.kb-article{display:grid;grid-template-columns:minmax(0,1fr) 190px;gap:36px;align-items:start}.kb-answer{border-left:3px solid var(--lh-brown);padding:4px 0 4px 22px;margin:14px 0 24px}.learning-hub .kb-answer>p:last-child{font-size:20px;line-height:1.6;margin:6px 0}.kb-why{color:var(--lh-muted)}.kb-section{scroll-margin-top:100px;padding:24px 0;border-bottom:1px solid var(--lh-line)}.learning-hub .kb-section h2{font-size:25px;line-height:1.35;margin:0 0 18px}.learning-hub .kb-section p{line-height:1.75;max-width:75ch;margin:14px 0}.kb-table-scroll{overflow-x:auto;margin:20px 0;border:1px solid var(--lh-line);border-radius:8px}.kb-table-scroll table{border-collapse:collapse;width:100%;text-align:left;font-size:15px}.kb-table-scroll td,.kb-table-scroll th{padding:15px;vertical-align:top;border-bottom:1px solid var(--lh-line);min-width:145px}.kb-table-scroll thead{background:var(--lh-soft)}.kb-table-scroll tbody th{font-weight:600}.kb-table-scroll tr:last-child td,.kb-table-scroll tr:last-child th{border-bottom:0}.kb-provenance{color:var(--lh-muted);font-size:12px}.kb-index{position:sticky;top:100px;padding-left:20px;border-left:1px solid var(--lh-line)}.kb-index nav,.kb-mobile-index details[open]{display:grid;gap:13px}.kb-index a,.kb-mobile-index a{color:var(--lh-muted);font-size:14px;line-height:1.5;text-decoration:none}.kb-index a:hover,.kb-mobile-index a:hover{text-decoration:underline;color:var(--lh-ink)}.kb-mobile-index{display:none}.kb-source-figure{max-width:340px;margin:24px auto}.kb-source-figure img{width:100%;height:auto;border-radius:8px}.kb-source-figure figcaption{font-size:14px;color:var(--lh-muted);margin-top:12px}.kb-practice,.kb-related{margin:28px 0}.kb-related button{display:flex;width:100%;justify-content:flex-start;text-align:left;margin:8px 0}.kb-library-search{display:flex;gap:12px;align-items:center;border:1px solid var(--lh-line);background:var(--lh-paper);border-radius:10px;padding:12px 18px;margin:24px 0}.kb-library-search input{width:100%;background:transparent;border:0;color:var(--lh-ink);padding:8px;min-width:0}.kb-collection{margin:28px 0;padding-bottom:20px;border-bottom:1px solid var(--lh-line)}.kb-collection>button{display:block;width:100%;text-align:left;background:transparent;border:0;border-radius:0;padding:14px 0}.kb-collection button span,.kb-collection button strong{display:block}.kb-collection button span{font-size:14px;line-height:1.6;color:var(--lh-muted);margin-top:5px;max-width:80ch}@media (max-width:1100px){.kb-article{grid-template-columns:minmax(0,1fr)}.kb-index{display:none}.kb-mobile-index{display:block;border-block:1px solid var(--lh-line);padding:16px 0;margin:24px 0}.kb-mobile-index summary{cursor:pointer;min-height:44px}}@media (max-width:600px){.learning-hub .kb-answer>p:last-child{font-size:18px}.learning-hub .kb-section h2{font-size:22px}.kb-table-scroll td,.kb-table-scroll th{min-width:130px;padding:12px}}.lh-photo{margin:0 0 24px;border:1px solid var(--lh-line);border-radius:12px;overflow:hidden;background:var(--lh-paper)}.lh-photo img{display:block;width:100%;height:auto;aspect-ratio:3/2;object-fit:contain;background:var(--lh-soft)}.lh-photo figcaption{padding:16px 20px}.learning-hub .lh-photo figcaption p{font-size:15px;line-height:1.5;margin:0 0 7px}.lh-photo small{font-size:12px;color:var(--lh-muted)}.lh-photo-fallback{padding:30px;background:var(--lh-soft);color:var(--lh-muted)}.lh-photo-compact{max-width:650px}.lh-photo-compact img{max-height:320px}.lh-pricing-reference{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:20px 0}.lh-pricing-reference>section{padding:20px;border:1px solid var(--lh-line);border-radius:9px;background:var(--lh-paper)}.learning-hub .lh-pricing-reference h3{font-size:17px}.learning-hub .lh-pricing-reference p{font-size:15px;margin:0}.lh-source-records{padding-left:23px}.lh-source-records li{padding:10px 0}.lh-source-records strong{display:block}.learning-hub .lh-concept-items section{padding:16px 0}.learning-hub .lh-concept-items p{font-size:16px}@media (max-width:700px){.learning-hub .lh-header{min-height:62px;padding:12px 16px;flex-wrap:nowrap}.learning-hub .lh-brand{font-size:17px;letter-spacing:3px;gap:8px}.learning-hub .lh-brand span{display:none}.learning-hub .lh-main{padding:16px}.learning-hub .lh-mobile-bar{margin-bottom:10px}.learning-hub .lh-breadcrumb{display:none}.learning-hub .lh-lesson-toolbar{margin-bottom:10px}.learning-hub .lh-lesson-toolbar+.lh-kicker{display:none}.learning-hub h1{font-size:29px;margin:8px 0 10px}.learning-hub .lh-lede{font-size:15px!important;line-height:1.5}.learning-hub .lh-lesson-progress{margin:14px 0}.learning-hub .lh-concept{padding:18px 14px}.learning-hub .lh-concept>.lh-kicker{display:none}.learning-hub .lh-concept h2{font-size:20px;margin-bottom:16px}.lh-photo figcaption{padding:14px}.lh-pricing-reference{grid-template-columns:1fr}.lh-photo-compact img{max-height:none}}.learning-welcome{--bg:#faf8f3;--paper:#fffdf9;--ink:#251b16;--muted:#665c54;--line:#e1d7c9;--soft:#f3ede3;--accent:#553629;--button:#edc994;--button-text:#251b16;background:var(--bg);color:var(--ink);font:16px/1.6 var(--font-geist-sans),Arial,sans-serif;min-height:100svh;display:flex;flex-direction:column;color-scheme:light}.learning-welcome[data-theme=dark]{--bg:#1d1713;--paper:#261e19;--ink:#fff4e7;--muted:#c9baad;--line:#594537;--soft:#30251f;--accent:#edc994;--button:#edc994;--button-text:#251b16;color-scheme:dark}@media(prefers-color-scheme:dark){.learning-welcome[data-theme=system]{--bg:#1d1713;--paper:#261e19;--ink:#fff4e7;--muted:#c9baad;--line:#594537;--soft:#30251f;--accent:#edc994;--button:#edc994;--button-text:#251b16;color-scheme:dark}}.learning-welcome *{box-sizing:border-box}.learning-welcome a{color:inherit;text-decoration:none}.learning-welcome button{font:inherit}.learning-welcome a:focus-visible,.learning-welcome button:focus-visible{outline:3px solid var(--accent);outline-offset:5px}.lw-header{width:min(1280px,100%);margin:auto;padding:30px 48px;justify-content:space-between}.lw-brand,.lw-header{display:flex;align-items:center}.lw-brand{font-size:30px;font-weight:800;letter-spacing:-1.5px;gap:20px}.lw-brand span{font-size:10px;letter-spacing:2.2px;font-weight:600;border-left:1px solid var(--line);padding-left:20px;color:var(--muted)}.lw-theme{display:flex;align-items:center;gap:9px;border:1px solid var(--line);background:transparent;color:var(--muted);border-radius:30px;padding:10px 15px;cursor:pointer;font-size:12px!important;min-height:44px}.lw-main{width:min(1184px,100%);margin:auto;display:grid;grid-template-columns:1.15fr 1fr;gap:100px;align-items:center;padding:62px 48px 84px;flex:1 1}.lw-eyebrow{font-size:10px;font-weight:700;letter-spacing:2px;color:var(--accent);margin:0 0 22px}.lw-intro h1{font-family:inherit;font-weight:550;font-size:clamp(43px,5vw,66px);line-height:1.08;letter-spacing:-2px;margin:0 0 25px}.lw-lead{font-size:17px;color:var(--muted);max-width:470px;margin:0 0 36px}.lw-outline{border-top:1px solid var(--line)}.lw-outline>div{display:flex;gap:20px;padding:17px 0;border-bottom:1px solid var(--line)}.lw-outline>div>span{font-size:11px;color:var(--accent);padding-top:4px;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.lw-outline p{margin:0}.lw-outline strong{display:block;font-size:14px;font-weight:600}.lw-outline small{display:block;font-size:12px;color:var(--muted);margin-top:2px}.lw-card{padding:39px 35px 26px;border:1px solid var(--line);border-radius:12px;background:var(--paper);box-shadow:0 