:root{--focus-ring:0 0 0 3px #3265dc24;--control-height:46px}[hidden]{display:none!important}button,input,select,textarea{font:inherit}button{touch-action:manipulation}:where(button,a,input,select,textarea,summary):focus-visible{outline:3px solid var(--color-primary);outline-offset:3px}:where(button):disabled{cursor:not-allowed;opacity:.5}.btn-primary,.btn-ghost{border-radius:var(--radius-sm);white-space:nowrap;min-height:44px;transition:background var(--transition), border-color var(--transition), box-shadow var(--transition);justify-content:center;align-items:center;gap:8px;padding:10px 18px;font-size:15px;font-weight:550;line-height:1.4;display:inline-flex}.btn-primary{color:#fff;border:1px solid var(--color-primary);background:var(--color-primary);box-shadow:0 3px 8px #3265dc12}.btn-primary:hover:not(:disabled){border-color:var(--color-primary-strong);background:var(--color-primary-strong)}.btn-primary:active{transform:none}.btn-ghost{color:var(--color-text-2);border:1px solid var(--color-border);background:#fff}.btn-ghost:hover:not(:disabled){background:var(--color-surface-2);border-color:var(--color-border-strong);color:var(--color-text)}.btn-danger{background:var(--color-fail);border-color:var(--color-fail);color:#fff}.btn-danger:hover:not(:disabled){background:#a92929;border-color:#a92929}:is(.account-form input,.practice-search input,.practice-select-field select,.academy-mobile-selector select,.mock-outcome-form input,.mock-outcome-form select){min-height:var(--control-height);border:1px solid var(--color-border-strong);border-radius:var(--radius-sm);color:var(--color-text);transition:border-color var(--transition), box-shadow var(--transition);background-color:#fff;padding:11px 14px;font-size:16px;line-height:1.5}:is(.account-form input,.practice-search input,.practice-select-field select,.academy-mobile-selector select,.mock-outcome-form input,.mock-outcome-form select):focus{border-color:var(--color-primary);box-shadow:var(--focus-ring);outline:none}input::placeholder,textarea::placeholder{color:var(--color-text-3);opacity:1}:is(.practice-select-field select,.academy-mobile-selector select,.mock-outcome-form select){-webkit-appearance:none;appearance:none;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='none'%3E%3Cpath d='m5 7.5 5 5 5-5' stroke='%23536078' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-position:right 12px center;background-repeat:no-repeat;background-size:18px;padding-right:38px}:-webkit-any(input,textarea,select)[aria-invalid=true]{border-color:var(--color-fail)}:is(input,textarea,select)[aria-invalid=true]{border-color:var(--color-fail)}:-webkit-any(input,textarea,select)[aria-invalid=true]:focus{border-color:var(--color-fail);box-shadow:0 0 0 3px #bf303019}:is(input,textarea,select)[aria-invalid=true]:focus{border-color:var(--color-fail);box-shadow:0 0 0 3px #bf303019}input[type=date]{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}input[type=checkbox],input[type=radio]{accent-color:var(--color-primary)}.app-header{background:#f4f7fff2;border-bottom:1px solid #1b294209}@supports ((-webkit-backdrop-filter:blur(16px)) or (backdrop-filter:blur(16px))){.app-header{-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);background:#f4f7ffdc}}.app-header-inner{max-width:1144px;height:var(--header-h);grid-template-columns:1fr auto 1fr;gap:24px;padding-inline-start:32px;padding-inline-end:32px;display:grid}.brand-sm,.entry-home{letter-spacing:-.04em;width:-moz-fit-content;width:fit-content;min-height:44px;color:var(--color-text);align-items:center;gap:10px;font-size:22px;font-weight:550;display:inline-flex}.brand-mark{color:#fff;background:linear-gradient(145deg,#497aeb,#3265dc);border-radius:11px;flex:0 0 36px;width:36px;height:36px;padding:5px;box-shadow:inset 0 1px 1px #ffffff40,0 3px 8px #3265dc1a}.brand-mark