@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Manrope:wght@500;600;700&family=JetBrains+Mono:wght@400;500&display=swap";@import "https://fonts.googleapis.com/css2?family=Noto+Serif+Armenian:ital,wght@0,400;0,600;0,700;1,400&display=swap";:root{--text:#52525b;--text-h:#18181b;--bg:#fff;--page-bg:#f5f5f5;--surface:#fff;--border:#e4e4e7;--border-hover:#a1a1aa;--border-input:var(--border);--code-bg:#f4f4f5;--accent:oklch(71.7% .1648 250.794);--accent-bg:oklch(95% .04 250.794);--accent-border:oklch(71.7% .1648 250.794);--accent-support:#0d9488;--success:#16a34a;--warning:#d97706;--error:#dc2626;--info:#0284c7;--social-bg:#f4f4f599;--surface-hover:#ebebeb;--btn-bg:#18181b;--btn-fg:#fafafa;--btn-bg-hover:#3f3f46;--btn-bg-active:#27272a;--text-muted:#71717a;--text-m:#000000a6;--surface-2:#0000000a;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:24px;--space-6:32px;--radius-sm:6px;--radius-md:8px;--shadow:#0000001a 0 10px 15px -3px, #0000000d 0 4px 6px -2px;--sans:"Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;--heading:"Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;--mono:"JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;font:18px/145% var(--sans);letter-spacing:.18px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;color:var(--text);background:var(--page-bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (width<=1024px){:root{font-size:16px}}[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--text:#888;--text-h:#ededed;--bg:#0a0a0a;--page-bg:#000;--surface:#111;--border:#1a1a1a;--border-hover:#3f3f46;--border-input:color-mix(in oklab, var(--border-hover) 70%, var(--border));--code-bg:#111;--accent:oklch(75% .1648 250.794);--accent-bg:oklch(18% .065 250.794);--accent-border:oklch(75% 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var(--border);border-radius:var(--radius-md);background:var(--surface);width:100%;box-shadow:var(--shadow);text-align:left;gap:.85rem;margin:0 auto;padding:1rem 1.25rem;display:grid}.page-header{justify-content:space-between;align-items:flex-start;gap:var(--space-3);font-size:14px;display:flex}@media (width<=640px){.page-header{flex-direction:column}}.page-header__title{letter-spacing:-.02em;color:var(--text-h);margin:0 0 4px;font-size:1.125rem;font-weight:700}.page-header__desc{color:var(--text);margin:0;font-size:.875rem}.page-shell{width:100%;padding:var(--space-4);gap:var(--space-5);box-shadow:none;text-align:left;background:0 0;border:none;border-radius:0;margin:1rem auto;display:grid}.page-shell--narrow{max-width:760px}.page-shell--wide{max-width:560px}@media (width>=768px){main,.page-shell{margin:0 auto;padding:1.75rem}}.student-app-shell{--student-app-header-height:3.5rem;--student-app-content-max:min(56rem, 100%);box-sizing:border-box;width:100%;min-width:0;min-height:100vh;color:var(--text);background:var(--page-bg)}.student-skip-link{z-index:200;color:#f8fafc;border-radius:var(--radius-sm);background:linear-gradient(135deg,#0f766e,#059669);padding:.5rem .85rem;font-weight:600;text-decoration:none;position:absolute;top:0;left:-9999px}.student-skip-link:focus{left:max(1rem, env(safe-area-inset-left));top:calc(.5rem + env(safe-area-inset-top));outline:2px solid var(--accent);outline-offset:2px}.student-app-header{z-index:100;min-height:var(--student-app-header-height);padding-top:env(safe-area-inset-top);padding-left:max(.75rem, env(safe-area-inset-left,0px));padding-right:max(.75rem, env(safe-area-inset-right,0px));border-bottom:1px solid var(--border);background:var(--page-bg);box-sizing:border-box;position:fixed;top:0;left:0;right:0}.student-app-header__inner{max-width:var(--student-app-content-max);padding:.45rem var(--space-4);justify-content:space-between;align-items:center;gap:var(--space-2) var(--space-3);flex-wrap:wrap;margin:0 auto;display:flex}.visually-hidden{clip:rect(0, 0, 0, 0);clip-path:inset(50%);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.student-app-header__logo-link{background:var(--code-bg);border:1px solid var(--border);border-radius:14px;flex-shrink:0;justify-content:center;align-items:center;padding:5px;line-height:0;text-decoration:none;display:inline-flex}.student-app-header__logo-link:hover{background:var(--surface-2,var(--code-bg));border-color:var(--border-hover);text-decoration:none}.student-app-header__logo-link:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.student-app-header__logo{border-radius:10px;width:38px;height:38px;display:block}.student-app-header__nav{align-items:center;gap:var(--space-2) var(--space-3);flex-wrap:wrap;flex:1;justify-content:flex-end;display:flex}.student-app-header__secondary--desktop{align-items:center;gap:.25rem