@font-face{font-family:Bricolage Grotesque Variable;font-style:normal;font-display:swap;font-weight:200 800;src:url(/assets/bricolage-grotesque-vietnamese-wght-normal-BUzh504Q.woff2)format("woff2-variations");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:Bricolage Grotesque Variable;font-style:normal;font-display:swap;font-weight:200 800;src:url(/assets/bricolage-grotesque-latin-ext-wght-normal-CcLUaPy7.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Bricolage Grotesque Variable;font-style:normal;font-display:swap;font-weight:200 800;src:url(/assets/bricolage-grotesque-latin-wght-normal-DLoelf7F.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:Figtree Variable;font-style:normal;font-display:swap;font-weight:300 900;src:url(/assets/figtree-latin-ext-wght-normal-DCwSJGxG.woff2)format("woff2-variations");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:Figtree Variable;font-style:normal;font-display:swap;font-weight:300 900;src:url(/assets/figtree-latin-wght-normal-D_ZTVpCC.woff2)format("woff2-variations");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}:root{--paper:#f5f7fa;--grid:#dde3ee;--card:#fff;--ink:#14182b;--ink-2:#3a4058;--muted:#5a6178;--yellow:#f5c518;--yellow-soft:#fff4c2;--red:#d7261e;--blue:#2346c8;--green:#17865a;--green-soft:#dcf5e9;--red-soft:#fde4e2;--display:"Bricolage Grotesque Variable", "Segoe UI", system-ui, sans-serif;--body:"Figtree Variable", "Segoe UI", system-ui, sans-serif;--radius:14px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{font-family:var(--body);color:var(--ink);background-color:var(--paper);background-image:linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);-webkit-font-smoothing:antialiased;background-size:24px 24px;margin:0;font-size:1.0625rem;line-height:1.55}h1,h2,h3{font-family:var(--display);letter-spacing:-.02em;margin:0;line-height:1.05}button,input,select{font:inherit;color:inherit}:focus-visible{outline:3px solid var(--blue);outline-offset:3px;border-radius:6px}.skip{background:var(--ink);color:#fff;z-index:10;border-radius:8px;padding:10px 14px;position:absolute;top:-60px;left:16px}.skip:focus{top:12px}.site-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;max-width:1100px;margin:0 auto;padding:18px 20px;display:flex}.logo{font-family:var(--display);color:var(--ink);letter-spacing:-.02em;align-items:center;gap:10px;font-size:1.35rem;font-weight:800;text-decoration:none;display:inline-flex}.site-header nav{gap:4px;display:flex}.site-header nav a{color:var(--ink);white-space:nowrap;border-radius:8px;padding:6px 10px;font-weight:600;text-decoration:none}.site-header nav a:hover{background:var(--yellow-soft)}main{max-width:1100px;margin:0 auto;padding:0 20px 40px}.hero{max-width:820px;padding:18px 0 26px}.hero h1{font-variation-settings:"wdth" 90;text-wrap:balance;font-size:clamp(2.3rem,7vw,4.6rem);font-weight:800}.lede{color:var(--ink-2);max-width:60ch;margin:14px 0 0;font-size:clamp(1.1rem,2.4vw,1.35rem)}.converter{background:var(--card);border:2px solid var(--ink);border-radius:var(--radius);box-shadow:7px 7px 0 var(--ink);overflow:hidden}.ruler{border-bottom:2px solid var(--ink);background-color:var(--yellow);background-image:repeating-linear-gradient(90deg, var(--ink) 0 2px, transparent 2px 60px), repeating-linear-gradient(90deg, var(--ink) 0 1.5px, transparent 1.5px 30px), repeating-linear-gradient(90deg, var(--ink) 0 1px, transparent 1px 6px);background-position:0 0;background-repeat:no-repeat;background-size:100% 17px,100% 11px,100% 6px;height:30px}.workbench{grid-template-columns:minmax(0,1fr);display:grid}.ask,.answer{min-width:0;padding:clamp(16px,4vw,30px)}.answer{border-top:2px solid var(--ink);min-height:140px}.big-label{font-family:var(--display);margin-bottom:8px;font-size:clamp(1.25rem,3vw,1.6rem);font-weight:700;display:block}.big-input{width:100%;min-width:0;font-family:var(--display);border:2px