/* base */
:root{color-scheme:light;--ink:#152b37;--muted:#536671;--line:#d3dfe3;--blue:#124dd9;--pale:#ecf2f5}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:#fff;color:var(--ink);font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;font-size:17px;line-height:1.8}a{color:var(--blue);text-underline-offset:5px}a:hover{color:#082c7e}button{font:inherit}h1,h2,h3,p{margin-top:0}h1,h2,h3{line-height:1.3;letter-spacing:-.035em}h1{font-size:clamp(30px,4vw,52px)}h2{font-size:32px;margin-bottom:25px}h3{font-size:23px}p{margin-bottom:22px}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #e89510;outline-offset:5px}.nc-skip{position:absolute;top:-80px;left:20px;z-index:9;background:#fff;padding:10px}.nc-skip:focus{top:10px}
/* layout */
.nc-header{border-bottom:1px solid var(--line);background:#fff}.nc-header-inner{max-width:1240px;margin:auto;padding:24px 40px;display:flex;align-items:center;justify-content:space-between;gap:30px}.nc-opening{max-width:1240px;padding:65px 40px 55px;margin:auto}.nc-layout{max-width:1240px;margin:0 auto;display:grid;grid-template-columns:210px minmax(0,1fr);gap:65px;padding:0 40px}.nc-chapters{min-width:0}.nc-reading{max-width:880px;padding:65px 40px 95px;margin:auto;min-height:65vh}.nc-footer{max-width:1240px;margin:35px auto 0;padding:40px;display:flex;justify-content:space-between;gap:50px;border-top:2px solid var(--ink)}
/* components */
.nc-brand{color:var(--ink);font-weight:800;font-size:25px;text-decoration:none;white-space:nowrap;letter-spacing:-1px}.nc-brand small{font-size:14px;letter-spacing:0;margin-left:10px}.nc-nav{display:flex;gap:30px;font-size:14px}.nc-nav a{text-decoration:none;color:var(--ink)}.nc-menu{display:none}.nc-eyebrow{font-size:12px;letter-spacing:.12em;font-weight:700;color:var(--muted);margin-bottom:22px}.nc-opening h1{font-size:28px;font-weight:500;margin:0 0 38px}.nc-opening h1 span{display:block;font-weight:800;font-size:clamp(80px,13vw,164px);line-height:1.1;letter-spacing:-.085em;color:var(--blue);margin-bottom:16px}.nc-opening-bottom{display:flex;align-items:center;justify-content:space-between;gap:45px;border-top:1px solid var(--line);padding-top:28px}.nc-opening-bottom p{max-width:590px;margin:0;font-size:20px}.nc-button{display:inline-flex;align-items:center;justify-content:center;background:var(--blue);color:white;padding:14px 24px;min-height:48px;text-decoration:none;white-space:nowrap;font-size:15px}.nc-button:hover{background:#082c7e;color:#fff}.nc-contents{border-top:3px solid var(--blue);padding-top:24px;align-self:start;position:sticky;top:25px;font-size:14px}.nc-contents strong{display:block;margin-bottom:15px}.nc-contents a{display:block;text-decoration:none;padding:10px 0;border-bottom:1px solid var(--line);color:var(--ink)}.nc-contents p{font-size:12px;color:var(--muted);margin-top:25px}.nc-chapter{padding:40px 0 55px;border-top:1px solid var(--line)}.nc-chapter p a{display:inline-block}.nc-definitions{margin:28px 0}.nc-definitions>div{display:grid;grid-template-columns:160px 1fr;gap:22px;padding:19px 0;border-bottom:1px solid var(--line)}.nc-definitions dt{font-weight:700}.nc-definitions dd{margin:0;color:var(--muted)}.nc-tinted{background:var(--pale);padding:35px;margin:0 0 25px}.nc-sequence{border-left:2px solid var(--blue);padding-left:25px;margin:30px 0}.nc-sequence>div{margin-bottom:28px}.nc-sequence h3{font-size:19px;margin-bottom:8px}.nc-sequence p{font-size:16px;margin:0}.nc-text-link{font-weight:700}.nc-guides{display:flex;flex-direction:column}.nc-guide-link{display:block;padding:24px 0;border-top:1px solid var(--line);text-decoration:none;color:var(--ink)}.nc-guide-link span{font-size:12px;color:var(--muted)}.nc-guide-link h3{margin:8px 0}.nc-guide-link p{font-size:15px;color:var(--muted);margin:0}.nc-guide-link:hover h3{color:var(--blue)}.nc-faq details{border-bottom:1px solid var(--line);padding:19px 0}.nc-faq summary{cursor:pointer;font-weight:700}.nc-faq details p{font-size:16px;margin:16px 0 0}.nc-footer p{font-size:12px;color:var(--muted);max-width:350px;margin:10px 0 0}.nc-footer nav{display:flex;gap:25px;font-size:13px;align-items:start}.nc-breadcrumb{display:flex;gap:16px;flex-wrap:wrap;font-size:12px;margin-bottom:40px}.nc-essay{min-width:0}.nc-article-head{border-bottom:3px solid var(--blue);padding-bottom:20px;margin-bottom:35px}.nc-prose h2{font-size:27px;margin:45px 0 20px}.nc-prose p,.nc-prose li{overflow-wrap:anywhere}.nc-prose ul{padding-left:24px}.nc-prose li{margin-bottom:14px}.nc-lead{font-size:21px;line-height:1.7;font-weight:500}.nc-note{background:var(--pale);padding:24px;margin:25px 0}.nc-note p{margin:10px 0 0}
/* responsive */
@media(max-width:700px){body{font-size:16px}.nc-header-inner{padding:17px 22px;gap:12px;flex-wrap:wrap}.nc-brand{font-size:23px}.nc-brand small{font-size:12px}.nc-menu{display:block;border:1px solid var(--line);background:white;color:var(--ink);padding:7px 13px;min-height:44px}.nc-nav{display:none;flex-basis:100%;padding:12px 0 0;flex-direction:column;gap:0}.nc-nav[data-open]{display:flex}.nc-nav a,.nc-nav span{padding:9px 0}.nc-opening{padding:38px 22px}.nc-opening h1{font-size:23px;margin-bottom:26px}.nc-opening h1 span{font-size:80px;margin-bottom:15px}.nc-opening-bottom{display:block;padding-top:22px}.nc-opening-bottom p{font-size:18px;margin-bottom:22px}.nc-button{width:100%}.nc-layout{display:block;padding:0 22px}.nc-contents{position:static;margin-bottom:32px;padding-top:15px}.nc-contents a{display:inline-block;margin-right:16px;padding:9px 0}.nc-contents p{margin:12px 0 0}.nc-chapter{padding:28px 0 35px}h2{font-size:27px}.nc-definitions>div{display:block}.nc-definitions dt{margin-bottom:8px}.nc-tinted{padding:25px 20px;margin:0 -8px 28px}.nc-sequence{padding-left:17px}.nc-reading{padding:38px 23px 60px}.nc-reading h1{font-size:31px}.nc-lead{font-size:19px}.nc-prose h2{font-size:25px;margin-top:35px}.nc-note{padding:20px}.nc-footer{padding:30px 23px;display:block;margin-top:10px}.nc-footer nav{margin-top:24px;gap:20px;flex-wrap:wrap}.nc-breadcrumb{gap:12px;margin-bottom:25px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}