@font-face{font-family:"IBM Plex Sans Fallback";src:local("Arial"),local("ArialMT");font-style:normal;font-weight:400;size-adjust:100.6%;ascent-override:101.89%;descent-override:27.34%;line-gap-override:0%}@font-face{font-family:"IBM Plex Sans Fallback";src:local("Arial Bold"),local("Arial-BoldMT");font-style:normal;font-weight:600;size-adjust:96.95%;ascent-override:105.73%;descent-override:28.37%;line-gap-override:0%}@font-face{font-family:"IBM Plex Mono Fallback";src:local("Courier New"),local("CourierNewPSMT");font-style:normal;font-weight:500;size-adjust:99.98%;ascent-override:102.6%;descent-override:27.6%;line-gap-override:0%}@font-face{font-family:"IBM Plex Serif Fallback";src:local("Georgia Italic"),local("Georgia-Italic");font-style:italic;font-weight:400;size-adjust:93.85%;ascent-override:109.3%;descent-override:29.4%;line-gap-override:0%}@font-face{font-family:"IBM Plex Serif";src:url("ibm-plex-serif-400-italic-latin.woff2") format("woff2");font-style:italic;font-weight:400;ascent-override:102.5%;descent-override:27.5%;line-gap-override:0%;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url("ibm-plex-sans-400-latin.woff2") format("woff2");font-style:normal;font-weight:400;font-display:swap}
@font-face{font-family:"IBM Plex Sans";src:url("ibm-plex-sans-400-latin.woff2") format("woff2");font-style:normal;font-weight:600;font-display:swap}
:root{--paper:#f3f0e9;--ink:#17191b;--blue:#2349d8;--line:#ccc8bf;--muted:#62615e}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"IBM Plex Sans","IBM Plex Sans Fallback",Arial,Helvetica,sans-serif;-webkit-text-size-adjust:100%}
a{color:inherit}
.shell{width:min(1280px,calc(100% - 64px));margin-inline:auto}
.header{display:flex;align-items:center;justify-content:space-between;min-height:88px;border-bottom:1px solid var(--ink);gap:24px}
.brand{display:flex;align-items:center;min-height:44px;font-size:20px;font-weight:600;letter-spacing:-.04em;text-decoration:none}
.brand i{font-style:normal;color:var(--blue)}
.brand-mark{display:inline-grid;place-items:center;width:36px;height:36px;margin-right:10px;background:var(--blue);color:#fff}
.brand-mark svg{width:62%;height:62%;stroke:currentColor;fill:none;stroke-width:2.4}
.eyebrow{display:flex;align-items:center;gap:10px;margin:0 0 20px;color:var(--blue);font-size:11px;letter-spacing:.13em;font-weight:800}
.eyebrow:before{content:"";width:28px;height:2px;background:var(--blue)}
h1{margin:0;font-size:clamp(40px,6vw,88px);line-height:.96;letter-spacing:-.065em;font-weight:600}
h1 em{font-family:"IBM Plex Serif","IBM Plex Serif Fallback",Georgia,serif;font-style:italic;font-weight:400;letter-spacing:-.06em}
.intro{padding:56px 0 40px}
.intro p.lead{max-width:56ch;margin:28px 0 0;color:var(--muted);font-size:17px;line-height:1.55}
.guide-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--ink)}
.guide-item{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px;align-items:baseline;padding:26px 0;border-bottom:1px solid var(--line)}
.number{grid-column:1;color:var(--muted);font-size:11px;letter-spacing:.13em;font-weight:800}
.guide-body{grid-column:2/span 8}
.guide-tag{display:block;margin-bottom:8px;color:var(--blue);font-size:11px;letter-spacing:.13em;font-weight:800}
h2{margin:0;font-size:clamp(20px,2vw,26px);line-height:1.22;letter-spacing:-.03em;font-weight:600}
.guide-soon{grid-column:11/span 2;justify-self:end;padding:6px 10px;border:1px solid var(--line);color:var(--muted);font-size:11px;letter-spacing:.13em;font-weight:800;text-transform:uppercase;white-space:nowrap}
.cta{margin:40px 0 96px}
