@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#15211d;--muted:#68756f;--paper:#f5f7f1;--white:#fff;--line:#d9e0d7;--mint:#dceee5;--green:#208063;--lime:#b9e274;--orange:#f2a35d}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Manrope,Arial,sans-serif;font-size:15px;line-height:1.6}a{color:inherit;text-decoration:none}.shell{max-width:1180px;margin:0 auto;padding-left:30px;padding-right:30px}.site-header{height:82px;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 max(30px,calc((100vw - 1180px)/2 + 30px));gap:46px;background:rgba(245,247,241,.94)}.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:-.06em}.brand-mark{width:31px;height:31px;border-radius:50%;background:var(--ink);color:var(--lime);display:grid;place-items:center;font:500 11px 'DM Mono',monospace;letter-spacing:-.08em}.brand-dot{color:var(--green)}.nav-links{display:flex;align-items:center;gap:29px;color:#78837d;font-size:13px;font-weight:600}.nav-links a{padding:29px 0;border-bottom:2px solid transparent}.nav-links a.active,.nav-links a:hover{color:var(--ink);border-color:var(--green)}.header-link{margin-left:auto;font-size:12px;font-weight:700}.header-link span,.text-link span,.card-link span{color:var(--green);margin-left:7px}.hero{display:grid;grid-template-columns:1fr 410px;gap:100px;align-items:center;padding-top:88px;padding-bottom:83px}.eyebrow{margin:0 0 16px;color:var(--green);font:500 11px 'DM Mono',monospace;letter-spacing:.1em;text-transform:uppercase}.pulse{display:inline-block;background:var(--orange);width:7px;height:7px;border-radius:50%;margin:0 8px 1px 0}.hero h1{font-size:clamp(68px,10vw,128px);line-height:.9;letter-spacing:-.095em;margin:0 0 27px;font-weight:800}.period{color:var(--green)}.lede{max-width:550px;color:#52615a;font-size:17px;line-height:1.75;margin:0}.hero-actions{display:flex;align-items:center;gap:27px;margin-top:38px}.button{display:inline-flex;align-items:center;gap:22px;padding:14px 20px;font-size:12px;font-weight:700}.button-dark{background:var(--ink);color:white}.button-dark span{color:var(--lime);font-size:18px;line-height:0}.text-link{font-weight:700;font-size:12px}.element-card{height:410px;aspect-ratio:1/1;position:relative;overflow:hidden;border-radius:22px;background:linear-gradient(145deg,#163b31,#0c251f);color:white;padding:28px;box-shadow:0 20px 50px rgba(27,56,44,.18)}.card-top,.card-bottom{display:flex;justify-content:space-between;position:relative;z-index:2;color:#a7c8b6;text-transform:uppercase;font:10px 'DM Mono',monospace;letter-spacing:.08em}.atomic-number{position:relative;z-index:2;font:500 22px 'DM Mono',monospace;margin-top:41px;color:var(--lime)}.symbol{position:relative;z-index:2;font-size:150px;line-height:.9;letter-spacing:-.12em;font-weight:800;margin-left:-11px;margin-top:2px}.element-name{position:relative;z-index:2;font-size:18px;letter-spacing:.1em;text-transform:lowercase}.card-bottom{position:absolute;bottom:26px;left:28px;right:28px}.orbit{position:absolute;border:1px solid rgba(185,226,116,.3);border-radius:50%;width:470px;height:175px;left:-30px;top:105px;transform:rotate(-30deg)}.orbit-two{width:500px;height:245px;top:85px;left:-47px;transform:rotate(34deg);border-color:rgba(161,224,193,.2)}.nucleus{position:absolute;width:88px;height:88px;right:45px;bottom:62px;background:radial-gradient(circle at 35% 35%,#d7f69c,#80b76c 48%,#2b715b 50%);border-radius:50%;box-shadow:0 0 0 15px rgba(185,226,116,.06),0 0 50px rgba(185,226,116,.3)}.quick-facts{border-top:1px solid var(--line);border-bottom:1px solid var(--line);display:grid;grid-template-columns:repeat(4,1fr);padding-top:24px;padding-bottom:24px}.quick-facts>div{padding:0 26px;border-right:1px solid var(--line)}.quick-facts>div:first-child{padding-left:0}.quick-facts>div:last-child{border:0}.fact-label,.result-label{display:block;color:var(--muted);font:10px 'DM Mono',monospace;text-transform:uppercase;letter-spacing:.08em;margin-bottom:7px}.quick-facts strong{font-size:14px}.content-grid{display:grid;grid-template-columns:1fr 330px;gap:80px;padding-top:105px;padding-bottom:103px}.section-heading{display:flex;justify-content:space-between;align-items:end;margin-bottom:38px}.section-heading h2,.decay-intro h2{margin:0;max-width:480px;line-height:1.08;letter-spacing:-.055em;font-size:35px}.section-rule{height:1px;background:var(--line);width:42%;margin-bottom:9px}.note-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.note-card{background:white;border:1px solid var(--line);padding:25px 22px 23px;min-height:274px;display:flex;flex-direction:column}.accent-card{background:var(--mint);border-color:transparent}.note-index{font:11px 'DM Mono',monospace;color:var(--green)}.note-card h3{font-size:17px;line-height:1.3;margin:32px 