/* Signal Check (@SignalCheckRae) v2 redesign. Dark, high-contrast, signal motif. System fonts, no external assets.
   Contrast (AA): text #e8eef3 / muted #a7b4c0 / accent #5ee7f7 on #070a10 all > 7:1; button text #04121a on #5ee7f7 > 12:1. */
:root{--bg:#070a10;--bg2:#0b1018;--card:#0e1520;--card2:#121b28;--line:#1f2a3a;--line2:#2b3a50;--ink:#e8eef3;--muted:#a7b4c0;
 --cy:#5ee7f7;--cy2:#22d3ee;--vi:#a78bfa;--warn:#fbbf24;--warn-bg:#211a08;--r:16px;
 --font:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;color-scheme:dark;scroll-behavior:smooth}
body{margin:0;font:17px/1.6 var(--font);color:var(--ink);background:var(--bg);overflow-x:hidden}
a{color:var(--cy);text-underline-offset:3px}a:hover{color:#fff}
h1,h2,h3{line-height:1.15;letter-spacing:-.02em}
img{max-width:100%;height:auto}
.wrap{max-width:1140px;margin:0 auto;padding:0 20px}
.sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
:focus-visible{outline:3px solid var(--cy);outline-offset:3px;border-radius:8px}
main:focus{outline:none}
.skip{position:absolute;left:12px;top:-60px;background:var(--cy);color:#04121a;padding:10px 14px;border-radius:8px;z-index:50;font-weight:800}.skip:focus{top:12px}
.ic-ext{width:14px;height:14px;margin-left:5px;vertical-align:-1px;flex:none}
.muted{color:var(--muted)}.small{font-size:14px}
kbd{font:600 12px/1 var(--mono);color:var(--muted);border:1px solid var(--line2);border-bottom-width:2px;border-radius:6px;padding:3px 6px;background:var(--bg2)}
/* ambient glow (fixed, decorative) */
.bg-glow{position:fixed;inset:-20vh -10vw auto;height:80vh;z-index:-1;pointer-events:none;
 background:radial-gradient(40% 50% at 20% 20%,rgba(34,211,238,.16),transparent 70%),radial-gradient(35% 45% at 85% 10%,rgba(167,139,250,.14),transparent 70%)}
/* header */
.top{position:sticky;top:0;z-index:20;background:rgba(7,10,16,.72);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:8px 14px;flex-wrap:wrap;min-height:62px;padding-top:8px;padding-bottom:8px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;text-decoration:none;color:var(--ink);font-size:18px;margin-right:auto}
.handle{font-weight:600;color:var(--muted);font-size:14px}
.logo{width:32px;height:32px;flex:none}
.top nav{display:flex;flex-wrap:wrap;gap:2px}
.top nav a{padding:8px 10px;border-radius:999px;text-decoration:none;color:var(--muted);font-weight:600;font-size:15px}
.top nav a:hover{color:#fff;background:var(--card)}.top nav a[aria-current]{color:#fff;background:var(--card2);box-shadow:inset 0 0 0 1px var(--line2)}
.kbtn{display:inline-flex;align-items:center;gap:8px;min-height:40px;padding:6px 8px 6px 12px;border-radius:999px;border:1px solid var(--line2);background:var(--card);color:var(--muted);font:inherit;font-size:15px;cursor:pointer}
.kbtn svg{width:16px;height:16px}.kbtn:hover{color:#fff;border-color:var(--cy2)}
/* hero */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);
 background:radial-gradient(60% 80% at 50% 0%,rgba(34,211,238,.10),transparent 70%),linear-gradient(180deg,var(--bg2),var(--bg))}
.hero-in{position:relative;padding-top:40px;padding-bottom:36px}
.hero h1{font-size:clamp(28px,4.6vw,48px);margin:0 0 12px;max-width:900px}
.hero .lede{margin:0;max-width:740px;color:var(--muted);font-size:clamp(16px,1.7vw,19px)}
.crumb{font-size:14px;margin-bottom:14px;color:var(--muted)}.crumb a{color:var(--ink)}
.hero-home .hero-in{padding-top:clamp(56px,10vw,120px);padding-bottom:clamp(120px,15vw,180px)}
.hero-home .lede,.hero-home h1{text-shadow:0 2px 18px rgba(7,10,16,.9)}
.hero-home h1{font-size:clamp(36px,7vw,76px);max-width:980px;letter-spacing:-.035em}
.sig{position:absolute;inset:0;width:100%;height:100%;display:block;pointer-events:none}
