:root{--primitive-white: #ffffff;--primitive-gray-50: #f8f9fc;--primitive-gray-100: #f4f5f7;--primitive-gray-200: #ebeef2;--primitive-gray-300: #dce1e9;--primitive-gray-500: #6b7280;--primitive-gray-700: #374151;--primitive-gray-900: #1f2937;--primitive-purple-50: #f3f0ff;--primitive-purple-100: #ede9fe;--primitive-purple-500: #7c5cfc;--primitive-purple-600: #6d4ef0;--primitive-blue-500: #3b82f6;--primitive-teal-500: #10b981;--primitive-amber-500: #f59e0b;--primitive-red-500: #ef4444;--color-bg: var(--primitive-gray-100);--color-surface: var(--primitive-white);--color-surface-2: var(--primitive-gray-50);--color-border: var(--primitive-gray-200);--color-border-strong: var(--primitive-gray-300);--color-ink: var(--primitive-gray-900);--color-muted: var(--primitive-gray-500);--color-ink-secondary: var(--primitive-gray-700);--color-primary: var(--primitive-purple-500);--color-primary-hover: var(--primitive-purple-600);--color-primary-dim: color-mix(in srgb, var(--color-primary) 12%, transparent);--color-primary-muted: var(--primitive-purple-100);--color-success: var(--primitive-teal-500);--color-success-dim: color-mix(in srgb, var(--color-success) 12%, transparent);--color-warning: var(--primitive-amber-500);--color-warning-dim: color-mix(in srgb, var(--color-warning) 14%, transparent);--color-danger: var(--primitive-red-500);--color-danger-dim: color-mix(in srgb, var(--color-danger) 12%, transparent);--color-ch1: var(--primitive-blue-500);--color-ch1-dim: color-mix(in srgb, var(--color-ch1) 12%, transparent);--color-ch2: var(--primitive-purple-500);--color-ch2-dim: var(--color-primary-dim);--color-ch3: var(--primitive-teal-500);--color-ch3-dim: color-mix(in srgb, var(--color-ch3) 12%, transparent);--color-ch4: var(--primitive-amber-500);--color-ch4-dim: color-mix(in srgb, var(--color-ch4) 14%, transparent);--radius-sm: 8px;--radius-md: 10px;--radius-lg: 12px;--radius-xl: 16px;--radius-pill: 9999px;--shadow-card: 0 1px 3px rgba(15, 23, 42, .06), 0 1px 2px rgba(15, 23, 42, .04);--shadow-card-hover: 0 4px 14px rgba(15, 23, 42, .08);--shadow-sidebar: 1px 0 0 var(--color-border);--sidebar-width: 15rem;--gradient-brand: linear-gradient( 90deg, var(--color-ch1) 0%, var(--color-primary) 50%, var(--color-ch3) 100% );--gradient-chapter-hero: radial-gradient( ellipse 80% 50% at 90% -10%, var(--ch-glow), transparent 60% );--ch-accent: var(--color-ch1);--ch-dim: var(--color-ch1-dim);--ch-glow: color-mix(in srgb, var(--color-ch1) 14%, transparent);--worksheet-bg: var(--primitive-white);--worksheet-panel: var(--primitive-gray-50);--worksheet-border: var(--primitive-gray-200);--worksheet-border-strong: var(--primitive-gray-300);--worksheet-ink: var(--primitive-gray-900);--worksheet-muted: var(--primitive-gray-700);--worksheet-hint: var(--primitive-gray-500);--worksheet-input-bg: var(--primitive-white);--worksheet-row-alt: color-mix(in srgb, var(--primitive-gray-50) 80%, transparent);--worksheet-row-label: color-mix(in srgb, var(--primitive-gray-50) 90%, transparent);--worksheet-header-from: var(--color-ch1);--worksheet-header-to: #1d4ed8;--worksheet-table-th-summary: linear-gradient( 135deg, #5b9fd4 0%, #6b8fd4 50%, #8b7fd4 100% );--worksheet-table-th-eval-main: #1e40af;--worksheet-table-th-eval-blog: linear-gradient(180deg, #7eb8e8 0%, #a8b8e8 100%);--worksheet-on-accent: var(--primitive-white);--worksheet-eval-hover: color-mix(in srgb, var(--color-ch1) 8%, transparent);--overlay-backdrop: rgba(15, 23, 42, .72);--overlay-ink: var(--primitive-white);--overlay-muted: #d1d5db;--overlay-btn-border: rgba(255, 255, 