:root{--paper:#fff;--ink:#25292d;--muted:#5a6066;--line:#cdd1d4;--lime:#a8da8e;--white:#fff;--shadow:0 14px 35px #00000008}*{box-sizing:border-box}body{background:var(--paper);color:var(--ink);margin:0;font-family:Arial,Helvetica,sans-serif;font-size:15px;line-height:1.6}.site-shell{flex-direction:column;min-height:100dvh;display:flex}.site-shell>main{flex:1;min-width:0}.site-shell>footer{flex-shrink:0}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}:focus-visible{outline-offset:4px;outline:3px solid #31556d}h1,h2,h3,h4{letter-spacing:-.025em;margin:0;font-family:Arial,Helvetica,sans-serif;font-weight:700;line-height:1.17}h1{font-size:clamp(30px,4vw,44px)}h2{font-size:32px}h3{font-size:23px}p{color:var(--muted);margin:14px 0}.site-header{border-bottom:1px solid var(--line);z-index:30;background:#f1f2f3ef;position:sticky;top:0}.header-inner{align-items:center;gap:30px;max-width:1360px;min-height:76px;margin:auto;padding:16px 44px;display:flex}.wordmark{letter-spacing:.01em;white-space:nowrap;align-items:center;gap:10px;font-size:24px;font-weight:800;display:flex}.brand-icon{color:#fff;letter-spacing:0;border-bottom:3px solid var(--lime);background:#45494d;border-radius:3px;justify-content:center;align-items:center;width:48px;height:38px;font-size:20px;display:flex}.brand-icon span{align-self:flex-end;margin-bottom:8px;font-size:12px}.main-nav{flex:1;justify-content:center;align-items:center;gap:24px;display:flex}.main-nav a{color:var(--muted);white-space:normal;align-items:center;gap:7px;min-height:44px;font-size:18px;display:flex}.main-nav svg{flex-shrink:0}.main-nav a.active,.main-nav a:hover{color:var(--ink)}.main-nav a.active{font-weight:700;box-shadow:inset 0 -3px #397344}.header-actions{align-items:center;gap:18px;display:flex}.header-actions select{color:var(--ink);background:0 0;border:0;width:168px;min-height:48px;font-size:16px}.button{border:1px solid #0000;border-radius:3px;justify-content:center;align-items:center;gap:18px;min-height:50px;padding:12px 22px;font-size:14px;font-weight:600;line-height:1.5;transition:background-color .15s;display:inline-flex}.button:hover{filter:brightness(.94)}.button.dark{color:#fff;background:#397344}.button.light{background:var(--lime);color:var(--ink)}.button.outline{background:0 0;border-color:#9ba2a8}.button.small{min-height:44px;padding:9px 14px;font-size:12px}.text-link{align-items:center;gap:10px;font-size:14px;font-weight:600;display:inline-flex}.text-link:hover{text-decoration:underline}.page{max-width:1280px;margin:auto;padding:0 44px}.eyebrow{letter-spacing:2px;align-items:center;gap:8px;font-size:10px;font-weight:700;display:flex}footer{background:#e4e6e8;padding:20px max(24px,50vw - 596px)}.footer-bottom{color:var(--muted);flex-wrap:wrap;font-size:11px}.footer-bottom>div{flex-wrap:wrap;gap:12px 24px;display:flex}.mobile-menu{display:none}.icon-button{min-width:44px;min-height:44px;color:inherit;background:0 0;border:0;place-items:center;padding:7px;display:grid}.skip-link{z-index:100;background:#fff;padding:10px;position:absolute;top:-60px;left:20px}.skip-link:focus{top:10px}.notice-bar{text-align:center;background:#e9edef;padding:12px;font-size:13px}.notice-bar button{background:0 0;border:0;text-decoration:underline}.page-heading{max-width:800px;padding:36px 0 24px}.page-heading h1{margin-top:12px;font-size:36px}.page-heading p{font-size:16px;line-height:1.75}.toolbar{flex-wrap:wrap;align-items:center;gap:12px;margin:10px 0 