:root{--paper:#F6F8F7;--sheet:#FFFFFF;--ink:#13392E;--ink2:#4B655B;--rule:#CFDCD5;--soft:#E7EFEA;--hl:#FFDA47;--hlink:#13392E;--focus:#0B6E99;
--font:"Public Sans",system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color-scheme:light;
box-sizing:border-box;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
@media (prefers-color-scheme:dark){:root{--paper:#0E1714;--sheet:#14211D;--ink:#E2ECE7;--ink2:#9DB3AA;--rule:#2A403A;--soft:#18271F;--hl:#E8C33A;--hlink:#13241E;--focus:#5CC2EE;color-scheme:dark}}
*,*::before,*::after{box-sizing:inherit}
html[lang=ar],html[lang=ur]{direction:rtl}
html[lang=ar]{--font:"Noto Sans Arabic","Public Sans",Tahoma,sans-serif}
html[lang=ur]{--font:"Noto Nastaliq Urdu","Noto Sans Arabic",Tahoma,sans-serif}
html[lang=hi]{--font:"Noto Sans Devanagari","Public Sans",sans-serif}
html[lang=zh]{--font:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.6 var(--font);-webkit-text-size-adjust:100%}
html[lang=ur] body{line-height:2.1}
a{color:inherit;text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
img,svg{max-width:100%}
.skip{position:absolute;left:-999px;top:0;background:var(--hl);color:var(--hlink);padding:.5rem 1rem}
.skip:focus{left:1rem;z-index:9}
.wrap{max-width:72rem;margin:0 auto;padding:0 1.25rem}
header.site{border-bottom:2px solid var(--ink);background:var(--paper)}
header.site .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:.75rem 1.5rem;padding-top:.85rem;padding-bottom:.85rem}
.brand{display:flex;align-items:center;gap:.55rem;text-decoration:none;font-weight:800;letter-spacing:-.02em;font-size:1.15rem}
.brand .mark{display:inline-grid;place-items:center;width:1.9rem;height:1.9rem;border:2px solid var(--ink);font-size:1rem;line-height:1}
nav.main{display:flex;flex-wrap:wrap;gap:1.1rem;font-size:.95rem}
nav.main a{text-decoration:none}
nav.main a:hover,nav.main a[aria-current]{text-decoration:underline}
.langsel{margin-inline-start:auto}
.langsel select{font:inherit;font-size:.9rem;color:var(--ink);background:var(--sheet);border:1px solid var(--rule);padding:.3rem .5rem}
.crumbs{font-size:.88rem;color:var(--ink2);margin:1.25rem 0 0}
.crumbs ol{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:.4rem}
.crumbs li+li::before{content:"/";margin-inline-end:.4rem;color:var(--rule)}
h1,h2,h3{line-height:1.15;letter-spacing:-.015em}
h1{font-size:clamp(1.9rem,4.2vw,2.9rem);font-weight:800;margin:.6rem 0 .6rem;max-width:22ch}
h2{font-size:1.45rem;font-weight:800;margin:2.6rem 0 .8rem}
h3{font-size:1.1rem;font-weight:700;margin:1.6rem 0 .4rem}
.lede{font-size:1.12rem;color:var(--ink2);max-width:62ch;margin:0 0 1.4rem}
.rate-note{display:inline-block;background:var(--soft);border-inline-start:4px solid var(--ink);padding:.35rem .7rem;font-size:.92rem;margin:0 0 1.5rem}
/* calculator: a form on the left, a receipt on the right */
.calc{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);gap:2rem;align-items:start;margin:.5rem 0 1rem}
@media (max-width:760px){.calc{grid-template-columns:1fr}}
.form{background:var(--sheet);border:2px solid var(--ink)}
.line{display:grid;grid-template-columns:2.6rem 1fr minmax(7rem,11rem);align-items:center;border-bottom:1px solid var(--rule)}
.line:last-of-type{border-bottom:0}
.line .no{align-self:stretch;display:grid;place-items:center;font-weight:700;font-size:.85rem;border-inline-end:1px solid var(--rule);color:var(--ink2);font-variant-numeric:tabular-nums}
.line label{padding:.75rem .9rem;font-size:.97rem}
.line input{font:inherit;font-variant-numeric:tabular-nums;width:100%;border:0;border-inline-start:1px solid var(--rule);background:transparent;color:var(--ink);padding:.75rem .8rem;text-align:end;font-weight:600;min-height:3rem}
.line input:focus{outline:none;background:var(--soft);box-shadow:inset 0 -3px 0 var(--ink)}
@media (max-width:460px){.line{grid-template-columns:2.2rem 1fr}.line input{grid-column:2;border-inline-start:0;border-top:1px dashed var(--rule);text-align:start}.line .no{grid-row:span 2}}
.actions{display:flex;gap:.6rem;padding:.9rem;border-top:2px solid var(--ink);background:var(--paper)}
button,.btn{font:inherit;font-weight:700;font-size:.95rem;padding:.6rem 1.2rem;border:2px solid var(--ink);background:var(--ink);color:var(--paper);cursor:pointer}
button[type=reset]{background:transparent;color:var(--ink)}
.receipt{position:relative;background:var(--sheet);padding:1.3rem 1.3rem 2rem;border:1px solid var(--rule);
-webkit-mask:conic-gradient(from -45deg at bottom,#0000,#000 1deg 89deg,#0000 90deg) 50%/16px 100%;mask:conic-gradient(from -45deg at bottom,#0000,#000 1deg 89deg,#0000 90deg) 50%/16px 100%}
