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:root{--brand-green:#24ac7d;--brand-green-deep:#157158;--brand-green-mid:#50bd97;--brand-green-soft:#92d6be;--brand-orange:#ff742d;--brand-orange-mid:#ff8f56;--brand-orange-soft:#ffb996;--brand-yellow:#ffc210;--brand-yellow-mid:#ffce41;--brand-yellow-soft:#ffe189;--brand-chartreuse:#c9c700;--student-assignment-canvas:#fffaf0;--student-assignment-paper:#fff;--student-assignment-ink:#352a17;--student-assignment-muted:#69583b;--student-assignment-line:#d9c997;--student-assignment-action:#ffe08a;--student-assignment-action-hover:#ffd466;--student-assignment-action-edge:#9a6900;--student-assignment-action-deep:#745000;--student-assignment-wash:#fff3c6;--learner-dock-button-height:80px;--learner-dock-button-radius:20px;--learner-dock-font-size:1.5rem;--learner-dock-padding:32px;--learner-dock-icon-size:28px;--learner-dock-feedback-icon-size:48px;--student-subject-english:#ffe08a;--student-subject-english-soft:#fff7da;--student-subject-english-edge:#9a6900;--student-subject-english-deep:#745000;--student-subject-chinese:#f3a39d;--student-subject-chinese-soft:#fff0ee;--student-subject-chinese-edge:#a94742;--student-subject-chinese-deep:#782f2b;--student-subject-mathematics:#a9d5a6;--student-subject-mathematics-soft:#edf8eb;--student-subject-mathematics-edge:#3f7e4d;--student-subject-mathematics-deep:#285d36;--student-subject-science:#a9d4f5;--student-subject-science-soft:#edf7ff;--student-subject-science-edge:#376f9b;--student-subject-science-deep:#255273;--student-answer-correct:#ddf2d7;--student-answer-correct-edge:#4f8c57;--student-answer-correct-ink:#234b2a;--student-answer-incorrect:#ffe2de;--student-answer-incorrect-edge:#ad4e47;--student-answer-incorrect-ink:#6b2b27;--neutral-950:#202020;--neutral-700:#4d4d4d;--neutral-500:#909090;--neutral-300:#d2d2d2;--neutral-100:color-mix(in srgb, var(--neutral-300) 28%, var(--white));--placeholder:#767676;--placeholder-on-soft:#6e6e6e;--white:#fff;--off-white:#fffff9;--off-white-raised:#fff;--campus:color-mix(in srgb, var(--off-white) 92%, var(--neutral-300));--paper:var(--white);--ink:var(--neutral-950);--ink-soft:var(--neutral-700);--navy-2:var(--neutral-700);--route:var(--brand-green);--route-hover:var(--brand-green-mid);--route-dark:var(--neutral-950);--route-soft:color-mix(in srgb, var(--brand-green-soft) 28%, var(--white));--lime:var(--brand-yellow);--lime-soft:var(--brand-yellow-soft);--lime-ink:var(--neutral-950);--coral:var(--brand-orange);--coral-mid:var(--brand-orange-mid);--coral-soft:color-mix(in srgb, var(--brand-orange-soft) 62%, var(--white));--line:color-mix(in srgb, var(--neutral-300) 68%, var(--white));--line-strong:color-mix(in srgb, var(--neutral-300) 74%, var(--neutral-500));--glass:color-mix(in srgb, var(--brand-green-soft) 13%, var(--white));--surface-hover:color-mix(in srgb, var(--brand-green-soft) 17%, var(--white));--success:var(--brand-green);--success-soft:color-mix(in srgb, var(--brand-green-soft) 68%, var(--white));--warning:var(--neutral-950);--warning-soft:color-mix(in srgb, var(--brand-yellow-soft) 64%, var(--white));--focus:color-mix(in srgb, var(--brand-orange) 34%, var(--neutral-950));--focus-halo:#6f43291f;--focus-field-border:color-mix(in srgb, var(--neutral-700) 42%, var(--neutral-300));--focus-field-inset:color-mix(in srgb, var(--neutral-700) 30%, transparent);--focus-field-shadow:#20202017;--focus-choice-inset:color-mix(in srgb, var(--neutral-700) 38%, var(--neutral-300));--focus-choice-shadow:#2020201a;--focus-ochre-border:color-mix(in srgb, var(--student-assignment-action-deep) 46%, var(--student-assignment-line));--focus-ochre-inset:color-mix(in srgb, var(--student-assignment-action-deep) 32%, transparent);--focus-ochre-ring:color-mix(in srgb, var(--student-assignment-action-deep) 34%, transparent);--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--font-display:"Poppins", "Noto Sans HK", "PingFang TC", "Microsoft JhengHei", sans-serif;--font-ui:"Inter", "Noto