25px;display:flex}.search{flex:1;min-width:220px}.field,input,select,textarea{color:var(--ink);background:#fff;border:1px solid #bcc3c8;border-radius:3px;min-height:46px;padding:12px 14px}label{font-size:13px;font-weight:600;display:block}.field-label{align-items:center;gap:10px;display:flex}textarea{width:100%;min-height:150px}.chips{flex-wrap:wrap;gap:8px;display:flex}.chip{border:1px solid var(--line);background:#fff;border-radius:3px;min-height:44px;padding:9px 15px;font-size:12px}.chip.active{background:var(--ink);color:#fff}.visually-hidden{clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.page.study-page{overflow-wrap:anywhere;padding-top:32px;padding-bottom:48px}.study-sections{grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;display:grid}.study-section{background:#fff;border:1px solid #adb7bf;border-top:5px solid #45494d;border-radius:3px;flex-direction:column;padding:25px;display:flex}.study-section:hover{background:#f9fcf8;border-color:#397344}.study-section-top,.study-section-bottom{justify-content:space-between;align-items:center;gap:16px;display:flex}.study-section-top{color:#31556d}.study-section-top span{color:var(--muted);font-size:12px}.study-section h2{flex:1;margin:24px 0 28px;font-size:24px;line-height:1.25}.code-choice{text-align:left;color:var(--ink);overflow-wrap:anywhere;min-height:230px}.code-choice-title{flex:1;margin:24px 0;font-size:24px;font-weight:700;line-height:1.3}.code-choice-icon{flex-shrink:0;width:80px;height:64px;display:block}.code-start>h2{margin-bottom:24px}.code-start>.button{margin-top:24px}.study-section-progress{color:var(--muted);font-size:13px}.study-section progress{appearance:none;background:#e4e8e3;border:none;width:100%;height:5px;margin:10px 0 22px;display:block}.study-section progress::-webkit-progress-bar{background:#e4e8e3}.study-section progress::-webkit-progress-value{background:#397344}.study-section progress::-moz-progress-bar{background:#397344}.study-section-bottom{color:#397344}.study-section-bottom>span,.study-section-score{color:var(--muted);font-size:12px}.study-section-bottom strong,.study-section-score strong{color:var(--ink);margin-top:4px;font-size:20px;display:block}.study-back{color:#31556d;align-items:center;gap:9px;min-height:44px;font-size:14px;display:inline-flex}.study-list-heading{justify-content:space-between;align-items:center;gap:20px;margin:18px 0 24px;display:flex}.study-list-heading h1{margin-bottom:10px;font-size:30px;line-height:1.2}.study-list-heading p{margin:0;font-size:14px}.study-section-score{text-align:right;flex-shrink:0}.study-topic-list,.study-lessons{margin:0;padding:0;list-style:none}.study-topic-list{padding-top:1px}.study-topic-row{cursor:pointer;list-style:none}.study-topic-row::-webkit-details-marker{display:none}.study-topic-row:focus-visible,.study-lesson-row:focus-visible,.progress-topic-row:focus-visible{outline-offset:-3px}.study-topic-row:hover,.progress-topic-row:hover,.study-lessons a:hover{background:#f5f6f7}.study-topic-title{flex:1;min-width:0}.disclosure-toggle{color:#397344}.disclosure-toggle:before{content:"+"}details[open]>summary .disclosure-toggle:before{content:"−"}.study-topic-group[open]>summary{background:#f4f5f6}.study-lessons a{font-size:14px}.study-lesson-row .topic-title{padding-left:28px;font-weight:400}.study-options{color:var(--muted);margin-top:24px;font-size:13px}.study-options>summary{cursor:pointer;align-items:center;gap:12px;width:fit-content;min-height:44px;padding:12px 