@font-face{font-family:Inter;src:url(../fonts/InterVariable.woff2) format("woff2-variations");font-weight:100 900;font-style:normal;font-display:swap}@font-face{font-family:JetBrains Mono;src:url(../fonts/JetBrainsMono-Regular.woff2) format("woff2");font-weight:400;font-style:normal;font-display:swap}@font-face{font-family:JetBrains Mono;src:url(../fonts/JetBrainsMono-Medium.woff2) format("woff2");font-weight:500 700;font-style:normal;font-display:swap}:root{--color-brand-50: oklch(.97 .02 255);--color-brand-100: oklch(.93 .05 255);--color-brand-200: oklch(.85 .1 257);--color-brand-300: oklch(.73 .15 258);--color-brand-400: oklch(.6 .19 259);--color-brand-500: #2B5BD7;--color-brand-600: oklch(.45 .2 260);--color-brand-700: oklch(.37 .17 260);--color-brand-800: oklch(.28 .13 260);--color-brand-900: oklch(.2 .09 260);--color-accent: var(--color-brand-500);--color-accent-hover: var(--color-brand-600);--color-accent-muted: var(--color-brand-300);--color-bg-primary: #F5F1E8;--color-bg-secondary: #FBF8F0;--color-bg-tertiary: #FFFFFF;--color-bg-sunken: #EDE7D9;--color-bg-ink: #1A1814;--color-fg-primary: #1C1A15;--color-fg-secondary: #5E584B;--color-fg-tertiary: #706A5A;--color-fg-on-accent: #FFFFFF;--color-border-subtle: rgba(28, 26, 21, .1);--color-border-strong: rgba(28, 26, 21, .18);--color-border-accent: rgba(43, 91, 215, .25);--color-border-accent: color-mix(in oklch, var(--color-brand-500) 25%, transparent);--color-status-success: oklch(.55 .14 155);--color-status-warning: oklch(.7 .14 75);--color-status-danger: oklch(.55 .18 25);--font-family-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-family-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;--font-size-100: 11px;--font-size-200: 12px;--font-size-300: 13px;--font-size-400: 15px;--font-size-500: 17px;--font-size-600: 24px;--font-size-700: 32px;--font-size-800: 48px;--line-height-tight: 1.15;--line-height-snug: 1.35;--line-height-normal: 1.55;--line-height-relaxed: 1.7;--radius-xs: 4px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 18px;--radius-xl: 28px;--radius-pill: 999px;--shadow-1: 0 2px 6px rgba(26, 24, 20, .06), 0 1px 2px rgba(26, 24, 20, .04);--shadow-2: 0 8px 20px rgba(26, 24, 20, .08), 0 2px 6px rgba(26, 24, 20, .05);--shadow-3: 0 24px 48px rgba(26, 24, 20, .1), 0 4px 12px rgba(26, 24, 20, .06);--shadow-inset: inset 0 1px 2px rgba(26, 24, 20, .05);--shadow-accent: 0 12px 32px rgba(43, 91, 215, .28);--shadow-accent: 0 12px 32px color-mix(in oklch, var(--color-brand-500) 28%, transparent);--z-base: 0;--z-dropdown: 20;--z-sidebar: 40;--z-topnav: 60;--z-modal: 80;--z-toast: 100;--z-tweaks: 120;--space-scale: 1;--space-1: calc(4px * var(--space-scale));--space-2: calc(8px * var(--space-scale));--space-3: calc(12px * var(--space-scale));--space-4: calc(16px * var(--space-scale));--space-5: calc(20px * var(--space-scale));--space-6: calc(24px * var(--space-scale));--space-7: calc(32px * var(--space-scale));--space-8: calc(40px * var(--space-scale));--space-9: calc(48px * var(--space-scale));--space-10: calc(64px * var(--space-scale));--space-11: calc(80px * var(--space-scale));--space-12: calc(96px * var(--space-scale));--layout-page-padding-x: clamp(20px, 5vw, 64px);--layout-page-padding-y: calc(96px * var(--space-scale));--layout-topnav-height: 68px;--layout-sidebar-width: 248px;--layout-max-content: 1240px;--transition-fast: .12s ease;--transition-base: .2s ease;--font-serif: Georgia, "Times New Roman", Times, serif;--text-xl: 22px;--sidebar-width: 240px;--sidebar-width-collapsed: 56px}[data-theme=dark]{--color-bg-primary: #141310;--color-bg-secondary: #1D1B16;--color-bg-tertiary: #26231C;--color-bg-sunken: #0F0E0B;--color-bg-ink: #000000;--color-fg-primary: #F1ECDF;--color-fg-secondary: #B5AE9C;--color-fg-tertiary: #8E8672;--color-fg-on-accent: #FFFFFF;--color-border-subtle: rgba(241, 236, 223, .1);--color-border-strong: rgba(241, 236, 223, .18);--color-status-success: oklch(.72 .16 