.receipt h2{font-size:1rem;margin:0 0 .8rem;font-weight:700;color:var(--ink2);letter-spacing:0}
.receipt dl{margin:0}
.receipt .row{display:flex;align-items:baseline;gap:.5rem;padding:.45rem 0}
.receipt dt{flex:0 1 auto;font-size:.95rem}
.receipt .row::after{content:"";order:2;flex:1;border-bottom:2px dotted var(--rule);transform:translateY(-.25rem)}
.receipt dd{order:3;margin:0;font-weight:700;font-variant-numeric:tabular-nums;white-space:nowrap}
.receipt .row:last-child{margin-top:.5rem;padding-top:.8rem;border-top:2px solid var(--ink)}
.receipt .row:last-child dd{font-size:1.6rem;font-weight:800;background:linear-gradient(transparent 55%,var(--hl) 55%);color:var(--ink);padding:0 .15rem}
@media (prefers-color-scheme:dark){.receipt .row:last-child dd{background:linear-gradient(transparent 55%,#6b5a12 55%)}}
.receipt .fine{font-size:.82rem;color:var(--ink2);margin:1rem 0 0;line-height:1.45}
.prose{max-width:68ch}
.prose ol,.prose ul{padding-inline-start:1.3rem}
.prose li{margin:.35rem 0}
.formula{background:var(--sheet);border:1px solid var(--rule);padding:1rem 1.1rem;font-variant-numeric:tabular-nums;overflow-x:auto}
.formula p{margin:.3rem 0}
table{border-collapse:collapse;width:100%;font-variant-numeric:tabular-nums}
.tbl{overflow-x:auto;max-width:42rem}
th,td{text-align:start;padding:.5rem .7rem;border-bottom:1px solid var(--rule)}
th{border-bottom:2px solid var(--ink);font-size:.9rem}
details{border-top:1px solid var(--rule);padding:.8rem 0}
details:last-of-type{border-bottom:1px solid var(--rule)}
summary{cursor:pointer;font-weight:700}
details p{margin:.6rem 0 0;color:var(--ink2)}
.links{columns:3 15rem;column-gap:2rem;padding:0;list-style:none;margin:0}
.links li{break-inside:avoid;padding:.3rem 0;border-bottom:1px solid var(--soft)}
.links a{text-decoration:none}
.links a:hover{text-decoration:underline}
.small{font-size:.9rem;color:var(--ink2)}
/* home */
.hero{padding:3.5rem 0 2.5rem;border-bottom:1px solid var(--rule)}
.hero h1{font-size:clamp(2.3rem,6.4vw,4.6rem);max-width:15ch;line-height:1.02;letter-spacing:-.03em;margin:0 0 1rem}
.hero p{font-size:1.15rem;max-width:56ch;color:var(--ink2);margin:0 0 1.8rem}
.search{display:flex;max-width:40rem;border:2px solid var(--ink);background:var(--sheet)}
.search input{flex:1;font:inherit;font-size:1.1rem;border:0;background:transparent;color:var(--ink);padding:.9rem 1rem;min-width:0}
.search input:focus{outline:none}
.search:focus-within{box-shadow:0 0 0 3px var(--focus)}
#results{list-style:none;padding:0;margin:.5rem 0 0;max-width:40rem}
#results li a{display:block;padding:.55rem .8rem;border-bottom:1px solid var(--rule);text-decoration:none;background:var(--sheet)}
#results li a:hover,#results li a:focus{background:var(--soft)}
.groups{display:grid;grid-template-columns:repeat(auto-fit,minmax(16rem,1fr));gap:2.5rem;margin:2.5rem 0}
.groups h2{margin-top:0;font-size:1.2rem;padding-bottom:.4rem;border-bottom:2px solid var(--ink)}
.groups ul{list-style:none;padding:0;margin:0}
.groups li{padding:.32rem 0;border-bottom:1px solid var(--soft)}
.groups li a{text-decoration:none}
.groups li a:hover{text-decoration:underline}
.more{display:inline-block;margin-top:.8rem;font-weight:700}
/* blog */
.post-list{list-style:none;padding:0;margin:0;max-width:52rem}
.post-list li{padding:1.1rem 0;border-bottom:1px solid var(--rule)}
.post-list a{font-weight:700;font-size:1.12rem;text-decoration:none}
.post-list a:hover{text-decoration:underline}
.post-list p{margin:.3rem 0 0;color:var(--ink2);font-size:.97rem}
.meta{color:var(--ink2);font-size:.92rem;margin:0 0 1.5rem}
article.post{max-width:68ch}
article.post p{margin:0 0 1.05rem}
.callout{background:var(--sheet);border:2px solid var(--ink);padding:1rem 1.2rem;margin:1.5rem 0}
.callout p:last-child{margin-bottom:0}
.pager{display:flex;flex-wrap:wrap;gap:.4rem;margin:2rem 0}
.pager a,.pager span{padding:.35rem .7rem;border:1px solid var(--rule);text-decoration:none;font-variant-numeric:tabular-nums}
.pager span{background:var(--ink);color:var(--paper);border-color:var(--ink)}
footer.site{margin-top:4rem;border-top:2px solid var(--ink);padding:2rem 0 3rem;font-size:.92rem;color:var(--ink2)}
footer.site .wrap{display:flex;flex-wrap:wrap;gap:1rem 2rem;justify-content:space-between}
footer.site nav{display:flex;flex-wrap:wrap;gap:1rem}
.disclaim{font-size:.88rem;color:var(--ink2);max-width:68ch;margin-top:2.5rem;padding-top:1rem;border-top:1px solid var(--rule)}
@media (prefers-reduced-motion:no-preference){.receipt dd{transition:color .2s}.receipt dd.flash{color:var(--focus)}}