:root{--paper:#f7f6f2;--ink:#17283b;--muted:#52606b;--teal:#276d68;--line:#d9dcd6;--mint:#e7eeea;--lavender:#e9e6f1;--font:'DM Sans',Arial,sans-serif;--display:'DM Serif Display',Georgia,serif;--gutter:clamp(24px,5.5vw,88px)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}::selection{background:#d3e5df;color:#142e2c}a{color:inherit;text-decoration-thickness:1px;text-underline-offset:5px}button,input{font:inherit;color:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.35;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--teal);outline-offset:5px}button{border:0;background:none}img{display:block;max-width:100%}svg{flex-shrink:0;vertical-align:middle}h1,h2,h3,p{margin:0}h1,h2,h3{font-family:var(--display);font-weight:400;line-height:1.12;letter-spacing:-.025em;text-wrap:balance}h1{font-size:clamp(42px,5.3vw,80px)}h2{font-size:clamp(30px,3vw,44px)}h3{font-size:clamp(26px,2.6vw,36px)}p{color:var(--muted)}[hidden]{display:none!important}.wrap{width:min(100% - var(--gutter)*2,1400px);margin-inline:auto}.sr-only,.skip-link:not(:focus){position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link:focus{position:fixed;inset:12px auto auto 12px;z-index:100;background:var(--paper);padding:12px}.site-header{position:sticky;top:0;background:var(--paper);border-bottom:1px solid var(--line);z-index:20}.header-inner{height:88px;width:min(100% - var(--gutter)*2,1400px);margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:inline-flex;align-items:center;gap:15px;text-decoration:none;white-space:nowrap}.brand-word{font-weight:700;font-size:28px;letter-spacing:-.04em}.brand-line{height:24px;width:1px;background:#8d969a}.brand-sub{font-size:12px;font-weight:600;letter-spacing:.14em}.main-nav{display:flex;gap:28px}.main-nav a{text-decoration:none;font-size:14px}.main-nav a:hover,.main-nav a[aria-current]{color:var(--teal);text-decoration:underline}.header-end{display:flex;align-items:center;gap:24px}.languages{display:flex;align-items:center;gap:9px;font-size:12px}.languages a{text-decoration:none;min-height:32px;display:grid;place-items:center}.languages a[aria-current]{border-bottom:1px solid var(--ink)}.languages span{color:#7b858e}.icon-button{display:grid;place-items:center;flex-shrink:0;width:42px;height:42px;border:1px solid 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span{height:100%;display:block;background:var(--teal);width:33.333%;transform-origin:left}.scroll-hint{font-size:12px;margin-inline-start:6px}.motion-toggle{width:34px;height:34px}.learning-note{background:var(--mint);padding:40px 44px;display:flex;justify-content:space-between;gap:40px;align-items:center;margin-block:36px 72px;border-radius:4px}.learning-note h2{font-size:32px}.learning-note p{max-width:620px;margin-top:14px;font-size:15px}.site-footer{display:flex;flex-wrap:wrap;justify-content:space-between;gap:28px;padding-block:38px 30px;border-top:1px solid var(--line);align-items:flex-start}.site-footer .brand-word{font-size:23px}.site-footer .brand-sub{font-size:10px}.site-footer p{font-size:12px;margin-top:10px}.site-footer nav{display:flex;flex-wrap:wrap;gap:26px;padding-top:8px}.site-footer nav a{font-size:12px;text-decoration:none}.site-footer nav a:hover{text-decoration:underline}.site-footer small{width:100%;font-size:10px;color:var(--muted)}.library{padding-block:72px 90px;min-height:70vh}.library-heading h1{max-width:800px}.library-heading>p:not(.eyebrow){margin-top:20px;font-size:19px}.library-heading .search-form{max-width:600px}.filter-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-block:42px 34px;border-bottom:1px solid var(--line);padding-bottom:24px}.filter{border:1px solid var(--line);border-radius:24px;padding:8px 19px;text-decoration:none;font-size:13px}.filter.active{background:var(--ink);color:var(--paper);border-color:var(--ink)}.filter:hover:not(.active){background:var(--mint)}.result-count{margin-inline-start:auto;font-size:12px;color:var(--muted)}.library-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:30px}.library-grid