/* Fully responsive, mobile-first stylesheet */
:root{--ink:#17221e;--muted:#5e6b65;--paper:#f7f8f4;--surface:#fff;--line:#dce4dc;--green:#176b50;--green-dark:#0e4b39;--lime:#d7f36a;--shadow:0 16px 44px rgba(20,43,32,.08);--radius:20px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:5.5rem}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.7 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;overflow-wrap:break-word}img,svg,video,iframe{max-width:100%;height:auto}a{color:var(--green-dark);text-underline-offset:4px}a:hover{color:#0a382b}button,input{font:inherit}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid #b4ce27;outline-offset:3px}.container{width:min(1120px,calc(100% - 40px));margin-inline:auto}.skip-link{position:absolute;left:12px;top:-70px;background:#fff;padding:10px 14px;z-index:30}.skip-link:focus{top:12px}
.site-header{position:sticky;top:0;z-index:20;background:rgba(247,248,244,.96);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}.header-inner,.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:74px}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:800;letter-spacing:-.03em;color:var(--ink);min-width:0}.brand em{font-style:normal;color:var(--green)}.brand-mark{display:grid;place-items:center;flex:0 0 36px;width:36px;height:36px;border-radius:12px;background:var(--green);color:#fff;font-weight:900}.primary-nav{display:flex;align-items:center;gap:25px}.primary-nav a{text-decoration:none;color:var(--muted);font-size:.94rem}.primary-nav a[aria-current=page],.primary-nav a:hover{color:var(--green-dark)}.menu-toggle{display:none;border:1px solid var(--line);background:#fff;width:44px;height:42px;border-radius:12px;padding:10px;cursor:pointer}.menu-toggle span{display:block;height:2px;background:var(--green-dark);margin:4px 0;border-radius:2px}
.eyebrow{font-size:.76rem;letter-spacing:.14em;font-weight:800;color:var(--green);margin:0 0 14px}.hero{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(280px,.9fr);align-items:center;gap:clamp(24px,5vw,55px);padding-block:clamp(44px,7vw,82px)}.hero h1{font-size:clamp(2.5rem,6vw,5rem);line-height:1.02;letter-spacing:-.065em;margin:0 0 24px}.hero h1 span{color:var(--green)}.lead{font-size:clamp(1.05rem,2vw,1.2rem);line-height:1.6;color:#46564e;max-width:720px}.hero-copy>.lead{max-width:620px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:30px 0}.button{display:inline-flex;justify-content:center;align-items:center;gap:10px;padding:12px 18px;background:var(--green);color:#fff;border:1px solid var(--green);border-radius:999px;text-decoration:none;font-weight:750;cursor:pointer;transition:transform .15s ease,background .15s ease;max-width:100%}.button:hover{background:var(--green-dark);color:#fff;transform:translateY(-1px)}.button.secondary{background:transparent;color:var(--green-dark);border-color:#b9c9be}.button.secondary:hover{background:#edf2eb}.trust-row{display:flex;flex-wrap:wrap;gap:10px 18px;color:var(--muted);font-size:.88rem}.hero-visual{min-width:0;height:clamp(230px,31vw,340px);position:relative;display:grid;place-items:center;overflow:hidden;border-radius:clamp(24px,4vw,40px);background:linear-gradient(135deg,#e3eee6,#e7edf2);border:1px solid #d7e3d9}.orbit{position:absolute;border:1px solid rgba(23,107,80,.24);border-radius:50%;transform:rotate(-25deg);max-width:90%}.orbit-one{width:330px;height:190px}.orbit-two{width:250px;height:300px;transform:rotate(42deg)}.core{width:clamp(105px,12vw,132px);height:clamp(105px,12vw,132px);border-radius:35px;display:grid;place-content:center;text-align:center;background:var(--green);color:#fff;font-size:1.4rem;line-height:1.3;font-weight:850;box-shadow:0 18px 50px #176b503d;transform:rotate(-6deg)}.node{position:absolute;padding:7px 12px;background:#fff;border:1px solid #d7e3d9;border-radius:12px;font-weight:800;color:var(--green-dark);box-shadow:var(--shadow);font-size:.86rem;max-width:45%}.node-a{top:14%;left:8%}.node-b{right:6%;top:31%}.node-c{left:15%;bottom:12%}
