@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&display=swap');
:root{color-scheme:dark;font-family:Manrope,Arial,sans-serif;color:#e9eee7;background:#111713;--green:#b5f579;--muted:#9eaea0;--line:#ffffff12;--panel:#1b241d}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input,select{font:inherit}button,summary{cursor:pointer}button,a,input,select{touch-action:manipulation}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #c6b3fb;outline-offset:3px}.skip{position:fixed;top:-80px;left:20px;background:var(--green);color:#13220f;padding:15px;z-index:5}.skip:focus{top:10px}.topbar{height:78px;display:flex;align-items:center;gap:28px;padding:0 35px;border-bottom:1px solid var(--line);background:#111713}.brand{font-size:20px;font-weight:800;letter-spacing:-.6px;white-space:nowrap}.brand span{color:var(--green);font-size:27px;margin-right:8px}.brand small{display:block;font-size:10px;letter-spacing:2px;color:#8fa288;margin-left:34px;font-weight:500}.search-form{margin-left:auto;max-width:420px;flex:1;display:flex;gap:8px}.search-form input{width:100%;border:1px solid #364335;border-radius:9px;background:#1b241d;color:#e5eddf;padding:11px 14px;font-size:14px}.search-form button{border:0;background:#2d3b2b;color:#d9e8d1;border-radius:8px;padding:0 14px}.toplink{color:#c4d4bc;font-size:14px}.shell{display:grid;grid-template-columns:215px minmax(0,1fr);max-width:1550px;margin:auto}.sidebar{border-right:1px solid var(--line);padding:32px 18px;min-height:calc(100vh - 78px)}.nav-caption{font-size:10px;letter-spacing:1.8px;color:#778c78;margin:0 14px 12px}.sidebar nav{display:grid;gap:5px}.navlink{display:block;padding:11px 14px;font-size:14px;color:#a9b7a5;border-radius:8px}.navlink:hover{background:#202d20}.navlink.active{color:#c4f29f;background:#283922;font-weight:700}.nav-divider{border:0;border-top:1px solid var(--line);margin:22px 14px}.sidebar-note{color:#7c927c;font-size:12px;line-height:1.7;padding:15px 14px}.main{min-width:0;padding:38px 42px 55px;max-width:1250px;width:100%;margin:auto}.eyebrow{font-size:11px;letter-spacing:1.7px;color:#aac696;font-weight:700}.intro-row{display:flex;gap:30px;align-items:end;justify-content:space-between;margin-bottom:30px}h1{font-size:clamp(32px,3.1vw,46px);letter-spacing:-1.6px;line-height:1.15;margin:14px 0 16px;max-width:850px}h1 em{font-style:normal;color:var(--green)}.lead{color:#a8b7a1;font-size:16px;line-height:1.75;max-width:650px;margin:0}.mini-count{font-size:12px;color:#8fa486;white-space:nowrap;padding-bottom:5px}.hero-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:18px;margin:25px 0 35px}.feature{border:1px solid #4a6340;border-radius:17px;padding:27px;background:linear-gradient(130deg,#243321,#17241a);position:relative;overflow:hidden}.feature h2{font-size:29px;letter-spacing:-.7px;line-height:1.2;margin:14px 0}.feature p{font-size:14px;color:#b8c8ad;line-height:1.7;max-width:390px}.feature.alt{background:#252230;border-color:#494056}.feature.alt .eyebrow{color:#d0bdf8}.feature.alt .button{background:#c8b4fb;color:#251c38}.feature .diagram{background:transparent;margin:0 -10px;border:0}.feature svg{max-height:155px}.feature figcaption{display:none}.button{display:inline-flex;justify-content:center;align-items:center;border:0;padding:13px 18px;border-radius:9px;background:var(--green);color:#1e3115;font-size:14px;font-weight:800;line-height:1.45}.button:hover{filter:brightness(1.07)}.button.outline{background:transparent;border:1px solid #485e40;color:#c9ddb9}.section-heading{display:flex;justify-content:space-between;gap:20px;align-items:center;margin:30px 0 16px}.section-heading h2{font-size:22px;margin:0;letter-spacing:-.5px}.section-heading a{font-size:13px;color:#adc497}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.card{padding:21px;background:var(--panel);border:1px solid #34432e;border-radius:13px;display:flex;flex-direction:column;gap:12px;min-width:0}.card:hover{border-color:#739555}.tag{font-size:10px;letter-spacing:1px;color:#b5d599;text-transform:uppercase}.tag.pro{color:#c9b5f8}.card h3{font-size:19px;letter-spacing:-.35px;line-height:1.4;margin:0}.card