/* A quiet illustrated product world, scoped below the approved hero. */
.sp-page .sb-body{--sb-ground:#faf9fe;--sb-surface:#f2eefb;--sb-line:#e6e0ef;--sb-quiet:#625d70;background:var(--sb-ground);border-radius:44px 44px 0 0;margin-top:44px;padding-top:24px;color:#272439}
.sp-page .sb-wrap{width:min(1320px,calc(100% - 80px));margin-inline:auto}
.sp-page .sb-section{padding-block:36px;scroll-margin-top:40px}
.sp-page .sb-product-surface{display:grid;grid-template-columns:minmax(0,.94fr) minmax(0,1.06fr);gap:60px;align-items:center;padding:52px 60px 38px;border-radius:36px;background:var(--sb-surface);overflow:hidden}
.sp-page .sb-product-story{min-width:0}
.sp-page .sb-product-copy{position:relative;z-index:1;max-width:465px}
.sp-page .sb-product-copy h2,.sp-page .sb-section-heading h2,.sp-page .sb-faq h2,.sp-page .sb-closing h2{font:700 clamp(32px,2.65vw,44px)/1.2 Manrope,sans-serif;letter-spacing:-.012em;margin:0;color:#272439;text-wrap:balance}
.sp-page .sb-product-result{font-size:22px;line-height:1.5;font-weight:400;max-width:32ch;margin:20px 0 12px}
.sp-page .sb-product-description{font-size:16px;line-height:1.7;color:var(--sb-quiet);max-width:45ch;margin:0 0 24px}
.sp-page .sb-product-art{position:relative;width:min(460px,calc(100% + 24px));margin:10px 0 -30px -12px;aspect-ratio:3/2;pointer-events:none}
.sp-page .sb-product-art img{display:block;width:100%;height:100%;object-fit:contain}
.sp-page .sb-button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:13px 24px;border:1px solid transparent;border-radius:100px;font:600 15px/1.4 Manrope,sans-serif;text-decoration:none;text-align:center;transition:background-color .16s,color .16s}
.sp-page .sb-button-primary{color:#fff;background:var(--st-violet)}
.sp-page .sb-button-primary:hover{background:var(--st-deep);color:#fff}
.sp-page .sb-button-primary:active{background:#3f139d}
.sp-page .sb-inline-link{display:inline-flex;color:var(--st-violet);font-size:14px;line-height:1.5;font-weight:600;text-decoration:none;text-underline-offset:4px}
.sp-page .sb-inline-link:hover{text-decoration:underline;color:var(--st-deep)}
.sp-page .sb-body :is(a,button,input,summary):focus-visible{outline:3px solid var(--st-violet);outline-offset:4px}
.sp-page .sb-body ::selection{background:#e0d0ff;color:#272439}
.sp-page .sb-sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.sp-page .sb-nowrap{white-space:nowrap}
.sp-page .sb-replay{display:inline-flex;align-items:center;gap:7px;min-height:38px;padding:7px 0;border:0;background:transparent;color:var(--st-violet);font:600 13px/1.4 Manrope,sans-serif;text-decoration:none;white-space:nowrap;cursor:pointer}
.sp-page .sb-replay[hidden]{display:none}
.sp-page .sb-replay:hover{text-decoration:underline;text-underline-offset:4px}
.sp-page .sb-replay:disabled{color:var(--sb-quiet);cursor:default;text-decoration:none}
.sp-page .sb-replay svg{width:17px;height:17px;flex:none}

/* The miniature generator keeps the actual assembly form and order vocabulary. */
.sp-page .sb-mini-app{height:600px;min-width:0;margin:0;display:grid;border:1px solid #e5dff0;border-radius:24px;background:#fff;box-shadow:0 16px 36px rgba(54,32,94,.055);overflow:hidden;color:#272439;font:400 14px/1.5 Manrope,sans-serif;letter-spacing:0}
.sp-page .sb-mini-app :is(button,input,select,textarea){font:inherit;letter-spacing:0}
.sp-page .sb-mini-app :is(p,h3,h4,ol){margin:0}
.sp-page .sb-mini-app p{text-wrap:wrap}
.sp-page .sb-mini-app h3{font:700 16px/1.45 Manrope,sans-serif;letter-spacing:0}
.sp-page .sb-mini-app h4{font:700 14px/1.5 Manrope,sans-serif;letter-spacing:0}
.sp-page .sb-mini-app button{cursor:pointer}
.sp-page .sb-mini-app button:disabled{cursor:default}
.sp-page .sb-mini-app :is(button,a,textarea):focus-visible{outline:2px solid var(--st-violet);outline-offset:3px}
.sp-page .sb-mini-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 20px;border-bottom:1px solid #eee9f4}
.sp-page .sb-mini-brand{display:flex;align-items:center;gap:10px;min-width:0}
.sp-page .sb-mini-brand img{width:26px;height:26px;flex:none}
.sp-page .sb-mini-brand strong{font-size:16px;font-weight:700;line-height:1.4}

.sp-page .sb-mini-primary{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:8px 14px;border:0;border-radius:8px;background:var(--st-violet);color:#fff;font-size:14px;font-weight:600;line-height:1.4;text-decoration:none;text-align:center}
.sp-page .sb-mini-primary:hover{background:var(--st-deep);color:#fff}
.sp-page .sb-mini-primary:disabled{background:#eee8f7;color:#796d8b}
.sp-page .sb-mini-help{font-size:12px;line-height:1.5;color:#6b617a}
.sp-page .sb-generator-app{grid-template-rows:28px minmax(0,1fr)}
.sp-page .sb-generator-caption{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 18px 0;font-size:12px;font-weight:600;color:#625d70}
