/* ==========================================================================
   Filament Cost Calculator — design system
   Modelled on established reference calculator sites (inchcalculator.com,
   omnicalculator.com, calculator.net): flat surfaces, 1px rules, dense
   typography, restrained colour, no gradients and no decorative shadows.
   ========================================================================== */

:root{
  --bg:#ffffff;
  --band:#f5f6f8;
  --band-2:#eef0f3;
  --surface:#ffffff;
  --ink:#16191d;
  --ink-2:#2b3038;
  --muted:#5b636e;
  --muted-2:#78808c;
  --line:#d9dde2;
  --line-2:#e6e9ed;
  --accent:#c2410c;
  --accent-ink:#9a3309;
  --accent-soft:#fdf1e9;
  --link:#b4400c;
  --ok:#166534;
  --ok-soft:#f0fdf4;
  --warn:#92400e;
  --warn-soft:#fffbeb;
  --bad:#b91c1c;
  --bad-soft:#fef2f2;
  --radius:8px;
  --radius-sm:6px;
  --radius-lg:12px;
  --container:1200px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
p a{text-decoration:underline;text-decoration-color:#e3b79a;text-underline-offset:2px}
p a:hover{text-decoration-color:var(--link)}
button,input,select{font:inherit}
img{max-width:100%}
.container{width:min(var(--container),calc(100% - 40px));margin:0 auto}
.container-narrow{width:min(780px,calc(100% - 40px));margin:0 auto}
hr{border:0;border-top:1px solid var(--line);margin:34px 0}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:40;background:#fff;border-bottom:1px solid var(--line)}
.nav-wrap{min-height:60px;display:flex;align-items:center;gap:22px}
.brand{display:inline-flex;align-items:center;gap:9px;font-weight:800;font-size:15.5px;letter-spacing:-.01em;color:var(--ink);white-space:nowrap}
.brand:hover{text-decoration:none}
.brand-mark{width:30px;height:30px;border-radius:6px;display:grid;place-items:center;color:#fff;background:var(--accent);font-size:11px;font-weight:900;flex:0 0 auto}
.nav{margin-left:auto;display:flex;align-items:center;gap:4px}
.nav a{padding:8px 11px;color:var(--ink-2);font-size:14.5px;border-radius:6px}
.nav a:hover{background:var(--band);text-decoration:none}
.nav-dd{position:relative}
.nav-dd>summary{list-style:none;cursor:pointer;padding:8px 11px;border-radius:6px;font-size:14.5px;color:var(--ink-2)}
.nav-dd>summary::-webkit-details-marker{display:none}
.nav-dd>summary:after{content:"▾";margin-left:6px;font-size:10px;color:var(--muted-2)}
.nav-dd>summary:hover{background:var(--band)}
.nav-dd[open]>summary{background:var(--band)}
.nav-dd-panel{position:absolute;top:calc(100% + 8px);right:0;width:320px;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:8px;display:grid;grid-template-columns:1fr 1fr;gap:2px}
.nav-dd-panel a{padding:8px 10px;font-size:14px;border-radius:6px;color:var(--ink-2)}
.nav-dd-panel a:hover{background:var(--band);text-decoration:none}

/* header search */
.site-search{flex:1 1 auto;max-width:380px;position:relative;margin-left:8px}
.site-search input{width:100%;height:38px;border:1px solid var(--line);border-radius:var(--radius-sm);padding:0 34px 0 34px;background:#fff;color:var(--ink);font-size:14.5px;outline:none}
.site-search input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.site-search:before{content:"⌕";position:absolute;left:11px;top:50%;transform:translateY(-50%);color:var(--muted-2);font-size:16px}
.site-search .hint{position:absolute;right:9px;top:50%;transform:translateY(-50%);font-size:11px;color:var(--muted-2);border:1px solid var(--line);border-radius:4px;padding:1px 5px}