0;list-style:none;display:flex}.study-options>summary::-webkit-details-marker{display:none}.study-options .content-panel{background:0 0;border:0;padding:0}@media (max-width:650px){.page.study-page{padding-top:22px;padding-bottom:30px}.study-sections{grid-template-columns:1fr;gap:12px}.study-section{padding:18px}.study-section h2{margin:14px 0 18px;font-size:21px}.code-choice{min-height:180px}.code-choice-title{margin:16px 0;font-size:21px}.study-section progress{margin-bottom:14px}.study-list-heading h1{font-size:23px}.study-list-heading{display:block}.study-section-score{text-align:left;align-items:baseline;gap:8px;margin-top:10px;display:flex}.study-section-score strong{margin:0;font-size:16px}}.article-grid{grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:50px;display:grid}.article-card{border:1px solid var(--line);background:#fff;border-radius:3px;flex-direction:column;align-items:flex-start;min-height:245px;padding:23px;display:flex}.article-card:hover{border-color:#31556d}.tag{text-transform:uppercase;letter-spacing:1px;color:#4e5962;background:#e9edef;border-radius:4px;padding:3px 7px;font-size:10px;display:inline-block}.article-card h2{margin-top:17px;font-size:21px}.article-card p{flex:1;font-size:13px}.article-card .text-link{font-size:12px}.article-header{justify-content:space-between;align-items:flex-start;gap:24px;display:flex}.article-header .page-heading{overflow-wrap:anywhere;flex:1;min-width:0}.article-header>.article-actions{padding-top:36px}.article-actions{justify-content:flex-end;display:flex}.article-actions[hidden]{display:none}.article-actions[data-top-visible=true]{visibility:hidden}.article-layout{padding-bottom:50px}.article-layout>.prose{max-width:800px}.article-layout>.article-actions{margin-top:28px}.article-read-end{height:1px}.lesson-progress{z-index:20;background:var(--paper);border-bottom:1px solid var(--line);align-items:center;gap:12px;padding:10px 0;font-size:12px;line-height:1.4;display:flex;position:sticky}.lesson-progress>span{max-width:45%}.lesson-progress strong{text-align:right;font-variant-numeric:tabular-nums;min-width:4ch}.lesson-progress progress{appearance:none;color:#397344;background:#dce1dc;border:0;border-radius:3px;flex:1;min-width:0;height:6px;overflow:hidden}.lesson-progress progress::-webkit-progress-bar{background:#dce1dc}.lesson-progress progress::-webkit-progress-value{background:#397344}.lesson-progress progress::-moz-progress-bar{background:#397344}.lesson-navigation{border-top:1px solid var(--line);grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:32px;padding-top:24px;display:grid}.lesson-nav-button{text-align:left;overflow-wrap:anywhere;background:#fff;border:1px solid #a9b2b9;border-radius:5px;flex-direction:column;justify-content:center;gap:4px;min-width:0;min-height:68px;padding:12px 16px;display:flex}.lesson-nav-next{text-align:right}.lesson-nav-button span{color:var(--muted);font-size:12px}a.lesson-nav-button:hover{background:#e9eee9;border-color:#397344}.prose{font-size:17px;line-height:1.85}.prose p{color:#45494d}.prose ul,.prose ol{padding-left:22px}.prose h2{margin:30px 0 15px;font-size:28px}.asset{object-fit:contain;background:#fff;width:100%;max-width:100%;height:300px;margin:20px auto;padding:8px;display:block}.question-assets{flex-wrap:wrap;justify-content:center;gap:16px;margin:16px 0;display:flex}.question-asset-link,.question-assets .controls-diagram-trigger{flex:160px;min-width:0;max-width:480px}.question-asset{height:220px;margin:0}.asset-link{border:1px