.sp-page .sb-generator-workspace{display:grid;grid-template-columns:minmax(0,1fr);min-height:0;padding:6px 16px 10px;position:relative}
.sp-page .sb-generator-panel{grid-area:1/1;min-width:0;min-height:0;display:flex;flex-direction:column;gap:14px}
.sp-page .sb-generator-panel[hidden]{display:none}
.sp-page .sb-generator-panel[aria-hidden=true]{pointer-events:none}
.sp-page .sb-assembly-steps{display:flex;align-items:center;gap:13px;list-style:none;padding:0 0 11px;border-bottom:1px solid #e8e2f0;min-height:36px;flex:none}
.sp-page .sb-assembly-steps li{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:600;line-height:1.35;color:#756c83}
.sp-page .sb-assembly-steps b{display:grid;place-items:center;flex:none;width:23px;height:23px;border:1px solid #e6dfed;border-radius:50%;font-size:13px}
.sp-page .sb-assembly-steps .is-current{color:#272439}
.sp-page .sb-assembly-steps .is-current b{color:#fff;background:var(--st-violet);border-color:var(--st-violet)}
.sp-page .sb-assembly-steps .is-done b{color:var(--st-violet);background:#f2eaff}
.sp-page .sb-assembly-form{gap:12px}
.sp-page .sb-assembly-main{min-width:0;width:100%}

.sp-page .sb-assembly-fields{display:flex;flex-direction:column;gap:8px;min-width:0;width:100%}
.sp-page .sb-assembly-fields h3,.sp-page .sb-assembly-plans>h3,.sp-page .sb-order-heading h3{font:700 18px/1.4 Unbounded,Manrope,sans-serif;letter-spacing:-.025em}
.sp-page .sb-assembly-fields h3{font-size:18px;white-space:nowrap;margin-bottom:2px}
.sp-page .sb-assembly-group{display:flex;flex-direction:column;gap:6px;min-width:0}
.sp-page .sb-assembly-group>p,.sp-page .sb-assembly-group>span{font-size:14px;line-height:1.35;font-weight:600}
.sp-page .sb-assembly-types{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:6px}
.sp-page .sb-assembly-types>span{display:flex;align-items:center;justify-content:center;height:32px;min-height:32px;padding:4px 7px;border-radius:7px;background:#f7f4fc;color:#635970;font-size:13px;line-height:1.3;text-align:center}
.sp-page .sb-assembly-types>span.is-picked{background:var(--st-violet);color:#fff}
.sp-page .sb-assembly-group>textarea{display:block;width:100%;height:50px;resize:none;overflow:hidden;min-width:0;padding:8px 9px;border:1px solid #e1d9ec;border-radius:8px;background:#fff;color:#272439;font:400 14px/1.5 Manrope,sans-serif;caret-color:var(--st-violet)}
.sp-page .sb-assembly-group>textarea::placeholder{color:#756c83}
.sp-page .sb-assembly-subjects{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}
.sp-page .sb-assembly-subjects>span{display:flex;align-items:center;justify-content:center;min-height:30px;border-radius:7px;font-size:14px;font-weight:700;line-height:1.2;color:#fff;padding:4px 3px;text-align:center}
.sp-page .sb-subject-marketing{background:#671ff6}
.sp-page .sb-subject-history{background:#c53232}
.sp-page .sb-subject-law{background:#007a85}
.sp-page .sb-subject-pedagogy{background:#bd2466}
.sp-page .sb-subject-it{background:#1464d6}
.sp-page .sb-subject-economics{background:#9741b0}
.sp-page .sb-assembly-subjects>.is-picked{outline:2px solid #37224f;outline-offset:1px}



.sp-page .sb-assembly-volume{display:flex;justify-content:space-between;align-items:center;gap:10px;font-size:14px;font-weight:600}
.sp-page .sb-assembly-volume>div{display:flex;align-items:center;border:1px solid #e7e0ef;border-radius:7px;height:36px;overflow:hidden}
.sp-page .sb-assembly-volume>div>span{display:grid;place-items:center;width:28px;height:100%;font-size:16px;font-weight:400}
.sp-page .sb-assembly-volume b{border-inline:1px solid #e7e0ef;padding:7px 12px;font-size:14px;font-variant-numeric:tabular-nums}
.sp-page .sb-assembly-submit{min-height:40px;font-size:14px;padding:10px 14px}







.sp-page .sb-assembly-plans{gap:17px}
.sp-page .sb-assembly-leaves{display:grid;grid-template-columns:1fr 1fr;gap:16px;min-height:0}
.sp-page .sb-assembly-leaf{display:flex;flex-direction:column;gap:8px;padding:0;border:0;background:none;text-align:left;color:#272439;min-width:0}
.sp-page .sb-leaf-mark{font-size:12px;font-weight:700;line-height:1.5;color:#74677f}
.sp-page .sb-assembly-leaf[aria-pressed=true] .sb-leaf-mark{color:var(--st-violet)}
.sp-page .sb-leaf-paper{display:flex;flex-direction:column;gap:11px;position:relative;flex:1;padding:20px 15px 30px;border:1px solid #e2d9ed;border-radius:3px;background:#fff;box-shadow:0 6px 15px rgba(39,36,57,.06);font:400 12px/1.55 Manrope,sans-serif}
.sp-page .sb-assembly-leaf[aria-pressed=true] .sb-leaf-paper{outline:2px solid var(--st-violet);outline-offset:-1px}
.sp-page .sb-leaf-paper>small{text-align:center;font-size:12px;color:#756681}
.sp-page .sb-leaf-paper>strong{text-align:center;font-size:14px;line-height:1.5;font-weight:700}
.sp-page .sb-leaf-paper>b{text-align:center;font-size:12px}