svg{width:100%;height:100%;display:block}.brand-word{font-family:var(--font-sans);letter-spacing:-.035em;align-items:center}.brand-up{object-fit:contain;width:2em;height:1.24em;display:block}.brand-cos{font-weight:650}.app-nav{align-self:center;align-items:center;gap:4px}.nav-link{border:0;border-radius:9px;min-height:44px;padding:9px 12px;font-weight:550}.nav-link:hover{background:#e8effc}.nav-link.active{background:var(--color-primary-weak);color:var(--color-primary);border:0}.app-user{justify-self:end;gap:8px;min-width:0}.app-user .btn-primary,.app-user .btn-ghost{min-height:40px;padding:8px 12px;font-size:13px}.app-user>.btn-primary{color:var(--color-text);border-color:var(--color-border);box-shadow:none;background:#ffffffb3}.app-user>.btn-primary:hover{color:var(--color-primary);background:#fff}.user-name{max-width:84px;font-weight:500}.user-avatar{color:var(--color-primary);background:#e5edfc}.app-skip-link{z-index:100;background:var(--color-primary);color:#fff;border-radius:10px;padding:12px 20px;position:fixed;top:-100px;left:16px}.app-skip-link:focus{top:12px}.page:-webkit-any(.academy-course-page,.practice-page,.mastery-page,.mock-home){max-width:1144px;padding:40px 32px 64px}.page:is(.academy-course-page,.practice-page,.mastery-page,.mock-home){max-width:1144px;padding:40px 32px 64px}:is(.academy-course-head h1,.practice-head>h1,.mastery-course-head>h1,.mock-home-title,.page-title){letter-spacing:-.035em;font-size:32px;font-weight:700;line-height:1.4}:-webkit-any(.academy-course-description,.practice-description,.mastery-record-description,.mock-home-copy){color:var(--color-text-2);margin:8px 0 0;font-size:16px;line-height:1.75}:is(.academy-course-description,.practice-description,.mastery-record-description,.mock-home-copy){color:var(--color-text-2);margin:8px 0 0;font-size:16px;line-height:1.75}.loading,.empty{font-size:15px;line-height:1.75}.academy-next,.mastery-next{margin:24px 0 28px}.next-problem-link{border:1px solid var(--color-border);width:100%;color:var(--color-text);transition:border-color var(--transition), background var(--transition);background:#fff;border-radius:12px;grid-template-columns:minmax(0,1fr) 20px;align-items:center;gap:20px;padding:16px 20px;display:grid}.next-problem-copy{gap:4px;min-width:0;display:grid}.next-problem-label{color:var(--color-text-2);font-size:13px;font-weight:500;line-height:1.6}.next-problem-title{word-break:keep-all;overflow-wrap:anywhere;font-size:17px;font-weight:550;line-height:1.6}.next-problem-arrow{width:20px;height:20px;color:var(--color-primary);display:flex}.next-problem-arrow svg{width:100%;height:100%}.next-problem-link:hover{border-color:var(--color-primary-weak-border);background:#f8faff}.next-problem-link:hover .next-problem-title{color:var(--color-primary)}:-webkit-any(.academy-error,.practice-error,.mastery-error){border:1px solid var(--color-border);border-radius:var(--radius-lg);background:#fff;padding:40px 28px}:is(.academy-error,.practice-error,.mastery-error){border:1px solid var(--color-border);border-radius:var(--radius-lg);background:#fff;padding:40px 28px}:-webkit-any(.entry-error,.mock-inline-error){color:var(--color-fail);font-size:14px;line-height:1.6}:is(.entry-error,.mock-inline-error){color:var(--color-fail);font-size:14px;line-height:1.6}:-webkit-any(.entry-error,.mock-inline-error):not(:empty){background:var(--color-fail-bg);border:1px solid var(--color-fail-border);border-radius:10px;padding:12px 14px}:is(.entry-error,.mock-inline-error):not(:empty){background:var(--color-fail-bg);border:1px solid var(--color-fail-border);border-radius:10px;padding:12px 14px}:-webkit-any(.entry-error,.mock-inline-error):empty{display:none}:is(.entry-error,.mock-inline-error):empty{display:none}:-webkit-any(.wasm-pill,.badge,.solve-complete-badge,.lesson-complete-badge){border-radius:8px;font-size:13px;font-weight:550}:is(.wasm-pill,.badge,.solve-complete-badge,.lesson-complete-badge){border-radius:8px;font-size:13px;font-weight:550}:-webkit-any(.mock-start-dialog,.ui-dialog){max-height:calc(100dvh - 40px);color:var(--color-text);border:1px solid var(--color-border);background:#fff;border-radius:20px;margin:auto;padding:0;box-shadow:0 24px 80px #1b29422e}:is(.mock-start-dialog,.ui-dialog){max-height:calc(100dvh - 40px);color:var(--color-text);border:1px solid var(--color-border);background:#fff;border-radius:20px;margin:auto;padding:0;box-shadow:0 24px 80px #1b29422e}:-webkit-any(.mock-start-dialog,.ui-dialog)::backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#1b29424d}:is(.mock-start-dialog,.ui-dialog)::backdrop{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#1b29424d}:is(.mock-start-dialog h1,.ui-dialog h2){letter-spacing:-.025em;font-size:24px;font-weight:650;line-height:1.45}:-webkit-any(.mock-start-dialog-body,.ui-dialog-body){padding:28px}:is(.mock-start-dialog-body,.ui-dialog-body){padding:28px}:-webkit-any(.mock-start-description,.ui-dialog-description){color:var(--color-text-2);font-size:16px;line-height:1.75}:is(.mock-start-description,.ui-dialog-description){color:var(--color-text-2);font-size:16px;line-height:1.75}:-webkit-any(.mock-start-description,.account-subtitle,.academy-course-description,.practice-description,.mastery-record-description,.mock-home-copy){word-break:keep-all;overflow-wrap:anywhere}:is(.mock-start-description,.account-subtitle,.academy-course-description,.practice-description,.mastery-record-description,.mock-home-copy){word-break:keep-all;overflow-wrap:anywhere}.ui-dialog{width:min(460px,100vw - 40px)}.ui-dialog h2{margin:0}.ui-dialog-description{white-space:pre-line;word-break:keep-all;margin:12px 0 24px}.ui-dialog-actions{justify-content:flex-end;gap:10px;display:flex}.ui-dialog-actions>button{min-width:100px}.entry-screen{background:#f4f7ff;padding:56px 20px}.entry-card{border-color:#e0e7f2;border-radius:22px;width:min(460px,100%);padding:36px;box-shadow:0 12px 48px #1b294208}.entry-home{margin-bottom:32px;font-size:20px}.entry-card h1{letter-spacing:-.035em;font-size:30px}.account-subtitle{margin:10px 0 24px;font-size:16px;line-height:1.75}.account-tabs{background:var(--color-surface-2);border:0;border-radius:12px;gap:4px;padding:4px}.account-tab{border:0;border-radius:9px;min-height:42px;font-weight:550}.account-tab.is-active{color:var(--color-primary);background:#fff;border:0;box-shadow:0 1px 4px #1b294210}.account-form{gap:20px}.account-field{gap:8px}.account-field label{font-size:14px;font-weight:550}.account-field-hint{color:var(--color-text-3);margin:0;font-size:13px;line-height:1.6}.password-field{position:relative}.password-field input{padding-right:64px}.password-toggle{min-height:36px;color:var(--color-text-2);background:0 0;border:0;border-radius:7px;padding:6px 9px;font-size:13px;position:absolute;top:5px;right:6px}.password-toggle:hover{background:var(--color-surface-2)}.entry-form .btn-primary{min-height:48px}.entry-hint{font-size:13px}.entry-about-link{margin-top:24px;font-weight:500}.lesson:not(.is-solve){border:1px solid var(--color-border);background:#fff;border-radius:18px;max-width:884px;margin:32px auto;padding:28px 36px 20px}.lesson-title{color:var(--color-text)}.lesson-step-heading{letter-spacing:-.035em;font-size:28px}.lesson-step-body.md,.lesson-task.md,.md{font-size:18px;line-height:1.85}.md p{margin-block-start:0;margin-block-end:18px}.md pre{border-color:var(--color-border);background:#f4f7fc;border-radius:12px}.md code{font-size:.88em}.md blockquote{background:var(--color-primary-weak);border-left-color:var(--color-primary);color:var(--color-text-2);border-radius:0 10px 10px 0;padding:12px 18px}.md .md-figure{border-radius:12px}.lesson-step-kicker{border-radius:8px;font-weight:550}.lesson-dot.is-active{box-shadow:0 0 0 4px #3265dc18}.lesson-navbar{gap:12px}.solve-tabbar,.console-bar,.editor-bar{background:#f8faff}.solve-tab,.console-tab{font-weight:550}.solve-tab.is-active,.console-tab.is-active{color:var(--color-primary);border-color:var(--color-primary)}.solve-tabbar{min-height:52px}.solve-title{letter-spacing:-.03em;font-weight:650}.solve-action-bar{background:#fff}.solve-ide .cm-editor,.mock-code-pane .cm-editor{font-size:16px}.cm-gutters{border-right:1px solid var(--color-border)!important;color:var(--color-text-3)!important;background:#f8faff!important}.cm-activeLine,.cm-activeLineGutter{background-color:#edf3ff!important}.cm-blank-hint,.cm-blank-slot{border-radius:5px}.sample-tc-panel{background:#f8faff;border-radius:12px}.tc-cell{border-radius:10px}.guest-code-lock{background:#f4f7fc}.guest-code-overlay{background:#f4f7fce6}.guest-code-icon{color:var(--color-primary);background:#e5edfc;border-radius:14px}.guest-code-overlay h2{font-size:22px}.guest-code-overlay p{word-break:keep-all;max-width:290px;font-size:16px;line-height:1.75}.guest-code-signup{border-radius:8px;align-items:center;min-height:44px;padding-inline-start:12px;padding-inline-end:12px;font-size:14px;font-weight:500;display:inline-flex}@media (max-width:900px){.solve-panel-left,.lesson-solve-left{max-height:none}.solve-tabbody{overflow-y:visible}}@media (max-width:1100px){:root{--header-h:112px}.app-header-inner{grid-template-rows:60px 52px;grid-template-columns:1fr auto;gap:0}.brand-sm{grid-area:1/1;font-size:20px}.app-user{grid-area:1/2}.user-name{display:none}.app-nav{grid-area:2/1/auto/-1;grid-template-columns:repeat(5,minmax(0,1fr));gap:2px;width:100%;display:grid}.nav-link{justify-content:center}}@media (max-width:600px){:root{--control-height:46px}.app-header-inner{padding-inline-start:20px;padding-inline-end:20px}.brand-sm{gap:8px;font-size:18px}.brand-mark{border-radius:10px;flex-basis:32px;width:32px;height:32px;padding:4px}.app-user{gap:6px}.user-avatar{display:none}.app-user .btn-ghost,.app-user .btn-primary{padding:7px 9px;font-size:12px}.nav-link{padding:8px 2px;font-size:13px}.academy-next,.mastery-next{margin-block-start:20px;margin-block-end:24px}.next-problem-link{gap:16px;padding:14px 16px}.next-problem-title{font-size:16px}.page:-webkit-any(.academy-course-page,.practice-page,.mastery-page,.mock-home){padding:28px 20px 48px}.page:is(.academy-course-page,.practice-page,.mastery-page,.mock-home){padding:28px 20px 48px}:is(.academy-course-head h1,.practice-head>h1,.mastery-course-head>h1,.mock-home-title,.page-title){font-size:27px}.entry-screen{align-items:start;padding:28px 20px}.entry-card{border:1px solid var(--color-border);padding:28px 22px}.entry-home{margin-bottom:28px;font-size:18px}.entry-card h1{font-size:27px}.lesson:not(.is-solve){border-radius:14px;margin:20px;padding:20px}.lesson-step-body.md,.lesson-task.md,.md{font-size:17px}.lesson-step-heading{font-size:24px}.lesson-navbar{flex-wrap:wrap}:-webkit-any(.mock-start-dialog-body,.ui-dialog-body){padding:24px 20px}:is(.mock-start-dialog-body,.ui-dialog-body){padding:24px 20px}:is(.mock-start-dialog h1,.ui-dialog h2){font-size:22px}.ui-dialog-actions{grid-template-columns:1fr;display:grid}.ui-dialog-actions>button{width:100%}.solve-action-bar{flex-wrap:wrap;gap:10px}.solve-action-secondary{flex-wrap:wrap;flex:100%}.solve-action-btns{width:100%}.solve-action-btns>button{flex:1;min-width:0}.sample-tc-head{flex-direction:column;align-items:flex-start;gap:4px}.sample-tc-title,.sample-tc-note{word-break:keep-all}}@media (forced-colors:active){.nav-link.active,.account-tab.is-active{outline:1px solid highlight}select{-webkit-appearance:auto!important;appearance:auto!important}}.language-control{border-bottom:1px solid var(--color-border);align-items:stretch;gap:24px;width:100%;margin-top:20px;display:flex}.language-choice{min-width:64px;min-height:48px;color:var(--color-text-2);white-space:nowrap;background:0 0;border:0;border-bottom:2px solid #0000;border-radius:0;flex:none;justify-content:center;align-items:center;margin-bottom:-1px;padding:10px 4px 