@font-face{font-family:Inter;src:url(/assets/fonts/inter.woff2) format("woff2");font-weight:400 800;font-display:swap}:root{--brand:#2f5f93;--brand-dk:#1f4f82;--brand-lt:#e8f0f9;--ink:#15202b;--text:#273340;--muted:#5b6676;--line:#e2e8f0;--soft:#f5f8fc;--bg:#fff;--up:#15803d;--up-lt:#e9f7ee;--down:#dc2626;--down-lt:#fdeeee;--amber:#b45309;--amber-lt:#fdf5e6;--radius:10px;--head:64px;--side:272px;--shadow:0 1px 2px rgba(16,24,40,.06),0 4px 14px rgba(16,24,40,.06);--font:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}*,*::before,*::after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--head) + 16px)}body{margin:0;font-family:var(--font);font-size:17px;line-height:1.65;color:var(--text);background:var(--bg)}img,svg{max-width:100%;height:auto}a{color:var(--brand);text-underline-offset:2px}a:hover{color:var(--brand-dk)}h1,h2,h3,h4{color:var(--ink);line-height:1.25;letter-spacing:-.01em}h1{font-size:clamp(1.9rem,1.4rem + 2vw,2.6rem);font-weight:800;margin:.2em 0 .35em}h2{font-size:clamp(1.4rem,1.2rem + .8vw,1.75rem);font-weight:750;margin:2.1em 0 .6em}h3{font-size:1.2rem;font-weight:700;margin:1.7em 0 .4em}p,ul,ol,dl{margin:0 0 1.05em}:focus-visible{outline:3px solid #f59e0b;outline-offset:2px;border-radius:4px}.sth-sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}.sth-skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:#fff;padding:8px 14px;border-radius:6px;z-index:100}.sth-skip:focus{left:8px}.sth-ico{width:1.1em;height:1.1em;fill:currentColor;flex:none}.sth-btn{display:inline-flex;align-items:center;gap:.5em;background:var(--brand);color:#fff;font-weight:700;font-size:1rem;line-height:1.2;padding:.8em 1.25em;border-radius:8px;border:2px solid var(--brand);text-decoration:none;cursor:pointer;font-family:inherit}.sth-btn:hover{background:var(--brand-dk);border-color:var(--brand-dk);color:#fff}.sth-btn--sm{font-size:.9rem;padding:.55em .95em}.sth-btn--lg{font-size:1.08rem;padding:.95em 1.5em}.sth-btn--ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.7)}.sth-btn--ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}.sth-link{display:inline-flex;align-items:center;gap:.4em;font-weight:700;text-decoration:none}.sth-actions{margin:1.4em 0}.sth-header{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);height:var(--head)}.sth-header__inner{display:flex;align-items:center;gap:16px;height:100%;padding:0 20px;max-width:1600px;margin:0 auto}.sth-brand{display:flex;flex:none}.sth-brand img{display:block;width:230px;height:40px}.sth-menu{display:none;align-items:center;gap:6px;background:none;border:1px solid var(--line);border-radius:8px;padding:7px 10px;font:600 .9rem var(--font);color:var(--ink);cursor:pointer}.sth-menu .sth-ico{width:20px;height:20px}.sth-search{position:relative;flex:1;max-width:520px;margin-left:auto;display:flex;align-items:center}.sth-search>.sth-ico{position:absolute;left:12px;color:var(--muted);pointer-events:none}.sth-search input{width:100%;font:inherit;font-size:.95rem;padding:.55em .9em .55em 2.4em;border:1px solid var(--line);border-radius:8px;background:var(--soft);color:var(--ink)}.sth-search input:focus{background:#fff;border-color:var(--brand);outline:none;box-shadow:0 0 0 3px var(--brand-lt)}.sth-results{position:absolute;top:calc(100% + 6px);left:0;right:0;margin:0;padding:6px;list-style:none;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 12px 32px rgba(16,24,40,.16);max-height:70vh;overflow:auto;z-index:60}.sth-results li a{display:block;padding:8px 10px;border-radius:7px;text-decoration:none;color:var(--ink)}.sth-results li a small{display:block;color:var(--muted);font-size:.8rem;line-height:1.35}.sth-results li a strong{font-weight:650;font-size:.95rem}.sth-results li[aria-selected=true] a,.sth-results li a:hover{background:var(--brand-lt)}.sth-results .sth-results__none{padding:10px;color:var(--muted);font-size:.9rem}.sth-header__cta{flex:none}.sth-shell{display:grid;grid-template-columns:var(--side) minmax(0,1fr);max-width:1600px;margin:0 auto}.sth-side{position:sticky;top:var(--head);height:calc(100vh - var(--head));border-right:1px solid var(--line);background:#fbfcfe}.sth-side__scroll{height:100%;overflow-y:auto;padding:18px 14px 40px 18px;font-size:.93rem;line-height:1.45;scrollbar-width:thin}.sth-side ul{list-style:none;margin:0;padding:0}.sth-side a{display:block;padding:5px 10px;border-radius:6px;color:var(--text);text-decoration:none}.sth-side a:hover{background:var(--brand-lt);color:var(--brand-dk)}.sth-side a[aria-current=page]{background:var(--brand);color:#fff;font-weight:600}.sth-side__top{margin-bottom:12px!important}.sth-side__top a{font-weight:600}.sth-side__h{font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:14px 10px 6px}.sth-side__sec{border-top:1px solid var(--line)}.sth-side__sec summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center;font-weight:700;color:var(--ink);padding:9px 10px;border-radius:6px}.sth-side__sec summary::-webkit-details-marker{display:none}.sth-side__sec summary::after{content:"";width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(-45deg);transition:transform .15s}.sth-side__sec[open] summary::after{transform:rotate(45deg)}.sth-side__sec summary:hover{background:var(--brand-lt)}.sth-side__sec>ul,.sth-side__sec>p,.sth-side__sec>ul+p+ul{margin-left:8px!important}.sth-side__sec[open]{padding-bottom:8px}.sth-side__g{font-size:.74rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:10px 10px 3px 18px}.sth-side__sec ul ul,.sth-side__g+ul{padding-left:8px}.sth-side__ov{font-weight:600}.sth-side__soon{font-size:.8rem;color:var(--muted);margin:6px 10px 2px 18px}.sth-side__foot{border-top:1px solid var(--line);margin-top:10px!important;padding-top:10px!important}.sth-side__foot a{color:var(--muted)}.sth-scrim{display:none}.sth-main{min-width:0;padding:28px clamp(18px,3vw,48px) 64px}.sth-crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:4px;padding:0;margin:0 0 10px;font-size:.85rem;color:var(--muted)}.sth-crumbs li:not(:last-child)::after{content:"\203A";margin-left:6px;color:#9aa4b2}.sth-crumbs a{color:var(--muted);text-decoration:none}.sth-crumbs a:hover{color:var(--brand);text-decoration:underline}.sth-eyebrow{font-size:.8rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--brand);margin:0}.sth-eyebrow--light{color:#9cc3ef}.sth-pagehead{max-width:1040px;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:26px}.sth-lead{font-size:1.15rem;color:var(--muted);max-width:72ch;margin:0 0 .8em}.sth-meta{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:.88rem;color:var(--muted);margin:0}.sth-meta span+span::before{content:"\00B7";margin-right:16px;color:#9aa4b2}.sth-chips{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0 0}.sth-chip{font-size:.8rem;font-weight:600;background:var(--brand-lt);color:var(--brand-dk);padding:3px 10px;border-radius:99px;text-decoration:none}.sth-article{display:block;max-width:1040px}.sth-prose{max-width:74ch}.sth-prose>h2:first-child,.sth-prose>.sth-key:first-child{margin-top:0}.sth-prose ul,.sth-prose ol{padding-left:1.3em}.sth-prose li{margin-bottom:.35em}.sth-toc{display:none}.sth-muted{color:var(--muted);font-size:.93rem}.sth-list li{margin-bottom:.45em}.sth-key{background:var(--soft);border:1px solid var(--line);border-left:4px solid var(--brand);border-radius:var(--radius);padding:16px 20px;margin:0 0 1.8em}.sth-key__h{font-weight:800;color:var(--ink);margin:0 0 8px;font-size:.95rem;text-transform:uppercase;letter-spacing:.05em}.sth-key ul{list-style:none;padding:0;margin:0}.sth-key li{display:flex;gap:10px;margin:0 0 6px}.sth-key .sth-ico{color:var(--up);margin-top:.3em}.sth-fig{margin:1.6em 0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}.sth-fig