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@media(max-width:380px){.site-header{padding-inline:18px;gap:10px}.site-header nav{gap:14px}.brand{font-size:23px}.brand svg{width:25px;margin-right:5px}.wrap{padding-inline:20px}.hero h1{font-size:44px}.hero-copy .actions{display:block}.hero-copy .text-link{display:block;margin-top:18px}.workbook-top{padding-inline:17px;font-size:8px}.sample-question{padding-inline:20px;font-size:24px}.interactive-rail{padding-inline:20px}.practice-band{margin-inline:20px;padding:27px}.tool{padding:23px 18px}.answer-option{padding:12px;gap:10px;font-size:14px}.consent-actions{justify-content:stretch}.consent-actions button{flex:1}}
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/* Keep the first useful action visible before supporting instructions. */
.tool-intro .start-instruction{margin:22px 0 14px;font-size:15px;line-height:1.65;max-width:470px}.tool-intro .practice-scope{font-size:12px;line-height:1.6;margin:0;max-width:470px}.tool-intro h2{margin-bottom:20px}
@media(max-width:760px){.tool-header{padding-top:36px;padding-bottom:24px}.tool-header h1{margin-bottom:20px}.tool-header .lead{margin-bottom:16px}.tool-header>p:last-child{margin-bottom:10px}.tool-intro .eyebrow{margin-bottom:14px}.tool-intro .start-instruction{font-size:14px;margin-top:20px}.tool-intro .practice-scope{font-size:11px}}

/* The step rail shows completed mathematical transformations. */
.guided-practice{border:1px solid #b7c9e2;border-left:4px solid var(--blue);border-radius:7px;margin:22px 0;background:var(--paper)}
.guided-practice>summary{padding:15px 18px;font-weight:700;color:var(--blue);cursor:pointer;min-height:48px}
.guided-body{padding:0 20px 22px}.guided-body h3{font-size:21px;line-height:1.4;letter-spacing:-.02em}.guided-body h4{font-size:17px;margin:18px 0 8px}.guided-body .eyebrow{margin-bottom:10px}
.guided-options{border:0;padding:0;margin:0 0 18px;display:grid;gap:9px}.guided-options label{display:flex;align-items:center;gap:12px;padding:11px 13px;border:1px solid var(--rule);background:var(--white);border-radius:6px;font-size:15px;cursor:pointer;min-height:48px}.guided-options input{accent-color:var(--blue);flex-shrink:0;width:18px;height:18px}.guided-options label:has(input:checked){border-color:var(--blue)}
.guided-feedback p,.guided-rail p{font-size:14px;margin:8px 0 14px}.guided-feedback code{display:block;margin-bottom:18px;color:var(--blue);overflow-wrap:anywhere}.guided-rail{list-style:none;margin:0 0 20px;padding:0}.guided-rail:empty{display:none}.guided-rail li{display:flex;gap:13px;align-items:flex-start;margin-bottom:15px}.guided-rail code{font-size:15px;overflow-wrap:anywhere}.guided-form .button,.guided-feedback .button{max-width:100%}
.app-next-step{border:1px solid var(--rule);border-top:3px solid var(--blue);border-radius:8px;background:var(--soft-blue);padding:26px;margin:32px 0}.app-next-step h3{margin-bottom:14px;font-size:26px}.app-next-step p{font-size:15px;line-height:1.7}.app-next-step .eyebrow{margin-bottom:13px}.app-next-step .actions{gap:15px}
.lesson-exercise{padding:24px 0;border-top:1px solid var(--rule)}.lesson-exercise .eyebrow{margin-bottom:10px}.lesson-exercise h3{font-size:21px;line-height:1.45;letter-spacing:-.02em}.lesson-exercise details{margin-bottom:0}.lesson-practice>p{color:var(--muted)}
@media(max-width:480px){.guided-body{padding-inline:13px}.guided-practice>summary{padding-inline:13px}.app-next-step{padding:20px}.guided-options label{padding:10px}.guided-body h3{font-size:19px}}
.table-wrap{overflow-x:auto;margin-block:24px}.practice-notes>p,.practice-notes h2,.practice-notes .table-wrap{max-width:780px}.practice-notes h2{font-size:29px;margin-top:40px}.practice-notes table{border-collapse:collapse;width:100%;font-size:15px;background:var(--white)}.practice-notes th,.practice-notes td{border-bottom:1px solid var(--rule);padding:12px 14px;text-align:left;vertical-align:top}.practice-notes thead th{font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}

