/* Layout: sticky toolbar, short intro, then stacked tool sections on a graph-paper ground. Ink-blue accent, mono for every figure. */
:root{
  --bg:#EEF2F5; --grid:#E0E7EC; --surface:#FFFFFF; --ink:#0E1B26; --muted:#52646F;
  --line:#D2DCE3; --accent:#1F4BFF; --accent-ink:#FFFFFF; --accent-soft:#E6ECFF;
  --good:#0B7A53; --warn:#A35F00; --bad:#B3261E;
  --display:"Bricolage Grotesque","Segoe UI",system-ui,sans-serif;
  --body:"IBM Plex Sans","Segoe UI",system-ui,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0B131A; --grid:#111C25; --surface:#131F29; --ink:#E7EEF3; --muted:#93A6B3;
    --line:#243645; --accent:#7D98FF; --accent-ink:#0B131A; --accent-soft:#1A2744;
    --good:#4CC796; --warn:#E3A33F; --bad:#F2877F; color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#0B131A; --grid:#111C25; --surface:#131F29; --ink:#E7EEF3; --muted:#93A6B3;
  --line:#243645; --accent:#7D98FF; --accent-ink:#0B131A; --accent-soft:#1A2744;
  --good:#4CC796; --warn:#E3A33F; --bad:#F2877F; color-scheme:dark;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0; padding-inline:16px; padding-block:0;
  font:400 15px/1.55 var(--body); color:var(--ink);
  background-color:var(--bg);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:28px 28px;
}
.wrap{max-width:1080px;margin-inline:auto}
h1,h2,h3{font-family:var(--display);line-height:1.1;margin:0;text-wrap:balance}
h1{font-size:clamp(2rem,6vw,3.4rem);font-weight:700;letter-spacing:-.02em}
h2{font-size:clamp(1.5rem,3.5vw,2rem);font-weight:700;letter-spacing:-.01em}
h3{font-size:1.15rem;font-weight:700}
p{margin:0}
a{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.num,.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}

/* top bar */
.bar{position:sticky;top:0;z-index:5;margin-inline:-16px;padding:10px 16px;background:var(--surface);border-bottom:1px solid var(--line)}
.bar .wrap{display:flex;align-items:center;gap:16px;flex-wrap:wrap;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;font:700 1.2rem var(--display);color:var(--ink);text-decoration:none}
.brand svg{width:28px;height:28px}
nav{display:flex;gap:4px;flex-wrap:wrap;min-width:0}
nav a{padding:6px 10px;border-radius:6px;color:var(--ink);text-decoration:none;font-weight:500;font-size:.92rem}
nav a:hover{background:var(--accent-soft)}
.cur{display:flex;align-items:center;gap:6px;font-size:.85rem;color:var(--muted)}
select,input,textarea{font:inherit;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:8px 10px;min-width:0;width:100%}
select{width:auto}
input[type=number],.num-in{font-family:var(--mono)}
input:focus,select:focus,textarea:focus{border-color:var(--accent)}
label{display:flex;flex-direction:column;gap:4px;font-size:.8rem;font-weight:500;color:var(--muted);letter-spacing:.02em}

/* intro */
.intro{padding-block:44px 28px;display:grid;gap:16px;max-width:760px}
.intro p{font-size:1.1rem;color:var(--muted);max-width:60ch}
.chips{display:flex;gap:8px;flex-wrap:wrap}
.chip{padding:5px 12px;border:1px solid var(--line);border-radius:99px;background:var(--surface);font-size:.85rem;text-decoration:none;color:var(--ink)}
.chip:hover{border-color:var(--accent);color:var(--accent)}

section.tool{padding-block:36px;scroll-margin-top:70px}
.sec-head{display:grid;gap:6px;margin-bottom:18px;max-width:64ch}
.sec-head p{color:var(--muted)}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:18px}
.grid2{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px;align-items:start}
.fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.fields .full{grid-column:1/-1}
.btn{font:600 .9rem var(--body);padding:9px 14px;border-radius:6px;border:1px solid var(--line);background:var(--surface);color:var(--ink);cursor:pointer}
.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.btn.ghost{padding:6px 10px;font-size:.8rem;color:var(--muted)}
.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.hint{font-size:.8rem;color:var(--muted)}

