:root{--paper:#f6f7f1;--surface:#fff;--ink:#14180f;--muted:#6a7061;--line:#d8dccf;--lime:#e0f65b;--soft:#edf1e3;--accent:#48620a;--danger:#af3628;--header:70px;color-scheme:light}
:root[data-theme=dark]{--paper:#171b14;--surface:#20271c;--ink:#f1f3e9;--muted:#b5bca9;--line:#3c4435;--soft:#2a3222;--accent:#d1e875;--danger:#ffa99b;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Avenir Next","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input{touch-action:manipulation}button{cursor:pointer;color:inherit}button{background:none}button:disabled{cursor:not-allowed}button,a,input,summary,[tabindex]{outline-offset:5px}button:focus-visible,a:focus-visible,input:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--accent)}input[type=checkbox]{accent-color:#587820;flex:none}svg{flex:none}h1,h2,h3,p{margin-top:0}button{border:0}button:hover,a:hover{transition:background .15s,color .15s,border-color .15s,transform .15s}.pixel-icon{width:27px;height:27px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linejoin:miter;stroke-linecap:square;shape-rendering:geometricPrecision}.eyebrow{font:600 10px/1.5 "SFMono-Regular",Consolas,monospace;letter-spacing:1.8px;text-transform:uppercase}.muted{color:var(--muted)}.small{font-size:12px}.text-link{font-size:13px;font-weight:600;border-bottom:1px solid currentColor;padding-bottom:4px;white-space:nowrap}.text-link:hover{color:var(--accent)}.button{min-height:48px;display:inline-flex;align-items:center;justify-content:center;gap:24px;padding:13px 22px;font-size:14px;font-weight:600;border:1.5px solid var(--ink);border-radius:2px}.button.dark{background:var(--ink);color:var(--paper)}.button.dark:hover{background:var(--accent);border-color:var(--accent);color:var(--paper)}.button.outline{background:transparent;color:var(--ink)}.button.outline:hover{background:var(--soft)}.button .pixel-icon{width:22px;height:22px}.icon-button{width:34px;height:34px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:50%;font-size:22px;flex:none}.icon-button:hover{background:var(--soft)}.skip{position:fixed;z-index:100;top:10px;left:10px;padding:12px 18px;background:var(--ink);color:var(--paper);transform:translateY(-180%)}.skip:focus{transform:none}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;clip:rect(0,0,0,0);overflow:hidden;white-space:nowrap;border:0}.site-header{height:var(--header);position:sticky;top:0;z-index:50;background:var(--paper);border-bottom:1px solid var(--line)}.header-inner{max-width:1440px;margin:auto;height:100%;display:flex;align-items:center;gap:25px;padding:0 32px}.brand{display:flex;gap:10px;align-items:center;white-space:nowrap;font-size:19px;font-weight:800;letter-spacing:-.5px}.brand svg{height:25px;width:25px;stroke:currentColor;fill:none;stroke-width:1.8}.brand b{font-size:16px;letter-spacing:0}.search-trigger{font-size:12px;color:var(--muted);display:flex;gap:8px;align-items:center;padding:8px 10px;border:1px solid var(--line);border-radius:4px;background:var(--surface)}.search-trigger>span{font-size:23px;line-height:1}.search-trigger kbd{font-size:10px;border:1px solid var(--line);border-radius:3px;padding:3px 4px;margin-left:18px;font-family:inherit}.top-nav{margin-left:auto;display:flex;align-self:stretch;gap:24px;align-items:center;font-size:12px;font-weight:600}.top-nav a{height:100%;display:flex;align-items:center;position:relative;white-space:nowrap}.top-nav a.active:after{content:"";position:absolute;bottom:13px;height:2px;left:0;right:0;background:var(--ink)}.top-nav a:hover{color:var(--accent)}#theme-toggle{font-size:18px;width:32px;height:26px;border-radius:15px}.home-shell{max-width:1376px;margin:auto;padding:24px 32px 0}.hero{border:1.5px solid #19220b;border-radius:6px;overflow:hidden;background:var(--lime);color:#10150c;box-shadow:0 16px 30px #1f301009}.hero-body{display:grid;grid-template-columns:1.15fr 1fr;position:relative;min-height:530px;padding:66px 68px 57px;gap:30px}.hero-copy{position:relative;z-index:2}.hero .eyebrow{margin-bottom:28px}.hero h1{font-size:67px;line-height:1.02;letter-spacing:-3.5px;font-weight:900;margin-bottom:24px}.hero h1 span{display:block;font-size:45px;line-height:1.26;letter-spacing:-1.5px;margin-top:10px}.hero-description{font-size:15px;line-height:1.85;font-weight:500;margin-bottom:30px}.hero-actions{display:flex;gap:14px;align-items:center}.hero .button{border-color:#11170c;color:#11170c;min-width:164px}.hero .button.dark{background:#11170c;color:#f8fbe9}.hero .button.dark:hover{background:#344713}.hero .button.outline:hover{background:#cde347}.hero-art{position:relative;min-width:0;min-height:400px}.paper{background:#fffef8;position:absolute;color:#14180f;box-shadow:6px 14px 15px #27350917}.paper-bag{width:166px;height:183px;top:0;left:24px;transform:rotate(-10deg);display:flex;align-items:center;justify-content:center;flex-direction:column;gap:14px;z-index:2}.paper-bag .pixel-icon{width:96px;height:96px;stroke-width:1.8}.paper-bag>span{font:700 