.sp-page .sb-leaf-paper>i{position:absolute;bottom:10px;right:12px;font-size:12px;font-style:normal;color:#74677f}
/* The order view mirrors the product: violet hero, lime path, overlapping sheet. */
.sp-page .sb-order-panel{padding:6px 0 0;gap:0}
.sp-page .sb-order-hero{flex:none;background:#671ff6;color:#fff;border-radius:21px;padding:22px 24px 48px}
.sp-page .sb-order-heading{display:grid;min-height:136px}
.sp-page .sb-order-heading>div{grid-area:1/1;min-width:0}
.sp-page .sb-order-heading h3{font:800 19px/1.18 Unbounded,Manrope,sans-serif;letter-spacing:-.025em;color:#fff;max-width:28ch}
.sp-page .sb-order-heading .sb-order-status{margin-top:9px;color:#fff;font-size:13px;font-weight:700;line-height:1.4}
.sp-page .sb-order-heading .sb-order-say{margin-top:12px;color:#fff;font-size:14px;font-weight:600;line-height:1.5;max-width:47ch}
.sp-page .sb-order-path{display:flex;gap:7px;padding:0;list-style:none;flex-wrap:wrap}
.sp-page .sb-order-path li{font-size:12px;font-weight:700;color:#fff;padding:5px 10px;border-radius:99px;line-height:1.4;background:rgba(255,255,255,.14)}
.sp-page .sb-order-path li.is-current{color:#272439;background:#bfff64}
.sp-page .sb-order-progress{display:flex;align-items:center;gap:12px;margin-top:13px}
.sp-page .sb-progress-track{height:6px;overflow:hidden;border-radius:99px;background:rgba(255,255,255,.35);position:relative}
.sp-page .sb-progress-track>span{display:block;width:100%;height:100%;background:#bfff64;border-radius:99px;transform:scaleX(1);transform-origin:left}
.sp-page .sb-order-progress .sb-progress-track{width:190px;max-width:65%}
.sp-page .sb-order-progress output{font-size:12px;font-weight:600;font-variant-numeric:tabular-nums;min-width:4ch;color:#fff}
.sp-page .sb-progress-track>i{position:absolute;inset:0 auto 0 0;width:36%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.85),transparent);transform:translateX(-130%);pointer-events:none}
.sp-page .sb-order-stack{position:relative;z-index:1;margin:-30px 11px 0;padding:16px 19px 17px;background:#fff;border-radius:18px;box-shadow:0 12px 26px rgba(39,36,57,.12)}
.sp-page .sb-order-caption{color:#514868;font-size:12px;font-weight:700;line-height:1.4}
.sp-page .sb-order-sheet{background:#fff;padding-top:15px;min-width:0}
.sp-page .sb-sheet-head{display:flex;justify-content:space-between;gap:14px;color:#70657e;font-size:12px;line-height:1.5;margin-bottom:11px}
.sp-page .sb-order-sheet h4{font:700 16px/1.45 Manrope,sans-serif;letter-spacing:0;max-width:34ch;margin-bottom:15px}
.sp-page .sb-sheet-body{display:grid;min-height:122px}
.sp-page .sb-sheet-body>div{grid-area:1/1;min-width:0}
.sp-page .sb-sheet-paragraphs p{font:400 14px/1.6 Manrope,sans-serif;color:#272439;margin-bottom:10px}
.sp-page .sb-sheet-paragraphs p:last-child{margin-bottom:0}
.sp-page .sb-sheet-blank{padding-top:3px}
.sp-page .sb-sheet-blank strong{display:block;font-size:14px;font-weight:700;line-height:1.5;margin-bottom:7px}
.sp-page .sb-sheet-blank p{font-size:13px;line-height:1.5;color:#62576f;max-width:35ch}
.sp-page .sb-work-meta{font-size:12px;line-height:1.5;color:#6b617a}
/* The completed order keeps the same purple hero and overlapping first-page sheet. */
.sp-page .sb-word-ready{padding:6px 0 0;gap:0;justify-content:flex-start}
.sp-page .sb-order-done{padding:22px 24px 49px}
.sp-page .sb-order-done h3{font:800 19px/1.18 Unbounded,Manrope,sans-serif;letter-spacing:-.025em;color:#fff}
.sp-page .sb-done-rule{display:block;width:44px;height:3px;margin-top:10px;border-radius:99px;background:#bfff64;transform-origin:left}
.sp-page .sb-order-done .sb-done-lead{margin-top:11px;color:#fff;font-size:14px;font-weight:700;line-height:1.45;max-width:48ch}
.sp-page .sb-order-done .sb-done-description{margin-top:9px;color:#fff;font-size:13px;font-weight:400;line-height:1.5;max-width:53ch}
.sp-page .sb-done-stack{padding:20px 20px 19px}
.sp-page .sb-done-stack .sb-order-sheet{padding-top:0}
.sp-page .sb-order-download-bar{padding-top:17px}
.sp-page .sb-order-download{display:inline-flex;align-items:center;justify-content:center;min-width:176px;min-height:42px;padding:10px 20px;border-radius:11px;background:#bfff64;color:#272439;font:700 14px/1.4 Manrope,sans-serif;text-decoration:none;text-align:center}
.sp-page .sb-order-download:hover{background:#b4f04a;color:#272439}
.sp-page .sb-mini-app .sb-order-note{margin-top:10px;color:#514868;font-size:12px;line-height:1.5}
.sp-page .sb-mini-app .sb-order-again{margin-top:10px;font-size:12px;line-height:1.5}
.sp-page .sb-order-again a{font-weight:700;color:#5e20d8;text-decoration:none;text-underline-offset:3px}
.sp-page .sb-order-again a:hover{text-decoration:underline}

/* Compact conversations: only arrived messages occupy the history. */
.sp-page .sb-solver-app,.sp-page .sb-conversation-app{height:560px;grid-template-rows:56px minmax(0,1fr) 84px}
