.nt-lib,.nt-sheet{--nt-tint:var(--note-tint);--nt-panel:var(--card-glass);--nt-line:var(--border);--nt-soft:color-mix(in oklab,var(--text) 4%,transparent);--nt-soft-hi:color-mix(in oklab,var(--text) 9%,transparent);--nt-dim:var(--text-muted);--nt-faint:var(--text-muted);--nt-shadow:var(--shadow-1);--nt-definition:var(--note-kind-definition);--nt-formula:var(--note-kind-formula);--nt-example:var(--note-kind-example);--nt-misconception:var(--note-kind-misconception);--nt-key-fact:var(--note-kind-key-fact);--nt-procedure:var(--note-kind-procedure);--nt-raw:var(--note-kind-raw);--nt-star:var(--feedback-caution-700);--nt-jump:var(--feedback-info-700);--nt-danger:var(--bad)}.dark .nt-lib,.dark .nt-sheet{--nt-faint:color-mix(in oklab,var(--on-dark-faint) 70%,var(--text-muted));--nt-shadow:0 8px 32px color-mix(in srgb,var(--shade-ink) 40%,transparent);--nt-star:var(--feedback-caution-300);--nt-jump:var(--feedback-info-200);--nt-danger:var(--feedback-danger-300)}.nt-lib{height:100%;flex-direction:column;color:var(--text)}.nt-cols,.nt-lib{min-height:0;display:flex}.nt-cols{flex:1}.nt-lib :focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:10px}.nt-mono{font-family:var(--font-mono),ui-monospace,SFMono-Regular,Menlo,monospace;font-variant-numeric:tabular-nums}.nt-eyebrow{font-family:var(--font-mono),ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--nt-faint);white-space:nowrap}@keyframes nt-rise{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}@keyframes nt-spin{to{transform:rotate(1turn)}}@keyframes nt-pulse{0%,to{opacity:.35}50%{opacity:1}}.nt-rise{animation:nt-rise .24s cubic-bezier(.22,1,.36,1)}.nt-spinner{display:inline-block;flex-shrink:0;width:14px;height:14px;border-radius:9999px;border:2px solid;border-top:2px solid transparent;animation:nt-spin .8s linear infinite}@media (prefers-reduced-motion:reduce){.nt-rise,.nt-skeleton,.nt-spinner{animation:none}}.nt-rail{flex-shrink:0;width:250px;display:none;flex-direction:column;min-height:0;border-right:1px solid var(--nt-line);background:var(--nt-soft)}@media (min-width:1024px){.nt-rail{display:flex}}.nt-rail-head{flex-shrink:0;padding:16px 14px 12px}.nt-rail-sub{font-size:12px;color:var(--nt-dim)}.nt-rail-sub--under{margin-top:8px;padding:0 2px}.nt-rail-scroll{flex:1;min-height:0;overflow-y:auto;padding:0 8px 14px}.nt-rail-section{padding:10px 6px 8px}.nt-subject{width:100%;display:flex;align-items:center;gap:9px;min-height:44px;padding:0 11px;border-radius:13px;border:1px solid var(--nt-line);background:var(--nt-soft-hi);color:var(--text);font-family:inherit;cursor:pointer;text-align:left;transition:background .16s ease}.nt-subject:hover{background:color-mix(in oklab,var(--text) 13%,transparent)}.nt-subject-icon{flex-shrink:0;display:flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:8px;background:color-mix(in srgb,var(--nt-tint) 16%,transparent);border:1px solid color-mix(in srgb,var(--nt-tint) 30%,transparent);color:var(--nt-tint)}.nt-subject-body{flex:1;min-width:0}.nt-subject-name{display:block;font-size:13.5px;font-weight:700;line-height:1.2;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-subject-count{display:block;font-size:12px;color:var(--nt-dim)}.nt-subject-menu{position:absolute;z-index:30;left:12px;right:12px;margin-top:4px;padding:5px;border-radius:14px;border:1px solid var(--nt-line);background:var(--surface-solid);box-shadow:0 18px 40px color-mix(in srgb,var(--popover-shadow-ink) 22%,transparent);display:flex;flex-direction:column;gap:2px;max-height:260px;overflow-y:auto}.nt-subject-option{display:flex;align-items:center;gap:8px;min-height:44px;padding:0 10px;border-radius:10px;border:none;background:transparent;color:var(--text);font-family:inherit;font-size:13px;cursor:pointer;text-align:left}.nt-subject-option:hover{background:var(--nt-soft-hi)}.nt-subject-option[aria-selected=true]{background:color-mix(in srgb,var(--nt-tint) 14%,transparent);font-weight:700}.nt-subject-option>span:first-child{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-nav{width:100%;display:flex;align-items:center;gap:10px;min-height:44px;padding:6px 8px;border-radius:11px;border:1px solid transparent;background:transparent;color:var(--nt-dim);font-family:inherit;cursor:pointer;text-align:left;transition:background .14s ease,color .14s ease}.nt-nav:hover{background:var(--nt-soft-hi);color:var(--text)}.nt-nav[aria-current=true]{border-color:color-mix(in srgb,var(--nt-tint) 30%,transparent);background:color-mix(in srgb,var(--nt-tint) 14%,transparent);color:var(--text)}.nt-nav-badge{flex-shrink:0;display:flex;align-items:center;justify-content:center;width:22px;height:22px;border-radius:7px;background:var(--nt-soft-hi);font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;color:var(--nt-dim)}.nt-nav[aria-current=true] .nt-nav-badge{background:color-mix(in srgb,var(--nt-tint) 26%,transparent);color:var(--text)}.nt-nav-label{flex:1;min-width:0;font-size:13px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-nav[aria-current=true] .nt-nav-label{font-weight:700}.nt-nav-count{flex-shrink:0;font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;color:var(--nt-dim)}.nt-nav-mark{flex-shrink:0;color:var(--nt-raw);display:flex}.nt-list{flex:1 1 100%;min-width:0;display:flex;flex-direction:column;min-height:0;border-right:1px solid var(--nt-line)}@media (min-width:1024px){.nt-list{flex:0 0 360px;width:360px}}.nt-list-head{flex-shrink:0;padding:13px 14px 10px;border-bottom:1px solid var(--nt-line)}.nt-mobile-head{display:block;margin-bottom:12px}@media (min-width:1024px){.nt-list-head--phone,.nt-mobile-head{display:none}}.nt-list-head--phone .nt-mobile-head{margin-bottom:0}.nt-chip-row{display:flex;align-items:center;gap:7px;margin-top:10px;overflow-x:auto;scrollbar-width:none;padding-bottom:2px}.nt-chip-row::-webkit-scrollbar{display:none}.nt-search{display:flex;align-items:center;gap:8px;height:44px;padding:0 11px;border-radius:12px;border:1px solid var(--nt-line);background:var(--surface-solid);color:var(--nt-dim)}.nt-search:focus-within{border-color:color-mix(in srgb,var(--nt-tint) 45%,transparent)}.nt-search input{flex:1;min-width:0;border:none;background:transparent;outline:none;font-family:inherit;font-size:14px;color:var(--text)}.nt-search input::-moz-placeholder{color:var(--nt-dim)}.nt-search input::placeholder{color:var(--nt-dim)}.nt-kbd{flex-shrink:0;font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;padding:2px 6px;border-radius:6px;background:var(--nt-soft-hi);color:var(--nt-dim)}@media (hover:none),(max-width:1023.98px){.nt-kbd{display:none}}.nt-pill{flex-shrink:0;display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 14px;border-radius:9999px;border:1px solid var(--nt-line);background:var(--surface-solid);color:var(--nt-dim);font-family:inherit;font-size:13px;font-weight:600;cursor:pointer;white-space:nowrap;transition:background .14s ease,color .14s ease,border-color .14s ease}.nt-pill:hover{background:var(--nt-soft-hi);color:var(--text)}.nt-pill[aria-pressed=true]{border-color:color-mix(in srgb,var(--nt-tint) 40%,transparent);background:color-mix(in srgb,var(--nt-tint) 16%,transparent);color:var(--text);font-weight:700}.nt-pill--icon{width:44px;padding:0;justify-content:center}.nt-dot{width:6px;height:6px;border-radius:9999px;background:currentColor;flex-shrink:0}.nt-seg{display:flex;gap:3px;padding:3px;border-radius:12px;background:var(--nt-soft-hi);width:100%}.nt-seg button{flex:1;min-height:44px;border-radius:9px;border:1px solid transparent;background:transparent;color:color-mix(in srgb,var(--nt-dim) 70%,var(--text));font-family:inherit;font-size:13px;font-weight:600;cursor:pointer}.nt-seg button[aria-pressed=true]{border-color:var(--nt-line);background:var(--surface-solid);color:var(--text);font-weight:700;box-shadow:var(--nt-shadow)}.nt-context{display:flex;gap:8px;padding:9px 