:root{color-scheme:light;--ink:#101820;--muted:#586574;--blue:#0a48c7;--soft:#edf3ff;--line:#dae1e9;--paper:#fff;--orange:#ff7a00}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}a{color:var(--blue);text-underline-offset:5px}a:hover{text-decoration-thickness:2px}a:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:5px}img{max-width:100%;height:auto}p,li,dd{line-height:1.85}p{margin:0 0 1.1em}h1,h2,h3{line-height:1.2;letter-spacing:-.035em}h1{font-size:clamp(42px,6.5vw,80px);margin:18px 0 24px;max-width:950px}h1 span{color:var(--blue)}h2{font-size:clamp(26px,3vw,38px);margin:0 0 24px}h3{font-size:22px;margin:0 0 16px}.shell{width:min(1120px,calc(100% - 64px));margin:0 auto}.skip{position:absolute;left:20px;top:-90px;background:white;padding:15px;z-index:10}.skip:focus{top:10px}.site-header{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:30px 0;border-bottom:1px solid var(--line)}.brand{color:var(--ink);font-weight:800;text-decoration:none;letter-spacing:-.03em}.brand:before{content:'↗';color:var(--blue);padding-right:10px;font-size:24px}.site-header nav{display:flex;gap:24px;flex-wrap:wrap;font-size:14px}.site-header nav a{color:var(--muted);text-decoration:none}.site-header nav a[aria-current]{color:var(--blue)}.breadcrumb{font-size:13px;color:var(--muted);margin-top:32px}.breadcrumb a{color:inherit}.hero{padding:64px 0 70px}.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:12px;font-weight:700;color:var(--blue);margin-bottom:15px}.lead{max-width:760px;font-size:clamp(18px,2vw,23px);line-height:1.7;color:var(--muted)}.byline{font-size:14px;color:var(--muted);margin-top:24px}.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:13px 21px;border:1px solid var(--line);border-radius:9px;font-size:15px;font-weight:600;text-decoration:none;line-height:1.4}.button.primary{background:var(--blue);border-color:var(--blue);color:#fff}.button:hover{box-shadow:0 3px 12px #0a48c714}.split{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:64px}.content-section{border-top:1px solid var(--line);padding:54px 0}.content-section p{max-width:780px}.aside{background:var(--soft);border-radius:18px;padding:32px;align-self:start}.aside .eyebrow{margin-bottom:24px}.fact-list{margin:0}.fact-list div+div{border-top:1px solid #d6e1f3;padding-top:18px;margin-top:18px}.fact-list dt{font-size:12px;color:var(--muted);margin-bottom:6px}.fact-list dd{margin:0;font-weight:600;overflow-wrap:anywhere}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.card{padding:30px;border:1px solid var(--line);border-radius:14px}.card p{color:var(--muted);font-size:15px}.card .number{display:block;color:var(--blue);font-size:12px;font-weight:700;margin-bottom:28px}.card a{font-weight:600;font-size:15px}.book-hero{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(220px,1fr);gap:65px;align-items:center}.book-hero h1{font-size:clamp(40px,5.8vw,70px)}.book-figure{margin:0;padding:45px 40px;background:var(--soft);border-radius:18px;text-align:center}.book-figure img{width:230px;filter:drop-shadow(10px 16px 9px #183c7229)}.book-figure figcaption{font-size:12px;color:var(--muted);margin-top:25px}.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1px;background:#d6e1f3;border:1px solid #d6e1f3;border-radius:14px;overflow:hidden;margin-top:30px}.step{background:var(--soft);padding:28px}.step strong{display:block;font-size:20px;line-height:1.5;margin-bottom:10px}.step span{color:var(--blue);font-size:13px;font-weight:700;display:block;margin-bottom:20px}.step p{font-size:14px;color:var(--muted);margin:0}.note{padding:22px 26px;border-left:3px solid var(--orange);background:#fff8f0;border-radius:0 10px 10px 0;margin:24px 0;color:#5f4b35}.faq details{border-bottom:1px solid var(--line);padding:22px 0}.faq summary{cursor:pointer;font-weight:600;font-size:18px;line-height:1.6}.faq details p{margin:16px 0 0;color:var(--muted)}.source{font-size:14px;color:var(--muted);overflow-wrap:anywhere}.related{display:flex;gap:14px 28px;flex-wrap:wrap;margin:24px 0 0}.site-footer{margin-top:40px;padding:30px 0 40px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;font-size:13px;color:var(--muted)}.site-footer a{color:inherit}
@media(max-width:760px){.shell{width:calc(100% - 40px)}.site-header{align-items:flex-start;padding:22px 0;gap:16px}.brand{font-size:14px}.site-header nav{gap:14px;font-size:12px}.breadcrumb{margin-top:26px}.hero{padding:42px 0 46px}.split,.book-hero{grid-template-columns:1fr;gap:30px}.book-hero h1{font-size:44px}.book-figure{padding:32px}.book-figure img{width:180px}.content-section{padding:36px 0}.cards,.steps{grid-template-columns:1fr}.card,.aside{padding:26px}.card .number{margin-bottom:18px}.step{padding:24px}.step span{margin-bottom:10px}.site-footer{flex-direction:column;gap:10px}.actions .button{flex:1 1 auto}.lead{font-size:18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.media-highlight{font-weight:700;color:var(--blue);line-height:1.8}.media-highlight a{display:inline-block;font-size:14px;margin-left:8px}.media-gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px;margin-top:28px}.media-gallery figure{margin:0;padding:24px;border:1px solid var(--line);border-radius:14px;text-align:center}.media-gallery img{display:block;width:auto;max-height:570px;margin:0 auto;border-radius:8px}.media-gallery figcaption{margin-top:18px;font-size:13px;line-height:1.8;color:var(--muted)}@media(max-width:760px){.media-gallery{grid-template-columns:1fr}.media-gallery figure{padding:18px}.media-highlight a{margin-left:0}}