255, .2);--overlay-btn-bg: rgba(255, 255, 255, .1);--overlay-btn-bg-hover: rgba(255, 255, 255, .2)}[data-theme=dark]{--color-bg: #0f1419;--color-surface: #1a2332;--color-surface-2: #151d2b;--color-border: #2d3a4d;--color-border-strong: #3d4f66;--color-ink: #f1f5f9;--color-muted: #94a3b8;--color-ink-secondary: #cbd5e1;--color-primary: #8b7cf8;--color-primary-hover: #9d8ffa;--color-primary-dim: color-mix(in srgb, var(--color-primary) 18%, transparent);--color-primary-muted: color-mix(in srgb, var(--color-primary) 22%, #1a2332);--shadow-card: 0 1px 3px rgba(0, 0, 0, .35), 0 1px 2px rgba(0, 0, 0, .25);--shadow-card-hover: 0 4px 14px rgba(0, 0, 0, .45);--shadow-sidebar: 1px 0 0 var(--color-border);--worksheet-bg: #1e293b;--worksheet-panel: #0f172a;--worksheet-border: #334155;--worksheet-border-strong: #475569;--worksheet-ink: #f1f5f9;--worksheet-muted: #cbd5e1;--worksheet-hint: #94a3b8;--worksheet-input-bg: #1e293b;--worksheet-row-alt: color-mix(in srgb, #0f172a 80%, transparent);--worksheet-row-label: color-mix(in srgb, #0f172a 90%, transparent);--worksheet-header-from: #2563eb;--worksheet-header-to: #1e3a8a;--worksheet-table-th-summary: linear-gradient( 135deg, #1e4a6e 0%, #2d4a7a 50%, #3d3d6e 100% );--worksheet-table-th-eval-main: #1e3a6e;--worksheet-table-th-eval-blog: linear-gradient(180deg, #2d5a8a 0%, #3d4a7a 100%);--overlay-backdrop: rgba(0, 0, 0, .78)}.theme-ch1{--ch-accent: var(--color-ch1);--ch-dim: var(--color-ch1-dim);--ch-glow: color-mix(in srgb, var(--color-ch1) 14%, transparent)}.theme-ch2{--ch-accent: var(--color-ch2);--ch-dim: var(--color-ch2-dim);--ch-glow: color-mix(in srgb, var(--color-ch2) 14%, transparent)}.theme-ch3{--ch-accent: var(--color-ch3);--ch-dim: var(--color-ch3-dim);--ch-glow: color-mix(in srgb, var(--color-ch3) 14%, transparent)}.theme-ch4{--ch-accent: var(--color-ch4);--ch-dim: var(--color-ch4-dim);--ch-glow: color-mix(in srgb, var(--color-ch4) 14%, transparent)}.app-shell{display:flex;min-height:100vh;color:var(--color-ink)}.app-sidebar{position:fixed;top:0;bottom:0;left:0;z-index:50;display:flex;height:100vh;width:min(100vw,var(--sidebar-width));--tw-translate-x: -100%;transform:translate(var(--tw-translate-x),var(--tw-translate-y)) rotate(var(--tw-rotate)) skew(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y));flex-direction:column;transition-property:transform;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.2s;transition-timing-function:cubic-bezier(0,0,.2,1)}@media (min-width: 768px){.app-sidebar{position:sticky;top:0;z-index:auto;--tw-translate-x: 0px;transform:translate(var(--tw-translate-x),var(--tw-translate-y)) rotate(var(--tw-rotate)) skew(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}}@media print{.app-sidebar{display:none}}.app-sidebar{background:var(--color-surface);box-shadow:var(--shadow-sidebar)}.app-sidebar--open{--tw-translate-x: 0px;transform:translate(var(--tw-translate-x),var(--tw-translate-y)) rotate(var(--tw-rotate)) skew(var(--tw-skew-x)) skewY(var(--tw-skew-y)) scaleX(var(--tw-scale-x)) scaleY(var(--tw-scale-y))}.app-sidebar-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;z-index:40;background-color:#00000073}@media (min-width: 768px){.app-sidebar-backdrop{display:none}}@media print{.app-sidebar-backdrop{display:none}}.sidebar-menu-btn{display:flex;height:2.5rem;width:2.5rem;flex-shrink:0;align-items:center;justify-content:center;border-radius:var(--radius-md);border-width:1px;border-color:var(--color-border);color:var(--color-ink);transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s;background:var(--color-surface-2)}.sidebar-menu-btn:hover{border-color:color-mix(in