/* toddcameronthompson.com — engine displacement toolset
   Design: precision-instrument / machine-shop. Gunmetal structure, amber
   instrument-readout signature, monospace digits. Mobile-first. No framework. */
:root{
  --ink:#16191c; --ink-2:#414a54; --paper:#f4f5f3; --paper-2:#e9ebe8;
  --steel:#2b3138; --steel-2:#3a424b; --line:#d4d8d3;
  --amber:#f0a300; --amber-ink:#3a2a00; --cyan:#1a8f95; --red:#d63a1e; --green:#1f7a44;
  --card:#ffffff; --shadow:0 1px 2px rgba(22,25,28,.06),0 8px 24px rgba(22,25,28,.08);
  --r:14px; --r-sm:9px; --maxw:1120px;
  --disp:"Barlow Condensed",system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,monospace;
  --body:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--body);color:var(--ink);background:var(--paper);
  line-height:1.62;font-size:17px;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;height:auto}
a{color:#125e63;text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4,h5,h6{font-family:var(--disp);line-height:1.08;letter-spacing:.005em;color:var(--ink);margin:0 0 .5em}
h1{font-size:clamp(2rem,6vw,3.1rem);font-weight:700;text-transform:none}
h2{font-size:clamp(1.5rem,3.8vw,2.15rem);font-weight:600;margin-top:1.8em}
h3{font-size:clamp(1.2rem,2.6vw,1.5rem);font-weight:600;margin-top:1.4em}
h4{font-size:1.1rem;font-weight:600;margin-top:1.1em}
h5,h6{font-size:1rem;font-weight:600}
p,ul,ol,table{margin:0 0 1.05em}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px;border-radius:4px}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(16px,4vw,32px)}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:var(--amber);color:var(--amber-ink);padding:8px 12px;z-index:99;border-radius:6px}
.tiny{font-size:.8rem;color:var(--ink-2);line-height:1.5}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* header / nav — pure HTML, no JS needed to render */
.masthead{background:var(--steel);color:#eef0ee;border-bottom:3px solid var(--amber)}
.masthead .wrap{display:flex;align-items:center;gap:18px;min-height:60px;flex-wrap:wrap;padding-top:8px;padding-bottom:8px}
.brand{font-family:var(--disp);font-weight:700;font-size:1.32rem;color:#fff;letter-spacing:.01em;display:flex;align-items:center;gap:9px}
.brand .dot{width:12px;height:12px;border-radius:50%;background:var(--amber);box-shadow:0 0 0 3px rgba(240,163,0,.25)}
.brand span{color:var(--amber)}
.nav{margin-left:auto;display:flex;gap:2px;flex-wrap:wrap}
.nav a{color:#d7dbd7;padding:8px 11px;border-radius:7px;font-size:.94rem;font-weight:500}
.nav a:hover{background:rgba(255,255,255,.09);text-decoration:none;color:#fff}
.nav a[aria-current="page"]{background:var(--amber);color:var(--amber-ink)}

/* breadcrumb */
.crumbs{font-size:.85rem;color:var(--ink-2);padding:12px 0 0}
.crumbs a{color:var(--ink-2)}.crumbs span{color:var(--ink-2);margin:0 6px}

/* hero (home) — tool leads, long content below */
.home-hero{min-height:calc(100vh - 63px);display:flex;flex-direction:column;justify-content:center;padding:26px 0 34px}
.hero-lede{max-width:64ch}
.hero-lede .eyebrow{font-family:var(--mono);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);margin:0 0 8px}
.hero-lede p{color:var(--ink-2);font-size:1.06rem}

/* the instrument readout — the site signature */
.calc-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);overflow:hidden}
.calc-grid{display:grid;grid-template-columns:1fr;gap:0}
@media(min-width:820px){.calc-grid{grid-template-columns:1.05fr 1fr}}
.calc-inputs{padding:clamp(18px,3vw,26px)}
.calc-readout{background:var(--steel);color:#f6f7f5;padding:clamp(18px,3vw,26px);display:flex;flex-direction:column;position:relative}
.calc-readout::before{content:"";position:absolute;inset:0;background:repeating-linear-gradient(0deg,rgba(255,255,255,.03) 0 1px,transparent 1px 4px);pointer-events:none}
.readout-label{font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:#93a0a6}
.readout-primary{font-family:var(--mono);font-weight:700;color:var(--amber);font-size:clamp(2.3rem,8vw,3.4rem);line-height:1;margin:6px 0 2px;font-variant-numeric:tabular-nums;text-shadow:0 0 22px rgba(240,163,0,.28)}
.readout-primary .u{font-size:.42em;color:#cfd6d9;font-weight:600;margin-left:8px}
.readout-secondary{display:flex;gap:22px;flex-wrap:wrap;margin-top:10px}
.readout-secondary .rs{font-family:var(--mono);font-variant-numeric:tabular-nums}
.readout-secondary .rs b{color:#fff;font-size:1.25rem;display:block;font-weight:600}
.readout-secondary .rs em{color:#93a0a6;font-style:normal;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase}
.readout-note{font-size:.82rem;color:#c9d0cf;margin-top:10px;line-height:1.5}
.readout-trace{margin-top:14px;padding-top:14px;font-family:var(--mono);font-size:.76rem;color:#aeb8bc;border-top:1px solid rgba(255,255,255,.12)}

