/* foundation */
:root{--ink:#272338;--muted:#655f72;--violet:#5332a3;--pale:#f1eef9;--line:#ded9e9}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:#fff;color:var(--ink);font:17px/1.8 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit;text-underline-offset:5px}a:hover{color:#6843b8}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #b58719;outline-offset:5px}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.35;letter-spacing:-.025em}h1{font-size:46px}h2{font-size:29px}h3{font-size:22px}.tb-skip{position:absolute;left:10px;top:-100px;background:white;padding:12px;z-index:4}.tb-skip:focus{top:10px}
/* stationary navigation */
.tb-rail{position:fixed;inset:0 auto 0 0;width:218px;background:var(--violet);color:white;padding:40px 26px;display:flex;flex-direction:column}.tb-logo{font-size:29px;font-weight:800;text-decoration:none;line-height:1.3}.tb-logo span{display:block;font-size:13px;font-weight:500;letter-spacing:.3em;margin-top:8px}.tb-logo:hover{color:white}.tb-rail-caption{font-size:12px;margin:30px 0 38px;color:#e0d6f5}.tb-rail nav{display:flex;flex-direction:column;gap:8px}.tb-rail nav a,.tb-rail nav span{padding:11px 10px;font-size:14px;text-decoration:none;border-radius:5px}.tb-rail nav a:hover,.tb-rail nav [aria-current]{background:#ffffff21;color:white}.tb-rail-note{font-size:11px;margin-top:auto;color:#e0d6f5}.tb-toggle{display:none}.tb-page{margin-left:218px}.tb-home{max-width:1150px;margin:auto;padding:0 58px}.tb-overline{font-size:12px;letter-spacing:.13em;color:var(--violet);font-weight:700;margin-bottom:22px}.tb-opening{padding:72px 0 52px}.tb-opening h1{font-size:64px;line-height:1.13;margin-bottom:27px}.tb-opening em{font-style:normal;color:var(--violet)}.tb-introduction{max-width:680px;font-size:19px;color:var(--muted)}.tb-choices{display:flex;gap:15px;margin-top:32px}.tb-choices a{background:var(--violet);color:white;border-radius:7px;text-decoration:none;padding:17px 24px;min-width:220px}.tb-choices a+ a{background:var(--pale);color:var(--violet)}.tb-choices b{display:block;font-size:20px}.tb-choices span{font-size:13px}.tb-contrast{border-top:1px solid var(--line);padding:44px 0;display:grid;grid-template-columns:1fr 1.2fr;gap:52px}.tb-heading p:last-child{font-size:15px;color:var(--muted)}.tb-contrast dl{margin:0}.tb-contrast dl>div{padding:0 0 19px;margin-bottom:20px;border-bottom:1px solid var(--line)}dt{font-weight:700}dd{margin:7px 0 0;color:var(--muted);font-size:16px}.tb-observation{background:var(--pale);padding:36px;border-radius:4px;margin:0 0 50px}.tb-observation-body{display:grid;grid-template-columns:1fr 1fr;gap:30px}.tb-observation-body p{font-size:16px}.tb-text-link{font-size:14px;font-weight:700}.tb-section-heading{display:flex;justify-content:space-between;gap:25px;align-items:baseline}.tb-section-heading>a{font-size:14px}.tb-reading{margin:40px 0}.tb-note{display:block;text-decoration:none;padding:26px 0;border-top:1px solid var(--line)}.tb-note h3{margin-bottom:12px}.tb-note p{color:var(--muted);font-size:16px;max-width:690px;margin-bottom:12px}.tb-note span{font-size:13px;color:var(--violet);font-weight:700}.tb-faq{padding:15px 0 55px}.tb-faq details{border-bottom:1px solid var(--line);padding:18px 0}.tb-faq summary{cursor:pointer;font-weight:600}.tb-faq details p{font-size:16px;margin:15px 0 0}.tb-footer{border-top:1px solid var(--line);padding:35px 58px 42px;font-size:13px}.tb-footer strong{font-size:17px}.tb-footer p{margin:6px 0 17px;color:var(--muted)}.tb-footer nav{display:flex;gap:24px;flex-wrap:wrap}
/* reading surfaces */
.tb-document{max-width:900px;margin:auto;padding:50px 55px 70px;min-height:70vh}.tb-breadcrumb{display:flex;gap:16px;flex-wrap:wrap;font-size:12px;margin-bottom:40px}.tb-document h1{font-size:38px}.tb-article-head{padding-bottom:20px;border-bottom:1px solid var(--line);margin-bottom:30px}.tb-article-head>p:last-child{font-size:12px;color:var(--muted);margin-bottom:0}.tb-lead{font-size:20px;line-height:1.8;color:#463565}.tb-prose h2{font-size:27px;margin-top:37px}.tb-prose p,.tb-prose li{overflow-wrap:anywhere}.tb-prose ol{padding-left:24px}.tb-prose li{margin:0 0 19px;padding-left:5px}.tb-margin-note{border-left:4px solid var(--violet);padding:20px 24px;background:var(--pale);margin:28px 0}.tb-margin-note p{font-size:16px;margin:7px 0 0}.tb-cases>div{padding:18px 0;border-bottom:1px solid var(--line)}.tb-source{font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-top:20px;margin-top:35px}
/* small screens */
@media(max-width:900px){.tb-rail{width:180px;padding:30px 20px}.tb-page{margin-left:180px}.tb-home{padding:0 30px}.tb-opening h1{font-size:51px}.tb-choices a{min-width:0;flex:1}.tb-contrast{gap:24px}.tb-document{padding:40px 30px}.tb-footer{padding:30px}}
@media(max-width:650px){body{font-size:16px}.tb-rail{position:relative;inset:auto;width:auto;padding:21px 22px;display:flex;flex-direction:row;align-items:center;justify-content:space-between;flex-wrap:wrap}.tb-logo{font-size:25px}.tb-logo span{display:inline;font-size:11px;letter-spacing:.08em;margin-left:13px}.tb-rail-caption,.tb-rail-note{display:none}.tb-toggle{display:block;color:white;border:1px solid #a998d0;background:transparent;min-height:44px;padding:8px 13px}.tb-rail nav{display:none;flex-basis:100%;margin-top:16px}.tb-rail nav[data-open]{display:flex}.tb-page{margin-left:0}.tb-home{padding:0 23px}.tb-opening{padding:36px 0}.tb-opening h1{font-size:43px}.tb-introduction{font-size:17px}.tb-overline{margin-bottom:18px}.tb-choices{display:block;margin-top:25px}.tb-choices a{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:16px 18px;margin-bottom:10px}.tb-choices b{font-size:18px}.tb-choices span{font-size:12px}.tb-contrast{display:block;padding:32px 0 16px}.tb-heading h2 br{display:none}.tb-contrast dl{margin-top:25px}.tb-contrast dl>div{margin-bottom:17px;padding-bottom:17px}.tb-observation{margin:10px 0 34px;padding:25px 23px}.tb-observation-body{display:block}.tb-observation h2{font-size:27px}.tb-reading{margin:30px 0}.tb-section-heading{display:block}.tb-section-heading h2{margin-bottom:8px}.tb-note h3{font-size:21px}.tb-note{padding:23px 0}.tb-faq{padding-bottom:35px}h2{font-size:27px}.tb-document{padding:32px 23px 45px}.tb-document h1{font-size:31px}.tb-prose h2{font-size:25px}.tb-lead{font-size:18px}.tb-margin-note{padding:19px}.tb-breadcrumb{gap:12px;margin-bottom:28px}.tb-footer{padding:28px 23px}.tb-footer nav{gap:20px}}