@font-face {
  font-family: 'DM Sans';
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
  src: url(/assets/fonts/font-1.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Instrument Serif';
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url(/assets/fonts/font-2.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Instrument Serif';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(/assets/fonts/font-3.woff2) format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
:root{--bg:#f8faff;--surface:#fff;--ink:#15233b;--muted:#526079;--line:#d5deee;--accent:#164fe5;--soft:#edf2ff;--lime:#ddf99b;--shadow:0 18px 55px #112e6310;color-scheme:light;font-family:'DM Sans',system-ui,sans-serif;font-size:16px;font-synthesis:none}
:root[data-theme=dark]{--bg:#101823;--surface:#162232;--ink:#f0f4ff;--muted:#b5c2d8;--line:#34445a;--accent:#98b8ff;--soft:#202f47;--lime:#d5ef9a;--shadow:0 18px 55px #0002;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--bg);color:var(--ink);line-height:1.65}a{color:inherit;text-underline-offset:4px}a:hover{color:var(--accent)}button,input,select,textarea{font:inherit}button,a,input,select{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}input,select{min-width:0}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:4px}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.12;font-weight:500;letter-spacing:-.045em}h1{font-size:clamp(2.8rem,6.3vw,6rem);margin-bottom:1.35rem}h2{font-size:clamp(1.9rem,3.3vw,3rem)}h3{font-size:1.5rem}em{font-family:'Instrument Serif',Georgia,serif;font-weight:400}img{max-width:100%;height:auto}button{border:0}small,.small{font-size:.875rem;color:var(--muted)}.wrap{width:min(1240px,calc(100% - 80px));margin:auto}.narrow{max-width:850px}.section{padding-block:80px}.eyebrow{display:block;font-size:.75rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;margin-bottom:16px;color:var(--muted)}.accent{color:var(--accent)}.lede{font-size:1.25rem;line-height:1.6;max-width:660px;color:var(--muted);letter-spacing:-.015em}.site-header{height:90px;padding:0 max(40px,calc((100vw - 1240px)/2));display:flex;align-items:center;gap:32px;border-bottom:1px solid var(--line);background:var(--bg)}.wordmark{font-size:1.25rem;letter-spacing:-.05em;font-weight:700;text-decoration:none;display:inline-flex;gap:10px;align-items:center;white-space:nowrap}.brand-mark{display:flex;align-items:center;position:relative;justify-content:center;background:var(--accent);color:var(--bg);height:34px;width:34px;border-radius:8px;font-size:1.4rem;line-height:1}.brand-mark span{position:absolute;font-size:.75rem;right:2px;top:2px}.site-header nav{display:flex;gap:28px;margin-left:auto}.site-header nav a{text-decoration:none;font-size:.9375rem;font-weight:500}.theme-toggle{display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--line);color:var(--ink);border-radius:30px;padding:8px 12px;font-size:1.2rem;min-height:44px}.theme-label{font-size:.75rem}.home-intro{display:grid;grid-template-columns:1.5fr 1fr;gap:9%;padding-block:88px 76px;align-items:center}.home-intro .lede{max-width:560px}.button{display:inline-flex;align-items:center;justify-content:center;gap:20px;padding:13px 22px;border-radius:8px;background:var(--accent);color:var(--bg);font-weight:600;font-size:.9375rem;text-decoration:none;border:1px solid transparent;min-height:48px;line-height:1.4}.button:hover{filter:brightness(.92);color:var(--bg)}.button.secondary{background:var(--surface);border-color:var(--line);color:var(--ink)}.button.light{background:#fff;color:#164fe5}.under-button{display:block;font-size:.8125rem;margin-top:12px;color:var(--muted)}.home-note{background:var(--surface);border:1px solid var(--line);border-top:5px solid var(--accent);padding:32px 36px 24px;box-shadow:var(--shadow);transform:rotate(2deg);border-radius:4px 4px 16px 4px}.home-note .eyebrow{margin-bottom:26px}.note-date{font-size:.75rem;font-weight:600;letter-spacing:.08em;color:var(--muted)}.hand-note{font-family:'Instrument Serif',Georgia,serif;font-size:2.1rem;line-height:1.22;margin:20px 0 30px}.note-rule{height:1px;background:var(--line);margin-bottom:22px}.home-note p:not(.hand-note){font-size:.9375rem}.home-note small{font-size:.75rem}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:28px}.section-heading h2{max-width:710px;margin-bottom:0}.section-heading a{font-size:.9375rem;white-space:nowrap}.