/* MossPearl: a field notebook for planted tanks. Newsreader for prose and figures, IBM Plex Mono for labels, inputs and data.
   Paper, ink and one restrained moss green. No gradients, no shadows; structure comes from rules, a faint graph grid and the type. */
@font-face{font-family:Newsreader;src:url(/assets/fonts/newsreader-latin-var.woff2) format("woff2");font-weight:200 800;font-style:normal;font-display:swap}
@font-face{font-family:Newsreader;src:url(/assets/fonts/newsreader-italic-latin-var.woff2) format("woff2");font-weight:200 800;font-style:italic;font-display:swap}
@font-face{font-family:"Plex Mono";src:url(/assets/fonts/plexmono-400.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"Plex Mono";src:url(/assets/fonts/plexmono-500.woff2) format("woff2");font-weight:500;font-display:swap}
:root{--paper:#f3f0e6;--leaf:#ebe7da;--card:#faf8f2;--ink:#1e2620;--ink2:#3a443b;--mute:#4f5b4c;--moss:#2f4a33;--link:#24452c;--rule:#c3ccb8;--line:#6f7c69;--grid:#e4e3d6;--pearl:#dfe8d6;--rust:#8e3a22;
 --serif:Newsreader,"Iowan Old Style",Georgia,serif;--mono:"Plex Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;--w:72rem}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--paper);color:var(--ink);-webkit-text-size-adjust:100%}
body{margin:0;font:400 1.0625rem/1.6 var(--serif);font-optical-sizing:auto;font-variant-numeric:lining-nums}
.wrap{max-width:var(--w);margin:0 auto;padding:0 1.25rem}
a{color:var(--link);text-decoration-thickness:1px;text-underline-offset:.18em}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--moss);outline-offset:2px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:var(--paper);padding:.6rem 1rem;z-index:9}.skip:focus{left:.5rem}
.vh{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.preview{background:var(--ink);color:var(--paper);font:500 .8rem/1.4 var(--mono);text-align:center;padding:.45rem 1rem}.preview p{margin:0}
/* header */
.top{border-bottom:1px solid var(--ink)}
.bar{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;padding-top:1.1rem;padding-bottom:.6rem;flex-wrap:wrap}
.mark{display:inline-flex;align-items:center;gap:.5rem;color:var(--ink);text-decoration:none;font-size:1.6rem;font-weight:500;letter-spacing:-.015em;min-height:44px}
.m{width:1.35rem;height:1.35rem;fill:none;stroke:var(--moss);stroke-width:1.6;stroke-linecap:round}
.tag{margin:0;font-style:italic;color:var(--mute);font-size:1rem}
.index{border-top:1px solid var(--rule)}
.index ul{list-style:none;display:grid;grid-template-columns:repeat(8,auto);justify-content:space-between;margin:0 auto;padding-top:0;padding-bottom:0}
.index a{display:flex;align-items:baseline;gap:.4rem;padding:.65rem .1rem;min-height:44px;color:var(--ink2);text-decoration:none;font-size:1rem;border-bottom:2px solid transparent}
.index a:hover{color:var(--ink);border-bottom-color:var(--rule)}
.index a[aria-current]{color:var(--ink);border-bottom-color:var(--moss)}
.no{font:400 .75rem/1 var(--mono);color:var(--mute)}
/* page head */
main{display:block}
.head{max-width:var(--w);margin:0 auto;padding:2.6rem 1.25rem 1.4rem}
.kicker{font:500 .78rem/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--mute);margin:0 0 .9rem;display:flex;gap:1.2rem;flex-wrap:wrap}
h1{font-weight:450;font-size:clamp(2.1rem,4.6vw,3.3rem);line-height:1.06;letter-spacing:-.02em;margin:0 0 .8rem;max-width:22ch}
.lede{font-size:1.25rem;line-height:1.5;color:var(--ink2);margin:0;max-width:40rem}
.stamp{display:flex;flex-wrap:wrap;gap:.3rem 1.6rem;margin:1.2rem 0 0;padding:0;font:400 .8rem/1.5 var(--mono);color:var(--mute)}
