:root{color-scheme:light dark;--bg: #fbfaf8;--surface: #ffffff;--surface-2: #f4f2ef;--surface-3: #ebe8e3;--ink: #17171b;--ink-soft: #6e6e78;--ink-faint: #9a9aa4;--line: #e7e4df;--line-strong: #d6d2cb;--brand: #2b5bd0;--brand-soft: #eaf0fd;--brand-ink: #ffffff;--btn-bg: #1c1c22;--btn-fg: #ffffff;--btn-bg-hover: #33333d;--accent: #1e7d5a;--accent-soft: #e4f2ec;--warn: #93701f;--warn-soft: #fbf1d9;--warn-ink: #6d5316;--danger: #c0392f;--danger-soft: #fbe8e6;--danger-ink: #96291f;--rail-bg: #f4f2ef;--rail-ink: #5d5d67;--rail-ink-active: #17171b;--tint: 1a;--text-xs: .75rem;--text-sm: .825rem;--text-base: .9375rem;--text-md: 1.0625rem;--text-lg: 1.1875rem;--text-xl: 1.5rem;--text-2xl: 1.875rem;--leading-tight: 1.25;--leading: 1.55;--tracking-tight: -.014em;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.5rem;--space-6: 2rem;--radius: 14px;--radius-sm: 9px;--radius-xs: 6px;--shadow: 0 1px 2px rgba(23, 23, 27, .04);--shadow-raised: 0 2px 4px rgba(23, 23, 27, 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0, .45)}}:root[data-theme=dark]{--bg: #101014;--surface: #17171d;--surface-2: #1f1f27;--surface-3: #2a2a34;--ink: #ececf1;--ink-soft: #9b9baa;--ink-faint: #6d6d7c;--line: #2a2a33;--line-strong: #3a3a46;--brand: #7fa4f5;--brand-soft: #1c2537;--brand-ink: #0f1219;--btn-bg: #ececf1;--btn-fg: #17171b;--btn-bg-hover: #ffffff;--accent: #4fbb92;--accent-soft: #13291f;--warn: #d3ab53;--warn-soft: #2c2411;--warn-ink: #e3c88e;--danger: #e8837a;--danger-soft: #33191a;--danger-ink: #f0aaa4;--rail-bg: #15151a;--rail-ink: #9b9baa;--rail-ink-active: #ececf1;--tint: 33;--shadow: 0 1px 2px rgba(0, 0, 0, .5);--shadow-raised: 0 2px 4px rgba(0, 0, 0, .5), 0 12px 28px rgba(0, 0, 0, .45)}*{box-sizing:border-box}body{margin:0;font-family:var(--font);font-size:var(--text-base);line-height:var(--leading);background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility}h1,h2,h3,h4{line-height:var(--leading-tight);letter-spacing:var(--tracking-tight);font-weight:650}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}.icon{flex:0 0 auto;vertical-align:-.16em}:where(a,button,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:var(--radius-xs)}@media (prefers-reduced-motion: 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auto}.calendar-item.is-event{background:var(--surface);border-style:dashed}.calendar-more{font-size:var(--text-xs);color:var(--ink-soft);padding:.2rem;text-align:left;text-decoration:underline;min-height:24px}.calendar-more:hover{color:var(--brand)}.calendar-caption{margin-top:var(--space-2)}.calendar-add{width:22px;height:22px;line-height:1;border-radius:6px;font-size:var(--text-base);color:var(--ink-soft);background:transparent;opacity:0;transition:opacity .12s ease}.calendar-cell:hover .calendar-add,.calendar-add:focus-visible{opacity:1}.calendar-add:hover{background:var(--brand-soft);color:var(--brand)}@media (hover: none){.calendar-add{opacity:.55}}.cal-legend{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:.9rem}.legend-chip{display:inline-flex;align-items:center;gap:.35rem;font-size:var(--text-sm);padding:.3rem .65rem;border-radius:99px;border:1px solid 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.rail-glyph{color:var(--brand)}.rail-glyph{display:grid;place-items:center;font-size:1.15rem;line-height:1}.rail-glyph .icon{vertical-align:0}.rail-main{flex:1;min-width:0;display:flex;flex-direction:column}.dashboard-layout{display:grid;grid-template-columns:1fr 260px;gap:var(--space-5);align-items:start}.course-card-grid{display:grid;gap:var(--space-4);grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}.course-card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;color:var(--ink);transition:transform .18s var(--ease),box-shadow .18s var(--ease),border-color .18s var(--ease)}.course-card:hover{text-decoration:none;transform:translateY(-2px);box-shadow:var(--shadow-raised);border-color:var(--line-strong)}.course-card-hero{height:5px}.course-card-body{padding:var(--space-3) var(--space-4) .4rem}.course-card-body h3{margin:0 0 .2rem;font-size:var(--text-md)}.course-card-body .sub{margin:0;font-size:var(--text-sm);color:var(--ink-soft)}.course-card-icons{display:flex;gap:.9rem;padding:.55rem