.section{padding-block:48px 76px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:28px}.section-heading h2,.feature-inner h2,.how-section h2{font-size:clamp(1.8rem,4vw,2.7rem);letter-spacing:-.045em;line-height:1.15;margin:0}.section-heading>p{max-width:360px;color:var(--muted);margin:0}.lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.lesson-card{display:flex;flex-direction:column;min-width:0;min-height:300px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(18px,2.5vw,24px);box-shadow:0 8px 24px #102f1b06}.card-number{font-size:2rem;font-weight:850;letter-spacing:-.06em;color:var(--green)}.card-tag{font-size:.72rem;letter-spacing:.12em;color:var(--muted);font-weight:800;margin:15px 0 3px}.lesson-card h3{font-size:1.3rem;line-height:1.25;letter-spacing:-.03em;margin:8px 0}.lesson-card>p:not(.card-tag){color:var(--muted);margin:4px 0 25px}.card-bottom{display:flex;justify-content:space-between;align-items:end;gap:10px;flex-wrap:wrap;margin-top:auto;padding-top:18px;border-top:1px solid var(--line);font-size:.83rem}.card-bottom span{color:var(--muted)}.card-bottom a{font-weight:750;text-decoration:none;white-space:normal}.feature-band{background:#e7efe8;border-block:1px solid #d7e3d9}.feature-inner{display:grid;grid-template-columns:1fr 1fr;gap:clamp(22px,6vw,60px);align-items:center;padding-block:46px}.feature-inner>p{color:#4f6257;font-size:1.06rem}.how-section{display:grid;grid-template-columns:.7fr 1.3fr;gap:clamp(24px,5vw,55px)}.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.steps article span{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--lime);font-weight:850}.steps h3{margin:12px 0 3px}.steps p{margin:0;color:var(--muted);font-size:.93rem}.site-footer{border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}.footer-inner{min-height:72px}.footer-inner p{margin:0}.footer-inner a{color:var(--muted)}
.lesson-layout{padding-block:24px 70px}.breadcrumbs{display:flex;gap:10px;align-items:center;flex-wrap:wrap;color:var(--muted);font-size:.9rem;margin-bottom:26px}.breadcrumbs a{color:var(--muted)}.lesson-hero{max-width:850px;padding:18px 0 30px}.lesson-hero h1,.policy-page h1{font-size:clamp(2.4rem,5vw,4.3rem);line-height:1.05;letter-spacing:-.06em;margin:0 0 15px}.lesson-hero .lead{margin:0 0 16px}.meta-row{display:flex;gap:18px;align-items:center;flex-wrap:wrap;margin-top:22px;color:var(--muted);font-size:.9rem}.meta-row .button{font-size:.9rem}.lesson-columns{display:grid;grid-template-columns:minmax(210px,250px) minmax(0,1fr);gap:clamp(20px,3vw,32px);align-items:start}.panel{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:22px;min-width:0}.toc{position:sticky;top:96px}.toc h2,.objectives h2{font-size:1.1rem;margin:0 0 12px}.toc ol{padding-left:22px;margin:0}.toc li{padding:5px 0;color:var(--muted);font-size:.9rem}.toc a{text-decoration:none}.objectives{margin-bottom:26px;background:#eef4ee}.objectives ul{margin:0;padding-left:22px}.content-section{padding:8px 0 20px;scroll-margin-top:95px}.content-section h2{font-size:clamp(1.3rem,2.5vw,1.55rem);line-height:1.25;letter-spacing:-.035em;margin:0 0 12px}.content-section p{margin:10px 0 14px}.code-example{white-space:pre-wrap;overflow-wrap:anywhere;overflow-x:auto;max-width:100%;background:#16251f;color:#e5f2e8;padding:clamp(13px,3vw,20px);border-radius:14px;font:.9rem/1.65 ui-monospace,SFMono-Regular,Consolas,monospace}.exercise{border:1px solid var(--line);border-radius:14px;padding:18px;margin:14px 0;background:#fff;min-width:0}.exercise h3{font-size:.8rem;letter-spacing:.12em;color:var(--green);margin:0}.exercise