8px monospace;letter-spacing:1.4px}.paper-order{width:266px;min-height:264px;left:140px;top:99px;transform:rotate(7deg);padding:27px 27px 32px;z-index:1}.paper-order:after{content:"";position:absolute;bottom:-9px;left:0;right:0;height:10px;background:linear-gradient(135deg,#fffef8 25%,transparent 25%) -5px 0/20px 20px,linear-gradient(225deg,#fffef8 25%,transparent 25%) -5px 0/20px 20px}.paper-order>span{font:700 9px monospace;letter-spacing:1.8px}.paper-order strong{display:block;font-size:76px;letter-spacing:-7px;line-height:1.5;white-space:nowrap}.paper-order strong span{font-size:55px;display:inline-block;margin:0 9px;vertical-align:5px;font-weight:500}.paper-order b{font-size:12px;display:block;margin-top:15px;letter-spacing:1px}.receipt-line{height:5px;background:#dde0d3;margin:9px 0;width:95%}.receipt-line.short{width:62%}.paper-chart{width:114px;height:115px;left:20px;top:249px;transform:rotate(-7deg);z-index:3;display:grid;place-items:center}.paper-chart .pixel-icon{width:72px;height:72px;stroke-width:2}.art-caption{position:absolute;bottom:-3px;right:0;font:700 9px monospace;letter-spacing:1.6px;white-space:nowrap}.art-cross{position:absolute;font:400 34px monospace}.cross-one{right:-5px;top:0}.cross-two{left:-15px;top:185px}.hero-strip{display:grid;grid-template-columns:repeat(4,1fr);background:#11170c;color:#fbfdeb;padding:25px 40px;gap:0}.hero-strip>div{display:flex;align-items:center;justify-content:center;gap:18px;border-right:1px solid #505842}.hero-strip>div:last-child{border:0}.hero-strip b{font:700 31px/1 monospace;color:var(--lime);letter-spacing:-2px}.hero-strip span{font-size:13px;font-weight:600}.hero-strip small{display:block;font:500 8px monospace;letter-spacing:1.2px;color:#d2e39d;margin-top:8px}.home-note{display:flex;justify-content:space-between;padding:19px 0 4px;font-size:12px;color:var(--muted);gap:15px;align-items:center}.home-note>span{display:flex;align-items:center;gap:8px}.home-note .pixel-icon{width:15px;height:15px}.home-note a{border-bottom:1px solid var(--line);padding-bottom:3px}.section{margin:64px 0}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:26px}.section-heading .eyebrow{margin-bottom:12px;color:var(--accent)}.section h2,.tools-banner h2{font-size:29px;letter-spacing:-1px;margin-bottom:12px;line-height:1.4}.section-heading p:not(.eyebrow){font-size:13px;color:var(--muted);margin:0}.section-index{font:500 10px monospace;letter-spacing:1px;color:var(--muted);margin-bottom:2px;white-space:nowrap}.path-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.path-card{border:1px solid var(--line);padding:24px 22px 19px;background:var(--surface);border-radius:4px;display:flex;flex-direction:column}.path-card:hover{border-color:var(--ink);transform:translateY(-3px);box-shadow:4px 4px 0 var(--line)}.card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:6px;min-height:59px}.card-top .eyebrow{font-size:8px;letter-spacing:1px;color:var(--muted);padding-top:6px}.card-top .pixel-icon{height:32px;width:32px}.path-card h3{font-size:21px;letter-spacing:-.6px;margin-bottom:12px}.path-card p{font-size:12px;line-height:1.85;color:var(--muted);min-height:44px;margin-bottom:23px}.card-bottom{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding-top:16px;margin-top:auto;font-size:11px}.card-bottom>span:last-child{font-size:22px;line-height:1}.question-grid{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line)}.question-grid>a{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:25px 24px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);font-size:14px;font-weight:600}.question-grid>a:hover{background:var(--soft)}.question-grid small{display:block;font:500 10px/1.5 "Avenir Next","PingFang SC",sans-serif;color:var(--muted);margin-top:9px}.question-grid>a>span:last-child{font-size:22px}.tools-banner{border:1px solid var(--line);background:var(--soft);padding:45px 52px;display:grid;grid-template-columns:1fr .75fr;gap:80px;border-radius:4px;margin:66px 0}.tools-banner .eyebrow{margin-bottom:15px}.tools-banner h2{font-size:34px;line-height:1.35}.tools-banner p:not(.eyebrow){font-size:13px;color:var(--muted);margin:16px 0 25px}.formula-poster{background:var(--surface);border:1px solid var(--line);padding:27px 32px;box-shadow:7px 7px 0 var(--line);transform:rotate(1deg);align-self:center}.formula-poster>div{display:flex;align-items:center;justify-content:space-between;font-size:12px;margin-bottom:14px}.formula-poster b{font:500 17px monospace}.formula-poster .formula-total{border-top:1px dashed var(--line);padding-top:19px;align-items:flex-start;flex-direction:column;gap:10px}.formula-total strong{font:700 45px/1 monospace;letter-spacing:-2px}.formula-poster>small{font-size:9px;color:var(--muted)}.chapter-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px 45px}.chapter-group>h3{font-size:13px;display:flex;align-items:center;gap:12px;border-bottom:2px