18px 55px #251b1609}.lw-book{width:52px;height:52px;border-radius:14px;background:var(--soft);display:grid;place-items:center;color:var(--accent);margin-bottom:27px}.lw-card .lw-eyebrow{margin-bottom:9px}.lw-card h2{font-size:27px;line-height:1.25;letter-spacing:-.8px;margin:0 0 12px}.lw-card-intro{font-size:14px;color:var(--muted);margin:0 0 28px}.lw-signin{justify-content:center;align-items:center;gap:17px;width:100%;padding:15px;border:0;background:var(--button);color:var(--button-text);font-size:14px!important;font-weight:600!important;cursor:not-allowed}.lw-signin,.lw-status{display:flex;border-radius:8px}.lw-status{gap:10px;background:var(--soft);padding:14px;margin-top:14px}.lw-status-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);flex-shrink:0;margin-top:8px}.lw-status strong{font-size:12px;font-weight:600;display:block}.lw-status p{color:var(--muted);font-size:12px;line-height:1.6;margin:4px 0 0}.lw-divider{height:1px;background:var(--line);margin:25px 0 18px}.lw-command{display:flex;align-items:center;justify-content:center;gap:9px;min-height:44px;font-size:13px;font-weight:600}.lw-command:hover{text-decoration:underline}.lw-invite{align-items:center;justify-content:center;gap:7px;margin:12px 0 0}.lw-footer,.lw-invite{display:flex;font-size:11px;color:var(--muted)}.lw-footer{justify-content:space-between;gap:20px;padding:24px 48px;border-top:1px solid var(--line);width:min(1280px,100%);margin:auto}@media(max-width:900px){.lw-main{gap:45px;padding:38px 32px 60px}.lw-header{padding:24px 32px}.lw-card{padding:30px 25px}}@media(max-width:700px){.lw-main{grid-template-columns:1fr;gap:34px;padding:25px 22px 45px}.lw-header{padding:22px}.lw-theme span{display:none}.lw-intro h1{font-size:47px}.lw-lead{font-size:15px;margin-bottom:24px}.lw-outline{display:none}.lw-card{padding:28px 24px}.lw-book{margin-bottom:20px}.lw-footer{padding:22px;flex-direction:column;gap:5px}.lw-brand{font-size:26px;gap:14px}.lw-brand span{padding-left:14px}.lw-eyebrow{margin-bottom:16px}}.learning-hub{--lh-bg:#faf8f3;--lh-paper:#fffdf9;--lh-soft:#f3ede3;--lh-ink:#251b16;--lh-brown:#553629;--lh-muted:#665c54;--lh-line:#e1d7c9;--lh-gold:#edc994;--lh-active:#f5e7d1;--lh-focus:#755334;--lh-error:#8a3027;color-scheme:light;font-family:Inter,Arial,sans-serif;color:var(--lh-ink);background:var(--lh-bg);min-height:100vh;font-size:16px;line-height:1.6;isolation:isolate}.learning-hub[data-theme=dark]{--lh-bg:#1d1713;--lh-paper:#261e19;--lh-soft:#30251f;--lh-ink:#fff4e7;--lh-brown:#edc994;--lh-muted:#c9baad;--lh-line:#594537;--lh-active:#473421;--lh-focus:#edc994;--lh-error:#ffb9a6;color-scheme:dark}@media (prefers-color-scheme:dark){.learning-hub[data-theme=system]{--lh-bg:#1d1713;--lh-paper:#261e19;--lh-soft:#30251f;--lh-ink:#fff4e7;--lh-brown:#edc994;--lh-muted:#c9baad;--lh-line:#594537;--lh-active:#473421;--lh-focus:#edc994;--lh-error:#ffb9a6;color-scheme:dark}}.learning-hub *{box-sizing:border-box}.learning-hub button,.learning-hub input,.learning-hub select{font:inherit}.learning-hub a,.learning-hub button,.learning-hub select,.learning-hub summary{touch-action:manipulation}.learning-hub button{cursor:pointer;min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:10px 16px;border:1px solid var(--lh-line);border-radius:8px;background:var(--lh-paper);color:var(--lh-ink);font-size:14px;font-weight:600}.learning-hub button:hover{background:var(--lh-soft)}.learning-hub button:disabled{opacity:.55;cursor:default}.learning-hub .lh-primary{background:var(--lh-gold);border-color:var(--lh-gold);color:#251b16}.learning-hub .lh-primary:hover{background:#e3ba7e}.learning-hub :is(button,a,input,select,summary):focus-visible{outline:3px solid var(--lh-focus);outline-offset:3px}.learning-hub