:root{--nav-h: 77px;--bar-h: 66px;--bg: #000000;--bg-elevated: #0a0a0a;--bg-inset: #111111;--bg-hover: #171717;--border: #262626;--border-strong: #404040;--text: #ffffff;--text-muted: #9ca3af;--text-faint: #6b7280;--code-bg: #171717;--accent: #ffffff;--accent-soft: rgba(255, 255, 255, .05);--reg: var(--text-muted);--clf: var(--text-muted);--clu: var(--text-muted);--arl: var(--text-muted);--dr: var(--text-muted);--ens: var(--text-muted);--ts: var(--text-muted);--fnd: var(--text-muted);--cnn: var(--text-muted);--seq: var(--text-muted);--att: var(--text-muted);--gen: var(--text-muted);--rl: var(--text-muted);--front: var(--text-muted);--font-display: "Inter", ui-sans-serif, system-ui, sans-serif;--font-body: "Inter", ui-sans-serif, system-ui, sans-serif;--font-mono: ui-monospace, SFMono-Regular, Menlo, "Cascadia Code", monospace}.sheet-shell{padding-top:var(--nav-h)}.sheet-bar{position:sticky;top:var(--nav-h);z-index:40;display:flex;align-items:center;gap:16px;height:var(--bar-h);padding:0 24px;background:#000;border-bottom:1px solid var(--border)}.sheet-brand{display:flex;flex-direction:column;align-items:flex-start;gap:2px;background:none;border:none;padding:0;cursor:pointer}.sheet-title{font-size:15px;font-weight:500;letter-spacing:-.01em;color:var(--text);transition:opacity .3s ease}.sheet-brand:hover .sheet-title{opacity:.6}.sheet-sub{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--text-faint)}.topbar-spacer{flex:1}.search-wrap{position:relative;width:100%;max-width:300px}.search-wrap input{width:100%;padding:9px 14px 9px 36px;background:var(--bg-inset);border:1px solid var(--border);color:var(--text);font-family:var(--font-body);font-size:13px;outline:none;transition:border-color .2s ease}.search-wrap input::placeholder{color:var(--text-faint)}.search-wrap input:focus{border-color:var(--border-strong)}.search-wrap svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);width:15px;height:15px;color:var(--text-faint);pointer-events:none}.hamburger{display:none;width:38px;height:38px;border:1px solid var(--border);background:transparent;color:var(--text);cursor:pointer;align-items:center;justify-content:center}.sheet-back{flex-shrink:0;display:inline-flex;align-items:center;gap:7px;padding:9px 14px;border:1px solid var(--border);color:var(--text-muted);font-family:var(--font-mono);font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;text-decoration:none;white-space:nowrap;transition:border-color .3s ease,color .3s ease}.sheet-back:hover{border-color:var(--border-strong);color:var(--text)}.sheet-layout{display:grid;grid-template-columns:288px 1fr}.sidebar{border-right:1px solid var(--border);background:#000;padding:20px 12px 60px;position:sticky;top:calc(var(--nav-h) + var(--bar-h));height:calc(100vh - var(--nav-h) - var(--bar-h));overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--border) transparent}.sidebar::-webkit-scrollbar{width:8px}.sidebar::-webkit-scrollbar-thumb{background:var(--border)}.fam-group{margin-bottom:2px}.fam-header{display:flex;align-items:center;gap:10px;width:100%;text-align:left;padding:9px 10px;background:none;border:none;cursor:pointer;color:var(--text);font-family:var(--font-body);transition:background .2s ease}.fam-header:hover{background:var(--bg-hover)}.fam-dot{width:6px;height:6px;border-radius:50%;background:var(--text-faint);flex-shrink:0}.fam-name{font-size:12px;font-weight:500;letter-spacing:.02em;flex:1}.fam-count{font-family:var(--font-mono);font-size:10px;color:var(--text-faint)}.fam-chevron{width:13px;height:13px;color:var(--text-faint);transition:transform .2s ease;flex-shrink:0}.fam-group.collapsed .fam-chevron{transform:rotate(-90deg)}.fam-items{overflow:hidden;max-height:1200px;transition:max-height .3s ease}.fam-group.collapsed .fam-items{max-height:0}.nav-item{display:flex;align-items:baseline;gap:9px;width:100%;text-align:left;padding:7px 10px 7px 26px;background:none;border:none;border-left:2px solid transparent;cursor:pointer;color:var(--text-muted);font-family:var(--font-body);font-size:12.5px;transition:background .2s ease,color .2s ease}.nav-item .tag{font-family:var(--font-mono);font-size:9px;color:var(--text-faint);flex-shrink:0}.nav-item:hover{background:var(--bg-hover);color:var(--text)}.nav-item.active{background:var(--bg-hover);border-left-color:var(--text);color:var(--text);font-weight:500}.nav-item.active .tag{color:var(--text)}.nav-item.hidden-item{display:none}.sheet-main{padding:44px 48px 120px;max-width:900px}.topic{display:none}.topic.active{display:block;animation:sheetFade .4s cubic-bezier(.16,1,.3,1)}@keyframes sheetFade{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.eyebrow{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--text-faint)!important;margin-bottom:14px}.eyebrow .sep{color:var(--border-strong)}.topic h1{font-family:var(--font-display);font-weight:300;font-size:clamp(2rem,4vw,2.6rem);line-height:1.1;letter-spacing:-.02em;margin:0 0 14px;color:var(--text)}.tagline{font-size:1.125rem;font-weight:300;color:var(--text-muted);margin:0 0 36px;max-width:62ch;line-height:1.6}.block{margin:0 0 22px;padding:24px 26px;background:var(--bg-elevated);border:1px solid var(--border)}.block h3{font-family:var(--font-mono);font-weight:500;font-size:.72rem;text-transform:uppercase;letter-spacing:.18em;margin:0 0 16px;color:var(--text-faint)}.block p{margin:0 0 14px;color:var(--text-muted);font-size:.975rem;line-height:1.75}.block p:last-child{margin-bottom:0}.block ul,.block ol{margin:0 0 14px;padding-left:22px;font-size:.975rem;color:var(--text-muted);line-height:1.7}.block li{margin-bottom:8px}.block li:last-child{margin-bottom:0}.block strong,.example strong,.callout strong,.result strong,.definition strong{color:var(--text);font-weight:500}code{font-family:var(--font-mono);font-size:.86em;color:var(--text);background:var(--code-bg);border:1px solid var(--border);padding:1px 6px}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:22px}.pros h4,.cons h4{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;margin:0 0 12px}.pros h4{color:var(--text)}.cons h4{color:var(--text-faint)}.pros ul,.cons ul{padding-left:18px;margin:0;font-size:.9rem;color:var(--text-muted);line-height:1.65}.pros li,.cons li{margin-bottom:8px}.definition{display:flex;gap:16px;align-items:flex-start;margin:0 0 22px;padding:20px 24px;background:var(--bg-inset);border:1px solid var(--border)}.definition .def-mark{font-family:var(--font-display);font-weight:600;font-size:34px;line-height:1;color:var(--border-strong);flex-shrink:0;margin-top:-2px;user-select:none}.definition .def-body{flex:1}.definition .def-label{display:block;font-family:var(--font-mono);font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;color:var(--text-faint);margin-bottom:8px}.definition p{margin:0;font-size:1rem;font-style:italic;font-weight:300;color:#d1d5db;line-height:1.65}.callout{background:var(--accent-soft);border:1px solid var(--border);border-left:2px solid var(--text);padding:16px 20px;margin:0 0 22px;font-size:.95rem;color:#d1d5db;line-height:1.7}.example{margin:0 0 22px;border:1px solid var(--border);overflow:hidden;background:var(--bg-elevated)}.example .ex-head{display:flex;align-items:center;gap:10px;padding:13px 24px;background:var(--bg-inset);border-bottom:1px solid var(--border)}.example .ex-head .ex-icon{width:18px;height:18px;border:1px solid var(--border-strong);flex-shrink:0;display:flex;align-items:center;justify-content:center}.example .ex-head .ex-icon svg{width:11px;height:11px;stroke:var(--text)}.example .ex-head span{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;color:var(--text-muted)}.example .ex-body{padding:22px 24px}.example .ex-body p{margin:0 0 14px;font-size:.95rem;color:var(--text-muted);line-height:1.75}.example .ex-body p:last-child{margin-bottom:0}.example .ex-body ul,.example .ex-body ol{margin:0 0 14px;padding-left:22px;font-size:.95rem;color:var(--text-muted);line-height:1.7}.example .ex-body li{margin-bottom:6px}.result{margin-top:16px;padding:14px 18px;background:var(--accent-soft);border-left:2px solid