:root{color-scheme:light;--bg:#f7f7f2;--surface:#fff;--ink:#12233f;--muted:#56647a;--line:#dfe4e7;--accent:#176b87;--accent-2:#f3a712;--soft:#e8f4f5;--shadow:0 20px 60px rgba(31,55,77,.1)}
:root[data-theme="dark"]{color-scheme:dark;--bg:#0d1728;--surface:#14233a;--ink:#f5f7fa;--muted:#b9c5d4;--line:#2d405b;--accent:#62c8d5;--accent-2:#ffc85a;--soft:#192f43;--shadow:0 20px 60px rgba(0,0,0,.28)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:6rem}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;transition:background .2s,color .2s}a{color:inherit}img{display:block;max-width:100%;height:auto}.skip-link{position:fixed;z-index:20;top:.5rem;left:.5rem;padding:.7rem 1rem;background:var(--ink);color:var(--bg);transform:translateY(-150%)}.skip-link:focus{transform:none}.site-header{position:sticky;z-index:10;top:0;display:flex;align-items:center;gap:2rem;max-width:1240px;margin:auto;padding:1rem 2rem;background:color-mix(in srgb,var(--bg) 90%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:.65rem;margin-right:auto;font-weight:850;text-decoration:none}.brand span{display:grid;width:2.25rem;aspect-ratio:1;place-items:center;border-radius:.7rem;background:var(--ink);color:var(--bg)}nav{display:flex;gap:1.3rem}nav a{text-decoration:none;font-weight:650;color:var(--muted)}nav a:hover{color:var(--ink)}button,.button{font:inherit}.theme-toggle{display:flex;gap:.55rem;align-items:center;border:1px solid var(--line);border-radius:999px;padding:.6rem .9rem;background:var(--surface);color:var(--ink);cursor:pointer}.hero,.section,.safety-callout,footer{max-width:1180px;margin-inline:auto}.hero{display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:clamp(2rem,6vw,6rem);min-height:calc(100vh - 5rem);padding:5rem 2rem}.eyebrow{margin:0 0 .75rem;color:var(--accent);font-size:.78rem;font-weight:850;letter-spacing:.14em;text-transform:uppercase}.hero h1{max-width:780px;margin:.1rem 0 1.4rem;font-size:clamp(3rem,7vw,6.8rem);line-height:.92;letter-spacing:-.065em}.lead{max-width:650px;color:var(--muted);font-size:clamp(1.08rem,2vw,1.35rem)}.actions{display:flex;flex-wrap:wrap;gap:.8rem;margin:2rem 0}.button{display:inline-flex;justify-content:center;border:1px solid var(--ink);border-radius:999px;padding:.8rem 1.2rem;font-weight:780;text-decoration:none;cursor:pointer}.primary{background:var(--ink);color:var(--bg)}.secondary{background:transparent}.risk{max-width:650px;padding:1rem 1.2rem;border-left:4px solid var(--accent-2);background:var(--surface);color:var(--muted)}.hero-visual{position:relative;margin:0}.hero-visual:before{position:absolute;z-index:-1;inset:8%;border-radius:50%;background:var(--soft);content:""}.hero-visual img{border-radius:2rem;filter:drop-shadow(var(--shadow))}.section{padding:7rem 2rem}.section>h2,.quiz-section>div h2{max-width:760px;margin:.2rem 0 2.5rem;font-size:clamp(2.2rem,5vw,4.2rem);line-height:1.03;letter-spacing:-.045em}.lesson-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}.lesson{position:relative;padding:2rem;border:1px solid var(--line);border-radius:1.4rem;background:var(--surface);box-shadow:var(--shadow)}.lesson h3{margin:.9rem 0;font-size:1.45rem;line-height:1.2}.number{color:var(--accent);font-weight:900}.summary{padding-top:1rem;border-top:1px solid var(--line);color:var(--muted);font-weight:650}.safety-callout{display:flex;align-items:center;gap:1.5rem;margin-block:2rem;padding:2rem;border-radius:1.5rem;background:var(--ink);color:var(--bg)}.safety-callout>span{display:grid;flex:0 0 auto;width:3.5rem;aspect-ratio:1;place-items:center;border-radius:50%;background:var(--accent-2);color:#12233f;font-size:2rem;font-weight:900}.safety-callout h2,.safety-callout p{margin:.2rem 0}.quiz-section{display:grid;grid-template-columns:.72fr 1.28fr;gap:clamp(2rem,7vw,7rem)}.quiz fieldset{margin:0 0 1rem;padding:1.4rem;border:1px solid var(--line);border-radius:1rem;background:var(--surface)}.quiz legend{padding:0 .4rem;font-weight:800}.quiz label{display:block;margin:.45rem 0;padding:.35rem;border-radius:.35rem;cursor:pointer}.quiz label:has(input:focus-visible){outline:3px solid var(--accent)}.feedback{display:none;margin:.8rem 0 0;color:var(--muted)}.quiz fieldset.checked .feedback{display:block}.quiz fieldset.correct{border-color:#2f9e65}.quiz fieldset.incorrect{border-color:#d95d4e}.quiz-result{margin-top:1rem;font-size:1.15rem;font-weight:800}footer{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:2rem;margin-top:3rem;padding:2.5rem;border-top:1px solid var(--line);color:var(--muted)}.draft-badge{border:1px solid var(--line);border-radius:999px;padding:.45rem .75rem;font-size:.8rem}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
@media(max-width:850px){.site-header{gap:.75rem;padding:1rem}.site-header nav{display:none}.theme-label{display:none}.hero{grid-template-columns:1fr;min-height:auto;padding-top:4rem}.hero h1{font-size:clamp(3.2rem,15vw,5.4rem)}.hero-visual{max-width:650px}.lesson-grid,.quiz-section{grid-template-columns:1fr}.section{padding-block:5rem}.safety-callout{margin-inline:1rem}footer{grid-template-columns:1fr;gap:.5rem;margin-inline:1rem;padding-inline:1rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important}}