:root{--ink:#292724;--muted:#77716a;--line:#e7e4df;--link:#2f7282;--linkHover:#174d5a;--soft:#f7f5f1;--paper:#fff;--spine:58px;--max:790px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--soft);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}button,input{font:inherit}a{color:var(--link);text-decoration:none}a:hover{color:var(--linkHover)}
.top{height:56px;position:sticky;top:0;z-index:50;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:18px;padding:0 18px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.96);backdrop-filter:blur(12px)}
.brand{display:flex;align-items:center;gap:9px;color:var(--ink);font-weight:690;letter-spacing:.01em}.brand:hover{color:var(--ink)}.mark{width:23px;height:23px;border:1.5px solid #4c4a46;border-radius:6px;position:relative}.mark:before,.mark:after{content:"";position:absolute;top:4px;bottom:4px;width:1px;background:#aaa49c}.mark:before{left:7px}.mark:after{left:14px}.tagline{font-size:12px;color:var(--muted);font-weight:500;margin-left:2px}
.nav{justify-self:end;display:flex;align-items:center;gap:5px}.nav a,.nav button{border:0;background:transparent;color:#5e5a54;padding:7px 9px;border-radius:7px;font-size:13px}.nav a:hover,.nav button:hover{background:#f4f2ee;color:var(--ink)}.nav .product{border:1px solid #cfdcdf;background:#f7fbfc;color:#245d69;font-weight:650}
.workspace{min-height:calc(100vh - 56px);display:flex;justify-content:center}.history-spines{display:flex;flex:0 0 auto;background:#faf9f7}.spine{width:var(--spine);border-right:1px solid var(--line);position:relative;background:#faf9f7}.spine a{position:absolute;inset:0;display:flex;align-items:flex-start;justify-content:center;padding:16px 0;color:#6f6961}.spine span{writing-mode:vertical-rl;transform:rotate(180deg);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-height:calc(100vh - 100px);font:500 13px/1.2 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.spine:hover{background:#f4f2ee}.spine:hover a{color:var(--link)}
.page{width:min(100%,980px);min-width:0;min-height:calc(100vh - 56px);background:var(--paper);border-right:1px solid var(--line);box-shadow:0 0 0 1px rgba(0,0,0,.008)}.inner{width:min(100%,var(--max));margin:0 auto;padding:52px 28px 86px}.crumbs{font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:#8a847d;margin-bottom:12px}.crumbs a{color:#817b74}.title{font:500 clamp(34px,5vw,48px)/1.08 Georgia,"Times New Roman",serif;letter-spacing:-.025em;margin:0 0 12px}.deck{font:17px/1.55 Georgia,"Times New Roman",serif;color:#666057;margin:0 0 26px}.meta{display:flex;flex-wrap:wrap;gap:7px;margin:0 0 30px}.chip{font-size:11px;background:#f4f2ee;border:1px solid #e8e4dd;border-radius:999px;padding:4px 8px;color:#6a645d}
.body{font:18px/1.72 Georgia,"Times New Roman",serif;overflow-wrap:anywhere}.body p{margin:0 0 1.12em}.body h2,.body h3,.body h4{font-family:Georgia,"Times New Roman",serif;line-height:1.18;scroll-margin-top:78px}.body h2{font-size:29px;margin:2em 0 .75em}.body h3{font-size:23px;margin:1.7em 0 .65em}.body h4{font-size:19px;margin:1.5em 0 .55em}.body ul,.body ol{padding-left:1.4em}.body li{margin:.22em 0}.body blockquote{margin:1.4em 0;padding:.1em 0 .1em 18px;border-left:3px solid #cfd8d9;color:#55504a}.body img{display:block;max-width:100%;height:auto;margin:26px auto;border-radius:4px}.body table{width:100%;border-collapse:collapse;margin:1.4em 0;font:15px/1.45 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.body th,.body td{border:1px solid #ddd9d2;padding:8px 10px;vertical-align:top;text-align:left}.body th{background:#f7f5f1;font-weight:650}.body table{display:block;overflow-x:auto}.body code{font:14px ui-monospace,SFMono-Regular,Menlo,monospace;background:#f4f2ee;padding:.12em .3em;border-radius:4px}.body pre{overflow:auto;background:#252525;color:#f5f4f2;padding:14px 16px;border-radius:8px}.body pre code{background:transparent;color:inherit;padding:0}.body hr{border:0;border-top:1px solid var(--line);margin:2em 0}.body a{font-weight:500}.body sup a{font-weight:600}.fold-heading{cursor:pointer;position:relative;padding-left:20px}.fold-heading:before{content:"▾";font:11px -apple-system,BlinkMacSystemFont,"Segoe UI";position:absolute;left:0;top:.55em;color:#aaa39a;transition:transform .12s}.fold-heading.folded:before{transform:rotate(-90deg)}.fold-hidden{display:none!important}
.links{margin-top:48px;padding-top:20px;border-top:1px solid var(--line)}.links h2{font:500 19px Georgia,"Times New Roman",serif;margin:0 0 12px}.backlink{display:block;padding:5px 0;font-size:14px}.note-footer{margin-top:48px;padding-top:22px;border-top:1px solid var(--line);font-size:12px;line-height:1.6;color:#858079}.note-footer a{color:#67625c}.app-strip{margin:44px 0 0;padding:18px 20px;border:1px solid #dae4e5;background:#f8fbfb;border-radius:10px}.app-strip strong{font:600 18px Georgia,"Times New Roman",serif}.app-strip p{margin:5px 0 0;color:#65615b;font-size:13px;line-height:1.5}.app-strip a{font-weight:650}