h1:focus{outline:none}.learning-hub a{color:var(--lh-brown);text-decoration:none}.learning-hub a:hover{text-decoration:underline;text-underline-offset:4px}.learning-hub h1{font-size:clamp(30px,3.3vw,45px);font-weight:600;letter-spacing:-.04em;line-height:1.13;margin:12px 0 18px}.learning-hub h2{font-size:25px;letter-spacing:-.025em;line-height:1.25;font-weight:600;margin:0 0 20px}.learning-hub h3{font-size:18px;line-height:1.4;font-weight:600;margin:0 0 10px}.learning-hub p{margin:0 0 16px}.learning-hub small{font-size:12px;line-height:1.5;color:var(--lh-muted)}.learning-hub svg{flex-shrink:0}.lh-sr{width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.lh-skip,.lh-sr{position:absolute}.lh-skip{left:16px;top:-80px;padding:12px;background:var(--lh-paper);z-index:30}.lh-skip:focus{top:12px}.lh-header{height:88px;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:0 38px;border-bottom:1px solid var(--lh-line);background:var(--lh-paper)}.learning-hub .lh-brand{display:flex;align-items:center;gap:22px;letter-spacing:5px;font-size:23px;font-weight:600;color:var(--lh-ink)}.lh-brand span{font-size:11px;letter-spacing:2px;font-weight:500;border-left:1px solid var(--lh-line);padding-left:22px}.lh-header-right{display:flex;align-items:center;gap:25px;font-size:13px}.lh-header-right>a{gap:8px}.lh-header-right>a,.lh-theme{display:flex;align-items:center}.lh-theme{gap:5px;padding:0 10px;border:1px solid var(--lh-line);border-radius:8px;color:var(--lh-muted);min-height:44px}.lh-theme select{border:0;background:transparent;color:var(--lh-ink);font-size:13px;min-height:42px;cursor:pointer;max-width:100px}.lh-theme option{background:var(--lh-paper);color:var(--lh-ink)}.lh-layout{display:grid;grid-template-columns:280px minmax(0,1fr);max-width:1600px;margin:auto}.lh-sidebar{padding:28px 18px;border-right:1px solid var(--lh-line);background:var(--lh-paper);position:sticky;top:0;height:100dvh;overflow:auto}.lh-side-heading{display:flex;justify-content:space-between;align-items:center}.learning-hub .lh-kicker{font-size:11px;text-transform:uppercase;letter-spacing:.12em;font-weight:600;color:var(--lh-brown);margin-bottom:12px}.lh-search{display:flex;align-items:center;gap:9px;border:1px solid var(--lh-line);border-radius:8px;padding:0 10px;color:var(--lh-muted);background:var(--lh-bg);margin-bottom:22px;min-height:44px}.lh-search input{width:100%;min-width:0;border:0;background:transparent;color:var(--lh-ink);padding:10px 0;font-size:14px}.lh-search input::placeholder{color:var(--lh-muted)}.learning-hub .lh-my-learning{width:100%;justify-content:flex-start;font-weight:500;border:0;margin-bottom:18px;background:var(--lh-soft)}.lh-my-learning small{margin-left:auto}.learning-hub .lh-my-learning.active{background:var(--lh-active)}.lh-course{margin-bottom:20px}.lh-course summary{cursor:pointer;min-height:44px;display:flex;align-items:center;justify-content:space-between;font-size:14px;font-weight:600;list-style:none;padding:4px 10px;color:var(--lh-brown)}.lh-course summary::-webkit-details-marker{display:none}.lh-course:not([open]) summary svg{transform:rotate(-90deg)}.learning-hub .lh-topic{border:0;border-radius:7px;width:100%;text-align:left;justify-content:flex-start;padding:10px;font-weight:400;line-height:1.45;font-size:14px;background:transparent;gap:10px;margin:1px 0}.learning-hub .lh-topic.active{background:var(--lh-active);font-weight:600}.lh-topic-icon{display:flex;width:18px;justify-content:center;align-items:center;color:var(--lh-brown)}.lh-dot,.lh-topic small{display:block}.lh-dot{border:1px solid var(--lh-line);width:9px;height:9px;border-radius:50%}.lh-dot.started{background:var(--lh-gold);border-color:var(--lh-brown)}.lh-coming{border-top:1px solid var(--lh-line);margin:28px 