/* ---------- hero (flat, no gradient) ---------- */
.hero{padding:40px 0 30px;text-align:center;border-bottom:1px solid var(--line-2)}
.hero h1{font-size:clamp(30px,3.6vw,42px);font-weight:800;letter-spacing:-.025em;margin:0;line-height:1.14}
.hero-sub{color:var(--muted);font-size:17px;margin:14px auto 0;max-width:720px}
.hero-sub b{color:var(--ink);font-weight:700}
.hero-search{margin:22px auto 0;max-width:520px;position:relative}
.hero-search input{width:100%;height:46px;border:1px solid var(--line);border-radius:var(--radius);padding:0 16px 0 40px;font-size:15px;outline:none;background:#fff}
.hero-search input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.hero-search:before{content:"⌕";position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--muted-2);font-size:17px}

h1,h2,h3,h4{line-height:1.22;letter-spacing:-.02em;margin:0;font-weight:800}
h2{font-size:24px}
h3{font-size:18px}
h4{font-size:16px}

/* ---------- legacy hero classes (kept so unconverted pages still render) ---------- */
.hero-grid{display:grid;grid-template-columns:1.04fr .96fr;gap:40px;align-items:center;text-align:left}
.eyebrow{margin:0 0 8px;font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--muted-2)}
.hero-copy{font-size:17px;color:var(--muted);margin:14px 0 22px;max-width:620px}
.hero-actions,.calc-actions{display:flex;flex-wrap:wrap;gap:10px}
.hero-meta{display:flex;gap:16px;flex-wrap:wrap;margin-top:20px;color:var(--muted-2);font-size:13px}
.hero-meta span{display:flex;align-items:center;gap:6px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;border:1px solid transparent;border-radius:var(--radius-sm);padding:10px 16px;font-weight:600;cursor:pointer;font-size:15px;transition:.12s ease}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-ink)}
.btn-secondary{background:#fff;border-color:var(--line);color:var(--ink)}
.btn-secondary:hover{background:var(--band)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:var(--ink-2)}
.btn-sm{padding:7px 12px;font-size:13.5px}

/* ---------- sections & bands ---------- */
.section{padding:44px 0}
.section-soft{background:var(--band);border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2)}
.section-heading{max-width:760px;margin-bottom:20px}
.section-heading h2{margin-bottom:8px}
.section-heading p:not(.eyebrow){color:var(--muted);margin:0;font-size:16px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}

/* plain card = 1px rule, no shadow */
.card,.tool-card,.tool-group{background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.card{padding:20px}
.card h3{margin-bottom:6px;font-size:17px}
.card p{color:var(--muted);font-size:15px;margin:0}
.card p+p{margin-top:9px}
.text-link{font-weight:600}

/* ---------- icon tile grid (category entry points) ---------- */
.tiles{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:8px}
.tile{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:9px;text-align:center;padding:20px 14px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;color:var(--ink);transition:.12s ease}
.tile:hover{border-color:var(--accent);color:var(--accent-ink);text-decoration:none}
.tile svg{width:34px;height:34px;stroke:currentColor;fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;color:var(--accent)}
.tile:hover svg{color:var(--accent-ink)}
.tile b{font-size:14px;font-weight:600;letter-spacing:-.01em;line-height:1.3}
.tile small{font-size:12px;color:var(--muted-2);font-weight:400}

/* ---------- popular calculator cards (3 col, dense link lists) ---------- */
.cat-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.cat-card{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:16px 16px 12px;display:flex;flex-direction:column}
.cat-card-head{display:flex;align-items:center;gap:9px;padding-bottom:11px;border-bottom:1px solid var(--line-2)}
.cat-card-head svg{width:20px;height:20px;stroke:var(--accent);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex:0 0 auto}
.cat-card-head h3{font-size:15.5px;font-weight:700;margin:0;letter-spacing:-.01em}
.cat-list{list-style:none;margin:0;padding:8px 0 0;flex:1}
.cat-list li{border-bottom:1px solid var(--line-2)}
.cat-list li:last-child{border-bottom:0}
.cat-list a{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:9px 2px;font-size:14.5px;color:var(--link);line-height:1.35}
.cat-list a:after{content:"›";color:var(--muted-2);font-size:16px;flex:0 0 auto}
.cat-list a:hover{text-decoration:none;color:var(--accent-ink)}
.cat-list a:hover:after{color:var(--accent-ink)}
.cat-more{display:block;text-align:center;margin-top:12px;padding:8px;border:1px solid var(--line);border-radius:var(--radius-sm);font-size:13.5px;font-weight:600;color:var(--ink-2)}
.cat-more:hover{background:var(--band);text-decoration:none}

