:root{--bg-color:#fff;--text-main:#111;--text-muted:#555;--text-light:#666;--border-subtle:#e5e5e5;--toc-link:#333;--code-bg:#f5f5f5;--pre-bg:#f7f7f7;--link-hover:#111;--callout-border-base:#dcdcdc;--callout-bg-base:#fafafa;--callout-def-border:#8da4ff;--callout-def-bg:#f3f5ff;--callout-note-border:#6ab7ff;--callout-note-bg:#eef7ff;--callout-warn-border:#ffb347;--callout-warn-bg:#fff5e6;--callout-proof-border:#c8c8c8;--callout-proof-bg:#f9f9f9;--callout-thm-border:#73c990;--callout-thm-bg:#f2fbf5}*,:before,:after{box-sizing:border-box}body{background:var(--bg-color);color:var(--text-main);margin:0;font-family:Inter,Helvetica Neue,Arial,sans-serif;line-height:1.6}a{color:inherit;text-decoration:underline}main{min-height:70vh}.container{width:min(1100px,92vw);margin:0 auto;padding:2.5rem 0 4rem}.site-header{border-bottom:1px solid var(--border-subtle)}.site-nav{gap:1.5rem;padding:1rem 0;font-size:.95rem;display:flex}.site-title{letter-spacing:.02em;font-weight:600}.site-nav-links{align-items:center;gap:1.5rem;font-size:.95rem;display:flex}.site-nav-desktop{display:flex}.mobile-menu-button{border:1px solid var(--border-subtle);width:2.5rem;height:2.5rem;color:var(--text-main);cursor:pointer;background:0 0;border-radius:8px;justify-content:center;align-items:center;transition:all .2s;display:none}.mobile-menu-button:hover{background:var(--code-bg)}.page-grid{grid-template-columns:220px minmax(0,1fr);align-items:start;gap:3rem;transition:grid-template-columns .3s cubic-bezier(.32,.72,0,1);display:grid}.page-grid:has(.toc.collapsed){grid-template-columns:48px minmax(0,1fr);gap:1.5rem}.toc{border-right:1px solid var(--border-subtle);padding-right:1rem;font-size:.9rem;transition:all .3s cubic-bezier(.32,.72,0,1);position:sticky;top:2rem}.toc.collapsed{border-right:none;width:48px;padding-right:0}.toc-collapse-button{background:var(--bg-color);border:1px solid var(--border-subtle);cursor:pointer;width:24px;height:24px;color:var(--text-main);z-index:10;border-radius:50%;justify-content:center;align-items:center;transition:all .2s;display:flex;position:absolute;top:0;right:-12px}.toc.collapsed .toc-collapse-button{left:12px;right:auto}.toc-collapse-button:hover{background:var(--code-bg);transform:scale(1.1);box-shadow:0 2px 8px #0000001a}.toc-content{opacity:1;transition:opacity .2s}.toc.collapsed .toc-content{opacity:0;pointer-events:none}.toc h3{text-transform:uppercase;letter-spacing:.08em;margin:0 0 .75rem;font-size:.85rem}.toc ul{gap:.4rem;margin:0;padding:0;list-style:none;display:grid}.toc a{color:var(--toc-link);text-decoration:none}.toc .depth-3{padding-left:.75rem}.toc .depth-4{padding-left:1.5rem}.prose h1,.prose h2,.prose h3,.prose h4{scroll-margin-top:6rem}.prose h1{margin-top:0;font-size:2.2rem}.prose h2{margin-top:2.5rem;font-size:1.6rem}.prose h3{margin-top:2rem;font-size:1.25rem}.prose .description{color:var(--text-muted);margin-top:-.5rem;margin-bottom:2rem;font-size:1.15rem;font-weight:400;line-height:1.5}.prose p,.prose ul,.prose ol,.prose blockquote{margin-bottom:1.2rem}.prose img{max-width:100%;height:auto;margin:1.5rem 0;display:block}.prose code{background:var(--code-bg);border-radius:4px;padding:.1rem .3rem;font-size:.95em}.prose pre{background:var(--pre-bg);padding:1rem;overflow-x:auto}.prose pre code{background:0 0;padding:0}.heading-anchor{opacity:0;margin-left:.5rem;text-decoration:none}.back-link{color:var(--text-light);align-items:center;margin-bottom:1.5rem;font-size:.95rem;text-decoration:none;transition:color .15s;display:inline-flex}.back-link:hover{color:var(--link-hover);text-decoration:underline}.toc h3:not(:first-child){margin-top:2rem}.week-grid{grid-template-columns:repeat(5,1fr);gap:.5rem;margin-bottom:1.5rem;display:grid}.week-grid-item{color:var(--text-main);border:1px solid