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.topic-card{border:1px solid var(--line);padding:28px 28px 22px;border-radius:12px;text-decoration:none;background:var(--surface);display:flex;flex-direction:column;transition:border-color .2s,transform .2s;min-height:220px}.topic-card:hover{border-color:var(--accent);transform:translateY(-3px);color:var(--ink)}.topic-card h3{display:flex;justify-content:space-between;gap:14px}.topic-card h3 span{font-size:1.2rem;color:var(--accent)}.topic-card p{font-size:1rem;color:var(--muted);margin-bottom:24px}.card-bottom{font-size:.75rem;color:var(--muted);margin-top:auto;display:block;padding-top:14px;border-top:1px solid var(--line)}.category-strip{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.category-strip a{border-radius:30px;border:1px solid var(--line);padding:8px 15px;font-size:.875rem;text-decoration:none}.blue-band{background:#164fe5;color:#fff;padding-block:66px}.band-grid{display:grid;grid-template-columns:1fr 2fr;gap:40px}.band-grid .eyebrow{color:#dbe5ff}.band-grid h2{font-size:clamp(2.5rem,4vw,4rem);max-width:600px}.band-grid p{font-size:1.15rem;max-width:600px;color:#e7edff}.article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}.article-card{display:block;text-decoration:none}.article-card img{aspect-ratio:3/2;object-fit:cover;border-radius:10px;background:var(--soft);width:100%}.article-card>div{padding-top:22px}.article-card h3{font-size:1.65rem;line-height:1.18}.article-card p{color:var(--muted);font-size:.9375rem}.principles{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;border-top:1px solid var(--line)}.number{font-family:'Instrument Serif',Georgia,serif;font-size:2rem;color:var(--accent);display:block;margin-bottom:20px}.principles p{color:var(--muted)}footer{border-top:1px solid var(--line);padding:50px max(40px,calc((100vw - 1240px)/2)) 24px;background:var(--surface)}.footer-top{display:flex;justify-content:space-between;gap:30px}.footer-top .wordmark{align-self:start;font-size:1.7rem}.plus{color:var(--accent)}.footer-top p{font-size:1.3rem;letter-spacing:-.03em}.footer-links{display:flex;gap:22px;flex-wrap:wrap;margin:25px 0 40px;font-size:.875rem}.footer-small{display:flex;justify-content:space-between;gap:40px;border-top:1px solid var(--line);padding-top:22px;color:var(--muted);font-size:.75rem}.footer-small p{max-width:650px}.text-button{padding:0;background:none;color:inherit;text-decoration:underline;text-underline-offset:4px;font-size:inherit;min-height:32px}.danger{color:var(--muted)}.search-label{display:block;margin-block:28px 50px;max-width:540px;font-size:.875rem;font-weight:600}.search-label input{display:block;margin-top:8px;width:100%;padding:15px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink)}.tool-group{margin-bottom:60px;scroll-margin-top:30px}.tool-group h2{font-size:1.7rem}.apps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:48px}.app-card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:28px;display:flex;flex-direction:column;gap:18px}.app-card .eyebrow{margin:0}.app-card h2{font-size:1.5rem;margin:0;line-height:1.2}.app-card p{color:var(--muted);margin:0}.app-card .button{margin-top:auto}.app-card>a:not(.button){font-size:.875rem}.app-icon{width:56px;height:56px;object-fit:cover;border-radius:13px;background:var(--soft)}.breadcrumbs{display:flex;gap:12px;font-size:.875rem;color:var(--muted);padding-block:30px}.topic-heading{display:flex;justify-content:space-between;align-items:center;gap:30px;margin-block:20px 30px}.topic-heading h1{font-size:clamp(2.6rem,5vw,4.6rem)}.topic-heading .app-icon{width:100px;height:100px;border-radius:24px;margin-right:20px}.notice{border-left:3px solid var(--accent);padding:20px 24px;background:var(--soft);margin-bottom:30px;border-radius:0 8px 8px 0}.notice p{margin:6px 0 0;max-width:1000px}.