srgb,var(--color-primary) 40%,var(--color-border));color:var(--color-primary)}.sidebar-close-btn{display:flex;height:2.25rem;width:2.25rem;flex-shrink:0;align-items:center;justify-content:center;border-radius:var(--radius-md);color:var(--color-muted);transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s}.sidebar-close-btn:hover{background-color:var(--color-surface-2);color:var(--color-ink)}.app-sidebar__brand{border-bottom-width:1px;border-color:var(--color-border);padding:1.25rem}.app-sidebar__nav{display:flex;flex:1 1 0%;flex-direction:column;gap:.125rem;overflow-y:auto;padding:.75rem}.app-sidebar__footer{border-top-width:1px;border-color:var(--color-border);padding:1rem;font-size:.75rem;line-height:1rem;color:var(--color-muted)}.app-main{min-height:100vh;flex:1 1 0%}.app-topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:.5rem;border-bottom-width:1px;border-color:var(--color-border);padding:.75rem 1rem}@media (min-width: 768px){.app-topbar{display:none}}@media print{.app-topbar{display:none}}.app-topbar{background:var(--color-surface);box-shadow:var(--shadow-card)}.app-content{margin-left:auto;margin-right:auto;max-width:64rem;padding:1.5rem 1rem 4rem}@media (min-width: 768px){.app-content{padding-left:2rem;padding-right:2rem;padding-top:2rem}}@media (min-width: 1024px){.app-content{padding-left:2.5rem;padding-right:2.5rem}}.teacher-shell{display:flex;min-height:100vh;color:var(--color-ink);background:var(--color-bg)}.teacher-sidebar{--sidebar-width: 16.5rem;box-shadow:1px 0 0 var(--color-border),12px 0 28px #0f172a0a}.teacher-brand-mark{display:flex;height:2.75rem;width:2.75rem;flex-shrink:0;align-items:center;justify-content:center;--tw-text-opacity: 1;color:rgb(255 255 255 / var(--tw-text-opacity, 1));border-radius:var(--radius-lg);background:var(--gradient-brand);box-shadow:var(--shadow-card)}.teacher-sidebar__nav-link{min-height:3rem;font-weight:500}.teacher-main{display:flex;min-height:100vh;min-width:0px;flex:1 1 0%;flex-direction:column}.teacher-topbar{position:sticky;top:.75rem;z-index:30;margin-left:.75rem;margin-right:.75rem;margin-top:.75rem;display:flex;min-height:4.25rem;align-items:center;gap:.75rem;border-radius:var(--radius-lg);border-width:1px;border-color:var(--color-border);padding:.75rem 1rem}@media (min-width: 768px){.teacher-topbar{top:1.25rem;margin-left:1.25rem;margin-right:1.25rem;margin-top:1.25rem;padding-left:1.25rem;padding-right:1.25rem}}@media (min-width: 1024px){.teacher-topbar{margin-left:2rem;margin-right:2rem;padding-left:1.5rem;padding-right:1.5rem}}@media print{.teacher-topbar{display:none}}.teacher-topbar{background:color-mix(in srgb,var(--color-surface) 94%,transparent);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);box-shadow:0 10px 28px #0f172a14}.teacher-topbar-mark{display:none;height:2.75rem;width:2.75rem;flex-shrink:0;align-items:center;justify-content:center;--tw-text-opacity: 1;color:rgb(255 255 255 / var(--tw-text-opacity, 1))}@media (min-width: 640px){.teacher-topbar-mark{display:flex}}.teacher-topbar-mark{border-radius:var(--radius-pill);background:var(--gradient-brand);box-shadow:var(--shadow-card)}.teacher-content{width:100%;flex:1 1 0%;padding:1.25rem 1rem 4rem}@media (min-width: 768px){.teacher-content{padding-left:1.25rem;padding-right:1.25rem;padding-top:1.5rem}}@media (min-width: 1024px){.teacher-content{padding-left:2rem;padding-right:2rem}}.teacher-review-table thead th{position:sticky;top:0;z-index:10;background:color-mix(in