/* enriched result rows ("what this means") */
.ro-extra{margin-top:12px;border-top:1px solid rgba(255,255,255,.12);padding-top:12px;display:flex;flex-direction:column;gap:9px}
.ro-extra:empty{display:none;border:0;padding:0;margin:0}
.xr{display:flex;flex-direction:column;gap:1px}
.xk{font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;color:#8b979d}
.xv{font-size:.9rem;color:#e7ebe9;line-height:1.42}
.xv strong{color:var(--amber);font-weight:600}
.xv .tiny{color:#93a0a6;display:inline}
.ro-cta{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.mini-btn{background:rgba(240,163,0,.14);border:1px solid rgba(240,163,0,.45);color:#ffd77a;border-radius:8px;padding:7px 11px;font-size:.82rem;font-weight:600}
.mini-btn:hover{background:rgba(240,163,0,.24);text-decoration:none;color:#fff}
.copy-btn{margin-top:12px;align-self:flex-start;background:var(--amber);color:var(--amber-ink);border:0;font-weight:600;padding:8px 14px;border-radius:8px;cursor:pointer;font-family:var(--body);font-size:.9rem}
.copy-btn:hover{filter:brightness(1.06)}

/* form controls */
.field{margin-bottom:15px}
.field label{display:block;font-weight:600;font-size:.92rem;margin-bottom:5px}
.field .hint{font-weight:400;color:var(--ink-2);font-size:.82rem;margin-left:6px}
.field input[type=number],.field input[type=text],.field select{width:100%;font-size:1rem;padding:11px 12px;border:1.5px solid var(--line);border-radius:var(--r-sm);background:#fff;font-family:var(--mono);color:var(--ink)}
.field input:focus,.field select:focus{border-color:var(--steel-2)}
.inline-2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.inline-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.seg{display:inline-flex;border:1.5px solid var(--line);border-radius:var(--r-sm);overflow:hidden;flex-wrap:wrap}
.seg button{border:0;background:#fff;padding:9px 15px;cursor:pointer;font-weight:600;font-family:var(--body);font-size:.9rem;color:var(--ink-2)}
.seg button[aria-pressed="true"]{background:var(--steel);color:#fff}
.err{color:var(--red);font-size:.85rem;margin-top:4px}
.warn{color:#8a5a00;background:#fff6e0;border:1px solid #f3d98a;padding:8px 11px;border-radius:8px;font-size:.85rem;margin-top:8px}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:6px;align-items:center}
.btn{background:var(--steel);color:#fff;border:0;padding:11px 20px;border-radius:9px;font-weight:600;cursor:pointer;font-family:var(--body);font-size:.95rem}
.btn:hover{background:#1f242a}
.btn.ghost{background:#fff;color:var(--ink);border:1.5px solid var(--line)}
.prec-wrap{display:flex;align-items:center;gap:9px;margin-top:4px;font-size:.82rem;color:var(--ink-2)}
.prec-seg{border:1.5px solid var(--line);border-radius:var(--r-sm);overflow:hidden;display:inline-flex}
.prec-seg button{border:0;background:#fff;padding:6px 11px;cursor:pointer;font-weight:600;font-family:var(--body);font-size:.8rem;color:var(--ink-2)}
.prec-seg button[aria-pressed="true"]{background:var(--cyan);color:#fff}
.prefill-note{display:none;background:#eef7f7;border:1px solid #bfe0e0;border-radius:8px;padding:8px 11px;font-size:.84rem;color:#12595e;margin-bottom:12px}
.preset-row{margin-bottom:15px}

/* tank + tax sub-panels */
.subpanel{margin-top:16px;border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;background:#fbfcfa}
.subpanel h4{margin:0 0 8px}
.tank-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:8px 0}
@media(min-width:520px){.tank-grid{grid-template-columns:repeat(4,1fr)}}
.tank-cell{background:#fff;border:1px solid var(--line);border-radius:9px;padding:9px 10px;text-align:center;font-family:var(--mono)}
.tank-cell b{display:block;font-size:1.2rem;color:var(--ink);font-variant-numeric:tabular-nums}
.tank-cell em{font-style:normal;font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-2)}
.tax-out table,.subpanel table{margin-top:8px}

