@font-face{font-family:inter;src:url(../media/inter_var-s.p.0rpdhg_4ubdtf.woff2)format("woff2");font-display:swap;font-weight:100 900}@font-face{font-family:inter Fallback;src:local(Arial);ascent-override:89.79%;descent-override:22.36%;line-gap-override:0.0%;size-adjust:107.89%}.inter_53524e55-module__cSljcW__className{font-family:inter,inter Fallback}.inter_53524e55-module__cSljcW__variable{--font-inter:"inter", "inter Fallback"}
@font-face{font-family:newsreader;src:url(../media/newsreader_400-s.p.18q64_vlk_qen.woff2)format("woff2");font-display:swap;font-weight:400;font-style:normal}@font-face{font-family:newsreader;src:url(../media/newsreader_400_italic-s.p.02qxcef_o81-x.woff2)format("woff2");font-display:swap;font-weight:400;font-style:italic}@font-face{font-family:newsreader;src:url(../media/newsreader_600-s.p.11r0piw5alamn.woff2)format("woff2");font-display:swap;font-weight:600;font-style:normal}@font-face{font-family:newsreader;src:url(../media/newsreader_700-s.p.25lj7ic-nyizz.woff2)format("woff2");font-display:swap;font-weight:700;font-style:normal}@font-face{font-family:newsreader Fallback;src:local(Arial);ascent-override:76.71%;descent-override:27.66%;line-gap-override:0.0%;size-adjust:95.82%}.newsreader_3daac68c-module__cJbmZW__className{font-family:newsreader,newsreader Fallback}.newsreader_3daac68c-module__cJbmZW__variable{--font-newsreader:"newsreader", "newsreader Fallback"}
:root{--ink:#14161c;--ink-2:#2b2f3a;--muted:#5e6475;--faint:#8a90a0;--rule:#e4e6ed;--panel:#f5f6f9;--paper:#fff;--hi:#ffe14d;--hi-soft:#fff4bf;--beg:#1e9e5a;--int:#2563eb;--adv:#14161c;--ok:#1e9e5a;--ok-soft:#e7f4ec;--ok-ink:#14653b;--sponsor-soft:#f3f0ff;--danger:#b42318;--serif:var(--font-newsreader), Georgia, "Times New Roman", serif;--sans:var(--font-inter), Arial, Helvetica, sans-serif;--mono:ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;--maxw:1440px;--gutter:48px;--radius:14px}@media (max-width:1100px){:root{--gutter:32px}}@media (max-width:760px){:root{--gutter:18px}}*,:before,:after{box-sizing:border-box}*{margin:0;padding:0}html{-moz-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:24px}html,body{background:var(--paper);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:15px;line-height:1.5}body{flex-direction:column;min-height:100vh;display:flex}main{flex:1 0 auto}a{color:inherit;text-decoration:none}img,svg{max-width:100%;display:block}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer;background:0 0;border:0}ul[role=list],ol[role=list]{list-style:none}:focus-visible{outline:3px solid var(--int);outline-offset:2px;border-radius:6px}.skip-link{z-index:100;background:var(--ink);color:#fff;border-radius:10px;padding:10px 14px;font-weight:650;position:absolute;top:-48px;left:12px}.skip-link:focus{top:12px}.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;position:absolute!important}.container{width:100%;max-width:var(--maxw);padding-left:var(--gutter);padding-right:var(--gutter);margin:0 auto}.logo{font-family:var(--serif);letter-spacing:-.02em;color:var(--ink);align-items:baseline;font-size:30px;font-weight:700;line-height:1;display:inline-flex}.logo .un{z-index:0;position:relative}.logo .un:before{content:"";background:var(--hi);z-index:-1;border-radius:3px;position:absolute;inset:38% -3px -2px -4px;transform:skew(-8deg)rotate(-1.5deg)}.logo.sm{font-size:22px}.logo.lg{font-size:44px}.hl{background:linear-gradient(transparent 40%, var(--hi) 40%, var(--hi) 92%, transparent 92%);padding:0 