solid var(--line);border-radius:3px;padding:8px;display:block}.content-panel{border:1px solid var(--line);background:#fff;border-radius:3px;margin:20px 0;padding:28px}.content-panel h2{font-size:25px}.muted{color:var(--muted)}.small-text{font-size:12px}.error{color:#842f20;background:#fff1ec;border:1px solid #d1a093;border-radius:3px;margin:15px 0;padding:14px}.success{background:#f0f8df;border:1px solid #98b476;border-radius:3px;margin:15px 0;padding:14px}.empty{text-align:center;background:#e9edef;border-radius:3px;margin-bottom:35px;padding:50px 25px}.metrics{grid-template-columns:repeat(4,1fr);gap:15px;margin:20px 0;display:grid}.metric{border:1px solid var(--line);background:#fff;border-radius:3px;padding:20px}.metric strong{font:700 34px Arial,sans-serif;display:block}.metric span{color:var(--muted);font-size:12px}.progress-grid{grid-template-columns:2fr 1fr;gap:25px;display:grid}.progress-overview{border:1px solid var(--line);background:#fff;border-radius:3px;padding:28px}.progress-overview-heading,.progress-reading-count,.progress-category-score,.progress-topic-heading{justify-content:space-between;align-items:center;gap:16px;display:flex}.progress-overview h2{overflow-wrap:anywhere;min-width:0;font-size:23px}.progress-overview-heading>strong{font-variant-numeric:tabular-nums;font-size:32px}.progress-overview progress{appearance:none;color:#397344;background:#e4e9e4;border:0;border-radius:6px;width:100%;height:12px;margin:18px 0 12px;display:block;overflow:hidden}.progress-overview progress::-webkit-progress-bar{background:#e4e9e4}.progress-overview progress::-webkit-progress-value{background:#397344}.progress-overview progress::-moz-progress-bar{background:#397344}.progress-reading-count,.progress-category-score{font-size:14px;line-height:1.4}.progress-reading-count>span,.progress-category-score>span{color:var(--muted)}.progress-reading-count strong{white-space:nowrap;font-variant-numeric:tabular-nums}.progress-overview p{margin:10px 0 0;font-size:13px}.progress-categories{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:24px 0;display:grid}.progress-category{border:1px solid var(--line);text-align:left;min-width:0;color:var(--ink);background:#fff;border-radius:3px;flex-direction:column;padding:22px;display:flex}.progress-category:hover{border-color:#397344}.progress-category[aria-selected=true]{background:#f7fbf4;border-color:#397344;box-shadow:inset 0 3px #397344}.progress-category-title{overflow-wrap:anywhere;align-items:flex-start;gap:10px;margin-bottom:22px;font-size:18px;font-weight:700;line-height:1.3;display:flex}.progress-category-title svg{color:#397344;flex-shrink:0}.progress-category>.progress-reading-count{margin-top:auto}.progress-category>.progress-reading-count,.progress-category>.progress-category-score{width:100%}.progress-category-meter{background:#e4e9e4;border-radius:3px;width:100%;height:6px;margin:12px 0 18px;overflow:hidden}.progress-category-meter>span{background:#397344;height:100%;display:block}.progress-category-score strong{text-align:right}.progress-topic-heading .text-link{flex-shrink:0;align-items:center;gap:8px;font-size:14px;display:flex}.progress-topic-heading h2{overflow-wrap:anywhere;min-width:0}.topic-columns{border:1px solid var(--line);background:#fff;grid-template-columns:minmax(0,1fr) minmax(100px,20%) minmax(90px,16%);align-items:center;margin-top:-1px;display:grid}.topic-cell{overflow-wrap:anywhere;justify-content:center;align-items:center;min-width:0;padding:16px 