.sp-page .sb-thread-status{font-size:12px;font-weight:400;line-height:1.4;color:#74677f;white-space:nowrap}
.sp-page .sb-chat-history{min-height:0;overflow:auto;overflow-anchor:none;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#cbb9e5 #fff;padding:17px 20px;list-style:none;display:flex;flex-direction:column;gap:16px}
.sp-page .sb-chat-history [hidden]{display:none!important}
.sp-page .sb-chat-message{position:relative;min-width:0;max-width:92%;font:400 14px/1.55 Manrope,sans-serif;flex:none}
.sp-page .sb-chat-message p{font-size:14px;line-height:1.55}
.sp-page .sb-chat-message-user{align-self:flex-end;padding:10px 13px;background:#f1eafb;color:#3d3055;border-radius:13px 13px 4px 13px}
.sp-page .sb-chat-message-ai{align-self:flex-start;width:100%;max-width:100%;padding:0;background:#fff;color:#272439}
.sp-page .sb-message-author{display:flex;align-items:center;gap:8px;margin-bottom:7px;min-height:20px}
.sp-page .sb-message-author img{width:20px;height:20px;flex:none}
.sp-page .sb-message-author strong{font-size:13px;font-weight:700;color:var(--st-violet);line-height:1.5}
.sp-page .sb-chat-message-ai>:not(.sb-message-author){margin-left:28px}
.sp-page .sb-answer-text>p+p,.sp-page .sb-answer-text>div+p{margin-top:8px}
.sp-page .sb-answer-text strong{font-weight:700}
.sp-page .sb-answer-text .sb-chat-formula{font-size:16px;font-weight:700;line-height:1.5;font-variant-numeric:tabular-nums;letter-spacing:0}
.sp-page .sb-answer-text .sb-inline-link{font-size:13px;margin-top:10px}
.sp-page .sb-formula-example{padding:10px 12px;margin-block:10px;border-radius:9px;background:#f7f3fe}
.sp-page .sb-formula-example>span{display:block;font-size:12px;line-height:1.4;color:#6b617a;margin-bottom:4px}
.sp-page .sb-answer-text mark{border-radius:4px;padding:0 2px;background:#eee4ff;color:#4c2091}
.sp-page .sb-thread-typing{display:flex;align-items:center;gap:5px;min-height:25px;padding-bottom:2px}
.sp-page .sb-thread-typing i{display:block;width:5px;height:5px;border-radius:50%;background:#9775c1}
.sp-page .sb-thread-typing>span{font-size:12px;line-height:1.5;color:#79648f;margin-left:7px}
.sp-page .sb-message-actions{display:flex;align-items:center;gap:5px 10px;flex-wrap:wrap;margin-top:9px}
.sp-page .sb-message-actions button{display:inline-flex;align-items:center;justify-content:center;gap:5px;min-height:30px;padding:5px 7px;border:0;border-radius:6px;background:transparent;color:#6b617a;font:600 12px/1.4 Manrope,sans-serif;text-align:left}
.sp-page .sb-message-actions button[data-copy-answer]{min-width:108px;justify-content:flex-start}
.sp-page .sb-message-actions button[data-explain-more]{color:#6333aa}
.sp-page .sb-message-actions button:hover{background:#f4eefc;color:var(--st-violet)}
.sp-page .sb-message-actions button:disabled{color:#8d8398;background:transparent}
.sp-page .sb-message-actions svg{width:15px;height:15px;stroke:currentColor;stroke-width:1.4;flex:none}
.sp-page .sb-solver-user{width:fit-content;min-width:268px}
.sp-page .sb-solver-user>p{margin-top:8px}
.sp-page .sb-task-attachment{display:flex;align-items:center;gap:11px;min-height:50px}
.sp-page .sb-task-thumbnail{width:62px;height:50px;flex:none}
.sp-page .sb-task-thumbnail text{font:600 12px Manrope,sans-serif;fill:#514069}
.sp-page .sb-task-attachment strong{display:block;font-size:13px;font-weight:700;line-height:1.5}
.sp-page .sb-task-attachment span{display:block;font-size:12px;line-height:1.5;color:#74677f;margin-top:3px}
.sp-page .sb-attachment-check{width:18px;height:18px;margin-left:8px;stroke:var(--st-violet);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.sp-page .sb-recognized-equation{font-weight:700}
.sp-page .sb-recognized-equation>span{font-size:13px;font-weight:400;color:#6b617a}
.sp-page .sb-solution-steps{list-style:none;padding:0;display:grid;gap:2px;margin-top:8px!important}
.sp-page .sb-solution-steps>li{display:flex;align-items:flex-start;gap:9px;min-height:42px;padding:3px 5px 3px 0;border-radius:7px}
.sp-page .sb-solution-steps>li>span{display:grid;place-items:center;width:21px;height:21px;margin-top:2px;border-radius:50%;background:#f0e9fa;color:#705194;font-size:12px;font-weight:600;flex:none}
.sp-page .sb-solution-steps p{font-size:12px;line-height:1.45;color:#6b617a;margin-bottom:2px}
.sp-page .sb-solution-steps strong{font-size:15px;line-height:1.5;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:0}
.sp-page .sb-solution-steps mark{background:transparent;color:inherit;padding:0}
.sp-page .sb-solution-steps>li.is-explained{background:#f5efff}
.sp-page .sb-solution-steps>li.is-explained mark{background:#e7d8ff;color:#4c2091}
.sp-page .sb-solution-check{display:flex;align-items:center;gap:9px;margin-top:8px}
.sp-page .sb-solution-check>svg{width:21px;height:21px;fill:none;stroke:var(--st-violet);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex:none}