10px 0;padding-top:24px;color:var(--lh-muted);font-size:14px}.lh-coming p{margin:12px 0}.lh-main{width:100%;max-width:1100px;padding:35px clamp(24px,4vw,64px) 48px;min-width:0}.lh-mobile-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;color:var(--lh-muted);font-size:12px;min-height:20px}.learning-hub .lh-mobile{display:none}.lh-mobile-bar>span{margin-left:auto}.lh-lesson-toolbar{gap:20px;justify-content:space-between;margin-bottom:34px}.lh-breadcrumb,.lh-lesson-toolbar{display:flex;align-items:center;flex-wrap:wrap}.lh-breadcrumb{font-size:12px;color:var(--lh-muted);gap:8px}.lh-breadcrumb>span{max-width:260px}.lh-mode{display:flex;padding:4px;border:1px solid var(--lh-line);border-radius:10px;gap:3px;background:var(--lh-paper)}.learning-hub .lh-mode button{border:0;background:transparent;font-weight:500;min-height:38px;padding:8px 12px;font-size:13px}.learning-hub .lh-mode button[aria-pressed=true]{background:var(--lh-ink);color:var(--lh-paper)}.learning-hub .lh-lede{font-size:18px;color:var(--lh-muted);max-width:62ch;line-height:1.65;margin-bottom:28px}.lh-lesson-progress{display:flex;flex-wrap:wrap;justify-content:space-between;color:var(--lh-muted);font-size:12px;gap:10px;margin:30px 0 38px}.learning-hub progress{appearance:none;width:100%;height:4px;border:none;background:var(--lh-line);border-radius:2px;overflow:hidden}.learning-hub progress::-webkit-progress-bar{background:var(--lh-line)}.learning-hub progress::-webkit-progress-value{background:var(--lh-brown)}.learning-hub progress::-moz-progress-bar{background:var(--lh-brown)}.lh-concept{background:var(--lh-paper);border:1px solid var(--lh-line);border-radius:14px;padding:32px;margin-bottom:26px}.lh-concept-items{display:grid;gap:0}.lh-concept-items section{padding:22px 0;border-bottom:1px solid var(--lh-line)}.lh-concept-items section:first-child{padding-top:6px}.lh-concept-items section:last-child{border-bottom:0}.lh-concept-items p{white-space:pre-line;color:var(--lh-muted);max-width:68ch;margin:0}.learning-hub .lh-takeaway{padding:18px 20px;background:var(--lh-soft);border-left:3px solid var(--lh-gold);display:flex;gap:12px;align-items:flex-start;border-radius:0 8px 8px 0;margin:22px 0 0;font-size:15px}.lh-takeaway svg{margin-top:3px;color:var(--lh-brown)}.lh-source{margin-top:25px;font-size:12px;color:var(--lh-muted);overflow-wrap:anywhere}.lh-source summary{cursor:pointer;min-height:44px;display:flex;align-items:center;text-decoration:underline;text-underline-offset:4px}.lh-source p{margin:0 0 8px}.lh-lesson-actions{justify-content:space-between;gap:14px;margin:28px 0 18px}.lh-lesson-actions,.lh-save-status{display:flex;align-items:center;flex-wrap:wrap}.lh-save-status{gap:7px;min-height:34px;color:var(--lh-muted);font-size:12px}.lh-save-status>span:last-child{margin-left:auto}.lh-save-status button{font-size:12px}.lh-footer{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;border-top:1px solid var(--lh-line);margin-top:44px;padding-top:24px;color:var(--lh-muted);font-size:11px}.lh-lab{background:var(--lh-soft);padding:28px;border-radius:14px;margin-bottom:28px}.lh-lab>p{color:var(--lh-muted)}.lh-stage-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin:24px 0}.learning-hub .lh-stage-grid button{flex-wrap:wrap;justify-content:flex-start;text-align:left;align-content:center;padding:15px;min-height:92px}.lh-stage-grid button span{width:100%;font-size:11px;color:var(--lh-brown)}.lh-stage-grid button svg{margin-left:auto}.learning-hub button[aria-pressed=true]:not(.lh-mode button){background:var(--lh-active);border-color:var(--lh-brown)}.lh-stage-detail{min-height:65px}.lh-options{display:grid;gap:8px;margin-bottom:16px}.learning-hub .lh-options