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:40px;align-items:start;margin-bottom:50px}.log-tool{border:1px solid var(--line);background:var(--surface);border-radius:14px;padding:30px;min-width:0}.tool-top{display:flex;justify-content:space-between;align-items:start;gap:16px}.tool-top h2{font-size:2rem}.tool-top .eyebrow{margin-bottom:8px}.privacy-chip{font-size:.75rem;background:var(--soft);color:var(--muted);padding:6px 10px;border-radius:20px}.entry-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-block:24px}.entry-form label{font-size:.875rem;font-weight:500}.entry-form input,.entry-form select{width:100%;display:block;border:1px solid var(--line);border-radius:7px;padding:11px 12px;background:var(--bg);color:var(--ink);margin-top:7px;min-height:48px}.entry-form button{align-self:end}.table-wrap{overflow-x:auto;width:100%;margin-top:25px}table{border-collapse:collapse;font-size:.8125rem;width:100%;text-align:left}th{font-weight:600;color:var(--muted);background:var(--soft)}th,td{padding:12px;border-bottom:1px solid var(--line);vertical-align:top;min-width:100px;overflow-wrap:anywhere}.empty-row td{padding:26px 15px;text-align:center;color:var(--muted)}.tool-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center;margin-block:25px}.text-link{font-size:.875rem}.save-option{display:flex;gap:10px;align-items:center;margin-bottom:10px;font-weight:500;font-size:.9375rem}.save-option input{width:20px;height:20px;accent-color:var(--accent)}.tool-aside{padding:16px 0}.tool-aside h2{font-size:1.65rem}.tool-aside ol{padding-left:22px}.tool-aside li{margin-bottom:18px;padding-left:5px;color:var(--muted)}.reading-link{display:block;border-block:1px solid var(--line);padding-block:24px;margin-block:24px;text-decoration:none}.reading-link h3{font-size:1.25rem;line-height:1.3}.reading-link>span:last-child{color:var(--accent);font-size:.875rem}.app-cta{background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:28px;display:flex;align-items:center;gap:24px;flex-wrap:wrap}.app-identity{display:flex;gap:18px;align-items:center;flex:1;min-width:250px}.app-identity .app-icon{flex:none}.app-identity h3{margin-bottom:8px;font-size:1.3rem}.app-identity p{margin-bottom:0;color:var(--muted);font-size:.9375rem}.app-identity .eyebrow{margin-bottom:8px}.app-cta small{flex-basis:100%;font-size:.75rem;margin-top:-8px}.article-shell{padding-bottom:30px}.article-header{max-width:940px;margin:35px auto}.article-header h1{font-size:clamp(2.7rem,4.6vw,4.6rem);line-height:1.06}.article-header .lede{max-width:800px}.byline{color:var(--muted);font-size:.8125rem}.featured{margin:36px 0 55px}.featured img{display:block;width:100%;aspect-ratio:2.3;object-fit:cover;border-radius:12px}.featured figcaption{font-size:.75rem;color:var(--muted);margin-top:8px;text-align:right}.article-layout{display:grid;grid-template-columns:230px minmax(0,740px);gap:65px;justify-content:center}.contents{display:flex;flex-direction:column;gap:15px;align-self:start;position:sticky;top:25px;font-size:.875rem}.contents a{text-decoration:none}.contents .button{margin-top:15px;font-size:.875rem}.prose{font-size:1.0625rem;line-height:1.85}.prose h2{font-size:2rem;line-height:1.2;margin-top:48px;margin-bottom:20px;letter-spacing:-.03em}.prose h3{font-size:1.35rem}.prose p{margin-bottom:22px}.prose a{color:var(--accent)}.prose .button{color:var(--bg)}.prose .button.secondary{color:var(--ink)}.prose li{margin-bottom:12px}.prose .answer{border-left:3px solid var(--accent);padding:20px 26px;background:var(--soft);border-radius:0 10px 10px 0}.answer p{margin-bottom:0}.worked-example{padding:24px;border:1px solid var(--line);border-radius:8px;background:var(--surface);margin-block:25px}.worked-example p{margin:0}.free-tool-cta{padding:28px;background:var(--surface);border:1px solid var(--line);border-radius:12px;margin-block:35px}.free-tool-cta h2{margin-top:0}.prose .app-cta{margin-block:35px}.prose .app-cta p{margin-bottom:0}.sources{border-top:1px solid var(--line);font-size:.875rem}.sources p{color:var(--muted)}.sources ol{padding-left:20px}.sources li p{margin-top:5px}.consent{position:fixed;bottom:18px;left:18px;right:18px;max-width:600px;padding:22px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);z-index:20;border-radius:12px;font-size:.875rem}.consent p{margin-bottom:12px}.consent>div{display:flex;gap:12px;flex-wrap:wrap}[hidden]{display:none!important}.skip{position:fixed;top:-100px;left:20px;background:var(--surface);padding:12px;z-index:100}.skip:focus{top:10px}.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}.print-sheet table{margin-top:25px}.print-sheet td{height:55px}