14px;border-bottom:1px solid var(--nt-line);background:var(--nt-soft);font-weight:700}.nt-context,.nt-mini{flex-shrink:0;align-items:center;font-size:12px;color:var(--nt-dim)}.nt-mini{display:inline-flex;gap:6px;min-height:44px;padding:0 12px;border-radius:12px;border:1px solid var(--nt-line);background:var(--surface-solid);font-family:inherit;font-weight:600;cursor:pointer}.nt-mini:hover{color:var(--text);background:var(--nt-soft-hi)}.nt-mini--scope{flex-shrink:1;min-width:0}.nt-mini--scope[aria-pressed=true]{border-color:color-mix(in srgb,var(--nt-tint) 40%,transparent);background:color-mix(in srgb,var(--nt-tint) 16%,transparent);color:var(--text)}.nt-section-head{margin:12px 4px 8px;font-size:12px;font-weight:700;color:var(--nt-dim);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-rows>div:first-child>.nt-section-head{margin-top:4px}.nt-rows{flex:1;min-height:0;overflow-y:auto;padding:8px 8px calc(8px + env(safe-area-inset-bottom))}.nt-row{position:relative;display:block;width:100%;text-align:left;padding:11px 12px;margin-bottom:5px;border-radius:14px;border:1px solid var(--nt-line);background:var(--nt-soft);color:inherit;font-family:inherit;cursor:pointer;transition:background .14s ease,border-color .14s ease}.nt-row:hover{background:var(--nt-soft-hi);border-color:color-mix(in srgb,var(--nt-tint) 22%,transparent)}.nt-row[aria-current=true]{border-color:color-mix(in srgb,var(--nt-tint) 32%,transparent);background:color-mix(in srgb,var(--nt-tint) 12%,transparent);box-shadow:var(--nt-shadow)}.nt-row--raw{border-color:color-mix(in oklab,var(--nt-raw) 24%,transparent);background:color-mix(in oklab,var(--nt-raw) 7%,transparent)}.nt-row--raw:hover{background:color-mix(in oklab,var(--nt-raw) 12%,transparent)}.nt-row-edge{position:absolute;left:0;top:14px;bottom:14px;width:3px;border-radius:9999px;background:var(--nt-kind,var(--nt-tint))}.nt-row-top{display:flex;align-items:center;gap:6px;margin-bottom:4px}.nt-kind{display:inline-flex;align-items:center;gap:4px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--nt-kind,var(--nt-dim))}.nt-kind,.nt-row-date{font-family:var(--font-mono),ui-monospace,monospace;font-size:12px}.nt-row-date{flex-shrink:0;margin-left:auto;color:var(--nt-dim)}.nt-row-title{font-size:14px;font-weight:700;line-height:1.3;margin-bottom:4px;text-wrap:pretty}.nt-row-excerpt{font-size:12px;line-height:1.5;color:var(--nt-dim);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.nt-row-excerpt--formula{font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;color:var(--nt-procedure);display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-row-meta{display:flex;align-items:center;gap:9px;margin-top:7px;font-size:12px;color:var(--nt-dim)}.nt-row-meta>span{display:inline-flex;align-items:center;gap:3px;min-width:0}.nt-row-meta .nt-row-topic{max-width:150px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-row-cta{display:inline-flex;align-items:center;gap:6px;min-height:44px;margin-top:8px;padding:0 14px;border-radius:9999px;border:1px solid color-mix(in oklab,var(--nt-raw) 30%,transparent);background:color-mix(in oklab,var(--nt-raw) 14%,transparent);color:var(--nt-raw);font-family:inherit;font-size:13px;font-weight:700;cursor:pointer}.nt-row-cta:disabled{cursor:default;opacity:.7}.nt-reader{flex:1 1 100%;min-width:0;display:flex;flex-direction:column;min-height:0}.nt-bar{flex-shrink:0;display:flex;align-items:center;gap:8px;min-height:52px;padding:7px 14px;border-bottom:1px solid var(--nt-line);background:var(--nt-panel);backdrop-filter:blur(20px) saturate(140%);-webkit-backdrop-filter:blur(20px) saturate(140%)}@media (min-width:1024px){.nt-bar{padding:7px 20px}}.nt-bar-crumb{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-act{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;gap:5px;width:44px;height:44px;border-radius:9999px;border:1px solid var(--nt-line);background:var(--surface-solid);color:var(--nt-dim);font-family:inherit;font-size:12px;font-weight:600;cursor:pointer;transition:background .14s ease,color .14s ease}.nt-act:hover:not(:disabled){background:var(--nt-soft-hi);color:var(--text)}.nt-act:disabled{opacity:.4;cursor:default}.nt-act--wide{width:auto;padding:0 12px}.nt-act--on{border-color:color-mix(in oklab,var(--nt-star) 40%,transparent);background:color-mix(in oklab,var(--nt-star) 14%,transparent);color:var(--nt-star)}.nt-act--on:hover:not(:disabled){background:color-mix(in oklab,var(--nt-star) 24%,transparent);color:var(--nt-star)}.nt-menu-anchor{position:relative;flex-shrink:0;display:inline-flex}.nt-menu{position:absolute;z-index:40;top:calc(100% + 6px);right:0;min-width:200px;padding:6px;border-radius:14px;border:1px solid var(--nt-line);background:var(--surface-solid);box-shadow:0 18px 40px color-mix(in srgb,var(--popover-shadow-ink) 22%,transparent);display:flex;flex-direction:column;gap:2px}.nt-menu-item{display:flex;align-items:center;gap:10px;min-height:44px;padding:0 12px;border-radius:10px;border:none;background:transparent;color:var(--text);font-family:inherit;font-size:14px;font-weight:600;cursor:pointer;text-align:left}.nt-menu-item:hover{background:var(--nt-soft-hi)}.nt-menu-item--danger{color:var(--nt-danger)}.nt-menu-item--danger:hover{background:color-mix(in oklab,var(--nt-danger) 12%,transparent)}.nt-bar-sep{flex-shrink:0;width:1px;height:20px;background:var(--nt-line)}.nt-scroll{flex:1;min-height:0;overflow-y:auto;padding:24px 18px calc(40px + env(safe-area-inset-bottom))}@media (min-width:1024px){.nt-scroll{padding:30px 40px 44px}}.nt-doc{max-width:660px}.nt-doc-head{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:14px;color:var(--nt-dim)}.nt-doc-head,.nt-doc-kind{align-items:center;font-size:12px}.nt-doc-kind{display:inline-flex;gap:6px;min-height:26px;padding:0 11px;border-radius:9999px;background:color-mix(in oklab,var(--nt-kind,var(--nt-tint)) 14%,transparent);border:1px solid color-mix(in oklab,var(--nt-kind,var(--nt-tint)) 32%,transparent);font-weight:700;color:var(--nt-kind,var(--nt-tint))}.nt-doc-sep{width:3px;height:3px;border-radius:9999px;background:var(--nt-faint)}.nt-doc-title{font-size:24px;font-weight:800;letter-spacing:-.025em;line-height:1.22;margin:0 0 18px;text-wrap:pretty}@media (min-width:1024px){.nt-doc-title{font-size:29px;margin-bottom:20px}}.nt-prose{font-size:16px;line-height:1.75;color:var(--text);text-wrap:pretty}@media (min-width:1024px){.nt-prose{font-size:16.5px;line-height:1.78}}.nt-prose p{margin:0 0 16px}.nt-prose p:last-child{margin-bottom:0}.nt-prose strong{font-weight:700}.nt-prose ol,.nt-prose ul{margin:0 0 16px;padding-left:22px}.nt-prose li{margin-bottom:9px}.nt-prose li:last-child{margin-bottom:0}.nt-prose h3{font-size:19px;font-weight:700;letter-spacing:-.015em;margin:24px 0 10px}.nt-prose code{font-family:var(--font-mono),ui-monospace,monospace;font-size:.9em;color:var(--nt-procedure)}.nt-prose blockquote{margin:0 0 16px;padding-left:14px;border-left:2px solid color-mix(in srgb,var(--nt-tint) 50%,transparent);color:var(--nt-dim)}.nt-callout{border-radius:16px;border:1px solid var(--nt-line);background:var(--nt-soft);padding:14px 16px;margin-top:22px}.nt-callout--kind{border-color:color-mix(in oklab,var(--nt-kind,var(--nt-tint)) 24%,transparent);background:color-mix(in oklab,var(--nt-kind,var(--nt-tint)) 8%,transparent)}.nt-callout-label{display:flex;align-items:center;gap:6px;font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--nt-faint);margin-bottom:8px}.nt-callout--kind .nt-callout-label{color:var(--nt-kind,var(--nt-tint))}.nt-quote{border-left:2px solid color-mix(in srgb,var(--nt-tint) 55%,transparent);padding-left:13px;font-size:15px;line-height:1.65;font-style:italic;color:var(--nt-dim)}.nt-tags{display:flex;flex-wrap:wrap;gap:7px;margin-top:18px}.nt-tag{display:inline-flex;align-items:center;min-height:26px;padding:0 