button{text-align:left;justify-content:flex-start;font-weight:400}.lh-check{background:var(--lh-paper);padding:28px;border:1px solid var(--lh-line);border-radius:14px;margin:24px 0}.lh-check-title{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:10px}.lh-check-title>span{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--lh-brown)}.lh-check h3{font-size:21px;margin-bottom:20px}.learning-hub fieldset{border:0;margin:0;padding:0;min-width:0}.lh-answer-options{display:grid;gap:9px;margin-bottom:20px}.lh-answer-options label{display:flex;align-items:flex-start;gap:12px;cursor:pointer;padding:14px 16px;border:1px solid var(--lh-line);border-radius:8px;min-height:48px}.lh-answer-options input{margin-top:5px;accent-color:var(--lh-brown);width:16px;height:16px;flex-shrink:0}.lh-answer-options label.is-selected{background:var(--lh-active);border-color:var(--lh-brown)}.lh-feedback{font-size:14px;background:var(--lh-soft);padding:16px;border-radius:8px;margin:18px 0!important;border-left:3px solid var(--lh-brown)}.lh-feedback strong{font-weight:600}.lh-error{color:var(--lh-error);font-size:14px;padding:12px 0}.lh-numeric{display:block;margin-bottom:20px;color:var(--lh-muted);font-size:14px}.lh-calculator input,.lh-numeric input{display:block;border:1px solid var(--lh-line);border-radius:8px;padding:11px 14px;background:var(--lh-bg);color:var(--lh-ink);width:100%;max-width:280px;margin-top:8px;font-size:16px}.lh-calculator{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.lh-calculator label{font-size:13px}.lh-calculator-results{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin:24px 0;padding-top:20px;border-top:1px solid var(--lh-line)}.lh-calculator-results span{display:block;font-size:13px;color:var(--lh-muted)}.lh-calculator-results strong{display:block;font-size:30px;font-weight:500}.lh-complete{display:flex;align-items:center;gap:20px;background:var(--lh-active);padding:24px;border-radius:12px;margin:28px 0}.lh-complete h2{margin:0 0 6px;font-size:22px}.lh-complete p{margin:0;font-size:14px}.lh-quick-answer{background:var(--lh-soft);padding:24px;border-radius:12px;margin:30px 0}.lh-quick-answer>p:not(.lh-kicker){font-size:19px;line-height:1.6}.lh-on-this-page{padding:25px 0;border-bottom:1px solid var(--lh-line);margin-bottom:35px}.lh-on-this-page h2{font-size:14px;margin:0 0 12px}.lh-on-this-page a{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:44px;font-size:14px}.lh-reference-section{scroll-margin-top:24px;margin-bottom:40px}.lh-reference-section>small{display:block;margin-top:10px}.lh-reference-section .lh-concept-items section{padding-top:12px;padding-bottom:16px}.lh-search-results>p{font-size:12px;color:var(--lh-muted)}.learning-hub .lh-search-results button{display:block;text-align:left;width:100%;padding:14px 10px;border:0;border-bottom:1px solid var(--lh-line);border-radius:0;background:transparent}.lh-search-results strong{display:block;font-size:14px;font-weight:600}.lh-search-results span{display:block;font-size:12px;color:var(--lh-muted);font-weight:400;margin-top:6px}.lh-overall{display:grid;gap:12px;margin:24px 0;font-size:14px}.lh-course-cards{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:36px 0}.lh-course-cards>section{padding:26px;background:var(--lh-paper);border:1px solid var(--lh-line);border-radius:12px}.lh-course-cards h2{margin:20px 0 12px;font-size:23px}.lh-course-cards p{color:var(--lh-muted);font-size:15px}.lh-course-cards button{display:flex;margin-top:20px}.lh-history-heading{font-size:20px!important}.lh-history{display:grid}.learning-hub .lh-history button{display:flex;justify-content:space-between;text-align:left;font-weight:400;border:0;border-bottom:1px solid var(--lh-line);border-radius:0;background:transparent;gap:20px;padding:14px 