12px;display:flex}.topic-title{justify-content:flex-start;gap:10px;font-weight:600}.progress-topic-row:hover .topic-title{text-decoration:underline}.topic-concepts,.topic-score{text-align:center;font-variant-numeric:tabular-nums}.topic-columns:has(>.topic-title[data-read=true]){background:#e4f1df;border-color:#7eaa75}.progress-topic-list{margin:20px 0 0;padding:1px 0 0;list-style:none;display:grid}.progress-more>summary{cursor:pointer;overflow-wrap:anywhere;justify-content:space-between;align-items:center;gap:16px;font-size:18px;font-weight:700;list-style:none;display:flex}.progress-more>summary::-webkit-details-marker{display:none}.progress-more>summary svg{flex-shrink:0}.progress-more[open]>summary svg{transform:rotate(180deg)}.progress-more .metrics{grid-template-columns:repeat(3,minmax(0,1fr))}@media (max-width:700px){.progress-categories{grid-template-columns:1fr;gap:12px}.progress-category{padding:18px}.progress-category-title{margin-bottom:14px}.progress-category-meter{margin-bottom:12px}.progress-overview,.progress-topics,.progress-more{padding:20px}.progress-overview h2{font-size:20px}.progress-overview-heading>strong{font-size:27px}.progress-overview-heading{align-items:flex-start}.topic-columns{grid-template-columns:minmax(0,1fr) 23% 22%}.topic-cell{padding:14px 6px;font-size:14px;line-height:1.5}.study-lesson-row .topic-title{padding-left:14px}.progress-more .metrics{grid-template-columns:1fr}}.topic-row{border-bottom:1px solid var(--line);padding:16px 0}.topic-head{justify-content:space-between;gap:10px;font-size:13px;display:flex}.meter{background:#e4e6e8;border-radius:3px;height:7px;margin:10px 0;overflow:hidden}.meter>span{background:#397344;height:100%;display:block}.meter.weak>span{background:#c5815f}.topic-meta{color:var(--muted);font-size:11px}.history-row{border-bottom:1px solid var(--line);justify-content:space-between;gap:15px;padding:15px 0;font-size:13px;display:flex}.actions-panel{margin-bottom:50px}.actions-panel .button{margin:10px 10px 0 0}.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.modal-backdrop{z-index:99;background:#20252a66;place-items:center;padding:24px;display:grid;position:fixed;inset:0}.modal{background:#fff;border-radius:3px;max-width:480px;padding:30px;box-shadow:0 20px 100px #0004}.modal h2{font-size:24px}.modal .button-row{margin-top:20px}.simulator{color:#111;background:#fff;border:2px solid #31556d;flex-direction:column;min-height:600px;margin:20px 0 45px;font-family:Arial,sans-serif;display:flex;position:relative;box-shadow:0 0 0 3px #d8d8d8}.sim-header{background:#bdbdbd;justify-content:space-between;align-items:center;gap:15px;min-height:42px;padding:9px 12px;font-size:14px;font-weight:700;display:flex}.sim-header button,.sim-footer button,.sim-button{color:#111;background:linear-gradient(#f5f5f5,#d3d3d3);border:1px solid #777;border-radius:0;min-height:42px;padding:10px 16px;font-family:Arial,sans-serif;font-size:13px;box-shadow:inset 1px 1px #fff,inset -1px -1px #888}.sim-timer{padding:7px 12px;font-size:13px}.sim-content{flex:1;min-height:440px;padding:25px max(20px,15%)}.sim-stem{color:#fff;letter-spacing:0;background:#555;margin:0 0 20px;padding:15px;font-family:Arial,sans-serif;font-size:17px;line-height:1.5}.sim-answer{color:#fff;text-align:left;background:#484848;border:1px solid #a8a8a8;border-radius:0;gap:12px;width:100%;min-height:48px;margin:8px 0;padding:13px;line-height:1.5;display:flex}.sim-answer.selected{color:#101810;background:#a8da8e;border-color:#567b3e}.sim-answer