var(--space-3);flex-wrap:wrap;display:none}.student-app-header__secondary--narrow{align-items:center;display:flex;position:relative}.student-app-header__menu-trigger{background:var(--code-bg);border:1px solid var(--border);cursor:pointer;min-height:36px;font:inherit;color:var(--text-h);border-radius:6px;padding:0 12px;font-size:14px;font-weight:500;transition:background .12s,border-color .12s}.theme-toggle{box-sizing:border-box;border:1px solid var(--border);width:40px;height:40px;min-height:40px;color:var(--text-h);cursor:pointer;background:0 0;border-radius:10px;flex-shrink:0;justify-content:center;align-items:center;padding:0;transition:background .15s,border-color .15s,color .15s;display:inline-flex}.theme-toggle:hover{background:var(--code-bg);border-color:var(--border);color:var(--text-h)}.theme-toggle:focus-visible{outline:2px solid 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.student-app-header__link:hover{color:var(--text-h);text-decoration:none}.student-app-header__secondary--desktop .student-app-header__link--active{color:var(--text-h);font-weight:600}.student-app-header__menu-panel .student-app-header__link{color:var(--text-h);text-decoration:none}.student-app-header__menu-panel .student-app-header__link:hover{color:var(--text-h);background:var(--code-bg);text-decoration:none}.student-app-header__menu-panel .student-app-header__link--active{color:var(--accent);background:var(--accent-bg);font-weight:600}.student-app-header__menu-backdrop{z-index:90;background:color-mix(in oklab, var(--bg) 50%, transparent);cursor:pointer;border:none;margin:0;padding:0;position:fixed;inset:0}.student-app-header__link{padding:.2rem 0;font-size:.875rem;font-weight:500;text-decoration:none}.student-app-header__link--btn{font:inherit;cursor:pointer;text-align:start;min-height:unset;background:0 0;border:none;padding:.2rem 0}@media 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var(--space-3);max-width:52ch;color:var(--text);opacity:.88;font-size:.9375rem;line-height:1.55}.student-test-new__cta-wide{box-sizing:border-box;text-align:center;justify-content:center;width:100%;max-width:none}.student-test-new__form{gap:var(--space-2);display:grid}.student-test-new__label{color:var(--text-h);font-size:.9375rem;font-weight:600}.student-test-new__input{max-width:8rem}.student-test-new__hint{color:var(--text);opacity:.78;margin:0;font-size:.8125rem}.student-test-new__start{margin-top:var(--space-2);cursor:pointer;font:inherit}.student-test-new__more-tests{margin-top:var(--space-2)}.student-test-new__start:disabled{opacity:.72;cursor:not-allowed;filter:none;transform:none}.student-test-new__start:disabled:hover{filter:none;transform:none}.student-dashboard__stack{flex-direction:column;gap:2.5rem;display:flex}.student-dashboard__attempt-list{margin:0;padding:0;list-style:none}.student-dashboard__attempt-row{border-bottom:1px solid 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.55rem}.student-dashboard__badge--ongoing{letter-spacing:.02em;color:var(--accent);background:var(--accent-bg);border:1px solid var(--accent-border);white-space:nowrap;border-radius:999px;padding:.18rem .5rem;font-size:.75rem;font-weight:600}.student-dashboard__footer-link{margin:var(--space-3) 0 0;font-size:.9375rem}.student-dashboard__footer-link--tight{margin-top:var(--space-2)}.student-dashboard__analytics-embed{margin:0}.student-dashboard__analytics-embed-hint{margin:0 0 var(--space-2);color:var(--text-muted,#57534e);font-size:.875rem;line-height:1.4}.student-dashboard__analytics-embed-summary{margin-top:0}.student-dashboard__analytics-embed-range{margin-bottom:var(--space-3)}.student-insights__filters{padding:var(--space-3) var(--space-4);border-radius:var(--radius-md);border:1px solid 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var(--surface))}.student-insights__hierarchy-cell--kind .student-insights__hierarchy-cell__rect{fill:color-mix(in oklab, var(--error) 