.shot-row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}.shot-row figure{margin:0;text-align:center}.shot-row img{width:100%;height:auto;border:1px solid var(--rule);border-radius:14px;background:var(--white)}.shot-row figcaption{font-size:13px;color:var(--muted);margin-top:8px}
blockquote.passage{border-left:3px solid var(--amber);margin:12px 0;padding:4px 0 4px 18px;color:var(--ink)}.lesson-exercise ol[type="A"]{padding-left:26px;margin:10px 0}.simple-prose h3{margin-top:22px}
@media(max-width:760px){.shot-row{grid-template-columns:repeat(2,1fr)}}

/* 2026-11-14 site uplift: header, store buttons, gallery, hubs, guides */
.site-header{position:sticky;top:0;z-index:40;background:rgba(245,247,252,.94);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);padding-block:18px}
.header-cta{background:var(--ink);color:#fff;border-radius:999px;padding:10px 16px;white-space:nowrap}.header-cta:hover{background:var(--blue);color:#fff}
.button[data-store]{background:#0b1b2e;border-color:#0b1b2e;gap:10px;padding:13px 20px;border-radius:10px}.button[data-store]:hover{background:#000}.button[data-store] svg{width:20px;height:20px;flex:none;fill:currentColor}
.prose table,.article table{border-collapse:collapse;width:100%;font-size:15px;background:var(--white);border:1px solid var(--rule);border-radius:8px}.prose th,.prose td{border-bottom:1px solid var(--rule);padding:11px 14px;text-align:left;vertical-align:top;line-height:1.55}.prose thead th{font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);background:var(--soft-blue)}.prose tbody tr:nth-child(even){background:#f9fbfe}.prose caption{text-align:left;font-size:13px;color:var(--muted);padding:0 0 8px}
.guide{max-width:900px}.guide .article-header{margin-bottom:28px}.byline{max-width:760px;line-height:1.7}
.answer-box{background:var(--white);border:1px solid #c9d6f2;border-left:5px solid var(--amber);border-radius:10px;padding:24px 28px;margin:0 0 30px;max-width:820px}.answer-box .eyebrow{color:var(--blue);margin-bottom:10px}.answer-box ul{margin:0;padding-left:20px}.answer-box li{margin-bottom:8px;line-height:1.6}
.toc{border:1px solid var(--rule);border-radius:10px;padding:20px 26px;margin:0 0 44px;max-width:820px;background:#fbfcff}.toc .eyebrow{margin-bottom:8px;color:var(--muted)}.toc ol{margin:0;padding-left:20px;columns:2;column-gap:36px}.toc li{font-size:14px;margin-bottom:6px;break-inside:avoid}.toc a{text-decoration:none}.toc a:hover{text-decoration:underline}
.guide-prose{max-width:820px}.guide-prose h2{scroll-margin-top:90px}
div.worked{padding:20px 24px;margin:24px 0}div.worked p{margin-bottom:10px}div.worked .steps{margin:0 0 10px}div.worked .steps li{margin-bottom:6px}div.worked .worked-a{font-weight:700;color:var(--green);margin:0}
.tip{border-left:3px solid var(--amber);background:#fffaf0;padding:14px 20px;margin:22px 0;border-radius:0 8px 8px 0}.tip p{margin:0}
.practice-item h3{font-size:19px;letter-spacing:-.01em;line-height:1.45}.practice-item .choices{margin:0 0 14px}.practice-item .choices li{margin-bottom:4px}.practice-item details summary,.faq-item summary{cursor:pointer;font-weight:700;color:var(--blue)}
.faq-list{border-top:1px solid var(--rule)}.faq-item{border-bottom:1px solid var(--rule);padding:16px 0}.faq-item summary{color:var(--ink);font-size:17px;list-style-position:outside}.faq-item>div{padding-top:10px}.faq-item p{margin-bottom:8px}
.source-list li{margin-bottom:6px;font-size:15px}
.related-grid,.hub-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.related-card{display:flex;justify-content:space-between;gap:12px;align-items:center;background:var(--white);border:1px solid var(--rule);border-radius:10px;padding:16px 18px;text-decoration:none;color:var(--ink);font-weight:650;font-size:15px;line-height:1.4;transition:border-color .15s,transform .15s}.related-card:hover{border-color:#91a8dd;transform:translateY(-2px);color:var(--ink)}.related-card span:last-child{color:var(--blue)}
