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16px;color:var(--muted)}table{width:100%;border-collapse:collapse;font-size:14px}th,td{padding:11px 10px;border-bottom:1px solid var(--line);text-align:left}th{font-weight:600;color:var(--muted);font-size:14px}.table-wrap{overflow:auto}dialog{max-width:760px;border:1px solid var(--line);border-radius:6px;box-shadow:0 20px 70px #20336a33;padding:24px}dialog::backdrop{background:#15234360}.operation{padding:14px 0;border-bottom:1px solid var(--line);margin:0}.operation>p{font-size:14px;color:var(--muted);margin:8px 0}.operation details{font-size:14px}.operation details pre{font-size:13px}.saved{color:var(--blue)}.pill-count{font-size:14px}.demo-import{margin:12px 0}.signed-out .primary-nav,.signed-out .profile-menu,.signed-out .menu-toggle{display:none}.signed-out #main{max-width:480px;padding-top:56px}.login-layout{display:block}.login-layout .account-card{width:100%;max-width:none;margin:0}.login-layout h1{font-size:27px}.login-layout .primary{background:var(--red);border-color:var(--red);width:100%;margin-top:8px}.login-layout form{margin-bottom:16px}.signed-out .site-header{position:static}.signed-out .header-inner{max-width:1328px}

.brand-red,.button.brand-red{background:var(--red);border-color:var(--red);color:#fff}.brand-red:hover{background:#bf293a;border-color:#bf293a}.inline-links,.section-actions{display:flex;gap:12px 24px;align-items:center;flex-wrap:wrap}.inline-links{margin:18px 0}.page-heading:has(>a){display:flex;align-items:center;justify-content:space-between;gap:16px}.page-heading:has(>.actions){display:flex;align-items:center;justify-content:space-between;gap:20px}.page-heading>.actions{margin:0}.course-description{max-width:850px;color:var(--muted)}.data-row-main{flex:1;min-width:0}.data-row-actions{display:flex;gap:12px;flex-shrink:0}.knowledge-row>div{flex:1}.filter-details{margin:12px 0 20px}.filter-options{display:flex;gap:16px;align-items:end;flex-wrap:wrap}.filter-options label{flex:1 1 160px}.lesson-row .compact-details{margin:5px 0 0;border:0}.lesson-row .compact-details>summary{padding:2px 0;margin:0}.lesson-task-list a{display:flex;align-items:center;gap:16px;justify-content:space-between;font-size:14px}.lesson-row.is-next{background:none}.lesson-row.is-next .step-number{background:#fff0f2;border-radius:3px}.history-entry>summary{display:flex;gap:20px;align-items:center;flex-wrap:wrap}.history-entry>summary>strong{flex:1}.history-entry>summary::before{content:'+';color:var(--blue)}.history-entry[open]>summary::before{content:'−'}.prerequisite-note{font-size:14px;color:var(--muted);margin-top:8px}.practice-history{margin-top:24px}.accounts-layout{align-items:start}.lesson-related{max-width:820px}.lesson-prose~[data-tutor-slot]{max-width:820px}
@media(max-width:700px){.page-heading:has(>a),.page-heading:has(>.actions){align-items:flex-start;flex-wrap:wrap}.data-row-actions{flex-wrap:wrap}.history-entry>summary{gap:6px 12px}.history-entry>summary>strong{flex-basis:calc(100% - 28px)}.lesson-row .compact-details>summary{padding:4px 0}.course-outline .lesson-row>.button{margin-left:37px}.inline-links{gap:10px 18px}}

/* Task workspace: statement and editor share one column; help stays beside them. */
.task-page-layout{display:grid;grid-template-columns:minmax(0,1fr) 308px;gap:32px;align-items:start}
.task-main,.task-statement{min-width:0}