b{font-weight:400}.sim-footer{background:#bdbdbd;flex-wrap:wrap;justify-content:space-between;gap:15px;padding:9px 12px;display:flex}.sim-review-grid{grid-template-columns:repeat(8,1fr);gap:8px;display:grid}.sim-review-grid button{color:#fff;background:#494949;border:1px solid #888;min-width:40px;height:43px}.sim-review-grid button.answered{color:#111;background:#a8da8e}.sim-caption{color:var(--muted);margin:0 0 12px;font-size:11px}.sim-identity{color:#fff;background:#555;padding:20px;line-height:1.9}.sim-keypad{grid-template-columns:repeat(3,1fr);gap:8px;width:240px;margin:20px auto;display:grid}.sim-keypad button{background:#a8da8e;border:1px solid #555;border-radius:0;padding:12px}.sim-languages{grid-template-columns:repeat(3,1fr);gap:9px;margin:20px 0;display:grid}.sim-languages button{color:#fff;background:#494949;border:1px solid #aaa;padding:12px}.sim-languages button.selected{color:#111;background:#a8da8e}.result-sections{grid-template-columns:repeat(3,1fr);gap:12px;display:grid}.result-section{border:1px solid var(--line);border-radius:3px;padding:18px}.result-section strong{font-size:28px;display:block}.answer-review{border-bottom:1px solid var(--line);padding:22px 0}.answer-review h3{font-size:18px;line-height:1.5}.answer-review p{font-size:14px}.status-label{font-size:12px;font-weight:700}.status-label.fail{color:#984b2b}.status-label.pass{color:#51752b}.access-grid{grid-template-columns:1.2fr 1fr;gap:25px;margin-bottom:50px;display:grid}.price-card{background:#eef2ee;border-radius:3px;padding:30px}.price-card h2{margin:12px 0 20px}.price-card ul{padding-left:20px;line-height:2.2}.recovery-code{overflow-wrap:anywhere;-webkit-user-select:all;user-select:all;background:#e9edef;padding:15px;font-family:monospace;font-size:16px;display:block}.form-stack{gap:15px;display:grid}.form-stack label input,.form-stack label select{width:100%;margin-top:5px;display:block}.admin-page{max-width:1150px;margin:40px auto;padding:20px}.admin-grid{grid-template-columns:300px 1fr;gap:25px;display:grid}.admin-post{text-align:left;border:1px solid var(--line);background:#fff;border-radius:3px;width:100%;margin:10px 0;padding:15px;display:block}.admin-form{gap:12px;display:grid}.admin-form input,.admin-form select{width:100%}.admin-form textarea{min-height:230px}.blog-grid{grid-template-columns:repeat(2,1fr);gap:20px;padding-bottom:40px;display:grid}.blog-cover{object-fit:cover;border-radius:3px;max-width:100%;height:220px}.breadcrumbs{color:var(--muted);gap:10px;padding-top:35px;font-size:12px;display:flex}.no-margin{margin:0}.divider{background:var(--line);height:1px;margin:25px 0}@media (min-width:901px){.mobile-menu{display:none}}@media (max-width:1100px){.header-inner{gap:20px;padding:16px 25px}.main-nav{gap:15px}.main-nav svg{display:none}.header-actions{gap:8px}.page{padding:0 28px}}@media (max-width:850px){.desktop-only{display:none}.main-nav{gap:19px}.article-grid{grid-template-columns:repeat(2,1fr)}.progress-grid{grid-template-columns:1fr}.metrics{grid-template-columns:repeat(2,1fr)}}@media (max-width:900px){.header-inner{gap:10px;min-height:72px;padding:12px 20px}.wordmark{font-size:21px}.brand-icon{width:43px;height:33px;font-size:18px}.header-actions{flex:0 196px;min-width:0;margin-left:auto}.header-actions select{flex:1;width:144px;min-width:0;min-height:44px;padding:6px}.mobile-menu{flex-shrink:0;display:grid}.main-nav{background:var(--paper);border-bottom:1px solid