 var(--mono);color:var(--muted)}dd{margin:0;overflow-wrap:anywhere}.site-footer{border-top:1px solid var(--line);padding:24px 0 36px;display:flex;gap:18px;justify-content:space-between;align-items:center;font:11px/1.8 var(--mono);color:var(--muted)}.footer-links{display:flex;gap:15px}.footer-links a{color:var(--muted);text-decoration:none}.theme-control{display:flex;align-items:center;gap:7px}.theme-control label{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}select{font:11px var(--mono);color:var(--fg);background:var(--panel);border:1px solid var(--line);border-radius:3px;padding:7px 8px;cursor:pointer}.skip-link{position:absolute;top:-80px;left:20px;padding:8px 16px;background:var(--bg);z-index:2}.skip-link:focus{top:10px}code{font: .85em var(--mono);overflow-wrap:anywhere}.back{font:12px var(--mono);display:inline-block;margin-bottom:30px}.page-intro{max-width:690px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:680px){body{font-size:17px}.shell{width:calc(100% - 36px)}header.site-header{align-items:flex-start;flex-direction:column;padding-top:28px;gap:20px}nav{gap:15px}nav a{font-size:11px}main{padding:34px 0 45px}h1{font-size:29px}h2{font-size:21px}.intro .portrait{width:78px;height:78px;margin-left:18px}.row-top{display:block}.row-top .meta{display:block;margin-bottom:4px}.site-footer{flex-wrap:wrap}.book-detail{grid-template-columns:1fr}.book-detail>.book-cover{width:165px}.contact-list div{grid-template-columns:80px 1fr;gap:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.book-cover{transition:none}}

/* Book covers adapt to each title and author. */
.book-cover strong{font-size:28px;overflow-wrap:anywhere}.book-cover{min-height:280px}.cover-deep-work{background:#31585a;border-color:#64888b;border-left-color:#244042}.cover-the-magic-of-thinking-big{background:#693a32;border-color:#966458;border-left-color:#4a2923}.cover-mastering-bitcoin{background:#71502e;border-color:#9b794d;border-left-color:#52391f}.cover-onboarding-to-bitcoin-core{background:#414e39;border-color:#6f7c5a;border-left-color:#2e3728}.muted{color:var(--muted)}

/* Long-form articles retain readable headings, lists, and serialized examples. */
.article-body{margin-top:32px}.article-body h2{margin:40px 0 18px}.article-body ul,.article-body ol{padding-left:25px;margin:0 0 24px}.article-body li{padding-left:4px;margin-bottom:9px}.article-body pre{max-width:100%;overflow-x:auto;padding:16px 18px;margin:22px 0;background:var(--panel);border:1px solid var(--line);border-radius:3px;line-height:1.7;tab-size:4}.article-body pre code{font-size:13px;overflow-wrap:normal;white-space:pre}.article-body a{overflow-wrap:anywhere}