@media(max-width:1000px){.home-intro{gap:6%;grid-template-columns:1.3fr 1fr}.home-note{padding:25px}.hand-note{font-size:1.8rem}.tool-layout{grid-template-columns:minmax(0,1fr) 230px;gap:24px}.topic-grid,.apps-grid{grid-template-columns:repeat(2,1fr)}.article-layout{grid-template-columns:180px minmax(0,1fr);gap:36px}.site-header nav{gap:18px}.article-grid{gap:20px}}
@media(max-width:720px){.wrap{width:calc(100% - 36px)}.site-header{height:auto;min-height:76px;padding:18px;gap:12px;flex-wrap:wrap}.wordmark{font-size:1.15rem}.site-header nav{order:3;width:100%;justify-content:space-between;border-top:1px solid var(--line);padding-top:14px}.site-header nav a{font-size:.875rem}.theme-toggle{margin-left:auto}.theme-label{display:none}.desktop-nav{display:none}.home-intro{grid-template-columns:1fr;padding-block:45px;gap:38px}.home-intro h1{font-size:3.6rem}.home-note{transform:none;padding:25px}.home-note .eyebrow{margin-bottom:14px}.hand-note{margin-block:14px 20px}.home-note small{display:block}.section{padding-block:48px}.section-heading{align-items:start;flex-direction:column;gap:14px}.section-heading h2{font-size:2rem}.topic-grid,.apps-grid{grid-template-columns:1fr;gap:12px}.topic-card{min-height:0;padding:22px}.topic-card h3{margin-bottom:10px}.topic-card p{margin-bottom:16px}.band-grid{grid-template-columns:1fr;gap:16px}.band-grid>.eyebrow br{display:none}.blue-band{padding-block:42px}.article-grid{grid-template-columns:1fr;gap:32px}.article-card img{aspect-ratio:1.8}.principles{grid-template-columns:1fr;gap:28px}.number{margin-bottom:10px}.principles h3{margin-bottom:12px}footer{padding:36px 18px 18px}.footer-top,.footer-small{flex-direction:column;gap:18px}.footer-links{gap:16px 22px}.footer-small{gap:8px}.topic-heading{align-items:start;margin-top:10px}.topic-heading h1{font-size:2.9rem}.topic-heading .app-icon{width:52px;height:52px;margin:0;border-radius:12px}.topic-heading .lede{font-size:1.1rem}.tool-layout{grid-template-columns:1fr;gap:26px}.log-tool{padding:20px 16px}.tool-top{flex-direction:column;gap:0}.tool-top h2{margin-bottom:12px}.privacy-chip{margin-bottom:12px}.entry-form{grid-template-columns:1fr}.app-cta{padding:20px}.app-identity{min-width:0;align-items:start}.app-identity .app-icon{width:44px;height:44px}.app-cta .button{width:100%}.article-header{margin-block:22px}.article-header h1{font-size:2.8rem}.featured{margin-block:26px}.featured img{aspect-ratio:1.5}.article-layout{display:flex;flex-direction:column;gap:28px}.contents{position:static;border-block:1px solid var(--line);padding-block:20px;gap:10px;width:100%}.contents .eyebrow{margin-bottom:0}.contents .button{display:none}.prose{font-size:1rem}.prose h2{font-size:1.7rem}.lede{font-size:1.125rem}.notice{padding:16px}.consent{bottom:10px;left:10px;right:10px}.apps-grid{margin-top:30px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
@media print{:root{--bg:#fff;--surface:#fff;--ink:#000;--muted:#333;--line:#aaa;--soft:#f5f5f5;color-scheme:light}body{background:#fff;color:#000;font-size:10pt}.site-header,footer,.no-print,.consent,.tool-aside,.app-cta,.topic-heading,.breadcrumbs,.entry-form,.tool-actions,.save-option,.log-tool>.small,.log-tool>.danger,.tool-top,.log-tool>p,.notice,.section:not(.print-sheet),.skip{display:none!important}.wrap{width:100%}.tool-layout{display:block}.log-tool{padding:0;border:0}.table-wrap{overflow:visible}table{font-size:9pt;table-layout:fixed}th,td{min-width:0;padding:6px;overflow-wrap:anywhere}thead{display:table-header-group}tr{break-inside:avoid}.print-sheet{display:block!important}.print-sheet h1{font-size:24pt}.print-sheet p{font-size:10pt}a{color:#000;text-decoration:none}@page{size:landscape;margin:12mm}}