.sp-page .sb-solution-check strong{display:block;font-size:13px;font-weight:700;line-height:1.5}
.sp-page .sb-solution-check p>span{display:block;font-size:12px;line-height:1.5;color:#6b617a}
.sp-page .sb-chat-composer{position:relative;min-width:0;padding:11px 16px 13px;border-top:1px solid #eee9f4;background:#fff}
.sp-page .sb-composer-row{display:flex;gap:8px;align-items:center;min-width:0;padding:8px;border:1px solid #ded5ec;border-radius:13px;background:#fff}
.sp-page .sb-composer-row>textarea{display:block;width:100%;min-width:0;height:40px;resize:none;overflow:hidden;padding:0;border:0;background:#fff;color:#272439;font:400 14px/1.4 Manrope,sans-serif;caret-color:var(--st-violet)}
.sp-page .sb-composer-row>textarea::placeholder{color:#756c83}
.sp-page .sb-chat-send,.sp-page .sb-chat-attach{display:grid;place-items:center;flex:none;width:34px;height:34px;padding:7px;border:0;border-radius:9px;text-decoration:none}
.sp-page .sb-chat-send{background:var(--st-violet);color:#fff}
.sp-page .sb-chat-send:disabled{background:#eee8f7;color:#877295}
.sp-page .sb-chat-attach{background:#f7f3fc;color:#70558d}
.sp-page .sb-chat-attach:hover{background:#eee5fb;color:var(--st-violet)}
.sp-page .sb-chat-send svg,.sp-page .sb-chat-attach svg{width:20px;height:20px;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.sp-page .sb-composer-feedback{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
@media(max-width:599px){.sp-page .sb-thread-status{display:none}.sp-page .sb-solver-user{min-width:0}.sp-page .sb-chat-message-ai>:not(.sb-message-author){margin-left:0}.sp-page .sb-chat-composer{padding-inline:12px}.sp-page .sb-chat-attach{width:29px;padding:5px}.sp-page .sb-message-actions{gap:4px}.sp-page .sb-message-actions button{font-size:12px;padding-inline:5px}}

@media(max-width:1099px){.sp-page .sb-generator-workspace{padding-inline:13px}.sp-page .sb-assembly-fields h3{font-size:15px}.sp-page .sb-mini-header{padding-inline:16px}.sp-page .sb-mini-brand strong{font-size:14px}.sp-page .sb-chat-history{padding-inline:18px}}
@media(max-width:599px){.sp-page .sb-mini-app{border-radius:19px}.sp-page .sb-assembly-fields h3{font-size:17px}.sp-page .sb-assembly-fields{gap:9px}.sp-page .sb-assembly-steps{gap:10px}.sp-page .sb-assembly-steps li{font-size:12px}.sp-page .sb-assembly-leaves{gap:10px}.sp-page .sb-leaf-paper{padding:14px 10px 26px;gap:9px}.sp-page .sb-leaf-paper>strong{font-size:12px}.sp-page .sb-mini-header{padding-inline:12px;gap:7px}.sp-page .sb-mini-brand{gap:6px}.sp-page .sb-mini-brand strong{font-size:13px}.sp-page .sb-mini-brand img{width:22px;height:22px}.sp-page .sb-mini-progress,.sp-page .sb-solver-condition,.sp-page .sb-solution-workspace{padding-inline:16px}.sp-page .sb-chat-history,.sp-page .sb-chat-composer{padding-inline:14px}}

/* The mathematical proof continues the chat and keeps its original coordinate system. */
.sp-page .sb-explain{padding-block:56px 40px}
.sp-page .sb-section-heading{display:grid;grid-template-columns:1.15fr 1fr;align-items:end;gap:72px;margin-bottom:32px;padding-inline:28px}
.sp-page .sb-section-heading h2{font-size:38px}
.sp-page .sb-section-heading p{font-size:17px;line-height:1.7;max-width:48ch;margin:0;color:var(--sb-quiet)}
.sp-page .sb-lesson>figcaption{display:flex;justify-content:space-between;align-items:center;gap:24px;font-size:13px;line-height:1.5}
/* The plotted geometry, tangent and numerical answer share one time value. */
.sp-page .sb-lesson{margin:0;border-block:1px solid var(--st-line);padding:24px 0 35px}
.sp-page .sb-lesson>figcaption{color:var(--st-ink);font-weight:650}
.sp-page .sb-lesson-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,.9fr);gap:76px;align-items:center;margin-top:28px}
.sp-page .sb-graph-side{min-width:0}
.sp-page .sb-graph-legend{display:flex;align-items:center;gap:24px;font-size:12px;line-height:1.5;color:var(--st-quiet);margin:0 0 4px 28px;flex-wrap:wrap}
.sp-page .sb-graph-legend>span{display:flex;align-items:center;gap:8px}
.sp-page .sb-graph-legend i{display:block;width:19px;height:2px;flex:none}
.sp-page .sb-legend-curve{background:var(--st-violet)}
.sp-page .sb-legend-tangent{background:var(--st-ink)}
.sp-page .sb-plot{display:block;width:100%;height:auto;overflow:visible}
.sp-page .sb-plot-grid{fill:none;stroke:var(--st-line);stroke-width:1}
.sp-page .sb-plot-axes{fill:none;stroke:var(--st-quiet);stroke-width:1.2}
.sp-page .sb-plot-labels{fill:var(--st-quiet);font-family:Manrope,sans-serif;font-size:13px;font-variant-numeric:tabular-nums}
.sp-page .sb-plot-guide{fill:none;stroke:var(--st-quiet);stroke-opacity:.45;stroke-width:1;stroke-dasharray:4 5}
.sp-page .sb-plot-curve{fill:none;stroke:var(--st-violet);stroke-width:3.5;stroke-linecap:round}