0}.lh-footnote{margin-top:24px!important;font-size:13px;color:var(--lh-muted)}.learning-access{padding:64px 24px;max-width:640px;margin:auto}.learning-access h1{font-size:32px;margin:16px 0}.learning-access a{text-decoration:underline}@media (min-width:1600px){.lh-main{padding-left:70px;padding-right:70px}}@media (max-width:1000px){.lh-layout{grid-template-columns:245px minmax(0,1fr)}.lh-main{padding:28px 28px 40px}.lh-stage-grid{grid-template-columns:1fr}.lh-stage-grid button{min-height:58px!important}.lh-stage-grid button span{width:auto}.lh-concept{padding:24px}.lh-calculator,.lh-course-cards{grid-template-columns:1fr}.lh-calculator input{max-width:none}}@media (max-width:700px){.lh-header{height:auto;min-height:76px;padding:16px 20px;gap:14px;flex-wrap:wrap}.learning-hub .lh-brand{font-size:20px;gap:14px}.lh-brand span{padding-left:14px;font-size:10px}.lh-header-right{gap:12px}.lh-header-right>a{display:none}.lh-layout{display:block}.lh-sidebar{position:relative;top:auto;height:auto;overflow:visible;border-right:0;border-bottom:1px solid var(--lh-line);display:none;padding:22px 20px}.lh-sidebar.is-open{display:block}.learning-hub .lh-mobile{display:inline-flex}.lh-main{padding:22px 20px 36px}.lh-lesson-toolbar{margin-bottom:26px;gap:16px}.lh-breadcrumb{width:100%}.lh-mobile-bar{margin-bottom:22px}.lh-lede{font-size:17px!important}.lh-check,.lh-concept,.lh-lab{padding:22px 18px}.lh-concept h2{font-size:23px}.lh-lesson-progress{margin:26px 0}.lh-lesson-actions button{font-size:13px;padding:10px 12px}.lh-save-status>span:last-child{margin-left:0;width:100%}.lh-calculator-results{grid-template-columns:1fr;gap:16px}.lh-history button{flex-wrap:wrap;gap:4px!important}.lh-footer{gap:10px}.lh-header .lh-theme select{font-size:12px}.lh-reference-section{scroll-margin-top:12px}}@media (prefers-reduced-motion:reduce){.learning-hub *{scroll-behavior:auto!important}}.lh-pricing-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0}.lh-receipt{background:var(--lh-paper);border:1px solid var(--lh-line);border-radius:10px;padding:24px;margin:20px 0}.lh-receipt>span{display:block;letter-spacing:.14em;font-size:11px;color:var(--lh-muted);margin-bottom:20px}.lh-receipt p{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-bottom:1px dashed var(--lh-line);padding:14px 0;margin:0!important}.lh-receipt p:last-child{border-bottom:0}.lh-receipt strong{font-weight:600}.lh-key-idea,.lh-recall{background:var(--lh-soft);padding:18px 20px;border-radius:10px}.lh-key-idea strong,.lh-recall strong{display:block;margin-bottom:6px}.lh-reading-controls{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin:14px 0}.lh-reading-controls>span,.lh-recall small{color:var(--lh-muted);font-size:14px}.lh-recall{margin-top:24px}.lh-lesson-outline{border-block:1px solid var(--lh-line);padding:14px 0;margin:20px 0}.lh-lesson-outline summary{cursor:pointer;min-height:44px;padding:8px 0}.lh-lesson-outline nav{display:grid;gap:7px}.lh-lesson-outline button{justify-content:flex-start;text-align:left}.lh-lesson-outline button[aria-current=step]{background:var(--lh-active);border-color:var(--lh-focus)}.learning-hub .lh-concept .lh-photo-compact{max-width:440px;margin-inline:auto}.learning-hub .lh-concept .lh-photo-compact img{max-height:230px}.lh-rehearsal{margin-top:24px;padding:22px;border:1px solid var(--lh-line);border-radius:10px;background:var(--lh-soft)}.lh-rehearsal-options{display:grid;gap:10px;margin:16px 0}.lh-rehearsal-options button{text-align:left;justify-content:flex-start;white-space:normal}.lh-rehearsal-options button[aria-pressed=true]{background:var(--lh-active);border-color:var(--lh-focus)}.lh-rehearsal-feedback{border-left:3px solid var(--lh-focus);padding:12px 16px}.lh-rehearsal small{color:var(--lh-muted)}