11px;border-radius:9999px;background:var(--nt-soft-hi);border:1px solid var(--nt-line);font-size:12px;color:var(--nt-dim)}.nt-actions{display:none;align-items:center;gap:9px;flex-wrap:wrap;margin-top:22px;padding-top:20px;border-top:1px solid var(--nt-line)}@media (min-width:1024px){.nt-actions{display:flex}}.nt-btn{display:inline-flex;align-items:center;gap:7px;min-height:44px;padding:0 15px;border-radius:13px;border:1px solid var(--nt-line);background:var(--surface-solid);color:var(--nt-dim);font-family:inherit;font-size:13.5px;font-weight:600;white-space:nowrap;cursor:pointer;transition:background .14s ease,color .14s ease}.nt-btn:hover:not(:disabled){background:var(--nt-soft-hi);color:var(--text)}.nt-btn:disabled{opacity:.5;cursor:not-allowed}.nt-btn--jump{border-color:color-mix(in oklab,var(--nt-jump) 40%,transparent);background:color-mix(in oklab,var(--nt-jump) 14%,transparent);color:var(--nt-jump);font-weight:700}.nt-btn--jump:hover:not(:disabled){background:color-mix(in oklab,var(--nt-jump) 22%,transparent);color:var(--nt-jump)}.nt-btn--ai{border-color:color-mix(in oklab,var(--nt-raw) 34%,transparent);background:color-mix(in oklab,var(--nt-raw) 13%,transparent);color:var(--nt-raw);font-weight:700}.nt-btn--ai:hover:not(:disabled){background:color-mix(in oklab,var(--nt-raw) 20%,transparent);color:var(--nt-raw)}.nt-btn--sm{min-height:44px;padding:0 14px;font-size:13px;border-radius:12px}.nt-error{margin-top:10px;font-size:12px;color:var(--nt-danger)}.nt-thread{margin-top:26px;border-radius:18px;border:1px solid var(--nt-line);background:var(--nt-soft);overflow:hidden}.nt-thread-head{display:flex;align-items:center;gap:8px;width:100%;padding:12px 16px;border:none;border-bottom:1px solid var(--nt-line);background:color-mix(in oklab,var(--nt-raw) 6%,transparent);color:var(--text);font-family:inherit;font-size:13px;font-weight:700;cursor:pointer;text-align:left}.nt-thread-body{padding:14px 16px;display:flex;flex-direction:column;gap:12px}.nt-bubble{max-width:88%;padding:11px 13px;font-size:14px;line-height:1.6;border:1px solid var(--nt-line)}.nt-bubble--you{align-self:flex-end;border-radius:14px 14px 4px 14px;background:var(--nt-soft-hi);color:var(--text)}.nt-bubble--ai{align-self:flex-start;border-radius:14px 14px 14px 4px;border-color:color-mix(in oklab,var(--nt-raw) 22%,transparent);background:color-mix(in oklab,var(--nt-raw) 8%,transparent);color:var(--text)}.nt-bubble--pending{opacity:.7}.nt-bubble-who{gap:5px;font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--nt-raw);margin-bottom:6px}.nt-bubble-who,.nt-composer{display:flex;align-items:center}.nt-composer{gap:9px;margin-top:2px}.nt-composer input{flex:1;min-width:0;height:44px;padding:0 13px;border-radius:13px;border:1px solid var(--nt-line);background:var(--surface-solid);color:var(--text);font-family:inherit;font-size:13.5px;outline:none}.nt-composer input::-moz-placeholder{color:var(--nt-dim)}.nt-composer input::placeholder{color:var(--nt-dim)}.nt-composer input:focus{border-color:color-mix(in srgb,var(--nt-tint) 45%,transparent)}.nt-send{flex-shrink:0;display:flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:13px;border:none;background:linear-gradient(135deg,var(--nt-tint),var(--note-accent-end));color:var(--ink-bright);cursor:pointer}.nt-send:disabled{opacity:.5;cursor:not-allowed}.nt-toc{display:flex;flex-direction:column;gap:2px;margin-bottom:18px}.nt-toc-item{display:flex;align-items:center;gap:9px;min-height:44px;padding:5px 9px;border-radius:10px;border:1px solid transparent;background:transparent;color:var(--nt-dim);font-family:inherit;font-size:13px;cursor:pointer;text-align:left}.nt-toc-item:hover{background:var(--nt-soft-hi);color:var(--text)}.nt-toc-item[aria-current=true]{border-color:color-mix(in srgb,var(--nt-tint) 28%,transparent);background:color-mix(in srgb,var(--nt-tint) 13%,transparent);color:var(--text);font-weight:700}.nt-toc-num{flex-shrink:0;font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;color:var(--nt-dim)}.nt-toc-item>span:last-child{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-notice{border-radius:14px;border:1px solid color-mix(in oklab,var(--warn) 32%,transparent);background:color-mix(in oklab,var(--warn) 10%,transparent);padding:12px 13px;font-size:12px;line-height:1.55;color:var(--text)}.nt-notice-title{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:700;color:var(--warn);margin-bottom:5px}.nt-cite{display:flex;flex-wrap:wrap;gap:7px;margin:0 0 24px}.nt-cite button{display:inline-flex;align-items:center;gap:5px;max-width:260px;min-height:44px;padding:0 14px;border-radius:9999px;border:1px solid var(--nt-line);background:var(--surface-solid);color:var(--nt-dim);font-family:inherit;font-size:12px;cursor:pointer;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-cite button:hover{border-color:color-mix(in srgb,var(--nt-tint) 40%,transparent);color:var(--text)}.nt-doc-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;font-size:12.5px;color:var(--nt-dim);margin-bottom:24px}.nt-lede{margin:0 0 26px;padding-left:16px;border-left:2px solid color-mix(in srgb,var(--nt-tint) 50%,transparent)}.nt-section{scroll-margin-top:20px}.nt-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;height:100%;padding:40px 24px;text-align:center}.nt-empty--start{align-items:flex-start;justify-content:flex-start;padding:24px 8px 40px;text-align:left}.nt-empty-icon{display:flex;align-items:center;justify-content:center;width:52px;height:52px;border-radius:17px;background:color-mix(in srgb,var(--nt-tint) 14%,transparent);border:1px solid color-mix(in srgb,var(--nt-tint) 28%,transparent);color:var(--nt-tint);margin-bottom:8px}.nt-empty-title{font-size:17px;font-weight:700}.nt-empty-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.nt-empty-body{max-width:46ch;font-size:14px;line-height:1.6;color:var(--nt-dim);text-wrap:pretty}.nt-skeleton{border-radius:9999px;background:var(--nt-soft-hi);animation:nt-pulse 1.5s ease-in-out infinite}.nt-modal-scrim{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:16px;background:var(--modal-backdrop);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px)}.nt-modal{width:100%;max-width:560px;max-height:88vh;overflow-y:auto;border-radius:22px;border:1px solid var(--nt-line);background:var(--surface-solid);box-shadow:0 24px 60px color-mix(in srgb,var(--popover-shadow-ink) 35%,transparent);padding:22px;display:flex;flex-direction:column;gap:14px}.nt-modal h2{margin:0;font-size:18px;font-weight:800;letter-spacing:-.02em}.nt-field{width:100%;padding:11px 13px;border-radius:12px;border:1px solid var(--nt-line);background:var(--nt-soft);color:var(--text);font-family:inherit;font-size:14px;outline:none;resize:vertical}.nt-field:focus{border-color:color-mix(in srgb,var(--nt-tint) 45%,transparent)}.nt-field::-moz-placeholder{color:var(--nt-dim)}.nt-field::placeholder{color:var(--nt-dim)}.nt-modal-foot{display:flex;justify-content:flex-end;gap:9px}@media (max-width:1023.98px){.nt-list{border-right:none}.nt-lib[data-pane=library] .nt-reader,.nt-lib[data-pane=reader] .nt-list{display:none}}.nt-sheet-scrim{position:fixed;inset:0;z-index:90;display:flex;align-items:flex-end;background:var(--modal-backdrop);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}.nt-sheet{width:100%;max-height:78vh;display:flex;flex-direction:column;border-radius:24px 24px 0 0;border:1px solid var(--nt-line);border-bottom:none;background:var(--surface-solid);color:var(--text);padding:8px 10px calc(16px + env(safe-area-inset-bottom));animation:nt-sheet-up .22s cubic-bezier(.22,1,.36,1)}@keyframes nt-sheet-up{0%{transform:translateY(16px);opacity:0}to{transform:none;opacity:1}}.nt-sheet-grip{flex-shrink:0;width:40px;height:4px;border-radius:9999px;background:var(--nt-soft-hi);margin:6px