155);--color-status-warning: oklch(.8 .14 75);--color-status-danger: oklch(.7 .18 25);--shadow-1: 0 2px 6px rgba(0, 0, 0, .35), 0 1px 2px rgba(0, 0, 0, .25);--shadow-2: 0 8px 20px rgba(0, 0, 0, .45), 0 2px 6px rgba(0, 0, 0, .3);--shadow-3: 0 24px 48px rgba(0, 0, 0, .55), 0 4px 12px rgba(0, 0, 0, .35);--shadow-accent: 0 12px 32px rgba(43, 91, 215, .4);--shadow-accent: 0 12px 32px color-mix(in oklch, var(--color-brand-500) 40%, transparent)}[data-density=compact]{--space-scale: .75}[data-density=cozy]{--space-scale: 1}[data-density=roomy]{--space-scale: 1.25}@media print{:root{--color-bg-primary: #FFFFFF;--color-bg-secondary: #FFFFFF;--color-bg-tertiary: #FFFFFF;--color-bg-sunken: #FFFFFF;--color-fg-primary: #000000;--color-fg-secondary: #333333;--color-fg-tertiary: 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var(--color-brand-500);outline-offset:2px}.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:absolute;top:0;left:0;z-index:1000;padding:var(--space-2) var(--space-4);background:var(--color-brand-500);color:var(--color-fg-on-accent);text-decoration:none;border-radius:0 0 var(--radius-sm) 0;transform:translateY(-200%);transition:transform var(--transition-fast)}.skip-link:focus,.skip-link:focus-visible{transform:translateY(0);outline:2px solid var(--color-fg-on-accent);outline-offset:-2px;text-decoration:none}@media (pointer: coarse){button,.worksheet-list__action,.worksheet-list__button,.editor-view__btn,.editor-view__block-btn,.print-editor__btn,.block-editor__button,.print-preview__btn,.modal__button,.topnav-hamburger,.nav-links a{min-height:44px}}.boot-placeholder{max-width:640px;margin:10vh auto;padding:var(--space-6);text-align:center}.boot-placeholder h1{font-size:var(--font-size-700);margin:0 0 var(--space-4)}.boot-placeholder .meta{color:var(--color-fg-secondary);font-size:var(--font-size-300);margin-top:var(--space-5)}body{background:var(--color-bg-primary);color:var(--color-fg-primary);font-family:var(--font-family-sans);font-size:var(--font-size-400);line-height:var(--line-height-normal);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-feature-settings:"ss01","cv11";transition:background .3s ease,color .3s ease;padding-top:var(--layout-topnav-height)}img{max-width:100%;display:block}h1,h2,h3,h4{font-family:var(--font-family-sans);font-weight:600;letter-spacing:-.02em;line-height:var(--line-height-tight);margin:0;text-wrap:balance;color:var(--color-fg-primary)}p{margin:0;text-wrap:pretty}::selection{background:color-mix(in oklch,var(--color-brand-500) 25%,transparent);color:var(--color-fg-primary)}.mono{font-family:var(--font-family-mono);font-feature-settings:"ss01";letter-spacing:.08em;text-transform:uppercase}.eyebrow{font-family:var(--font-family-sans);font-size:12.5px;font-weight:600;color:var(--color-fg-secondary)}.eyebrow--meta{font-family:var(--font-family-mono);font-size:var(--font-size-100);font-weight:500;letter-spacing:.08em;text-transform:uppercase}.btn{display:inline-flex;align-items:center;gap:var(--space-2);padding:12px 22px;border-radius:var(--radius-pill);font-weight:500;font-size:var(--font-size-400);font-family:inherit;border:none;cursor:pointer;transition:transform .15s ease,box-shadow .2s ease,background .2s ease;white-space:nowrap;text-decoration:none;color:inherit}.btn-primary{background:var(--color-brand-500);color:var(--color-fg-on-accent);box-shadow:var(--shadow-1)}.btn-primary:hover{background:var(--color-brand-600);transform:translateY(-1px);box-shadow:var(--shadow-accent);text-decoration:none;color:var(--color-fg-on-accent)}.btn-primary:active{transform:translateY(0)}.btn-ghost{color:var(--color-fg-primary);background:transparent;border:1px solid var(--color-border-strong)}.btn-ghost:hover{background:var(--color-bg-tertiary);border-color:var(--color-brand-500);color:var(--color-brand-600);text-decoration:none}.btn-sm{padding:8px 14px;font-size:var(--font-size-300)}.btn-danger{color:#fff;background:var(--color-status-danger);border:1px