p{font-size:14px;line-height:1.7;color:#99af93;margin:0}.card-bottom{margin-top:auto;padding-top:6px;font-size:12px;color:#83977d;display:flex;justify-content:space-between;gap:10px}.toolcards{display:grid;grid-template-columns:1fr 1fr;gap:15px}.toolcard{border:1px solid #3d4e33;border-radius:13px;padding:23px;background:#1b251b}.toolcard h3{font-size:19px;margin:10px 0}.toolcard p{color:#a4b69a;font-size:14px;line-height:1.7}.tool-icon{font-size:26px;color:var(--green)}.bread{display:flex;flex-wrap:wrap;gap:9px;color:#8fa486;font-size:12px;margin-bottom:23px}.bread a:hover{text-decoration:underline}.article-head{max-width:850px}.meta{display:flex;gap:18px;flex-wrap:wrap;font-size:12px;color:#8ba07f;margin:20px 0 28px}.article-layout{display:grid;grid-template-columns:minmax(0,730px) 190px;gap:40px;align-items:start}.article-body{min-width:0}.article-body h2{font-size:25px;letter-spacing:-.5px;margin:34px 0 15px;scroll-margin-top:20px}.article-body p{font-size:16px;color:#bac7b1;line-height:1.95;margin:0 0 17px}.article-body a{color:#b9e596;text-decoration:underline}.toc{position:sticky;top:25px;border-left:1px solid #364731;padding-left:18px}.toc strong{display:block;font-size:12px;letter-spacing:1px;margin-bottom:13px;color:#9db98b}.toc a{display:block;font-size:12px;line-height:1.6;color:#8fa77f;padding:7px 0}.diagram{margin:25px 0;background:#1a251c;border:1px solid #384a32;border-radius:14px;overflow:hidden}.diagram svg{width:100%;display:block}.diagram text{font-family:Manrope,Arial,sans-serif;fill:#ddedce;font-size:17px}.diagram .overlay{opacity:0;transition:opacity .35s}.diagram[data-open=true] .overlay{opacity:1}.diagram figcaption{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;border-top:1px solid var(--line);font-size:11px;color:#7e9971}.text-button{border:0;background:transparent;color:#bbeb95;padding:6px 0;font-size:12px}.quiz{margin:28px 0;border:1px solid #576443;background:#252e1e;padding:23px;border-radius:14px}.quiz h3{font-size:18px;line-height:1.5;margin:10px 0 15px}.quiz-options{display:flex;flex-wrap:wrap;gap:9px}.quiz button{border:1px solid #5f6e4b;background:#303c26;border-radius:8px;color:#e1eccf;padding:11px 14px;font-size:14px}.quiz button.correct{background:#b5f579;color:#183014}.quiz button.wrong{background:#663e33;color:#ffe3cb}.quiz .quiz-feedback{font-size:14px;line-height:1.7;margin:14px 0 0;color:#d2e7bf}.sources{border-top:1px solid #394930;padding-top:20px;margin-top:28px}.sources h3{font-size:15px}.sources li{font-size:13px;line-height:1.7;margin-bottom:8px}.sources a{color:#a4bc95}.related{margin-top:35px}.callout{background:#252330;border:1px solid #4c435d;padding:23px;border-radius:13px;margin-top:30px}.callout h3{margin:0 0 10px}.callout p{font-size:13px;line-height:1.8;color:#b9afc9}.calc-layout{display:grid;grid-template-columns:310px minmax(0,1fr);gap:22px;align-items:start;margin-top:28px}.calc-form{background:#202b1e;border:1px solid #46563a;padding:23px;border-radius:14px;display:grid;gap:17px}.field{display:grid;gap:8px;font-size:13px;color:#c4d3b6}.field input,.field select{width:100%;min-width:0;padding:12px 11px;background:#121c12;border:1px solid #4a5b3d;color:#e8f2de;border-radius:7px;font-size:16px}.field small{font-size:11px;color:#8da47d;line-height:1.6}.calc-output{min-width:0}.metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:11px}.metric{padding:17px;background:#202c1d;border-radius:11px;border:1px solid #405236}.metric b{font-size:23px;letter-spacing:-.6px;display:block;margin:9px 0;overflow-wrap:anywhere}.metric span{font-size:11px;color:#96af85}.notice{font-size:13px;line-height:1.8;background:#28351f;border:1px solid #485e34;color:#c8dab6;border-radius:10px;padding:15px;margin:16px 0}.notice.warn{background:#392a21;border-color:#705239;color:#edd0b2}.notice.error{background:#3b2726;color:#f8b8af;border-color:#6b3c37}.table-scroll{overflow:auto;border:1px solid #35482d;border-radius:11px;margin-top:18px;max-height:430px}table{border-collapse:collapse;width:100%;font-size:13px;white-space:nowrap}th,td{text-align:right;border-bottom:1px solid #ffffff0c;padding:12px}th{color:#a6bf93;font-size:11px;background:#202e1c;position:sticky;top:0}th:first-child,td:first-child{text-align:left}tr.blocked{background:#482d23;color:#ffd2b3}.chart-output{background:#1a251b;border-radius:13px;margin:17px 