:root{color-scheme:light;--ink:#0b1120;--ink-2:#172236;--text:#243247;--muted:#5d6b7f;--green:#10b981;--green-dark:#087f5b;--pale:#eaf8f1;--line:#dce5e9;--paper:#fff;--canvas:#f7faf9;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-synthesis:none}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:86px}
body{margin:0;background:var(--canvas);color:var(--text);line-height:1.55}
body,input,button{font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
a{color:inherit;text-decoration:none}
button,input{font:inherit}
button{cursor:pointer}
img{max-width:100%;display:block}
:focus-visible{outline:3px solid #15c98d;outline-offset:3px}
.skip-link{position:absolute;top:-100px;left:16px;z-index:100;background:var(--green);padding:10px 15px;color:#05261b;font-weight:800;border-radius:8px}
.skip-link:focus{top:12px}
.shell{width:min(100% - 48px,1180px);margin-inline:auto}
.site-header{position:sticky;top:0;z-index:20;background:#0b1120f5;border-bottom:1px solid #253247;backdrop-filter:blur(14px)}
.header-inner{height:72px;display:flex;align-items:center;gap:28px}
.brand{display:inline-flex;align-items:center;gap:10px;white-space:nowrap;color:#fff;font-weight:850;font-size:20px;letter-spacing:-.045em}
.brand img{border-radius:10px;flex:none}
.brand-accent{color:#47e0ae}
.site-nav{display:flex;gap:8px;margin-left:auto}
.site-nav a{font-size:13px;font-weight:650;color:#c2cedb;padding:9px 12px;border-radius:8px;transition:background .2s,color .2s}
.site-nav a:hover,.site-nav a:focus-visible{background:#1d2c41;color:#fff}
.header-link{font-size:12px;font-weight:800;color:#071d16;background:var(--green);padding:10px 13px;border-radius:8px;white-space:nowrap;transition:background .2s}
.header-link:hover{background:#4ee1b2}
.hero{overflow:hidden;position:relative;color:#fff;background:radial-gradient(circle at 76% 20%,#164139 0%,transparent 33%),radial-gradient(circle at 8% 93%,#152b35 0%,transparent 35%),#0b1120}
.hero:before{content:"";position:absolute;inset:0;opacity:.24;background-image:linear-gradient(#45605d44 1px,transparent 1px),linear-gradient(90deg,#45605d44 1px,transparent 1px);background-size:42px 42px;mask-image:linear-gradient(90deg,transparent 5%,#000 85%);pointer-events:none}
.hero-grid{position:relative;display:grid;grid-template-columns:minmax(0,1.05fr) minmax(350px,.8fr);gap:clamp(35px,7vw,110px);align-items:center;padding-block:100px 112px}
.eyebrow{margin:0 0 16px;color:#05845f;font-size:11px;font-weight:850;text-transform:uppercase;letter-spacing:.16em}
.eyebrow.light{color:#65e6b9}
.status-dot{width:8px;height:8px;display:inline-block;margin-right:7px;background:#48e2ae;border-radius:50%;box-shadow:0 0 0 4px #48e2ae25}
h1,h2,h3,p{overflow-wrap:break-word}
h1,h2,h3{line-height:1.14;letter-spacing:-.045em}
.hero h1{font-size:clamp(43px,5vw,69px);max-width:790px;margin:0;font-weight:850}
.hero h1 em,.section-heading h2 em{font-style:normal;color:#69e1ba}
.hero-lead{max-width:650px;margin:27px 0 0;color:#cbd6dc;font-size:17px;line-height:1.75}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.button{display:inline-flex;align-items:center;justify-content:center;gap:18px;min-height:47px;padding:12px 18px;border-radius:9px;font-size:13px;font-weight:800;border:1px solid transparent;transition:transform .18s,background .18s,border-color .18s}
.button:hover{transform:translateY(-2px)}
.button-primary{background:var(--green);color:#06261a}
.button-primary:hover{background:#4ee0ae}
.button-ghost{color:#ecf5f4;background:#ffffff0d;border-color:#ffffff35}
.button-ghost:hover{background:#ffffff1a}
.hero-note{color:#92aab0;font-size:12px;margin:20px 0 0}
.hero-panel{position:relative;padding:22px 27px 20px;border:1px solid #5d9d8a66;border-radius:18px;background:linear-gradient(148deg,#182f39d9,#101c2bed);box-shadow:0 30px 80px #0008,inset 0 1px #ffffff18;transform:rotate(2deg)}
.hero-panel:after{content:"";position:absolute;inset:10px -10px -10px 10px;border:1px solid #4cd4a03d;border-radius:18px;z-index:-1}
.panel-top,.lab-card-head{display:flex;align-items:center;justify-content:space-between;gap:15px}