.stamp p{margin:0}.stamp b{font-weight:500;color:var(--ink2);margin-right:.4rem}
h2{font-weight:500;font-size:1.65rem;line-height:1.2;letter-spacing:-.01em;margin:2.4rem 0 .7rem}
h3{font-weight:600;font-size:1.15rem;line-height:1.3;margin:1.6rem 0 .4rem}
/* calculator sheet */
.sheet{max-width:var(--w);margin:0 auto 1rem;padding:0 1.25rem;display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:0;border-top:2px solid var(--ink)}
.inputs{padding:1.2rem 1.4rem 1.6rem 0;border-right:1px solid var(--rule);
 background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24'%3E%3Cpath d='M24 0H0v24' fill='none' stroke='%23e4e3d6'/%3E%3C/svg%3E")}
.result{padding:1.2rem 0 1.6rem 1.6rem;min-width:0}
fieldset{border:0;margin:0 0 1.1rem;padding:0;min-width:0}
legend{font:500 .78rem/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--moss);padding:0 0 .35rem;margin-bottom:.2rem;width:100%;border-bottom:1px solid var(--rule)}
.row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:.3rem 1rem;align-items:center;padding:.42rem 0;border-bottom:1px dotted var(--rule)}
.row label{font-size:1rem;line-height:1.3}
.row small,.lab small{display:block;color:var(--mute);font-size:.85rem;line-height:1.35;margin-top:.1rem}
.ex{font:400 .72rem/1 var(--mono);font-style:normal;text-transform:uppercase;letter-spacing:.05em;color:var(--mute);border:1px solid var(--rule);padding:.12rem .3rem;margin-left:.35rem;vertical-align:.12em;white-space:nowrap}
.inp{display:flex;align-items:center;gap:.4rem}
input[type=number],select{font:400 1rem/1.2 var(--mono);color:var(--ink);background:var(--card);border:1px solid var(--line);border-radius:0;min-height:44px;padding:.45rem .55rem}
input[type=number]{width:7.2rem;text-align:right}
select{max-width:100%;width:100%;padding-right:1.6rem}
.u{font:400 .85rem/1 var(--mono);color:var(--mute);min-width:2.6rem}
.field{padding:.42rem 0;border-bottom:1px dotted var(--rule)}.field label,.field .lab{display:block;margin-bottom:.35rem}
/* segmented units */
.seg{display:inline-flex;border:1px solid var(--line);margin:.2rem 0 .6rem}
.seg label{position:relative;display:block}
.seg input{position:absolute;opacity:0;inset:0;margin:0;cursor:pointer}
.seg span{display:block;font:500 .85rem/1 var(--mono);padding:.85rem .9rem;min-width:44px;text-align:center;color:var(--ink2)}
.seg input:checked+span{background:var(--ink);color:var(--paper)}
.seg input:focus-visible+span{outline:2px solid var(--moss);outline-offset:2px}
.seg label+label span{border-left:1px solid var(--line)}
.unitbar{display:flex;flex-wrap:wrap;gap:0 1.2rem;align-items:center}
.unitbar .lab{font:500 .78rem/1.3 var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--mute)}
/* result */
.big{font-weight:400;font-size:clamp(3.2rem,8vw,5.4rem);line-height:.95;letter-spacing:-.03em;margin:.2rem 0 .3rem;font-variant-numeric:lining-nums tabular-nums}
.big small{font-size:.32em;letter-spacing:0;margin-left:.25rem;color:var(--ink2)}
.sub{font-size:1.15rem;margin:.2rem 0 1rem;color:var(--ink2)}
.rlabel{font:500 .78rem/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--mute);margin:0}
.pair{display:grid;grid-template-columns:repeat(auto-fit,minmax(9.5rem,1fr));gap:0;border-top:1px solid var(--rule);margin:1rem 0}
.pair div{padding:.7rem .8rem .7rem 0;border-bottom:1px solid var(--rule)}
.pair b{display:block;font-weight:400;font-size:1.7rem;line-height:1.1;font-variant-numeric:tabular-nums}
.pair span{font:400 .78rem/1.3 var(--mono);color:var(--mute)}
