.school{--school-bg:var(--lightningcss-light,#f8f9f5)var(--lightningcss-dark,var(--night-page));--school-paper:var(--lightningcss-light,#fffefa)var(--lightningcss-dark,var(--night-surface));--school-ink:var(--lightningcss-light,#29382d)var(--lightningcss-dark,var(--night-ink));--school-muted:var(--lightningcss-light,#626f5c)var(--lightningcss-dark,var(--night-muted));--school-line:var(--lightningcss-light,#e5e8df)var(--lightningcss-dark,var(--night-border));--school-green:var(--lightningcss-light,#3d654d)var(--lightningcss-dark,var(--night-accent));--school-green-dark:var(--lightningcss-light,#2d513d)var(--lightningcss-dark,var(--night-accent));--school-soft:var(--lightningcss-light,#eef2e8)var(--lightningcss-dark,var(--night-raised));--school-mint:var(--lightningcss-light,#e1eadb)var(--lightningcss-dark,var(--night-raised));color:var(--school-ink);background:var(--school-bg);letter-spacing:.005em;color-scheme:normal;min-height:100vh;font-family:Inter,PingFang SC,Microsoft YaHei,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:14px;line-height:1.6}.school *{box-sizing:border-box}.school button,.school input,.school textarea{font:inherit}.school button,.school a{-webkit-tap-highlight-color:transparent}.school button{cursor:pointer}.school button:disabled{cursor:not-allowed}.school a{color:inherit;text-decoration:none}.school button,.school a,.school input,.school textarea{outline-offset:4px}.school :focus-visible{outline:2px solid var(--lightningcss-light,#4c7756)var(--lightningcss-dark,var(--night-accent))}.school h1,.school h2,.school h3,.school p{margin:0}.school button{transition:background .18s,color .18s,border-color .18s,box-shadow .18s,transform .18s}.school button:not(:disabled):active{transform:translateY(1px)}.school svg{flex-shrink:0}.school ::selection{background:var(--lightningcss-light,#dce8cd)var(--lightningcss-dark,var(--night-raised));color:var(--lightningcss-light,#2b4733)var(--lightningcss-dark,var(--night-ink))}.school pre{white-space:pre-wrap;overflow-wrap:anywhere;font-family:inherit}.school-skip{z-index:100;background:var(--lightningcss-light,white)var(--lightningcss-dark,var(--night-surface));border:1px solid var(--school-green);border-radius:8px;padding:10px 20px;position:fixed;top:-80px;left:15px}.school-skip:focus{top:12px}.school-header{background:var(--lightningcss-light,#fffefaf7)var(--lightningcss-dark,color-mix(in srgb, var(--night-surface) 97.0%, transparent));border-bottom:1px solid var(--school-line);z-index:30;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);justify-content:space-between;align-items:center;gap:24px;height:76px;padding:0 32px;display:flex;position:sticky;top:0}.school-logo{flex-shrink:0;align-items:center;gap:9px;display:flex;color:var(--school-green)!important}.school-logo>span:nth-child(2){letter-spacing:-1.7px;color:var(--lightningcss-light,#263c2b)var(--lightningcss-dark,var(--night-ink));font-size:29px;font-weight:760;line-height:1}.school-logo .logo-dot{color:var(--lightningcss-light,#85a080)var(--lightningcss-dark,var(--night-accent))}.brand-caption{color:var(--lightningcss-light,#7b8575)var(--lightningcss-dark,var(--night-accent));letter-spacing:.04em;border-left:1px solid var(--lightningcss-light,#dfe4d8)var(--lightningcss-dark,var(--night-border));max-width:130px;margin-left:11px;padding-left:15px;font-size:11px;line-height:1.5}.school-topnav{gap:29px;height:100%;margin-left:auto;margin-right:auto;display:flex}.topnav-item{color:var(--lightningcss-light,#858b81)var(--lightningcss-dark,var(--night-muted));white-space:nowrap;background:0 0;border:0;border-bottom:2px solid #0000;align-items:center;gap:8px;padding:3px 0 0;display:flex;font-size:13px!important}.topnav-item.is-active{color:var(--school-green);border-bottom-color:var(--school-green);font-weight:600}.topnav-item:hover{color:var(--school-green)}.pocket-count{background:var(--lightningcss-light,#e9eee2)var(--lightningcss-dark,var(--night-raised));border-radius:3px;padding:0 