.sp-page .sb-plot-tangent{fill:none;stroke:var(--st-ink);stroke-width:1.8;stroke-linecap:round}
.sp-page .sb-plot-point{fill:var(--st-lemon);stroke:var(--st-violet);stroke-width:2.5}
.sp-page .sb-time-control{display:grid;grid-template-columns:1fr auto;gap:14px 20px;padding:13px 30px 0 28px}
.sp-page .sb-time-control label{font-size:13px;line-height:1.5;color:var(--st-ink);font-weight:600}
.sp-page .sb-time-control output{font-size:13px;line-height:1.5;color:var(--st-violet);font-weight:700;font-variant-numeric:tabular-nums}
.sp-page .sb-time-control input{appearance:none;-webkit-appearance:none;width:100%;height:18px;grid-column:1/-1;margin:0;cursor:pointer;background:transparent;accent-color:var(--st-violet);border:0}
.sp-page .sb-time-control input::-webkit-slider-runnable-track{height:4px;background:var(--st-line);border-radius:4px}
.sp-page .sb-time-control input::-moz-range-track{height:4px;background:var(--st-line);border-radius:4px}
.sp-page .sb-time-control input::-webkit-slider-thumb{appearance:none;-webkit-appearance:none;width:18px;height:18px;border:3px solid var(--st-paper);border-radius:50%;background:var(--st-violet);box-shadow:0 0 0 1px var(--st-violet);margin-top:-7px}
.sp-page .sb-time-control input::-moz-range-thumb{width:12px;height:12px;border:3px solid var(--st-paper);border-radius:50%;background:var(--st-violet);box-shadow:0 0 0 1px var(--st-violet)}
.sp-page .sb-time-control input:disabled{cursor:default}
.sp-page .sb-range-ends{grid-column:1/-1;display:flex;justify-content:space-between;font-size:12px;line-height:1.4;color:var(--st-quiet);margin-top:-9px}
.sp-page .sb-lesson-story h3{font-family:Manrope,sans-serif;font-size:26px;font-weight:650;letter-spacing:-.025em;line-height:1.4;margin:0 0 17px;color:var(--st-ink)}
.sp-page .sb-lesson-story>p{font-size:15px;line-height:1.7;color:var(--st-quiet);margin:0;max-width:44ch}
.sp-page .sb-speed-result{margin:27px 0 23px;padding:21px 0;border-block:1px solid var(--st-line)}
.sp-page .sb-speed-result>span{font-size:13px;line-height:1.5;color:var(--st-quiet)}
.sp-page .sb-speed-result strong{display:flex;align-items:baseline;gap:10px;font-family:Unbounded,Manrope,sans-serif;font-size:54px;font-weight:800;letter-spacing:-.035em;line-height:1.3;color:var(--st-violet);font-variant-numeric:tabular-nums;margin:4px 0}
.sp-page .sb-speed-unit{font-family:Manrope,sans-serif;font-size:21px;font-weight:500;letter-spacing:0;color:var(--st-quiet)}
.sp-page .sb-speed-result>p{font-size:15px;font-variant-numeric:tabular-nums;line-height:1.5;margin:7px 0 0;color:var(--st-ink)}
.sp-page .sb-lesson-story .sb-lesson-note{font-size:13px;margin-bottom:20px}


.sp-page .sb-lesson{background:#fff;border:0;border-radius:32px;padding:28px 36px 32px;box-shadow:0 12px 28px rgba(54,32,94,.035)}
.sp-page .sb-lesson-grid{gap:64px}
.sp-page .sb-lesson-story h3{font-weight:600;font-size:27px}
.sp-page .sb-speed-result{border-color:var(--sb-line)}
.sp-page .sb-speed-result strong{font:600 62px/1.2 Manrope,sans-serif;letter-spacing:-.035em}
.sp-page .sb-plot-point{fill:#dcccff}
.sp-page .sb-time-control input::-webkit-slider-thumb{box-shadow:0 0 0 1px var(--st-violet)}
.sp-page .sb-directory{margin:12px 24px 0;border-bottom:1px solid var(--sb-line)}
.sp-page .sb-directory>summary{display:flex;align-items:center;gap:24px;min-height:58px;padding:12px 4px;list-style:none;cursor:pointer;font-size:14px;line-height:1.5;font-weight:500;color:var(--sb-quiet)}
.sp-page .sb-directory>summary::-webkit-details-marker{display:none}
.sp-page .sb-directory>summary:hover{color:var(--st-violet)}
.sp-page .sb-directory-note{margin-left:auto;font-size:12px;font-weight:400}
.sp-page .sb-disclosure-mark{position:relative;display:block;width:18px;height:18px;flex:none}
.sp-page .sb-disclosure-mark::before,.sp-page .sb-disclosure-mark::after{content:"";position:absolute;left:2px;right:2px;top:8px;height:1.5px;background:currentColor}
.sp-page .sb-disclosure-mark::after{transform:rotate(90deg)}
.sp-page .sb-directory[open]>summary .sb-disclosure-mark::after{transform:none}
.sp-page .sb-directory-content{padding:8px 4px 24px}
.sp-page .sb-directory :is(.format-links,.topic-links){display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0 24px;padding:0;margin:0}
.sp-page .sb-directory :is(.format-links,.topic-links) a,.sp-page .sb-subject-index .subject-group nav a{display:flex;align-items:center;min-height:50px;padding:10px 0;border:0;border-bottom:1px solid var(--sb-line);border-radius:0;background:none;color:#272439;font-size:13px;font-weight:500;line-height:1.55;text-decoration:none}
.sp-page .sb-directory :is(.format-links,.topic-links) a:hover,.sp-page .sb-subject-index .subject-group nav a:hover{color:var(--st-violet);text-decoration:underline;text-underline-offset:4px}