0;padding:12px}.chart-output svg{width:100%;display:block}.chart-output text{font:12px Manrope,Arial,sans-serif;fill:#9bb889}.chart-legend{display:flex;gap:17px;font-size:11px;color:#adca97;padding:6px}.formula{font-family:monospace;background:#192218;padding:13px;border-radius:8px;overflow:auto;color:#cbe0b8}.help{margin-top:30px;font-size:14px;color:#a1b894;line-height:1.9}.help h2{font-size:21px}.glossary{display:grid;gap:12px}.glossary details{padding:18px 21px;border:1px solid #3a4c31;background:#1b271b;border-radius:11px}.glossary summary{font-size:18px;font-weight:700}.glossary p{font-size:15px;color:#a8bd99;line-height:1.8}.glossary a{color:var(--green);font-size:13px}.empty{padding:30px;border:1px dashed #4c6040;border-radius:13px;color:#aec59e;font-size:16px;line-height:1.8}.footer{border-top:1px solid var(--line);padding-top:25px;margin-top:45px;color:#778e6d;font-size:11px;line-height:1.8}.footer a{color:#a1bd8e}.footer-row{display:flex;justify-content:space-between;gap:20px;margin-bottom:10px}.noscript{color:#d6c4a1;font-size:13px}.path-steps{display:flex;flex-wrap:wrap;gap:8px;margin:24px 0}.path-steps a{border:1px solid #3e5732;border-radius:25px;padding:9px 14px;color:#bcd5aa;font-size:13px}.path-steps a:hover{background:#293d22}.result-count{color:#a2b792;font-size:13px;margin-bottom:16px}@media(max-width:1100px){.shell{grid-template-columns:175px minmax(0,1fr)}.main{padding:30px 25px}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.article-layout{grid-template-columns:1fr}.toc{display:none}.calc-layout{grid-template-columns:260px minmax(0,1fr)}.metrics{grid-template-columns:1fr}.metric{padding:12px 16px}.metric b{font-size:25px;margin:5px 0}.hero-grid{grid-template-columns:1fr 1fr}.feature{padding:22px}}@media(max-width:760px){.topbar{height:auto;padding:16px 18px;flex-wrap:wrap;gap:14px}.brand{font-size:18px}.brand small{font-size:9px}.toplink{margin-left:auto}.search-form{order:3;flex-basis:100%;max-width:none}.search-form input{font-size:14px}.shell{display:block}.sidebar{padding:10px 14px;border-right:0;border-bottom:1px solid var(--line);min-height:0;overflow:auto}.sidebar nav{display:flex;width:max-content;gap:3px}.nav-caption,.nav-divider,.sidebar-note{display:none}.navlink{padding:9px 12px;font-size:12px}.main{padding:25px 18px 35px}h1{font-size:34px;letter-spacing:-1px}.intro-row{display:block}.mini-count{margin-top:17px}.hero-grid{grid-template-columns:1fr;margin-bottom:25px}.feature h2{font-size:27px}.feature.alt{padding:22px}.feature .diagram{display:none}.cards{grid-template-columns:1fr}.toolcards{grid-template-columns:1fr}.card{padding:19px}.card h3{font-size:20px}.section-heading h2{font-size:21px}.section-heading a{font-size:12px}.article-body h2{font-size:24px}.article-body p{font-size:16px;line-height:1.85}.diagram figcaption{flex-direction:column;align-items:start;gap:3px}.diagram text{font-size:21px}.article-head h1{font-size:33px}.calc-layout{grid-template-columns:1fr}.calc-form{grid-template-columns:1fr 1fr;padding:18px;gap:15px}.calc-form .full{grid-column:1/-1}.metrics{grid-template-columns:1fr 1fr}.metric:first-child{grid-column:1/-1}.metric b{font-size:26px}.field{font-size:12px}.field input,.field select{font-size:16px;padding:11px 8px}.quiz-options{flex-direction:column}.quiz button{width:100%;text-align:left}.footer-row{flex-direction:column;gap:6px}.lead{font-size:15px}}@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}[hidden]{display:none!important}

.lesson-controls{display:flex;flex-wrap:wrap;gap:8px;padding:14px}.lesson-controls button{font:inherit;font-size:14px;min-height:44px;padding:8px 12px;background:#243224;color:#e4efdb;border:1px solid #61794f;border-radius:8px;cursor:pointer}.lesson-controls button[aria-pressed=true]{background:#b5f579;color:#182912}.lesson-controls button:focus-visible{outline:3px solid #c4adff;outline-offset:3px}.lesson-demo [hidden]{display:none!important}.lesson-caption{padding:0 16px 12px;margin:0!important;font-size:14px!important}.lesson-demo figcaption{padding:12px 16px}.lesson-demo svg text{font-size:18px}@media(max-width:600px){.lesson-controls{padding:10px;gap:6px}.lesson-controls button{flex:1 1 auto}.lesson-demo svg{min-height:190px}}