/* ---------- feature list (artefacts of the site) ---------- */
.feature-cols{display:grid;grid-template-columns:repeat(2,1fr);gap:26px 34px}
.feature h3{font-size:16px;margin-bottom:5px}
.feature p{margin:0;color:var(--muted);font-size:14.8px}
.feature code{background:var(--band-2);border:1px solid var(--line-2);border-radius:4px;padding:1px 5px;font-size:13.5px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}

/* ---------- legacy tool index classes ---------- */
.tool-hero{padding:26px 0 6px}
.tool-hero h1{font-size:clamp(26px,3vw,36px)}
.tool-hero p:not(.eyebrow){max-width:760px;color:var(--muted);font-size:16px;margin:12px 0 0}
.tools-index{padding:14px 0 52px}
.tool-group{padding:18px;margin-bottom:14px}
.tool-group-head{display:flex;justify-content:space-between;align-items:end;gap:16px;padding:0 2px 12px;border-bottom:1px solid var(--line-2)}
.tool-group-head h2{font-size:19px}
.tool-group-head p{margin:4px 0 0;color:var(--muted);font-size:14px}
.badge-count{flex:0 0 auto;padding:3px 9px;border-radius:99px;background:var(--band-2);color:var(--muted);font-size:11.5px;font-weight:700}
.tool-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
.tool-card{display:block;padding:15px;transition:.12s ease}
.tool-card:hover{border-color:var(--accent);text-decoration:none}
.tool-card-top{display:none}
.tool-card h3{font-size:15.5px;margin:0 0 5px;letter-spacing:-.01em}
.tool-card p{margin:0;color:var(--muted);font-size:14px}
.tool-card .tag{display:inline-block;margin-top:9px;color:var(--muted-2);font-size:11px;font-weight:700;letter-spacing:.03em;text-transform:uppercase}
.featured-tool{border-color:#e8bda4;background:#fffaf7}
.tool-icon{display:none}
.tool-arrow{display:none}
.tools-note{margin-top:14px;padding:14px 16px;border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:var(--radius);background:var(--band);font-size:14.5px;color:var(--muted)}
.tools-note p{margin:0}

/* ---------- article / prose ---------- */
.prose{font-size:16.5px;color:var(--ink-2)}
.prose h2{margin:34px 0 12px;padding-top:22px;border-top:1px solid var(--line-2);font-size:22px;scroll-margin-top:76px}
.prose h2:first-child{margin-top:0;padding-top:0;border-top:0}
.prose h3{margin:22px 0 8px;font-size:17px}
.prose p{margin:0 0 15px;color:var(--ink-2)}
.prose ul,.prose ol{padding-left:22px;margin:0 0 15px;color:var(--ink-2)}
.prose li{margin:7px 0}
.prose strong{color:var(--ink)}

.byline{display:flex;flex-wrap:wrap;gap:6px 14px;align-items:center;padding:11px 0;border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2);margin:18px 0 26px;font-size:13.5px;color:var(--muted)}
.byline b{color:var(--ink-2);font-weight:600}
.byline span{display:inline-flex;align-items:center;gap:5px}

.toc{border:1px solid var(--line);border-radius:var(--radius);background:var(--band);padding:14px 18px;margin:0 0 28px}
.toc b{display:block;font-size:13px;letter-spacing:.03em;text-transform:uppercase;color:var(--muted-2);margin-bottom:7px}
.toc ol{margin:0;padding-left:20px;columns:2;column-gap:26px}
.toc li{margin:4px 0;font-size:14.5px}

.formula{padding:14px 16px;border-radius:var(--radius);background:var(--band);border:1px solid var(--line);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;line-height:1.75;color:var(--ink-2);margin:0 0 16px}
.data-table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:14.5px}
.data-table th,.data-table td{border:1px solid var(--line);padding:8px 11px;text-align:left}
.data-table th{background:var(--band);font-weight:700;font-size:13.5px}
.data-table td.num{text-align:right;font-variant-numeric:tabular-nums}