var(--line);padding:22px;display:none;position:absolute;top:100%;left:0;right:0;box-shadow:0 10px 15px #0001}.main-nav.open{grid-template-columns:1fr 1fr;gap:22px;display:grid}.main-nav svg{display:block}}@media (max-width:650px){.main-nav.open{grid-template-columns:1fr;gap:12px}.page{padding:0 21px}footer{padding:25px 21px}.footer-bottom>div{margin-top:15px}.page-heading{padding:35px 0 20px}.page-heading h1{font-size:34px}.page-heading p{font-size:14px}.article-grid{grid-template-columns:1fr}.article-header{display:block}.article-header>.article-actions{padding:0 0 24px}.prose{font-size:16px}.metrics{gap:10px}.metric{padding:15px}.metric strong{font-size:28px}.access-grid{grid-template-columns:1fr}.content-panel{padding:20px}.simulator{min-height:560px;margin:15px -8px 30px}.sim-header{font-size:12px}.sim-content{min-height:365px;padding:20px 12px}.sim-stem{font-size:16px}.sim-answer{font-size:14px}.sim-footer{gap:7px;padding:8px}.sim-footer button{flex:1;padding:9px;font-size:11px}.sim-review-grid{grid-template-columns:repeat(5,1fr)}.sim-languages{grid-template-columns:repeat(2,1fr)}.result-sections{grid-template-columns:1fr}.result-section{justify-content:space-between;align-items:center;gap:10px;display:flex}.result-section strong{font-size:23px}.blog-grid,.admin-grid{grid-template-columns:1fr}.toolbar{gap:8px}.toolbar .search{width:100%}.field-label{font-size:12px}.eyebrow{font-size:9px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}.eyebrow{letter-spacing:1px;font-size:11px;font-weight:700}.button-row{flex-wrap:wrap;align-items:center;gap:16px;display:flex}.start-page{width:100%;max-width:1060px;padding-top:52px;padding-bottom:52px}.start-heading{text-align:center;margin-bottom:32px}.start-heading h1{font-size:clamp(32px,4vw,44px)}.start-heading p{margin:12px 0 0;font-size:clamp(22px,2.7vw,28px)}.start-heading .start-codes{margin-top:8px}.start-heading.has-intro p{max-width:780px;margin:16px auto 0;font-size:19px;line-height:1.55}.start-heading.has-intro .start-codes{margin-top:8px;font-size:16px}.seo-content{overflow-wrap:anywhere;width:100%;max-width:1060px;margin:0 auto;padding:0 44px 48px;line-height:1.65}.seo-content h2{margin:0 0 12px;font-size:clamp(24px,3vw,30px);line-height:1.3}.seo-content h3{margin:0 0 8px;font-size:20px;line-height:1.4}.seo-content p{max-width:850px;margin:0 0 16px}.seo-section{border-top:1px solid var(--line);padding:28px 0}.seo-section-links{flex-wrap:wrap;gap:12px 28px;margin:20px 0 0;padding:0;list-style:none;display:flex}.seo-content a{color:#245169;text-underline-offset:3px;text-decoration:underline}.seo-content a:hover{color:#163346}.seo-section-links a{align-items:center;min-height:44px;display:inline-flex}.seo-preview{margin:24px 0}.seo-test-preview{border:1px solid var(--line);width:100%;height:auto;display:block}.seo-preview figcaption{color:var(--muted);margin-top:8px;font-size:14px}.seo-faq>div{padding-top:16px}.seo-sources{border-top:1px solid var(--line);padding-top:28px;font-size:15px}.seo-sources h2{font-size:20px}.seo-sources ul{margin:12px 0 20px;padding-left:20px}.seo-sources li+li{margin-top:8px}.seo-notice{color:var(--muted);font-size:14px}@media (max-width:1100px){.seo-content{padding-left:28px;padding-right:28px}}.start-content{border-top:1px solid var(--line);padding-top:32px}.start-content>h2{text-align:center;margin-bottom:24px;font-size:22px}.start-actions{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;display:grid}.start-actions.test-choices{grid-template-columns:repeat(2,minmax(0,1fr))}.start-action{--button-base:#282d31;color:#fff;border:1px