Sans HK", "PingFang TC", "Microsoft JhengHei", sans-serif;--directory-width:240px;--topbar-height:68px;font-synthesis:none}*{box-sizing:border-box}html{background:var(--campus);min-width:320px;color:var(--ink);scroll-behavior:smooth}body{background:var(--campus);min-height:100vh;color:var(--ink);font-family:var(--font-display);text-rendering:optimizelegibility;margin:0;font-size:16px;line-height:1.5}button,input,select,textarea{caret-color:var(--brand-orange);color:inherit;font:inherit}input::placeholder,textarea::placeholder{color:var(--placeholder);opacity:1}button,select,input[type=checkbox],input[type=radio]{cursor:pointer}button{border:0}a,button{-webkit-tap-highlight-color:transparent}::selection{background:var(--lime);color:var(--lime-ink)}::-webkit-scrollbar{width:11px;height:11px}::-webkit-scrollbar-track{background:var(--glass)}::-webkit-scrollbar-thumb{background:var(--neutral-700);border:3px solid var(--glass);border-radius:8px}:focus-visible{outline:2px solid var(--focus);outline-offset:2px;box-shadow:0 6px 18px var(--focus-halo)}:where(input:not([type]),input[type=text],input[type=search],input[type=email],input[type=password],input[type=url],input[type=tel],input[type=number],input[type=date],input[type=time],input[type=datetime-local],textarea,select):focus-visible{border-color:var(--focus-field-border);box-shadow:inset 0 -2px 0 var(--focus-field-inset), 0 5px 16px var(--focus-field-shadow);outline:none}@media (forced-colors:active){:where(input:not([type]),input[type=text],input[type=search],input[type=email],input[type=password],input[type=url],input[type=tel],input[type=number],input[type=date],input[type=time],input[type=datetime-local],textarea,select):focus-visible{outline-offset:2px;box-shadow:none;border-color:highlight;outline:2px solid highlight}}#main-content h1[tabindex="-1"]:focus{box-shadow:none;outline:none}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-family:var(--font-display);font-weight:600}h1{letter-spacing:-.028em;max-width:18ch;margin-bottom:10px;font-size:clamp(1.85rem,2.4vw,2.5rem);line-height:1.08}h2{letter-spacing:-.018em;margin-bottom:6px;font-size:clamp(1.15rem,1.4vw,1.4rem);line-height:1.25}h3{letter-spacing:-.008em;margin-bottom:7px;font-size:1rem;font-weight:600}p{max-width:72ch;color:var(--ink-soft)}strong,b{font-weight:600}button:disabled{cursor:not-allowed;opacity:.55}.app-frame--teacher-dock{font-family:var(--font-ui)}.app-frame--teacher-dock h1,.app-frame--teacher-dock h2,.app-frame--teacher-dock h3{font-family:var(--font-display)}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.skip-link{z-index:1000;border-radius:var(--radius-sm);background:var(--lime);color:var(--lime-ink);padding:10px 14px;font-weight:600;position:fixed;top:12px;left:12px;transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}.app-frame{min-height:100vh}.directory{z-index:40;width:var(--directory-width);overscroll-behavior:contain;background:color-mix(in srgb, var(--ink) 97%, var(--white));color:var(--white);flex-direction:column;display:flex;position:fixed;inset:0 auto 0 0;overflow-y:auto}.directory__brand{min-height:var(--topbar-height);border-bottom:1px solid var(--neutral-700);align-items:center;gap:8px;padding:0 18px;display:flex}.brand-logo{width:172px;height:auto;display:block}.brand-icon,.directory-role-select__avatar,.directory-role-select__tooltip{display:none}.directory__close{margin-left:auto;color:var(--white)!important;display:none!important}.directory__school{border-bottom:1px solid var(--neutral-700);color:var(--neutral-300);gap:11px;padding:18px;display:flex}.directory__school svg{color:var(--lime);flex:none;margin-top:2px}.directory__school strong,.directory__school span{display:block}.directory__school strong{color:var(--white);font-size:.88rem;line-height:1.25}.directory__school span{color:var(--neutral-500);margin-top:4px;font-size:.74rem}.directory__nav{flex:1;padding:18px 10px}.directory__floor{color:var(--neutral-500);letter-spacing:.08em;text-transform:uppercase;margin:0 