.example-list{display:grid;gap:0;margin:14px 0 18px;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.example-row{display:flex;justify-content:space-between;gap:14px;padding:10px 14px;border-bottom:1px solid var(--line-2);background:#fff;font-size:14.5px;color:var(--muted)}
.example-row:nth-child(even){background:var(--band)}
.example-row:last-child{border-bottom:0}
.example-row strong{color:var(--ink);font-variant-numeric:tabular-nums}

.faq{margin-top:8px}
.faq details{border-bottom:1px solid var(--line-2);padding:14px 0}
.faq summary{font-weight:700;cursor:pointer;font-size:16px;list-style:none;color:var(--ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";float:right;color:var(--accent);font-weight:700}
.faq details[open] summary:after{content:"–"}
.faq p{font-size:15.5px;margin:10px 0 0;color:var(--ink-2)}

.note{font-size:13px;color:var(--muted-2);line-height:1.6}
.breadcrumb{padding:16px 0 4px;color:var(--muted-2);font-size:13px}
.breadcrumb a{color:var(--muted)}
.breadcrumb span{margin:0 6px;color:#c3c9d2}

/* ---------- ad slot (reserved, unmonetised until approved) ---------- */
.ad-slot{margin:22px 0;min-height:100px;border:1px dashed var(--line);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;color:#b9bfc8;font-size:12px;letter-spacing:.04em;text-transform:uppercase;background:repeating-linear-gradient(45deg,#fbfbfc,#fbfbfc 10px,#f7f8fa 10px,#f7f8fa 20px)}

/* ---------- related links ---------- */
.related{margin-top:30px;padding-top:20px;border-top:1px solid var(--line-2)}
.related h2{font-size:17px;margin-bottom:10px}
.related ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,1fr);gap:6px 24px}
.related li{font-size:15px}

/* ---------- calculator ---------- */
.calculator-page{padding:0 0 56px}
.calc-shell{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(310px,.85fr);gap:18px;align-items:start;margin-top:18px}
.calc-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.input-card{padding:20px}
.input-head{display:flex;justify-content:space-between;align-items:start;gap:16px;margin-bottom:16px;padding-bottom:14px;border-bottom:1px solid var(--line-2)}
.input-head h2{font-size:18px;margin:0}
.input-head p{margin:4px 0 0;color:var(--muted);font-size:13.5px}
.live-badge{padding:4px 8px;border-radius:99px;background:var(--ok-soft);color:var(--ok);font-size:11px;font-weight:700;white-space:nowrap;flex:0 0 auto;border:1px solid #bbf7d0}
.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.field label{display:block;font-size:13px;font-weight:700;margin-bottom:5px;color:var(--ink-2)}
.input-wrap{position:relative}
.input-wrap input,.input-wrap select{width:100%;height:42px;border:1px solid var(--line);border-radius:var(--radius-sm);padding:0 46px 0 12px;background:#fff;outline:none;color:var(--ink);font-size:15px;-webkit-appearance:none;appearance:none}
.input-wrap select{padding-right:32px;background:#fff}
.input-wrap input:focus,.input-wrap select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.input-unit{position:absolute;right:12px;top:50%;transform:translateY(-50%);color:var(--muted-2);font-size:12px;font-weight:700;pointer-events:none}
.field small{display:block;color:var(--muted-2);margin-top:4px;font-size:12.5px;line-height:1.45}
.calc-actions{margin-top:18px;padding-top:16px;border-top:1px solid var(--line-2)}
.calc-actions .btn{flex:1}
.err{color:var(--bad);font-size:13px;min-height:18px;margin-top:8px}

.result-card{padding:20px;position:sticky;top:76px;background:var(--band);border-color:var(--line)}
.result-kicker{font-size:12px;color:var(--muted-2);font-weight:700;letter-spacing:.04em;text-transform:uppercase}
.result-main{margin-top:6px}
.result-main span{display:block;color:var(--muted);font-size:13px}
.result-main strong{display:block;font-size:40px;line-height:1.08;letter-spacing:-.035em;margin-top:4px;color:var(--ink);font-variant-numeric:tabular-nums}
.result-sub{color:var(--muted-2);font-size:12.5px;margin-top:5px}
.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:1px;margin-top:18px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden}
.metric{padding:11px 12px;background:#fff}
.metric span{display:block;color:var(--muted-2);font-size:11.5px}
.metric strong{display:block;margin-top:3px;font-size:16px;color:var(--ink);font-variant-numeric:tabular-nums}
.result-note{margin-top:12px;padding:11px 12px;border-radius:var(--radius-sm);background:#fff;border:1px solid var(--line);color:var(--muted);font-size:12.5px;line-height:1.55}
.result-actions{display:flex;gap:8px;margin-top:14px}
.result-actions button{flex:1;border:1px solid var(--line);background:#fff;color:var(--ink-2);padding:9px;border-radius:var(--radius-sm);cursor:pointer;font-weight:600;font-size:13.5px}
.result-actions button:hover{background:var(--band-2)}