/* line items */
.rows{display:grid;gap:8px;margin-top:6px}
.row{display:grid;grid-template-columns:minmax(0,1fr) 64px 92px 32px;gap:6px;align-items:center}
.row.b{grid-template-columns:minmax(0,1fr) 96px 104px 32px}
.row input,.row select{padding:7px 8px}
.x{width:32px;height:32px;padding:0;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--muted);cursor:pointer;font-size:1rem}
.x:hover{color:var(--bad);border-color:var(--bad)}
.colhead{display:grid;grid-template-columns:minmax(0,1fr) 64px 92px 32px;gap:6px;font-size:.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-top:14px}
.colhead.b{grid-template-columns:minmax(0,1fr) 96px 104px 32px}

/* invoice paper */
.paper{background:#fff;color:#14202A;border:1px solid var(--line);border-radius:4px;padding:22px;box-shadow:0 1px 0 var(--line),0 10px 24px -14px rgba(14,27,38,.35);font-size:.9rem;min-width:0}
.paper .top{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;border-bottom:2px solid #14202A;padding-bottom:12px}
.paper h2{font-size:1.6rem;letter-spacing:.04em;text-transform:uppercase;color:#14202A}
.paper .meta{font-family:var(--mono);font-size:.78rem;line-height:1.7;text-align:right}
.paper .parties{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-block:14px;font-size:.85rem}
.paper .k{font-size:.68rem;text-transform:uppercase;letter-spacing:.08em;color:#5D6D79}
.tbl{overflow-x:auto}
.paper table{width:100%;border-collapse:collapse;font-size:.85rem}
.paper th{font-size:.68rem;text-transform:uppercase;letter-spacing:.07em;text-align:left;color:#5D6D79;border-bottom:1px solid #C9D3DA;padding:6px 4px}
.paper td{padding:7px 4px;border-bottom:1px dashed #D7DFE5;vertical-align:top}
.paper th.r,.paper td.r{text-align:right;font-family:var(--mono);white-space:nowrap}
.totals{margin-left:auto;margin-top:12px;width:min(260px,100%);display:grid;gap:4px;font-size:.88rem}
.totals div{display:flex;justify-content:space-between;gap:12px}
.totals .grand{border-top:2px solid #14202A;padding-top:6px;margin-top:4px;font-weight:600;font-size:1.05rem}
.paper .notes{margin-top:16px;font-size:.8rem;color:#43525D;white-space:pre-wrap}

/* budget */
.sum{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-bottom:16px}
.stat{border:1px solid var(--line);border-radius:8px;padding:10px 12px;min-width:0}
.stat .k{font-size:.72rem;text-transform:uppercase;letter-spacing:.07em;color:var(--muted)}
.stat .v{font:500 1.15rem var(--mono);overflow-wrap:anywhere}
.v.good{color:var(--good)}.v.bad{color:var(--bad)}
.grp{display:grid;gap:12px;margin-top:6px}
.grp .line{display:flex;justify-content:space-between;gap:10px;font-size:.88rem;flex-wrap:wrap}
.track{position:relative;height:12px;background:var(--accent-soft);border-radius:3px;margin-top:5px}
.fill{height:100%;background:var(--accent);border-radius:3px;max-width:100%}
.fill.over{background:var(--warn)}
.tick{position:absolute;top:-4px;bottom:-4px;width:2px;background:var(--ink)}

/* calculators */
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.card{display:grid;gap:14px;align-content:start}
.card .fields{grid-template-columns:repeat(3,minmax(0,1fr))}
.res{display:grid;gap:6px;border-top:1px solid var(--line);padding-top:12px;margin:0}
.res div{display:flex;justify-content:space-between;gap:12px;font-size:.9rem}
.res dt{color:var(--muted)}
.res dd{margin:0;font-family:var(--mono);font-variant-numeric:tabular-nums;text-align:right}
.res .big dd{font-size:1.35rem;font-weight:500;color:var(--accent)}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:6px;overflow:hidden}
.seg button{border:0;background:var(--surface);color:var(--ink);padding:7px 12px;font:500 .82rem var(--body);cursor:pointer}
.seg button[aria-pressed=true]{background:var(--accent);color:var(--accent-ink)}

/* content */
.guide{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.guide article{display:grid;gap:8px;align-content:start}
.guide p,.faq p{color:var(--muted)}
.faq{display:grid;gap:10px;max-width:760px}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:12px 14px}
.faq summary{cursor:pointer;font-weight:600}
.faq details p{margin-top:8px}
code{font-family:var(--mono);font-size:.85em;background:var(--accent-soft);padding:1px 5px;border-radius:4px}
footer{padding-block:36px 48px;border-top:1px solid var(--line);color:var(--muted);font-size:.85rem;display:grid;gap:6px;max-width:760px}

