/* Plainsum — "graph paper and a pencil": cool paper ground, cobalt ink, a single marker-yellow highlight on results.
   Layout: inputs left, a "tape" result panel right; stacks on phones. */
:root{
  --bg:#F5F6F8; --paper:#FFFFFF; --ink:#141A2A; --muted:#5A6275; --line:#DADEE6; --grid:#E8EBF1;
  --accent:#2C47C9; --accent-soft:#E6EBFB; --mark:#FFE58A; --warn:#B4451F; --good:#1F7A4D;
  --f-display:"Bricolage Grotesque","Avenir Next","Segoe UI",sans-serif;
  --f-body:"Public Sans","Helvetica Neue",Arial,sans-serif;
  --f-num:"JetBrains Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0F1320; --paper:#161B2B; --ink:#E7EAF3; --muted:#9AA3B8; --line:#2A3146; --grid:#1D2335;
  --accent:#8FA3FF; --accent-soft:#222B4D; --mark:#5C4A0E; --warn:#F09A72; --good:#6FD3A0; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0F1320; --paper:#161B2B; --ink:#E7EAF3; --muted:#9AA3B8; --line:#2A3146; --grid:#1D2335;
  --accent:#8FA3FF; --accent-soft:#222B4D; --mark:#5C4A0E; --warn:#F09A72; --good:#6FD3A0; color-scheme:dark}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.6;
  padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
a{color:var(--accent)}
.wrap{max-width:1080px;margin:0 auto}
.top{display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;padding-block:18px;border-bottom:2px solid var(--ink)}
.logo{font-family:var(--f-display);font-size:26px;font-weight:800;letter-spacing:-.03em;color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:8px}
.logo i{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:6px;background:var(--accent);color:var(--paper);font-style:normal;font-size:17px;font-weight:700}
.top nav{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;min-width:0;flex:1}
.top nav a{flex:0 0 auto;font-size:15px;font-weight:600;color:var(--ink);text-decoration:none;padding:6px 12px;border-radius:6px}
.top nav a:hover{background:var(--accent-soft)}
.top nav a[aria-current="page"]{background:var(--ink);color:var(--bg)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
main{padding-block:30px 44px}
h1{font-family:var(--f-display);font-size:34px;line-height:1.15;letter-spacing:-.02em;margin:0 0 8px;text-wrap:balance}
.lead{color:var(--muted);margin:0 0 24px;max-width:64ch;font-size:17px}
.grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:24px;align-items:start}
@media (max-width:780px){.grid{grid-template-columns:minmax(0,1fr)}}
.form{display:grid;gap:14px;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:20px}
label{display:grid;gap:5px;font-size:14px;font-weight:600;color:var(--ink)}
.hint{font-weight:400;font-size:12.5px;color:var(--muted)}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px;align-items:end}
.row3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;align-items:end}
@media (max-width:440px){.row3{grid-template-columns:1fr 1fr}}
input,select{font:inherit;font-size:16px;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:10px 12px;width:100%}
.unit{position:relative}
.unit input{font-family:var(--f-num);text-align:right}
.unit.pre input{padding-left:26px}.unit.post input{padding-right:40px}
.unit .u{position:absolute;top:50%;transform:translateY(-50%);color:var(--muted);font-size:14px;font-weight:500;pointer-events:none}
.unit.pre .u{left:11px}.unit.post .u{right:11px}
.seg{display:flex;flex-wrap:wrap;gap:6px}
.seg button{font:inherit;font-size:14px;font-weight:600;padding:7px 12px;border-radius:6px;border:1px solid var(--line);background:var(--bg);color:var(--ink);cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.tape{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:22px;min-width:0;
  background-image:linear-gradient(var(--grid) 1px,transparent 1px);background-size:100% 28px;background-position:0 -1px}
@media (min-width:781px){.tape{position:sticky;top:16px}}
.tape .k{font-size:13px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.big{font-family:var(--f-num);font-size:38px;font-weight:700;line-height:1.15;margin:4px 0 16px;font-variant-numeric:tabular-nums;word-break:break-word}
.big span.hl{background:linear-gradient(transparent 55%,var(--mark) 55%);padding:0 2px}