solid var(--ink);padding-bottom:14px;margin-bottom:0}.chapter-group>h3 span{font:600 12px monospace;background:var(--lime);color:#11170c;padding:5px 7px}.chapter-row{display:grid;grid-template-columns:28px minmax(0,1fr) 20px;gap:12px;padding:18px 6px;border-bottom:1px solid var(--line);align-items:center}.chapter-row:hover{background:var(--soft)}.chapter-number{font:500 12px monospace;color:var(--muted);align-self:start;padding-top:3px}.chapter-row strong{font-size:13px;font-weight:600}.chapter-row small{display:block;font-size:11px;color:var(--muted);margin-top:6px;line-height:1.6}.read-dot{font-size:18px;text-align:center}.read-dot.done{color:var(--accent);font-size:15px}.closing{text-align:center;padding:40px 20px 64px}.closing h2{font-size:34px;letter-spacing:-1px;margin-bottom:12px}.closing p:not(.eyebrow){font-size:14px;color:var(--muted);margin-bottom:28px}.closing .text-link{display:table;margin:22px auto 0;font-size:12px}.site-footer{border-top:1px solid var(--line);max-width:1376px;padding:24px 32px 30px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:10px;color:var(--muted);line-height:1.8}.site-footer a{border-bottom:1px solid var(--line)}
/* Reader */
.reader-layout{max-width:1440px;margin:auto;display:grid;grid-template-columns:255px minmax(0,1fr) 205px;min-height:calc(100vh - var(--header))}.reader-sidebar{position:sticky;top:var(--header);height:calc(100vh - var(--header));overflow-y:auto;padding:30px 19px 26px 26px;border-right:1px solid var(--line);scrollbar-width:thin;background:var(--paper);font-size:12px}.sidebar-title{display:flex;align-items:center;justify-content:space-between;font-size:11px;color:var(--muted);margin-bottom:17px}.overview-link{display:flex;align-items:center;gap:8px;padding:11px 8px;border-radius:3px}.overview-link .pixel-icon{width:17px;height:17px}.current{background:var(--soft);color:var(--accent);font-weight:600}.sidebar-group{margin:20px 0}.sidebar-group h2{font-size:11px;font-weight:700;margin:0 0 9px;padding:0 9px}.sidebar-group a{display:flex;align-items:center;gap:9px;font-size:11px;line-height:1.5;padding:8px 8px;margin:2px 0;border-radius:3px}.sidebar-group a>span{font:500 10px monospace;color:var(--muted);width:15px;flex:none}.sidebar-group a i{margin-left:auto;font-style:normal;color:var(--accent);font-size:10px}.sidebar-group a:hover,.overview-link:hover{background:var(--soft)}.sidebar-tools{border-top:1px solid var(--line);padding-top:14px;margin-top:25px;display:grid;gap:4px}.sidebar-tools a{display:flex;gap:8px;align-items:center;font-size:11px;padding:8px}.sidebar-tools .pixel-icon{width:18px;height:18px}.progress-panel{margin-top:22px;background:var(--surface);border:1px solid var(--line);padding:14px;border-radius:3px}.progress-panel>div:first-child{display:flex;justify-content:space-between;font-size:10px}.progress-panel b{font:600 10px monospace}.progress-panel progress{width:100%;height:5px;border:0;display:block;margin:10px 0;background:var(--line);border-radius:4px}.progress-panel progress::-webkit-progress-bar{background:var(--line);border-radius:4px}.progress-panel progress::-webkit-progress-value{background:#788e23;border-radius:4px}.progress-panel small{font-size:9px;color:var(--muted)}.backup-actions{display:flex;gap:16px;margin-top:13px}.backup-actions button{padding:0;font-size:10px;color:var(--accent);border-bottom:1px solid var(--line)}.reader-center{min-width:0;border-right:1px solid var(--line)}.reader-toolbar{position:sticky;top:var(--header);z-index:20;display:flex;align-items:center;justify-content:space-between;gap:15px;padding:13px 36px;background:var(--paper);border-bottom:1px solid var(--line);min-height:48px;font-size:10px}.reader-breadcrumb{color:var(--muted)}.reader-shortcuts{display:flex;gap:22px}.reader-shortcuts a:hover{color:var(--accent)}.reader-article{padding:43px 40px 60px;max-width:870px;margin:auto}.reader-article>.eyebrow{color:var(--accent);margin-bottom:14px}.reader-article>h1{font-size:34px;line-height:1.4;letter-spacing:-1px;margin-bottom:16px;overflow-wrap:anywhere}.article-description{font-size:15px;line-height:1.8;color:var(--muted);margin-bottom:20px}.article-meta{display:flex;align-items:center;flex-wrap:wrap;gap:18px;font-size:9px;color:var(--muted);padding-bottom:26px;border-bottom:1px solid var(--line)}.article-meta a,.article-meta button{color:var(--accent);font-size:10px;padding:0}.article-progress{display:flex;align-items:center;gap:12px;font-size:10px;padding:13px 0;color:var(--muted)}.article-progress b{font:600 11px monospace;color:var(--ink)}.article-progress>span:last-child{margin-left:auto;font-size:9px}.prose{font-size:14px;line-height:1.95;overflow-wrap:anywhere}.prose p{margin:16px 0}.prose h2{font-size:22px;line-height:1.55;letter-spacing:-.5px;border-top:1px solid var(--line);padding-top:27px;margin:37px 0 18px;scroll-margin-top:130px}.prose h2:first-child{border-top:0;margin-top:10px;padding-top:12px}.prose