:root{--bg:#fbfaf7;--surface:#fff;--ink:#1d2433;--muted:#5b6475;--line:#e3e1db;--accent:#0f766e;--accent-soft:#d9f0ec;--warm:#c2410c;--radius:12px;--measure:46rem;
--serif:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;--sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
@media (prefers-color-scheme:dark){:root{--bg:#14171d;--surface:#1b1f27;--ink:#e8e6e1;--muted:#a3a9b5;--line:#2c313b;--accent:#5eead4;--accent-soft:#12302d;--warm:#fb923c}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:1.0625rem/1.65 var(--sans)}
a{color:var(--accent);text-underline-offset:.15em}
a:hover{text-decoration-thickness:2px}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:var(--measure);margin:0 auto;padding:0 1rem}
.skip{position:absolute;left:-999px}.skip:focus{left:1rem;top:1rem;background:var(--surface);padding:.5rem 1rem;z-index:9}
.site-header{border-bottom:1px solid var(--line);background:var(--surface)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:3.5rem;flex-wrap:wrap}
.brand{font:700 1.35rem/1 var(--serif);color:var(--ink);text-decoration:none;letter-spacing:-.01em}.brand span{color:var(--accent)}
.site-header nav{display:flex;gap:1.1rem;font-size:.95rem}.site-header nav a{color:var(--muted);text-decoration:none}.site-header nav a:hover{color:var(--ink)}
main{padding:1.5rem 1rem 3rem}
h1,h2,h3{font-family:var(--serif);line-height:1.2;letter-spacing:-.01em}
h1{font-size:clamp(1.9rem,4.5vw,2.6rem);margin:.4rem 0 .6rem}
h2{font-size:1.55rem;margin:2.4rem 0 .6rem;padding-top:.4rem}
h3{font-size:1.2rem;margin:1.6rem 0 .4rem}
.crumbs{font-size:.88rem;color:var(--muted)}.crumbs a{color:var(--muted)}
.byline{font-size:.9rem;color:var(--muted);margin:0 0 1.2rem}
.answer{font-size:1.12rem;background:var(--accent-soft);border-left:4px solid var(--accent);padding:1rem 1.2rem;border-radius:0 var(--radius) var(--radius) 0;margin:0 0 1.2rem}
.lead{font-size:1.15rem;color:var(--muted)}
.play-cta{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem 1rem;margin:0 0 1.5rem}
.play-cta span{font-size:.85rem;color:var(--muted)}
.btn{display:inline-block;background:var(--accent);color:var(--bg);padding:.65rem 1.1rem;border-radius:999px;font-weight:600;text-decoration:none}
.btn:hover{filter:brightness(1.08)}
.guides{border:1px solid var(--line);background:var(--surface);border-radius:var(--radius);padding:.9rem 1.2rem;margin:1.5rem 0}
.guides h2{font-size:1.05rem;margin:0 0 .4rem;padding:0;font-family:var(--sans)}
.guides ul{display:flex;flex-wrap:wrap;gap:.3rem 1.2rem;list-style:none;padding:0;margin:0}
.guides a[aria-current]{color:var(--ink);font-weight:600;text-decoration:none}
.fig{margin:1.8rem 0}.fig img{border:1px solid var(--line);border-radius:var(--radius);background:#fbfaf7}
figcaption{font-size:.9rem;color:var(--muted);margin-top:.5rem}
.credit{display:block;font-size:.8rem}
table{width:100%;border-collapse:collapse;margin:1.2rem 0;font-size:.95rem;display:block;overflow-x:auto}
th,td{text-align:left;padding:.55rem .7rem;border-bottom:1px solid var(--line);vertical-align:top}
th{font-weight:600;background:var(--surface)}
.back{font-size:.95rem;color:var(--muted)}
.faq .qa{border-top:1px solid var(--line);padding:.2rem 0}.faq h3{font-size:1.05rem;font-family:var(--sans);margin:.8rem 0 .2rem}.faq p{margin:0 0 .8rem}
.sources ul,.related ul{padding-left:1.2rem}.sources{font-size:.92rem}
.videos .video{margin:1.2rem 0}
.video button{position:relative;display:block;width:100%;max-width:640px;padding:0;border:0;border-radius:var(--radius);overflow:hidden;cursor:pointer;background:#000}
.video .play{position:absolute;inset:0;margin:auto;width:4rem;height:4rem;border-radius:50%;background:rgba(0,0,0,.7);color:#fff;font-size:1.6rem;display:grid;place-items:center}
.video iframe{width:100%;max-width:640px;aspect-ratio:16/9;border:0;border-radius:var(--radius)}
.video-credit{font-size:.85rem;color:var(--muted)}
.hero{padding:1rem 0 .5rem}