.big small{font-family:var(--f-body);font-size:16px;font-weight:500;color:var(--muted);margin-left:6px}
.big.warn{color:var(--warn);font-size:22px;font-family:var(--f-body)}
dl{margin:0;display:grid;grid-template-columns:minmax(9em,1fr) minmax(0,auto);background:var(--paper);border-top:1px solid var(--line)}
dt,dd{margin:0;padding:9px 0;border-bottom:1px solid var(--line)}
dd{font-family:var(--f-num);text-align:right;font-variant-numeric:tabular-nums;padding-left:12px;overflow-wrap:anywhere}
dt.sum,dd.sum{font-weight:700;border-bottom:none;padding-top:12px}
.note{font-size:13px;color:var(--muted);margin:14px 0 0;background:var(--paper)}
.chart{margin-top:16px;background:var(--paper)}
.chart svg{display:block;width:100%;height:auto}
.legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:12.5px;color:var(--muted);margin-top:6px}
.legend span::before{content:"";display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:5px;vertical-align:-1px;background:var(--c)}
.tbl{overflow-x:auto;margin-block:14px}
.tbl.scroll{max-height:360px;overflow-y:auto;border:1px solid var(--line);border-radius:10px}
table{border-collapse:collapse;width:100%;font-size:14px;background:var(--paper)}
th,td{padding:8px 12px;border-bottom:1px solid var(--line);text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
th{font-size:12.5px;color:var(--muted);font-weight:700;background:var(--bg);position:sticky;top:0}
td{font-family:var(--f-num)}
th:first-child,td:first-child{text-align:left;font-family:var(--f-body)}
.tbl.txt td,.tbl.txt th{text-align:left;white-space:normal;font-family:var(--f-body)}
.pc-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
@media (max-width:860px){.pc-grid{grid-template-columns:minmax(0,1fr)}}
.pc-grid .form h2{font-size:16px;margin:0}
.pc-res{font-family:var(--f-num);font-size:24px;font-weight:700;color:var(--accent);word-break:break-word}
.ad-slot{margin-block:30px;min-height:100px;display:flex;justify-content:center}
.ad-slot:empty{display:none}
.article{max-width:70ch;margin-top:48px;border-top:2px solid var(--ink);padding-top:6px}
.article h2{font-family:var(--f-display);font-size:23px;letter-spacing:-.01em;margin:30px 0 8px;text-wrap:balance}
.article ul,.article ol{padding-left:22px}
.article li+li{margin-top:4px}
.formula{font-family:var(--f-num);font-size:14px;background:var(--paper);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:6px;padding:12px 14px;overflow-x:auto;white-space:nowrap}
details{border-bottom:1px solid var(--line);padding-block:11px}
summary{cursor:pointer;font-weight:700}
details p{margin:8px 0 0;color:var(--muted)}
.related{margin-top:40px}
.related h2{font-size:16px;margin:0 0 10px;font-family:var(--f-display)}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips a{font-size:14px;font-weight:600;text-decoration:none;color:var(--ink);border:1px solid var(--line);background:var(--paper);padding:6px 12px;border-radius:999px}
.chips a:hover{border-color:var(--accent);color:var(--accent)}
/* home */
.hero{padding-block:14px 6px}
.hero h1{font-size:46px;max-width:18ch}
@media (max-width:520px){.hero h1{font-size:34px}}
.hero h1 em{font-style:normal;background:linear-gradient(transparent 60%,var(--mark) 60%)}
.cat-sec{margin-top:34px}
.cat-sec h2{font-family:var(--f-display);font-size:22px;margin:0 0 12px;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
.cat-sec h2 span{font-family:var(--f-body);font-size:14px;font-weight:400;color:var(--muted)}
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
@media (max-width:860px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:520px){.cards{gap:10px}}
.card{display:grid;gap:3px;background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:16px;text-decoration:none;color:var(--ink);min-width:0}
.card:hover{border-color:var(--accent)}
.card strong{font-size:16px}
.card span{font-size:13.5px;color:var(--muted)}
.prose{max-width:70ch}
.prose h2{font-family:var(--f-display);font-size:21px;margin:28px 0 8px}
footer{border-top:1px solid var(--line);padding-block:22px 40px;color:var(--muted);font-size:13px}
footer .links{display:flex;flex-wrap:wrap;gap:6px 18px;margin-bottom:10px}
footer a{color:var(--muted)}
.warn-text{color:var(--warn)}