@media (max-width:820px){
  .grid2,.cards,.guide{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:480px){
  .fields,.card .fields{grid-template-columns:minmax(0,1fr)}
  .sum{grid-template-columns:minmax(0,1fr)}
  .paper .parties{grid-template-columns:1fr}
  .paper .meta{text-align:left}
}
@media print{
  body{background:#fff}
  .bar,.intro,.tool:not(#invoice) .sec-head,#invoice .sec-head,#invoice .editor,#budget,#calculators,#guide,#faq,footer,.noprint{display:none!important}
  #invoice{padding:0}.grid2{display:block}.paper{border:0;box-shadow:none;padding:0}
}

/* multi-page additions */
.crumbs{padding-top:22px;font-size:.85rem;color:var(--muted)}
.crumbs a{color:var(--muted);padding:0}
.crumbs [aria-current]{color:var(--ink)}
.page-head{padding-block:18px 8px;display:grid;gap:12px;max-width:760px}
.page-head p{font-size:1.08rem;color:var(--muted);max-width:60ch}
.single{max-width:640px}
.opts{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.opt{display:grid;gap:8px;align-content:start;padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:10px;color:var(--ink);text-decoration:none;transition:border-color .15s,transform .15s}
.opt:hover{border-color:var(--accent);transform:translateY(-2px)}
.opt .tag{justify-self:start;font-size:.7rem;font-weight:600;letter-spacing:.08em;text-transform:uppercase;padding:3px 9px;border-radius:99px;background:var(--accent-soft);color:var(--accent)}
.opt p{color:var(--muted);font-size:.92rem}
.opt .ex{font-family:var(--mono);font-size:.8rem;padding:8px 10px;border:1px dashed var(--line);border-radius:6px;overflow-wrap:anywhere}
.opt .go{font-weight:600;color:var(--accent);font-size:.9rem}
.why{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:8px}
.why p{color:var(--muted)}
.more{padding-block:28px}
.more h2{font-size:1.25rem;margin-bottom:12px}
.mlinks{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.mlinks a{padding:10px 12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);text-decoration:none;font-weight:500;font-size:.92rem}
.mlinks a:hover{border-color:var(--accent);color:var(--accent)}
nav a[aria-current=page]{background:var(--accent-soft);color:var(--accent)}
footer .flinks{display:flex;gap:6px 14px;flex-wrap:wrap;margin-bottom:6px}
footer .flinks a{color:var(--muted)}
@media (max-width:600px){.bar{position:static}}
.ad-slot{margin-block:8px}
.ad-slot[data-slot="banner"]{margin-top:14px}
.ad-slot .ad-label{font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);text-align:center;margin-bottom:4px}
.ad-box{display:block;min-height:100px;overflow:hidden;text-align:center}
.ad-slot[data-slot="mid"] .ad-box{min-height:250px}
.ad-ph{display:grid;place-items:center;gap:4px;min-height:inherit;border:1px dashed var(--line);border-radius:8px;background:var(--surface);color:var(--muted);font:500 .8rem var(--mono);padding:12px}
.ad-ph b{color:var(--ink);font-family:var(--body);font-size:.95rem}
.ad-slot:has(ins[data-ad-status="unfilled"]){display:none}
@media (max-width:600px){.ad-slot[data-slot="bottom"] .ad-box{min-height:250px}}
.legal{max-width:760px;display:grid;gap:14px;padding-block:8px 24px}
.legal h2{font-size:1.2rem;margin-top:10px}
.legal p,.legal li{color:var(--muted)}
.legal ul{margin:0;padding-left:20px;display:grid;gap:6px}
.guide.one{grid-template-columns:minmax(0,1fr);max-width:760px}
@media (max-width:820px){.opts,.why,.mlinks{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:540px){.opts,.why,.mlinks{grid-template-columns:minmax(0,1fr)}}

/* usa */
.updated{font-size:.85rem;color:var(--muted)}
.opts{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:960px){.opts{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:540px){.opts{grid-template-columns:minmax(0,1fr)}}
.mlinks{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:960px){.mlinks{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:540px){.mlinks{grid-template-columns:minmax(0,1fr)}}
.brand{font-size:1.1rem}