42%, var(--surface))}.student-insights__hierarchy-cell__label{fill:var(--text-h);pointer-events:none;font-size:.6875rem;font-weight:500}.student-insights__hierarchy-cell__count{fill:var(--text-h);pointer-events:none;font-size:.8125rem;font-weight:700}.student-insights__small-multiples{gap:var(--space-4);grid-template-columns:repeat(auto-fill,minmax(min(100%,16rem),1fr));display:grid}.student-insights__small-multiple{gap:var(--space-2);padding:var(--space-3);border:1px solid 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var(--space-3);font-size:1.125rem}.auth-role-choice{gap:var(--space-6)}.auth-role-choice__option{gap:var(--space-3);display:grid}.auth-role-choice__option h2{margin:0}.auth-callback__logout-link{margin-top:var(--space-4);text-align:right}.auth-callback__brand{margin:0 0 var(--space-3)}.auth-callback__brand a{align-items:center;display:inline-flex}@media (width>=860px){.auth-signin{grid-template-columns:1fr 1.15fr;gap:0}}@media (width<=859px){.auth-signin{min-height:auto}.auth-signin__hero{display:none}.auth-signin__mobile-logo{display:block}}code,.counter{font-family:var(--mono);color:var(--text-h);border-radius:4px;display:inline-flex}code{background:var(--code-bg);padding:4px 8px;font-size:15px;line-height:135%}.test-take-main.page-shell--wide{text-align:left;justify-items:stretch;width:100%;max-width:min(56rem,100%)}.test-page-inner{--test-sheet-action-size:40px;--test-sheet-action-inset:9px;max-width:min(48rem,100%);padding:var(--space-5) 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oklab, var(--warning) 35%, var(--border));border-inline-start:4px solid var(--warning);border-radius:var(--radius-sm);background:color-mix(in oklab, var(--warning) 8%, var(--surface));color:var(--text-h)}.test-submit-confirm-warning__mast{align-items:flex-start;gap:var(--space-2);margin-bottom:var(--space-2);display:flex}.test-submit-confirm-warning__icon{color:var(--warning);flex-shrink:0;margin-top:1px;display:inline-flex}.test-submit-confirm-warning__icon svg{width:1.25rem;height:1.25rem}.test-submit-confirm-warning__heading{letter-spacing:.02em;text-transform:uppercase;color:var(--warning);margin:0;font-size:.875rem;font-weight:700;line-height:1.35}.test-submit-confirm-warning__body{color:var(--text);margin:0;padding-inline-start:calc(1.25rem + var(--space-2));font-size:.9375rem;font-weight:500;line-height:1.45}.test-review-no-answer{box-sizing:border-box;width:var(--test-sheet-action-size);height:var(--test-sheet-action-size);padding:0 var(--test-sheet-action-inset) 0 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0;border:none;flex-shrink:0;justify-content:flex-end;align-self:flex-start;align-items:center;display:inline-flex}.test-exercise-feedback-btn__icon{width:22px;height:22px}.test-exercise-feedback-btn:hover{opacity:1}.test-exercise-feedback-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}.test-exercise-feedback-btn__icon--thanks{color:var(--success,#16a34a)}.test-feedback-dialog-hint{font-family:var(--sans);color:var(--text);margin:0 0 12px;font-size:14px;line-height:1.55}.test-feedback-form__scope{margin-bottom:var(--space-4)}.test-sheet-section-range,.test-sheet-section-title{font-weight:700}.test-question-blocks{flex-direction:column;gap:4.25rem;display:flex}.test-question-block{margin:0}.test-question-fieldset{border:none;min-width:0;margin:0;padding:0}.test-question-grid{column-gap:var(--space-3);row-gap:var(--space-3);margin:0 0 var(--space-3);text-align:left;grid-template-columns:auto 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var(--accent);outline-offset:2px}.test-question-na-full-span{grid-area:2/1/auto/-1;margin:0}.test-question-num-box{box-sizing:border-box;font-variant-numeric:tabular-nums;border:1px solid #0a0a0a;flex-shrink:0;justify-content:center;align-items:center;width:5ch;min-height:0;padding-block:1px;padding-inline:0;font-weight:400;line-height:1.15;display:inline-flex}.test-question-prompt{margin:0;font-weight:400}span.katex-text-root.test-question-prompt,span.katex-text-root.test-exercise-statement{display:block}.katex-text-root .katex{font-size:inherit}.katex-text-root .katex-display{margin:.5em 0}.test-sheet-section-title .katex{color:inherit;font-weight:700}.test-choice-prefix{font-weight:400}.test-choice-katex.katex-text-root{display:inline}.test-choice-list{flex-direction:column;gap:5px;margin:0;padding:0;list-style:none;display:flex}.test-choice--sheet{box-sizing:border-box;width:100%;min-width:0;padding:1px