auto 10px}.nt-sheet-scroll{flex:1;min-height:0;overflow-y:auto}@media (max-width:1023.98px){body:has(.nt-lib) [data-sonner-toaster][data-y-position=bottom]{bottom:calc(132px + env(safe-area-inset-bottom))}}body:has(.nt-lib) [data-sonner-toast] [data-button]{height:auto;min-height:44px;padding:0 14px;font-size:13px}.nt-dock{flex-shrink:0;display:flex;align-items:center;gap:9px;padding:10px 14px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--nt-line);background:var(--nt-panel);backdrop-filter:blur(20px) saturate(140%);-webkit-backdrop-filter:blur(20px) saturate(140%)}.nt-dock .nt-btn:first-child{flex:1;justify-content:center}@media (min-width:1024px){.nt-dock{display:none}}.nt-print-frame>tfoot,.nt-print-frame>thead,.nt-print-watermark{display:none}.nt-print-frame,.nt-print-frame>tbody,.nt-print-frame>tbody>tr,.nt-print-frame>tbody>tr>td{display:block}.nt-print-frame>tbody>tr>td{padding:0}@media print{body :not(.nt-printing):not(.nt-printing *):not(:has(.nt-printing)){display:none!important}body :has(.nt-printing),body:has(.nt-printing),html:has(.nt-printing){display:block!important;position:static!important;height:auto!important;min-height:0!important;max-height:none!important;overflow:visible!important;padding:0!important;margin:0!important;transform:none!important}body :has(.nt-printing),body:has(.nt-printing),html:has(.nt-printing){background:var(--print-paper)!important}body :has(.nt-printing):after,body :has(.nt-printing):before{display:none!important}.nt-printing{position:static!important;display:block!important;max-width:none!important;overflow:visible!important;padding:0!important;color:var(--print-ink)!important;background:var(--print-paper)!important}.nt-printing.nt-doc *{color:var(--print-ink)!important;background:transparent!important}.nt-printing.nt-doc .nt-callout{border:1px solid var(--print-rule-strong)!important}.nt-printing :is(header,nav){display:block!important}.nt-printing .nt-cite,.nt-printing .nt-no-print{display:none!important}.nt-printing .nt-print-watermark{display:grid!important;position:fixed;inset:0;z-index:1;grid-template-columns:repeat(2,1fr);grid-template-rows:repeat(4,1fr);place-items:center;opacity:.07;pointer-events:none}.nt-printing .nt-print-watermark img{width:150pt;height:auto;transform:rotate(-30deg)}.nt-printing{page:notes}.nt-printing .nt-print-frame{display:table!important;width:100%;border-collapse:collapse}.nt-printing .nt-print-frame>thead{display:table-header-group!important}.nt-printing .nt-print-frame>tbody{display:table-row-group!important}.nt-printing .nt-print-frame>tfoot{display:table-footer-group!important}.nt-printing .nt-print-frame>*>tr{display:table-row!important}.nt-printing .nt-print-frame>*>tr>td{display:table-cell!important;padding:0}.nt-printing .nt-print-foot,.nt-printing .nt-print-head{display:flex!important;align-items:center;justify-content:space-between;gap:16pt;font-size:8.5pt;letter-spacing:.01em;color:var(--print-muted)}.nt-printing .nt-print-head{padding-bottom:6pt;margin-bottom:16pt;border-bottom:.75pt solid var(--print-rule-strong)}.nt-printing .nt-print-head>span{text-align:right}.nt-printing .nt-print-head>img{flex:0 0 auto;height:13pt;width:auto}.nt-printing .nt-print-foot{padding-top:6pt;margin-top:16pt;border-top:.75pt solid var(--print-rule-strong)}}@page notes{margin:14mm 14mm 16mm;@bottom-center{content:counter(page) " / " counter(pages);font-size:8pt}}.nt-phone-only{display:inline-flex}.nt-desk-only{display:none}@media (min-width:1024px){.nt-phone-only{display:none}.nt-desk-only{display:inline-flex}}.nt-phone-only.w-full{display:flex}@media (min-width:1024px){.nt-phone-only.w-full{display:none}}.nt-lib,.nt-rv-reader{--nt-rv-mark:color-mix(in srgb,var(--warn) 26%,transparent);--nt-rv-mark-hi:color-mix(in srgb,var(--warn) 42%,transparent);--nt-rv-caution:var(--bad);--nt-rv-scale:1;--nt-rv-meta:color-mix(in srgb,var(--nt-dim) 70%,var(--text))}.nt-tabs button{min-height:40px;font-size:13px}@media (max-width:1023.98px){.nt-tabs button{min-height:44px;font-size:14px}}.nt-rv-rail-body{flex:1;min-height:0;display:flex;flex-direction:column}.nt-rv-switcher{position:relative;flex-shrink:0;padding:0 12px 12px}.nt-rv-chapters{flex:1;min-height:0;overflow-y:auto;padding:0 8px 14px}.nt-rv-chapter-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}.nt-rv-chapter{min-height:44px}.nt-rv-chapter .nt-nav-label{white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;line-height:1.3}.nt-rv-chapter--page{min-height:52px;padding:8px 10px}.nt-rv-chapter--page .nt-nav-label{font-size:14px;-webkit-line-clamp:3}.nt-rv-chapter-text{flex:1;min-width:0;display:flex;flex-direction:column;gap:1px}.nt-rv-chapter-text .nt-nav-label{flex:none}.nt-rv-chapter-meta{font-size:12px;line-height:1.3;color:var(--nt-rv-meta)}.nt-rv-chapter--soon .nt-nav-label{color:var(--nt-rv-meta);font-weight:500}.nt-rv-chapter--soon .nt-rv-chapter-meta{font-style:italic}.nt-rv-chapters .nt-nav-badge,.nt-rv-topics .nt-nav-badge{min-width:26px;width:auto;height:26px;padding:0 5px;font-size:12px;color:var(--nt-rv-meta)}.nt-rv-switcher .nt-subject-count{font-size:12px;color:var(--nt-rv-meta)}.nt-rv-lock{flex-shrink:0;display:flex;color:var(--nt-dim)}.nt-rv-quiet{padding:4px 8px;font-size:12.5px;color:var(--nt-dim)}.nt-rv-phone{flex:1;min-height:0;display:flex;flex-direction:column}@media (min-width:1024px){.nt-rv-phone{display:none}}.nt-rv-phone-head{flex-shrink:0;padding:13px 14px 12px}.nt-rv-phone-scroll{flex:1;min-height:0;overflow-y:auto;padding-bottom:calc(24px + env(safe-area-inset-bottom))}.nt-rv-phone-scroll .nt-rv-switcher{padding:0 14px 10px}.nt-rv-phone-scroll .nt-rv-chapters{overflow:visible;padding:0 10px 14px}.nt-rv-chapters .nt-eyebrow,.nt-rv-reader .nt-eyebrow,.nt-rv-reader-desk .nt-eyebrow{font-size:12px;color:var(--nt-dim)}.nt-rv-bar{position:relative;z-index:2}.nt-rv-bar-title{font-size:14px;font-weight:700;line-height:1.3;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-rv-docseg{width:auto;flex-shrink:0}.nt-rv-docseg button{flex:0 0 auto;min-width:84px;min-height:34px;padding:0 12px;white-space:nowrap}.nt-rv-docseg button:not([aria-pressed=true]){color:var(--nt-rv-meta)}.nt-rv-outline{position:absolute;z-index:30;right:0;top:calc(100% + 6px);width:300px;max-height:min(420px,60vh);overflow-y:auto;padding:5px;border-radius:14px;border:1px solid var(--nt-line);background:var(--surface-solid);box-shadow:var(--shadow-2);display:flex;flex-direction:column;gap:2px}.nt-rv-outline .nt-subject-option{min-height:40px;align-items:baseline;padding:9px 10px}.nt-rv-outline .nt-subject-option>span:last-child{white-space:normal;flex:1;min-width:0}.nt-rv-outline .nt-subject-option>span:first-child,.nt-rv-outline-num{flex:0 0 auto;font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;color:var(--nt-dim)}.nt-rv-scroll{position:relative}@media (min-width:1024px){.nt-rv-scroll{padding:34px 48px 64px}}.nt-rv-doc{max-width:66ch;font-size:16px;line-height:1.7;color:var(--text);text-wrap:pretty}@media (min-width:1024px){.nt-rv-doc{font-size:16.5px}}.nt-rv-doc p{margin:0}.nt-rv-title{margin-bottom:26px}.nt-rv-title .nt-eyebrow{font-size:12px;margin-bottom:8px;color:var(--nt-dim)}.nt-rv-title-name{margin:0;font-family:var(--font-headline),system-ui,sans-serif;font-size:1.6em;font-weight:800;letter-spacing:-.025em;line-height:1.2;text-wrap:balance}.nt-rv-map{margin:0 0 34px;padding:16px 18px;border-radius:16px;border:1px solid var(--nt-line);background:var(--nt-soft)}.nt-rv-map-label{margin:0 0 10px;font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--nt-dim)}.nt-rv-map ol{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}.nt-rv-map-topic{display:inline-flex;align-items:baseline;gap:8px;min-height:44px;padding:2px 