p{margin:8px 0 12px}.text-button{background:none;border:0;padding:0;color:var(--green-dark);font-weight:750;text-decoration:underline;text-underline-offset:4px;cursor:pointer}.answer{background:#eef4ee;padding:10px 14px;border-radius:10px;margin-top:12px}.answer p{margin:0}.quiz{margin-top:15px}.quiz form{display:grid;gap:10px}.quiz-option{display:flex;gap:10px;align-items:flex-start;min-width:0}.quiz-option input{accent-color:var(--green);width:17px;height:17px;flex:0 0 17px;margin-top:5px}.quiz form .button{justify-self:start;margin-top:5px}.quiz-feedback,.topic-feedback{font-weight:700;color:var(--green-dark);min-height:1.5em}.topic-options{display:flex;flex-wrap:wrap;gap:10px}.topic-option{border:1px solid #b9c9be;background:#fff;color:var(--green-dark);border-radius:999px;padding:10px 14px;cursor:pointer;max-width:100%}.topic-option:hover,.topic-option[aria-pressed=true]{background:#e6f1e8;border-color:var(--green)}.lesson-pagination{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:34px 0 10px}.policy-page{max-width:850px;padding-block:30px 80px}.policy-page section{padding:14px 0;border-bottom:1px solid var(--line)}.policy-page h2{font-size:1.3rem;margin-bottom:5px}.policy-page p{color:#46564e}.policy-page>.button{margin-top:25px}
@media(max-width:900px){.hero{grid-template-columns:minmax(0,1fr) minmax(250px,.8fr)}.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-card:last-child{grid-column:1/-1;min-height:240px}.lesson-columns{grid-template-columns:1fr}.toc{position:static}.toc ol{columns:2;column-gap:24px}.toc li{break-inside:avoid}.how-section{grid-template-columns:1fr;gap:22px}}
@media(max-width:680px){.container{width:min(100% - 32px,1120px)}.header-inner{min-height:66px;gap:12px}.brand{font-size:.92rem}.brand-mark{flex-basis:32px;width:32px;height:32px}.menu-toggle{display:block;flex:0 0 44px}.primary-nav{display:none;position:absolute;top:calc(100% + 1px);left:0;right:0;background:var(--paper);padding:12px 16px 18px;border-bottom:1px solid var(--line);box-shadow:0 12px 20px #17221e0c;flex-direction:column;align-items:stretch;gap:0}.primary-nav.is-open{display:flex}.primary-nav a{padding:12px 8px;border-radius:8px}.primary-nav a:hover{background:#edf2eb}.hero{grid-template-columns:1fr;padding-block:42px 52px;gap:28px}.hero h1{font-size:clamp(2.5rem,11vw,3.5rem)}.hero-visual{height:245px}.section{padding-block:36px 52px}.section-heading{display:block}.section-heading>p{margin-top:12px}.lesson-grid{grid-template-columns:1fr}.lesson-card,.lesson-card:last-child{grid-column:auto;min-height:unset}.card-bottom{margin-top:10px}.feature-inner{grid-template-columns:1fr;gap:12px;padding-block:34px}.steps{grid-template-columns:1fr;gap:20px}.steps article{display:grid;grid-template-columns:36px 1fr;column-gap:12px;align-items:start}.steps article span{grid-row:span 2}.steps h3{margin:0}.steps p{grid-column:2}.lesson-layout{padding-block:18px 48px}.breadcrumbs{margin-bottom:18px}.lesson-hero{padding-top:10px}.lesson-hero h1,.policy-page h1{font-size:clamp(2.2rem,10vw,3.3rem)}.meta-row{align-items:flex-start;flex-direction:column;gap:12px}.panel{padding:18px}.toc ol{columns:1}.content-section{scroll-margin-top:78px}.lesson-pagination .button{flex:1 1 auto}.footer-inner{align-items:flex-start;flex-direction:column;gap:4px;padding-block:16px}}
@media(max-width:380px){.container{width:calc(100% - 24px)}.hero-actions{align-items:stretch;flex-direction:column}.hero-actions .button{width:100%}.trust-row{display:grid;gap:6px}.hero-visual{height:210px}.node{font-size:.75rem;padding:6px 9px}.card-bottom{align-items:flex-start;flex-direction:column}.panel{padding:15px}.exercise{padding:14px}.button{white-space:normal;text-align:center}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}