h3{font-size:16px;line-height:1.65;margin:30px 0 14px;scroll-margin-top:130px}.prose h4{font-size:14px}.prose a:not(.anchor){color:var(--accent);text-decoration:underline;text-underline-offset:3px;word-break:break-word}.anchor{font-size:14px;opacity:0;margin-left:8px;color:var(--accent)}.prose h2:hover .anchor,.prose h3:hover .anchor,.anchor:focus{opacity:1}.prose ul,.prose ol{padding-left:22px;margin:16px 0}.prose li{padding-left:3px;margin:8px 0}.prose strong{font-weight:650}.prose code{font:11px/1.8 "SFMono-Regular",Consolas,monospace;background:var(--soft);padding:3px 5px;border-radius:3px}.prose pre{white-space:pre-wrap;padding:22px 24px;background:var(--soft);border:1px solid var(--line);border-radius:4px;overflow:auto}.prose pre code{padding:0;font-size:12px;line-height:1.85;background:transparent}.prose blockquote{border-left:3px solid var(--accent);background:var(--soft);margin:20px 0;padding:14px 20px;color:var(--muted)}.table-wrap{overflow:auto;max-width:100%;margin:23px 0 27px;border:1px solid var(--line);border-radius:3px;scrollbar-width:thin}.prose table{border-collapse:collapse;text-align:left;min-width:580px;width:100%;font-size:12px;line-height:1.85}.prose th{font-weight:650;background:var(--soft);white-space:nowrap}.prose th,.prose td{padding:13px 15px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);vertical-align:top}.prose th:last-child,.prose td:last-child{border-right:0}.prose tr:last-child td{border-bottom:0}.prose td{min-width:110px}.prose table:has(th:nth-child(5)){min-width:820px}.prose .checklist{padding:0;list-style:none;margin:20px 0;border:1px solid var(--line);border-radius:4px;background:var(--surface)}.prose .checklist li{padding:0;margin:0;border-bottom:1px solid var(--line)}.prose .checklist li:last-child{border:0}.checklist label{display:flex;align-items:flex-start;gap:12px;padding:13px 15px;cursor:pointer;font-size:12px;line-height:1.85}.checklist label:hover{background:var(--soft)}.checklist input{width:16px;height:16px;margin:3px 0 0}.checklist input:checked+span{color:var(--muted)}.chapter-finish{border-top:1px solid var(--line);margin:40px 0 28px;padding-top:24px;display:flex;align-items:flex-start;flex-direction:column;gap:12px}.chapter-finish small{font-size:10px;color:var(--muted)}.chapter-finish .button{font-size:12px;min-height:44px}.chapter-pagination{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:30px}.chapter-pagination a{border:1px solid var(--line);border-radius:4px;padding:16px}.chapter-pagination a:last-child{text-align:right}.chapter-pagination a:hover{border-color:var(--accent);background:var(--soft)}.chapter-pagination small{font-size:10px;color:var(--muted);display:block;margin-bottom:7px}.chapter-pagination strong{font-size:12px;line-height:1.7}.reader-toc{position:sticky;top:var(--header);height:calc(100vh - var(--header));overflow:auto;padding:38px 16px 24px 20px}.reader-toc>p{font-size:11px;font-weight:700;padding:0 10px;margin-bottom:15px}.reader-toc>a{display:block;border-left:1px solid var(--line);font-size:10px;line-height:1.6;padding:7px 10px;color:var(--muted)}.reader-toc>a:hover,.reader-toc>a.active{color:var(--accent);border-left-color:var(--accent);background:var(--soft)}.reader-toc .toc-source{border-left:0;margin-top:25px;color:var(--accent)}.mobile-only,.menu-button,.sidebar-backdrop{display:none}
/* Tools and library */
.utility-shell{max-width:1200px;padding:52px 32px 76px;margin:auto;min-height:calc(100vh - 160px)}.page-intro{margin-bottom:34px;max-width:900px}.page-intro .eyebrow{color:var(--accent);margin-bottom:18px}.page-intro h1{font-size:39px;line-height:1.4;letter-spacing:-1.5px;margin-bottom:17px}.page-intro>p:last-child{font-size:14px;color:var(--muted);line-height:1.85;max-width:800px}.tool-note{display:flex;align-items:center;gap:10px;background:var(--soft);border:1px solid var(--line);padding:17px 20px;border-radius:4px;font-size:12px;line-height:1.8;margin-bottom:25px}.tool-note .pixel-icon{width:21px;height:21px}.calculator-layout{display:grid;grid-template-columns:1.15fr 1fr;border:1px solid var(--line);border-radius:5px;overflow:hidden}.calculator-input{padding:30px;background:var(--surface)}.tool-section-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:23px}.tool-section-heading h2{font-size:15px;margin:0}.tool-section-heading>span{font-size:10px;color:var(--muted)}.scenario-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:13px}.scenario-tabs button{padding:8px 14px;font-size:11px;border:1px solid var(--line);border-radius:3px}.scenario-tabs button.active{background:var(--ink);color:var(--paper);border-color:var(--ink)}.input-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px 18px;margin-top:26px}.input-grid label{min-width:0;display:flex;flex-direction:column;gap:8px;font-size:11px}.input-grid input{border:1px solid var(--line);background:var(--paper);color:var(--ink);border-radius:3px;font:500 18px/1.5 monospace;width:100%;min-width:0;padding:9px 12px}.input-grid input:focus{border-color:var(--accent)}.full-width{grid-column:1/-1}.calculator-output{background:var(--soft);border-left:1px solid var(--line);padding:33px 30px;min-width:0}.calculator-output>.eyebrow{margin-bottom:28px}.main-result{display:flex;flex-direction:column;gap:12px;border-bottom:1px solid var(--line);padding-bottom:28px}.main-result>span{font-size:13px}.main-result strong{font:700 63px/1.1 "Avenir Next",monospace;letter-spacing:-3px;overflow-wrap:anywhere}.main-result small{font:500 12px monospace;color:var(--muted)}.