solid color-mix(in oklch,var(--color-status-danger) 70%,#000)}.btn-danger:hover{background:color-mix(in oklch,var(--color-status-danger) 85%,#000);color:#fff;text-decoration:none}.btn-danger:focus-visible{outline:none;box-shadow:0 0 0 3px color-mix(in oklch,var(--color-status-danger) 35%,transparent)}.chip{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border-radius:var(--radius-pill);background:color-mix(in oklch,var(--color-brand-500) 10%,transparent);color:var(--color-brand-600);font-family:var(--font-family-mono);font-size:var(--font-size-100);font-weight:500;letter-spacing:.06em;text-transform:uppercase}[data-theme=dark] .chip{background:color-mix(in oklch,var(--color-brand-500) 18%,transparent);color:var(--color-brand-200)}.chip-beta:before{content:"";width:6px;height:6px;border-radius:50%;background:var(--color-brand-500);box-shadow:0 0 0 3px color-mix(in oklch,var(--color-brand-500) 20%,transparent);animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.shell{max-width:var(--layout-max-content);margin:0 auto;padding:0 var(--layout-page-padding-x)}.topnav{position:fixed;top:0;left:0;right:0;width:100%;z-index:var(--z-topnav);backdrop-filter:blur(18px);background:color-mix(in 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span{position:absolute;left:0;width:100%;height:var(--burger-h);background:var(--color-fg-primary);border-radius:2px}.topnav-hamburger .burger-lines span:nth-child(1){top:0}.topnav-hamburger .burger-lines span:nth-child(2){top:calc(var(--burger-h) + var(--burger-gap))}.topnav-hamburger .burger-lines span:nth-child(3){top:calc((var(--burger-h) + var(--burger-gap)) * 2)}.brand{display:flex;align-items:center;gap:0;flex-shrink:0;padding:0 20px 0 var(--space-4);height:100%;font-weight:600;letter-spacing:-.01em;color:var(--color-fg-primary);text-decoration:none}body.sidebar-hidden .brand,body:not(.has-sidebar) .brand{padding-left:var(--space-2)}.brand:hover{text-decoration:none;color:var(--color-fg-primary)}.brand-logo{height:32px;width:auto;display:block}[data-theme=dark] .brand-logo{filter:invert(1) hue-rotate(180deg) brightness(1.05)}.nav-links{display:flex;gap:4px;align-items:center;flex:1;justify-content:flex-end}.nav-links a:not(.btn){font-size:var(--font-size-300);color:var(--color-fg-secondary);padding:8px 14px;border-radius:8px;text-decoration:none;transition:background .18s ease,color .18s ease}.nav-links a:not(.btn):hover{color:var(--color-brand-700);background:color-mix(in oklch,var(--color-brand-500) 12%,transparent);text-decoration:none}.nav-links a:not(.btn).active,.nav-links a:not(.btn)[aria-current=page]{color:var(--color-brand-700);background:color-mix(in oklch,var(--color-brand-500) 16%,transparent);font-weight:500}[data-theme=dark] .nav-links a:not(.btn):hover,[data-theme=dark] .nav-links a:not(.btn).active,[data-theme=dark] .nav-links a:not(.btn)[aria-current=page]{color:var(--color-brand-300)}.theme-toggle{background:transparent;border:1px solid var(--color-border-subtle);border-radius:var(--radius-sm);padding:6px 10px;font-size:var(--font-size-400);line-height:1;color:var(--color-fg-primary);cursor:pointer;transition:background var(--transition-fast),border-color var(--transition-fast)}.storage-quota-toast{position:fixed;top:16px;right:16px;z-index:8500;display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:var(--radius-sm);background:var(--color-warning-bg, #fff8e1);border:1px solid var(--color-warning-border, #f4c430);box-shadow:0 6px 20px #0000001f;font-size:var(--font-size-300);color:var(--color-fg-primary);max-width:min(420px,calc(100vw - 32px))}.storage-quota-toast--critical{background:var(--color-danger-bg, #ffe5e5);border-color:var(--color-danger-border, #d44)}.storage-quota-toast__msg{flex:1 1 auto}.storage-quota-toast__dismiss{background:transparent;border:none;color:var(--color-fg-secondary);font-size:18px;line-height:1;padding:4px 