@font-face{font-family:"Rubik";src:url(/fonts/rubik.woff2) format("woff2");font-weight:400 700;font-display:swap}
:root{--ink:#0f2533;--muted:#4c6372;--pool:#0a6f97;--pool-dk:#075574;--shallow:#e8f4f9;--grille:#22343f;--line:#d5e5ed;--warn:#fff6e3;--warn-line:#efd9a8;--bg:#fff}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.65 "Rubik",system-ui,-apple-system,"Segoe UI",sans-serif}
a{color:var(--pool)}a:hover{color:var(--pool-dk)}
:focus-visible{outline:3px solid #f0a020;outline-offset:3px}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
header.site{border-bottom:1px solid var(--line);background:#fff}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 20px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);text-decoration:none}.brand svg{width:28px;height:28px}
nav.main{display:flex;gap:20px}nav.main a{color:var(--muted);text-decoration:none;font-size:.95rem}nav.main a:hover,nav.main a[aria-current]{color:var(--ink)}nav.main a[aria-current]{font-weight:600}

/* hero: the speaker grille is the button */
.hero{background:var(--shallow);border-bottom:1px solid var(--line);text-align:center;padding:36px 20px 40px}
.hero .breadcrumb{margin-bottom:6px}
h1{font-size:clamp(1.8rem,4.6vw,2.7rem);line-height:1.1;letter-spacing:-.02em;font-weight:700;margin:0 auto .3em;max-width:22em}
.hero-sub{color:var(--muted);font-size:1.08rem;margin:0 auto 30px;max-width:34em}
.tool{max-width:660px;margin:0 auto}
.go{position:relative;width:216px;height:216px;border-radius:50%;border:0;cursor:pointer;color:#fff;display:inline-flex;flex-direction:column;align-items:center;justify-content:center;margin:18px auto 28px;touch-action:manipulation;-webkit-tap-highlight-color:transparent;
  background:radial-gradient(circle,#0a161d 1.7px,transparent 2.3px) 0 0/12px 12px,var(--grille);
  box-shadow:0 0 0 9px #fff,0 0 0 10px var(--line),0 14px 34px rgba(10,111,151,.22);transition:transform .1s}
.go:active{transform:scale(.97)}
.go.on{background:radial-gradient(circle,#06384d 1.7px,transparent 2.3px) 0 0/12px 12px,var(--pool)}
.go-ring{position:absolute;inset:-22px;pointer-events:none}.go-ring svg{width:100%;height:100%;transform:rotate(-90deg);overflow:visible}
.go-ring circle{fill:none;stroke-width:3.5}.go-ring .track{stroke:transparent}.go-ring .bar{stroke:var(--pool);stroke-linecap:round;transition:stroke-dashoffset .1s linear}
.go:not(.on) .go-ring .bar{opacity:0}
.go-label{font-size:2.1rem;font-weight:700;position:relative;text-shadow:0 1px 6px rgba(0,0,0,.5)}
.go-sub{font-size:.95rem;position:relative;font-variant-numeric:tabular-nums;text-shadow:0 1px 4px rgba(0,0,0,.6)}
.scope{margin:0 0 22px}
.scope canvas{display:block;width:100%;height:96px;background:#fff;border:1px solid var(--line);border-radius:10px}
.scope figcaption{font-size:.88rem;color:var(--muted);margin-top:8px}
.prep{list-style:none;counter-reset:p;display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:0 0 22px;padding:0;text-align:left;font-size:.93rem;line-height:1.45}
.prep li{counter-increment:p;display:flex;gap:10px}
.prep li::before{content:counter(p);flex:none;width:24px;height:24px;border-radius:50%;background:var(--pool);color:#fff;font-weight:700;font-size:.82rem;display:grid;place-items:center;margin-top:1px}
.opts{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:12px 22px;text-align:left;padding:16px 0 0;border-top:1px solid var(--line);align-items:start}
fieldset{border:0;margin:0;padding:0}legend{font-weight:600;font-size:.9rem;margin-bottom:4px;padding:0}
fieldset label{display:block;font-size:.94rem}
.field{display:block;font-weight:600;font-size:.9rem}.field output{font-weight:400;color:var(--muted);margin-left:4px}
input[type=range]{width:100%;margin-top:10px;accent-color:var(--pool)}input[type=range]:disabled{opacity:.4}
select{width:100%;margin-top:6px;border:1px solid var(--line);border-radius:8px;padding:8px 10px;background:#fff;font:inherit;font-weight:400;color:var(--ink)}
.check{grid-column:1/-1;font-size:.94rem}.check.off{color:var(--muted);opacity:.7}
input[type=radio],input[type=checkbox]{accent-color:var(--pool)}
.status{margin:14px 0 0;font-size:.94rem;color:var(--muted);min-height:1.6em}

/* reading column */
.body,main.wrap{max-width:720px;margin:0 auto;padding:30px 20px 64px}
.body .lead{font-size:1.1rem}
.lead{color:var(--ink)}
.breadcrumb{font-size:.9rem;color:var(--muted)}
h2{font-size:1.5rem;line-height:1.25;letter-spacing:-.01em;margin:2em 0 .5em;font-weight:700}
h3{font-size:1.06rem;margin:1.4em 0 .25em;font-weight:600}
li{margin-bottom:.35em}
.note{background:var(--warn);border:1px solid var(--warn-line);border-radius:10px;padding:12px 16px;margin:0 0 8px}.note p{margin:0}
footer.site{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}
footer.site .wrap{display:flex;gap:16px;flex-wrap:wrap;padding:22px 20px}
@media (max-width:680px){
  .hero{padding:24px 16px 30px}
  .go{width:184px;height:184px}
  .prep{grid-template-columns:1fr}
  .opts{grid-template-columns:1fr}
  nav.main{gap:14px}
  .body,main.wrap{padding:24px 16px 48px}
}
@media (prefers-reduced-motion:reduce){.go,.go-ring .bar{transition:none}}