var(--text);font-size:.95rem;color:#d1d5db;line-height:1.7}.diagram{margin:0 0 22px;padding:22px 24px;background:var(--bg-elevated);border:1px solid var(--border)}.diagram .dia-label{display:block;font-family:var(--font-mono);font-size:.62rem;letter-spacing:.16em;text-transform:uppercase;color:var(--text-faint);margin-bottom:16px}.diagram svg{width:100%;height:auto;display:block}.diagram .dia-caption{margin:16px 0 0;font-family:var(--font-mono);font-size:.78rem;color:var(--text-faint);text-align:center;line-height:1.6}table{width:100%;border-collapse:collapse;margin:12px 0 16px;font-size:.88rem}th,td{padding:8px 14px;border:1px solid var(--border);text-align:left;color:var(--text-muted)}th{color:var(--text);font-family:var(--font-mono);font-size:.66rem;text-transform:uppercase;letter-spacing:.1em;font-weight:500;background:var(--bg-inset)}.katex-display{margin:16px 0!important;padding:16px 18px;background:var(--bg-inset);border:1px solid var(--border);overflow-x:auto;overflow-y:hidden}.katex{font-size:1.02em;color:var(--text)}.topic-nav{display:flex;justify-content:space-between;gap:16px;margin-top:44px;padding-top:26px;border-top:1px solid var(--border)}.topic-nav button{display:flex;flex-direction:column;gap:5px;padding:14px 18px;border:1px solid var(--border);background:var(--bg-elevated);cursor:pointer;max-width:47%;text-align:left;transition:border-color .3s ease}.topic-nav button:hover{border-color:var(--border-strong)}.topic-nav button.next{text-align:right;margin-left:auto;align-items:flex-end}.topic-nav .dir{font-family:var(--font-mono);font-size:.62rem;text-transform:uppercase;letter-spacing:.14em;color:var(--text-faint)}.topic-nav .name{font-size:.9rem;font-weight:500;color:var(--text)}.welcome-hero{margin-bottom:40px}.welcome-hero h1{font-family:var(--font-display);font-weight:300;font-size:clamp(2.25rem,5vw,3rem);letter-spacing:-.025em;line-height:1.05;margin:0 0 18px;color:var(--text)}.welcome-hero p{font-size:1.05rem;font-weight:300;color:var(--text-muted);max-width:66ch;margin:0 0 12px;line-height:1.7}.fam-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:32px}.fam-card{text-align:left;border:1px solid var(--border);background:var(--bg-elevated);padding:20px 22px;cursor:pointer;transition:border-color .3s ease}.fam-card:hover{border-color:var(--border-strong)}.fam-card .ft{display:block;font-weight:500;font-size:1rem;color:var(--text);margin-bottom:8px}.fam-card p{margin:0;font-size:.85rem;color:var(--text-muted);line-height:1.6}.fam-card .fc{display:block;margin-top:12px;font-family:var(--font-mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-faint)}.sheet-main a{color:var(--text);text-decoration:underline;text-decoration-color:var(--border-strong);text-underline-offset:3px;transition:text-decoration-color .3s ease}.sheet-main a:hover{text-decoration-color:var(--text)}.sheet-footer{border-top:1px solid var(--border);padding:24px 48px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;font-size:.78rem;color:var(--text-faint)}.sheet-footer a{color:var(--text-muted);text-decoration:underline;text-decoration-color:var(--border-strong);text-underline-offset:3px;transition:text-decoration-color .3s ease,color .3s ease}.sheet-footer a:hover{color:var(--text);text-decoration-color:var(--text)}.overlay{display:none;position:fixed;inset:0;background:#0009;z-index:45}.overlay.show{display:block}@media(max-width:900px){.sheet-layout{grid-template-columns:1fr}.hamburger{display:flex}.sidebar{position:fixed;left:0;top:0;height:100vh;width:288px;z-index:50;padding-top:24px;transform:translate(-100%);transition:transform .3s cubic-bezier(.16,1,.3,1)}.sidebar.open{transform:translate(0)}.sheet-main{padding:32px 22px 90px}.two-col,.fam-grid{grid-template-columns:1fr}.sheet-title{font-size:13.5px}.search-wrap{max-width:180px}.sheet-back-label{display:none}.sheet-back{padding:9px 11px}.sheet-footer{padding:22px}}@media(max-width:560px){.sheet-sub,.sheet-back{display:none}}@media(prefers-reduced-motion:reduce){.topic.active{animation:none}}