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px 16px;margin:30px 0}.result-grid>div{min-width:0}.result-grid span{font-size:10px;line-height:1.7;display:block;margin-bottom:8px;color:var(--muted)}.result-grid strong{font:600 25px/1.5 monospace;letter-spacing:-1px;overflow-wrap:anywhere}.negative{color:var(--danger)}.result-status{padding:16px;background:var(--surface);border-left:3px solid var(--accent);font-size:12px;line-height:1.8}.result-status.warning,.result-warning{border-color:var(--danger);color:var(--danger)}.result-warning{background:var(--surface);padding:20px;border-left:3px solid;font-size:13px;line-height:1.8;margin-bottom:30px}.result-breakdown{display:flex;justify-content:space-between;gap:10px;font-size:10px;color:var(--muted);padding:12px 0 30px;flex-wrap:wrap}.calculator-output>.text-link{font-size:11px;white-space:normal}.tool-explanation{margin-top:42px}.tool-explanation h2{font-size:22px;margin-bottom:25px}.tool-explanation>div{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}.tool-explanation b{font-size:13px}.tool-explanation p{font-size:12px;line-height:1.85;color:var(--muted);margin-top:10px}.tool-explanation>.muted{border-top:1px solid var(--line);padding-top:20px;margin-top:24px}.diagnostic-layout{display:grid;grid-template-columns:320px minmax(0,1fr);gap:26px;margin:38px 0}.symptom-list{display:flex;flex-direction:column;gap:10px}.symptom-list button{display:flex;align-items:center;gap:12px;padding:21px 18px;font-size:13px;border:1px solid var(--line);background:var(--surface);text-align:left;border-radius:3px;line-height:1.6}.symptom-list button>span{font:500 11px monospace;color:var(--muted)}.symptom-list button>b{margin-left:auto;font-size:19px;font-weight:400}.symptom-list button.active{background:var(--lime);color:#11170c;border-color:#11170c}.symptom-list button.active>span{color:#4d5b21}.symptom-list button:hover{border-color:var(--ink)}#diagnostic-result{padding:35px 38px;border:1px solid var(--line);background:var(--surface);border-radius:4px}#diagnostic-result>.eyebrow{color:var(--accent);margin-bottom:17px}#diagnostic-result h2{font-size:26px;line-height:1.55;letter-spacing:-.5px;margin-bottom:23px}#diagnostic-result h3{font-size:13px;margin-bottom:10px}#diagnostic-result ol{padding-left:20px;font-size:13px;line-height:1.9}#diagnostic-result li{padding-left:5px;margin:10px 0}.next-action{background:var(--soft);padding:17px 19px;margin:22px 0 15px;border-left:3px solid var(--accent)}.next-action span{font-size:11px;color:var(--accent);font-weight:700}.next-action p{font-size:13px;line-height:1.85;margin:7px 0 0}#diagnostic-result>.muted{font-size:12px;line-height:1.8;margin-bottom:22px}.wide-link{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:24px;border:1px solid var(--line);border-top:0;font-size:14px;line-height:1.8}.wide-link:first-of-type{border-top:1px solid var(--line)}.wide-link>span{font-size:11px;color:var(--muted)}.wide-link:hover{background:var(--soft)}.library-actions{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:32px 0 26px}.filter-tabs{display:flex;gap:7px;flex-wrap:wrap}.filter-tabs button{font-size:12px;border:1px solid var(--line);padding:9px 16px;border-radius:3px}.filter-tabs button.active{background:var(--ink);color:var(--paper);border-color:var(--ink)}.resource-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.resource-card{padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:4px;display:flex;flex-direction:column;align-items:flex-start;position:relative;min-height:170px}.resource-card>.eyebrow{color:var(--muted);font-size:9px;margin-bottom:26px}.resource-card>.pixel-icon{position:absolute;right:24px;top:24px;height:23px;width:23px}.resource-card h2{font-size:17px;line-height:1.55;margin-bottom:24px}.resource-card-bottom{display:flex;justify-content:space-between;width:100%;margin-top:auto;font-size:10px;color:var(--muted)}.resource-card-bottom>b{font-size:19px;color:var(--ink)}.resource-card:hover{border-color:var(--ink);transform:translateY(-2px)}.backup-panel{border:1px solid var(--line);background:var(--soft);padding:28px;margin-top:36px;display:flex;justify-content:space-between;align-items:center;gap:25px}.backup-panel b{font-size:17px}.backup-panel p{font-size:11px;line-height:1.8;color:var(--muted);margin:10px 0 0;max-width:500px}.backup-panel>div:last-child{display:flex;gap:12px}.backup-panel .button{font-size:11px;white-space:nowrap;min-height:40px;padding:10px 15px}