.panel-kicker,.panel-footer,.lesson-index,.feature-num,.offline-pill,.availability-label{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:10px;font-weight:800;letter-spacing:.1em}
.panel-kicker{color:#80c9b1}
.panel-mark{color:#56ddae;font-size:20px}
.nine-grid{display:grid;grid-template-columns:repeat(3,22px);gap:15px;width:max-content;margin:32px auto 38px}
.nine-grid span{width:22px;height:22px;border-radius:50%;background:#0e9878;box-shadow:0 0 20px #11c99425}
.nine-grid span:nth-child(even){background:#effef8}
.nine-grid span:nth-child(5){background:#0bea9e;box-shadow:0 0 22px #0bea9e66}
.panel-divider{height:1px;background:#ffffff25;margin-bottom:4px}
.panel-row{display:flex;align-items:center;gap:15px;border-bottom:1px solid #ffffff14;padding:11px 0}
.panel-row span:first-child{font:700 11px ui-monospace,monospace;color:#68dbae}
.panel-row p{margin:0;flex:1;font-weight:700;font-size:13px;color:#e9f6f2}
.panel-row span:last-child{color:#66d5ad}
.panel-footer{font-size:10px;line-height:1.6;letter-spacing:0;color:#839aa5;margin-top:16px;font-weight:550}
.availability-bar{background:#eaf3ef;border-bottom:1px solid #d5e7dd}
.availability-inner{min-height:48px;display:flex;align-items:center;flex-wrap:wrap;gap:11px 18px;color:#244538;font-size:12px;font-weight:650;padding-block:10px}
.availability-label{color:#07855e;font-size:10px}
.separator{height:4px;width:4px;border-radius:50%;background:#74a596}
.section{padding-block:100px}
.section-heading{margin-bottom:35px}
.split-heading{display:grid;grid-template-columns:1.2fr .8fr;align-items:end;gap:35px}
.section-heading h2,.lab-intro h2,.closing h2{font-size:clamp(31px,3.4vw,46px);margin:0;color:var(--ink);font-weight:850}
.section-heading h2 em{color:#08845e}
.section-heading>p{max-width:395px;margin:0 0 4px auto;color:var(--muted);font-size:15px;line-height:1.7}
.lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}
.lesson-card{display:flex;flex-direction:column;min-height:295px;padding:27px;background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:0 6px 26px #22382708;transition:transform .2s,box-shadow .2s}
.lesson-card:hover{transform:translateY(-3px);box-shadow:0 12px 30px #1d3c2b16}
.lesson-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.lesson-index{color:#07835d;text-transform:uppercase}
.lesson-icon{display:grid;place-items:center;width:35px;height:35px;border:1px solid #cfebdc;border-radius:9px;color:#06845d;background:#f2fbf5;font-size:18px;font-weight:700}
.lesson-card h3{font-size:22px;margin:21px 0 11px;color:var(--ink)}
.lesson-card>p{color:#536478;font-size:14px;line-height:1.7;margin:0}
.lesson-takeaway{margin-top:auto;padding-top:25px;display:grid;gap:5px;font-size:12px;color:#355647}
.lesson-takeaway strong{text-transform:uppercase;color:#07835d;font-size:10px;letter-spacing:.1em}
.lesson-card-wide{grid-column:span 3;min-height:auto;display:grid;grid-template-columns:1fr 1.7fr 1fr;align-items:center;gap:25px;background:#e9f7f0;border-color:#c9e8d7}
.lesson-card-wide .lesson-top{display:block}
.lesson-card-wide .lesson-icon{margin-top:15px}
.lesson-card-wide h3{margin:0}
.lesson-card-wide .lesson-takeaway{padding:0}
.lab-section{background:#0f1b2a;color:#e9f2f0;position:relative;overflow:hidden}
.lab-section:before{content:"";position:absolute;right:-170px;bottom:-330px;width:690px;height:690px;border-radius:50%;border:1px solid #2bc58d25;box-shadow:0 0 0 85px #1c8e6410,0 0 0 170px #1c8e6409;pointer-events:none}
.lab-grid{position:relative;display:grid;grid-template-columns:.8fr 1fr;gap:clamp(36px,8vw,120px);align-items:center}
.lab-intro .eyebrow{color:#65d9ae}
.lab-intro h2{color:#fff}
.lab-intro>p:not(.eyebrow){max-width:460px;color:#b9c9d1;line-height:1.75;font-size:15px;margin:22px 0}
.lab-points{list-style:none;padding:0;margin:32px 0 0;display:grid;gap:12px;color:#d2e5db;font-size:13px}
.lab-points li{display:flex;gap:10px}
.lab-points li:before{content:"✓";color:#5ce4ae;font-weight:850}
.lab-card{background:#fff;color:var(--text);border-radius:15px;padding:29px;box-shadow:0 30px 90px #0005}
.offline-pill{background:#e8f7ee;color:#07865e;border-radius:100px;padding:7px 10px;letter-spacing:0}