var(--border-subtle);background:var(--bg-color);border-radius:6px;justify-content:center;align-items:center;padding:.5rem;font-size:.9rem;font-weight:500;text-decoration:none;transition:all .15s;display:flex}.week-grid-item:hover{border-color:var(--text-main);background:var(--code-bg);transform:translateY(-1px);box-shadow:0 2px 6px #00000014}.week-grid-item.active{background:var(--text-main);color:var(--bg-color);border-color:var(--text-main);font-weight:600}.week-grid-item.active:hover{box-shadow:none;transform:none}.prose h2:hover .heading-anchor,.prose h3:hover .heading-anchor,.prose h4:hover .heading-anchor{opacity:1}.callout{border:1px solid var(--callout-border-base);background:var(--callout-bg-base);border-left-width:4px;border-radius:6px;margin:1.5rem 0;padding:.9rem 1rem}.callout-title{text-transform:uppercase;letter-spacing:.08em;margin:0 0 .5rem;font-size:.75rem;font-weight:600}.callout-definition,.callout-quantity{border-color:var(--callout-def-border);background:var(--callout-def-bg)}.callout-theorem,.callout-lemma,.callout-corollary,.callout-law,.callout-principle{border-color:var(--callout-thm-border);background:var(--callout-thm-bg)}.callout-note{border-color:var(--callout-note-border);background:var(--callout-note-bg)}.callout-warning{border-color:var(--callout-warn-border);background:var(--callout-warn-bg)}.callout-proof{border-color:var(--callout-proof-border);background:var(--callout-proof-bg)}details.collapsible{margin:1.5rem 0}details.collapsible summary{cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:.4rem;font-size:.95rem;list-style:none;display:inline-flex}details.collapsible summary::-webkit-details-marker{display:none}details.collapsible summary:before{content:"▶";flex-shrink:0;font-size:.6rem;transition:transform .2s}details.collapsible[open] summary:before{transform:rotate(90deg)}.theme-toggle{background-color:var(--bg-color);width:2.2rem;height:2.2rem;color:var(--text-main);border:1px solid var(--border-subtle);cursor:pointer;border-radius:50%;justify-content:center;align-items:center;transition:all .2s;display:flex}.theme-toggle:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}.subscribe-button{background-color:var(--bg-color);width:2.2rem;height:2.2rem;color:var(--text-main);border:1px solid var(--border-subtle);cursor:pointer;border-radius:50%;justify-content:center;align-items:center;transition:all .2s;display:flex}.subscribe-button:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000001a}.modal-backdrop{z-index:200;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);background:#00000080;animation:.2s fadeIn;position:fixed;inset:0}.modal-container{z-index:201;background:var(--bg-color);border:1px solid var(--border-subtle);border-radius:12px;flex-direction:column;width:min(640px,90vw);max-height:85vh;animation:.3s cubic-bezier(.32,.72,0,1) slideIn;display:flex;position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);box-shadow:0 20px 60px #0000004d}@keyframes slideIn{0%{opacity:0;transform:translate(-50%,-48%)}to{opacity:1;transform:translate(-50%,-50%)}}.modal-header{border-bottom:1px solid var(--border-subtle);justify-content:space-between;align-items:center;padding:1.25rem 1.5rem;display:flex}.modal-header h2{margin:0;font-size:1.25rem;font-weight:600}.modal-close{border:1px solid var(--border-subtle);cursor:pointer;width:2rem;height:2rem;color:var(--text-main);background:0 0;border-radius:50%;justify-content:center;align-items:center;transition:all .2s;display:flex}.modal-close:hover{background:var(--code-bg);transform:rotate(90deg)}.modal-body{flex:1;padding:0;overflow-y:auto}.modal-body iframe{border:none;display:block}.mobile-toc-bar{z-index:100;background:var(--bg-color);border-top:1px solid var(--border-subtle);justify-content:center;padding:.6rem 