:root{--y:#facc15;--c:#22d3ee;--bg1:#1e3a8a;--bg2:#0b1020;--card:#16224a;--txt:#f1f5f9;--mut:#cbd5e1;--r:16px}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;font-size:18px;line-height:1.6;color:var(--txt);background:radial-gradient(circle at 30% 0%,#2546a8,var(--bg1) 35%,var(--bg2) 100%) fixed;min-height:100vh}
a{color:var(--c)}a:hover{color:var(--y)}img,svg{max-width:100%}
h1,h2,h3{color:var(--y);line-height:1.2}h1{font-size:clamp(2rem,5vw,3.2rem);margin:.3em 0}h2{font-size:clamp(1.5rem,3.5vw,2.1rem)}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:10px;top:10px;background:var(--y);color:#000;padding:8px;z-index:99}
header.site{background:rgba(11,16,32,.85);backdrop-filter:blur(6px);position:sticky;top:0;z-index:50;border-bottom:2px solid rgba(34,211,238,.35)}
header.site .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:64px}
.logo{white-space:nowrap;display:flex;align-items:center;gap:8px;font-weight:900;font-size:1.3rem;color:var(--y);text-decoration:none}
.bolt{display:inline-block;animation:z 1.6s infinite}@keyframes z{0%,100%{transform:scale(1);filter:drop-shadow(0 0 6px var(--y))}50%{transform:scale(1.15);filter:drop-shadow(0 0 20px var(--y))}}
@media (prefers-reduced-motion:reduce){.bolt{animation:none}}
nav.main ul{list-style:none;display:flex;flex-wrap:wrap;gap:4px;margin:0;padding:0}
nav.main a{display:block;padding:6px 7px;white-space:nowrap;border-radius:999px;color:var(--txt);text-decoration:none;font-weight:600;font-size:.86rem}
nav.main ul{flex-wrap:nowrap;gap:2px}header.site .wrap{max-width:1280px}
nav.main a:hover,nav.main a[aria-current=page]{background:var(--c);color:#0b1020}
.menu-btn{display:none;background:var(--y);color:#0b1020;border:0;border-radius:10px;font-weight:800;padding:8px 14px;font-size:1rem}
@media (max-width:1200px){.menu-btn{display:block}nav.main{display:none;position:absolute;top:64px;left:0;right:0;background:#0b1020;padding:12px 20px;border-bottom:2px solid var(--c)}nav.main.open{display:block}nav.main ul{flex-direction:column}nav.main a{font-size:1.1rem;padding:10px}}
main{padding:24px 0 48px}
.hero{text-align:center;padding:40px 0 20px}.hero .big{font-size:5rem}.hero p{font-size:1.25rem;max-width:40rem;margin:.5em auto;color:var(--mut)}
.pill{display:inline-block;padding:.6em 1.4em;border:2px solid var(--c);border-radius:999px;color:var(--c);font-weight:800;text-decoration:none;margin:6px}
.btn{display:inline-block;background:var(--y);color:#0b1020;font-weight:800;border:0;border-radius:999px;padding:.6em 1.3em;text-decoration:none;cursor:pointer;font-size:1rem}
.btn:hover{background:var(--c);color:#0b1020}.btn.alt{background:var(--c)}
.card{background:var(--card);border:2px solid rgba(34,211,238,.25);border-radius:var(--r);padding:20px;box-shadow:0 8px 24px rgba(0,0,0,.25)}
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fill,minmax(250px,1fr))}
.tiles{grid-template-columns:repeat(auto-fill,minmax(150px,1fr))}.tiles a{display:flex;flex-direction:column;align-items:center;text-align:center;gap:6px;text-decoration:none;color:var(--txt);font-weight:800;font-size:1.15rem;padding:22px;background:linear-gradient(160deg,#1d2f6b,#14204a);border:2px solid rgba(250,204,21,.35);border-radius:20px;transition:transform .15s}
.tiles a:hover{transform:translateY(-4px) rotate(-1deg);border-color:var(--y);color:var(--y)}.tiles .e{font-size:2.6rem}.tiles small{font-weight:400;color:var(--mut);font-size:.9rem}
.feature{display:grid;grid-template-columns:1fr 1.3fr;gap:24px;align-items:center}@media(max-width:700px){.feature{grid-template-columns:1fr}}
.spark{background:linear-gradient(90deg,rgba(250,204,21,.15),rgba(34,211,238,.15));border:2px dashed var(--y);border-radius:var(--r);padding:20px;text-align:center;font-size:1.2rem}
.badge{display:inline-block;font-size:.8rem;font-weight:800;padding:2px 10px;border-radius:999px;background:#334155}
.badge.Beginner{background:#16a34a}.badge.Tinkerer{background:#d97706}.badge.Inventor{background:#9333ea}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 20px}.filters button{border:2px solid var(--c);background:transparent;color:var(--c);border-radius:999px;padding:6px 16px;font-weight:700;font-size:1rem;cursor:pointer}.filters button.on{background:var(--c);color:#0b1020}
.safety{background:#3b1d0a;border:3px solid #fb923c;border-radius:var(--r);padding:16px 20px;margin:20px 0}.safety strong:first-child{color:#fdba74}
.science{background:#062a33;border:3px solid var(--c);border-radius:var(--r);padding:16px 20px;margin:20px 0}
.story{background:rgba(250,204,21,.1);border:2px dashed var(--y);border-radius:12px;padding:10px 14px;color:#fde68a;font-style:italic;margin:12px 0}
.note{font-size:.85rem;color:#fde68a}
ol.steps{counter-reset:s;list-style:none;padding:0}ol.steps li{counter-increment:s;position:relative;padding:10px 10px 10px 56px;margin:10px 0;background:var(--card);border-radius:12px}
ol.steps li::before{content:counter(s);position:absolute;left:10px;top:8px;width:34px;height:34px;border-radius:50%;background:var(--y);color:#0b1020;font-weight:900;display:flex;align-items:center;justify-content:center}
.meta{display:flex;flex-wrap:wrap;gap:10px;margin:8px 0}.meta span{background:#0b1020;border:1px solid var(--c);border-radius:999px;padding:2px 12px;font-size:.9rem}
.illus{display:flex;justify-content:center;background:#0b1020;border-radius:var(--r);padding:16px}
footer.site{border-top:2px solid rgba(34,211,238,.35);background:rgba(11,16,32,.9);padding:28px 0;color:var(--mut);font-size:.95rem}
footer.site .cols{display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between}footer.site a{color:var(--mut)}footer.site ul{list-style:none;padding:0;margin:0;columns:2}
label{font-weight:700}input,select,textarea{font-size:1rem;padding:8px;border-radius:10px;border:2px solid var(--c);background:#0b1020;color:var(--txt);max-width:100%}
.tool{margin:28px 0}.out{font-size:1.4rem;font-weight:800;color:var(--y);min-height:1.5em}
.swatch{display:inline-block;width:22px;height:22px;border-radius:6px;vertical-align:middle;border:1px solid #fff}
.resbody{display:flex;justify-content:center;margin:12px 0}
table{border-collapse:collapse;width:100%}td,th{border:1px solid #334155;padding:8px;text-align:left}
.badges label{display:flex;gap:10px;align-items:center;padding:10px;background:var(--card);border-radius:12px;margin:6px 0;font-weight:600}.badges input{width:24px;height:24px}
.coming{text-align:center;font-size:1.4rem}