0 11px;letter-spacing:-.03em}.note-card p{color:var(--muted);font-size:12px;line-height:1.7;margin:0}.card-link{font-size:11px;font-weight:800;margin-top:auto;padding-top:20px}.aside-title{display:flex;justify-content:space-between;font:500 11px 'DM Mono',monospace;text-transform:uppercase;letter-spacing:.07em;border-bottom:1px solid var(--line);padding-bottom:14px}.live-dot{font-size:9px;color:var(--green)}.spec-list{margin:0}.spec-list div{display:flex;justify-content:space-between;border-bottom:1px solid var(--line);padding:13px 0}.spec-list dt{color:var(--muted);font-size:12px}.spec-list dd{font-size:12px;font-weight:700;margin:0}.safety-box{display:flex;gap:13px;background:#fff1e5;padding:16px;margin-top:27px}.safety-icon{background:var(--orange);color:white;width:22px;height:22px;display:grid;place-items:center;border-radius:50%;font-weight:800;font-size:12px;flex:none}.safety-box strong{font-size:12px}.safety-box p{font-size:11px;line-height:1.55;color:#806c5d;margin:5px 0 0}.decay-section{background:var(--ink);color:white;max-width:none;padding-top:72px;padding-bottom:72px;padding-left:max(30px,calc((100vw - 1180px)/2 + 30px));padding-right:max(30px,calc((100vw - 1180px)/2 + 30px));display:grid;grid-template-columns:1fr 1.1fr;gap:100px}.decay-intro p:not(.eyebrow){color:#aebdb5;max-width:390px;font-size:13px}.decay-intro h2{color:white}.decay-tool{background:#213a31;padding:27px 30px 25px;border:1px solid #365648}.tool-header{display:flex;justify-content:space-between;font:12px 'DM Mono',monospace;color:#d8e7da}.tool-header strong{color:var(--lime);font-weight:400}input[type=range]{width:100%;margin:32px 0 0;appearance:none;height:3px;background:linear-gradient(90deg,var(--lime) var(--progress),#557064 var(--progress));outline:none}input[type=range]::-webkit-slider-thumb{appearance:none;width:17px;height:17px;border-radius:50%;background:var(--lime);cursor:pointer;border:3px solid #213a31;box-shadow:0 0 0 1px var(--lime)}.range-labels{display:flex;justify-content:space-between;color:#8ea79a;font:10px 'DM Mono',monospace;margin-top:10px}.decay-result{border-top:1px solid #3a584a;margin-top:28px;padding-top:23px;display:flex;align-items:center;gap:22px}.result-ring{width:93px;height:93px;border-radius:50%;border:7px solid var(--lime);display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--lime);font-size:23px;font-weight:800;line-height:1}.result-ring small{font:9px 'DM Mono',monospace;color:#b3c7bc;margin-top:5px}.decay-result strong{display:block;font-size:20px}.decay-result p{color:#8ea79a;font:10px 'DM Mono',monospace;margin:4px 0 0}.timeline{padding-top:105px;padding-bottom:115px}.timeline-row{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:1px solid var(--line)}.timeline-item{padding:24px 34px 0 0;border-right:1px solid var(--line);margin-right:34px}.timeline-item:last-child{border:0}.timeline-item span{font:11px 'DM Mono',monospace;color:var(--green)}.timeline-item strong{display:block;margin-top:15px;font-size:16px}.timeline-item p{font-size:12px;color:var(--muted);max-width:235px}.site-footer{border-top:1px solid var(--line);padding:37px max(30px,calc((100vw - 1180px)/2 + 30px));display:flex;align-items:end;gap:60px;color:var(--muted);font-size:11px}.footer-brand{color:var(--ink);font-size:16px}.site-footer p{margin:13px 0 0}.footer-links{display:flex;gap:25px;margin-left:auto}.footer-links a:hover{color:var(--green)}.footer-note{font:10px 'DM Mono',monospace}
@media(max-width:850px){.site-header{gap:18px;padding:0 20px}.nav-links{display:none}.header-link{font-size:11px}.shell{padding-left:20px;padding-right:20px}.hero{grid-template-columns:1fr;gap:48px;padding-top:60px;padding-bottom:60px}.element-card{height:auto;width:min(100%,410px);justify-self:center}.quick-facts{grid-template-columns:repeat(2,1fr);gap:20px}.quick-facts>div{padding:0 12px;border:0}.quick-facts>div:first-child{padding-left:0}.content-grid,.decay-section{grid-template-columns:1fr;gap:55px}.content-grid{padding-top:70px;padding-bottom:70px}.note-grid{grid-template-columns:1fr}.note-card{min-height:220px}.decay-section{padding-top:55px;padding-bottom:55px}.timeline{padding-top:70px;padding-bottom:75px}.timeline-row{grid-template-columns:1fr}.timeline-item{border-right:0;border-bottom:1px solid var(--line);padding-bottom:19px;margin:0}.site-footer{flex-wrap:wrap;gap:25px}.footer-links{margin-left:0}.footer-note{width:100%}}
@media(max-width:430px){.hero h1{font-size:72px}.lede{font-size:15px}.hero-actions{align-items:flex-start;flex-direction:column;gap:20px}.element-card{height:330px}.symbol{font-size:115px}.quick-facts strong{font-size:12px}.section-heading h2,.decay-intro h2{font-size:29px}.section-rule{display:none}}