img{display:block;width:100%}.sth-fig figcaption{font-size:.88rem;color:var(--muted);padding:10px 14px;border-top:1px solid var(--line);background:var(--soft)}.sth-note{border-radius:var(--radius);padding:14px 18px;margin:1.5em 0;border:1px solid var(--line);background:var(--soft)}.sth-note>:last-child{margin-bottom:0}.sth-note__t{font-weight:800;color:var(--ink);margin:0 0 4px}.sth-note--tip{background:var(--up-lt);border-color:#bfe5cc}.sth-note--warn{background:var(--amber-lt);border-color:#f2d7a6}.sth-note--key{background:var(--brand-lt);border-color:#c8daef}.sth-steps{counter-reset:s;list-style:none;padding:0!important}.sth-steps li{counter-increment:s;position:relative;padding:0 0 0 46px;margin:0 0 14px}.sth-steps li::before{content:counter(s);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--brand);color:#fff;font-weight:800;display:grid;place-items:center;font-size:.9rem}.sth-mistakes{list-style:none;padding:0!important}.sth-mistakes li{border-left:3px solid var(--down);padding:2px 0 2px 14px;margin:0 0 12px}.sth-example{border:1px dashed #b9c7d8;border-radius:var(--radius);padding:14px 18px;margin:1.5em 0;background:#fcfdff}.sth-example__t{font-weight:800;color:var(--ink);margin:0 0 6px}.sth-example>:last-child{margin-bottom:0}.sth-table{overflow-x:auto;margin:1.4em 0;border:1px solid var(--line);border-radius:var(--radius)}.sth-table table{border-collapse:collapse;width:100%;font-size:.94rem}.sth-table caption{text-align:left;font-weight:700;padding:10px 14px;color:var(--ink)}.sth-table th,.sth-table td{padding:9px 14px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.sth-table th{background:var(--soft);font-weight:700;color:var(--ink)}.sth-table tr:last-child td{border-bottom:0}.sth-faq details{border:1px solid var(--line);border-radius:var(--radius);margin:0 0 10px;background:#fff}.sth-faq summary{cursor:pointer;font-weight:700;color:var(--ink);padding:13px 44px 13px 16px;position:relative;list-style:none}.sth-faq summary::-webkit-details-marker{display:none}.sth-faq summary::after{content:"+";position:absolute;right:16px;top:9px;font-size:1.4rem;font-weight:400;color:var(--brand)}.sth-faq details[open] summary::after{content:"\2212"}.sth-faq details>div{padding:0 16px 4px}.sth-sources ul{font-size:.93rem}.sth-disclaimer{font-size:.84rem;color:var(--muted);border-top:1px solid var(--line);padding-top:14px;margin-top:2.4em}.sth-pn{margin:2.4em 0 0;border:1px solid var(--line);border-radius:var(--radius);padding:14px;background:var(--soft)}.sth-pn__h{font-size:.88rem;color:var(--muted);margin:0 0 10px}.sth-pn>div{display:grid;grid-template-columns:1fr 1fr;gap:10px}.sth-pn a{display:block;background:#fff;border:1px solid var(--line);border-radius:8px;padding:10px 14px;text-decoration:none;font-weight:700;color:var(--ink);line-height:1.35}.sth-pn a:hover{border-color:var(--brand)}.sth-pn small{display:block;font-weight:600;color:var(--muted);font-size:.78rem;margin-bottom:2px}.sth-pn__next{text-align:right}.sth-cards{list-style:none;padding:0!important;margin:0 0 1.4em;display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}.sth-cards li{margin:0}.sth-cards a,.sth-cards li>div{display:flex;flex-direction:column;gap:4px;height:100%;padding:16px 18px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;text-decoration:none;color:var(--text);transition:border-color .15s,box-shadow .15s}.sth-cards a:hover{border-color:var(--brand);box-shadow:var(--shadow)}.sth-cards strong{color:var(--ink);font-size:1.03rem;line-height:1.3}.sth-cards span{font-size:.92rem;line-height:1.5}.sth-cards em{font-style:normal;font-size:.8rem;font-weight:600;color:var(--muted);margin-top:auto;padding-top:6px}.sth-cards .is-soon>div{background:var(--soft);border-style:dashed}.sth-cards .is-soon strong{color:var(--muted)}.sth-cards--courses a{border-top:4px solid