srgb,var(--color-surface-2) 92%,transparent);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.teacher-review-table tbody tr:hover{background:color-mix(in srgb,var(--color-surface-2) 45%,transparent)}.classroom-chip{display:inline-flex;max-width:7.5rem;align-items:center;justify-content:center;border-radius:var(--radius-pill);border-width:1px;padding:.25rem .625rem;text-align:center;font-size:.75rem;line-height:1rem;font-weight:600;line-height:1.25;color:var(--color-ink);background:color-mix(in srgb,var(--color-primary) 12%,var(--color-surface-2));border-color:color-mix(in srgb,var(--color-primary) 28%,var(--color-border))}.icon-tooltip-btn{position:relative;display:inline-flex;height:2.25rem;width:2.25rem;flex-shrink:0;align-items:center;justify-content:center;border-radius:var(--radius-md);border-width:1px;border-color:var(--color-border);color:var(--color-muted);transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s}.icon-tooltip-btn:disabled{cursor:not-allowed;opacity:.5}.icon-tooltip-btn{background:var(--color-surface-2)}.icon-tooltip-btn:hover:not(:disabled){border-color:color-mix(in srgb,var(--color-primary) 40%,var(--color-border));color:var(--color-primary)}.icon-tooltip-btn--danger:hover:not(:disabled){border-color:color-mix(in srgb,var(--color-danger) 45%,var(--color-border));color:var(--color-danger);background:color-mix(in srgb,var(--color-danger) 8%,var(--color-surface-2))}.icon-tooltip-btn:after{content:attr(data-tooltip);position:absolute;bottom:calc(100% + .4rem);left:50%;z-index:30;pointer-events:none;white-space:nowrap;border-radius:var(--radius-sm);border:1px solid var(--color-border);background:var(--color-surface);padding:.25rem .5rem;font-size:.6875rem;font-weight:500;color:var(--color-ink);opacity:0;transform:translate(-50%) translateY(2px);transition:opacity .15s ease,transform .15s ease;box-shadow:var(--shadow-card)}.icon-tooltip-btn:hover:after,.icon-tooltip-btn:focus-visible:after{opacity:1;transform:translate(-50%) translateY(0)}.teacher-search{display:none;height:2.75rem;min-width:0px;align-items:center;gap:.5rem;border-radius:var(--radius-md);border-width:1px;border-color:var(--color-border);padding-left:.75rem;padding-right:.75rem}@media (min-width: 1024px){.teacher-search{display:flex;width:16rem}}.teacher-search{background:var(--color-surface-2)}.teacher-icon-btn{display:none;height:2.75rem;width:2.75rem;flex-shrink:0;align-items:center;justify-content:center;border-radius:var(--radius-md);border-width:1px;border-color:var(--color-border);color:var(--color-muted);transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s}@media (min-width: 640px){.teacher-icon-btn{display:flex}}.teacher-icon-btn{background:var(--color-surface-2)}.teacher-icon-btn:hover{border-color:color-mix(in srgb,var(--color-primary) 40%,var(--color-border));color:var(--color-primary)}.sidebar-nav__section{padding:1rem .75rem .25rem;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace;font-size:9px;text-transform:uppercase;letter-spacing:.14em;color:var(--color-muted)}.sidebar-nav__item{display:flex;align-items:center;gap:.75rem;border-radius:var(--radius-md);padding:.625rem .75rem;font-size:.875rem;line-height:1.25rem;color:var(--color-muted);transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s}.sidebar-nav__item:hover{background:var(--color-surface-2);color:var(--color-ink)}.sidebar-nav__item--active{background:var(--color-primary-dim);color:var(--color-primary);font-weight:500}.sidebar-nav__item--active:hover{background:var(--color-primary-dim);color:var(--color-primary)}.page-eyebrow{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace;font-size:10px;text-transform:uppercase;letter-spacing:.14em;color:var(--color-muted)}.page-title{font-size:1.5rem;line-height:2rem;font-weight:600;color:var(--color-ink)}@media (min-width: 768px){.page-title{font-size:1.875rem;line-height:2.25rem}}.page-lead{margin-top:.5rem;max-width:42rem;font-size:.875rem;line-height:1.25rem;color:var(--color-muted)}@media (min-width: 768px){.page-lead{font-size:1rem;line-height:1.5rem}}.brand-accent-line{margin-top:.75rem;height:.25rem;width:7rem;border-radius:var(--radius-pill);background:var(--gradient-brand)}.chapter-hero-glow{pointer-events:none;position:absolute;left:0;right:0;top:0;height:10rem;background:var(--gradient-chapter-hero)}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card)}.card--padded,.card--padded-lg{padding:1.5rem}@media (min-width: 768px){.card--padded-lg{padding:2rem}}.chapter-card{display:block;padding:1.25rem;transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card)}.chapter-card:hover{border-color:var(--ch-accent);box-shadow:var(--shadow-card-hover);transform:translateY(-2px)}.chapter-card__badge{border-radius:var(--radius-sm);border-width:1px;border-color:var(--color-border);padding:.25rem .5rem;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,Liberation Mono,Courier New,monospace;font-size:10px;color:var(--color-muted);transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s}.chapter-card:hover .chapter-card__badge{border-color:var(--ch-accent);color:var(--ch-accent)}.subject-card{display:block;padding:1.5rem;transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter,backdrop-filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-card)}.subject-card:hover{border-color:var(--color-primary);box-shadow:var(--shadow-card-hover);transform:translateY(-2px)}.subject-card__icon{display:flex;height:3rem;width:3rem;flex-shrink:0;align-items:center;justify-content:center;font-size:.875rem;line-height:1.25rem;font-weight:700;--tw-text-opacity: 1;color:rgb(255 255 255 / var(--tw-text-opacity, 1));border-radius:var(--radius-lg)}.landing-page{position:relative;min-height:100vh}.landing-page__glow{pointer-events:none;position:absolute;left:0;right:0;top:0;height:min(52vh,28rem);background:radial-gradient(ellipse 75% 55% at 88% 8%,var(--color-primary-dim),transparent 62%)}.landing-header{position:sticky;top:0;z-index:50;border-bottom-width:1px;border-color:var(--color-border)}@media print{.landing-header{display:none}}.landing-header{background:color-mix(in srgb,var(--color-surface) 88%,transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.landing-header__inner{margin-left:auto;margin-right:auto;display:flex;max-width:72rem;align-items:center;justify-content:space-between;gap:1rem;padding:.75rem 1rem}@media (min-width: 768px){.landing-header__inner{padding-left:2rem;padding-right:2rem}}.landing-brand{display:inline-flex;min-width:0px;align-items:center;gap:.75rem}.landing-brand__mark{position:relative;display:block;flex-shrink:0;width:2.1rem;height:2.1rem}.landing-brand__shape{position:absolute;display:block;box-shadow:0 1px 2px #0f172a1a}.landing-brand__shape--1{left:0;top:0;width:.64rem;height:2.1rem;border-radius:.45rem;background:var(--color-ch1)}.landing-brand__shape--2{left:.86rem;top:0;width:1.14rem;height:.58rem;border-radius:.22rem .7rem .22rem .22rem;background:var(--color-ch3)}.landing-brand__shape--3{left:.86rem;top:.76rem;width:1.14rem;height:.58rem;border-radius:.22rem .22rem 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