/* base */:root{--ink:#17344c;--blue:#24577b;--sky:#e6f0f6;--line:#bfd0dc;--paper:#fff;--muted:#4c6576}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--sky);color:var(--ink);font:17px/1.85 system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--blue);text-underline-offset:5px}a:hover{color:#0a2438}a:focus-visible{outline:3px solid #1f6caa;outline-offset:5px}p,h1,h2,h3,figure,dl{margin:0}img{display:block;max-width:100%;height:auto}h1,h2,h3{line-height:1.4;letter-spacing:-.035em}p+p{margin-top:18px}ul{padding-left:22px}li+li{margin-top:12px}/* layout */.handbook-top,.handbook-home,.handbook-footer{max-width:1160px;margin:auto;padding-left:34px;padding-right:34px}.handbook-top{display:flex;align-items:center;justify-content:space-between;padding-top:23px;padding-bottom:23px;border-bottom:1px solid var(--line)}.handbook-mark{display:flex;align-items:baseline;gap:14px;font-size:22px;font-weight:750}.handbook-mark a{text-decoration:none;color:var(--ink)}.handbook-mark>span{font-size:12px;letter-spacing:.12em;font-weight:500}.handbook-top nav{display:flex;gap:28px;font-size:14px}.handbook-top nav a{text-decoration:none}.handbook-opening{padding:46px 0 35px;max-width:860px}.handbook-opening h1{font-size:82px;line-height:1.08;font-weight:760;letter-spacing:-.06em;margin:17px 0 24px}.handbook-opening h1 span{display:block;font-size:29px;letter-spacing:.02em;margin-top:12px;font-weight:550}.handbook-intro{max-width:730px;font-size:18px}.handbook-spread{display:grid;grid-template-columns:218px minmax(0,1fr);gap:45px;align-items:start}.handbook-sheet{background:var(--paper);padding:0 43px}.handbook-chapter{padding:35px 0;scroll-margin-top:20px}.handbook-chapter+.handbook-chapter{border-top:1px solid var(--line)}.handbook-chapter h2{font-size:30px;margin:10px 0 23px}.handbook-chapter>a{display:inline-block;margin-top:22px;font-size:15px}.handbook-contents{padding-top:20px}.handbook-contents>p{font-size:13px;letter-spacing:.12em;border-bottom:1px solid var(--line);padding-bottom:12px}.handbook-contents nav{display:flex;flex-direction:column;gap:14px;margin:19px 0 28px;font-size:15px}.handbook-contents nav a{text-decoration:none}.handbook-contents figcaption{font-size:11px;color:var(--muted);margin-top:10px}.handbook-document{max-width:820px;margin:0 auto;padding:26px 35px 50px}.handbook-document-head{padding:27px 0 32px;border-bottom:1px solid var(--line);margin-bottom:28px}.handbook-document-head h1{font-size:37px;margin:14px 0 20px}.handbook-document-head>p:not(.handbook-kicker):not(.handbook-byline){font-size:19px}.handbook-footer{padding-top:38px;padding-bottom:35px;margin-top:28px;font-size:13px}.handbook-footer>p:first-child{font-size:16px}.handbook-footer nav{display:flex;gap:24px;margin:12px 0}.handbook-footer>p:last-child{color:var(--muted)}/* components */.handbook-skip{position:absolute;left:12px;top:-100px;background:white;padding:8px;z-index:10}.handbook-skip:focus{top:8px}.handbook-kicker{font-size:12px;font-weight:650;letter-spacing:.13em;color:var(--muted)}.handbook-primary{display:inline-flex;gap:30px;align-items:center;margin-top:23px;padding:11px 18px;background:var(--ink);color:white;text-decoration:none;font-size:15px}.handbook-primary:hover{color:white;background:#24577b}.handbook-roles>div{padding:16px 0;border-bottom:1px dashed var(--line)}.handbook-roles>div:first-child{padding-top:0}.handbook-roles dt{font-weight:750;margin-bottom:5px}.handbook-roles dd{margin:0;font-size:16px}.handbook-prep{margin:20px 0;font-size:16px}.handbook-margin-note{font-size:14px;border-left:3px solid var(--line);padding-left:16px;color:var(--muted)}.handbook-reading{display:block}.handbook-story{padding:21px 0;border-top:1px solid var(--line)}.handbook-story h3{font-size:24px}.handbook-story h3 a{text-decoration:none;border-bottom:1px solid var(--line)}.handbook-story p{font-size:15px;margin-top:11px}.handbook-story>span{display:block;margin-top:11px;font-size:11px;letter-spacing:.08em;color:var(--muted)}.handbook-questions h3{font-size:19px;margin:23px 0 10px}.handbook-questions p{font-size:16px}.handbook-crumb{display:flex;gap:14px;font-size:13px;color:var(--muted)}.handbook-prose h2{font-size:26px;margin:34px 0 17px}.handbook-prose p{margin:0 0 19px}.handbook-prose li{margin-bottom:10px}.handbook-answer{font-size:19px;font-weight:550;border-left:3px solid var(--blue);padding:0 0 0 21px}.handbook-byline{font-size:13px;color:var(--muted)}.handbook-source{border-top:1px solid var(--line);margin-top:38px;padding-top:8px;color:var(--muted)}.handbook-source h2{font-size:19px}.handbook-source p{font-size:14px}/* responsive */@media(max-width:720px){body{font-size:16px}.handbook-top,.handbook-home,.handbook-footer{padding-left:21px;padding-right:21px}.handbook-top{display:block;padding-top:18px;padding-bottom:18px}.handbook-mark{font-size:22px}.handbook-top nav{margin-top:13px;gap:27px;font-size:13px}.handbook-opening{padding:30px 0}.handbook-opening h1{font-size:49px;margin:15px 0 21px}.handbook-opening h1 span{font-size:25px;margin-top:14px}.handbook-intro{font-size:16px}.handbook-primary{font-size:14px;padding:11px 15px}.handbook-spread{display:flex;flex-direction:column;gap:20px}.handbook-contents{display:contents}.handbook-contents>p{display:none}.handbook-contents nav{order:0;display:flex;flex-direction:row;flex-wrap:wrap;font-size:13px;gap:10px 19px;margin:0;width:100%;padding:15px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.handbook-contents figure{order:2;max-width:220px;align-self:center}.handbook-sheet{order:1;padding:0 21px;width:100%}.handbook-chapter{padding:26px 0}.handbook-chapter h2{font-size:26px;margin:9px 0 19px}.handbook-roles dd,.handbook-prep,.handbook-questions p{font-size:15px}.handbook-story h3{font-size:22px}.handbook-story p{font-size:14px}.handbook-document{padding:20px 21px 35px}.handbook-document-head{padding:22px 0 25px}.handbook-document-head h1{font-size:29px}.handbook-document-head>p:not(.handbook-kicker):not(.handbook-byline){font-size:17px}.handbook-prose h2{font-size:23px;margin-top:29px}.handbook-answer{font-size:17px;padding-left:16px}.handbook-footer{padding-top:25px}.handbook-questions h3{font-size:18px}.handbook-source h2{font-size:18px}}