.btn{display:inline-flex;align-items:center;gap:12px;min-height:52px;padding:0 24px;background:var(--ink);color:#fff;font-size:15px;font-weight:600;text-decoration:none}
.btn:hover{background:var(--blue)}
.btn:focus-visible,.brand:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
.footer{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));align-items:start;gap:24px;padding:36px max(32px,calc((100% - 1280px)/2));background:var(--blue);color:#fff}
.footer strong{grid-column:1/span 3;font-size:24px;line-height:1.5;letter-spacing:-.06em;font-weight:700}
.footer p{grid-column:4/span 9;max-width:65ch;margin:0;font-size:13px;line-height:1.5;color:#dbe2ff}
.footer a{color:#dbe2ff;font-weight:800;text-underline-offset:3px}
.footer a:hover{color:#fff;text-decoration:underline}
.footer a:focus-visible{outline:3px solid currentColor;outline-offset:3px}
@media(max-width:900px){.guide-body{grid-column:2/span 7}.guide-soon{grid-column:9/span 4}}
@media(max-width:700px){
  .shell{width:calc(100% - 32px)}
  .brand{font-size:17px}
  .brand-mark{width:30px;height:30px;margin-right:8px}
  .header{min-height:72px}
  .intro{padding:36px 0 28px}
  .guide-item{grid-template-columns:auto 1fr;gap:6px 14px;padding:20px 0}
  .number{grid-column:1}
  .guide-body{grid-column:2}
  .number{grid-row:1}
  .guide-body{grid-row:1}
  .guide-soon{grid-column:2;grid-row:1;justify-self:end;align-self:start;margin:0;padding:3px 7px;font-size:10px}
  .btn{width:100%;justify-content:space-between}
  .footer{grid-template-columns:1fr;gap:16px;padding:28px 22px}
  .footer strong,.footer p{grid-column:1}
  .footer p{max-width:54ch}
  .footer a{display:inline-block;padding:14px 0}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.header{gap:16px}
.brand{flex:none}
.header-tools{display:flex;align-items:center;gap:28px}
.nav-links{display:flex;gap:24px}
.header .nav-links a{display:inline-flex;align-items:center;min-height:44px;padding:0 2px;font-size:14px;line-height:1.2;font-weight:400;text-decoration:none;text-underline-offset:6px}
.header .nav-links a:hover{color:var(--blue);text-decoration:underline}
.header .nav-links a[aria-current]{text-decoration:underline}
.lang{position:relative}
.lang-btn{display:inline-flex;align-items:center;flex-direction:column;justify-content:center;gap:3px;width:44px;min-height:44px;padding:0;border:1px solid var(--ink);background:transparent;color:var(--ink);font-family:inherit;font-size:13px;font-weight:600;line-height:1;letter-spacing:.08em;cursor:pointer}
.lang-btn svg{width:10px;height:10px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;stroke-linejoin:round}
.lang-btn:hover{border-color:var(--blue);color:var(--blue)}
.lang-btn[aria-expanded="true"]{border-color:var(--ink)}
.lang-btn[aria-expanded="true"] svg{transform:rotate(180deg)}
.lang-btn:focus-visible,.header .nav-links a:focus-visible,.lang-menu a:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
.lang-menu{position:absolute;left:0;right:0;top:calc(100% - 1px);z-index:30;margin:0;padding:0;list-style:none;background:var(--paper);border:1px solid var(--ink)}
.lang-menu[hidden]{display:none}
.lang-menu a,.lang-off{display:flex;align-items:center;justify-content:center;min-height:44px;padding:0;font-size:13px;font-weight:600;letter-spacing:.08em;color:var(--ink);text-decoration:none}
.lang-menu a[aria-current]{background:var(--ink);color:#fff}
.lang-off{color:var(--muted);cursor:not-allowed}
.burger{display:none}
@media(max-width:700px){
  .header{position:relative;min-height:64px;padding:6px 0}
  .header-tools{gap:10px}
  .burger{display:inline-flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:44px;height:44px;padding:0;border:1px solid var(--ink);background:transparent;cursor:pointer}