.task-statement{font-size:16px;line-height:1.65;padding:0 0 24px;border-bottom:1px solid var(--line);margin-bottom:28px}
.task-statement h1{font-size:27px;line-height:1.3;margin:0 0 8px}
.task-heading{margin-bottom:24px}
.task-limits{display:flex;gap:6px 20px;flex-wrap:wrap;color:var(--muted);font-size:14px;line-height:1.5;margin:8px 0 0}
.task-statement h2,.task-statement h3{font-size:18px;margin:24px 0 10px}
.task-statement p{margin:0 0 12px}
.task-statement ul,.task-statement ol{padding-left:24px}
.task-statement pre{font-size:14px;max-height:360px}
.task-statement .compact-details{margin:14px 0 0}
.task-statement .compact-details:last-child{margin-bottom:0}
.task-statement .field-grid{grid-template-columns:minmax(0,1fr);gap:0}
.sample-tests{margin-top:14px}
.sample-example{border:1px solid var(--line);border-radius:4px;overflow:hidden;margin:14px 0 18px}
.sample-example .sample-label{display:flex;align-items:center;justify-content:space-between;gap:12px;background:#f5f7fc;padding:7px 12px;font-size:14px;font-weight:600}
.sample-example .sample-label:not(:first-child){border-top:1px solid var(--line)}
.sample-example pre{border:0;border-radius:0;margin:0;padding:10px 12px;min-height:38px;background:#fff;color:var(--ink);white-space:pre-wrap;overflow-wrap:anywhere}
.sample-example .sample-label button{min-height:26px;padding:2px 8px;font-size:13px;font-weight:400;background:transparent;border:0}
.task-main .solution-workspace{scroll-margin-top:80px}
.task-main .solution-workspace>h2,.task-main .solution-heading h2{font-size:22px;margin-bottom:14px}
.task-main .editor-bottom{gap:10px 16px;flex-wrap:wrap}
.task-main .editor-bottom #code-status{margin-right:auto}
.task-main .editor-bottom .actions{margin:0;gap:8px}
.task-main #run-samples-button{background:var(--blue);border-color:var(--blue);color:#fff}
.task-main #run-samples-button:hover{background:#1e3eaa;border-color:#1e3eaa}
.task-main #solve-button{background:var(--red);border-color:var(--red);color:#fff}
.task-main .editor-actions{margin:10px 0 18px}
.task-main #task-results{margin-top:24px}
.task-main #task-results>h2{font-size:21px}
#sample-results:empty{display:none}
.sample-run{padding:16px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin:16px 0 22px}
.sample-run>h2,.sample-run>h3{font-size:18px;margin:0 0 10px}
.sample-run>.row{align-items:flex-start}
.sample-run .item-meta,.sample-run>.muted{font-size:14px;margin:6px 0 12px}
.sample-case{padding:12px 0;margin:0;border:0;border-top:1px solid var(--line)}
.sample-case>summary{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:0;font-weight:600}
.sample-case>summary::before{content:'▸';color:var(--blue)}
.sample-case[open]>summary::before{content:'▾'}
.sample-case>summary .badge{margin-left:auto}
.sample-case>h4{font-size:15px;margin:0 0 8px}
.sample-io{display:grid;grid-template-columns:minmax(0,1fr);gap:0;margin-top:12px}
.sample-io>div{min-width:0}
.sample-io label,.sample-io h4{font-size:14px;font-weight:600;margin:8px 0 5px}
.sample-io pre{font-size:13px;padding:9px 11px;margin:0 0 10px;max-height:240px}
.sample-io pre:empty::before{content:'(пусто)';font-style:italic;color:var(--muted)}
.task-chat{position:sticky;top:80px;min-width:0;border-left:1px solid var(--line);padding-left:20px;height:calc(100dvh - 150px);max-height:900px;scroll-margin-top:80px}
#task-chat-slot #learning-help{height:100%;min-height:0;display:flex;flex-direction:column;padding:0;margin:0}