.grad{background:linear-gradient(90deg,var(--cy) 0%,#9be7ff 45%,var(--vi) 100%);-webkit-background-clip:text;background-clip:text;color:transparent;text-shadow:none}
.eyebrow{display:inline-flex;align-items:center;gap:8px;margin:0 0 18px;font-size:14px;font-weight:700;color:var(--ink);background:rgba(14,21,32,.8);border:1px solid var(--line2);padding:6px 12px;border-radius:999px}
.dot{width:8px;height:8px;border-radius:50%;background:var(--cy);box-shadow:0 0 0 0 rgba(94,231,247,.6);animation:ping 2s infinite}
@keyframes ping{0%{box-shadow:0 0 0 0 rgba(94,231,247,.55)}80%,100%{box-shadow:0 0 0 10px rgba(94,231,247,0)}}
.hero-cta{margin:26px 0 0;display:flex;gap:12px;flex-wrap:wrap}
.hero-hint{margin:18px 0 0;font-size:14px;color:var(--muted)}
/* buttons */
.btn{position:relative;display:inline-flex;align-items:center;gap:4px;min-height:46px;padding:11px 20px;border-radius:999px;background:var(--cy);color:#04121a;border:1px solid var(--cy);font-weight:800;text-decoration:none;margin:0 6px 6px 0;
 box-shadow:0 0 0 0 rgba(94,231,247,0),0 8px 30px -10px rgba(94,231,247,.6);transition:box-shadow .2s,background .2s,transform .2s cubic-bezier(.2,.8,.2,1)}
.btn:hover{background:#9af0fb;color:#04121a;box-shadow:0 0 0 4px rgba(94,231,247,.18),0 10px 36px -8px rgba(94,231,247,.7)}
.btn-ghost{background:rgba(14,21,32,.6);color:var(--ink);border-color:var(--line2);box-shadow:none}.btn-ghost:hover{background:var(--card2);color:#fff;border-color:var(--cy2)}
.linkbtn{background:none;border:0;color:var(--cy);font:inherit;text-decoration:underline;cursor:pointer;padding:0}
/* marquee */
.marquee{border-bottom:1px solid var(--line);overflow:hidden;background:var(--bg2);-webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
.mq-track{display:flex;width:max-content;animation:mq 40s linear infinite}
.marquee:hover .mq-track,.marquee:focus-within .mq-track{animation-play-state:paused}
.mq-track ul{display:flex;list-style:none;margin:0;padding:0}
.mq-track li a{display:inline-flex;align-items:center;gap:12px;padding:14px 22px;color:var(--muted);text-decoration:none;font-weight:700;font-size:15px;white-space:nowrap}
.mq-track li a::before{content:"";width:6px;height:6px;border-radius:50%;background:linear-gradient(var(--cy),var(--vi))}
.mq-track li a:hover{color:#fff}
@keyframes mq{to{transform:translateX(-50%)}}
/* how strip */
.how-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.how-list li{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px 18px;color:var(--muted);font-size:15px}
.how-list strong{display:block;color:var(--ink);font-size:17px}
.how-n{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;margin-bottom:8px;font:800 14px/1 var(--mono);color:#04121a;background:linear-gradient(135deg,var(--cy),var(--vi))}
/* sections, panels */
.section{padding-top:34px}.section>h2{font-size:clamp(24px,3vw,32px);margin:0 0 16px}
.panel{background:linear-gradient(180deg,var(--card),var(--bg2));border:1px solid var(--line);border-radius:var(--r);padding:22px 24px;margin:0 0 16px}
.panel h2{font-size:21px;margin:0 0 10px}.panel h2:not(:first-child){margin-top:22px}.panel p{margin:0 0 12px}.panel li{margin-bottom:6px}
.prose{max-width:860px;padding-top:28px}
.links{padding-left:20px;margin:0}
.toollist{list-style:none;padding:0;margin:0}
/* filter */
.filter{margin:0 0 18px}
.fq-wrap{position:relative;max-width:560px}
.fq-ic{position:absolute;left:14px;top:50%;width:18px;height:18px;transform:translateY(-50%);color:var(--muted)}
.filter input{width:100%;min-height:50px;padding:10px 14px 10px 42px;border-radius:14px;border:1px solid var(--line2);background:var(--card);color:var(--ink);font:inherit;font-size:16px}
.filter input::placeholder{color:#8696a4}