solid var(--ink);background:var(--paper);border-radius:12px;padding:10px 14px;font-size:clamp(1.4rem,5.5vw,2.4rem);font-weight:600;transition:background-color .15s}.big-input:focus{background:#fff}.big-input::placeholder{color:#8d94a8}.ask-hint{color:var(--muted);margin:8px 0 0;font-size:.92rem}.hint-note{background:var(--yellow-soft);overflow-wrap:anywhere;border-radius:10px;margin:10px 0 0;padding:8px 12px}.link-button+.link-button{margin-left:14px}.link-button{color:var(--blue);cursor:pointer;background:0 0;border:none;padding:4px 0;font-weight:700;text-decoration:underline}.result-empty,.result-error{margin:0;font-weight:600}.result-empty{color:var(--muted)}.result-error{color:var(--red);overflow-wrap:anywhere}.result-main{font-family:var(--display);letter-spacing:-.03em;font-variant-numeric:tabular-nums;overflow-wrap:anywhere;margin:0;font-weight:800;line-height:1}.result-number{font-size:clamp(2.6rem,11vw,5rem);animation:.28s cubic-bezier(.2,.9,.3,1.2) pop;display:inline-block}.result-unit{color:var(--red);font-size:clamp(1.5rem,5vw,2.6rem)}.result-sentence{overflow-wrap:anywhere;margin:10px 0 0;font-size:clamp(1.05rem,2.6vw,1.25rem);font-weight:600}.result-fun{color:var(--red);font-weight:800}.result-note{color:var(--ink-2);max-width:70ch;margin:8px 0 0;font-size:.93rem}.result-actions{flex-wrap:wrap;gap:8px;margin-top:16px;display:flex}.suggest-label{margin:14px 0 6px;font-weight:700}.suggest{flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none;display:flex}.suggest-button{border:1.5px solid var(--ink);cursor:pointer;overflow-wrap:anywhere;text-align:left;background:#fff;border-radius:999px;min-height:44px;padding:8px 14px;font-weight:600}.suggest-button:hover{background:var(--yellow)}.bridge{border:2px dashed var(--ink);background:var(--yellow-soft);border-radius:12px;min-width:0;margin:18px 0 0;padding:14px 16px 16px}.bridge legend{float:left;width:100%;margin-bottom:10px;padding:0;font-weight:700}.bridge-options{clear:both;flex-wrap:wrap;gap:8px;display:flex}.pill{border:1.5px solid var(--ink);cursor:pointer;background:#fff;border-radius:999px;align-items:baseline;gap:6px;min-height:44px;padding:8px 14px;font-weight:600;display:inline-flex;position:relative}.pill small{color:var(--muted);font-weight:500}.pill input{opacity:0;cursor:pointer;margin:0;position:absolute;inset:0}.pill:has(input:focus-visible){outline:3px solid var(--blue);outline-offset:2px}.pill.is-on{background:var(--ink);color:#fff}.pill.is-on small{color:#cfd4e4}.field{flex-direction:column;gap:4px;min-width:0;display:flex}.field label,.combo label{color:var(--ink-2);font-size:.9rem;font-weight:600}.field input,.field select{border:2px solid var(--ink);background:#fff;border-radius:10px;width:100%;min-width:0;min-height:46px;padding:8px 10px}.field select{cursor:pointer}.field-inline{max-width:260px;margin-top:12px}.combo{flex-direction:column;gap:4px;min-width:0;display:flex;position:relative}.combo-box{position:relative}.combo-box input{border:2px solid var(--ink);text-overflow:ellipsis;background:#fff;border-radius:10px;width:100%;min-height:46px;padding:8px 44px 8px 10px}.combo-toggle{cursor:pointer;width:40px;color:var(--ink);background:0 0;border:none;border-radius:0 8px 8px 0;position:absolute;top:2px;bottom:2px;right:2px}.combo-pop{z-index:20;border:2px solid var(--ink);box-shadow:4px 4px 0 var(--ink);overscroll-behavior:contain;background:#fff;border-radius:10px;max-height:min(320px,60vh);margin-top:4px;position:absolute;top:100%;left:0;right:0;overflow-y:auto}.combo-group{background:var(--yellow-soft);color:var(--ink-2);padding:4px 12px;font-size:.8rem;font-weight:700;position:sticky;top:0}.combo-option{cursor:pointer;overflow-wrap:anywhere;padding:10px 