#task-chat-slot .chat-header{flex-shrink:0;border-bottom:1px solid var(--line);padding-bottom:12px}
#task-chat-slot .chat-header h2{font-size:19px;margin:0 0 8px;color:var(--blue)}
#task-chat-slot .chat-header p{font-size:14px;line-height:1.5;margin:0;color:var(--muted)}
#task-chat-slot #dialogue{flex:1;min-height:0;overflow:auto;overflow-x:hidden;overscroll-behavior:contain;padding:14px 0;scrollbar-width:thin}
#task-chat-slot #dialogue .result{padding:0 0 16px;border:0;border-bottom:1px solid var(--line);margin:0 0 16px;overflow-wrap:anywhere}
#task-chat-slot #dialogue .result:last-child{border-bottom:0;margin-bottom:0;padding-bottom:0}
#task-chat-slot #dialogue .result h4{font-size:14px;line-height:1.5;padding:8px 10px;margin:0 0 12px;background:#eef3ff;border-radius:4px;color:#213d8d;font-weight:500}
#task-chat-slot #dialogue p{font-size:14px;line-height:1.6;margin:0 0 10px}
#task-chat-slot #dialogue pre{font-size:12px;padding:8px;max-height:280px}
#task-chat-slot #dialogue ul,#task-chat-slot #dialogue ol{padding-left:20px;font-size:14px}
#task-chat-slot #dialogue .small{font-size:13px}
#task-chat-slot .chat-exchange{border-bottom:1px solid var(--line);padding:0 0 16px;margin:0 0 16px;overflow-wrap:anywhere}
#task-chat-slot .chat-exchange:last-child{border-bottom:0;margin-bottom:0;padding-bottom:0}
#task-chat-slot .chat-question{font-size:14px;line-height:1.5;padding:9px 11px;margin:0 0 12px;background:#eef3ff;border-radius:4px;color:#213d8d;white-space:pre-wrap}
#task-chat-slot .chat-answer{font-size:14px;line-height:1.6;max-width:none}
#task-chat-slot .chat-answer h2,#task-chat-slot .chat-answer h3{font-size:15px;margin:14px 0 8px}
#task-chat-slot .chat-source{display:block;font-size:13px;line-height:1.5;color:var(--muted);margin-top:8px}
#task-chat-slot .chat-empty{color:var(--muted);font-size:14px;line-height:1.6;padding:8px 0}
#task-chat-slot #question-form{flex-shrink:0;border-top:1px solid var(--line);padding:12px 0 0;margin:0;max-width:none}
#task-chat-slot #question-form label{font-size:14px;margin:0 0 10px;font-weight:500}
#task-chat-slot #question-form select{font-size:14px;padding:6px 8px;min-height:34px;max-width:100%}
#task-chat-slot #question-form textarea{font-size:14px;line-height:1.5;min-height:88px;max-height:180px;padding:8px 10px;resize:vertical}
#task-chat-slot #question-form button{width:100%;font-size:14px;min-height:36px}
#task-chat-slot #chat-status{display:block;font-size:14px;margin-top:7px;line-height:1.4}
#task-chat-slot #chat-status:empty{display:none}
.preview-task{display:block;max-width:920px}
.preview-task>.prose{max-width:none}
.preview-task>.preview-editor{max-width:none;margin-top:26px}
.task-chat-jump{display:none}

.task-main .editor-run-actions{display:flex;gap:8px;align-items:stretch;flex-wrap:wrap}
.sample-run-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:10px}
.sample-run-heading h3{font-size:18px;margin:0}
.sample-summary{font-size:14px;color:var(--muted);margin-bottom:14px}
.sample-verdict{margin-left:auto;font-size:14px;font-weight:500}
.sample-passed{color:var(--blue)}.sample-failed{color:#b0233b}
.sample-example>h3{font-size:14px;margin:0;padding:8px 12px;background:#fff}
.empty-output{color:var(--muted);font-style:italic}
@media(max-width:700px){.task-main .editor-run-actions{width:100%;gap:8px}.task-main .editor-run-actions button{flex:1;min-width:0;min-height:42px;font-size:13px}.sample-run-heading{gap:10px;flex-wrap:wrap}.sample-run-heading h3{font-size:17px}}