/* Search */
#search-dialog{width:min(660px,calc(100vw - 32px));padding:0;border:1px solid var(--line);border-radius:8px;color:var(--ink);background:var(--surface);box-shadow:0 25px 100px #0004;max-height:80vh;top:12vh;margin:0 auto;overflow:hidden}#search-dialog::backdrop{background:#10150c70;backdrop-filter:blur(4px)}.search-box{padding:24px}.search-head{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:20px}.search-head h2{font-size:16px;margin:0}.search-head .icon-button{width:28px;height:28px;font-size:20px}#search-input{width:100%;padding:15px 16px;border:1px solid var(--line);border-radius:3px;font-size:14px;background:var(--paper);color:var(--ink)}#search-results{max-height:calc(80vh - 202px);overflow:auto;margin-top:12px;scrollbar-width:thin}.search-empty{font-size:12px;color:var(--muted);line-height:1.9;padding:15px 0}.search-count{font-size:10px;color:var(--muted);padding-top:7px}.search-result{display:block;border-top:1px solid var(--line);padding:15px 12px}.search-result:hover{background:var(--soft)}.search-result strong{font-size:14px;display:block;margin-bottom:6px}.search-result span{font-size:11px;line-height:1.8;display:block;color:var(--muted)}.search-result small{font:500 9px/1.7 monospace;color:var(--accent);display:block;overflow-wrap:anywhere;margin-top:7px}.search-hint{font-size:9px;color:var(--muted);margin:14px 0 0}#toast{position:fixed;left:50%;bottom:30px;transform:translate(-50%,12px);background:var(--ink);color:var(--paper);padding:14px 22px;border-radius:4px;font-size:12px;line-height:1.8;box-shadow:0 8px 30px #0002;z-index:120;opacity:0;pointer-events:none;max-width:calc(100vw - 32px);transition:opacity .2s,transform .2s}#toast.show{opacity:1;transform:translate(-50%,0)}.noscript{padding:30px}
@media(min-width:1400px){.hero-body{min-height:565px}.hero-art{transform:translateX(15px)}.hero h1{font-size:75px}.hero h1 span{font-size:49px}.paper-order{left:160px;top:104px}.paper-bag{left:32px}.paper-chart{left:30px;top:270px}}
@media(max-width:1199px){.header-inner{gap:20px;padding:0 24px}.search-trigger kbd{display:none}.top-nav{gap:18px}.hero-body{padding:50px 44px;grid-template-columns:1.1fr 1fr;gap:20px}.hero h1{font-size:59px}.hero h1 span{font-size:39px}.hero-art{transform:scale(.87);transform-origin:center center}.paper-order{left:104px}.paper-bag{left:4px}.paper-chart{left:0}.hero-description{font-size:14px}.hero-actions{gap:10px}.hero-actions .button{min-width:145px;padding:12px 16px}.path-grid{gap:12px}.path-card{padding:21px 17px 18px}.path-card h3{font-size:19px}.card-top{min-height:57px}.card-top .eyebrow{max-width:130px}.reader-layout{grid-template-columns:240px minmax(0,1fr)}.reader-toc{display:none}.reader-center{border-right:0}.tools-banner{gap:50px;padding:38px 40px}.question-grid>a{font-size:13px;padding:22px 18px}}
@media(max-width:959px){.brand{font-size:17px}.brand b{font-size:14px}.top-nav{gap:15px;font-size:11px}.search-trigger{font-size:0;gap:0;padding:5px 8px}.search-trigger>span{font-size:23px}.header-inner{gap:15px}.hero-body{grid-template-columns:1fr 320px;padding:42px 30px;gap:0;min-height:510px}.hero h1{font-size:54px}.hero h1 span{font-size:35px}.hero-art{transform:scale(.74);transform-origin:25% 40%}.hero-description{font-size:13px}.hero-actions .button{min-width:125px;font-size:12px;padding:11px 14px;gap:14px}.hero-strip{padding:23px 20px}.hero-strip>div{gap:12px}.hero-strip span{font-size:11px}.hero-strip b{font-size:27px}.hero-strip small{font-size:7px;letter-spacing:.7px}.path-grid{grid-template-columns:repeat(2,1fr);gap:15px}.path-card p{min-height:auto;max-width:290px}.card-top{min-height:48px}.question-grid{grid-template-columns:1fr 1fr}.tools-banner{gap:25px;padding:30px}.tools-banner h2{font-size:28px}.formula-poster{padding:25px}.reader-layout{grid-template-columns:220px minmax(0,1fr)}.reader-sidebar{padding:25px 14px}.reader-article{padding:35px 28px 50px}.reader-article>h1{font-size:29px}.reader-toolbar{padding:13px 26px}.reader-shortcuts{gap:15px}.calculator-layout{grid-template-columns:1fr 1fr}.calculator-input,.calculator-output{padding:25px 23px}.tool-section-heading{align-items:flex-start;flex-direction:column;gap:8px}.input-grid{gap:17px 12px}.result-grid{gap:20px 12px}.result-grid strong{font-size:22px}.diagnostic-layout{grid-template-columns:265px minmax(0,1fr);gap:20px}#diagnostic-result{padding:28px}#diagnostic-result h2{font-size:23px}.symptom-list button{font-size:12px;padding:18px 14px}.resource-grid{grid-template-columns:repeat(2,1fr)}.backup-panel{flex-direction:column;align-items:flex-start}.page-intro h1{font-size:34px}}