12px}.combo-option.is-active{background:var(--ink);color:#fff}.combo-option.is-selected:after{content:" ✓";font-weight:700}.combo-empty{color:var(--muted);margin:0;padding:12px}.settings{gap:12px;margin-top:22px;display:grid}.panel{background:var(--card);border:2px solid var(--ink);border-radius:12px}.panel>summary{cursor:pointer;align-items:center;gap:10px;min-height:48px;padding:12px 16px;font-weight:700;list-style:none;display:flex}.panel>summary::-webkit-details-marker{display:none}.panel>summary:before{content:"";border-right:2.5px solid var(--ink);border-bottom:2.5px solid var(--ink);flex:none;width:10px;height:10px;transition:transform .15s;transform:rotate(-45deg)}.panel[open]>summary:before{transform:rotate(45deg)}.manual-fields{grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;padding:0 16px;display:grid}.manual-echo{overflow-wrap:anywhere;margin:12px 16px 16px;font-weight:600}.related ul{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px;margin:0;padding:0 16px 16px;list-style:none;display:grid}.related li{background:var(--paper);font-variant-numeric:tabular-nums;overflow-wrap:anywhere;border-radius:10px;padding:8px 12px}.related-value{font-weight:700}.related-unit{color:var(--muted)}.btn{border:2px solid var(--ink);background:var(--ink);color:#fff;cursor:pointer;border-radius:10px;align-items:center;gap:8px;min-height:44px;padding:9px 16px;font-weight:700;transition:transform .12s,box-shadow .12s;display:inline-flex}.btn:hover{box-shadow:3px 3px 0 var(--yellow);transform:translate(-1px,-1px)}.btn:active{box-shadow:none;transform:translate(1px,1px)}.btn:disabled{opacity:.6;cursor:progress;box-shadow:none;transform:none}.btn-quiet{color:var(--ink);background:#fff}.btn-quiet:hover,.btn-yellow:hover{box-shadow:3px 3px 0 var(--ink)}.btn-yellow{background:var(--yellow);color:var(--ink)}.btn[aria-pressed=true]{background:var(--yellow-soft)}.compare{background:var(--card);border:2px solid var(--ink);border-radius:var(--radius);grid-template-columns:minmax(0,1fr);gap:16px;margin-top:22px;padding:clamp(16px,4vw,30px);display:grid}.compare-title{color:var(--red);text-wrap:balance;overflow-wrap:anywhere;font-size:clamp(1.6rem,4.6vw,2.6rem);font-weight:800}.compare-premise{color:var(--ink-2);margin:10px 0 0}.compare-figure{min-width:0;margin:0}.visual{background:var(--paper);border-radius:12px;padding:10px}.visual-svg{width:100%;height:auto;max-height:420px;display:block}.visual-svg text{font-variant-numeric:tabular-nums}.visual-icon{transform-box:fill-box;animation:.35s cubic-bezier(.2,.9,.3,1.25) both drop-in}.compare-figure figcaption{color:var(--muted);margin-top:8px;font-size:.88rem}.compare-controls{flex-wrap:wrap;align-items:end;gap:12px;display:flex}.compare-controls .field{flex:200px}.compare-controls .picker{flex:100%}.picker{gap:12px;min-width:0;display:grid}.picker-label{color:var(--ink-2);margin-bottom:6px;font-size:.9rem;font-weight:700;display:block}.picker-measures{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.picker-measures .picker-label{margin:0}.chips{flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none;display:flex}.chip{border:1.5px solid var(--ink);cursor:pointer;text-align:left;overflow-wrap:anywhere;background:#fff;border-radius:999px;max-width:100%;min-height:44px;padding:7px 13px;font-weight:600}.chip small{color:var(--muted);font-weight:500}.chip:hover{background:var(--yellow)}.chip[aria-pressed=true]{background:var(--ink);color:#fff}.chip[aria-pressed=true] small{color:#cfd4e4}.picker-search{flex-wrap:wrap;gap:10px;display:flex}.picker-search .field{flex:220px}.picker-count{color:var(--muted);margin:0 0 6px;font-size:.9rem}.picker-list{grid-template-columns:repeat(auto-fill,minmax(min(100%,220px),1fr));gap:6px;margin:0 0 10px;padding:0;list-style:none;display:grid}.picker-item{border:1.5px solid