8px;cursor:pointer;border-radius:var(--radius-sm)}.storage-quota-toast__dismiss:hover{background:var(--color-bg-tertiary)}.sw-update-toast{position:fixed;bottom:16px;right:16px;z-index:9000;display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:var(--radius-sm);background:var(--color-bg-tertiary, #fff);border:1px solid var(--color-border-strong, #c8c4ba);box-shadow:0 8px 28px #00000026;font-size:var(--font-size-300);color:var(--color-fg-primary);max-width:min(420px,calc(100vw - 32px))}.sw-update-toast__msg{flex:1 1 auto}.sw-update-toast__accept{background:var(--color-brand-600, #2B5BD7);color:#fff;border:1px solid var(--color-brand-700, #1f44a8);border-radius:var(--radius-sm);padding:6px 12px;font-weight:500;cursor:pointer}.sw-update-toast__accept:hover{background:var(--color-brand-700, #1f44a8)}.sw-update-toast__accept:disabled{opacity:.6;cursor:progress}.sw-update-toast__dismiss{background:transparent;border:none;color:var(--color-fg-secondary);font-size:18px;line-height:1;padding:4px 8px;cursor:pointer;border-radius:var(--radius-sm)}.sw-update-toast__dismiss:hover{background:var(--color-bg-tertiary)}.install-btn{background:var(--color-brand-600, #2B5BD7);color:#fff;border:1px solid var(--color-brand-700, 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#1f44a8)}.user-badge__pill:active{transform:translateY(1px)}.user-badge__pill:focus-visible{outline:2px solid var(--color-brand-300, #94afe8);outline-offset:2px}.user-badge__initials{line-height:1}.user-badge__menu{position:absolute;top:calc(100% + 6px);right:0;z-index:9100;min-width:220px;padding:var(--space-2);display:flex;flex-direction:column;gap:var(--space-2);background:var(--color-bg-primary, #fff);border:1px solid var(--color-border-strong, #c8c4ba);border-radius:var(--radius-sm);box-shadow:0 8px 28px #00000026;color:var(--color-fg-primary)}.user-badge__menu-header{display:flex;flex-direction:column;gap:2px;padding:var(--space-2) var(--space-2) var(--space-1);border-bottom:1px solid var(--color-border-subtle)}.user-badge__menu-name{font-weight:600;font-size:var(--font-size-300)}.user-badge__menu-email{font-size:var(--font-size-200);color:var(--color-fg-secondary);word-break:break-all}.user-badge__menu-item{text-align:left;padding:var(--space-2);background:transparent;border:1px 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var(--transition-fast)}.resubmit-dialog__button:hover:not(:disabled){background:var(--color-bg-sunken);border-color:var(--color-border-strong)}.resubmit-dialog__button:disabled{opacity:.5;cursor:not-allowed}.resubmit-dialog__button--primary{background:var(--color-brand-500);color:var(--color-fg-on-accent);border-color:var(--color-brand-500)}.resubmit-dialog__button--primary:hover:not(:disabled){background:var(--color-brand-600);border-color:var(--color-brand-600)}.resubmit-banner[hidden]{display:none}.resubmit-banner{margin:var(--space-4) 0;padding:var(--space-4);border:1px solid var(--color-status-warning);border-left-width:4px;border-radius:var(--radius-sm);background:#f9a82514;color:var(--color-fg-primary)}.resubmit-banner__title{margin:0 0 var(--space-2);font-size:var(--font-size-400);font-weight:600}.resubmit-banner__list{margin:0 0 var(--space-3);padding-left:var(--space-5);list-style:disc}.resubmit-banner__item{margin-bottom:var(--space-2)}.resubmit-banner__link{color:var(--color-brand-500);font-weight:500;text-decoration:underline}.resubmit-banner__reason{margin:var(--space-1) 0 0;font-size:var(--font-size-300);color:var(--color-fg-secondary);font-style:italic}.resubmit-banner__actions{display:flex;justify-content:flex-end}.resubmit-banner__button{padding:var(--space-2) var(--space-4);border:1px solid var(--color-border-subtle);border-radius:var(--radius-sm);background:transparent;color:var(--color-fg-primary);font-size:var(--font-size-300);cursor:pointer;transition:background