0;border:none;background:none;color:var(--text);font-family:inherit;font-size:.95em;font-weight:700;text-align:left;cursor:pointer;text-decoration:underline;text-decoration-color:color-mix(in srgb,var(--nt-tint) 35%,transparent);text-underline-offset:4px}.nt-rv-map-topic:hover{text-decoration-color:var(--nt-tint)}.nt-rv-map-num,.nt-rv-topic-num{font-family:var(--font-mono),ui-monospace,monospace;font-size:max(12px,.72em);font-weight:600;color:var(--nt-dim);flex:0 0 auto;white-space:nowrap}.nt-rv-ideas{list-style:none;margin:2px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:2px 0;font-size:.86em;color:var(--nt-dim)}.nt-rv-ideas li:not(:last-child):after{content:"·";margin:0 8px;color:var(--nt-faint)}.nt-rv-fgroup,.nt-rv-topic{scroll-margin-top:16px}.nt-rv-topic+.nt-rv-topic{margin-top:44px;padding-top:30px;border-top:1px solid var(--nt-line)}.nt-rv-fgroup h2,.nt-rv-topic h2{display:flex;align-items:baseline;gap:10px;margin:0 0 18px;font-family:var(--font-headline),system-ui,sans-serif;font-size:1.22em;font-weight:800;letter-spacing:-.015em;line-height:1.3}.nt-rv-block+.nt-rv-block{margin-top:24px}.nt-rv-block-label{display:flex;align-items:center;gap:6px;margin:0 0 10px;font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--nt-dim)}.nt-rv-terms{margin:0;display:flex;flex-direction:column;gap:10px}.nt-rv-term dt{display:inline;font-weight:700}.nt-rv-term dt:after{content:" — ";font-weight:400;color:var(--nt-faint)}.nt-rv-term dd{display:inline;margin:0}.nt-rv-points{list-style:none;counter-reset:nt-rv-point;margin:0;padding:0;display:flex;flex-direction:column;gap:9px}.nt-rv-points li{counter-increment:nt-rv-point;position:relative;padding-left:2.1em}.nt-rv-points li:before{content:counter(nt-rv-point);position:absolute;left:0;top:.12em;min-width:1.5em;font-family:var(--font-mono),ui-monospace,monospace;font-size:max(12px,.78em);font-weight:600;color:var(--nt-tint)}.nt-rv-laws{display:flex;flex-direction:column;gap:14px}.nt-rv-law{padding-left:14px;border-left:2px solid color-mix(in srgb,var(--nt-tint) 45%,transparent)}.nt-rv-doc .nt-rv-law-name{font-weight:700;margin-bottom:2px}.nt-rv-eqs{display:flex;flex-direction:column;gap:10px}.nt-rv-eq-label{font-size:.86em;color:var(--nt-dim)}.nt-rv-math--display{max-width:100%;overflow-x:auto;overflow-y:hidden}.nt-rv-math--display .katex-display{margin:.35em 0;text-align:left;overflow:visible}.nt-rv-math--display .katex-display>.katex{text-align:left}.nt-rv-doc .katex{white-space:normal}.nt-rv-doc .katex.nt-rv-math-wide{display:block;max-width:100%;overflow-x:auto;overflow-y:hidden;white-space:nowrap;padding:2px 0}.nt-rv-math-scroll{scrollbar-width:thin;scrollbar-color:var(--nt-faint) transparent}.nt-rv-math-scroll:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}.nt-rv-math-scroll[data-more-end]{-webkit-mask-image:linear-gradient(to right,var(--text) calc(100% - 32px),transparent);mask-image:linear-gradient(to right,var(--text) calc(100% - 32px),transparent)}.nt-rv-math-scroll[data-more-start]{-webkit-mask-image:linear-gradient(to right,transparent,var(--text) 32px);mask-image:linear-gradient(to right,transparent,var(--text) 32px)}.nt-rv-math-scroll[data-more-start][data-more-end]{-webkit-mask-image:linear-gradient(to right,transparent,var(--text) 32px,var(--text) calc(100% - 32px),transparent);mask-image:linear-gradient(to right,transparent,var(--text) 32px,var(--text) calc(100% - 32px),transparent)}.nt-rv-diagrams{display:flex;flex-direction:column;gap:14px}.nt-rv-diagram{display:flex;gap:12px;align-items:flex-start}.nt-rv-draw{flex-shrink:0;margin-top:.2em;padding:1px 8px;border-radius:9999px;border:1px solid var(--nt-line);font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--nt-dim)}.nt-rv-diagram-name{font-weight:700}.nt-rv-labels{list-style:none;margin:6px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:6px}.nt-rv-labels li{padding:1px 9px;border-radius:9999px;background:var(--nt-soft-hi);font-size:.82em}.nt-rv-doc .nt-rv-tip{margin-top:6px;font-size:.9em;color:var(--nt-dim);font-style:italic}.nt-rv-fig{margin:0}.nt-rv-fig-frame{display:flex;justify-content:center;padding:14px;border:1px solid var(--nt-line);border-radius:14px;background:var(--manim-canvas)}.nt-rv-fig-open{position:relative;width:100%;color:var(--text);font:inherit;cursor:zoom-in}.nt-rv-fig-open:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.nt-rv-fig-zoom{position:absolute;top:8px;right:8px;display:grid;place-items:center;width:32px;height:32px;border-radius:9999px;border:1px solid var(--border);background:var(--surface-solid);color:var(--text);box-shadow:var(--shadow-1)}.nt-rv-fig-img{width:auto;max-width:100%;height:auto;max-height:min(340px,55vh);-o-object-fit:contain;object-fit:contain}.nt-rv-fig-caption{display:flex;gap:12px;align-items:flex-start;margin-top:10px}.nt-rv-fig-labels{list-style:none;margin:3px 0 0;padding:0;display:flex;flex-wrap:wrap;-moz-column-gap:.45em;column-gap:.45em;font-size:.86em;color:var(--nt-dim)}.nt-rv-fig-labels:before{content:attr(data-caption) ":";margin-right:.15em;color:var(--nt-faint)}.nt-rv-fig-labels li+li:before{content:"·";margin-right:.45em;color:var(--nt-faint)}.nt-rv-diff{border:1px solid var(--nt-line);border-radius:14px;overflow:hidden;font-size:.92em}.nt-rv-diff-row{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1fr) minmax(0,1fr);gap:0 14px;padding:10px 14px}.nt-rv-diff-row+.nt-rv-diff-row{border-top:1px solid var(--nt-line)}.nt-rv-diff-row--head{background:var(--nt-soft-hi);font-weight:700}.nt-rv-diff-feature{font-weight:700;color:var(--nt-dim)}.nt-rv-diff-row--head .nt-rv-diff-feature{color:var(--nt-dim);font-weight:600}@media (max-width:559.98px){.nt-rv-diff-row{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:4px 12px}.nt-rv-diff-feature{grid-column:1/-1;font-size:.86em}.nt-rv-diff-row--head .nt-rv-diff-feature{display:none}}.nt-rv-frames{display:flex;flex-direction:column;gap:14px}.nt-rv-frame{position:relative;padding:14px 16px;border-radius:14px;border:1px solid var(--nt-line);background:var(--nt-soft)}.nt-rv-marks{float:right;margin:0 0 6px 12px;padding:1px 9px;border-radius:9999px;background:color-mix(in srgb,var(--nt-tint) 14%,transparent);color:var(--text);font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;font-weight:700;white-space:nowrap}.nt-rv-doc .nt-rv-frame-q{font-weight:700;margin-bottom:10px}.nt-rv-steps{list-style:none;counter-reset:nt-rv-step;margin:0;padding:0;display:flex;flex-direction:column;gap:7px}.nt-rv-steps li{counter-increment:nt-rv-step;display:grid;grid-template-columns:1.6em minmax(0,1fr) auto;gap:0 8px;align-items:baseline}.nt-rv-steps li:before{content:counter(nt-rv-step) ".";font-size:max(12px,.8em)}.nt-rv-steps li:after,.nt-rv-steps li:before{font-family:var(--font-mono),ui-monospace,monospace;color:var(--nt-dim)}.nt-rv-steps li:after{content:attr(data-marks);font-size:12px;white-space:nowrap}.nt-rv-steps[hidden]{display:none}.nt-rv-reveal{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:0 14px;border:1px solid color-mix(in srgb,var(--nt-tint) 35%,transparent);border-radius:9999px;background:color-mix(in srgb,var(--nt-tint) 8%,transparent);color:var(--text);font-family:inherit;font-size:13px;font-weight:600;cursor:pointer;transition:background .14s ease,border-color .14s ease}.nt-rv-reveal .material-symbols-outlined{color:var(--nt-tint)}.nt-rv-reveal:hover{background:color-mix(in srgb,var(--nt-tint) 14%,transparent)}.nt-rv-reveal:focus-visible{outline:2px solid var(--nt-tint);outline-offset:2px}.nt-rv-reveal[aria-expanded=true]{margin-top:12px;border-color:var(--nt-line);background:transparent;color:var(--nt-dim)}.nt-rv-reveal[aria-expanded=true] .material-symbols-outlined{color:var(--nt-dim)}@media (pointer:coarse){.nt-rv-reveal{min-height:44px}}.nt-rv-block--mark_losers .nt-rv-block-label{color:var(--nt-rv-caution)}.nt-rv-losers{list-style:none;margin:0;padding:12px 