solid var(--button-base);min-height:80px;box-shadow:0 4px 0 var(--button-base), inset 0 1px 0 #ffffff24;text-align:center;background:#45494d;border-radius:8px;justify-content:center;align-items:center;gap:12px;padding:18px;font-size:20px;font-weight:700;line-height:1.3;transition:background-color .15s,transform .1s,box-shadow .1s;display:flex}.start-action>svg{flex-shrink:0}.start-action>span{overflow-wrap:anywhere;min-width:0}.start-action-test{--button-base:#24512d;background:#397344}.start-action-walkthrough{--button-base:#233e50;background:#31556d}.start-action:hover{background:#34393d}.start-action-test:hover{background:#2e6238}.start-action-walkthrough:hover{background:#27475c}.start-action:active{box-shadow:0 1px 0 var(--button-base);transform:translateY(3px)}.footer-bottom a:hover{text-decoration:underline}@media (max-width:650px){.seo-content{padding:0 16px 32px}.seo-section{padding:24px 0}.start-heading.has-intro p{font-size:17px}.start-page{padding:24px 16px}.start-content{padding-top:24px}.start-actions,.start-actions.test-choices{grid-template-columns:minmax(0,1fr);gap:16px}.start-action{min-height:68px;padding:16px}.footer-bottom>div{gap:12px 18px}}.lesson-contents{border:1px solid var(--line);overflow-wrap:anywhere;background:#f7f8f8;padding:18px 24px}.lesson-contents h2{margin-top:0;font-size:22px}.lesson-contents a{text-underline-offset:3px;text-decoration:underline}.lesson-section{overflow-wrap:anywhere;scroll-margin-top:150px}.lesson-section+.lesson-section{border-top:1px solid var(--line);margin-top:32px}.lesson-section li{margin-bottom:10px}.controls-diagram-trigger{cursor:zoom-in;background:0 0;border:0;width:100%;padding:0;display:block}.controls-diagram-backdrop{z-index:100;background:#20252acc;place-items:center;padding:12px;display:grid;position:fixed;inset:0}.controls-diagram-dialog{background:#fff;border-radius:3px;flex-direction:column;width:min(1100px,100%);min-width:0;height:min(850px,100dvh - 24px);min-height:0;display:flex;overflow:hidden;box-shadow:0 20px 100px #0004}.controls-diagram-toolbar{border-bottom:1px solid var(--line);flex-shrink:0;justify-content:space-between;gap:12px;padding:12px;display:flex}.controls-diagram-toolbar button{border:1px solid var(--line);background:var(--paper);min-width:44px;min-height:44px;color:var(--ink);border-radius:3px;padding:6px 14px}.controls-diagram-zoom{gap:8px;display:flex}.controls-diagram-zoom button{font-size:24px;line-height:1}.controls-diagram-viewport{overscroll-behavior:contain;touch-action:pan-x pan-y pinch-zoom;flex:1;min-height:0;overflow:auto}.controls-diagram-viewport:focus-visible{outline-offset:-4px}.controls-diagram-enlarged{max-width:none;height:auto;margin:0 auto;display:block}.purchase-card{max-width:680px;margin:0 auto}.secure-purchase{text-align:center;padding:16px 0 24px}.secure-purchase img{object-fit:contain;width:auto;max-width:100%;height:80px}.analytics-consent{border:1px solid var(--line);background:var(--paper);border-radius:12px;width:min(1120px,100% - 32px);margin:20px auto 0;padding:20px}.analytics-consent h2,.analytics-settings h2{margin:0 0 8px;font-size:1.15rem}.analytics-consent p{margin:0 0 16px}.analytics-settings{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:28px 0;padding:24px 0}.analytics-actions{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.analytics-actions .button{white-space:normal;text-align:center}