var(--transition-fast)}.resubmit-banner__button:hover:not(:disabled){background:var(--color-bg-sunken)}.resubmit-banner__button--primary{background:var(--color-brand-500);color:var(--color-fg-on-accent);border-color:var(--color-brand-500)}.resubmit-banner__button--primary:hover:not(:disabled){background:var(--color-brand-600)}.submissions-table__actions{white-space:nowrap;text-align:right}.submissions-table__actions{display:flex;flex-wrap:wrap;gap:var(--space-2);justify-content:flex-end}.submissions-table__action-btn{padding:var(--space-1) var(--space-3);border:1px solid var(--color-border-subtle);border-radius:var(--radius-sm);background:var(--color-bg-primary);color:var(--color-fg-primary);font-size:var(--font-size-200);font-weight:500;cursor:pointer;transition:background var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast)}.submissions-table__action-btn:hover{background:var(--color-bg-sunken);border-color:var(--color-border-strong)}.submissions-table__action-btn--resubmit:hover,.submissions-table__action-btn--view:hover,.submissions-table__action-btn--grade:hover{background:var(--color-brand-500);color:var(--color-fg-on-accent);border-color:var(--color-brand-500)}.submissions-table__action-btn--delete{color:var(--color-status-danger, var(--color-status-warning))}.submissions-table__action-btn--delete:hover{background:var(--color-status-danger, var(--color-status-warning));color:var(--color-fg-on-accent);border-color:var(--color-status-danger, var(--color-status-warning))}.submission-feedback{max-width:32rem;width:100%}.submission-feedback__title{margin:0 0 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var(--color-brand-500);outline-offset:2px}.submissions-filters{display:flex;flex-wrap:wrap;align-items:flex-end;gap:var(--space-4);margin-bottom:var(--space-4)}.submissions-filter{display:flex;flex-direction:column;gap:var(--space-1)}.submissions-filter__label{font-size:var(--font-size-100);font-weight:500;color:var(--color-fg-secondary)}.submissions-filter__select,.submissions-filter__input{padding:var(--space-1) var(--space-2);border:1px solid var(--color-border-subtle);border-radius:var(--radius-sm);background:var(--color-bg-tertiary);color:var(--color-fg-primary);font-size:var(--font-size-200)}.submissions-filter--search 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var(--color-border-subtle);border-radius:var(--radius-sm);background:var(--color-bg-secondary)}.submissions-stats__item{display:flex;flex-direction:column;line-height:1.2}.submissions-stats__value{font-size:var(--font-size-400);font-weight:700;color:var(--color-fg-primary)}.submissions-stats__label{font-size:var(--font-size-100);color:var(--color-fg-secondary)}.submissions-table__sort{display:inline-flex;align-items:center;gap:2px;background:none;border:none;padding:0;margin:0;font:inherit;font-weight:600;color:inherit;cursor:pointer}.submissions-table__sort:hover{color:var(--color-brand-500)}.submissions-table__sort:focus-visible{outline:2px solid var(--color-brand-500);outline-offset:2px}.submissions-table__sort-arrow{font-size:.85em;color:var(--color-brand-500)}.submissions-table__empty{text-align:center;color:var(--color-fg-secondary);padding:var(--space-5)}.submissions-status-badges{display:flex;flex-wrap:wrap;gap:var(--space-1)}.submissions-status-badge{display:inline-block;padding:2px var(--space-2);border-radius:var(--radius-xs);font-size:var(--font-size-100);font-weight:500;white-space:nowrap;line-height:1.4;border:1px solid transparent}.submissions-status-badge--on-time{background:color-mix(in oklch,var(--color-status-success) 12%,transparent);color:color-mix(in oklch,var(--color-status-success) 80%,#000);border-color:color-mix(in oklch,var(--color-status-success) 35%,transparent)}.submissions-status-badge--late{background:color-mix(in oklch,var(--color-status-warning) 14%,transparent);color:color-mix(in oklch,var(--color-status-warning) 80%,#000);border-color:color-mix(in oklch,var(--color-status-warning) 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