/* GoodToSwim: mobile first, system fonts, WCAG AA contrast (text colours >= 4.5:1 on their backgrounds). */
:root{--ink:#14262c;--muted:#4d5f66;--brand:#0b5e78;--brand2:#0f7a99;--line:#cfe3ea;--bg:#f6fafb;--card:#fff;--warn:#9b2318;--note:#7a5400}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:17px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--brand2);text-underline-offset:2px}
a:hover{color:var(--brand)}
:focus-visible{outline:3px solid #f2a900;outline-offset:2px;border-radius:3px}
.wrap{max-width:820px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-9999px;top:0}.skip:focus{left:8px;top:8px;z-index:9;background:#fff;padding:8px 12px;border:2px solid var(--brand)}
.preview-banner{background:#fff1c7;color:#4a3a00;text-align:center;font-size:.82rem;padding:4px 8px}
.top{background:var(--card);border-bottom:1px solid var(--line)}
.top-in{display:flex;flex-direction:column;gap:6px;padding:10px 16px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--brand)}
.logo img{width:38px;height:38px}
.logo .name{font-weight:750;font-size:1.2rem;line-height:1.1}.logo .name b{color:var(--brand2);font-weight:750}
.logo .sub{display:block;font-size:.72rem;font-weight:500;color:var(--muted);letter-spacing:.04em;text-transform:uppercase}
.nav{display:flex;flex-wrap:wrap;gap:2px 16px;font-size:.95rem}
.nav a{text-decoration:none;padding:6px 0;color:var(--brand)}.nav a[aria-current]{font-weight:700;text-decoration:underline;text-underline-offset:5px}
main{padding:8px 16px 40px}
h1{font-size:1.65rem;line-height:1.2;color:var(--brand);margin:.7em 0 .35em}
h2{font-size:1.25rem;line-height:1.3;margin:1.7em 0 .4em}
h3{font-size:1.05rem;margin:1.2em 0 .3em}
.lead{font-size:1.06rem;color:#2b3e45}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:14px 0}
.card h2{margin-top:.2em}
/* calculator */
.calc fieldset{border:1px solid var(--line);border-radius:10px;margin:0 0 14px;padding:10px 12px 12px}
.calc legend{font-weight:700;padding:0 6px;color:var(--brand)}
.field{display:block;margin:8px 0;font-weight:600;font-size:.95rem}
.field input,.field select{display:block;width:100%;max-width:16rem;margin-top:4px;font:inherit;font-weight:400;padding:9px 10px;border:1px solid #8aa3ad;border-radius:8px;background:#fff;color:var(--ink)}
.opt{display:flex;align-items:flex-start;gap:8px;margin:6px 0;font-size:.97rem;cursor:pointer}
.opt input{width:20px;height:20px;margin:2px 0 0;flex:none;accent-color:var(--brand)}
.hint{font-size:.88rem;color:var(--muted);margin:4px 0}
.grid2{display:grid;grid-template-columns:1fr;gap:0 16px}
.sec-row{border-top:1px dashed var(--line);padding-top:6px;margin-top:6px}
.sec-row h4{margin:4px 0;font-size:.95rem}
.btn{display:inline-block;background:var(--brand);color:#fff;border:0;border-radius:9px;padding:11px 18px;font:inherit;font-weight:700;cursor:pointer;text-decoration:none}
.btn:hover{background:#094c61;color:#fff}
.btn-ghost{background:#e3f2f7;color:var(--brand)}.btn-ghost:hover{background:#d0eaf2;color:var(--brand)}
.msg{color:var(--warn);font-weight:600;min-height:1.2em}
.result{background:#eaf6fa;border:2px solid var(--brand2);border-radius:12px;padding:12px 16px;margin:14px 0}
.result[hidden],[hidden]{display:none!important}
.result .big{font-size:1.5rem;font-weight:800;color:var(--brand);margin:.1em 0}
.estimate{display:inline-block;background:#fff1c7;color:#4a3a00;border-radius:6px;padding:1px 8px;font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.04em}
.steps{font-size:.94rem;padding-left:1.3em}.steps li{margin:3px 0}
.notice{background:#fff7e0;border-left:4px solid #c98d00;color:#3d2c00;padding:8px 12px;margin:10px 0;font-size:.95rem}
.warn{background:#fdeeee;border-left:4px solid var(--warn);color:#4a0f09;padding:8px 12px;margin:10px 0;font-size:.95rem}
/* safety */
.safety{background:#fff;border:2px solid var(--warn);border-radius:12px;padding:4px 16px 10px;margin:18px 0}
.safety h2{margin:.6em 0 .3em;color:var(--warn);font-size:1.15rem}
.safety ul{padding-left:1.2em;margin:.3em 0}.safety li{margin:5px 0}
.safety summary{cursor:pointer;font-weight:600;color:var(--brand);padding:4px 0}
/* label illustrations (our own drawings, not label images) */
.labels{display:grid;grid-template-columns:1fr;gap:12px;margin:10px 0}
.label-ex{margin:0;border:2px solid #222;border-radius:4px;background:#fff;font-family:Arial,Helvetica,sans-serif;font-size:.86rem;color:#111;max-width:340px}
.label-ex .t{background:#222;color:#fff;font-weight:700;font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;padding:4px 8px}
.label-ex .box{padding:6px 8px}
.label-ex .h{font-weight:700;text-transform:uppercase;font-size:.75rem;border-bottom:1px solid #222;padding-bottom:2px;margin-bottom:4px}
.label-ex .ing{display:flex;justify-content:space-between;gap:10px;padding:1px 0}
.label-ex .ing span:last-child{font-weight:700}
.label-ex .tot{border-top:1px solid #222;margin-top:3px;padding-top:2px}
.label-ex .cap{font-size:.75rem;color:#444;padding:0 8px 6px}
/* tables */
table{border-collapse:collapse;width:100%;display:block;overflow-x:auto;font-size:.88rem;background:#fff;margin:8px 0}
th,td{border:1px solid var(--line);padding:5px 7px;text-align:left;vertical-align:top}
th{background:#eaf4f7}
td.num{text-align:right;white-space:nowrap}
.st-pass{color:#17643a}.st-source_conflict{color:#7a4d00}.st-fail{color:var(--warn)}
.small{font-size:.86rem;color:var(--muted)}
.foot{border-top:1px solid var(--line);background:var(--card);padding:12px 0 24px;font-size:.92rem}
.disclaimer{border-top:1px solid var(--line);padding-top:10px;margin-top:26px}
@media (min-width:640px){
 h1{font-size:2rem}
 .top-in{flex-direction:row;align-items:center;justify-content:space-between}
 .grid2{grid-template-columns:1fr 1fr}
 .labels{grid-template-columns:1fr 1fr}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
/* N9: main menu on one line from 1024 px */
@media (min-width:1024px){.top-in{max-width:1080px}.nav{flex-wrap:nowrap;gap:0 22px}.nav a{white-space:nowrap}}
/* N10: fixed ad slots (only rendered when AdSense is on) */
.ad-slot{margin:24px 0;min-height:120px;text-align:center}
.ad-slot .ad-label{display:block;font-size:.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:4px}
.linkbtn{background:none;border:0;padding:0;color:var(--brand);text-decoration:underline;cursor:pointer;font:inherit}