.cards{list-style:none;padding:0;display:grid;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(16rem,1fr))}
.card a{display:flex;flex-direction:column;gap:.3rem;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:.8rem;text-decoration:none;color:var(--ink);height:100%}
.card a:hover{border-color:var(--accent)}.card img{border-radius:8px}
.card .tag{font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;color:var(--accent);font-weight:600;margin-top:.4rem}
.card strong{font-family:var(--serif);font-size:1.2rem}.card span:last-child{font-size:.92rem;color:var(--muted)}
.list{padding-left:1.2rem}
.site-footer{border-top:1px solid var(--line);background:var(--surface);font-size:.9rem;color:var(--muted);padding:1.5rem 0}
.site-footer nav{display:flex;flex-wrap:wrap;gap:.4rem 1.1rem;margin:.6rem 0}
.small{font-size:.82rem}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.analytics-choice{position:fixed;bottom:1rem;right:1rem;width:min(26rem,calc(100% - 2rem));z-index:20;background:var(--bg);border:1px solid var(--line);border-radius:12px;box-shadow:0 4px 24px #0002;padding:1rem;font-size:.9rem}.analytics-choice[hidden],.privacy-settings[hidden]{display:none}.analytics-choice p{margin:0 0 .6rem}.analytics-choice div{display:flex;flex-wrap:wrap;gap:.6rem}.analytics-choice button,.privacy-settings{font:inherit;min-height:44px;padding:.5rem .8rem;background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:6px;cursor:pointer}
.toc,.task-picks{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:1rem 1.2rem;margin:1.3rem 0}
.toc ul,.task-picks ul{margin:.5rem 0 0;padding-left:1.2rem}.toc li,.task-picks li{margin:.45rem 0}
.toc{font-size:.95rem}.frame-source{display:inline-block;font-size:.86rem;padding:.25rem 0}
.evidence-note{font-size:.9rem;color:var(--muted);border-left:3px solid var(--line);padding:.5rem .8rem}
h2[id],h3[id]{scroll-margin-top:1rem}
/* Verified connection explorer */
.route-lab{border:1px solid var(--line);border-radius:16px;background:var(--surface);padding:1.2rem;margin:1.5rem 0}
.route-lab h3{font-size:1.65rem;margin:.3rem 0}.lab-eyebrow{font-size:.72rem;font-weight:750;letter-spacing:.09em;color:var(--accent);margin:0}
.lab-summary{padding:.7rem 1rem;border-radius:10px;background:var(--accent-soft)}.lab-summary p{margin:.2rem 0;font-size:.95rem}
.route-map{display:block;width:100%;max-height:430px;margin:.5rem auto;background:#eaf1f5;border-radius:12px}
.route-map path{fill:#d4dfdf;stroke:#607b81;stroke-width:1.5;vector-effect:non-scaling-stroke}.route-map g{cursor:pointer}.route-map text{font:600 17px system-ui;fill:#172d35;pointer-events:none;text-anchor:middle;paint-order:stroke;stroke:#eaf1f5;stroke-width:4px;stroke-linejoin:round}
.route-map .visited path{fill:#81c7b7}.route-map .current path{fill:#36a491;stroke:#124c44;stroke-width:3}.route-map g:hover path,.route-map g:focus-visible path{fill:#f0c66b;stroke:#453a19;stroke-width:3}
.country-buttons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.5rem}.route-lab button{font:600 .94rem/1.3 var(--sans);min-height:44px;padding:.7rem .8rem;border:1px solid var(--line);border-radius:8px;color:var(--ink);background:var(--bg);cursor:pointer}.route-lab button:hover{border-color:var(--accent)}.route-lab button.current{background:var(--accent-soft);border-color:var(--accent)}.route-lab button:disabled{opacity:.45;cursor:default}.lab-status{border-left:3px solid var(--accent);padding:.7rem .8rem;min-height:5rem;background:var(--bg);font-size:.95rem}.lab-actions{display:flex;gap:.5rem;flex-wrap:wrap}.lab-actions button:first-child{margin-right:auto}.route-lab .small{margin-bottom:0}.written-answer{padding:1rem;border:1px solid var(--line);border-radius:10px}.written-answer summary{cursor:pointer;font-weight:650}.written-answer p:last-child{margin-bottom:0}
@media(max-width:480px){.route-lab{padding:.8rem}.route-map{max-height:340px}.site-header nav{gap:.75rem}}