5px;font-size:10px}.header-actions{align-items:center;gap:19px;font-size:12px;display:flex}.language-switch{white-space:nowrap;align-items:center;gap:7px;display:flex;color:var(--lightningcss-light,#737d6f)var(--lightningcss-dark,var(--night-accent))!important}.language-switch:hover{color:var(--school-green)!important}.header-separator{background:var(--school-line);width:1px;height:18px}.project-button{border:1px solid var(--lightningcss-light,#dce3d4)var(--lightningcss-dark,var(--night-border));background:var(--lightningcss-light,#fafbf6)var(--lightningcss-dark,var(--night-surface));color:var(--lightningcss-light,#4b6449)var(--lightningcss-dark,var(--night-accent));white-space:nowrap;border-radius:6px;align-items:center;gap:8px;padding:8px 12px;display:flex;font-size:12px!important}.project-button:hover{background:var(--lightningcss-light,#eef3e7)var(--lightningcss-dark,var(--night-surface))}.icon-button{width:30px;height:30px;color:var(--lightningcss-light,#85907e)var(--lightningcss-dark,var(--night-accent));background:0 0;border:0;border-radius:5px;justify-content:center;align-items:center;display:inline-flex}.icon-button:hover{background:var(--lightningcss-light,#e8ede2)var(--lightningcss-dark,var(--night-raised));color:var(--lightningcss-light,#395a3f)var(--lightningcss-dark,var(--night-accent))}.icon-button:disabled{opacity:.35}.mobile-menu{display:none}.school-sidebar{border-right:1px solid var(--school-line);background:var(--lightningcss-light,#f6f7f1)var(--lightningcss-dark,var(--night-surface));scrollbar-width:thin;flex-direction:column;width:239px;padding:34px 19px 24px 24px;display:flex;position:fixed;top:76px;bottom:0;left:0;overflow:auto}.section-eyebrow{letter-spacing:.11em;color:var(--lightningcss-light,#8a9281)var(--lightningcss-dark,var(--night-muted));font-size:10px;font-weight:500}.journey-intro h2{letter-spacing:-.5px;margin-top:9px;font-size:19px;font-weight:650}.journey-intro p{color:var(--lightningcss-light,#8b9383)var(--lightningcss-dark,var(--night-muted));margin-top:7px;font-size:11px}.journey-decoration{width:160px;color:var(--lightningcss-light,#869f7a)var(--lightningcss-dark,var(--night-accent));align-items:center;gap:8px;margin:19px 0 29px;display:flex}.journey-decoration span{background:var(--lightningcss-light,#dfe6d6)var(--lightningcss-dark,var(--night-raised));border-radius:3px;width:36px;height:3px}.journey-decoration span:first-child{background:var(--lightningcss-light,#809b77)var(--lightningcss-dark,var(--night-raised))}.route-label{letter-spacing:.12em;color:var(--lightningcss-light,#929986)var(--lightningcss-dark,var(--night-muted));justify-content:space-between;align-items:center;margin-bottom:15px;padding-right:6px;font-size:9px;display:flex}.route-label span:last-child{font-family:ui-monospace,monospace;font-size:9px}.lesson-nav{flex-direction:column;gap:7px;display:flex;position:relative}.lesson-nav:before{content:"";background:var(--lightningcss-light,#dee3d7)var(--lightningcss-dark,var(--night-raised));width:1px;position:absolute;top:33px;bottom:34px;left:21px}.lesson-link{z-index:1;text-align:left;width:100%;min-height:70px;color:var(--lightningcss-light,#7f8878)var(--lightningcss-dark,var(--night-accent));background:0 0;border:1px solid #0000;border-radius:8px;align-items:center;gap:10px;padding:13px 8px 13px 7px;display:flex;position:relative}.lesson-link.is-current{background:var(--lightningcss-light,#eaf0e2)var(--lightningcss-dark,var(--night-raised));border-color:var(--lightningcss-light,#d9e2cf)var(--lightningcss-dark,var(--night-border));color:var(--lightningcss-light,#38563a)var(--lightningcss-dark,var(--night-accent));box-shadow:0 2px 3px var(--lightningcss-light,#3d543605)var(--lightningcss-dark,#00000005)}.lesson-link:hover:not(.is-current){background:var(--lightningcss-light,#eef1e8)var(--lightningcss-dark,var(--night-surface))}.lesson-number{letter-spacing:.02em;border:1px solid