@media (prefers-reduced-motion: reduce){*{transition:none!important;scroll-behavior:auto!important}}
.row2>*,.row3>*,label{min-width:0}
input[type="date"]{min-width:0;max-width:100%;-webkit-appearance:none;appearance:none;min-height:46px}
.timecard td,.timecard th{padding:6px 6px;font-size:13.5px}
.timecard input{padding:7px 6px;font-size:14px;min-width:0;width:100%}
.timecard input[type="time"]{-webkit-appearance:none;appearance:none;min-height:38px}
.timecard input[type="time"]{width:100%;max-width:8.5em}
@media (max-width:520px){.timecard th:last-child,.timecard td:last-child{display:none}.timecard td,.timecard th{padding:5px 3px}.timecard input{font-size:13px;padding:6px 4px}}
@media (max-width:520px){
  .timecard{table-layout:fixed;width:100%}
  .timecard th:nth-child(1){width:2.7em}.timecard th:nth-child(4){width:3.8em}
  .timecard input[type="time"]{max-width:none;font-size:12.5px;padding:6px 2px;letter-spacing:-.02em}
  .timecard th{font-size:11px}
}
@media (max-width:520px){
  .timecard input[type="time"]::-webkit-calendar-picker-indicator{display:none}
  .timecard th:nth-child(4){width:3.4em}
  .timecard th .hint{display:block;font-size:10px}
}
.timecard input[id^="hr-b"]{width:5em}
@media (max-width:520px){.timecard input[id^="hr-b"]{width:100%;text-align:center}}
.split{display:flex;height:22px;border-radius:6px;overflow:hidden;margin-top:14px;gap:2px}
.split i{display:block;min-width:3px}
.tbl td:first-child,.tbl th:first-child{text-align:left}
#st-src,#pc-state-note,#rt-limit{margin:0;padding:10px 12px;border:1px dashed var(--line);border-radius:8px}
#pc-state-note:empty,#rt-limit:empty{display:none}
[hidden]{display:none!important}
@media (max-width:600px){.top nav{flex-basis:100%;justify-content:space-between}.top nav a{font-size:14px;padding:6px 8px}}
/* row tables (debts, classes, areas) */
.rowtable{width:100%;table-layout:fixed}
.rowtable td,.rowtable th{padding:5px 4px;font-size:13.5px}
.rowtable input,.rowtable select{padding:7px 6px;font-size:14px;min-width:0;width:100%}
.rowtable th:last-child,.rowtable td:last-child{width:34px;text-align:center;padding-left:2px;padding-right:2px}
.delrow{font:inherit;font-size:16px;line-height:1;width:28px;height:32px;padding:0;border:1px solid var(--line);border-radius:6px;background:var(--bg);color:var(--muted);cursor:pointer}
.delrow:hover{color:var(--warn);border-color:var(--warn)}
.rowctl{display:flex;justify-content:flex-start}
.addrow{font:inherit;font-size:14px;font-weight:600;padding:7px 12px;border-radius:8px;border:1px dashed var(--accent);background:transparent;color:var(--accent);cursor:pointer}
#calc-debt .rowtable th:nth-child(1){width:30%}
#calc-gpa .rowtable th:nth-child(2){width:64px}#calc-gpa .rowtable th:nth-child(3){width:62px}#calc-gpa .rowtable th:nth-child(4){width:84px}
#calc-sqft .rowtable th:nth-child(1){width:22px}#calc-sqft .rowtable th:nth-child(4){width:84px}
tr.cur td{font-weight:700;background:var(--accent-soft)}
@media (max-width:520px){.rowtable td,.rowtable th{padding:4px 2px;font-size:12.5px}.rowtable input,.rowtable select{font-size:13px;padding:6px 3px}
  #calc-gpa .rowtable th:nth-child(2){width:56px}#calc-gpa .rowtable th:nth-child(3){width:50px}#calc-gpa .rowtable th:nth-child(4){width:64px}#calc-sqft .rowtable th:nth-child(4){width:64px}}
.big .nw{white-space:nowrap}.big small.blk{display:block}
.review{margin-block:26px 6px;padding:14px 16px;border:1px solid var(--line);border-radius:10px;font-size:14px;color:var(--muted)}
.review p{margin:0}.review p+p,.review .src-h{margin-top:8px}
.review .src-h{font-weight:600;color:var(--ink)}
.review ul{margin:4px 0 0;padding-left:18px}
.review a{color:var(--accent)}
.rowtable th{white-space:normal;line-height:1.2}
.crumbs{margin:0 0 6px;font-size:14px;color:var(--muted)}
.crumbs a{color:var(--accent)}
.states{margin-block:28px}
.chips.cols{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px}
.chips.cols a{text-align:center}
/* ---- search ---- */
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.search{position:relative}