@media(min-width:1400px){.task-page-layout{grid-template-columns:minmax(0,1fr) 320px;gap:36px}}
@media(max-width:1100px){.task-page-layout{gap:24px;grid-template-columns:minmax(0,1fr) 290px}.task-chat{padding-left:18px}}
@media(max-width:1000px){.task-page-layout{grid-template-columns:minmax(0,1fr);gap:28px}.task-chat{position:static;border-left:0;border-top:1px solid var(--line);padding:20px 0 0;height:auto;max-height:none}.task-main .solution-workspace{scroll-margin-top:72px}.task-chat-jump{display:inline-flex}#task-chat-slot #dialogue{flex:none;min-height:140px;max-height:380px}#task-chat-slot #learning-help{height:auto;max-width:none}#task-chat-slot #question-form .chat-send{display:flex;align-items:center;gap:12px;flex-wrap:wrap}#task-chat-slot #question-form button{width:auto;min-width:170px}#task-chat-slot #chat-status{margin:0;flex:1;min-width:180px}.task-statement{margin-bottom:24px}}
@media(max-width:700px){.task-page-layout{gap:24px}.task-statement{font-size:15px;padding-bottom:20px}.task-statement h1{font-size:25px}.task-statement h2,.task-statement h3{font-size:17px;margin-top:20px}.task-heading{margin-bottom:20px}.task-limits{font-size:13px;gap:4px 14px}.task-main .solution-workspace>h2{font-size:21px}.task-main .editor-bottom{padding:10px;gap:10px}.task-main .editor-bottom #code-status{flex-basis:100%}.task-main .editor-bottom .actions{width:100%;gap:8px}.task-main .editor-bottom button{font-size:13px;padding:7px 10px;flex:1}.task-main .editor-bottom .primary{margin-left:0}.task-chat{height:auto}.sample-run .row{gap:8px}.sample-example .sample-label{padding:7px 10px}.sample-example pre{font-size:13px;padding:9px 10px}.sample-case>summary{font-size:14px}.sample-io pre{font-size:13px}}

@media(max-width:1100px){.header-inner{gap:20px}.primary-nav>a,.primary-nav>details>summary{padding:0 9px}.profile-menu #account-name{max-width:100px}.task-layout{gap:24px}.author-layout{grid-template-columns:220px minmax(0,1fr);gap:24px}}
@media(max-width:850px){.site-header{height:56px}.header-inner{padding:0 18px;gap:16px}.brand{font-size:17px}.profile-menu #account-name{display:none}.primary-nav>a,.primary-nav>details>summary{font-size:13px;padding:0 8px}.task-layout,.preview-task{grid-template-columns:minmax(0,1fr)}#main{padding:24px 20px 40px}.next-step{gap:16px}.course-row-actions{flex-direction:column;align-items:flex-end;gap:6px}.form-columns{gap:24px}.author-edit-context{flex-wrap:wrap}}
@media(max-width:700px){.site-header{height:54px}.header-inner{padding:0 16px;gap:14px}.brand{font-size:17px}.brand-mark{width:25px;height:27px;font-size:23px}.menu-toggle{display:inline-flex;margin-left:auto;padding:5px 8px;min-height:32px;border:0;font-size:14px;gap:8px;color:var(--blue)}.profile-menu{margin-left:0!important}.profile-menu>summary{gap:4px}.profile-menu>summary>span:last-child{display:none}.primary-nav{display:none;position:absolute;left:0;right:0;top:54px;height:auto;background:white;padding:12px 16px 16px;border-bottom:1px solid #d2dcec;box-shadow:0 8px 20px #142d6410;flex-wrap:wrap;gap:4px;max-height:calc(100vh - 70px);overflow:auto}.menu-open .primary-nav{display:flex}.primary-nav>a{flex:1 1 calc(50% - 8px);min-height:42px;padding:8px 10px;font-size:15px;border-bottom:0;border-radius:3px}.primary-nav>a.active{background:#f0f4ff;border-left:3px solid