var(--lightningcss-light,#dde4d5)var(--lightningcss-dark,var(--night-border));background:var(--lightningcss-light,#f6f7f1)var(--lightningcss-dark,var(--night-surface));width:27px;height:27px;color:var(--lightningcss-light,#939e85)var(--lightningcss-dark,var(--night-accent));border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-family:ui-monospace,monospace;font-size:10px;display:flex}.is-current .lesson-number,.is-complete .lesson-number{background:var(--school-action-bg);color:#fff;border-color:var(--school-green)}.lesson-link-text{flex-direction:column;flex:1;gap:3px;min-width:0;display:flex}.lesson-link-text strong{font-size:11px;font-weight:550;line-height:1.6}.lesson-link-text>span{color:var(--lightningcss-light,#909781)var(--lightningcss-dark,var(--night-muted));font-size:10px;line-height:1.6}.current-indicator{background:var(--lightningcss-light,#6e8f5c)var(--lightningcss-dark,var(--night-accent));border-radius:50%;flex-shrink:0;width:5px;height:5px}.sidebar-progress{border-top:1px solid var(--lightningcss-light,#e0e5d7)var(--lightningcss-dark,var(--night-border));margin:29px 7px 0 0;padding-top:20px}.sidebar-progress>div:first-child{color:var(--lightningcss-light,#7c8771)var(--lightningcss-dark,var(--night-accent));justify-content:space-between;font-size:11px;display:flex}.sidebar-progress strong{color:var(--lightningcss-light,#4b6643)var(--lightningcss-dark,var(--night-accent));font-family:ui-monospace,monospace;font-size:12px;font-weight:500}.sidebar-progress strong span{color:var(--lightningcss-light,#a0a68f)var(--lightningcss-dark,var(--night-muted))}.segmented-progress{gap:4px;margin-top:12px;display:flex}.segmented-progress>span{background:var(--lightningcss-light,#e3e8dc)var(--lightningcss-dark,var(--night-raised));border-radius:2px;flex:1;height:4px;transition:background .4s}.segmented-progress>span.is-filled{background:var(--lightningcss-light,#6e8d59)var(--lightningcss-dark,var(--night-accent))}.sidebar-progress p{color:var(--lightningcss-light,#929b84)var(--lightningcss-dark,var(--night-accent));align-items:flex-start;gap:6px;margin-top:10px;font-size:9px;line-height:1.7;display:flex}.sidebar-progress p .tiny-dot{flex-shrink:0;margin-top:5px}.tiny-dot{background:var(--lightningcss-light,#92a582)var(--lightningcss-dark,var(--night-accent));border-radius:50%;flex-shrink:0;width:4px;height:4px;display:inline-block}.tiny-dot.storage-warning{background:var(--lightningcss-light,#bd8358)var(--lightningcss-dark,var(--night-warning))}.sidebar-extras{margin-top:39px}.extra-link{align-items:center;gap:10px;margin-top:14px;display:flex}.extra-icon{border:1px solid var(--lightningcss-light,#dfe4d7)var(--lightningcss-dark,var(--night-border));width:31px;height:35px;color:var(--lightningcss-light,#8a987c)var(--lightningcss-dark,var(--night-accent));background:var(--lightningcss-light,#fbfbf7)var(--lightningcss-dark,var(--night-surface));border-radius:6px;justify-content:center;align-items:center;display:flex}.extra-link>span:nth-child(2){flex-direction:column;flex:1;gap:2px;display:flex}.extra-link strong{font-size:11px;font-weight:500}.extra-link small{color:var(--lightningcss-light,#929a85)var(--lightningcss-dark,var(--night-muted));font-size:9px}.extra-link>svg{color:var(--lightningcss-light,#89957a)var(--lightningcss-dark,var(--night-accent))}.extra-link:hover strong{color:var(--lightningcss-light,#387143)var(--lightningcss-dark,var(--night-accent))}.sidebar-bottom{color:var(--lightningcss-light,#98a088)var(--lightningcss-dark,var(--night-muted));margin-top:auto;padding-top:50px}.sidebar-bottom p{margin-top:9px;font-size:10px}.sidebar-bottom>span{letter-spacing:.12em;color:var(--lightningcss-light,#afb5a5)var(--lightningcss-dark,var(--night-muted));margin-top:8px;font-family:ui-monospace,monospace;font-size:7px;display:block}.classroom-main{min-width:0;max-width:1535px;margin-left:239px;padding:28px 40px 