.withside{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:28px;align-items:start}.side{background:#fff;border:1px solid var(--line);border-top:5px solid var(--teal2);border-radius:12px;padding:16px 18px;font-size:15.5px;line-height:1.5;position:sticky;top:70px;max-height:calc(100vh - 90px);overflow:auto}.side h3{margin:0 0 6px}.side h4{margin:14px 0 4px;color:var(--teal)}.side ul{padding-left:18px;margin:6px 0}.side li{margin:6px 0}@media(max-width:900px){.withside{grid-template-columns:minmax(0,1fr)}.side{position:static;max-height:none}}
:root{--bg:#f3f5f9;--card:#fff;--ink:#1a2233;--soft:#5b6578;--teal:#0e7490;--teal2:#22d3ee;--line:#d7dde8;--dark:#0b1f24;--red:#c0392b;--green:#2f855a}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:18px/1.6 'Source Sans 3',Arial,sans-serif}
a{color:#1d4ed8}a:hover{color:var(--red)}
.alert{background:var(--red);color:#fff;text-align:center;font-weight:700;font-size:15px;padding:6px 12px}
header.top{background:var(--dark);color:#fff;position:sticky;top:0;z-index:5}
.bar{max-width:1100px;margin:0 auto;padding:10px 16px;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.logo{font:700 22px 'Space Grotesk',Arial,sans-serif;color:#fff;text-decoration:none;letter-spacing:.3px}.logo b{color:var(--teal2)}
nav{display:flex;gap:4px;flex-wrap:wrap}nav a{color:#d3e2ea;text-decoration:none;padding:6px 10px;border-radius:6px;font-weight:600;font-size:16px}
nav a:hover,nav a.on{background:#1c2f57;color:#fff}
main{max-width:1100px;margin:0 auto;padding:0 16px 40px}
.hero{padding:42px 0 18px}.kick{color:var(--teal);font-weight:700;letter-spacing:.12em;text-transform:uppercase;font-size:14px}
h1{font:700 44px/1.1 'Space Grotesk',Arial,sans-serif;margin:6px 0 6px}h2{font:700 29px/1.2 'Space Grotesk',Arial,sans-serif;margin:46px 0 12px}
h3{font:700 21px/1.3 'Space Grotesk',Arial,sans-serif;margin:0 0 6px}
.by{color:var(--soft);font-weight:600}.lead{font-size:21px;color:#2c3e48;max-width:820px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;text-decoration:none;color:var(--ink);display:block}
a.card:hover{border-color:var(--teal2);box-shadow:0 4px 14px rgba(0,0,0,.06)}
.card p{margin:4px 0 0;color:var(--soft);font-size:16.5px}
.tw{overflow-x:auto;margin:6px 0 4px;border-radius:10px;border:1px solid var(--line)}
table{border-collapse:collapse;width:100%;background:#fff;font-size:16.5px}
th{background:var(--dark);color:#fff;text-align:left;padding:10px 12px;font-weight:700}
td{padding:9px 12px;border-top:1px solid var(--line);vertical-align:top}tr:nth-child(even) td{background:#f5f8fd}td:first-child{font-weight:700}
.small{font-size:15px;color:var(--soft)}
figure{margin:18px 0}figcaption{font-size:15.5px;color:var(--soft);margin-top:6px}
.note{background:#eaf2ff;border:1px solid #bcd0f5;border-radius:12px;padding:14px 18px;margin:18px 0}
.warn{background:#fdf0ee;border:1px solid #efc9c3;border-radius:12px;padding:14px 18px;margin:18px 0}
ol.steps{padding-left:22px}ol.steps li{margin:6px 0}
.toc{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}.toc a{background:#fff;border:1px solid var(--line);padding:5px 12px;border-radius:999px;text-decoration:none;font-weight:600;font-size:15.5px}
.btn{display:inline-block;background:var(--teal);color:#fff;border:0;border-radius:8px;padding:10px 18px;font:700 16px 'Source Sans 3',Arial,sans-serif;text-decoration:none;cursor:pointer}.btn.alt{background:#3a4a55}a.btn:hover{color:#fff;opacity:.92}
footer{background:var(--dark);color:#cfdbe2;margin-top:40px}footer .in{max-width:1100px;margin:0 auto;padding:28px 16px}
footer a{color:#7cc8f8}footer .grid .card{background:#13244a;border-color:#22396b;color:#cfdbe2}footer .card p{color:#a9bccb}
.q{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:12px 0}.q h3{font-size:18px;margin-bottom:8px}.q .cat{font-size:13px;color:var(--teal);font-weight:700;text-transform:uppercase;letter-spacing:.08em}
.q label{display:block;padding:8px 10px;border:1px solid var(--line);border-radius:8px;margin:6px 0;cursor:pointer}.q label:hover{background:#f0f8f7}.q input{margin-right:8px}
.q label.ok{background:#e6f4ea;border-color:#2f855a}.q label.bad{background:#fbe9e6;border-color:#c0392b}.q .ex{margin-top:8px;font-size:16px}
#result{display:none}#nm{padding:9px;border:1px solid #bbb;border-radius:8px;font-size:16px;width:260px;max-width:100%}
#cert{display:none;border:6px double #0f766e;background:#fbfffe;padding:34px;text-align:center;margin:24px 0;border-radius:6px}#cert h2{margin:10px 0}#cert .nm{font:700 34px 'Space Grotesk',Arial,sans-serif;margin:10px 0;border-bottom:2px solid #ccc;display:inline-block;padding:0 30px}
.fc{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px}.flip{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;text-align:left;font:inherit;cursor:pointer;min-height:120px}
.flip b{display:block}.flip i{display:block;color:var(--soft);font-size:14px;margin-top:8px}.flip span{display:none;margin-top:8px;color:var(--green);font-weight:600}.flip.on span{display:block}.flip.on i{display:none}
@media print{header.top,.alert,footer,.noprint,#qs,#result,.hero,.toc{display:none!important}#cert{display:block!important;border-width:8px}body{background:#fff}}
@media(max-width:640px){header.top{position:static}nav a{padding:3px 7px;font-size:15px}.hero{padding-top:24px}figure{overflow-x:auto;-webkit-overflow-scrolling:touch}figure svg{min-width:720px}figure figcaption::before{content:'Swipe sideways to see the whole picture. ';font-weight:600}body{font-size:17px}h1{font-size:34px}h2{font-size:25px}.lead{font-size:19px}table{font-size:15px}th,td{padding:8px}}