2px}.lvl{color:var(--ink-2);white-space:nowrap;align-items:center;gap:6px;font-size:12px;font-weight:600;display:inline-flex}.shape{flex:none;width:9px;height:9px;display:inline-block}.shape.beg{background:var(--beg);border-radius:50%}.shape.int{background:var(--int)}.shape.adv{background:var(--adv);transform:rotate(45deg)scale(.86)}.switch{background:var(--panel);border:1px solid var(--rule);border-radius:999px;gap:2px;padding:4px;display:inline-flex}.switch .opt{color:var(--muted);white-space:nowrap;border-radius:999px;align-items:center;gap:7px;padding:7px 14px;font-size:13px;font-weight:600;display:inline-flex}.switch .opt:hover{color:var(--ink)}.switch .opt.on,html[data-level=beginner] .switch .opt[data-level-opt=beginner],html[data-level=intermediate] .switch .opt[data-level-opt=intermediate],html[data-level=advanced] .switch .opt[data-level-opt=advanced]{background:var(--paper);color:var(--ink);box-shadow:0 1px 2px #14161c1f, 0 0 0 1px var(--rule)}[data-level-content]{display:none}html[data-level=beginner] [data-level-content=beginner],html[data-level=intermediate] [data-level-content=intermediate],html[data-level=advanced] [data-level-content=advanced]{display:revert}html[data-level=beginner] [data-level-content=beginner].is-flex,html[data-level=intermediate] [data-level-content=intermediate].is-flex,html[data-level=advanced] [data-level-content=advanced].is-flex{display:flex}html:not([data-editions~=uk]) [data-region=uk]{display:none}.utility{border-bottom:1px solid var(--rule);color:var(--muted);font-size:12.5px}.utility .container{justify-content:space-between;align-items:center;gap:16px;min-height:44px;display:flex}.utility .edition{flex-wrap:wrap;align-items:center;gap:6px;display:inline-flex}.utility .edition b{color:var(--ink);font-weight:600}.pill{border:1px solid var(--rule);color:var(--ink-2);background:var(--paper);white-space:nowrap;border-radius:999px;align-items:center;gap:6px;padding:4px 10px;font-size:12px;font-weight:600;display:inline-flex}.pill.dark{background:var(--ink);color:#fff;border-color:var(--ink)}.pill[aria-disabled=true]{color:var(--muted);cursor:not-allowed;border-style:dashed}.masthead{border-bottom:1px solid var(--rule);background:var(--paper)}.masthead .container{justify-content:space-between;align-items:center;gap:24px;min-height:72px;display:flex}.nav{color:var(--ink-2);align-items:center;gap:28px;font-size:14.5px;font-weight:600;display:flex}.nav a{padding:6px 0;position:relative}.nav a:hover,.nav a[aria-current=page]{color:var(--ink)}.nav a[aria-current=page]:after{content:"";background:var(--ink);height:3px;position:absolute;bottom:-20px;left:0;right:0}.nav .pro{align-items:center;gap:6px;display:inline-flex}.tag-pro{letter-spacing:.06em;background:var(--ink);color:var(--hi);border-radius:4px;padding:2px 6px;font-size:10.5px;font-weight:800}.btn{border:1px solid var(--ink);background:var(--ink);color:#fff;white-space:nowrap;border-radius:10px;justify-content:center;align-items:center;gap:8px;padding:10px 16px;font-size:14px;font-weight:650;transition:transform .12s,box-shadow .12s,background-color .12s;display:inline-flex}.btn:hover{box-shadow:0 4px 12px #14161c29}.btn:active{transform:translateY(1px)}.btn.ghost{background:var(--paper);color:var(--ink);border-color:var(--rule)}.btn.ghost:hover{border-color:var(--ink)}.btn.hi{background:var(--hi);color:var(--ink);border-color:var(--hi)}.btn.sm{border-radius:8px;padding:7px 12px;font-size:13px}.btn.block{width:100%}.btn[disabled],.btn[aria-disabled=true]{opacity:.55;cursor:not-allowed;box-shadow:none}.kicker{letter-spacing:.08em;text-transform:uppercase;color:var(--muted);flex-wrap:wrap;align-items:center;gap:10px;font-size:11.5px;font-weight:700;display:flex}.kicker .cat{color:var(--ink)}.sep{background:var(--muted);border-radius:50%;flex:none;width:3px;height:3px;display:inline-block}.serif{font-family:var(--serif);letter-spacing:-.01em}.sponsor-label{letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-size:10.5px;font-weight:700}.card{border:1px solid var(--rule);border-radius:var(--radius);background:var(--paper)}.section-label{letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-size:12px;font-weight:700}.prose{color:var(--ink);font-size:17px;line-height:1.65}.prose>*+*{margin-top:14px}.prose h2{font-family:var(--serif);letter-spacing:-.01em;margin-top:32px;font-size:26px;line-height:1.2}.prose h3{margin-top:22px;font-size:17px}.prose ul,.prose ol{padding-left:22px}.prose li+li{margin-top:6px}.prose a{text-underline-offset:3px;text-decoration:underline;text-decoration-thickness:1.5px}.prose a.btn{text-decoration:none}.prose code{font-family:var(--mono);background:var(--panel);border:1px solid var(--rule);border-radius:6px;padding:1px 6px;font-size:.88em}.field-label{color:var(--ink-2);margin-bottom:6px;font-size:13px;font-weight:650;display:block}.input{border:1.5px solid var(--rule);background:var(--paper);border-radius:10px;width:100%;padding:11px 12px;font-size:15px}.input:focus-visible{outline:3px solid var(--int);outline-offset:1px;border-color:var(--ink)}.form-error{color:var(--danger);margin-top:8px;font-size:13px;font-weight:600}.form-ok{color:var(--ok-ink);margin-top:8px;font-size:13.5px;font-weight:650}.sample-banner{background:var(--hi-soft);color:var(--ink-2);border-bottom:1px solid #f0e2a0;font-size:13px}.sample-banner .container{flex-wrap:wrap;align-items:center;gap:8px;padding-top:8px;padding-bottom:8px;display:flex}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}@media (max-width:760px){html,body{font-size:16px}.masthead .container{min-height:60px}.logo{font-size:26px}}.utility-actions{align-items:center;gap:16px;display:flex}.utility-link{color:var(--ink-2);font-weight:600}.utility-link:hover{color:var(--ink);text-underline-offset:3px;text-decoration:underline}.edition-picker{position:relative}.edition-button{color:var(--muted);border-radius:6px;align-items:center;gap:5px;padding:4px 2px;display:inline-flex}.edition-button b{color:var(--ink);font-weight:600}.edition-button:hover{color:var(--ink)}.edition-panel{z-index:30;background:var(--paper);border:1px solid var(--rule);border-radius:12px;min-width:240px;padding:8px;position:absolute;top:calc(100% + 8px);left:0;box-shadow:0 16px 36px #14161c29}.edition-option{color:var(--ink);cursor:pointer;border-radius:8px;grid-template-columns:18px 1fr auto;align-items:center;gap:10px;padding:9px 10px;font-size:14px;display:grid}.edition-option:hover{background:var(--panel)}.edition-option small{color:var(--muted);font-size:12px}.edition-option[data-soon]{color:var(--muted);cursor:not-allowed}.edition-option input{width:16px;height:16px;accent-color:var(--ink)}.masthead-left{align-items:center;gap:44px;display:flex}.masthead-level{align-items:center;gap:14px;display:flex}.masthead.compact .container{min-height:64px}.masthead.compact .nav{font-size:14px}.masthead.compact .nav a[aria-current=page]:after{bottom:-17px}.masthead-actions{align-items:center;gap:12px;display:flex}.edition-pill{cursor:pointer}.edition-pill:hover{border-color:var(--ink)}.masthead-actions .edition-panel{left:auto;right:0}.read-at{color:var(--muted);font-size:12.5px;font-weight:600}.mobile-menu{display:none;position:relative}.mobile-panel{z-index:40;background:var(--paper);border:1px solid var(--rule);border-radius:14px;gap:4px;width:min(320px,100vw - 32px);padding:10px;display:grid;position:absolute;top:calc(100% + 10px);right:0;box-shadow:0 18px 40px #14161c2e}.mobile-panel a{border-radius:10px;align-items:center;gap:8px;padding:11px 12px;font-weight:650;display:flex}.mobile-panel a[aria-current=page]{background:var(--panel)}.mobile-panel a.btn{color:#fff;justify-content:center;margin-top:6px}@media (max-width:1100px){.masthead-left{gap:28px}.nav{gap:20px}.read-at{display:none}}@media (max-width:960px){.desktop-nav{display:none}.mobile-menu{display:block}.masthead .container{flex-wrap:wrap;row-gap:10px;padding-top:12px;padding-bottom:12px}.masthead-level{order:3;width:100%}.masthead-level .switch{justify-content:space-between;width:100%}.masthead-level .switch .opt{flex:1;justify-content:center;padding:8px 6px}.utility-link{display:none}}@media (max-width:520px){.utility .container{flex-wrap:wrap;padding-top:6px;padding-bottom:6px}.masthead-actions .btn{display:none}}.site-footer{border-top:1px solid var(--rule);background:var(--panel);margin-top:64px}.footer-top{grid-template-columns:minmax(220px,1fr) 2.2fr;gap:40px;padding:40px 0 24px;display:grid}.footer-tag{color:var(--muted);max-width:32ch;margin-top:12px;font-size:14px}.footer-links{grid-template-columns:repeat(4,1fr);gap:24px;display:grid}.footer-links h2{letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:10px;font-size:12px}.footer-links a{color:var(--ink-2);padding:4px 0;font-size:14px;font-weight:550;display:block}.footer-links a:hover{color:var(--ink);text-underline-offset:3px;text-decoration:underline}.footer-small{border-top:1px solid var(--rule);color:var(--muted);padding:18px 0 28px;font-size:12.5px}@media (max-width:860px){.footer-top{grid-template-columns:1fr}.footer-links{grid-template-columns:repeat(2,1fr)}}.consent{z-index:60;background:var(--ink);color:#fff;border-radius:14px;justify-content:space-between;align-items:center;gap:16px;max-width:760px;margin:0 auto;padding:14px 16px;font-size:14px;display:flex;position:fixed;bottom:16px;left:16px;right:16px;box-shadow:0 18px 40px #14161c4d}.consent a{text-underline-offset:3px;color:var(--hi);text-decoration:underline}.consent-actions{flex:none;gap:8px;display:flex}.consent .btn{border-color:#fff}.consent .btn.ghost{color:#fff;background:0 0;border-color:#ffffff8c}.consent .btn:not(.ghost){color:var(--ink);background:#fff}@media (max-width:600px){.consent{flex-direction:column;align-items:stretch}.consent-actions .btn{flex:1}}.levelbar{border:1px solid var(--rule);background:var(--panel);border-radius:14px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:22px;padding:12px 14px;display:flex}.levelbar .note{color:var(--muted);font-size:13px}@media (max-width:760px){.levelbar{padding:10px}.levelbar .switch{justify-content:space-between;width:100%}.levelbar .switch .opt{flex:1;justify-content:center;padding:8px 6px}}.lvl.on-dark{color:#c8ccd8}.edition-pills{flex-wrap:wrap;gap:8px;display:flex}.edition-pills button.pill{cursor:pointer}.edition-pills button.pill:disabled{cursor:default;opacity:1}.edition-pills .soon{color:var(--muted);font-size:10.5px;font-weight:700}.signup-field{gap:8px;display:flex}.signup-field .input{border:0;flex:1;min-width:0}.signup-form.light .signup-field .input{border:1.5px solid var(--rule)}.signup-form.dark .form-error{color:#ffb4a8}.hp{width:1px;height:1px;position:absolute;left:-10000px;overflow:hidden}.signup-done{font-size:14px;line-height:1.5}.signup-done.dark{color:#fff}.signup-done a{text-underline-offset:3px;text-decoration:underline}.signup-done.dark a{color:var(--hi)}@media (max-width:420px){.signup-field{flex-direction:column}}.chat{z-index:50;flex-direction:column;align-items:flex-end;gap:12px;display:flex;position:fixed;bottom:20px;right:20px}html[data-listening] .chat{bottom:92px}.chat{pointer-events:none}.chat>*{pointer-events:auto}body:has(.consent) .chat{display:none}.chat-launcher{background:var(--ink);color:#fff;border-radius:999px;align-items:center;gap:8px;padding:12px 18px;font-size:14px;font-weight:700;display:inline-flex;position:relative;box-shadow:0 10px 28px #14161c47}.chat-launcher:hover{box-shadow:0 12px 32px #14161c5c}.chat-dot{background:var(--hi);width:11px;height:11px;box-shadow:0 0 0 2px var(--ink);border-radius:50%;position:absolute;top:4px;right:6px}.chat-panel{background:var(--paper);border:1px solid var(--rule);border-radius:18px;flex-direction:column;width:min(390px,100vw - 24px);max-height:min(640px,100vh - 110px);display:flex;overflow:hidden;box-shadow:0 24px 60px #14161c47}.chat-head{background:var(--ink);color:#fff;justify-content:space-between;align-items:flex-start;gap:12px;padding:16px 18px;display:flex}.chat-head h2{font-family:var(--serif);font-size:19px;line-height:1.2}.chat-head p{color:#c8ccd8;margin-top:2px;font-size:13px}.chat-close{color:#fff;border-radius:8px;padding:4px}.chat-close:hover{background:#ffffff1f}.chat-body{gap:12px;padding:14px 16px 16px;display:grid;overflow-y:auto}.chat-note{color:var(--muted);font-size:13.5px;line-height:1.5}.chat-note a,.chat-field small a{text-underline-offset:3px;color:var(--ink);text-decoration:underline}.chat-form{gap:10px;display:grid}.chat-about{background:var(--hi-soft);border-radius:10px;padding:10px 12px;font-size:14px}.chat-about a{color:var(--ink);text-underline-offset:3px;font-weight:650;text-decoration:underline;display:block}.chat-field label{margin-bottom:4px;font-size:13px;font-weight:650;display:block}.chat-field small{color:var(--muted);margin-top:4px;font-size:12px;display:block}.chat-form textarea.input{resize:vertical;width:100%;min-height:72px;font-family:var(--sans);line-height:1.5}.chat-form .input{width:100%}.chat-actions{justify-content:space-between;align-items:center;gap:10px;display:flex}.chat-link{color:var(--muted);text-underline-offset:3px;justify-self:start;font-size:13px;font-weight:600;text-decoration:underline}.chat-link:hover{color:var(--ink)}.chat-log{gap:10px;list-style:none;display:grid}.chat-msg{gap:3px;max-width:88%;display:grid}.chat-msg p{white-space:pre-wrap;overflow-wrap:anywhere;border-radius:14px;padding:9px 12px;font-size:14px;line-height:1.5}.chat-msg.me{text-align:right;justify-self:end}.chat-msg.me p{background:var(--ink);color:#fff;text-align:left;border-bottom-right-radius:4px}.chat-msg.me p a{color:var(--hi)}.chat-msg.team p{background:var(--panel);border:1px solid var(--rule);border-bottom-left-radius:4px}.chat-msg.team p a{color:var(--int);text-decoration:underline}.chat-who{color:var(--muted);font-size:11.5px;font-weight:650}@media (max-width:600px){.chat{align-items:stretch;bottom:12px;left:12px;right:12px}.chat-launcher{align-self:flex-end;padding:12px 14px}.chat-panel{width:100%;max-height:calc(100vh - 90px)}}@media (prefers-reduced-motion:no-preference){.chat-panel{animation:.16s ease-out chat-in}}@keyframes chat-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}