/* content + sidebar */
.content-section{padding-bottom:52px}
.content-grid{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:34px;align-items:start}
.info-card{background:transparent;border:0;border-radius:0;padding:0}
.info-card h2{font-size:22px;margin:0 0 12px;scroll-margin-top:76px;padding-top:20px;border-top:1px solid var(--line-2)}
.info-card h2:first-child{padding-top:0;border-top:0}
.info-card h3{font-size:17px;margin:22px 0 8px}
.info-card p,.info-card li{color:var(--ink-2);font-size:16px}
.info-card p{margin:0 0 15px}
.info-card ul,.info-card ol{padding-left:22px;margin:0 0 15px}
.side-col{display:grid;gap:16px;position:sticky;top:76px}
.side-card{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:16px}
.side-card h3{font-size:15px;margin:0 0 9px}
.side-card ul{list-style:none;margin:0;padding:0}
.side-card li{border-bottom:1px solid var(--line-2);font-size:14.5px}
.side-card li:last-child{border-bottom:0}
.side-card li a{display:block;padding:8px 0}
.pro-cta{padding:16px;border:1px solid var(--line);border-radius:var(--radius);background:var(--band)}
.pro-cta h3{font-size:15.5px;margin:0 0 6px}
.pro-cta p{font-size:14px;color:var(--muted);margin:0 0 12px}
.pro-cta a.btn{width:100%;font-size:14px;padding:9px 12px}
.list-check{list-style:none;padding:0;margin:12px 0 0}
.list-check li{position:relative;padding-left:24px;margin:8px 0;color:var(--muted);font-size:15px}
.list-check li:before{content:"";position:absolute;left:0;top:8px;width:7px;height:7px;border-radius:2px;background:var(--accent);opacity:.55}

/* ---------- photos ---------- */
.photo-band{padding:0 0 4px}
.photo-band-inner{position:relative;margin:0;border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);background:var(--band-2)}
.photo-band img{display:block;width:100%;height:min(40vw,300px);object-fit:cover;object-position:center 42%}
.photo-band-cap{position:absolute;left:0;right:0;bottom:0;padding:60px 22px 16px;color:#fff;background:linear-gradient(0deg,rgba(9,12,17,.94),rgba(9,12,17,.72) 34%,rgba(9,12,17,.36) 64%,rgba(9,12,17,0) 100%);text-shadow:0 1px 3px rgba(0,0,0,.55)}
.photo-band-cap strong{display:block;font-size:15.5px;letter-spacing:-.01em}
.photo-band-cap span{display:block;font-size:12.5px;color:#cdd3db;margin-top:4px;max-width:660px}
.photo-figure{margin:0}
.photo-figure img{display:block;width:100%;border-radius:var(--radius);border:1px solid var(--line);background:var(--band-2)}
.side-col .photo-figure img{height:190px;object-fit:cover}
.photo-figure figcaption{margin-top:8px;font-size:12.5px;color:var(--muted-2);line-height:1.5}
.credit{display:block;margin-top:4px;font-size:11.5px;color:#8f97a3;line-height:1.45}
.photo-band-cap .credit{color:#aab2bf}
.prose-photo{margin:0 0 22px}
.prose-photo img{height:290px;object-fit:cover}
.photo-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:22px}
.photo-grid figure{margin:0}
.photo-grid img{display:block;width:100%;height:230px;object-fit:cover;border-radius:var(--radius);border:1px solid var(--line);background:var(--band-2)}
.photo-grid figcaption{margin-top:8px;font-size:12.5px;color:var(--muted-2);line-height:1.5}
.photo-credits{margin-top:20px;padding-top:14px;border-top:1px solid var(--line-2);font-size:12.5px;color:var(--muted-2);line-height:1.7}
.photo-credits strong{display:block;color:var(--ink-2);font-size:13.5px;margin-bottom:5px}