.filter input:focus{outline:none;border-color:var(--cy);box-shadow:0 0 0 4px rgba(94,231,247,.15)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chip{min-height:38px;padding:6px 12px;border-radius:999px;border:1px solid var(--line2);background:var(--card);color:var(--muted);font:inherit;font-size:14px;font-weight:700;cursor:pointer;transition:background .2s,color .2s,border-color .2s}
.chip .n{font:700 12px/1 var(--mono);opacity:.85;margin-left:2px}
.chip:hover{color:#fff;border-color:var(--cy2)}
.chip[aria-pressed=true]{background:rgba(94,231,247,.14);color:#fff;border-color:var(--cy)}
.fcount{margin:10px 0 0;font-size:14px;color:var(--muted);min-height:1.4em}
.empty{color:var(--muted)}
/* cards */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.card{--mx:50%;--my:50%;--rx:0deg;--ry:0deg;position:relative;border-radius:var(--r);background:var(--card);border:1px solid var(--line);
 transform:perspective(800px) rotateX(var(--rx)) rotateY(var(--ry));transition:transform .25s cubic-bezier(.2,.8,.2,1),border-color .25s,opacity .25s,box-shadow .25s}
.card::before{content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;opacity:0;transition:opacity .25s;
 background:radial-gradient(260px circle at var(--mx) var(--my),rgba(94,231,247,.16),transparent 60%)}
.card:hover,.card:focus-within{border-color:rgba(94,231,247,.55);box-shadow:0 18px 40px -20px rgba(34,211,238,.45)}
.card:hover::before,.card:focus-within::before{opacity:1}
.card.out{opacity:0;transform:scale(.96)}
.card-a{position:relative;display:flex;gap:14px;padding:12px;text-decoration:none;color:var(--ink);height:100%;border-radius:inherit}
.card-a:focus-visible{outline-offset:-3px}
.thumb{flex:none;width:86px;aspect-ratio:9/16;border-radius:10px;overflow:hidden;box-shadow:0 0 0 1px rgba(94,231,247,.35)}
.thumb img{display:block;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.card:hover .thumb img{transform:scale(1.06)}
.card-b{display:flex;flex-direction:column;gap:4px;min-width:0}
.card-cat{font:700 11px/1.3 var(--mono);text-transform:uppercase;letter-spacing:.06em;color:var(--cy)}
.card-tool{font-weight:800;font-size:19px;color:#fff}
.card-job{font-size:15px;line-height:1.45;color:var(--muted)}
.card-date{font-size:13px;color:#8d9cab;margin-top:auto}
/* tool page */
.tool{padding-top:28px}
.tool-grid{display:grid;grid-template-columns:minmax(0,320px) minmax(0,1fr);gap:24px;align-items:start;margin-bottom:16px}
.big{font-size:19px}
.steps{list-style:none;counter-reset:s;padding:0;margin:0 0 18px}
.steps li{counter-increment:s;position:relative;padding:4px 0 10px 44px;margin:0}
.steps li::before{content:counter(s);position:absolute;left:0;top:2px;width:30px;height:30px;border-radius:50%;display:grid;place-items:center;font:800 14px/1 var(--mono);color:#04121a;background:linear-gradient(135deg,var(--cy),var(--vi))}
.watch{background:var(--warn-bg);border:1px solid rgba(251,191,36,.45);border-radius:12px;padding:12px 14px;margin:0 0 14px}.watch p{margin:0}.watch strong{color:var(--warn)}
.take{font-weight:800;color:var(--cy)}
.aff-none{font-size:14px;color:var(--muted)}
.aff-label{display:inline-block;font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.05em;background:var(--warn);color:#1b1300;border-radius:6px;padding:2px 8px}
/* youtube facade: thumbnail fills its own rounded box; no solid frame behind it */
.yt{margin:0}
.yt-play{position:relative;display:block;aspect-ratio:9/16;max-width:320px;border-radius:var(--r);overflow:hidden;box-shadow:0 0 0 1px rgba(94,231,247,.4),0 24px 60px -24px rgba(34,211,238,.55)}
.yt-play img{display:block;width:100%;height:100%;object-fit:cover;transition:transform .5s}
.yt-play:hover img{transform:scale(1.04)}
.yt-ic{position:absolute;left:50%;top:50%;width:68px;height:48px;transform:translate(-50%,-50%);filter:drop-shadow(0 4px 12px rgba(0,0,0,.4));transition:transform .2s}