.working{font:400 .85rem/1.7 var(--mono);color:var(--ink2);border-left:2px solid var(--moss);padding:.2rem 0 .2rem .9rem;margin:1rem 0;overflow-wrap:anywhere}
.working p{margin:0}
.verdict{border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);padding:.7rem 0;margin:1rem 0;font-size:1.05rem}
.verdict b{font-weight:600}
.warn{color:var(--rust)}
.note{font-size:.95rem;color:var(--ink2)}
.small{font-size:.9rem;color:var(--mute)}
/* chart */
.chart{margin:1rem 0;overflow-x:auto}
.chart svg{display:block;max-width:100%;height:auto}
.chart .t{font:400 11px var(--mono);fill:var(--mute)}
.chart figcaption{font-size:.9rem;color:var(--mute);margin-top:.4rem}
/* prose and tables */
.prose{max-width:var(--w);margin:0 auto;padding:0 1.25rem 1rem}
.prose>p,.prose>ul,.prose>ol,.prose>h2,.prose>h3,.prose>dl,.prose>blockquote{max-width:42rem}
.prose li{margin:.25rem 0}
.prose blockquote{margin:1rem 0;padding:0 0 0 1rem;border-left:2px solid var(--rule);font-style:italic;color:var(--ink2)}
.cols{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,4fr);gap:2.5rem;align-items:start}
.margin{font-size:.95rem;color:var(--ink2);border-top:2px solid var(--ink);padding-top:.8rem}
.margin h2{font:500 .78rem/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--moss);margin:0 0 .5rem}
.margin p{margin:.2rem 0 .8rem}
.tablewrap{overflow-x:auto;margin:1rem 0 1.4rem;border-top:2px solid var(--ink)}
table{border-collapse:collapse;width:100%;font-size:.95rem}
caption{text-align:left;font:500 .78rem/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--mute);padding:.6rem 0}
th,td{text-align:left;vertical-align:top;padding:.55rem .8rem .55rem 0;border-bottom:1px solid var(--rule)}
thead th{font:500 .75rem/1.3 var(--mono);text-transform:uppercase;letter-spacing:.04em;color:var(--mute);border-bottom:1px solid var(--ink)}
tbody th{font-weight:500}
th small,td small{display:block;font-weight:400;color:var(--mute);font-size:.82rem}
.num{font-family:var(--mono);font-size:.9rem;white-space:nowrap}
tr.on td,tr.on th{background:var(--pearl)}
tr.off th,tr.off td{color:var(--mute)}
.fit{font:500 .8rem/1.3 var(--mono);white-space:nowrap}
.grid td.hi{background:var(--pearl);font-weight:500}
/* home index */
.toc{max-width:var(--w);margin:0 auto;padding:0 1.25rem;list-style:none;border-top:2px solid var(--ink)}
.toc li{display:grid;grid-template-columns:3.2rem minmax(0,1.1fr) minmax(0,1.6fr);gap:0 1.4rem;padding:1.05rem 0;border-bottom:1px solid var(--rule);align-items:baseline}
.toc .no{font-size:.9rem}
.toc a{font-size:1.45rem;line-height:1.2;text-decoration:none;color:var(--ink);font-weight:450}
.toc a:hover{text-decoration:underline}
.toc p{margin:0;color:var(--ink2)}
.toc p small{display:block;color:var(--mute);font:400 .78rem/1.5 var(--mono);margin-top:.2rem}
.intro{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,4fr);gap:2.5rem;align-items:end}
.intro h1{font-size:clamp(2.4rem,5.4vw,4rem);max-width:16ch}
/* sources */
.sources{max-width:var(--w);margin:2rem auto 0;padding:1rem 1.25rem 0}
.sources h2{font:500 .78rem/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--moss);margin:0 0 .4rem;padding-top:.8rem;border-top:2px solid var(--ink)}
.sources ol{list-style:none;margin:0;padding:0;columns:2;column-gap:2.5rem}
.sources li{display:flex;gap:.7rem;break-inside:avoid;padding:.4rem 0;border-bottom:1px dotted var(--rule);font-size:.95rem}
.sources li small{display:block;color:var(--mute);font:400 .75rem/1.5 var(--mono)}
.sn{font:500 .8rem/1.6 var(--mono);color:var(--mute);min-width:1.4rem}
