.ycl-main{--ycl-ink:#152c35;--ycl-mute:#5f7176;--ycl-paper:#edf1ed;--ycl-line:#bac8c5;--ycl-gold:#ac7829;--ycl-teal:#275e64;background:var(--ycl-paper);color:var(--ycl-ink);font-family:"PingFang SC","Microsoft YaHei",sans-serif;padding:36px 0 0}.ycl-main *{box-sizing:border-box}.ycl-main a{color:inherit;text-decoration:none}.ycl-main a:focus-visible,.ycl-main summary:focus-visible,.ycl-main input:focus-visible,.ss-top:focus-visible{outline:3px solid #ab7121;outline-offset:5px}.ycl-main h1,.ycl-main h2,.ycl-main h3,.ycl-main p,.ycl-main figure{margin:0}.ycl-wrap{width:min(1280px,calc(100% - 64px));margin:auto}.ycl-breadcrumb{display:flex;gap:15px;font-size:13px;color:var(--ycl-mute);margin-bottom:26px}.ycl-kicker{font-size:11px;letter-spacing:.18em;font-weight:700;color:var(--ycl-teal);line-height:1.8}.ycl-cover{display:grid;grid-template-columns:36% 64%;border-top:2px solid var(--ycl-ink);border-bottom:1px solid var(--ycl-line);padding:28px 0 32px;gap:0}.ycl-cover-copy{padding:14px 36px 10px 0}.ycl-cover h1{font-size:18px;font-weight:500;line-height:1.5;margin:30px 0 20px}.ycl-cover h1 span{display:block;margin-top:14px;font-size:clamp(40px,4.5vw,66px);font-weight:650;letter-spacing:-.045em;line-height:1.17}.ycl-intro{font-size:16px;line-height:1.9;color:#4c656a}.ycl-button{display:inline-flex;align-items:center;justify-content:space-between;gap:25px;background:var(--ycl-ink);color:#fff!important;font-size:14px;padding:16px 20px;margin-top:28px}.ycl-button:hover{background:var(--ycl-teal)}.ycl-cover-image{position:relative;padding-left:25px;border-left:1px solid var(--ycl-line)}.ycl-scene{position:relative;overflow:hidden;background:#cad6d2}.ycl-scene img{display:block;width:100%;height:auto;object-fit:cover}.ycl-scene figcaption{position:absolute;bottom:0;right:0;padding:6px 10px;background:rgba(14,33,40,.77);color:#edf4f0;font-size:10px;letter-spacing:.03em}.ycl-cover-image>.ycl-scene{height:100%;min-height:465px}.ycl-cover-image>.ycl-scene img{height:100%;object-fit:cover}.ycl-cover-caption{position:absolute;left:25px;bottom:28px;background:#17343a;color:#fff;padding:17px 23px;border-left:4px solid #d4a252;max-width:calc(100% - 35px)}.ycl-cover-caption b{display:block;font-size:18px;margin-bottom:7px}.ycl-cover-caption span{font-size:12px;color:#c7d9d7}.ycl-intro-line{display:grid;grid-template-columns:36% 64%;gap:0;padding:33px 0 48px}.ycl-intro-line b{font-size:18px;padding-right:35px;line-height:1.7}.ycl-intro-line p{padding-left:25px;max-width:780px;font-size:14px;line-height:1.9;color:var(--ycl-mute)}.ycl-book{display:grid;grid-template-columns:130px minmax(0,1fr);gap:44px}.ycl-chapter-nav{align-self:start;position:sticky;top:110px;display:grid;border-top:1px solid var(--ycl-line)}.ycl-chapter-nav a{padding:22px 0;border-bottom:1px solid var(--ycl-line);display:flex;align-items:center;gap:12px;font-size:13px}.ycl-chapter-nav b{font-size:23px;color:var(--ycl-gold);font-family:Georgia,serif;font-weight:400}.ycl-chapter-nav a:hover,.ycl-chapter-nav a[aria-current=true]{color:var(--ycl-teal);background:rgba(39,94,100,.07)}.ycl-chapter{scroll-margin-top:112px;padding:0 0 58px;margin:0 0 50px;border-bottom:1px solid var(--ycl-line)}.ycl-chapter-heading{display:flex;align-items:center;gap:22px;margin-bottom:26px}.ycl-number{font-family:Georgia,serif;font-size:52px;color:var(--ycl-gold);line-height:1}.ycl-main h2{font-size:clamp(25px,2.3vw,33px);line-height:1.4;letter-spacing:-.02em;font-weight:600}.ycl-chapter-heading .ycl-kicker{margin-bottom:5px}.ycl-section-intro{font-size:15px;line-height:1.95;color:#4b6268;max-width:780px}.ycl-observe{display:grid;grid-template-columns:repeat(3,1fr);margin-top:28px;border-top:1px solid var(--ycl-line);border-bottom:1px solid var(--ycl-line)}.ycl-observe>div{padding:24px 24px 24px 0}.ycl-observe>div+div{padding-left:24px;border-left:1px solid var(--ycl-line)}.ycl-observe b{display:block;font-size:17px;margin-bottom:12px}.ycl-observe p{font-size:14px;line-height:1.8;color:var(--ycl-mute)}.ycl-margin-note{margin-top:22px!important;line-height:1.9;font-size:13px;color:var(--ycl-mute)}.ycl-margin-note>span{color:var(--ycl-gold);margin-right:12px;font-weight:700}.ycl-feature{display:grid;grid-template-columns:55% 45%;gap:0;margin-bottom:30px}.ycl-feature>.ycl-scene img{height:100%;min-height:330px}.ycl-feature-note{padding:18px 0 18px 32px}.ycl-small-no{font-size:10px;letter-spacing:.14em;color:var(--ycl-gold)}.ycl-feature-note h3{font-size:23px;line-height:1.5;margin:16px 0}.ycl-feature-note p{font-size:14px;line-height:1.9;color:var(--ycl-mute)}.ycl-feature-note ul{padding-left:18px;line-height:1.9;font-size:13px;color:#49626a}.ycl-evidence-table{border-top:2px solid var(--ycl-teal)}.ycl-table-row{display:grid;grid-template-columns:1fr 1.3fr 1.3fr;border-bottom:1px solid var(--ycl-line)}.ycl-table-row>div,.ycl-table-row>b{padding:20px 20px 20px 0}.ycl-table-row>div+div,.ycl-table-row>b+b{padding-left:20px;border-left:1px solid var(--ycl-line)}.ycl-table-head{background:#dce6e1;font-size:13px}.ycl-table-head>b:first-child{padding-left:15px}.ycl-table-row span{font-size:15px;font-weight:700}.ycl-table-row p{font-size:13px;line-height:1.9;color:var(--ycl-mute)}.ycl-people-layout{display:grid;grid-template-columns:1fr 1fr;gap:35px}.ycl-people-layout>.ycl-scene img{height:100%;object-fit:cover}.ycl-role-list{padding:0;list-style:none;margin:20px 0 0}.ycl-role-list li{border-top:1px solid var(--ycl-line);padding:16px 0;display:grid;grid-template-columns:100px 1fr;gap:15px;font-size:13px;line-height:1.8}.ycl-role-list span{color:var(--ycl-mute)}.ycl-file-states{margin:0 0 20px}.ycl-file-states>div{display:grid;grid-template-columns:64px 1fr;gap:14px;padding:12px 0;border-bottom:1px solid var(--ycl-line);font-size:13px;line-height:1.8}.ycl-file-states dt{font-weight:700;color:var(--ycl-teal)}.ycl-file-states dd{margin:0;color:var(--ycl-mute)}.ycl-files-feature{margin-bottom:0}.ycl-preparation{scroll-margin-top:112px;display:grid;grid-template-columns:36% 64%;background:#16363d;color:#fff;margin:0 0 46px;padding:42px}.ycl-board-head{padding-right:34px}.ycl-board-head .ycl-kicker{color:#bfac80}.ycl-board-head h2{margin:15px 0 16px}.ycl-board-head p:not(.ycl-kicker){font-size:12px;line-height:1.9;color:#b8ced0;max-width:260px}.ycl-count{display:flex;align-items:baseline;gap:12px;margin-top:24px}.ycl-count strong{font-size:48px;font-family:Georgia,serif;font-weight:400;color:#e6ba6e}.ycl-count span{font-size:13px;color:#b8ced0}.ycl-checklist{display:grid;grid-template-columns:1fr 1fr;gap:0 26px}.ycl-checklist label{display:flex;align-items:flex-start;gap:13px;cursor:pointer;padding:22px 0;border-bottom:1px solid #3e5960;min-width:0}.ycl-checklist input{width:19px;height:19px;flex-shrink:0;accent-color:#d3ab63;margin:3px 0}.ycl-checklist b{display:block;font-size:15px;font-weight:500}.ycl-checklist small{display:block;font-size:12px;line-height:1.9;color:#aac5c7;margin-top:6px}.ycl-promo{margin:40px 0;overflow:hidden}.ycl-promo