16px;border-radius:14px;border:1px solid color-mix(in srgb,var(--nt-rv-caution) 22%,transparent);background:color-mix(in srgb,var(--nt-rv-caution) 5%,transparent);display:flex;flex-direction:column;gap:8px}.nt-rv-losers li{position:relative;padding-left:16px}.nt-rv-losers li:before{content:"";position:absolute;left:0;top:.7em;width:6px;height:6px;border-radius:9999px;background:color-mix(in srgb,var(--nt-rv-caution) 70%,transparent)}.nt-rv-fgroup+.nt-rv-fgroup{margin-top:30px}.nt-rv-fgroup h2{font-size:1.05em;margin-bottom:8px}.nt-rv-formulas{margin:0;border-top:1px solid var(--nt-line)}.nt-rv-formula{display:grid;grid-template-columns:minmax(0,.42fr) minmax(0,1fr);gap:4px 18px;align-items:center;padding:8px 2px;border-bottom:1px solid var(--nt-line)}.nt-rv-formula dt{font-weight:600;font-size:.92em;color:var(--nt-dim)}.nt-rv-formula dd{margin:0;min-width:0}.nt-rv-formula .katex-display{margin:0}.nt-rv-condition{display:block;font-size:.82em;color:var(--nt-dim)}@media (max-width:559.98px){.nt-rv-formula{grid-template-columns:minmax(0,1fr)}}.nt-rv-mark{background:var(--nt-rv-mark);color:inherit;border-radius:3px;padding:0 1px;cursor:pointer;box-decoration-break:clone;-webkit-box-decoration-break:clone;transition:background .16s ease}.nt-rv-mark:focus-visible,.nt-rv-mark:hover{background:var(--nt-rv-mark-hi);outline:none}.nt-rv-mark[data-block]{display:block}@keyframes nt-rv-flash{0%,60%{background:color-mix(in srgb,var(--nt-tint) 16%,transparent)}to{background:transparent}}.nt-rv-flash{border-radius:8px;animation:nt-rv-flash 1.8s ease-out}.nt-rv-selbar{position:fixed;z-index:96;transform:translateX(-50%);display:flex;align-items:center;gap:2px;padding:4px;border-radius:9999px;border:1px solid var(--border);background:var(--surface-solid);color:var(--text);box-shadow:var(--shadow-2);animation:nt-rise .16s cubic-bezier(.22,1,.36,1)}.nt-rv-selbar--dock{left:50%;bottom:calc(14px + env(safe-area-inset-bottom));max-width:calc(100vw - 24px)}.nt-rv-selbtn{display:inline-flex;align-items:center;gap:6px;min-height:44px;padding:0 14px;border:none;border-radius:9999px;background:transparent;color:var(--text);font-family:inherit;font-size:13.5px;font-weight:600;white-space:nowrap;cursor:pointer}.nt-rv-selbtn:hover:not(:disabled){background:var(--nt-soft-hi,color-mix(in srgb,var(--text) 9%,transparent))}.nt-rv-selbtn:disabled{opacity:.6;cursor:default}.nt-rv-selbtn:focus-visible{outline:2px solid var(--brand);outline-offset:2px}.nt-rv-selbtn--icon{width:44px;padding:0;justify-content:center;color:var(--text-muted)}.nt-rv-selsep{width:1px;height:22px;background:var(--border);flex-shrink:0}.nt-rv-reader{position:fixed;inset:0;z-index:95;display:flex;flex-direction:column;background:var(--background);color:var(--text);animation:nt-rv-fade .2s ease-out}@keyframes nt-rv-fade{0%{opacity:0}to{opacity:1}}.nt-rv-reader :focus-visible{outline:2px solid var(--brand);outline-offset:2px}.nt-rv-reader-bottom,.nt-rv-reader-top{flex-shrink:0;display:flex;align-items:center;gap:6px;border-radius:0}.nt-rv-reader-top{position:relative;padding:calc(6px + env(safe-area-inset-top)) 8px 6px max(8px,env(safe-area-inset-left));border-bottom:1px solid var(--border)}.nt-rv-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--nt-tint);transform-origin:left center;transform:scaleX(var(--nt-rv-progress,0));pointer-events:none}.nt-rv-reader-bottom{padding:6px max(10px,env(safe-area-inset-right)) calc(6px + env(safe-area-inset-bottom)) max(10px,env(safe-area-inset-left));border-top:1px solid var(--border)}.nt-rv-reader-heading{flex:1;min-width:0}.nt-rv-reader-title{margin:0;font-size:15px;font-weight:700;line-height:1.25;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-rv-icon-btn{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border:none;border-radius:9999px;background:transparent;color:var(--text);cursor:pointer}.nt-rv-icon-btn:disabled{opacity:.35;cursor:default}.nt-rv-icon-btn:active:not(:disabled){background:color-mix(in srgb,var(--text) 9%,transparent)}.nt-rv-reader-bottom .nt-rv-docseg{flex:1;min-width:0}.nt-rv-reader-bottom .nt-rv-docseg button{flex:1 1 0%;min-width:0;min-height:44px;padding:0 6px;font-size:13.5px}.nt-rv-size{display:flex}.nt-rv-topics-scrim{z-index:97}.nt-rv-topics-head{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;gap:8px;padding:0 0 6px 8px}.nt-rv-topics-title{margin:0;font-size:16px;font-weight:700;line-height:1.3}.nt-rv-pages{flex:1;min-height:0;overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;padding:12px 6px 32px}@media (min-width:480px){.nt-rv-pages{padding:14px 10px 32px}}.nt-rv-pages>.nt-rv-loading,.nt-rv-pages>.nt-rv-state{margin:0 auto}.nt-rv-doc--pages{max-width:66ch;margin:0 auto;display:flex;flex-direction:column;gap:14px;font-size:calc(17px * var(--nt-rv-scale));line-height:1.65}.nt-rv-sheet{padding:18px 12px 14px;border-radius:12px;border:1px solid var(--border);background:var(--surface-solid);box-shadow:var(--shadow-1)}@media (min-width:480px){.nt-rv-sheet{padding:26px 30px 18px}}.nt-rv-runhead{display:flex;justify-content:space-between;gap:12px;margin-bottom:18px;padding-bottom:8px;border-bottom:1px solid var(--nt-line,var(--border));font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;color:var(--text-muted)}.nt-rv-runhead span:first-child{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.nt-rv-doc .nt-rv-folio{margin:22px 0 0;text-align:center;font-family:var(--font-mono),ui-monospace,monospace;font-size:12px;color:var(--text-muted)}.nt-rv-doc--pages .nt-rv-topic+.nt-rv-topic{margin-top:0;padding-top:0;border-top:none}.nt-rv-doc--pages .nt-rv-title-name{font-size:1.45em}.nt-rv-doc--pages .nt-rv-fig-frame{margin-inline:-6px;width:calc(100% + 12px);padding:6px}.nt-rv-doc--pages .nt-rv-fig-img{width:100%;max-height:min(460px,62vh)}.nt-rv-viewer{position:fixed;inset:0;z-index:98;display:flex;flex-direction:column;background:var(--background);color:var(--text);animation:nt-rv-fade .16s ease-out}.nt-rv-viewer :focus-visible{outline:2px solid var(--brand);outline-offset:2px}.nt-rv-viewer-bottom,.nt-rv-viewer-top{flex-shrink:0;display:flex;align-items:center;gap:8px;background:var(--surface-solid)}.nt-rv-viewer-top{padding:calc(6px + env(safe-area-inset-top)) 8px 6px max(14px,env(safe-area-inset-left));border-bottom:1px solid var(--border)}.nt-rv-viewer-bottom{justify-content:center;padding:6px 10px calc(6px + env(safe-area-inset-bottom));border-top:1px solid var(--border)}.nt-rv-viewer-title{flex:1;min-width:0;margin:0;font-size:15px;font-weight:700;line-height:1.3}.nt-rv-viewer-zoom{min-width:56px;text-align:center;font-size:13px;font-variant-numeric:tabular-nums;color:var(--text-muted)}.nt-rv-viewer-stage{flex:1;min-height:0;display:flex;overflow:auto;overscroll-behavior:contain;touch-action:pan-x pan-y;background:var(--manim-canvas);cursor:zoom-in}.nt-rv-viewer-stage[data-zoomed]{cursor:zoom-out}.nt-rv-viewer-canvas{flex-shrink:0;margin:auto}.nt-rv-viewer-img{width:100%;height:auto;vertical-align:top}.nt-rv-state-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-top:16px}.nt-rv-state-actions .nt-btn{min-height:44px}.nt-rv-loading{display:flex;flex-direction:column;gap:14px;padding-top:8px}.nt-rv-state{min-height:50vh}@media (prefers-reduced-motion:reduce){.nt-rv-flash,.nt-rv-reader,.nt-rv-selbar,.nt-rv-viewer{animation:none}.nt-rv-flash{outline:2px solid color-mix(in srgb,var(--nt-tint) 45%,transparent);outline-offset:4px}}@media print{.nt-printing:has(.nt-rv-doc){-webkit-print-color-adjust:exact;print-color-adjust:exact;--text:var(--print-text);--text-muted:var(--print-muted);--nt-tint:var(--print-brand);--nt-dim:var(--print-muted);--nt-faint:var(--print-rule-strong);--nt-line:var(--print-rule);--nt-soft:transparent;--nt-soft-hi:transparent;--nt-rv-caution:var(--print-rose);--nt-rv-mark:var(--print-highlight);--nt-rv-mark-hi:var(--print-highlight);--rv-ink:var(--print-brand);--rv-tint:color-mix(in