var(--brand)}.sth-lessons{list-style:none;padding:0!important}.sth-lessons li{margin:0 0 10px}.sth-lessons a,.sth-lessons li>div{display:flex;align-items:center;gap:14px;padding:14px 16px;border:1px solid var(--line);border-radius:var(--radius);text-decoration:none;color:var(--text);background:#fff}.sth-lessons a:hover{border-color:var(--brand);box-shadow:var(--shadow)}.sth-lessons a>span:nth-child(2),.sth-lessons li>div>span:nth-child(2){flex:1;display:flex;flex-direction:column;gap:2px}.sth-lessons strong{color:var(--ink)}.sth-lessons span span{font-size:.92rem}.sth-lessons em{font-style:normal;font-size:.8rem;font-weight:600;color:var(--muted)}.sth-lessons .is-soon>div{background:var(--soft);border-style:dashed}.sth-num{flex:none;width:38px;height:38px;border-radius:50%;background:var(--brand-lt);color:var(--brand-dk);font-weight:800;display:grid;place-items:center;font-size:.9rem}.sth-hero{position:relative;overflow:hidden;background:#0f1722;color:#fff;isolation:isolate}.sth-hero__bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2}.sth-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(10,16,26,.94) 0%,rgba(10,16,26,.82) 45%,rgba(10,16,26,.45) 100%);z-index:-1}.sth-hero__inner{max-width:1600px;margin:0 auto;padding:clamp(48px,7vw,96px) clamp(20px,4vw,56px)}.sth-hero h1{color:#fff;max-width:20ch;font-size:clamp(2rem,1.3rem + 3vw,3.3rem)}.sth-hero__lead{font-size:1.15rem;max-width:58ch;color:#dbe5f1}.sth-hero__actions{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 0}.sth-home{max-width:1180px}.sth-sec{margin:0 0 3.2em}.sth-sec>h2:first-child{margin-top:.4em}.sth-sec__lead{color:var(--muted);max-width:75ch}.sth-goals{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:14px}.sth-goals a{display:flex;flex-direction:column;gap:6px;height:100%;padding:20px;border-radius:var(--radius);border:1px solid var(--line);background:var(--soft);text-decoration:none;color:var(--text)}.sth-goals a:hover{border-color:var(--brand)}.sth-goals strong{font-size:1.3rem;color:var(--ink)}.sth-goal__n{width:34px;height:34px;border-radius:50%;background:var(--brand);color:#fff;font-weight:800;display:grid;place-items:center}.sth-sec--panel{background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:clamp(18px,3vw,34px)}.sth-split{display:grid;grid-template-columns:1fr;gap:24px;align-items:center}.sth-split img{border:1px solid var(--line);border-radius:var(--radius);background:#fff}.sth-split h2{margin-top:0}.sth-thumbs{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}.sth-thumbs a{display:block;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;text-decoration:none;color:var(--ink);font-weight:700;background:#fff}.sth-thumbs a:hover{border-color:var(--brand);box-shadow:var(--shadow)}.sth-thumbs img{display:block;width:100%;aspect-ratio:2/1;object-fit:cover}.sth-thumbs span{display:block;padding:10px 14px}.sth-filter{display:flex;flex-direction:column;gap:6px;max-width:420px}.sth-filter label{font-weight:700;font-size:.9rem}.sth-filter input,.sth-searchpage input{font:inherit;padding:.6em .9em;border:1px solid #c5d0dd;border-radius:8px}.sth-az{display:flex;flex-wrap:wrap;gap:4px;margin:0 0 1em}.sth-az a{display:grid;place-items:center;width:34px;height:34px;border:1px solid var(--line);border-radius:6px;text-decoration:none;font-weight:700}.sth-az a:hover{background:var(--brand-lt)}.sth-gl h2{border-bottom:2px solid var(--brand-lt);padding-bottom:4px}.sth-term{padding:10px 0;border-bottom:1px solid var(--line)}.sth-term:target{background:#fff8e6;box-shadow:-10px 0 0 #fff8e6,10px 0 0 #fff8e6}.sth-term dt{font-weight:800;color:var(--ink)}.sth-term dd{margin:2px 0 0}.sth-more{font-weight:600;font-size:.9rem;white-space:nowrap}.sth-searchpage__form{display:flex;gap:10px;max-width:640px}.sth-searchpage__form input{flex:1}.sth-searchpage__results{padding-left:1.2em}.sth-searchpage__results