h3{font-size:31px}.empty-state{padding:70px 0;text-align:center}.empty-state a{display:inline-block;margin-top:20px;color:var(--teal)}.article-hero{display:grid;grid-template-columns:1.55fr 1fr;gap:64px;align-items:center;padding-block:52px 58px;border-bottom:1px solid var(--line)}.breadcrumb{display:flex;gap:12px;align-items:center;flex-wrap:wrap;font-size:12px;margin-bottom:28px;color:var(--muted)}.breadcrumb a{text-decoration:none}.breadcrumb a:hover{text-decoration:underline}.article-hero h1{font-size:clamp(40px,4.4vw,68px)}.article-deck{font-size:18px;margin-top:22px;max-width:650px}.article-hero>img{width:100%;aspect-ratio:1.2;object-fit:cover;border-radius:4px}.byline{display:flex;align-items:center;flex-wrap:wrap;gap:10px;font-size:11px;color:var(--muted);margin-top:24px}.byline a{color:var(--ink)}.article-layout{display:grid;grid-template-columns:230px minmax(0,740px);gap:clamp(35px,6vw,100px);justify-content:center;padding-block:58px 70px}.toc{position:sticky;top:118px;align-self:start;font-size:13px;border-inline-end:1px solid var(--line);padding-inline-end:24px}.toc>p{font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--ink);margin-bottom:20px}.toc ol{padding-inline-start:18px;margin:0 0 22px;list-style-type:decimal-leading-zero}.toc li{margin-bottom:14px;color:var(--muted);padding-inline-start:4px}.toc a{text-decoration:none}.toc a:hover,.toc a.active{color:var(--teal);text-decoration:underline}.toc .text-link{font-size:12px}.article-body{font-size:18px;line-height:1.85;min-width:0}.article-body p{color:#384957}.article-body .lead{font-family:var(--display);font-size:25px;line-height:1.5;color:var(--ink);letter-spacing:-.01em}.before-box{background:#efeee8;padding:26px 30px;margin-top:32px;border-radius:4px}.before-box h2{font-family:var(--font);font-weight:600;font-size:16px;letter-spacing:0;margin-bottom:12px}.before-box p{font-size:15px;line-height:1.8}.before-box small{display:block;font-size:11px;color:var(--muted);margin-top:16px}.article-step{margin-top:42px;scroll-margin-top:112px}.article-step h2{font-size:31px;margin-bottom:20px;display:flex;align-items:baseline;gap:18px}.article-step h2 span{font-family:var(--font);color:var(--teal);font-size:17px;font-weight:400;font-variant-numeric:tabular-nums;letter-spacing:0}.prompt-box{background:var(--mint);padding:28px;margin-block:42px;border-radius:4px;scroll-margin-top:112px}.prompt-box>div{display:flex;gap:16px;align-items:center;justify-content:space-between}.prompt-box h2{font-family:var(--font);font-size:16px;font-weight:500;letter-spacing:0}.copy-button{display:flex;align-items:center;gap:7px;font-size:11px;padding:8px;border:1px solid #b7c9c1;border-radius:5px}.copy-button:hover{background:#d6e5de}.prompt-box pre{font:14px/1.8 var(--font);white-space:pre-wrap;overflow-wrap:anywhere;margin:22px 0 0}.sources{border-top:1px solid var(--line);padding-top:24px;margin-bottom:40px}.sources h2{font-size:24px}.sources ul{padding-inline-start:20px;font-size:14px}.sources a{color:var(--teal);overflow-wrap:anywhere}.related{padding-block:36px 70px;border-top:1px solid var(--line)}.related-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:30px;max-width:850px;margin-top:32px}.related .card-art{aspect-ratio:1.65}.related h3{font-size:28px}.reading-progress{position:fixed;top:87px;inset-inline:0;z-index:25;height:2px;background:transparent}.reading-progress span{display:block;height:100%;background:var(--teal);width:0}.policy{max-width:790px;padding-block:70px 90px}.policy h1{font-size:clamp(42px,5vw,66px);margin-block:24px 48px}.policy section{margin-top:32px}.policy h2{font-size:27px;margin-bottom:14px}.policy