@media(max-width:759px){:root{--header:106px}.site-header{height:106px}.header-inner{height:60px;padding:0 19px;gap:13px}.brand{font-size:18px;margin-right:auto}.brand b{font-size:14px}.brand svg{width:22px;height:22px}.top-nav{position:absolute;top:59px;left:0;right:0;height:47px;border-top:1px solid var(--line);padding:0 20px;gap:0;justify-content:space-between;font-size:11px}.top-nav a.active:after{bottom:7px}.search-trigger{width:29px;height:29px;justify-content:center;background:none;border:0;padding:0}.home-shell{padding:18px 17px 0}.hero-body{display:block;padding:32px 27px 28px;min-height:auto}.hero h1{font-size:58px;letter-spacing:-3px}.hero h1 span{font-size:36px;letter-spacing:-1.3px;line-height:1.3;margin-top:11px}.hero .eyebrow{font-size:8px;letter-spacing:1.1px;margin-bottom:23px}.hero-description{font-size:13px;line-height:1.9;margin:22px 0 25px}.hero-actions .button{font-size:12px;min-width:0;min-height:44px;padding:10px 16px;gap:15px}.hero-art{height:242px;min-height:242px;margin-top:31px;transform:none;max-width:380px;margin-left:auto;margin-right:auto}.paper-bag{width:103px;height:119px;left:17px;top:3px;gap:6px}.paper-bag .pixel-icon{width:65px;height:65px}.paper-bag>span{font-size:5px;letter-spacing:.6px}.paper-order{width:169px;min-height:172px;left:132px;top:33px;padding:16px 18px}.paper-order>span{font-size:6px;letter-spacing:1px}.paper-order strong{font-size:48px;letter-spacing:-5px;line-height:1.5}.paper-order strong span{font-size:36px;margin:0 7px;vertical-align:3px}.paper-order b{font-size:8px;letter-spacing:.3px;margin-top:10px}.receipt-line{height:3px;margin:6px 0}.paper-chart{left:36px;top:143px;width:72px;height:70px}.paper-chart .pixel-icon{width:47px;height:47px}.cross-one{top:3px;right:13px;font-size:24px}.cross-two{top:118px;left:0;font-size:23px}.art-caption{font-size:6px;letter-spacing:1px;bottom:-5px;right:10px}.hero-strip{grid-template-columns:1fr 1fr;padding:20px 16px;gap:19px 0}.hero-strip>div{justify-content:flex-start;padding-left:22px;gap:15px}.hero-strip>div:nth-child(2){border:0}.hero-strip b{font-size:29px;min-width:33px}.hero-strip span{font-size:11px}.hero-strip small{font-size:6px;letter-spacing:.5px}.home-note{font-size:10px;flex-wrap:wrap;gap:12px;padding-top:18px}.home-note a{margin-left:22px}.section{margin:45px 0}.section-heading{gap:18px;margin-bottom:22px;align-items:flex-start;flex-direction:column}.section-index{display:none}.section-heading .eyebrow{font-size:9px;letter-spacing:1.3px;margin-bottom:11px}.section h2{font-size:25px;line-height:1.5;letter-spacing:-.7px;margin-bottom:10px}.section-heading p:not(.eyebrow){font-size:12px;line-height:1.8}.path-grid{gap:12px}.path-card{padding:18px 15px 15px}.card-top{min-height:49px;gap:5px}.card-top .eyebrow{font-size:7px;letter-spacing:.5px;line-height:1.9;max-width:100px}.card-top .pixel-icon{width:25px;height:25px}.path-card h3{font-size:18px;letter-spacing:-.5px}.path-card p{font-size:11px;line-height:1.8;margin-bottom:20px}.card-bottom{font-size:9px;padding-top:13px;gap:6px}.question-grid{grid-template-columns:1fr}.question-grid>a{padding:20px;font-size:13px}.question-grid small{font-size:10px}.tools-banner{display:block;padding:28px 25px;margin:46px 0}.tools-banner h2{font-size:30px}.tools-banner p:not(.eyebrow){line-height:1.8}.tools-banner .button{font-size:12px}.formula-poster{margin:32px 2px 7px;padding:25px 25px;max-width:360px}.formula-total strong{font-size:43px}.chapter-grid{grid-template-columns:1fr;gap:30px}.chapter-row{padding:16px 4px;gap:10px}.chapter-row strong{font-size:13px}.chapter-row small{font-size:10px}.closing{padding:10px 5px 43px}.closing h2{font-size:29px}.closing .eyebrow{font-size:8px;letter-spacing:.8px}.closing p:not(.eyebrow){font-size:12px}.site-footer{padding:22px 20px;display:block;font-size:9px}.site-footer>span{display:block;margin-bottom:10px}.reader-layout{display:block}.reader-toolbar{padding:12px 19px;gap:10px;min-height:47px;top:106px;font-size:10px}.reader-breadcrumb{display:none}.reader-shortcuts{gap:18px}.menu-button{display:flex;align-items:center;gap:9px;font-size:13px;padding:0}.menu-button span{font-size:11px}.mobile-only{display:inline-flex}.reader-sidebar{display:none;position:fixed;top:106px;left:0;bottom:0;height:calc(100dvh - 106px);width:min(300px,85vw);z-index:45;padding:20px 20px 28px;box-shadow:10px 0 40px #0002;border-right:1px solid var(--line)}.sidebar-title{margin-bottom:15px}.sidebar-group a{font-size:12px;padding:10px 9px}.sidebar-group h2{font-size:11px}.menu-open .reader-sidebar{display:block}.menu-open .sidebar-backdrop{display:block;position:fixed;inset:106px 0 0;background:#0005;z-index:40}.menu-open{overflow:hidden}.reader-article{padding:30px 21px 42px}.reader-article>h1{font-size:28px;line-height:1.45;margin-bottom:15px}.reader-article>.eyebrow{font-size:9px;letter-spacing:1.2px}.article-description{font-size:13px}.article-meta{gap:15px;padding-bottom:22px}.article-progress{font-size:9px;gap:9px}.article-progress>span:last-child{font-size:8px}.prose{font-size:13px;line-height:1.95}.prose