li{margin:0 0 14px}.sth-searchpage__results small{display:block;color:var(--muted)}.sth-formcard{border:1px solid var(--line);border-radius:14px;padding:clamp(16px,3vw,28px);background:var(--soft);max-width:720px}.sth-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:4px 16px}.sth-field{display:flex;flex-direction:column;gap:5px;margin:0 0 12px}.sth-field--wide{grid-column:1/-1}.sth-field label{font-weight:700;font-size:.92rem;color:var(--ink)}.sth-optional{font-weight:400;color:var(--muted)}.sth-field-ctl{font:inherit;font-size:1rem;padding:.6em .8em;border:1px solid #c5d0dd;border-radius:8px;background:#fff;color:var(--ink);width:100%}.sth-field-ctl:focus{border-color:var(--brand);outline:none;box-shadow:0 0 0 3px var(--brand-lt)}.sth-field-ctl[aria-invalid=true]{border-color:var(--down);box-shadow:0 0 0 3px var(--down-lt)}.sth-hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}.sth-form-status{font-weight:700;margin:4px 0 10px;min-height:1.2em}.sth-form-status--ok{color:var(--up)}.sth-form-status--err{color:var(--down)}.sth-form-note{font-size:.85rem;color:var(--muted);margin:10px 0 0}.sth-footer{background:#0f1722;color:#c9d3df;font-size:.93rem}.sth-footer a{color:#e3eaf3;text-decoration:none}.sth-footer a:hover{text-decoration:underline;color:#fff}.sth-footer__grid{max-width:1600px;margin:0 auto;padding:44px clamp(20px,4vw,56px) 20px;display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:26px}.sth-footer h2{color:#fff;font-size:.82rem;text-transform:uppercase;letter-spacing:.08em;margin:0 0 10px}.sth-footer ul{list-style:none;padding:0;margin:0}.sth-footer li{margin:0 0 6px}.sth-footer__name{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;font-size:1.05rem}.sth-footer__name img{border-radius:6px}.sth-footer__legal a{text-decoration:underline}.sth-footer__legal{max-width:1600px;margin:0 auto;padding:18px clamp(20px,4vw,56px) 34px;border-top:1px solid #243244;font-size:.82rem;color:#9fb0c3}@media (min-width:1280px){.sth-article.has-toc{display:grid;grid-template-columns:minmax(0,74ch) 220px;gap:48px;max-width:none}.sth-toc{display:block;position:sticky;top:calc(var(--head) + 24px);align-self:start;font-size:.86rem;border-left:2px solid var(--line);padding-left:14px}.sth-toc__h{font-weight:800;color:var(--ink);text-transform:uppercase;letter-spacing:.06em;font-size:.74rem;margin:0 0 8px}.sth-toc ol{list-style:none;padding:0;margin:0}.sth-toc li{margin:0 0 6px}.sth-toc a{color:var(--muted);text-decoration:none}.sth-toc a:hover,.sth-toc a.is-active{color:var(--brand)}}@media (min-width:900px){.sth-split{grid-template-columns:1.05fr 1fr}}@media (max-width:1023px){.sth-shell{display:block}.sth-menu{display:inline-flex}.sth-side{position:fixed;top:var(--head);left:0;bottom:0;height:auto;width:min(320px,86vw);z-index:50;transform:translateX(-105%);transition:transform .2s ease;box-shadow:0 0 40px rgba(0,0,0,.18)}.sth-side.is-open{transform:none}.sth-scrim:not([hidden]){display:block;position:fixed;inset:var(--head) 0 0 0;background:rgba(10,16,26,.45);z-index:45}.sth-header__cta{display:none}}@media (max-width:640px){body{font-size:16.5px}.sth-header__inner{gap:10px;padding:0 12px}.sth-brand img{width:172px;height:30px}.sth-menu span{display:none}.sth-search{position:static;max-width:none}.sth-search input{padding-left:2.2em}.sth-search>.sth-ico{left:auto;margin-left:10px}.sth-results{left:8px;right:8px;top:calc(var(--head) - 4px)}.sth-form-grid{grid-template-columns:1fr}.sth-pn>div{grid-template-columns:1fr}.sth-pn__next{text-align:left}.sth-main{padding-top:20px}.sth-meta span+span::before{content:none}}@media (max-width:420px){.sth-brand img{width:150px;height:26px}}@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}@media print{.sth-header,.sth-side,.sth-footer,.sth-toc,.sth-pn{display:none!important}.sth-shell{display:block}}