12px;font-size:16px;font-weight:600;line-height:1.5;display:inline-flex}.language-choice:hover{color:var(--color-primary)}.language-choice[aria-pressed=true]{color:var(--color-primary);border-bottom-color:var(--color-primary)}.language-choice:focus-visible{outline:2px solid var(--color-primary);outline-offset:-4px;border-radius:4px 4px 0 0}@media (forced-colors:active){.language-choice[aria-pressed=true]{color:highlight;border-bottom-color:highlight}}.app-user .user-chip{border-radius:10px;gap:8px;min-width:44px;min-height:44px;padding:4px 8px;text-decoration:none}.app-user .user-chip:hover,.app-user .user-chip[aria-current=page]{background:var(--color-primary-weak)}.app-user .user-chip .user-avatar{width:32px;height:32px;display:inline-flex}.app-user .user-chip:focus-visible{outline:2px solid var(--color-primary);outline-offset:3px}:where(button,a,input,select,textarea,summary,[tabindex]):focus:not(:focus-visible){outline:none}:where(h1,h2,main,section,article)[tabindex="-1"]:focus{outline:none}.cm-content:focus{outline:none}::selection{color:#142137;background:#cbdcff}.answer-success-dialog.answer-success-dialog{text-align:center;border:0;border-radius:24px;width:min(400px,100vw - 32px);padding:32px 28px 20px;animation:.32s cubic-bezier(.2,.8,.2,1) both answer-arrive}.answer-success-art{width:120px;height:120px;color:var(--color-primary);margin:0 auto 20px}.answer-success-art svg{width:100%;height:100%;overflow:visible}.success-halo{fill:var(--color-primary-weak);transform-origin:50%;animation:.65s ease-out both answer-pop}.success-disc{fill:currentColor;transform-origin:50%;animation:.5s cubic-bezier(.2,1.5,.5,1) 80ms both answer-pop}.success-check{stroke:#fff;stroke-width:5px;stroke-linecap:round;stroke-linejoin:round;stroke-dasharray:55;stroke-dashoffset:55px;animation:.35s ease-out .3s forwards answer-check}.success-sparks{stroke:currentColor;stroke-width:3px;stroke-linecap:round;transform-origin:50%;animation:.8s ease-out .15s both answer-sparks}.answer-success-dialog h2{letter-spacing:-.04em;font-size:28px}.answer-success-dialog p{color:var(--color-text-2);margin:10px 0 28px;font-size:15px}.answer-success-actions{gap:8px;display:grid}.answer-success-actions button{justify-content:center;width:100%;min-height:48px}@keyframes answer-arrive{0%{opacity:0;transform:translateY(12px)scale(.96)}to{opacity:1;transform:none}}@keyframes answer-pop{0%{opacity:0;transform:scale(.3)}to{opacity:1;transform:scale(1)}}@keyframes answer-check{to{stroke-dashoffset:0}}@keyframes answer-sparks{0%{opacity:0;transform:scale(.5)}35%{opacity:.65}to{opacity:0;transform:scale(1.12)}}.answer-reward{text-align:left;background:#f5f7fc;border-radius:14px;margin:0 0 24px;padding:18px}.answer-success-dialog .answer-reward-notice{color:var(--color-text-2);margin:0;font-size:13px;line-height:1.6}.answer-success-dialog .answer-reward-notice.has-gain{color:var(--color-primary);letter-spacing:-.03em;font-size:26px;font-weight:650}.answer-reward-heading{font-variant-numeric:tabular-nums;justify-content:space-between;gap:12px;margin:16px 0 8px;font-size:13px;display:flex}.answer-reward-heading>span{color:var(--color-text-2)}.answer-reward-meter{background:#e2e8f3;border-radius:8px;height:8px;overflow:hidden}.answer-reward-meter>span{background:var(--color-primary);border-radius:inherit;height:100%;display:block}.answer-reward-remaining,.answer-reward-bonus{color:var(--color-text-2);font-size:12px;line-height:1.6;display:block}.answer-reward-remaining{margin-top:8px}.answer-success-dialog.is-level-up .success-halo{animation:.7s ease-out both answer-pop}.answer-success-dialog.is-level-up h2{color:var(--color-primary);font-size:25px}.answer-success-dialog:has(.answer-reward) .answer-success-art{width:88px;height:88px;margin-bottom:12px}.answer-success-dialog:has(.answer-reward)>p{margin-bottom:20px}@media (max-width:400px){.app-nav .nav-link{white-space:nowrap;font-size:12px}}