/* content sections */
main{padding-bottom:40px}
.section{padding:8px 0}
.lead{font-size:1.12rem;color:var(--ink-2);max-width:72ch}
.grid-2{display:grid;gap:20px;grid-template-columns:1fr}
@media(min-width:760px){.grid-2{grid-template-columns:1fr 1fr}}
.panel{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px 20px}
.panel h3{margin-top:0}
.callout{border-left:4px solid var(--cyan);background:#eef7f7;padding:12px 16px;border-radius:0 8px 8px 0;margin:0 0 1.1em}
.callout.warnbox{border-left-color:var(--red);background:#fdeeeb}
.callout.notebox{border-left-color:var(--amber);background:#fff7e6}
table{border-collapse:collapse;width:100%;font-size:.92rem}
th,td{border:1px solid var(--line);padding:8px 11px;text-align:left}
th{background:var(--paper-2);font-family:var(--disp);font-weight:600;font-size:1rem}
td.num,th.num{font-family:var(--mono);text-align:right;font-variant-numeric:tabular-nums}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 0 1.1em}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 1.1em;padding:0;list-style:none}
.chips li{background:#fff;border:1px solid var(--line);border-radius:20px;padding:5px 12px;font-size:.85rem;color:var(--ink-2)}

/* SVG figure */
figure.diagram{margin:1.2em 0;border:1px solid var(--line);border-radius:var(--r);background:#fff;padding:16px 18px;box-shadow:var(--shadow)}
figure.diagram svg{display:block;width:100%;height:auto;max-height:340px}
figure.diagram figcaption{font-size:.85rem;color:var(--ink-2);margin-top:10px;line-height:1.5}
.dg-line{stroke:var(--steel);stroke-width:2;fill:none}
.dg-fill{fill:#e9ebe8;stroke:var(--steel);stroke-width:2}
.dg-amber{fill:var(--amber);opacity:.85}
.dg-amber-l{stroke:var(--amber);stroke-width:2.5;fill:none}
.dg-cyan{fill:#bfe4e6;stroke:var(--cyan);stroke-width:2}
.dg-txt{font-family:var(--mono);font-size:13px;fill:var(--ink)}
.dg-txt-s{font-family:var(--mono);font-size:11px;fill:var(--ink-2)}
.dg-dim{stroke:var(--ink-2);stroke-width:1;fill:none}

/* FAQ */
.faq details{border:1px solid var(--line);border-radius:var(--r-sm);margin-bottom:9px;background:#fff}
.faq summary{cursor:pointer;padding:13px 16px;font-weight:600;font-family:var(--disp);font-size:1.12rem;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--amber);font-weight:700}
.faq details[open] summary::after{content:"–"}
.faq details>div{padding:0 16px 14px;color:var(--ink-2)}

/* related tools / internal-link net */
.related{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px 20px}
.related ul{list-style:none;margin:0;padding:0;display:grid;gap:8px;grid-template-columns:1fr}
@media(min-width:640px){.related ul{grid-template-columns:1fr 1fr}}
.related li a{display:block;padding:10px 12px;border:1px solid var(--line);border-radius:9px;font-weight:600;color:var(--ink)}
.related li a:hover{border-color:var(--amber);text-decoration:none;background:#fffaf0}
.related li a small{display:block;font-weight:400;color:var(--ink-2);font-size:.82rem;margin-top:2px}

/* directory (calculators hub) cards */
.dir-grid{display:grid;gap:14px;grid-template-columns:1fr;margin:1.2em 0}
@media(min-width:640px){.dir-grid{grid-template-columns:1fr 1fr}}
@media(min-width:960px){.dir-grid{grid-template-columns:1fr 1fr 1fr}}
.dir-card{border:1px solid var(--line);border-radius:var(--r);background:#fff;padding:16px 18px;display:flex;flex-direction:column;gap:6px}
.dir-card:hover{border-color:var(--amber);box-shadow:var(--shadow)}
.dir-card .k{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--cyan)}
.dir-card h3{margin:0;font-size:1.22rem}
.dir-card p{margin:0;font-size:.9rem;color:var(--ink-2)}
.dir-card a.dir-go{margin-top:auto;font-weight:600;font-size:.9rem}