10px 9px;font-size:.68rem;font-weight:600;display:block}.directory__nav button,.directory__lower>button{width:100%;min-height:44px;color:var(--neutral-300);text-align:left;background:0 0;border-radius:7px;align-items:center;gap:11px;padding:10px 11px;font-weight:500;display:flex;position:relative}.directory__nav button:before,.directory__lower>button:before{content:"";background:0 0;width:3px;height:18px;position:absolute;top:13px;left:-12px}.directory__nav button:hover,.directory__lower>button:hover{background:color-mix(in srgb, var(--ink) 90%, var(--white));color:var(--white)}.directory__nav button.is-selected,.directory__lower>button.is-selected{background:color-mix(in srgb, var(--ink) 84%, var(--white));color:var(--white)}.directory__nav button.is-selected:before,.directory__lower>button.is-selected:before{background:var(--lime)}.directory__nav button span:nth-child(2),.directory__lower>button span{flex:1}.nav-count{background:var(--coral);min-width:24px;color:var(--ink);font-variant-numeric:tabular-nums;text-align:center;border-radius:999px;padding:2px 7px;font-size:.76rem;flex:none!important}.directory__lower{border-top:1px solid var(--neutral-700);padding:12px}.directory-role-select{border-top:1px solid var(--neutral-700);gap:6px;margin-top:12px;padding:13px 10px 3px;display:grid}.directory-role-select>span{color:var(--neutral-500);letter-spacing:.055em;text-transform:uppercase;font-size:.64rem;font-weight:600;line-height:1.25}.directory-role-select select{border:1px solid var(--neutral-500);border-radius:var(--radius-sm);background:var(--neutral-700);width:100%;min-height:44px;color:var(--white);--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;padding:8px 30px 8px 10px;font-size:.82rem;font-weight:600}.directory-role-select select:hover{border-color:var(--neutral-300)}.directory-role-select select:focus-visible{outline:2px solid var(--lime);outline-offset:2px;box-shadow:0 7px 18px #00000047}.directory-role-select+.directory__user{border-top:1px solid var(--neutral-700);margin-top:8px;padding-top:13px}.directory__user{align-items:center;gap:10px;padding:14px 10px 4px;display:flex}.directory__user strong,.directory__user span{display:block}.directory__user strong{color:var(--white);font-size:.84rem}@media (min-width:921px){.app-frame--teacher-dock{--directory-width:102px}.directory--teacher-dock{border-radius:22px;width:70px;inset:18px auto 18px 16px;overflow:visible;box-shadow:0 14px 34px #20202033}.directory--teacher-dock .directory__brand{border-bottom:0;justify-content:center;min-height:76px;padding:12px}.directory--teacher-dock .brand-logo{display:none}.directory--teacher-dock .brand-icon{width:42px;height:42px;display:block}.directory--teacher-dock .directory__school,.directory--teacher-dock .directory__floor,.directory--teacher-dock .directory__user{display:none}.directory--teacher-dock .directory__nav{flex-direction:column;justify-content:center;gap:8px;padding:14px 9px;display:flex}.directory--teacher-dock .directory__nav button,.directory--teacher-dock .directory__lower>button{border-radius:14px;flex:0 0 52px;justify-content:center;gap:0;width:52px;min-height:52px;padding:0}.directory--teacher-dock .directory__nav button svg,.directory--teacher-dock .directory__lower>button svg{width:22px;height:22px}.directory--teacher-dock .directory__nav button:before,.directory--teacher-dock .directory__lower>button:before{height:18px;top:17px;left:-7px}.directory--teacher-dock .directory__nav button:focus-visible,.directory--teacher-dock .directory__lower>button:focus-visible{outline-color:var(--brand-yellow);box-shadow:0 0 0 5px var(--ink)}.directory--teacher-dock .directory__tooltip,.directory-role-select--dock .directory-role-select__tooltip{z-index:60;visibility:hidden;border:1px solid var(--neutral-700);background:var(--ink);width:max-content;max-width:220px;color:var(--white);opacity:0;pointer-events:none;white-space:nowrap;border-radius:7px;flex:none;padding:7px 