.search-backdrop{display:none;position:fixed;inset:0;background:rgba(30,28,25,.2);z-index:79}.search-backdrop.open{display:block}.search{position:fixed;z-index:80;top:70px;left:50%;transform:translateX(-50%) scale(.985);width:min(680px,calc(100vw - 24px));max-height:min(720px,calc(100vh - 90px));background:white;border:1px solid var(--line);border-radius:12px;box-shadow:0 22px 70px rgba(30,28,25,.16);opacity:0;pointer-events:none;transition:.12s;overflow:hidden}.search.open{opacity:1;pointer-events:auto;transform:translateX(-50%) scale(1)}.search-head{padding:12px;border-bottom:1px solid var(--line)}.search input{width:100%;border:0;outline:0;background:#f6f4f1;border-radius:8px;padding:12px 13px;font-size:16px}.results{max-height:610px;overflow:auto;padding:7px}.result{display:block;padding:10px 11px;border-radius:7px;color:var(--ink)}.result:hover{background:#f6f4f1}.result strong{display:block;font-size:14px}.result small{display:block;color:var(--muted);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.hero-note{padding:2px 0 12px}.hero-note .eyebrow{color:var(--link);font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.hero-note h1{font:500 clamp(40px,7vw,65px)/1.02 Georgia,"Times New Roman",serif;letter-spacing:-.035em;margin:12px 0 15px}.hero-note p{font:19px/1.55 Georgia,"Times New Roman",serif;color:#655f57;max-width:680px}.home-actions{display:flex;gap:8px;flex-wrap:wrap;margin:23px 0 38px}.btn{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:8px;padding:9px 12px;background:white;color:var(--ink);font-size:13px;font-weight:650}.btn.primary{background:#2f7282;color:white;border-color:#2f7282}.btn:hover{filter:brightness(.97)}.free-note{font-size:12px;color:var(--muted);margin-top:12px}.topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin:14px 0 34px}.topic-card{display:block;padding:14px;border:1px solid var(--line);border-radius:9px;background:#fff;color:var(--ink)}.topic-card:hover{border-color:#cbd8d9;background:#fbfcfc}.topic-card strong{display:block;font:600 16px Georgia,"Times New Roman",serif}.topic-card small{display:block;color:var(--muted);margin-top:4px}
.product-hero{padding:8px 0 20px}.product-kicker{font-size:12px;color:var(--link);font-weight:700;letter-spacing:.08em;text-transform:uppercase}.product-hero h1{font:500 clamp(42px,7vw,66px)/1.02 Georgia,"Times New Roman",serif;letter-spacing:-.04em;margin:12px 0}.product-hero .lead{font:20px/1.55 Georgia,"Times New Roman",serif;color:#625d55;max-width:680px}.store-row{display:flex;gap:10px;flex-wrap:wrap;margin:26px 0}.store-badge{border:1px solid #252525;border-radius:9px;padding:9px 13px;color:#252525;background:#fff;font-size:13px;font-weight:650}.store-badge.disabled{opacity:.58;cursor:default}.feature-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin:22px 0 36px}.feature{border:1px solid var(--line);border-radius:9px;padding:15px}.feature strong{font:600 16px Georgia,"Times New Roman",serif}.feature p{font-size:13px;color:#6c665f;margin:6px 0 0;line-height:1.5}.compare{width:100%;border-collapse:collapse;font-size:14px}.compare td,.compare th{border-bottom:1px solid var(--line);padding:9px;text-align:left}.compare th:last-child,.compare td:last-child{text-align:center}
@media(max-width:799px){.tagline{display:none}.top{grid-template-columns:auto minmax(0,1fr);padding:0 11px}.top>div:empty{display:none}.nav a:not(.product){display:none}.nav{justify-self:end;min-width:0;gap:2px;flex-wrap:nowrap}.nav button,.nav .product{white-space:nowrap}.nav .product{display:block!important}.workspace{display:block}.history-spines{flex-direction:column;width:100%}.spine{width:100%;height:38px;border-right:0;border-bottom:1px solid var(--line)}.spine a{position:static;width:100%;height:100%;display:block;padding:0 15px;line-height:38px}.spine span{writing-mode:horizontal-tb;transform:none;display:block;max-height:none;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.page{width:100%;border-right:0}.inner{padding:34px 18px 65px}.title{font-size:34px}.body{font-size:17px;line-height:1.68}.topic-grid,.feature-grid{grid-template-columns:1fr}.search{top:62px}.body h2{font-size:26px}}
@media(max-width:360px){.top{padding:0 8px}.brand{gap:7px}.nav button{padding:7px 5px;font-size:12px}.nav .product{padding:7px 7px;font-size:12px}}
@media print{.top,.history-spines,.app-strip,.search,.search-backdrop{display:none!important}.workspace{display:block}.page{border:0;width:100%;box-shadow:none}.inner{width:100%;max-width:none;padding:0}.body{font-size:11pt}.title{font-size:26pt}a{color:inherit;text-decoration:none}.fold-heading{padding-left:0}.fold-heading:before{display:none}}