/* ---------- footer ---------- */
.site-footer{margin-top:44px;padding:34px 0 40px;border-top:1px solid var(--line);background:var(--band);font-size:14px;color:var(--muted)}
.footer-cols{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:26px}
.footer-cols h4{font-size:13px;letter-spacing:.04em;text-transform:uppercase;color:var(--muted-2);margin:0 0 9px}
.footer-cols ul{list-style:none;margin:0;padding:0}
.footer-cols li{margin:6px 0}
.footer-cols a{color:var(--ink-2)}
.footer-about p{margin:0 0 10px;font-size:13.5px;line-height:1.65}
.footer-wrap{display:flex;justify-content:space-between;gap:22px;flex-wrap:wrap;color:var(--muted-2);font-size:13px}
.footer-links{display:flex;gap:16px;flex-wrap:wrap}
.footer-wrap a:hover{color:var(--ink)}
.disclosure{max-width:920px;margin-top:16px;padding-top:14px;border-top:1px solid var(--line);font-size:12.5px;color:var(--muted-2);line-height:1.6}

/* ---------- utilities ---------- */
.stack-lg>*+*{margin-top:18px}
.muted{color:var(--muted)}
.mt-0{margin-top:0}
.center{text-align:center}
.skip{position:absolute;left:-9999px}

/* ---------- responsive ---------- */
@media(max-width:1080px){
  .cat-cards{grid-template-columns:repeat(2,1fr)}
  .footer-cols{grid-template-columns:1fr 1fr}
}
@media(max-width:980px){
  .nav a:not(.nav-cta){display:none}
  .nav-dd{display:none}
  .site-search{max-width:none;flex:1 1 auto}
  .hero-grid,.calc-shell,.content-grid{grid-template-columns:1fr}
  .result-card,.side-col{position:static}
  .content-grid{gap:26px}
}

/* grid and flex items default to min-width:auto, so one wide table inside a card
   stretches the whole track past the phone viewport. Let the items shrink and
   give the table its own scroll box instead. */
.content-grid>*,.calc-shell>*,.hero-grid>*{min-width:0}
.info-card,.calc-card,.side-card,.result-card{max-width:100%}
.data-table{max-width:100%}
@media(max-width:760px){
  .tool-grid,.grid-3,.grid-2,.feature-cols,.cat-cards{grid-template-columns:1fr}
  .tiles{grid-template-columns:repeat(2,1fr)}
  .toc ol{columns:1}
  .related ul{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:1fr}
  .nav-dd-panel{grid-template-columns:1fr;width:260px}
  .data-table{display:block;overflow-x:auto;-webkit-overflow-scrolling:touch;margin-bottom:16px}
  .data-table th,.data-table td{padding:7px 9px;font-size:13.5px;white-space:normal}
}

/* a table wider than the phone viewport scrolls inside its own box rather than
   pushing the whole page sideways */
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
@media(max-width:640px){
  .container,.container-narrow{width:min(100% - 26px,var(--container))}
  /* the header search was being squeezed to ~84px by the nowrap brand, which is
     too narrow to show its own placeholder — drop it onto a full-width row */
  .nav-wrap{flex-wrap:wrap;gap:9px;padding-top:9px;padding-bottom:9px}
  .site-search{order:3;flex:1 1 100%;max-width:none;margin:0}
  .brand{font-size:14.5px}
  .hero{padding:28px 0 22px}
  h1{font-size:30px}
  h2{font-size:21px}
  .section{padding:34px 0}
  .hero-copy,.hero-sub{font-size:16px}
  .field-grid,.result-grid{grid-template-columns:1fr}
  .input-card,.card,.side-card{padding:16px}
  .result-card{padding:17px}
  .result-main strong{font-size:34px}
  .tool-group-head{flex-direction:column;align-items:start}
  .photo-band img{height:200px}
  .photo-band-cap{padding:34px 15px 13px}
  .photo-grid{grid-template-columns:1fr}
  .photo-grid img{height:200px}
}