.sp-page .sb-subject-index .subject-groups{display:grid;grid-template-columns:1fr 1fr;gap:48px;margin:0}
.sp-page .sb-subject-index .subject-group{border:0;padding:0;background:transparent}
.sp-page .sb-subject-index .subject-group h3{font:600 14px/1.5 Manrope,sans-serif;letter-spacing:0;color:var(--st-violet);margin:0 0 8px;padding:0;border:0}
.sp-page .sb-subject-index .subject-group nav{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}
.sp-page .sb-subject-index .more{margin-top:16px;border:0;padding:0}
.sp-page .sb-subject-index .more summary{display:list-item;cursor:pointer;font-size:13px;font-weight:500;line-height:1.5;color:var(--st-violet);padding:4px 0;list-style-position:inside}
.sp-page .sb-subject-index .more summary::after{content:none}
.sp-page .sb-subject-index .more[open]>nav{margin-top:7px}
.sp-page .sb-topics-index .topic-links{grid-template-columns:repeat(3,minmax(0,1fr))}

/* A short decision aid and three equally available closing actions. */
.sp-page .sb-faq{display:grid;grid-template-columns:.94fr 1.06fr;gap:60px;padding:68px 28px 58px}
.sp-page .sb-faq h2{font-size:36px}
.sp-page .sb-faq-intro>p{font-size:17px;line-height:1.7;color:var(--sb-quiet);margin:18px 0 0;max-width:30ch}
.sp-page .sb-faq-list{display:grid;gap:10px}
.sp-page .sb-faq-list details{border:0;border-radius:20px;background:#fff;padding-inline:24px}
.sp-page .sb-faq-list summary{display:flex;align-items:center;justify-content:space-between;gap:20px;list-style:none;padding:21px 0;cursor:pointer;font-size:16px;font-weight:500;line-height:1.5}
.sp-page .sb-faq-list summary::-webkit-details-marker{display:none}
.sp-page .sb-faq-list summary>span{position:relative;width:18px;height:18px;flex:none;color:#88779e}
.sp-page .sb-faq-list summary>span::before,.sp-page .sb-faq-list summary>span::after{content:"";position:absolute;top:8px;left:2px;right:2px;height:1.5px;background:currentColor}
.sp-page .sb-faq-list summary>span::after{transform:rotate(90deg)}
.sp-page .sb-faq-list details[open] summary>span::after{transform:none}
.sp-page .sb-faq-answer{padding:0 16px 24px 0}
.sp-page .sb-faq-answer p{font-size:14px;line-height:1.85;color:var(--sb-quiet);margin:0}
.sp-page .sb-faq-answer strong{font-weight:600;color:#272439}
.sp-page .sb-closing{padding:44px 28px 80px}
.sp-page .sb-closing-heading{text-align:center;margin-bottom:32px}
.sp-page .sb-closing h2{font-size:38px}
.sp-page .sb-closing-heading>p{font-size:17px;line-height:1.6;color:var(--sb-quiet);margin:16px 0 0}
.sp-page .sb-start-routes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.sp-page .sb-start-routes>a{display:flex;flex-direction:column;gap:8px;padding:27px 28px;background:#fff;color:#272439;border-radius:22px;text-decoration:none;transition:background-color .16s}
.sp-page .sb-start-routes>a:hover{background:#ece4fb}
.sp-page .sb-start-routes strong{font-size:20px;line-height:1.4;font-weight:600;color:var(--st-violet)}
.sp-page .sb-start-routes span{font-size:14px;line-height:1.5;color:var(--sb-quiet)}

/* Desktop proportions first; narrow layouts retain a simple, usable stack. */
@media(max-width:1399px){
.sp-page .sb-product-surface{padding:42px 44px 30px;gap:40px;grid-template-columns:minmax(0,.94fr) minmax(0,1.06fr)}
.sp-page .sb-product-copy h2{font-size:36px}
.sp-page .sb-product-result{font-size:20px;margin-top:18px}
.sp-page .sb-product-description{font-size:15px;line-height:1.7}
.sp-page .sb-product-art{width:min(430px,calc(100% + 24px));margin-top:12px}
.sp-page .sb-scene-stage{padding-inline:26px}
.sp-page .sb-document-demo{padding-inline:8px}
.sp-page .sb-document-sheet h3{font-size:21px}
.sp-page .sb-chat-answer{font-size:24px}
.sp-page .sb-lesson-grid{gap:44px}
.sp-page .sb-faq{gap:44px}
}
@media(max-width:1099px){
.sp-page .sb-wrap{width:calc(100% - 56px)}
.sp-page .sb-product-surface{padding:36px 32px 30px;gap:28px}
.sp-page .sb-product-copy h2{font-size:32px}
.sp-page .sb-product-result{font-size:19px}
.sp-page .sb-scene-stage{padding:24px 20px;height:400px}
.sp-page .sb-plan-options{grid-template-columns:1fr;gap:10px}
.sp-page .sb-plan-options>button{padding:13px 15px;gap:7px}
.sp-page .sb-topic-field h3{font-size:24px}
.sp-page .sb-chat-answer{font-size:21px}
.sp-page .sb-context-formulas{gap:10px;grid-template-columns:1fr 30px 1fr}
.sp-page .sb-context-formulas strong{font-size:23px}
.sp-page .sb-context-formulas svg{width:30px}
.sp-page .sb-section-heading{padding-inline:12px;gap:36px}
.sp-page .sb-section-heading h2{font-size:33px}
.sp-page .sb-lesson-grid{gap:28px}
.sp-page .sb-faq{padding-inline:12px;gap:32px}
}
@media(max-width:899px){
.sp-page .sb-product-surface{grid-template-columns:1fr;padding:32px;gap:24px}
.sp-page .sb-product-story{display:grid;grid-template-columns:1.1fr .9fr;gap:20px;align-items:center}