p{font-size:17px;line-height:1.85}.policy>.text-link:last-child{margin-top:40px}.contact-page{padding-block:100px 130px;max-width:900px;min-height:65vh}.contact-page>p:not(.eyebrow){font-size:19px;max-width:650px;margin-top:26px}.solid-link{display:inline-flex;align-items:center;gap:20px;background:var(--teal);color:white;padding:13px 22px;border-radius:5px;text-decoration:none;font-size:14px;margin-top:30px}.solid-link:hover{background:#1c544f}.scrub-enabled .discovery{padding:0;height:var(--scroll-height)}.scrub-enabled .discovery-sticky{position:sticky;top:88px;padding-top:38px;padding-bottom:32px}.scrub-enabled .rail-viewport{overflow:hidden;scroll-snap-type:none}.scrub-enabled .rail{will-change:transform}.scrub-enabled .rail .card-art{aspect-ratio:1.45;max-height:34vh}.scrub-enabled .rail .card-read{display:none}html[dir=rtl]{--font:'Noto Sans Arabic',Arial,sans-serif;--display:'Noto Sans Arabic',Arial,sans-serif}html[dir=rtl] h1,html[dir=rtl] h2,html[dir=rtl] h3{letter-spacing:0;font-weight:500;line-height:1.45}html[dir=rtl] .hero-art{inset:0 auto 0 0;transform:scaleX(-1)}html[dir=rtl] .hero:after{background:linear-gradient(270deg,var(--paper) 0%,rgba(247,246,242,.98) 24%,rgba(247,246,242,.68) 43%,rgba(247,246,242,0) 65%)}html[dir=rtl] .hero h1{font-size:clamp(48px,5vw,76px)}html[dir=rtl] .rail-progress span{transform-origin:right}html[dir=rtl] .text-link svg,html[dir=rtl] [data-next] svg,html[dir=rtl] [data-prev] svg,html[dir=rtl] .search-form button svg,html[dir=rtl] .card-read svg{transform:scaleX(-1)}html[dir=rtl] .eyebrow,html[dir=rtl] .card-meta{letter-spacing:0}html[dir=rtl] .card-art{direction:ltr}html[dir=rtl] .article-body{line-height:2}html[dir=rtl] .hero-sub{font-size:19px}html[dir=rtl] .brand{font-family:'DM Sans',Arial,sans-serif}
@media(min-width:1600px){.rail-viewport{padding-inline:max(var(--gutter),calc((100vw - 1400px)/2))}}
@media(max-width:1100px){.header-inner{gap:20px}.main-nav{gap:18px}.header-end{gap:12px}.brand{gap:10px}.brand-word{font-size:24px}.brand-sub{font-size:10px}.hero{min-height:500px}.article-hero{gap:32px}.article-layout{grid-template-columns:190px minmax(0,1fr);gap:38px}.library-grid{gap:22px}.library-grid h3{font-size:28px}.learning-note{padding:32px}.scroll-hint{display:none}.hero-art{width:90%}}
@media(max-width:800px){.header-inner{height:74px}.brand-line{height:20px}.main-nav{display:none;position:absolute;top:74px;inset-inline:0;background:var(--paper);padding:22px var(--gutter);border-bottom:1px solid var(--line);box-shadow:0 12px 18px #17283b0d;gap:25px;flex-wrap:wrap}.main-nav.open{display:flex}.menu-toggle{display:grid;border:0;margin-inline-start:auto;order:3}.header-end{margin-inline-start:auto}.header-search{display:none}.hero{min-height:460px}.hero h1{font-size:62px}.hero-sub{max-width:360px;font-size:17px}.hero-art{width:100%;opacity:.75;object-position:65% center}.hero:after{background:linear-gradient(90deg,var(--paper),#f7f6f2e6 35%,#f7f6f200)}.hero-content{padding-block:54px}.section-heading{align-items:start}.section-heading h2{font-size:32px}.section-heading .text-link{font-size:12px;margin-top:8px}.rail .guide-card{width:clamp(280px,56vw,420px)}.rail-controls{gap:12px}.learning-note{display:block}.learning-note .text-link{margin-top:22px}.library-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.article-hero{grid-template-columns:1fr}.article-hero>img{max-height:260px;aspect-ratio:2}.article-layout{grid-template-columns:1fr;gap:32px}.toc{position:static;border-inline-end:0;border-bottom:1px solid var(--line);padding:0 0 24px}.toc ol{display:flex;gap:18px;flex-wrap:wrap;list-style:none;padding:0;margin:0 0 16px}.toc li{margin:0;padding:0;font-size:12px}.article-body{font-size:17px}.reading-progress{top:73px}.site-footer nav{gap:20px}.article-hero h1{font-size:48px}html[dir=rtl] .hero:after{background:linear-gradient(270deg,var(--paper),#f7f6f2e6 35%,#f7f6f200)}}