/* authority / E-E-A-T block + author byline */
.authority{display:flex;gap:14px;align-items:flex-start;background:#f0f2ef;border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;font-size:.9rem;color:var(--ink-2)}
.authority .ico{flex:0 0 auto;width:40px;height:40px;border-radius:50%;background:var(--steel);color:var(--amber);display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-weight:700}
.byline{display:flex;gap:12px;align-items:center;margin:1.1em 0;padding:12px 16px;border:1px solid var(--line);border-radius:var(--r);background:#fff}
.byline .avatar{flex:0 0 auto;width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--steel),var(--steel-2));color:var(--amber);display:flex;align-items:center;justify-content:center;font-family:var(--disp);font-weight:700;font-size:1.1rem}
.byline .who{font-size:.9rem;color:var(--ink-2)}
.byline .who strong{color:var(--ink);font-family:var(--disp);font-size:1.02rem;display:block}
.refs{font-size:.86rem;color:var(--ink-2)}
.refs li{margin-bottom:5px}

/* ad slots */
.ad-slot{margin:22px auto;max-width:970px;min-height:90px;border:1px dashed #cfd3ce;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#9aa19a;font-size:.78rem;font-family:var(--mono);background:repeating-linear-gradient(45deg,#fafbf9 0 10px,#f3f5f2 10px 20px)}

/* share */
.share{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:18px 0}
.share span{font-weight:600;font-size:.88rem;color:var(--ink-2)}
.share a,.share button{display:inline-flex;align-items:center;gap:6px;border:1.5px solid var(--line);background:#fff;border-radius:8px;padding:7px 12px;font-size:.85rem;color:var(--ink);cursor:pointer;font-family:var(--body)}
.share a:hover,.share button:hover{border-color:var(--steel-2);text-decoration:none}

/* footer */
.foot{background:var(--steel);color:#c4ccc9;margin-top:40px;padding:34px 0 26px;font-size:.9rem}
.foot .cols{display:grid;gap:22px;grid-template-columns:1fr}
@media(min-width:680px){.foot .cols{grid-template-columns:2fr 1fr 1fr 1fr}}
.foot h4{color:#fff;font-size:1.05rem;margin:0 0 10px}
.foot a{color:#c4ccc9;display:block;padding:3px 0}
.foot a:hover{color:var(--amber)}
.foot .fine{border-top:1px solid rgba(255,255,255,.13);margin-top:24px;padding-top:16px;color:#93a0a6;font-size:.82rem;display:flex;gap:14px;flex-wrap:wrap;justify-content:space-between}
.cookie{position:fixed;left:12px;right:12px;bottom:12px;background:var(--ink);color:#fff;border-radius:12px;padding:14px 16px;display:flex;gap:14px;align-items:center;flex-wrap:wrap;z-index:60;box-shadow:0 10px 40px rgba(0,0,0,.3);font-size:.88rem}
.cookie button{margin-left:auto;background:var(--amber);color:var(--amber-ink);border:0;padding:9px 16px;border-radius:8px;font-weight:600;cursor:pointer}
.tag-cloud{display:flex;gap:8px;flex-wrap:wrap}
.tag-cloud a{background:#fff;border:1px solid var(--line);padding:6px 12px;border-radius:20px;font-size:.85rem;color:var(--ink)}
.tag-cloud a:hover{border-color:var(--amber);background:#fffaf0;text-decoration:none}
.history-wrap{margin:1.2em 0}
.history-list{font-family:var(--mono);font-size:.82rem;color:var(--ink-2);list-style:none;padding:0;margin:8px 0 0}
.history-list li{margin-bottom:4px;padding:6px 10px;background:#fff;border:1px solid var(--line);border-radius:7px}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* ---- language switcher ---- */
.masthead .wrap{position:relative}
.langsw{margin-left:auto;position:relative}
.langsw-btn{font-family:var(--mono);font-weight:600;font-size:.9rem;background:rgba(255,255,255,.08);color:#eef0ee;border:1px solid rgba(255,255,255,.18);border-radius:var(--r-sm);padding:7px 12px;cursor:pointer;line-height:1;display:flex;align-items:center;gap:5px}
.langsw-btn:hover{background:rgba(255,255,255,.15)}
.langsw-menu{display:none;position:absolute;right:0;top:calc(100% + 6px);min-width:190px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-sm);box-shadow:var(--shadow);z-index:80;overflow:hidden}
.langsw-menu.open{display:block}
.langsw-menu a{display:block;padding:10px 14px;color:var(--ink);font-family:var(--mono);font-size:.9rem;font-weight:500;border-bottom:1px solid var(--line)}
.langsw-menu a:last-child{border-bottom:0}
.langsw-menu a:hover{background:var(--paper);color:var(--amber-ink)}
.langsw-menu a[aria-current="true"]{background:var(--paper);font-weight:700;color:var(--amber-ink)}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}
@media (max-width:680px){.langsw{margin-left:0}.langsw-menu{right:auto;left:0}}