var(--space-2);cursor:pointer;color:inherit;border:1px solid #0000;border-radius:4px;align-items:center;gap:.6rem;margin:0;font-weight:400;display:flex}.test-page-inner .test-choice--sheet{color:#0a0a0a;font-weight:400}.test-choice-input{width:1.125rem;height:1.125rem;accent-color:var(--accent);cursor:pointer;flex-shrink:0;margin:0}.test-choice-text{text-align:left;flex:1;min-width:0}.test-choice--sheet:has(.test-choice-input:focus-visible){outline:2px solid var(--accent);outline-offset:2px}.test-choice--sheet:has(.test-choice-input:checked){background:var(--accent-bg);border-color:var(--accent-border)}.test-page-inner .test-choice--sheet .test-choice-text{font-weight:400}.test-statement-btn-group{flex-direction:column;gap:5px;display:flex}.test-statement-radio-label{box-sizing:border-box;width:100%;min-width:0;padding:1px var(--space-2);cursor:pointer;color:#0a0a0a;border:1px solid #0000;border-radius:4px;align-items:center;gap:.6rem;margin:0;font-weight:400;display:flex}.test-statement-radio{accent-color:#1d4ed8;cursor:pointer;flex-shrink:0;width:1.125rem;height:1.125rem;margin:0}.test-statement-radio-label:has(.test-statement-radio:focus-visible){outline-offset:2px;outline:2px solid #2563eb}.test-statement-radio-label:has(.test-statement-radio:checked){background:#1d4ed81a;border-color:#1d4ed859}.test-submit-btn{font-family:var(--sans);letter-spacing:-.01em;padding:0 var(--space-4);border:1px solid var(--btn-bg);border-radius:var(--radius-sm);background:var(--btn-bg);height:36px;color:var(--btn-fg);cursor:pointer;font-size:14px;font-weight:500;transition:background .12s,border-color .12s}.test-submit-btn:hover:not(:disabled){background:var(--btn-bg-hover);border-color:var(--btn-bg-hover)}.test-submit-btn:disabled{opacity:.38;cursor:not-allowed}.test-sheet-footer-link{margin:var(--space-4) 0 0;font-size:.875rem}.test-page-inner a{color:var(--accent)}.test-exercise-block{margin-bottom:var(--space-6);max-width:48rem;margin-left:auto;margin-right:auto}.test-page-inner .test-exercise-block{text-align:left;align-self:stretch;width:100%;max-width:none;margin-left:0;margin-right:0}.test-exercise-block.test-exercise-block--sheet{margin-bottom:5.5rem}.test-exercise-statement{white-space:pre-wrap;text-align:left;margin-bottom:var(--space-4);padding:var(--space-3) var(--space-4);background:var(--surface-2,#0000000a);border-radius:8px;line-height:1.45}.test-item-list{text-align:left;padding-left:var(--space-5);max-width:40rem;margin:var(--space-4) auto;list-style:decimal}.test-item{margin-bottom:var(--space-5)}.test-choice{gap:var(--space-2);margin:var(--space-2) 0;text-align:left;align-items:flex-start;display:flex}.test-choice.test-choice--sheet{align-items:center;margin-block:0;margin-inline:0}.test-choice.test-choice--sheet.test-choice-review{cursor:default;flex-wrap:nowrap;width:100%;margin-block:0;margin-inline:0}.test-page-inner .test-choice.test-choice--sheet.test-choice-review{font-weight:400}.test-choice.test-choice--sheet.test-choice-review.test-choice-review--neutral{background:0 0;border-color:#0000}.test-page-inner .test-attempt-review{margin-top:var(--space-4)}.test-score-summary{margin-bottom:var(--space-5)}.test-score-summary__card{justify-content:center;align-items:center;gap:var(--space-3);padding:var(--space-4) var(--space-5);border-radius:var(--radius-sm);border:1px solid var(--accent-border);background:var(--accent-bg);color:var(--accent);text-align:center;flex-wrap:wrap;font-size:.9375rem;display:flex}.test-score-summary__score20{letter-spacing:-.02em;flex-shrink:0;font-size:1.5rem;font-weight:700}.test-score-summary__detail{color:inherit;opacity:.85}.test-review-answer-line{align-items:center;gap:var(--space-2);margin:0 0 var(--space-1);font-size:.9375rem;display:flex}.test-review-answer-label{color:var(--text-h);flex-shrink:0;font-weight:600}.test-review-value--correct{color:var(--success);font-weight:600}.test-review-value--wrong{color:var(--error);font-weight:600}.test-review-value--neutral{color:var(--text);font-weight:500}.test-item-review-na{color:var(--text);font-size:.9375rem}.test-take-meta{max-width:48rem;margin:0 auto var(--space-3);text-align:center;color:var(--text-m,#000000a6);font-size:.95rem;line-height:1.45}.test-save-status{max-width:48rem;margin:0 auto 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