.hub{padding-block:44px;border-top:1px solid var(--rule)}.hub h2{margin-bottom:10px}.hub>p{color:var(--muted);max-width:640px}.hub-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.hub-grid .related-card{flex-direction:column;align-items:flex-start}.hub-grid .related-card small{font-weight:400;color:var(--muted);font-size:13px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border:1px solid var(--rule);border-radius:12px;background:var(--white);margin-top:10px}.stats div{padding:22px 24px;border-right:1px solid var(--rule)}.stats div:last-child{border-right:0}.stats b{display:block;font-size:30px;letter-spacing:-.04em;color:var(--blue);line-height:1.1}.stats span{font-size:13px;color:var(--muted)}
.hero-stores{margin-top:22px;display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.gallery{position:relative}.gallery-rail{display:flex;gap:22px;overflow-x:auto;scroll-snap-type:x mandatory;padding:8px 2px 18px;scrollbar-width:none;-ms-overflow-style:none}.gallery-rail::-webkit-scrollbar{display:none}.gallery-rail figure{margin:0;flex:none;scroll-snap-align:start;text-align:center}.gallery-rail button{border:0;padding:0;background:none;display:block;border-radius:22px}.gallery-rail img{display:block;height:auto;border-radius:22px;border:1px solid var(--rule);background:var(--white);box-shadow:0 14px 32px rgba(16,42,67,.12)}.gallery-rail .phone img{width:230px}.gallery-rail .tablet img{width:470px;border-radius:18px}.gallery-rail figcaption{font-size:13px;color:var(--muted);margin-top:10px}
.gallery-nav{display:flex;gap:10px;justify-content:flex-end;margin-bottom:12px}.gallery-nav button{width:42px;height:42px;border-radius:50%;border:1px solid #a9bbd3;background:var(--white);color:var(--ink);font-size:18px}.gallery-nav button:hover{background:var(--soft-blue)}
.lightbox{border:0;padding:0;background:transparent;max-width:min(94vw,1100px);max-height:94vh}.lightbox::backdrop{background:rgba(9,20,35,.86)}.lightbox img{display:block;max-width:100%;max-height:86vh;width:auto;height:auto;margin:auto;border-radius:16px}.lightbox form{text-align:right;margin-bottom:8px}.lightbox button{background:#fff;border:0;border-radius:999px;padding:8px 16px;font-weight:700}
.home-faq{max-width:860px}
.site-footer{grid-template-columns:1.4fr 1fr 1fr 1fr 1fr;background:#0f2238;color:#c8d4e6;max-width:none;border-top:0}.site-footer .brand{color:#fff}.site-footer p,.site-footer .fineprint{color:#9fb0c8}.footer-links a,.footer-links button{color:#d5deeb}.footer-links b{color:#fff;font-size:12px;font-family:var(--mono);text-transform:uppercase;letter-spacing:.07em;margin-bottom:4px}.site-footer .fineprint{border-top-color:#28405e}
@media(max-width:1050px){.hub-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.site-footer{grid-template-columns:1fr 1fr 1fr}.stats{grid-template-columns:repeat(2,1fr)}.stats div:nth-child(2){border-right:0}.stats div:nth-child(-n+2){border-bottom:1px solid var(--rule)}}
@media(max-width:760px){.site-header{flex-wrap:wrap;padding:14px 16px;gap:10px 14px}.site-header nav{order:3;width:100%;overflow-x:auto;scrollbar-width:none;gap:20px;padding-bottom:2px}.site-header nav::-webkit-scrollbar{display:none}.site-header nav a{white-space:nowrap}.header-cta{font-size:12px;padding:8px 13px}.wrap{padding-inline:16px}.toc ol{columns:1}.related-grid,.hub-grid{grid-template-columns:1fr}.answer-box{padding:18px}div.worked{padding:16px}.gallery-rail .phone img{width:200px}.gallery-rail .tablet img{width:min(86vw,420px)}.site-footer{grid-template-columns:1fr 1fr;padding:36px 16px 24px}.prose th,.prose td{padding:9px 10px;font-size:14px}}
.hub-links{list-style:none;padding:0;margin:0 0 20px}.hub-links li{padding:8px 0;border-bottom:1px solid var(--rule);font-size:15px;line-height:1.4}.hub-links a{text-decoration:none;font-weight:600}.hub-links a:hover{text-decoration:underline}.home-hubs{grid-template-columns:repeat(4,minmax(0,1fr))}@media(max-width:1050px){.home-hubs{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:760px){.home-hubs{grid-template-columns:1fr}}
@media(max-width:1180px) and (min-width:761px){.site-header nav{gap:22px}.header-cta span{display:none}}@media(max-width:960px) and (min-width:761px){.header-cta{display:none}}