  .burger span{display:block;width:18px;height:2px;background:var(--ink)}
  .burger:hover{border-color:var(--blue)}
  .burger:hover span{background:var(--blue)}
  .burger:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
  .burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .burger[aria-expanded="true"] span:nth-child(2){opacity:0}
  .burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .header-tools{position:relative;z-index:26}
  .brand{position:relative;z-index:27}
  .lang,.burger{position:relative;z-index:2}
  .header .nav-links{display:none;position:fixed;inset:0;align-self:stretch;z-index:1;flex-direction:column;gap:0;box-sizing:border-box;padding:64px 16px 24px;background:var(--paper);overflow-y:auto}
  .header .nav-links.is-open{display:flex}
  .header .nav-links a{min-height:64px;padding:0 4px;border-bottom:1px solid var(--line);font-size:28px;letter-spacing:-.03em}
  .header .nav-links a:first-child{border-top:1px solid var(--ink)}
  html.menu-open{overflow:hidden}
}
@media(prefers-reduced-motion:no-preference){.burger span{transition:transform .2s,opacity .15s}}
@media(prefers-reduced-motion:no-preference){.lang-btn svg{transition:transform .15s}}
/* Sticky header */
:root{--header-h:88px}
html{scroll-padding-top:var(--header-h)}
.header{position:sticky;top:0;z-index:20;background:var(--paper)}
@media(max-width:700px){:root{--header-h:64px}}
/* Footer note inside the mobile menu */
.nav-links .nav-note{display:none}
@media(max-width:700px){
  .header .nav-links .nav-note{display:block;max-width:54ch;margin:28px 0 0;padding:0 4px;color:var(--muted);font-size:14px;line-height:1.55;letter-spacing:normal}
  .header .nav-links .nav-note a{display:inline-block;min-height:0;padding:12px 0;margin:-12px 0;border:0;color:var(--blue);font-size:inherit;font-weight:800;letter-spacing:normal;text-decoration:underline;text-underline-offset:3px}
}
/* Italic accent words in headings use the accent colour */
h1 em{color:var(--blue)}

/* ---- Article pages ---- */
.crumbs{margin:28px 0 0;color:var(--muted);font-size:13px}
.crumbs a{text-underline-offset:3px}
.crumbs span[aria-hidden]{margin:0 6px}
.article{max-width:760px;padding:28px 0 40px}
.article h1{font-size:clamp(32px,4.6vw,60px);line-height:1.04;letter-spacing:-.05em}
.article .meta{margin:18px 0 0;color:var(--muted);font-size:13px}
.article .answer{margin:28px 0;padding:4px 0 4px 18px;border-left:3px solid var(--blue);font-size:19px;line-height:1.5}
.toc{margin:28px 0;padding:14px 0;border-top:1px solid var(--ink);border-bottom:1px solid var(--line)}
.toc strong{font-size:11px;letter-spacing:.13em;font-weight:800;color:var(--blue)}
.toc ol{margin:10px 0 0;padding-left:20px}
.toc li{margin:0;padding:6px 0;font-size:15px;line-height:1.5}
.toc a{text-underline-offset:3px}
.article-body h2{margin:44px 0 14px;font-size:clamp(24px,2.6vw,32px);line-height:1.15;letter-spacing:-.04em}
.article-body h3{margin:28px 0 8px;font-size:20px;line-height:1.25;letter-spacing:-.02em;font-weight:600}
.article-body p,.article-body li{max-width:68ch;font-size:17px;line-height:1.65}
.article-body ul,.article-body ol{padding-left:22px}
.article-body a{color:var(--blue);text-underline-offset:3px}
.sources,.related{margin:40px 0 0;padding-top:18px;border-top:1px solid var(--ink)}
.sources h2,.related h2{margin:0 0 10px;font-size:18px;letter-spacing:-.02em}
.sources li,.related li{margin:6px 0;font-size:15px;line-height:1.5;word-break:break-word}
.sources a,.related a{color:var(--blue);text-underline-offset:3px}