h2{font-size:21px;padding-top:24px;margin-top:32px;scroll-margin-top:176px}.prose h3{font-size:15px;line-height:1.8;margin-top:26px;scroll-margin-top:176px}.prose th,.prose td{padding:12px}.prose table{font-size:11px}.table-wrap{margin:20px 0}.prose pre{padding:17px}.prose pre code{font-size:11px}.checklist label{font-size:12px;padding:13px 12px;gap:10px}.chapter-pagination{gap:10px}.chapter-pagination a{padding:14px 12px}.chapter-pagination strong{font-size:11px}.chapter-finish small{font-size:9px}.utility-shell{padding:32px 20px 50px}.page-intro{margin-bottom:26px}.page-intro h1{font-size:28px;line-height:1.5;letter-spacing:-.8px}.page-intro>p:last-child{font-size:12px;line-height:1.9}.page-intro .eyebrow{font-size:8px;letter-spacing:1px;margin-bottom:15px}.tool-note{font-size:10px;padding:14px;align-items:flex-start}.tool-note .pixel-icon{width:20px;height:20px;margin-top:3px}.calculator-layout{grid-template-columns:1fr}.calculator-input{padding:24px 20px}.calculator-output{border-left:0;border-top:1px solid var(--line);padding:26px 23px}.tool-section-heading{flex-direction:row}.tool-section-heading h2{font-size:13px}.tool-section-heading>span{font-size:9px}.scenario-tabs button{font-size:10px;padding:8px 12px}.input-grid label{font-size:10px}.input-grid input{font-size:19px;padding:10px}.main-result strong{font-size:63px}.result-grid strong{font-size:27px}.result-grid{gap:26px 20px}.result-grid span{font-size:10px}.tool-explanation>div{grid-template-columns:1fr;gap:13px}.tool-explanation h2{font-size:22px}.tool-explanation>div p{margin-bottom:10px}.diagnostic-layout{grid-template-columns:1fr;margin-top:26px;gap:22px}.symptom-list{display:grid;grid-template-columns:1fr 1fr;gap:10px}.symptom-list button{padding:13px 10px;font-size:11px;gap:7px;align-items:flex-start}.symptom-list button>b{display:none}.symptom-list button>span{font-size:9px;padding-top:3px}.symptom-list button.active{box-shadow:2px 2px 0 var(--ink)}#diagnostic-result{padding:27px 23px}#diagnostic-result h2{font-size:23px}#diagnostic-result ol{font-size:12px}#diagnostic-result>.muted{font-size:11px}#diagnostic-result .button{font-size:12px}.wide-link{padding:18px;align-items:flex-start;flex-direction:column;gap:6px;font-size:13px}.wide-link>span{font-size:10px}.library-actions{flex-direction:column;align-items:flex-start;gap:20px;margin:27px 0 22px}.filter-tabs{gap:7px}.filter-tabs button{font-size:10px;padding:8px 11px}.library-actions>.text-link{font-size:11px}.resource-grid{grid-template-columns:1fr 1fr;gap:12px}.resource-card{padding:19px 15px;min-height:170px}.resource-card>.eyebrow{font-size:8px;letter-spacing:.5px}.resource-card>.pixel-icon{width:20px;height:20px;top:18px;right:14px}.resource-card h2{font-size:14px;line-height:1.75;margin-bottom:19px}.resource-card-bottom{font-size:8px;gap:6px;line-height:1.8}.backup-panel{padding:24px 20px;margin-top:27px;gap:19px}.backup-panel b{font-size:16px}.backup-panel p{font-size:11px}.backup-panel>div:last-child{gap:10px}.backup-panel .button{font-size:10px}.search-box{padding:19px}#search-dialog{top:8vh;max-height:85vh}.search-head h2{font-size:14px}#search-input{font-size:13px;padding:13px}#search-results{max-height:calc(85vh - 202px)}#toast{font-size:11px;bottom:20px;min-width:240px;text-align:center}}
@media(max-width:379px){.hero-body{padding:29px 21px 24px}.hero h1{font-size:53px}.hero h1 span{font-size:31px}.hero-description{font-size:12px}.hero-art{transform:scale(.9);transform-origin:10% 50%;margin-top:20px;margin-bottom:-10px}.paper-order{left:111px}.hero-actions .button{font-size:11px;padding:10px 13px;gap:12px}.hero-strip>div{padding-left:13px}.hero-strip b{font-size:25px}.path-card{padding:16px 12px}.path-card h3{font-size:17px}.brand{font-size:16px}.brand b{font-size:13px}.header-inner{padding:0 15px;gap:10px}.resource-grid{grid-template-columns:1fr}.article-progress>span:last-child{display:none}.tool-section-heading{flex-direction:column}.page-intro h1{font-size:26px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
@media print{.site-header,.reader-sidebar,.reader-toolbar,.reader-toc,.site-footer,.article-meta button,.chapter-finish,.chapter-pagination,.article-progress,.skip,#toast{display:none!important}.reader-layout{display:block}.reader-center{border:0}.reader-article{padding:0;max-width:none}.prose{font-size:10pt;color:#000}.prose h2{break-after:avoid}.table-wrap{overflow:visible;border:0}.prose table,.prose table:has(th:nth-child(5)){min-width:0;width:100%;font-size:8pt}.prose th,.prose td{padding:5px;min-width:0}.checklist label{font-size:10pt}.prose pre{white-space:pre-wrap}body{background:white;color:black}.anchor{display:none}.article-meta{font-size:8pt}.reader-article>h1{font-size:24pt}a{color:black!important}.prose p,.prose li{orphans:3;widows:3}}

@media print{:root,:root[data-theme=dark]{--paper:#fff;--surface:#fff;--ink:#000;--muted:#444;--line:#ccc;--soft:#f3f3f3;--accent:#000}}