var(--grid);cursor:pointer;text-align:left;background:#fff;border-radius:10px;flex-direction:column;align-items:flex-start;width:100%;min-height:44px;padding:7px 10px;display:flex}.picker-item:hover,.picker-item[aria-current=true]{border-color:var(--ink);background:var(--yellow-soft)}.picker-name{overflow-wrap:anywhere;font-weight:700}.picker-meta{color:var(--muted);overflow-wrap:anywhere;font-size:.85rem}.share-panel{border:2px dashed var(--ink);background:var(--paper);border-radius:12px;margin-top:12px;padding:14px}.share-panel[hidden]{display:none}.share-actions{flex-wrap:wrap;gap:8px;display:flex}.share-preview{margin:14px 0 0}.share-preview img{border:2px solid var(--ink);background:#fff;border-radius:8px;width:100%;max-width:600px;height:auto;display:block}.share-preview p{color:var(--muted);margin:0}.share-preview figcaption{color:var(--muted);margin-top:6px;font-size:.85rem}.share-status{min-height:1.5em;color:var(--green);margin:8px 0 0;font-weight:600}.share-note{color:var(--muted);margin:4px 0 0;font-size:.9rem}.how{border-top:2px solid var(--grid);padding-top:8px}.how summary{cursor:pointer;align-items:center;min-height:44px;font-weight:700;display:flex}.how dl{grid-template-columns:max-content minmax(0,1fr);gap:6px 16px;margin:4px 0 0;display:grid}.how dt{font-weight:700}.how dd{color:var(--ink-2);overflow-wrap:anywhere;margin:0}.catalog{margin-top:48px}.catalog h2{font-size:clamp(1.6rem,4vw,2.4rem)}.catalog-lede{color:var(--ink-2);max-width:62ch;margin:8px 0 0}.catalog-search{max-width:520px;margin-top:16px}.catalog-search input{font-size:1.1rem}.catalog-count{min-height:1.4em;color:var(--muted);margin:6px 0 0;font-size:.92rem}.catalog-empty{border:2px dashed var(--ink);background:var(--card);border-radius:12px;max-width:62ch;margin:8px 0 0;padding:14px 16px}.catalog-areas{gap:18px;margin-top:12px;display:grid}.catalog-area h3{background:var(--yellow);border:2px solid var(--ink);border-radius:8px;margin:0 0 10px;padding:3px 12px 4px;font-size:1.1rem;display:inline-block}.catalog-area.is-special{background:var(--card);border:2px solid var(--ink);border-radius:12px}.catalog-area.is-special>summary{cursor:pointer;flex-direction:column;justify-content:center;min-height:48px;padding:10px 14px;display:flex}.catalog-area.is-special[open]>summary{border-bottom:2px solid var(--grid)}.catalog-area-name{font-family:var(--display);font-size:1.1rem;font-weight:700}.catalog-area-list{color:var(--muted);font-size:.88rem}.catalog-area.is-special>ul{padding:12px}.catalog-area ul,.catalog-hits{grid-template-columns:repeat(auto-fill,minmax(min(100%,230px),1fr));gap:10px;margin:0;padding:0;list-style:none;display:grid}.catalog-hits{margin-top:4px}.catalog-item{background:var(--card);border:1.5px solid var(--ink);border-radius:10px;min-width:0;padding:10px 12px 12px}.catalog-item.is-active{box-shadow:4px 4px 0 var(--ink);border-width:2px}.catalog-cat{text-align:left;cursor:pointer;background:0 0;border:none;flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:2px 8px;width:100%;min-height:36px;padding:4px 0;display:flex}.catalog-name{font-family:var(--display);text-decoration:underline;-webkit-text-decoration-color:var(--yellow);text-decoration-color:var(--yellow);text-underline-offset:3px;font-size:1.08rem;font-weight:700;text-decoration-thickness:3px}.catalog-cat:hover .catalog-name{-webkit-text-decoration-color:var(--ink);text-decoration-color:var(--ink)}.catalog-item.is-active .catalog-name{-webkit-text-decoration-color:var(--red);text-decoration-color:var(--red)}.catalog-count-small{color:var(--muted);font-variant-numeric:tabular-nums;flex:none;font-size:.82rem}.catalog-groups{flex-wrap:wrap;gap:6px;margin-top:6px;display:flex}.catalog-group{border:1px solid var(--grid);background:var(--paper);min-height:32px;color:var(--ink-2);cursor:pointer;text-align:left;overflow-wrap:anywhere;border-radius:6px;padding:4px 