var(--red)}.primary-nav>.nav-more{flex-basis:100%}.primary-nav>.nav-more>summary{height:auto;min-height:40px;font-size:15px;padding:8px 10px}.primary-nav .nav-popover{position:static;box-shadow:none;border:0;border-top:1px solid var(--line);border-radius:0;display:grid;grid-template-columns:1fr 1fr;min-width:0;padding:8px 0 0;gap:4px}.primary-nav .nav-popover a{font-size:14px;padding:9px 10px}.profile-menu .nav-popover{right:0;top:calc(100% + 10px)}.menu-open .profile-menu .nav-popover{z-index:50}#main{padding:20px 16px 36px}h1{font-size:25px}h2{font-size:20px}.page-heading{margin-bottom:18px}.page-heading.row{align-items:flex-start;flex-wrap:wrap;gap:8px}.page-lead{font-size:15px}.next-step{align-items:flex-start;flex-wrap:wrap;padding:12px 0 12px 12px;margin-bottom:18px;gap:12px}.next-step h2{font-size:21px}.next-step .primary{min-width:160px}.overview-line{gap:10px;margin:14px 0 18px}.inline-stats{gap:7px 18px;font-size:14px}.inline-stats strong{font-size:17px}.course-row,.data-row{flex-wrap:wrap;gap:10px;padding:13px 0}.course-row-main{flex-basis:100%}.course-row-actions{flex-direction:row;align-items:center;gap:14px}.course-row h2,.course-row h3{font-size:18px}.section-heading{margin:22px 0 10px;align-items:flex-start;flex-wrap:wrap;gap:6px}.lesson-row{gap:11px;padding:13px 0;flex-wrap:wrap}.lesson-row>div{flex-basis:calc(100% - 50px)}.lesson-row>.item-meta{margin-left:37px}.lesson-row>.button{margin-left:37px}.lesson-row h3{font-size:16px}.step-number{font-size:14px;width:25px;min-width:25px}.task-row{flex-wrap:nowrap}.task-row>span:last-child{font-size:14px}.crumb{font-size:14px;margin-bottom:15px}.prose{font-size:16px;line-height:1.65}.prose h2{font-size:20px;margin-top:22px}.prose h3{font-size:17px}.prose pre{font-size:13px}.preview-banner{flex-wrap:wrap;gap:5px 12px;font-size:14px}.preview-banner>a{margin-left:0}.preview-banner>.muted{font-size:14px}.preview-task{gap:20px}.task-layout{gap:24px}.statement h1{font-size:25px}.field-grid,.form-columns{grid-template-columns:minmax(0,1fr);gap:18px}.editor-top{font-size:13px}.editor-bottom{flex-wrap:wrap;gap:10px}.editor-bottom .primary{margin-left:auto}.editor-bottom span{font-size:13px}.cm-scroller,.cm-editor{min-height:280px}.author-layout{grid-template-columns:minmax(0,1fr);gap:22px}.author-sidebar{position:static;max-height:340px;padding:0 0 12px;border:0;border-bottom:1px solid var(--line)}.author-sidebar h2{font-size:17px}.author-toolbar,.compact-toolbar{flex-wrap:wrap;gap:10px;margin-bottom:16px}.compact-toolbar .actions,.author-toolbar .actions{gap:6px}.workspace-tabs{gap:16px;flex-wrap:wrap;margin-bottom:16px}.workspace-tabs a{font-size:14px;padding:7px 0}.row{flex-wrap:wrap;gap:8px}.result .row{align-items:center}.result .meta{gap:5px 13px}.lesson-toolbar{flex-wrap:wrap}.context-help{margin:12px 0}.learning-filters{display:flex;gap:10px}.learning-filters label{flex-basis:calc(50% - 10px);min-width:130px}.learning-filters button{align-self:end}.form-columns .form-section{margin-bottom:8px}.account-row summary{line-height:1.9}.signed-out #main{padding:36px 20px}#toast{left:16px;right:16px;bottom:16px;max-width:none;font-size:14px}#connection:not(:empty){margin:8px 16px 0}.data-list .actions{margin:6px 0}.stat-grid{gap:18px}.graph-scroll svg{min-width:900px}}
@media(max-width:480px){.learning-filters>label,.filter-options>label{flex-basis:100%;min-width:0}.course-outline .lesson-row{padding:12px 0}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}