@media(max-width:540px){:root{--gutter:22px}.header-inner{gap:12px;height:70px}.brand-word{font-size:23px}.brand-sub{font-size:9px;letter-spacing:.09em}.brand{gap:9px}.languages{gap:6px;font-size:10px}.header-end{margin:0}.menu-toggle{width:30px;height:36px}.main-nav{top:70px}.hero{min-height:500px;align-items:flex-start}.hero-content{padding-block:46px 130px}.hero h1{font-size:52px;max-width:340px}.hero-art{opacity:1;width:100%;height:70%;top:auto;bottom:0;object-position:75% 55%}.hero:after{background:linear-gradient(180deg,var(--paper) 0%,var(--paper) 40%,#f7f6f2c9 62%,#f7f6f200 85%)}.hero-sub{font-size:16px;max-width:300px;margin-top:18px}.eyebrow{font-size:9px;margin-bottom:18px}.search-form{margin-top:24px;padding-inline-start:16px;gap:10px;background:#f7f6f2f5}.search-form input{font-size:13px}.section-heading{display:block;margin-bottom:24px}.section-heading h2{font-size:33px;max-width:330px}.section-heading p{font-size:13px}.section-heading .text-link{margin-top:18px}.discovery{padding-top:32px}.rail{gap:18px}.rail .guide-card{width:78vw}.card-art{aspect-ratio:1.15}.card-meta{font-size:9px;margin-top:16px}.guide-card h3{font-size:29px}.card-read{font-size:12px;margin-top:14px}.rail-controls{margin-top:25px}.rail-controls .icon-button{width:36px;height:36px}.rail-count{font-size:10px}.learning-note{padding:28px 24px;margin-block:20px 45px}.learning-note h2{font-size:29px}.learning-note p{font-size:14px}.site-footer{padding-top:28px;gap:22px}.site-footer nav{width:100%;gap:18px;justify-content:space-between}.site-footer nav a{font-size:10px}.library{padding-block:40px 60px}.library-heading h1{font-size:43px}.library-heading>p:not(.eyebrow){font-size:17px}.filter{padding:7px 13px;font-size:12px}.filter-row{gap:7px;margin-block:28px}.result-count{width:100%;margin-top:6px}.library-grid{grid-template-columns:1fr;gap:36px}.library-grid .card-art{aspect-ratio:1.35}.library-grid h3{font-size:30px}.article-hero{padding-block:28px 32px;gap:28px}.article-hero h1{font-size:43px}.article-deck{font-size:16px}.breadcrumb{margin-bottom:20px}.byline{font-size:10px;gap:8px}.article-layout{padding-top:30px}.article-body .lead{font-size:23px}.article-step h2{font-size:28px;gap:13px}.article-body{font-size:16px}.before-box{padding:23px}.prompt-box{padding:22px}.prompt-box>div{align-items:start}.prompt-box h2{font-size:15px}.copy-button{white-space:nowrap;font-size:10px}.prompt-box pre{font-size:13px}.related{padding-top:30px}.related-grid{grid-template-columns:1fr;gap:32px}.policy{padding-block:45px 65px}.policy h1{font-size:43px}.policy p{font-size:16px}.contact-page{padding-block:65px 90px}.contact-page h1{font-size:46px}.reading-progress{top:69px}html[dir=rtl] .hero:after{background:linear-gradient(180deg,var(--paper) 0%,var(--paper) 40%,#f7f6f2c9 62%,#f7f6f200 85%)}html[dir=rtl] .hero h1{font-size:47px}html[dir=rtl] h3{font-size:27px}html[dir=rtl] .section-heading h2{font-size:31px}html[dir=rtl] .hero-sub{font-size:16px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.rail-viewport{scroll-behavior:auto}.card-link:hover img{transform:none}}

/* Keep touch search readable without triggering automatic input zoom. */
@media(max-width:800px){.search-form input{font-size:16px}.languages a{min-width:26px;min-height:44px}.menu-toggle{min-width:44px;min-height:44px}}
@media(max-width:380px){.header-inner .brand-sub,.header-inner .brand-line{display:none}}

.worked-example{border:1px solid var(--line);padding:clamp(20px,3vw,32px);border-radius:4px;margin-bottom:40px}.worked-example h3{font:600 16px/1.6 var(--font);letter-spacing:0;margin:24px 0 10px}.worked-example .example-notice{font-size:13px;color:var(--muted)}.worked-example li{margin-block:10px}.worked-example ul{padding-inline-start:24px}.article-body>.before-box:first-child{margin:0 0 28px}.toc>.text-link{display:flex;margin-top:14px}