8px;font-size:.86rem}.catalog-group:hover{border-color:var(--ink);background:var(--yellow-soft)}.catalog-more{color:var(--muted);align-self:center;font-size:.85rem}.catalog-symbols{color:var(--muted);overflow-wrap:anywhere;margin:6px 0 0;font-size:.85rem}.sr-only{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.about{margin-top:56px}.about h2{font-size:clamp(1.7rem,4vw,2.4rem)}.about-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px 34px;margin-top:18px;display:grid}.about h3{margin-bottom:6px;font-size:1.2rem}.about p,.about ul{color:var(--ink-2);max-width:62ch;margin:0}.about ul{padding-left:1.1em}.about li+li{margin-top:4px}.site-footer{max-width:1100px;color:var(--muted);margin:0 auto;padding:20px 20px 40px;font-size:.92rem}.site-footer p{margin:6px 0 0}.footer-links{border-top:2px solid var(--grid);flex-wrap:wrap;gap:4px 18px;padding-top:14px;display:flex}.footer-links a,.footer-links .link-button{color:var(--ink);font-weight:600;font-size:inherit;padding:8px 0}.footer-links .link-button+.link-button,.footer-links a+.link-button{margin-left:0}.links{margin-top:28px}.links h2,.info h2{font-size:clamp(1.3rem,3vw,1.6rem)}.links ul,.page-list{flex-wrap:wrap;gap:8px;margin:10px 0 0;padding:0;list-style:none;display:flex}.links a,.page-list a{border:1.5px solid var(--ink);background:var(--card);min-height:44px;color:var(--ink);border-radius:999px;align-items:center;padding:8px 14px;font-weight:600;text-decoration:none;display:inline-flex}.links a:hover,.page-list a:hover{background:var(--yellow)}.info{max-width:68ch;margin-top:40px}.info p{color:var(--ink-2);margin:10px 0 0}.info-formula{font-family:var(--display);background:var(--yellow-soft);border:2px solid var(--ink);overflow-wrap:anywhere;border-radius:10px;padding:8px 14px;font-size:1.25rem;font-weight:700;display:inline-block;color:var(--ink)!important}.page-text{max-width:68ch;padding:8px 0 24px}.page-text h1{font-size:clamp(2rem,6vw,3rem)}.page-text h2{margin-top:28px;font-size:1.3rem}.page-text p{color:var(--ink-2)}.page-text code{background:var(--card);border:1px solid var(--grid);overflow-wrap:anywhere;border-radius:4px;padding:1px 4px}.ad{margin:36px 0}.ad-label{color:var(--muted);margin:0 0 4px;font-size:.8rem;font-weight:600}.ad-box{background:var(--card);border:1px solid var(--grid);border-radius:8px;justify-content:center;align-items:center;min-height:280px;display:flex;overflow:hidden}.ad-box ins{width:100%}.ad-test{text-align:center;color:var(--muted);margin:0;padding:16px;font-size:.9rem}@keyframes pop{0%{opacity:.4;transform:scale(.94)}to{opacity:1;transform:scale(1)}}@keyframes drop-in{0%{opacity:0;transform:translateY(-14px)scale(.85)}to{opacity:1;transform:none}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,:before,:after{transition:none!important;animation:none!important}}@media (width>=900px){.workbench{grid-template-columns:minmax(0,1fr) minmax(0,1.15fr)}.answer{border-top:none;border-left:2px solid var(--ink)}.compare{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);column-gap:34px}.compare-text{grid-area:1/1}.compare-figure{grid-area:1/2/span 4}.compare-controls,.share,.how{grid-column:1}}@media (width<=760px){.manual-fields{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width<=640px){body{font-size:1rem}.site-header{padding:12px 16px}.site-header nav a{padding:8px 6px}main{padding:0 12px 32px}.hero{padding:4px 0 16px}.hero h1{font-size:clamp(1.9rem,9vw,2.6rem)}.lede{margin-top:8px;font-size:1rem}.converter{box-shadow:4px 4px 0 var(--ink)}.ask-hint{font-size:.86rem}.manual-fields,.how dl{grid-template-columns:minmax(0,1fr)}.how dd{margin-bottom:6px}.about-grid{grid-template-columns:1fr}}@media (width<=360px){.site-header nav{justify-content:space-between;gap:0;width:100%}.site-header nav a{padding:10px 4px;font-size:.92rem}.result-actions .btn{flex:100%;justify-content:center}}