img{display:block;width:100%;height:auto}.ycl-help{padding:28px 0 50px;border-bottom:1px solid var(--ycl-line)}.ycl-help header .ycl-kicker,.ycl-faq header .ycl-kicker,.ycl-reading-head .ycl-kicker{margin-bottom:10px}.ycl-service-list{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;margin-top:30px}.ycl-service-list>div{display:flex;gap:20px;align-items:flex-start}.ycl-service-list span{writing-mode:vertical-rl;font-size:24px;color:var(--ycl-gold);letter-spacing:.2em}.ycl-service-list p{font-size:14px;line-height:1.9;color:var(--ycl-mute)}.ycl-boundary{font-size:12px;line-height:1.9;color:var(--ycl-mute);margin-top:28px!important;padding-top:20px;border-top:1px dashed var(--ycl-line)}.ycl-faq{display:grid;grid-template-columns:36% 64%;gap:0;padding:55px 0;border-bottom:1px solid var(--ycl-line)}.ycl-faq header{padding-right:36px}.ycl-faq details{border-bottom:1px solid var(--ycl-line)}.ycl-faq summary{cursor:pointer;font-size:16px;padding:21px 0;line-height:1.7}.ycl-faq details:first-child summary{padding-top:0}.ycl-faq details p{font-size:14px;line-height:1.9;color:var(--ycl-mute);padding-bottom:22px}.ycl-reading{padding:50px 0 40px}.ycl-reading-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:30px}.ycl-reading-head>a{font-size:13px;border-bottom:1px solid var(--ycl-teal);padding-bottom:7px}.ycl-article-list{display:grid;grid-template-columns:1fr 1fr;gap:0 38px}.ycl-article-list article{padding:25px 0;border-top:1px solid var(--ycl-line);min-width:0}.ycl-article-list h3{font-size:18px;line-height:1.65;font-weight:600}.ycl-article-list h3 a:hover{text-decoration:underline;text-underline-offset:4px}.ycl-article-list p{font-size:13px;line-height:1.9;color:var(--ycl-mute);margin:12px 0 16px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.ycl-read-link{display:inline-flex;margin-top:14px;gap:16px;font-size:12px;color:var(--ycl-teal)!important}.ycl-related{border-top:1px solid var(--ycl-line);border-bottom:1px solid var(--ycl-line);display:grid;grid-template-columns:repeat(4,1fr)}.ycl-related a{padding:22px 18px;display:flex;justify-content:space-between;font-size:13px}.ycl-related a+a{border-left:1px solid var(--ycl-line)}.ycl-related a:hover{background:#e0e8e2}.ss-skip{position:fixed;left:20px;top:-100px;background:#16363d;color:#fff;padding:13px 18px;z-index:9999}.ss-skip:focus{top:20px}.ss-top{position:fixed;right:20px;bottom:25px;z-index:100;background:#17343a;color:#fff;border:1px solid #caa665;width:42px;height:42px;cursor:pointer;opacity:0;pointer-events:none;transition:opacity .2s}.ss-top.is-visible{opacity:1;pointer-events:auto}
@media(max-width:1000px){.ycl-wrap{width:calc(100% - 40px)}.ycl-cover-copy{padding-right:22px}.ycl-cover h1 span{font-size:45px}.ycl-book{grid-template-columns:100px minmax(0,1fr);gap:25px}.ycl-chapter-nav a{gap:8px;font-size:12px}.ycl-feature,.ycl-people-layout{grid-template-columns:1fr 1fr}.ycl-feature-note{padding:0 0 0 24px}.ycl-feature-note h3{font-size:20px}.ycl-preparation{padding:30px;grid-template-columns:34% 66%}.ycl-checklist{gap:0 18px}.ycl-role-list li{display:block}.ycl-role-list b{display:block;margin-bottom:4px}.ycl-faq h2{font-size:27px}}