.yt-play:hover .yt-ic,.yt-play:focus-visible .yt-ic{transform:translate(-50%,-50%) scale(1.1)}
.yt iframe{display:block;width:100%;max-width:320px;aspect-ratio:9/16;border:0;border-radius:var(--r)}
.yt figcaption{max-width:320px;margin-top:10px;font-size:14px}
.yt-t{display:block;font-weight:700;margin-bottom:4px}
.yt-link{font-weight:700}
.yt-note{display:block;color:var(--muted);font-size:13px;margin-top:4px}
.panel .yt{margin-top:6px}
.soon{font-size:26px;font-weight:800}
/* reveal on scroll (added by JS only to below-the-fold elements) */
.rv{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s cubic-bezier(.2,.8,.2,1)}
.rv.in{opacity:1;transform:none}
/* command palette */
.cmdk{padding:0;border:0;background:transparent;width:min(640px,calc(100vw - 24px));max-height:none;margin:10vh auto auto;color:var(--ink)}
.cmdk::backdrop{background:rgba(3,6,10,.7);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}
.cmdk-box{background:var(--card);border:1px solid var(--line2);border-radius:18px;box-shadow:0 30px 80px -20px rgba(0,0,0,.8),0 0 0 1px rgba(94,231,247,.15);overflow:hidden}
.cmdk[open] .cmdk-box{animation:pop .18s cubic-bezier(.2,.8,.2,1)}
@keyframes pop{from{opacity:0;transform:translateY(-8px) scale(.98)}}
.cmdk-top{display:flex;align-items:center;gap:10px;padding:12px 14px;border-bottom:1px solid var(--line)}
.cmdk-top input{flex:1;min-width:0;min-height:44px;border:0;background:transparent;color:var(--ink);font:inherit;font-size:18px}
.cmdk-top input:focus{outline:none}
.cmdk-list{list-style:none;margin:0;padding:8px;max-height:min(56vh,420px);overflow:auto}
.cmdk-list li{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:10px;cursor:pointer}
.cmdk-list li[aria-selected=true]{background:rgba(94,231,247,.12);box-shadow:inset 0 0 0 1px rgba(94,231,247,.45)}
.cmdk-k{flex:none;font:700 11px/1 var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--cy);border:1px solid var(--line2);border-radius:6px;padding:4px 6px;min-width:62px;text-align:center}
.cmdk-t{display:block;font-weight:700}.cmdk-s{display:block;font-size:14px;color:var(--muted)}
.cmdk-none{color:var(--muted);padding:14px}
.cmdk-foot{display:flex;gap:16px;flex-wrap:wrap;margin:0;padding:10px 14px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.cmdk-foot kbd{margin-right:3px}
/* footer */
.foot{margin-top:40px;border-top:1px solid var(--line);background:var(--bg2);font-size:14px;color:var(--muted);padding:28px 0 36px}
.foot p{max-width:760px;margin:0 0 10px}.foot-brand{font-size:16px;font-weight:800;display:flex;align-items:center;gap:10px;color:var(--ink)}
.foot-links{list-style:none;padding:0;margin:14px 0 0;display:flex;flex-wrap:wrap;gap:6px 18px}.foot-links a{font-weight:700}
code{font-family:var(--mono);font-size:.92em;color:var(--cy)}
@media (max-width:860px){.how-list{grid-template-columns:1fr}}
@media (max-width:760px){
 .tool-grid{grid-template-columns:1fr}
 .yt-play,.yt iframe,.yt figcaption{max-width:290px;margin-left:auto;margin-right:auto}
 .yt figcaption{text-align:center}
}
@media (max-width:560px){
 body{font-size:16px}.wrap{padding:0 16px}
 .bar{min-height:56px}.top nav{order:3;width:100%;margin-left:-8px}.top nav a{padding:6px 9px;font-size:14px}
 .handle{display:none}.kbtn kbd{display:none}
 .grid{grid-template-columns:1fr}
 .panel{padding:18px}
 .cmdk{margin-top:4vh}
}
@media (hover:none){.card{transform:none}}
@media (prefers-reduced-motion:reduce){
 html{scroll-behavior:auto}
 *,*::before,*::after{animation:none!important;transition:none!important}
 .mq-track{width:auto;flex-wrap:wrap}.mq-track ul[aria-hidden]{display:none}.mq-track ul{flex-wrap:wrap;justify-content:center}
 .marquee{-webkit-mask-image:none;mask-image:none}
 .card{transform:none!important}.rv{opacity:1;transform:none}
}