.disclaimer{margin:28px 0 0;padding:14px 16px;background:#fff;border:1px solid var(--line);color:var(--muted);font-size:14px;line-height:1.5}
.article .cta{margin:32px 0 0}
@media(max-width:700px){.article{padding:12px 0 24px}.article .answer{font-size:17px}.article-body p,.article-body li{font-size:16px}}

.guide-item h2 a,.guide-item h3 a{text-decoration:none;color:inherit}
.guide-item h2 a:hover,.guide-item h3 a:hover{color:var(--blue);text-decoration:underline;text-underline-offset:4px}
.guide-item h2 a:focus-visible,.guide-item h3 a:focus-visible{outline:3px solid var(--blue);outline-offset:3px}
/* Shared chrome: identical content width, header, logo and footer on every page and language. */
.shell{width:min(1280px,calc(100% - 64px));margin-inline:auto}
.header{min-height:88px}
.brand{display:flex;align-items:center;min-height:44px;font-size:20px;font-weight:900;letter-spacing:-.07em;white-space:nowrap;text-decoration:none}
.brand i{font-style:normal;color:var(--blue)}
.brand-mark{width:36px;height:36px;margin-right:10px}
.footer{padding:36px max(32px,calc((100% - 1280px)/2))}
.footer strong{font-size:24px;line-height:1.5;letter-spacing:-.06em;font-weight:700}
.footer p{font-size:13px;line-height:1.5}
.footer a,.footer p a{font-weight:400}
@media(max-width:700px){.shell{width:calc(100% - 32px)}.header{min-height:64px}.brand{font-size:17px}.brand-mark{width:30px;height:30px;margin-right:8px}.footer{padding:28px 22px}}
.skip{position:absolute;left:-9999px;top:8px;padding:12px;background:#fff;color:#17191b;z-index:30}
.skip:focus{left:8px}
/* Guides index: heading on the left, short text on the right (same layout as the home page section heads). */
.intro-head{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));align-items:end;gap:24px}
.intro-head>div{grid-column:1/span 8}
.intro-head .eyebrow{margin-bottom:20px}
.intro-side{grid-column:9/span 4;max-width:38ch;margin:0 0 6px;color:var(--muted);font-size:16px;line-height:1.55}
@media(max-width:900px){.intro-head>div{grid-column:1/span 7}.intro-side{grid-column:8/span 5}}
@media(max-width:700px){.intro-head{grid-template-columns:1fr;gap:0}.intro-head>div,.intro-side{grid-column:1}.intro-side{max-width:42ch;margin:20px 0 0;font-size:15px}}
/* Guides index: side text is centred against the whole heading block. */
@media(min-width:1025px){
.intro-head{align-items:center;row-gap:0;grid-template-rows:auto auto}
.intro-head>div{display:contents}
.intro-head .eyebrow{grid-column:1/span 8;grid-row:1}
.intro-head h1{grid-column:1/span 8;grid-row:2}
.intro-side{grid-column:9/span 4;grid-row:1/span 2;align-self:center;margin:0}
}
/* Tablets and phones: the side text drops under the heading. */
@media(max-width:1024px){
.intro-head{grid-template-columns:1fr;gap:0}
.intro-head>div{display:block;grid-column:1}
.intro-side{grid-column:1;grid-row:auto;max-width:52ch;margin:20px 0 0}
}
/* Heading blocks are 10% narrower than the width available to them. */
.intro-head h1,.article h1{max-width:90%}
/* Mobile hardening: no text-size inflation, no tap delay, labels never below 12px, touch targets of 44px. */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
a,button,summary{touch-action:manipulation}
.eyebrow,.guide-tag,.number,.sponsor-pill,.visual-tag,.featured-label,.sponsor-meta,.sponsor-meta a,.sponsor-meta span{font-size:12px}
.nav-links{overscroll-behavior:contain}
.lang-menu a{min-width:44px}
.header .nav-links .nav-note a{padding:14px 0;margin:-14px 0}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;margin-top:12px}
.crumbs a{display:inline-flex;align-items:center;min-height:44px;padding:0 2px}