.sp-page .sb-product-art{width:100%;margin:0}
.sp-page .sb-product-copy h2{font-size:30px}
.sp-page .sb-scene{width:100%;max-width:620px;justify-self:center}
.sp-page .sb-scene-stage{height:390px}
.sp-page .sb-section-heading{grid-template-columns:1fr;gap:20px}
.sp-page .sb-lesson-grid{grid-template-columns:1fr;gap:30px}
.sp-page .sb-lesson-story{max-width:500px}
.sp-page .sb-faq{grid-template-columns:1fr;gap:26px}
.sp-page .sb-start-routes{grid-template-columns:1fr}
}
@media(max-width:599px){
.sp-page .sb-body{margin-top:28px;border-radius:28px 28px 0 0;padding-top:8px}
.sp-page .sb-wrap{width:calc(100% - 32px)}
.sp-page .sb-section{padding-block:24px}
.sp-page .sb-product-surface{padding:26px 18px 24px;border-radius:26px;gap:22px}
.sp-page .sb-product-story{display:block}
.sp-page .sb-product-copy h2{font-size:29px}
.sp-page .sb-product-result{font-size:19px;margin-top:16px}
.sp-page .sb-product-description{font-size:14px}
.sp-page .sb-product-copy .sb-button{width:100%}
.sp-page .sb-product-art{width:80%;margin:12px auto -12px}
.sp-page .sb-scene-bar{font-size:12px;gap:12px;padding-inline:2px}
.sp-page .sb-replay{font-size:12px}
.sp-page .sb-scene-stage{height:440px;padding:22px 18px;border-radius:20px}
.sp-page .sb-step-controls{gap:2px;padding:4px;border-radius:18px}
.sp-page .sb-step-controls>button{flex-direction:column;gap:4px;font-size:12px;min-height:58px;border-radius:14px;padding:8px 3px}
.sp-page .sb-step-controls>button>span{font-size:12px}
.sp-page .sb-document-demo{padding:0}
.sp-page .sb-document-sheet{padding:0}
.sp-page .sb-document-sheet h3{font-size:20px}
.sp-page .sb-document-sheet>p{font-size:14px}
.sp-page .sb-topic-field h3{font-size:23px}
.sp-page .sb-topic-requirements p{font-size:14px}
.sp-page .sb-plan-demo h3{font-size:21px}
.sp-page .sb-plan-options>button{font-size:12px}
.sp-page .sb-equation-large{font-size:25px}
.sp-page .sb-calculation strong{font-size:25px}
.sp-page .sb-equation-answer>strong{font-size:49px}
.sp-page .sb-chat-bubble{padding:14px;font-size:14px;max-width:100%}
.sp-page .sb-chat-ai{padding-left:0}
.sp-page .sb-chat-answer{font-size:21px}
.sp-page .sb-context-formulas{grid-template-columns:1fr 24px 1fr;gap:6px;margin-inline:0}
.sp-page .sb-context-formulas strong{font-size:21px}
.sp-page .sb-context-formulas svg{width:24px}
.sp-page .sb-scene-note{font-size:12px;margin-inline:2px}
.sp-page .sb-directory{margin-inline:10px}
.sp-page .sb-directory>summary{font-size:13px;gap:12px}
.sp-page .sb-directory-note{display:none}
.sp-page .sb-disclosure-mark{margin-left:auto}
.sp-page .sb-directory :is(.format-links,.topic-links){grid-template-columns:1fr 1fr;gap:0 18px}
.sp-page .sb-subject-index .subject-groups{grid-template-columns:1fr;gap:24px}
.sp-page .sb-subject-index .subject-group nav{gap:0 18px}
.sp-page .sb-section-heading{padding:0 8px;margin-bottom:24px}
.sp-page .sb-section-heading h2{font-size:29px}
.sp-page .sb-section-heading p{font-size:15px}
.sp-page .sb-lesson{padding:20px 16px 26px;border-radius:24px}
.sp-page .sb-lesson>figcaption{flex-direction:column;align-items:flex-start;gap:4px;font-size:12px}
.sp-page .sb-graph-legend{margin-left:0;gap:14px;font-size:12px}
.sp-page .sb-plot-labels{font-size:26px}
.sp-page .sb-time-control{padding-inline:0;gap:12px 10px}
.sp-page .sb-time-control label,.sp-page .sb-time-control output{font-size:12px}
.sp-page .sb-lesson-story h3{font-size:23px}
.sp-page .sb-lesson-story>p{font-size:14px}
.sp-page .sb-faq{padding-inline:8px;gap:22px}
.sp-page .sb-faq h2{font-size:29px}
.sp-page .sb-faq-intro>p{font-size:15px}
.sp-page .sb-faq-list details{padding-inline:18px}
.sp-page .sb-faq-list summary{font-size:15px}
.sp-page .sb-faq-answer p{font-size:13px}
.sp-page .sb-closing{padding:36px 8px 52px}
.sp-page .sb-closing h2{font-size:30px}
.sp-page .sb-closing-heading>p{font-size:15px}
.sp-page .sb-start-routes>a{padding:22px}
}
@media(prefers-reduced-motion:reduce){.studio-shell:not(.motion-enabled) .sb-body *{animation:none!important;transition:none!important}}


/* The plotted point is the control; its transparent stroke keeps a generous hit area. */
.sp-page .sb-plot-point{pointer-events:none}
.sp-page .sb-plot-drag{fill:transparent;stroke:transparent;stroke-width:28px;vector-effect:non-scaling-stroke;pointer-events:all;cursor:grab;touch-action:none;outline:none}
.sp-page .sb-plot-drag.is-dragging{cursor:grabbing}
.sp-page .sb-point-focus{fill:none;stroke:var(--st-violet);stroke-width:1.5;stroke-opacity:.5;opacity:0;pointer-events:none;vector-effect:non-scaling-stroke}
.sp-page .sb-plot:has(.sb-plot-drag:focus-visible) .sb-point-focus,.sp-page .sb-plot:has(.sb-plot-drag.is-dragging) .sb-point-focus{opacity:1}
.sp-page .sb-point-help{font:400 12px/1.6 Manrope,sans-serif;color:var(--sb-quiet);margin:12px 0 0 28px;max-width:50ch}