0}.classroom-breadcrumb{color:var(--lightningcss-light,#909889)var(--lightningcss-dark,var(--night-muted));align-items:center;gap:9px;min-height:20px;font-size:10px;display:flex}.classroom-breadcrumb>span:nth-child(3){color:var(--lightningcss-light,#62705b)var(--lightningcss-dark,var(--night-accent))}.beginner-label{color:var(--lightningcss-light,#7e8b70)var(--lightningcss-dark,var(--night-accent));align-items:center;gap:6px;margin-left:auto;font-size:10px;display:flex}.beginner-label .tiny-dot{background:var(--lightningcss-light,#80a377)var(--lightningcss-dark,var(--night-raised))}.lesson-hero{justify-content:space-between;align-items:center;gap:10px;min-height:229px;padding:29px 0 25px;animation:.35s ease-out lesson-in;display:flex;position:relative}.lesson-hero-copy{z-index:1;max-width:670px;position:relative}.lesson-eyebrow{letter-spacing:.1em;color:var(--lightningcss-light,#6e865c)var(--lightningcss-dark,var(--night-accent));align-items:center;gap:12px;font-size:9px;font-weight:550;display:flex}.hero-time{letter-spacing:0;color:var(--lightningcss-light,#99a087)var(--lightningcss-dark,var(--night-muted));border-left:1px solid var(--lightningcss-light,#d9dfcf)var(--lightningcss-dark,var(--night-border));padding-left:12px;font-weight:400}.lesson-hero h1{letter-spacing:-.045em;margin-top:10px;font-size:clamp(28px,2.8vw,42px);font-weight:600;line-height:1.45;outline:none!important}.lesson-hero h1>span{display:block}.lesson-hero-copy>p{color:var(--lightningcss-light,#828b78)var(--lightningcss-dark,var(--night-accent));max-width:490px;margin-top:13px;font-size:12px;line-height:1.9}.road-illustration{flex-shrink:0;align-self:center;width:247px;max-width:31%;margin-top:4px}.learning-workspace{grid-template-columns:minmax(0,1fr) minmax(0,1.04fr);align-items:start;gap:28px;display:grid}.instruction-column,.result-column{min-width:0}.section-title{letter-spacing:.04em;color:var(--lightningcss-light,#5d6c54)var(--lightningcss-dark,var(--night-accent));align-items:center;gap:9px;margin-bottom:12px;font-size:10px;font-weight:600;display:flex}.step-chip{background:var(--lightningcss-light,#eaf0e2)var(--lightningcss-dark,var(--night-raised));width:20px;height:20px;color:var(--lightningcss-light,#70865e)var(--lightningcss-dark,var(--night-accent));border-radius:5px;justify-content:center;align-items:center;font-family:ui-monospace,monospace;font-size:9px;font-weight:400;display:flex}.title-rule{background:var(--school-line);flex:1;height:1px;margin-left:4px}.concept-card{background:var(--lightningcss-light,#f0f3e9)var(--lightningcss-dark,var(--night-surface));border:1px solid var(--lightningcss-light,#e3e8d8)var(--lightningcss-dark,var(--night-border));border-radius:9px;align-items:flex-start;gap:12px;padding:17px 17px 14px;display:flex}.concept-icon{background:var(--lightningcss-light,#e3ead5)var(--lightningcss-dark,var(--night-raised));width:29px;height:29px;color:var(--lightningcss-light,#7c905a)var(--lightningcss-dark,var(--night-warning));border-radius:7px;flex-shrink:0;justify-content:center;align-items:center;display:flex}.concept-card h2{margin-top:3px;font-size:12px;font-weight:600;line-height:1.8}.concept-card p{color:var(--lightningcss-light,#78826c)var(--lightningcss-dark,var(--night-accent));margin-top:5px;font-size:11px;line-height:1.95}.inline-link{color:var(--lightningcss-light,#698051)var(--lightningcss-dark,var(--night-accent));background:0 0;border:0;align-items:center;gap:4px;margin-top:8px;padding:0;display:inline-flex;font-size:10px!important}.inline-link:hover{color:var(--lightningcss-light,#315c35)var(--lightningcss-dark,var(--night-accent));text-underline-offset:3px;text-decoration:underline}.practice-section{margin-top:24px}.practice-task{margin-bottom:14px}.practice-task h2{align-items:center;gap:7px;font-size:12px;font-weight:600;display:flex}.practice-task h2 svg{color:var(--lightningcss-light,#738e5d)var(--lightningcss-dark,var(--night-accent))}.practice-task p{color:var(--lightningcss-light,#7e8675)var(--lightningcss-dark,var(--night-muted));margin-top:6px;font-size:12px;line-height:1.9}.prompt-editor{border:1px solid