srgb,var(--rv-ink) 7%,var(--print-paper));--rv-edge:color-mix(in srgb,var(--rv-ink) 30%,var(--print-paper));color:var(--print-text)}.nt-printing .nt-rv-doc{max-width:none;font-size:10pt;line-height:1.5}.nt-printing .nt-rv-block{--rv-tint:color-mix(in srgb,var(--rv-ink) 7%,var(--print-paper));--rv-edge:color-mix(in srgb,var(--rv-ink) 30%,var(--print-paper))}.nt-printing .nt-rv-block--key_terms{--rv-ink:var(--print-brand)}.nt-printing .nt-rv-block--key_points{--rv-ink:var(--print-blue)}.nt-printing .nt-rv-block--laws{--rv-ink:var(--print-teal)}.nt-printing .nt-rv-block--equations{--rv-ink:var(--print-plum)}.nt-printing .nt-rv-block--diagrams{--rv-ink:var(--print-green)}.nt-printing .nt-rv-block--differences{--rv-ink:var(--print-cyan)}.nt-printing .nt-rv-block--answer_frames{--rv-ink:var(--print-orange)}.nt-printing .nt-rv-block--mark_losers{--rv-ink:var(--print-rose)}.nt-printing .nt-rv-title{margin-bottom:12pt;padding-bottom:8pt;border-bottom:2pt solid var(--print-brand)}.nt-printing .nt-rv-title .nt-eyebrow{color:var(--print-brand);font-size:8pt;margin-bottom:3pt}.nt-printing .nt-rv-title-name{color:var(--print-brand-deep);font-size:20pt}.nt-printing .nt-rv-map{margin:0 0 14pt;padding:9pt 12pt 10pt;border-radius:8pt;border:.75pt solid var(--rv-edge);background:var(--rv-tint)}.nt-printing .nt-rv-map-label{margin-bottom:6pt;font-size:7.5pt;color:var(--print-brand)}.nt-printing .nt-rv-map ol{display:block;-moz-columns:2;column-count:2;-moz-column-gap:18pt;column-gap:18pt}.nt-printing .nt-rv-map li{-moz-column-break-inside:avoid;break-inside:avoid;padding-bottom:6pt}.nt-printing .nt-rv-map-topic{align-items:flex-start;min-height:0;padding:0;gap:5pt;font-size:9.5pt;color:var(--print-brand-deep);text-decoration:none}.nt-printing .nt-rv-map-topic .nt-rv-map-num{align-self:flex-start;margin-top:1.5pt}.nt-printing .nt-rv-ideas{margin-top:1pt;font-size:8pt;line-height:1.4;color:var(--print-muted)}.nt-printing .nt-rv-ideas li{padding-bottom:0}.nt-printing .nt-rv-ideas li:not(:last-child):after{margin:0 4pt;color:var(--print-brand)}.nt-printing :is(.nt-rv-map-num,.nt-rv-topic-num){align-self:center;flex:0 0 auto;padding:.5pt 4.5pt;border-radius:4pt;background:var(--print-brand);color:var(--print-paper);font-size:7.5pt;line-height:1.5}.nt-printing .nt-rv-topic+.nt-rv-topic{margin-top:16pt;padding-top:0;border-top:none}.nt-printing .nt-rv-fgroup h2,.nt-printing .nt-rv-topic h2{align-items:center;gap:7pt;margin:0 0 9pt;padding:5pt 9pt;border-left:3pt solid var(--print-brand);border-radius:0 6pt 6pt 0;background:color-mix(in srgb,var(--print-brand) 9%,var(--print-paper));color:var(--print-brand-deep);font-size:12.5pt;-moz-column-break-inside:avoid;break-inside:avoid}.nt-printing .nt-rv-block+.nt-rv-block{margin-top:10pt}.nt-printing .nt-rv-block-label{gap:5pt;margin:0 0 5pt;font-size:7.5pt;letter-spacing:.1em;color:var(--rv-ink)}.nt-printing .nt-rv-block-label .material-symbols-outlined{display:inline-grid;place-items:center;width:14pt;height:14pt;border-radius:4pt;background:color-mix(in srgb,var(--rv-ink) 13%,var(--print-paper));font-size:10pt!important}.nt-printing .nt-rv-block-label:after{content:"";flex:1;height:.75pt;background:var(--rv-edge)}.nt-printing .nt-rv-terms{gap:4pt}.nt-printing .nt-rv-term{-moz-column-break-inside:avoid;break-inside:avoid}.nt-printing .nt-rv-term dt{color:var(--print-brand-deep)}.nt-printing .nt-rv-term dt:after{color:var(--print-brand)}.nt-printing .nt-rv-points{gap:4pt}.nt-printing .nt-rv-points li{-moz-column-break-inside:avoid;break-inside:avoid;padding-left:19pt}.nt-printing .nt-rv-points li:before{top:.15em;width:12pt;min-width:0;height:12pt;border-radius:9999px;background:color-mix(in srgb,var(--rv-ink) 13%,var(--print-paper));color:var(--rv-ink);font-size:7pt;line-height:12pt;text-align:center}.nt-printing .nt-rv-laws{gap:6pt}.nt-printing .nt-rv-law{padding:6pt 10pt;border-left:3pt solid var(--rv-ink);border-radius:0 6pt 6pt 0;background:var(--rv-tint);-moz-column-break-inside:avoid;break-inside:avoid}.nt-printing .nt-rv-doc .nt-rv-law-name{color:var(--rv-ink);margin-bottom:1pt}.nt-printing .nt-rv-eqs{gap:5pt}.nt-printing .nt-rv-eq{padding:4pt 10pt;border:.75pt solid var(--rv-edge);border-radius:6pt;background:var(--rv-tint);text-align:center;-moz-column-break-inside:avoid;break-inside:avoid}.nt-printing .nt-rv-eq-label{font-size:8pt;font-weight:600;color:var(--rv-ink)}.nt-printing .nt-rv-eq .nt-rv-math--display{overflow:visible}.nt-printing .nt-rv-eq .katex-display{margin:.15em 0}.nt-printing .nt-rv-eq .katex-display,.nt-printing .nt-rv-eq .katex-display>.katex{text-align:center}.nt-printing .nt-rv-diagrams{gap:7pt}.nt-printing .nt-rv-diagram{gap:8pt;-moz-column-break-inside:avoid;break-inside:avoid}.nt-printing .nt-rv-draw{padding:.5pt 6pt;border:.75pt solid var(--rv-edge);background:var(--rv-tint);color:var(--rv-ink);font-size:7pt}.nt-printing .nt-rv-diagram-name{color:var(--print-text)}.nt-printing .nt-rv-labels{margin-top:3pt;gap:3pt}.nt-printing .nt-rv-labels li{padding:0 6pt;border:.5pt solid var(--rv-edge);background:var(--rv-tint);font-size:8pt}.nt-printing .nt-rv-doc .nt-rv-tip{margin-top:3pt;font-size:8.5pt}.nt-printing .nt-rv-fig{-moz-column-break-inside:avoid;break-inside:avoid}.nt-printing .nt-rv-fig-frame{padding:6pt;border:.75pt solid var(--rv-edge);border-radius:6pt;background:var(--manim-canvas-light)}.nt-printing .nt-rv-fig-frame img[data-still=light]{display:block}.nt-printing .nt-rv-fig-frame img[data-still=dark]{display:none}.nt-printing .nt-rv-fig-img{max-width:70%;max-height:9cm}.nt-printing .nt-rv-fig-caption{gap:8pt;margin-top:4pt}.nt-printing .nt-rv-fig-labels{margin-top:2pt;font-size:8pt;color:var(--print-muted)}.nt-printing .nt-rv-diff{border:.75pt solid var(--rv-edge);border-radius:6pt;font-size:9pt}.nt-printing .nt-rv-diff-row{gap:0 10pt;padding:4pt 9pt;-moz-column-break-inside:avoid;break-inside:avoid}.nt-printing .nt-rv-diff-row+.nt-rv-diff-row{border-top:.5pt solid color-mix(in srgb,var(--rv-ink) 16%,var(--print-paper))}.nt-printing .nt-rv-diff-row:nth-child(odd):not(.nt-rv-diff-row--head){background:color-mix(in srgb,var(--rv-ink) 5%,var(--print-paper))}.nt-printing .nt-rv-diff-row--head{background:color-mix(in srgb,var(--rv-ink) 15%,var(--print-paper));color:color-mix(in srgb,var(--rv-ink) 70%,var(--print-text));font-size:8.5pt}.nt-printing .nt-rv-diff-feature,.nt-printing .nt-rv-diff-row--head .nt-rv-diff-feature{color:var(--rv-ink)}.nt-printing .nt-rv-frames{gap:7pt}.nt-printing .nt-rv-frame{padding:0;border:.75pt solid var(--rv-edge);border-radius:7pt;background:var(--print-paper);overflow:hidden;-moz-column-break-inside:avoid;break-inside:avoid}.nt-printing .nt-rv-marks{position:absolute;top:5pt;right:8pt;float:none;margin:0;padding:.5pt 6pt;background:var(--rv-ink);color:var(--print-paper);font-size:7.5pt}.nt-printing .nt-rv-doc .nt-rv-frame-q{margin:0;padding:5pt 62pt 5pt 10pt;border-bottom:.75pt solid var(--rv-edge);background:var(--rv-tint);color:var(--print-text)}.nt-printing .nt-rv-steps{gap:3pt;margin:6pt 10pt 7pt;padding-left:8pt;border-left:2pt solid var(--rv-edge)}.nt-printing .nt-rv-steps li{grid-template-columns:1.4em minmax(0,1fr) auto}.nt-printing .nt-rv-steps li:after,.nt-printing .nt-rv-steps li:before{color:var(--rv-ink);font-weight:700}.nt-printing .nt-rv-steps li:after{padding:0 5pt;border-radius:9999px;background:color-mix(in srgb,var(--rv-ink) 12%,var(--print-paper));font-size:7pt}.nt-printing .nt-rv-steps li:not([data-marks]):after{content:none}.nt-printing .nt-rv-steps[hidden]{display:flex!important}.nt-printing .nt-rv-losers{gap:3pt;padding:6pt 10pt;border:.75pt solid var(--rv-edge);border-left:3pt solid