.search input{font-family:var(--f-body);font-weight:400;background:var(--paper);padding-left:38px;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Ccircle cx='10.5' cy='10.5' r='6.5' fill='none' stroke='%235A6275' stroke-width='2.2'/%3E%3Cpath d='M15.5 15.5 21 21' stroke='%235A6275' stroke-width='2.2' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-size:18px;background-position:12px 50%}
.search input::-webkit-search-cancel-button{cursor:pointer}
.search [role=listbox]{position:absolute;z-index:20;left:0;right:0;top:calc(100% + 6px);margin:0;padding:6px;list-style:none;background:var(--paper);
  border:1px solid var(--line);border-radius:10px;box-shadow:0 10px 30px rgba(20,26,42,.14);max-height:min(420px,70vh);overflow-y:auto}
.search [role=option] a{display:grid;gap:1px;padding:9px 10px;border-radius:7px;text-decoration:none;color:var(--ink)}
.search [role=option] b{font-size:15px;font-weight:600}
.search [role=option] span{font-size:13px;color:var(--muted)}
.search [role=option][aria-selected="true"] a,.search [role=option] a:hover{background:var(--accent-soft)}
.search .sr-empty{padding:10px;font-size:14px;color:var(--muted)}
.top .search.in-top{width:240px;flex:0 0 auto}
.top .search.in-top input{padding-top:7px;padding-bottom:7px;font-size:15px}
.search-toggle{display:none;align-items:center;justify-content:center;width:40px;height:40px;margin-left:auto;border:1px solid var(--line);border-radius:8px;background:var(--paper);color:var(--ink);cursor:pointer}
.search.big{max-width:620px;margin-top:4px}
.search.big input{font-size:17px;padding:14px 16px 14px 44px;border-radius:12px;border:1.5px solid var(--ink);background-size:20px;background-position:14px 50%}
.search.big input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
@media (max-width:860px){.top .search.in-top{width:190px}}
@media (max-width:600px){
  .top{gap:10px 12px}
  .search-toggle{display:inline-flex}
  .top nav{order:3}
  .top .search.in-top{display:none;order:2;width:100%;flex-basis:100%}
  .top.search-open .search.in-top{display:block}
}
/* ---- home ---- */
.hero{padding-block:18px 4px}
.popular{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:14px;font-size:14px}
.popular span{color:var(--muted);font-weight:600}
.popular a{font-weight:600;text-decoration:none;color:var(--ink);background:var(--paper);border:1px solid var(--line);padding:5px 11px;border-radius:999px}
.popular a:hover{border-color:var(--accent);color:var(--accent)}
.jump{display:flex;flex-wrap:wrap;gap:8px;margin-top:30px;padding-top:18px;border-top:1px solid var(--line)}
.jump a{font-size:14px;font-weight:600;color:var(--ink);text-decoration:none;padding:6px 12px;border-radius:8px;background:var(--accent-soft)}
.jump a span{color:var(--muted);font-weight:500;margin-left:2px}
.cat-sec{scroll-margin-top:12px}
.state-band{background:var(--paper);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:10px;padding:16px 18px}
.state-band h2{margin-bottom:4px}.state-band p{margin:0;color:var(--muted)}
.state-band a{font-weight:600}
@media (max-width:600px){
  .cards{grid-template-columns:minmax(0,1fr);gap:8px}
  .card{grid-template-columns:minmax(0,1fr) auto;padding:12px 14px;gap:0 10px;align-items:center}
  .card strong{font-size:15px}
  .card strong,.card span{grid-column:1}
  .card::after{content:"›";grid-column:2;grid-row:1 / span 2;font-size:22px;color:var(--muted);line-height:1}
  .hero h1{font-size:32px}
  .cat-sec{margin-top:28px}
}
.states{scroll-margin-top:12px}
/* ---- footer ---- */
.fcols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-bottom:20px}
.fcols div{display:grid;gap:6px;align-content:start}
.fcols .fh{margin:0 0 2px;font-weight:700;color:var(--ink);font-size:13px;letter-spacing:.04em;text-transform:uppercase}
.fcols a{text-decoration:none}.fcols a:hover{color:var(--accent);text-decoration:underline}
.fnote{margin-top:6px}
@media (max-width:600px){.fcols{grid-template-columns:1fr 1fr}.fcols div:last-child{grid-column:1 / -1;grid-template-columns:1fr 1fr}.fcols div:last-child .fh{grid-column:1 / -1}}
@media (max-width:600px){.jump{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;margin-inline:-16px;padding-inline:16px}.jump a{flex:0 0 auto}}
@media (max-width:420px){.search.big input{font-size:16px}}