var(--lightningcss-light,#d8dfcf)var(--lightningcss-dark,var(--night-border));background:var(--lightningcss-light,#fffefa)var(--lightningcss-dark,var(--night-surface));border-radius:9px;transition:border-color .2s,box-shadow .2s;overflow:hidden;box-shadow:0 3px 12px var(--lightningcss-light,#35462804)var(--lightningcss-dark,#00000004)}.prompt-editor:focus-within{border-color:var(--lightningcss-light,#9cb58c)var(--lightningcss-dark,var(--night-border));box-shadow:0 0 0 3px var(--lightningcss-light,#7e9e6910)var(--lightningcss-dark,#00000010)}.prompt-editor.has-error{border-color:var(--lightningcss-light,#ce987d)var(--lightningcss-dark,var(--night-danger))}.editor-heading{border-bottom:1px solid var(--lightningcss-light,#edf0e7)var(--lightningcss-dark,var(--night-border));justify-content:space-between;align-items:center;gap:8px;padding:12px 14px;display:flex}.editor-heading label{color:var(--lightningcss-light,#68705d)var(--lightningcss-dark,var(--night-muted));align-items:center;gap:7px;font-size:11px;display:flex}.editor-heading label svg{color:var(--lightningcss-light,#8a957a)var(--lightningcss-dark,var(--night-accent))}.editor-heading>span{color:var(--lightningcss-light,#91a080)var(--lightningcss-dark,var(--night-accent));white-space:nowrap;align-items:center;gap:5px;font-size:9px;display:flex}.prompt-editor textarea{resize:vertical;width:100%;min-height:142px;color:var(--lightningcss-light,#3d5139)var(--lightningcss-dark,var(--night-ink));background:0 0;border:0;max-height:500px;padding:15px 16px 8px;font-size:12px;line-height:1.9;display:block;outline:none!important}.editor-tools{justify-content:space-between;align-items:center;gap:10px;padding:0 14px 12px;display:flex}.editor-tools>button{background:var(--lightningcss-light,#f0f3e9)var(--lightningcss-dark,var(--night-surface));color:var(--lightningcss-light,#899577)var(--lightningcss-dark,var(--night-accent));border:0;border-radius:4px;align-items:center;gap:4px;padding:4px 7px;display:flex;font-size:9px!important}.editor-tools>button:hover{background:var(--lightningcss-light,#e4edd9)var(--lightningcss-dark,var(--night-raised));color:var(--lightningcss-light,#47653c)var(--lightningcss-dark,var(--night-accent))}.editor-tools>span{color:var(--lightningcss-light,#b0b69f)var(--lightningcss-dark,var(--night-muted));font-family:ui-monospace,monospace;font-size:9px}.editor-run{background:var(--lightningcss-light,#fafbf6)var(--lightningcss-dark,var(--night-surface));border-top:1px solid var(--lightningcss-light,#ecf0e3)var(--lightningcss-dark,var(--night-border));justify-content:space-between;align-items:center;gap:9px;padding:12px 13px;display:flex}.school-button{white-space:normal;border:1px solid #0000;border-radius:6px;justify-content:center;align-items:center;gap:8px;padding:10px 14px;font-weight:500;line-height:1.5;text-decoration:none;display:inline-flex;font-size:11px!important}.button-primary{background:var(--school-action-bg);color:#fffdf5;border-color:var(--school-green);box-shadow:0 2px 3px var(--lightningcss-light,#253c2110)var(--lightningcss-dark,#00000010)}.button-primary:hover:not(:disabled){background:var(--school-action-hover);border-color:var(--school-green-dark);box-shadow:0 3px 7px var(--lightningcss-light,#253c2120)var(--lightningcss-dark,#00000020)}.button-primary:disabled{opacity:.65}.button-primary>svg:last-child{margin-left:4px}.button-outline{border-color:var(--lightningcss-light,#dbe2cf)var(--lightningcss-dark,var(--night-border));background:var(--lightningcss-light,#fafbf5)var(--lightningcss-dark,var(--night-surface));color:var(--lightningcss-light,#667b50)var(--lightningcss-dark,var(--night-accent))}.button-outline:hover{border-color:var(--lightningcss-light,#aabf96)var(--lightningcss-dark,var(--night-border));background:var(--lightningcss-light,#eff5e5)var(--lightningcss-dark,var(--night-surface))}.button-quiet{color:var(--lightningcss-light,#82916e)var(--lightningcss-dark,var(--night-accent));background:0 0;border:0;padding:6px 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