.src{text-decoration-style:dotted}
sup.n{font:500 .62rem/0 var(--mono);margin-left:.08rem}sup.n a{text-decoration:none;padding:0 .1rem}
.callout{border:1px solid var(--line);background:var(--card);padding:.8rem 1rem;margin:1rem 0;max-width:42rem}
.callout p{margin:.2rem 0}
.btn{font:500 .9rem/1 var(--mono);background:var(--card);color:var(--ink);border:1px solid var(--ink);padding:.8rem 1rem;min-height:44px;cursor:pointer;border-radius:0}
.btn.on{background:var(--ink);color:var(--paper)}
.btns{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:.5rem}
/* consent bar */
.consent{position:fixed;left:0;right:0;bottom:0;background:var(--card);border-top:2px solid var(--ink);padding:.9rem 0;z-index:5}
.consent p{margin:0 0 .3rem;max-width:46rem}
/* footer */
.foot{margin-top:3.5rem;border-top:1px solid var(--ink);background:var(--leaf);font-size:.95rem}
.foot .wrap{display:grid;grid-template-columns:minmax(0,2fr) repeat(3,minmax(0,1fr));gap:1.5rem 2rem;padding-top:1.8rem;padding-bottom:1.5rem}
.fa p{margin:0 0 .6rem;max-width:30rem}
.fm{display:flex;align-items:center;gap:.4rem;font-size:1.2rem}
.fh{font:500 .75rem/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--mute);margin:0 0 .5rem}
.foot ul{list-style:none;margin:0;padding:0}.foot li a{display:inline-block;padding:.32rem 0;min-height:24px}
.fb{grid-column:1/-1;margin:0;padding-top:1rem;border-top:1px solid var(--rule);font:400 .78rem/1.5 var(--mono);color:var(--mute)}
/* 404 */
.lost{min-height:40vh}
@media (max-width:980px){.index ul{grid-template-columns:repeat(4,minmax(0,1fr));gap:0 1rem}.index a{border-bottom:0;border-left:2px solid transparent;padding-left:.4rem}.index a[aria-current]{border-left-color:var(--moss)}}
@media (max-width:860px){.sheet{grid-template-columns:1fr}.inputs{padding-right:0;border-right:0;border-bottom:1px solid var(--rule)}.result{padding-left:0}
 .cols,.intro{grid-template-columns:1fr;gap:1rem}.sources ol{columns:1}.foot .wrap{grid-template-columns:1fr 1fr}.fa{grid-column:1/-1}
 .toc li{grid-template-columns:2.4rem minmax(0,1fr)}.toc li p{grid-column:2}}
@media (max-width:520px){.index ul{grid-template-columns:repeat(2,minmax(0,1fr))}.tag{display:none}.row{grid-template-columns:1fr}.inp{justify-content:flex-start}
 .head{padding-top:1.8rem}.lede{font-size:1.12rem}}
@media print{.top,.foot,.consent,.preview{display:none}body{background:#fff}}
.grid td.me{outline:2px solid var(--ink);outline-offset:-2px;font-weight:600}
.check{display:flex;gap:.6rem;align-items:center;min-height:44px;padding:.3rem 0}
.check input{width:22px;height:22px;accent-color:var(--moss);margin:0}
.lede em,.prose em{font-style:italic}
dl.terms dt{font-weight:600;margin-top:.8rem}dl.terms dd{margin:0}
.onpage{margin:0 0 1.5rem;padding:.6rem 0;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);max-width:42rem}
.onpage h2{font:500 .78rem/1.3 var(--mono);letter-spacing:.06em;text-transform:uppercase;color:var(--mute);margin:0 0 .3rem}
.onpage ol{margin:0;padding-left:1.3rem;columns:2;column-gap:2rem}.onpage li{margin:.1rem 0}
.more{max-width:var(--w);margin:0 auto;padding:0 1.25rem;list-style:none;border-top:2px solid var(--ink)}
.more li{padding:.8rem 0;border-bottom:1px solid var(--rule)}.more p{margin:.1rem 0 0;color:var(--ink2)}
code{font:400 .9em var(--mono)}
.check input{width:24px;height:24px}
a.cell{display:inline-block;padding:.2rem 0;min-height:24px}
.tablewrap:focus-visible{outline:2px solid var(--moss);outline-offset:2px}
.check input{flex:none}
.tablewrap{padding-top:.3rem}