var(--rv-ink);border-radius:0 6pt 6pt 0;background:var(--rv-tint)}.nt-printing .nt-rv-losers li{padding-left:12pt;-moz-column-break-inside:avoid;break-inside:avoid}.nt-printing .nt-rv-losers li:before{top:.6em;width:5pt;height:5pt;background:var(--rv-ink)}.nt-printing .nt-rv-fgroup{border:.75pt solid color-mix(in srgb,var(--print-brand) 28%,var(--print-paper));border-left:3pt solid var(--print-brand);border-radius:0 7pt 7pt 0;overflow:hidden;-moz-column-break-inside:avoid;break-inside:avoid}.nt-printing .nt-rv-fgroup+.nt-rv-fgroup{margin-top:10pt}.nt-printing .nt-rv-fgroup h2{margin:0;border-left:none;border-bottom:.75pt solid color-mix(in srgb,var(--print-brand) 28%,var(--print-paper));border-radius:0;font-size:11pt}.nt-printing .nt-rv-formulas{border-top:none}.nt-printing .nt-rv-formula{grid-template-columns:minmax(0,.38fr) minmax(0,1fr);gap:2pt 14pt;padding:4pt 10pt;border-bottom:.5pt solid color-mix(in srgb,var(--print-brand) 12%,var(--print-paper));-moz-column-break-inside:avoid;break-inside:avoid}.nt-printing .nt-rv-formula:last-child{border-bottom:none}.nt-printing .nt-rv-formula:nth-child(2n){background:color-mix(in srgb,var(--print-brand) 5%,var(--print-paper))}.nt-printing .nt-rv-formula dt{color:var(--print-brand-deep);font-size:9pt}.nt-printing .nt-rv-condition{color:var(--print-muted);font-size:8pt}.nt-printing .nt-rv-mark{background:var(--nt-rv-mark)}.nt-printing .nt-rv-flash{animation:none;background:none}.nt-printing .nt-rv-fgroup,.nt-printing .nt-rv-topic{-moz-column-break-before:auto;break-before:auto}.nt-printing :is(h2,h3){-moz-column-break-after:avoid;break-after:avoid}}html[data-skin=classroom] .nt-rv-sheet{border-radius:var(--skin-radius-card)}html[data-skin=sketchbook] .nt-rv-sheet{border:var(--skin-line) solid var(--skin-ink);border-radius:var(--skin-wobble-a)}html[data-skin=sketchbook] .nt-rv-sheet:nth-child(3n+2){border-radius:var(--skin-wobble-b)}html[data-skin=sketchbook] .nt-rv-reveal,html[data-skin=sketchbook] .nt-rv-selbar{border:var(--skin-line) solid var(--skin-ink)}html[data-skin=sketchbook] .nt-rv-reader-bottom{border-width:var(--skin-line) 0 0 0}html[data-skin=sketchbook] .nt-rv-diff,html[data-skin=sketchbook] .nt-rv-fig-frame,html[data-skin=sketchbook] .nt-rv-frame,html[data-skin=sketchbook] .nt-rv-map{border-radius:var(--skin-wobble-sm)}.fc-deck{--fc-easy:color-mix(in srgb,var(--ok) 78%,var(--text));--fc-medium:color-mix(in srgb,var(--warn) 78%,var(--text));--fc-hard:color-mix(in srgb,var(--bad) 78%,var(--text));display:flex;flex-direction:column;gap:16px}.fc-deck :focus-visible{outline:2px solid var(--brand);outline-offset:2px}.fc-row{align-items:center;flex-wrap:wrap}.fc-chips,.fc-row{display:flex;gap:8px}.fc-chips--scroll{overflow-x:auto;scrollbar-width:none;padding:3px;margin:-3px}.fc-chips--scroll::-webkit-scrollbar{display:none}.fc-chip{flex-shrink:0;display:inline-flex;align-items:center;min-height:44px;padding:0 14px;border-radius:9999px;border:1px solid var(--border);background:var(--surface);color:var(--text-muted);font-family:inherit;font-size:13px;font-weight:600;white-space:nowrap;cursor:pointer;transition:background .14s ease,border-color .14s ease,color .14s ease}.fc-chip:hover{background:color-mix(in srgb,var(--text) 7%,transparent);color:var(--text)}.fc-chip[aria-pressed=true]{border-color:color-mix(in srgb,var(--brand) 55%,transparent);background:color-mix(in srgb,var(--brand) 16%,transparent);color:var(--text)}.fc-chip-label{max-width:22ch;overflow:hidden;text-overflow:ellipsis}.fc-chip[data-difficulty=easy][aria-pressed=true]{border-color:color-mix(in srgb,var(--ok) 45%,transparent);background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--fc-easy)}.fc-chip[data-difficulty=medium][aria-pressed=true]{border-color:color-mix(in srgb,var(--warn) 45%,transparent);background:color-mix(in srgb,var(--warn) 14%,transparent);color:var(--fc-medium)}.fc-chip[data-difficulty=hard][aria-pressed=true]{border-color:color-mix(in srgb,var(--bad) 45%,transparent);background:color-mix(in srgb,var(--bad) 14%,transparent);color:var(--fc-hard)}.fc-known-count{margin-left:auto;font-size:13px;font-variant-numeric:tabular-nums;color:var(--text-muted)}.fc-card-wrap{width:100%;max-width:32rem;margin:0 auto}.fc-card{width:100%;padding:0;border:none;background:none;color:inherit;font:inherit;text-align:inherit;min-height:300px;border-radius:1rem;cursor:pointer;-webkit-tap-highlight-color:transparent}.fc-card:focus-visible{outline-offset:4px}.fc-face{display:flex;flex-direction:column;padding:20px;border-radius:1rem;border:1px solid color-mix(in srgb,var(--brand) 22%,transparent);color:var(--text)}.fc-face--back{border-color:color-mix(in srgb,var(--warn) 26%,transparent)}.fc-card-meta{display:flex;justify-content:space-between;gap:8px;margin-bottom:16px}.fc-tag{padding:2px 10px;border-radius:9999px;background:color-mix(in srgb,var(--text) 7%,transparent);color:var(--text-muted);font-size:12px;font-weight:600;line-height:1.5;text-transform:capitalize}.fc-tag[data-difficulty=easy]{background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--fc-easy)}.fc-tag[data-difficulty=medium]{background:color-mix(in srgb,var(--warn) 14%,transparent);color:var(--fc-medium)}.fc-tag[data-difficulty=hard]{background:color-mix(in srgb,var(--bad) 14%,transparent);color:var(--fc-hard)}.fc-face-body{flex:1;font-size:15px;line-height:1.6}.fc-face-body--front{display:flex;align-items:center;justify-content:center;min-height:180px;text-align:center;font-size:18px;font-weight:600}.fc-face-body .katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden}.fc-face .katex-mathml annotation{display:none}.fc-hint{gap:6px;margin:16px 0 0;font-size:12px;color:var(--text-muted)}.fc-hint,.fc-nav{display:flex;align-items:center;justify-content:center}.fc-nav{gap:24px}.fc-round{display:grid;place-items:center;width:48px;height:48px;border-radius:9999px;border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;transition:background .14s ease,opacity .14s ease}.fc-round:hover:not(:disabled){background:color-mix(in srgb,var(--text) 8%,transparent)}.fc-round:disabled{opacity:.35;cursor:default}.fc-counter{min-width:4.5em;text-align:center;font-size:14px;font-weight:600;font-variant-numeric:tabular-nums;color:var(--text)}.fc-progress{height:4px;border-radius:9999px;background:color-mix(in srgb,var(--text) 9%,transparent)}.fc-progress-fill{height:100%;border-radius:inherit;background:var(--brand);transition:width .3s ease}.fc-actions{display:flex;align-items:center;justify-content:center;gap:12px}.fc-action{display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:0 18px;border-radius:12px;border:1px solid var(--border);background:transparent;color:var(--text);font-family:inherit;font-size:14px;font-weight:600;cursor:pointer;transition:background .14s ease,border-color .14s ease,color .14s ease}.fc-action:hover{background:color-mix(in srgb,var(--text) 7%,transparent)}.fc-action--known .material-symbols-outlined{color:var(--fc-easy)}.fc-action--known[aria-pressed=true]{border-color:color-mix(in srgb,var(--ok) 45%,transparent);background:color-mix(in srgb,var(--ok) 14%,transparent);color:var(--fc-easy)}.fc-empty{padding:48px 24px;border:1px dashed var(--border);border-radius:1rem;text-align:center;font-size:14px;color:var(--text-muted)}@media (prefers-reduced-motion:reduce){.fc-deck .flashcard-inner,.fc-progress-fill{transition:none}}html[data-skin=sketchbook] .fc-action,html[data-skin=sketchbook] .fc-face,html[data-skin=sketchbook] .fc-round{border:var(--skin-line) solid var(--skin-ink)}html[data-skin=sketchbook] .fc-face{border-radius:var(--skin-wobble-a)}@media (max-width:639.98px){.fc-deck{gap:12px}.fc-card{min-height:248px}.fc-face{padding:16px}.fc-card-meta{margin-bottom:10px}.fc-face-body--front{min-height:136px}.fc-hint{margin-top:10px}}