.cert21{--c21-radius:18px}.cert21 .c21-hero{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,.85fr);gap:clamp(28px,5vw,72px);padding:52px 0 48px;align-items:start}.cert21 h1{font-size:clamp(32px,3.5vw,50px);line-height:1.12;letter-spacing:-.035em;max-width:750px}.cert21 .c21-lead{font-size:17px;line-height:1.85;margin:24px 0 0;max-width:65ch}.cert21 .c21-passport{background:linear-gradient(145deg,var(--panel2),var(--panel));border:1px solid var(--line);border-radius:var(--c21-radius);padding:28px}.cert21 .c21-code{display:inline-block;color:var(--teal);font-size:19px;margin:8px 0 18px}.cert21 .c21-passport h2{font-size:21px;line-height:1.4}.cert21 .c21-passport p:not(.eyebrow){font-size:13px;line-height:1.8;margin:18px 0}.cert21 .c21-passport small{display:block;color:var(--muted);font-size:11px;margin-top:18px}.cert21 .cert-section{padding-block:48px}.cert21 .cert-section+.cert-section{border-top:1px solid var(--line)}.cert21 .c21-heading{margin-bottom:26px;max-width:820px}.cert21 .c21-heading h2,.cert21 .c21-fit h2{font-size:clamp(27px,2.5vw,35px);line-height:1.25}.cert21 .c21-heading>p:not(.eyebrow){margin-top:16px;font-size:15px;line-height:1.8}.cert21 .c21-skills{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.cert21 .c21-skills article{background:var(--panel);border:1px solid var(--line);border-radius:var(--c21-radius);padding:25px}.cert21 .c21-number{display:block;color:var(--teal);font-size:12px;margin-bottom:18px}.cert21 .c21-skills h3,.cert21 .c21-steps h3,.cert21 .c21-notebook h3{font-size:19px;line-height:1.4}.cert21 .c21-skills p,.cert21 .c21-steps p,.cert21 .c21-notebook p{font-size:14px;line-height:1.85;margin-top:12px}.cert21 .c21-practice{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:40px;align-items:start}.cert21 .c21-steps{list-style:none;margin:0;padding:0;display:grid;gap:0}.cert21 .c21-steps li{display:flex;gap:18px;padding:22px 0;border-bottom:1px solid var(--line)}.cert21 .c21-steps li:first-child{padding-top:0}.cert21 .c21-steps li:last-child{border-bottom:0}.cert21 .c21-steps li>span{width:36px;height:36px;display:grid;place-items:center;flex-shrink:0;border-radius:10px;background:var(--glow);color:var(--teal);font-size:12px;font-weight:700}.cert21 .c21-notebook{background:var(--panel);border:1px solid var(--line);border-radius:var(--c21-radius);padding:26px}.cert21 .c21-notebook>div+div{border-top:1px solid var(--line);margin-top:23px;padding-top:23px}.cert21 .c21-selfcheck{padding:22px 26px;background:var(--glow);border-left:3px solid var(--teal);border-radius:0 12px 12px 0;margin-top:24px}.cert21 .c21-selfcheck p{font-size:14px;line-height:1.8;margin-top:8px}.cert21 .c21-fit{display:grid;grid-template-columns:1fr 1fr;gap:40px}.cert21 .c21-fit h3{font-size:23px}.cert21 .c21-fit p:not(.eyebrow){font-size:15px;line-height:1.85;margin:18px 0}.cert21 .c21-fit .c21-separate{border-top:1px solid var(--line);padding-top:18px;font-size:13px}.cert21 .c21-related{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:16px}.cert21 .c21-related>a{padding:24px;border:1px solid var(--line);border-radius:14px;background:var(--panel);display:flex;justify-content:space-between;align-items:center;gap:16px;font-size:16px;font-weight:600;min-width:0}.cert21 .c21-related>a:first-child{background:var(--glow);border-color:var(--teal)}.cert21 .c21-sources{margin-top:28px;display:flex;flex-wrap:wrap;gap:16px 24px;border-top:1px solid var(--line);padding-top:22px;font-size:12px;line-height:1.7}.cert21 .c21-sources strong{width:100%}.cert21 a{overflow-wrap:anywhere}.cert21 .button{font-size:13px}.cert21 .cert-nav>div{justify-content:flex-start;gap:14px 30px}.cert21 .faq-intro h2{font-size:32px}.cert21 .c21-related>a:hover{border-color:var(--teal)}.cert21 :focus-visible{outline:2px solid var(--teal);outline-offset:4px}.cert21 .c21-skills article{animation:c21-appear .35s ease-out both}.cert21 .c21-skills article:nth-child(2){animation-delay:.07s}.cert21 .c21-skills article:nth-child(3){animation-delay:.14s}@keyframes c21-appear{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:850px){.cert21 .c21-hero{grid-template-columns:1fr;gap:26px;padding-block:32px}.cert21 .c21-hero h1{max-width:680px}.cert21 .c21-passport{padding:24px}.cert21 .c21-skills{gap:12px}.cert21 .c21-skills article{padding:20px}.cert21 .c21-practice{gap:24px}.cert21 .c21-fit{gap:26px}}
@media(max-width:640px){.cert21 .cert-section{padding-block:34px}.cert21 .c21-skills,.cert21 .c21-practice,.cert21 .c21-fit,.cert21 .c21-related{grid-template-columns:1fr}.cert21 .c21-lead{font-size:16px}.cert21 .c21-passport h2{font-size:20px}.cert21 .cert-actions{display:grid;grid-template-columns:1fr}.cert21 .cert-actions .button{width:100%}.cert21 .cert-nav>div{display:grid;grid-template-columns:1fr 1fr;gap:5px 18px}.cert21 .c21-notebook{padding:22px}.cert21 .c21-related>a{padding:21px}.cert21 .c21-selfcheck{padding:20px}.cert21 .c21-steps li{gap:14px}.cert21 .faq-topics{display:grid;grid-template-columns:1fr}.cert21 .faq-topics>button{width:100%;min-width:0}.cert21 .c21-fit h2{font-size:29px}}
@media(prefers-reduced-motion:reduce){.cert21 .c21-skills article{animation:none}}