@media(max-width:700px){.ycl-main{padding-top:22px}.ycl-wrap{width:calc(100% - 32px)}.ycl-cover{grid-template-columns:1fr;padding-top:20px}.ycl-cover-copy{padding:0 0 28px}.ycl-cover h1{margin:19px 0 15px;font-size:16px}.ycl-cover h1 span{font-size:46px;line-height:1.17;margin-top:10px}.ycl-cover h1 span br{display:none}.ycl-intro{font-size:14px}.ycl-button{margin-top:22px}.ycl-cover-image{padding:0;border:0}.ycl-cover-image>.ycl-scene{min-height:0;height:330px}.ycl-cover-caption{left:0;bottom:26px;padding:12px 18px}.ycl-cover-caption b{font-size:16px}.ycl-intro-line{display:block;padding:25px 0 32px}.ycl-intro-line b{font-size:16px;padding:0}.ycl-intro-line p{padding:12px 0 0;font-size:13px}.ycl-book{display:block}.ycl-chapter-nav{position:static;grid-template-columns:repeat(4,minmax(0,1fr));margin-bottom:35px;border-bottom:1px solid var(--ycl-line)}.ycl-chapter-nav a{padding:13px 4px;display:block;text-align:center;border:0}.ycl-chapter-nav b{display:block;font-size:21px;margin-bottom:5px}.ycl-chapter-nav span{font-size:11px}.ycl-chapter-nav a+a{border-left:1px solid var(--ycl-line)}.ycl-chapter{padding-bottom:32px;margin-bottom:35px;scroll-margin-top:85px}.ycl-chapter-heading{gap:14px;margin-bottom:20px}.ycl-number{font-size:43px}.ycl-chapter-heading .ycl-kicker{font-size:9px;letter-spacing:.1em}.ycl-main h2{font-size:25px}.ycl-section-intro{font-size:14px}.ycl-observe{display:block;margin-top:22px}.ycl-observe>div,.ycl-observe>div+div{padding:17px 0;border-left:0;display:grid;grid-template-columns:76px 1fr;gap:12px}.ycl-observe>div+div{border-top:1px solid var(--ycl-line)}.ycl-observe b{font-size:14px;margin:0;line-height:1.8}.ycl-observe p{font-size:13px}.ycl-feature,.ycl-people-layout{display:flex;flex-direction:column;gap:24px}.ycl-feature>.ycl-scene img{min-height:0;height:auto}.ycl-feature-note{padding:0}.ycl-feature-note h3{margin:10px 0}.ycl-table-row{grid-template-columns:.82fr 1fr 1fr}.ycl-table-row>div,.ycl-table-row>b{padding:13px 8px 13px 0}.ycl-table-row>div+div,.ycl-table-row>b+b{padding-left:9px}.ycl-table-row p{font-size:11px;line-height:1.85;overflow-wrap:anywhere}.ycl-table-row span{font-size:12px}.ycl-table-head{font-size:11px}.ycl-table-head>b:first-child{padding-left:5px}.ycl-people-layout>.ycl-scene{order:-1}.ycl-role-list li{display:grid;grid-template-columns:95px 1fr}.ycl-files-feature{gap:18px}.ycl-preparation{display:block;padding:27px 22px;margin-bottom:30px;scroll-margin-top:85px}.ycl-board-head{padding:0}.ycl-board-head h2 br{display:none}.ycl-board-head p:not(.ycl-kicker){max-width:none}.ycl-count{margin-top:13px}.ycl-count strong{font-size:37px}.ycl-checklist{grid-template-columns:1fr;margin-top:10px}.ycl-checklist label{padding:17px 0}.ycl-checklist small{margin-top:3px}.ycl-promo{margin:28px 0}.ycl-help{padding:20px 0 32px}.ycl-service-list{display:block;margin-top:22px}.ycl-service-list>div{gap:20px;padding:15px 0;border-top:1px solid var(--ycl-line)}.ycl-service-list span{writing-mode:horizontal-tb;white-space:nowrap;font-size:18px;letter-spacing:.06em}.ycl-service-list p{font-size:13px}.ycl-boundary{margin-top:16px!important}.ycl-faq{display:block;padding:33px 0}.ycl-faq header{padding:0;margin-bottom:25px}.ycl-faq summary{font-size:14px}.ycl-faq details p{font-size:13px}.ycl-reading{padding:34px 0 28px}.ycl-reading-head{display:block;margin-bottom:25px}.ycl-reading-head>a{display:inline-block;margin-top:17px}.ycl-article-list{grid-template-columns:1fr}.ycl-article-list article{padding:22px 0}.ycl-article-list h3{font-size:17px}.ycl-related{grid-template-columns:1fr 1fr}.ycl-related a{padding:18px 12px;font-size:12px}.ycl-related a:nth-child(3){border-left:0}.ycl-related a:nth-child(n+3){border-top:1px solid var(--ycl-line)}.ss-top{right:14px;bottom:16px;width:38px;height:38px}}
@media(prefers-reduced-motion:reduce){.ss-top{transition:none}}