1rem;display:none;position:fixed;bottom:0;left:0;right:0}.mobile-toc-trigger{border:1px solid var(--border-subtle);color:var(--text-main);cursor:pointer;background:0 0;border-radius:999px;align-items:center;gap:.5rem;padding:.45rem 1.1rem;font-size:.9rem;font-weight:500;transition:background .15s,border-color .15s;display:inline-flex}.mobile-toc-trigger:hover{background:var(--code-bg)}.mobile-toc-backdrop{z-index:101;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#00000059;animation:.2s fadeIn;position:fixed;inset:0}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.mobile-toc-drawer{z-index:102;background:var(--bg-color);border-top:1px solid var(--border-subtle);border-radius:16px 16px 0 0;max-height:75vh;transition:transform .3s cubic-bezier(.32,.72,0,1);position:fixed;bottom:0;left:0;right:0;overflow-y:auto;transform:translateY(100%)}.mobile-toc-drawer.open{transform:translateY(0)}.mobile-toc-drawer-handle{cursor:pointer;background:0 0;border:none;justify-content:center;width:100%;padding:.75rem 1rem .25rem;display:flex}.mobile-toc-handle-bar{background:var(--border-subtle);border-radius:999px;width:2.5rem;height:4px;display:block}.mobile-toc-drawer-content{padding:.5rem 1.5rem 2.5rem}.mobile-toc-section-label{text-transform:uppercase;letter-spacing:.08em;color:var(--text-light);margin:1.25rem 0 .6rem;font-size:.75rem;font-weight:600}.mobile-toc-list{gap:0;margin:0;padding:0;list-style:none;display:grid}.mobile-toc-list li{border-bottom:1px solid var(--border-subtle)}.mobile-toc-list li:first-child{border-top:1px solid var(--border-subtle)}.mobile-toc-list a{color:var(--text-main);padding:.75rem 0;font-size:.95rem;text-decoration:none;transition:color .15s;display:block}.mobile-toc-list a:hover{color:var(--accent,#8da4ff)}.mobile-toc-list .depth-3 a{color:var(--text-muted);padding-left:.75rem;font-size:.875rem}.mobile-toc-list .depth-4 a{color:var(--text-muted);padding-left:1.5rem;font-size:.85rem}.mobile-menu-backdrop{z-index:150;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#0006;animation:.2s fadeIn;position:fixed;inset:0}.mobile-menu-drawer{z-index:151;background:var(--bg-color);border-left:1px solid var(--border-subtle);flex-direction:column;width:min(320px,85vw);transition:transform .3s cubic-bezier(.32,.72,0,1);display:flex;position:fixed;top:0;bottom:0;right:0;overflow-y:auto;transform:translate(100%);box-shadow:-4px 0 20px #00000026}.mobile-menu-drawer.open{transform:translate(0)}.mobile-menu-header{border-bottom:1px solid var(--border-subtle);flex-shrink:0;justify-content:space-between;align-items:center;padding:1.25rem 1.5rem;display:flex}.mobile-menu-title{letter-spacing:.02em;font-size:1rem;font-weight:600}.mobile-menu-close{border:1px solid var(--border-subtle);cursor:pointer;width:2rem;height:2rem;color:var(--text-main);background:0 0;border-radius:50%;justify-content:center;align-items:center;transition:all .2s;display:flex}.mobile-menu-close:hover{background:var(--code-bg);transform:rotate(90deg)}.mobile-menu-content{flex:1;padding:.5rem 0;overflow-y:auto}.mobile-menu-section{padding:.75rem 0}.mobile-menu-section-label{text-transform:uppercase;letter-spacing:.08em;color:var(--text-light);margin:0 1.5rem .6rem;font-size:.75rem;font-weight:600}.mobile-menu-list{margin:0;padding:0;list-style:none}.mobile-menu-list li{border-bottom:1px solid var(--border-subtle)}.mobile-menu-list li:first-child{border-top:1px solid var(--border-subtle)}.mobile-menu-list a{color:var(--text-main);padding:.875rem 1.5rem;font-size:.95rem;text-decoration:none;transition:background .15s;display:block}.mobile-menu-list a:hover{background:var(--code-bg)}.mobile-menu-actions{border-top:1px solid var(--border-subtle);gap:1rem;margin-top:1rem;padding:1.5rem 1.5rem 2rem;display:flex}@media (max-width:900px){.page-grid{grid-template-columns:minmax(0,1fr);padding-bottom:5rem}.toc{display:none}.mobile-toc-bar{display:flex!important}.site-nav-desktop{display:none}.mobile-menu-button{display:flex}.week-grid-item{min-height:2.5rem;padding:.65rem;font-size:.95rem}}.subject-landing{flex-direction:column;gap:3rem;padding-top:2rem;display:flex}.subject-hero{border-left:4px solid var(--accent,#8da4ff);background:color-mix(in srgb,var(--accent,#8da4ff)8%,var(--bg-color));border-radius:0 8px 8px 0;padding:2rem 2rem 2rem 1.75rem}.subject-hero-inner{max-width:720px}.subject-hero h1{margin:.5rem 0 0;font-size:2.4rem;line-height:1.2}.semester-badge{letter-spacing:.08em;text-transform:uppercase;color:var(--accent,#8da4ff);border:1px solid var(--accent,#8da4ff);border-radius:999px;margin-bottom:.5rem;padding:.2rem .7rem;font-size:.75rem;font-weight:600;display:inline-block}.subject-description{color:var(--text-muted);margin:.75rem 0 0;font-size:1rem;line-height:1.6}.subject-intro{margin-top:-1rem}.subject-pages h2,.subject-weeks-section h2{text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted);margin:0 0 1rem;font-size:1rem;font-weight:600}.subject-pages-list{flex-wrap:wrap;gap:.6rem;display:flex}.subject-page-link{border:1px solid var(--border-subtle);color:var(--text-main);border-radius:6px;align-items:center;gap:.4rem;padding:.45rem .85rem;font-size:.9rem;text-decoration:none;transition:border-color .15s,box-shadow .15s,transform .15s;display:inline-flex}.subject-page-link:hover{border-color:var(--accent,#8da4ff);text-decoration:none;transform:translateY(-1px);box-shadow:0 2px 8px #0000000f}.page-link-icon{font-size:.95rem;line-height:1}.weeks-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1rem;display:grid}.week-card{color:var(--text-main);border:1px solid var(--border-subtle);border-top:3px solid var(--accent,#8da4ff);background:var(--bg-color);border-radius:8px;flex-direction:column;gap:.4rem;padding:1.25rem 1.25rem 1rem;text-decoration:none;transition:box-shadow .2s,transform .2s,border-color .2s;display:flex}.week-card:hover{text-decoration:none;transform:translateY(-3px);box-shadow:0 6px 20px #00000014}.week-card-header{justify-content:space-between;align-items:center;gap:.5rem;display:flex}.week-card-number{text-transform:uppercase;letter-spacing:.07em;color:var(--accent,#8da4ff);font-size:.75rem;font-weight:600}.week-card-date{color:var(--text-light);font-size:.75rem}.week-card-title{margin:.25rem 0 0;font-size:1.05rem;font-weight:600;line-height:1.35}.week-card-desc{color:var(--text-muted);flex:1;margin:0;font-size:.875rem;line-height:1.5}.week-card-footer{border-top:1px solid var(--border-subtle);margin-top:.75rem;padding-top:.6rem}.week-card-topics{color:var(--text-light);font-size:.75rem}.topic-list{gap:0;margin:0;padding:0;list-style:none;display:grid}.topic-list-item{border-bottom:1px solid var(--border-subtle);padding:1rem 0}.topic-list-item:first-child{border-top:1px solid var(--border-subtle)}.topic-list-link{color:var(--text-main);font-size:1rem;font-weight:600;text-decoration:none;transition:color .15s}.topic-list-link:hover{color:var(--accent,#8da4ff)}.topic-list-desc{color:var(--text-muted);margin:.3rem 0 0;font-size:.875rem;line-height:1.5}.empty-state{color:var(--text-muted);font-size:.95rem}.subjects-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.25rem;margin-top:1.5rem;display:grid}.subject-card{color:var(--text-main);border:1px solid var(--border-subtle);border-left:4px solid var(--accent,#8da4ff);background:var(--bg-color);border-radius:8px;flex-direction:column;gap:.4rem;padding:1.25rem 1.25rem 1rem;text-decoration:none;transition:box-shadow .2s,transform .2s;display:flex}.subject-card:hover{text-decoration:none;transform:translateY(-3px);box-shadow:0 6px 20px #00000014}.subject-card-title{margin:0;font-size:1.15rem;font-weight:600}.subject-card-semester{color:var(--accent,#8da4ff);letter-spacing:.06em;text-transform:uppercase;font-size:.75rem;font-weight:600}.subject-card-desc{color:var(--text-muted);margin:0;font-size:.875rem;line-height:1.5}.search-trigger{background:var(--code-bg);border:1px solid var(--border-subtle);color:var(--text-muted);cursor:pointer;white-space:nowrap;border-radius:6px;align-items:center;gap:.45rem;padding:.35rem .7rem;font-size:.85rem;transition:border-color .15s,box-shadow .15s;display:inline-flex}.search-trigger:hover{border-color:color-mix(in srgb,var(--text-muted)40%,transparent);box-shadow:0 2px 6px #0000000f}.search-trigger-text{font-size:.85rem}.search-trigger-kbd{background:var(--bg-color);border:1px solid var(--border-subtle);color:var(--text-light);border-radius:4px;padding:.05rem .35rem;font-family:inherit;font-size:.72rem}@media (max-width:600px){.search-trigger-text,.search-trigger-kbd{display:none}.search-trigger{border-radius:50%;justify-content:center;width:2.2rem;height:2.2rem;padding:0}}.search-backdrop{z-index:300;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);background:#00000073;animation:.15s fadeIn;position:fixed;inset:0}.search-modal{z-index:301;background:var(--bg-color);border:1px solid var(--border-subtle);border-radius:12px;flex-direction:column;width:min(640px,92vw);max-height:72vh;animation:.2s cubic-bezier(.32,.72,0,1) searchSlideIn;display:flex;position:fixed;top:12vh;left:50%;overflow:hidden;transform:translate(-50%);box-shadow:0 24px 64px #00000040}@keyframes searchSlideIn{0%{opacity:0;transform:translate(-50%)translateY(-8px)}to{opacity:1;transform:translate(-50%)translateY(0)}}.search-input-wrap{border-bottom:1px solid var(--border-subtle);flex-shrink:0;align-items:center;gap:.6rem;padding:.9rem 1.1rem;display:flex}.search-icon-inline{color:var(--text-light);flex-shrink:0}.search-input{color:var(--text-main);background:0 0;border:none;outline:none;flex:1;font-family:inherit;font-size:1rem}.search-input::placeholder{color:var(--text-light)}.search-clear{cursor:pointer;color:var(--text-light);background:0 0;border:none;border-radius:4px;padding:.2rem .4rem;font-size:.8rem;line-height:1;transition:color .15s,background .15s}.search-clear:hover{color:var(--text-main);background:var(--code-bg)}.search-results{flex:1;min-height:4rem;overflow-y:auto}.search-result-list{margin:0;padding:.4rem 0;list-style:none}.search-result-item{color:var(--text-main);cursor:pointer;border-radius:0;flex-direction:column;gap:.2rem;padding:.75rem 1.1rem;text-decoration:none;transition:background .1s;display:flex}.search-result-item:hover,.search-result-item.active{background:var(--code-bg);text-decoration:none}.search-result-meta{align-items:center;gap:.5rem;margin-bottom:.1rem;display:flex}.search-result-type{text-transform:uppercase;letter-spacing:.07em;color:var(--accent,#8da4ff);background:color-mix(in srgb,var(--accent,#8da4ff)12%,transparent);border-radius:4px;padding:.1rem .45rem;font-size:.68rem;font-weight:600}.search-result-subject{color:var(--text-light);font-size:.78rem}.search-result-title{font-size:.95rem;font-weight:600;line-height:1.3}.search-result-desc{color:var(--text-muted);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin:.15rem 0 0;font-size:.82rem;line-height:1.45;display:-webkit-box;overflow:hidden}.search-empty{color:var(--text-muted);margin:0;padding:1.5rem 1.1rem;font-size:.9rem}.search-hint{color:var(--text-light)}.search-footer{border-top:1px solid var(--border-subtle);color:var(--text-light);flex-shrink:0;gap:1.2rem;padding:.55rem 1.1rem;font-size:.75rem;display:flex}.search-footer kbd{background:var(--code-bg);border:1px solid var(--border-subtle);border-radius:4px;margin-right:.2rem;padding:.05rem .35rem;font-family:inherit;font-size:.72rem;display:inline-block}