.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:17px;margin-top:24px}
.field-grid label{display:grid;gap:7px;font-size:12px;font-weight:750;color:#415165}
.field-grid input{width:100%;height:45px;border:1px solid #ccd8df;border-radius:8px;padding:10px 12px;color:var(--ink);background:#fff;font-size:14px;font-weight:650}
.field-grid input::placeholder{color:#9baab5;font-weight:400}
.field-grid input:focus{border-color:#10b981;outline:3px solid #10b98125}
.field-help{font-size:11px;color:#667487;margin:12px 0 20px}
.calculate-button{width:100%;border:0}
.lab-output{margin-top:23px;background:#f1f7f4;border:1px solid #d9e9df;border-radius:10px;padding:17px 18px;color:#405747;font-size:13px;min-height:70px}
.lab-output p{margin:0;line-height:1.6}
.lab-output strong{color:#0b5138}
.lab-output .result-number{font-size:27px;font-weight:850;letter-spacing:-.04em;color:#0b5138;display:block;line-height:1.2;margin:5px 0}
.lab-output.error{background:#fff5f2;border-color:#f1cfc6;color:#a13523}
.lab-disclaimer{margin:14px 0 0;color:#778596;font-size:11px;line-height:1.6}
.features-section{background:#fff}
.feature-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px}
.feature-card{display:flex;flex-direction:column;min-height:240px;padding:22px;border:1px solid var(--line);border-radius:12px;background:#fbfdfc}
.feature-num{display:grid;place-items:center;width:30px;height:30px;border-radius:7px;color:#067d59;background:#e8f5ed}
.feature-card h3{font-size:17px;color:var(--ink);margin:18px 0 9px}
.feature-card p{font-size:12px;color:#5e6c7d;line-height:1.7;margin:0 0 20px}
.feature-card a{margin-top:auto;color:#07845c;font-size:12px;font-weight:750}
.feature-card a:hover{text-decoration:underline}
.closing{background:var(--ink);color:#fff;padding-block:58px;border-top:1px solid #273e43}
.closing-grid{display:grid;grid-template-columns:1fr auto;align-items:center;gap:50px}
.closing h2{max-width:710px;color:#fff;font-size:clamp(29px,3vw,39px)}
.closing p:not(.eyebrow){max-width:700px;color:#b8c7cf;font-size:14px;line-height:1.7;margin:16px 0 0}
.site-footer{background:#080f1c;border-top:1px solid #273242;color:#8ea0b2}
.footer-inner{min-height:95px;display:flex;align-items:center;gap:25px}
.footer-inner .brand{font-size:16px}
.footer-inner p{font-size:11px;margin:0 auto 0 0}
.footer-inner>a:last-child{font-size:11px;font-weight:700;color:#adcfbe;white-space:nowrap}
@media(max-width:1050px){.hero-grid{grid-template-columns:1fr .75fr;gap:35px}.hero h1{font-size:clamp(42px,5vw,60px)}.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-card-wide{grid-column:span 2}.feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:760px){.shell{width:min(100% - 36px,1180px)}.site-nav{display:none}.header-inner{height:66px}.header-link{margin-left:auto}.hero-grid{grid-template-columns:1fr;padding-block:68px 78px}.hero-panel{max-width:460px;width:100%;justify-self:center;transform:none}.hero h1{font-size:clamp(39px,9vw,58px)}.hero-lead{font-size:15px}.section{padding-block:72px}.split-heading{grid-template-columns:1fr;gap:14px}.section-heading>p{margin:0;max-width:600px}.lab-grid{grid-template-columns:1fr;gap:35px}.lab-intro>p:not(.eyebrow){max-width:650px}.closing-grid{grid-template-columns:1fr;gap:25px}.closing .button{justify-self:start}.footer-inner{flex-wrap:wrap;padding-block:20px;gap:12px}.footer-inner p{order:3;width:100%}}
@media(max-width:560px){.header-link{font-size:11px;padding:9px}.brand{font-size:18px}.brand img{width:32px;height:32px}.availability-inner{gap:7px 10px}.availability-label{width:100%}.separator{display:none}.availability-inner span:not(.availability-label){font-size:11px}.lesson-grid,.feature-grid{grid-template-columns:1fr}.lesson-card{min-height:auto}.lesson-card-wide{grid-column:auto;display:flex;align-items:stretch;gap:0}.lesson-card-wide h3{margin:20px 0 10px}.lesson-card-wide .lesson-takeaway{padding-top:20px}.field-grid{grid-template-columns:1fr}.lab-card{padding:21px}.hero-actions{align-items:stretch}.hero-actions .button{width:100%}.nine-grid{margin-block:23px 28px}.hero-panel{padding:20px}.closing{padding-block:48px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}