var(--space-4) .7rem;margin-top:auto;font-size:.95rem;opacity:.75}.todo-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:var(--space-4) 1.1rem;position:sticky;top:4.5rem}.todo-panel h2{margin:0 0 .7rem;font-size:var(--text-md)}.todo-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.55rem}.todo-list a{display:flex;align-items:center;gap:.45rem;color:var(--ink);flex-wrap:wrap}.todo-list a:hover{text-decoration:none}.todo-list a:hover .todo-title{text-decoration:underline;color:var(--brand)}.todo-title{font-size:.84rem;font-weight:600;flex:1 1 100%}.todo-meta{font-size:var(--text-xs);color:var(--ink-soft);margin-left:var(--space-4)}.announcement-row{color:var(--ink);padding:var(--space-3) var(--space-4)}.announcement-row:hover{text-decoration:none;border-color:var(--brand)}.course-header{padding:0 0 var(--space-4);border-bottom:1px solid var(--line);margin-bottom:var(--space-5);display:flex;justify-content:space-between;align-items:center;gap:var(--space-4);flex-wrap:wrap}.course-header h1{margin:0 0 .2rem;font-size:var(--text-2xl)}.course-header .sub{margin:0;color:var(--ink-soft);font-size:var(--text-sm)}.course-body{display:grid;grid-template-columns:168px 1fr;gap:var(--space-5);align-items:start}.course-nav{display:flex;flex-direction:column;position:sticky;top:4.5rem;border-right:1px solid var(--line);padding-right:var(--space-1)}.course-nav a{padding:.45rem .7rem;font-size:var(--text-sm);font-weight:550;color:var(--ink-soft);border-radius:var(--radius-xs);white-space:nowrap;transition:background-color .15s var(--ease),color .15s var(--ease)}.course-nav a:hover{background:var(--surface-2);color:var(--ink);text-decoration:none}.course-nav a.active{font-weight:650;color:var(--ink);background:var(--surface-2)}.course-content{min-width:0}.plain-list{list-style:none;margin:0;padding:0}.plain-list.boxed{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:var(--surface)}.list-row{display:flex;justify-content:space-between;align-items:center;gap:var(--space-4);padding:.65rem .9rem;border-bottom:1px solid var(--line)}.plain-list:not(.boxed) .list-row{padding-left:0;padding-right:0}.list-row:last-child{border-bottom:none}.group-label{font-size:var(--text-xs);font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-faint);margin:0 0 var(--space-2)}.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}.data-table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);font-size:.88rem}.data-table th{text-align:left;font-size:var(--text-xs);text-transform:uppercase;letter-spacing:.04em;font-weight:600;color:var(--ink-soft);background:var(--surface-2);padding:.6rem var(--space-3)}.data-table td{padding:.7rem var(--space-3);border-top:1px solid var(--line);vertical-align:top}.avatar{display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;background:var(--surface-3);color:var(--ink-soft);font-size:var(--text-xs);font-weight:650;margin-right:4px;flex:0 0 auto}.quiz-card-grid{display:grid;gap:var(--space-4);grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}.quiz-card{display:flex;flex-direction:column;justify-content:space-between}.builder-choice{flex:1 1 44%;margin-bottom:var(--space-2)}.quiz-choices{display:flex;flex-direction:column;gap:.4rem}.quiz-choice{display:flex;align-items:center;gap:.55rem;padding:var(--space-2) .7rem;border:1px solid var(--line);border-radius:var(--radius-sm);font-size:var(--text-base);cursor:pointer;min-height:var(--tap)}.quiz-choice:hover{border-color:var(--brand)}.quiz-choice.selected{border-color:var(--brand);background:var(--brand-soft);font-weight:600}.quiz-choice.correct{border-color:var(--accent);background:var(--accent-soft);font-weight:600}.quiz-choice.incorrect{border-color:var(--danger);background:var(--danger-soft)}.quiz-choice input{accent-color:var(--brand)}.quiz-choice input:disabled{cursor:default}.quiz-choice .mark{margin-left:auto;font-weight:700}.quiz-choice.correct .mark{color:var(--accent)}.quiz-choice.incorrect .mark{color:var(--danger)}.quiz-question-row{display:flex;justify-content:space-between;align-items:flex-start;gap:var(--space-3);padding:.4rem 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