10px;font-size:.78rem;font-weight:600;line-height:1.3;transition:opacity .15s,transform .18s cubic-bezier(.16,1,.3,1),visibility 0s linear .18s;display:block;position:absolute;top:50%;left:calc(100% + 13px);transform:translate(6px,-50%);box-shadow:0 8px 20px #20202033}.directory--teacher-dock .directory__nav button:hover .directory__tooltip,.directory--teacher-dock .directory__nav button:focus-visible .directory__tooltip,.directory--teacher-dock .directory__lower>button:hover .directory__tooltip,.directory--teacher-dock 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var(--route) 68%, var(--white));width:38px;height:38px;color:var(--ink);letter-spacing:.02em;border-radius:11px;place-items:center;font-size:.76rem;font-weight:700;display:grid}.directory-role-select--dock select{opacity:0;border:0;width:52px;min-height:52px;padding:0;position:absolute;inset:0}.directory-role-select--dock:has(select:focus-visible){outline:3px solid var(--brand-yellow);outline-offset:2px;box-shadow:0 0 0 5px var(--ink)}.directory-role-select--dock select:focus-visible{box-shadow:none;outline:0}}.avatar{background:color-mix(in srgb, var(--route) 68%, var(--white));width:36px;height:36px;color:var(--ink);letter-spacing:.02em;border-radius:10px;flex:none;place-items:center;font-size:.78rem;font-style:normal;font-weight:700;display:inline-grid}.avatar--student{background:var(--success-soft);color:var(--ink)}.avatar--large{width:54px;height:54px;font-size:1rem}.nav-scrim{display:none}.app-body{min-height:100vh;margin-left:var(--directory-width)}.app-body--teacher{--topbar-height:0px}.topbar{z-index:30;min-height:var(--topbar-height);border-bottom:1px solid var(--line);background:#fffffffa;justify-content:space-between;align-items:center;gap:20px;padding:0 30px;display:flex;position:sticky;top:0}.topbar__menu{display:none!important}.topbar__context span,.topbar__context strong{display:block}.topbar__context span{color:var(--ink-soft);font-size:.74rem}.topbar__context strong{margin-top:2px;font-size:.92rem}.topbar__actions{align-items:center;gap:9px;min-width:0;display:flex}.teacher-mobile-menu{display:none!important}.icon-button{border-radius:var(--radius-sm);width:44px;height:44px;color:var(--ink-soft);background:0 0;place-items:center;display:inline-grid}.icon-button:hover{background:var(--surface-hover);color:var(--ink)}.language-switch{border-radius:var(--radius-sm);min-height:44px;color:var(--ink-soft);background:0 0;align-items:center;gap:7px;padding:0 10px;font-weight:500;display:inline-flex}.language-switch:hover{background:var(--surface-hover);color:var(--ink)}.subject-tone--all{--subject-accent:var(--neutral-700);--subject-surface:var(--glass)}.subject-tone--chinese{--subject-accent:var(--brand-yellow);--subject-surface:color-mix(in srgb, var(--brand-yellow-soft) 58%, var(--white))}.subject-tone--english{--subject-accent:var(--brand-orange);--subject-surface:color-mix(in srgb, var(--brand-orange-soft) 44%, var(--white))}.subject-tone--mathematics{--subject-accent:var(--brand-chartreuse);--subject-surface:color-mix(in srgb, var(--brand-chartreuse) 16%, var(--white))}.subject-tone--science{--subject-accent:var(--brand-green);--subject-surface:color-mix(in srgb, var(--brand-green-soft) 46%, var(--white))}.subject-switcher{border:1px solid var(--line-strong);border-radius:var(--radius-sm);background:var(--paper);cursor:pointer;flex:0 180px;grid-template-columns:38px minmax(0,1fr);align-items:stretch;width:180px;min-width:150px;min-height:48px;transition:border-color .16s,background .16s;display:grid;position:relative;overflow:hidden}.subject-switcher:hover{border-color:var(--ink)}.subject-switcher:focus-within{border-color:var(--focus-field-border);box-shadow:inset 0 -2px 0 var(--focus-field-inset), 0 5px 16px var(--focus-field-shadow);outline:none}.subject-switcher__icon{border-right:1px solid var(--line);border-bottom:2px solid 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