:root{--ink:#173e45;--muted:#59747a;--brand:#009bb5;--deep:#007589;--light:#edf8fa;--yellow:#f0d633;--paper:#fcfdfc;--line:#dce9eb;--body:"PingFang SC","Microsoft YaHei",sans-serif;--display:"STYuanti-SC","Yuanti SC",var(--body)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.8 var(--body);-webkit-font-smoothing:antialiased}button,input,select{font:inherit}a{color:inherit;text-decoration:none}button{color:inherit;cursor:pointer}button,a,input,select,summary{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--deep);outline-offset:4px}img,svg{max-width:100%}svg{display:block}figure,h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.45}h1,h2{font-family:var(--display);font-weight:700}h2{font-size:36px;letter-spacing:.3px}p{color:var(--muted)}.wrap{width:min(1200px,calc(100% - 80px));margin-inline:auto}.section{padding-block:88px}.site-header{position:sticky;top:0;background:#fcfdfcf5;backdrop-filter:blur(16px);border-bottom:1px solid var(--line);z-index:20}.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:88px;gap:24px}.brand{display:flex;align-items:center;gap:12px;white-space:nowrap;font-size:22px;font-weight:700;letter-spacing:1px}.brand-logo{width:46px;height:46px;object-fit:contain}.brand small{display:block;font:8px/1.6 var(--body);letter-spacing:1.45px;color:var(--muted);margin-top:4px}nav{display:flex;gap:27px;align-items:center;font-size:14px}nav>a,nav button{min-height:44px;display:flex;align-items:center}nav>a:hover,nav .active{color:var(--deep)}nav button{background:none;border:0;font-size:14px}.nav-group{position:relative}.nav-group>button{gap:8px;padding-inline:0}.dropdown{display:none;position:absolute;left:-20px;top:49px;background:white;width:164px;padding:9px;border:1px solid var(--line);border-radius:14px;box-shadow:0 16px 45px #173e4514}.nav-group.open .dropdown{display:block}.dropdown a{display:block;padding:10px 14px;border-radius:7px}.dropdown a:hover{background:var(--light)}nav .nav-contact{background:var(--ink);color:white;padding:10px 20px;border-radius:8px;gap:20px}.menu-toggle{display:none}
.hero{background:linear-gradient(105deg,#edf8fa 0%,#f8fcfc 65%,#fff 100%);overflow:hidden}.hero-inner{display:grid;grid-template-columns:1fr 1.12fr;gap:28px;align-items:center;min-height:620px;padding-block:52px}.eyebrow{display:flex;align-items:center;gap:10px;color:var(--deep);font-size:12px;letter-spacing:2px;font-weight:600;margin-bottom:23px}.eyebrow:before{content:"";width:18px;height:3px;background:var(--brand);flex-shrink:0}h1{font-size:clamp(36px,4vw,55px);letter-spacing:1px}.hero h1{line-height:1.5;white-space:nowrap}.hero-em{position:relative;color:var(--deep);display:inline-block}.hero-em svg{position:absolute;width:100%;height:12px;bottom:0;left:0;stroke:var(--yellow);stroke-width:6;fill:none}.hero-description{font-size:17px;line-height:1.95;margin-top:24px}.actions{display:flex;align-items:center;flex-wrap:wrap;gap:12px;margin-top:30px}.button{color:var(--ink);display:inline-flex;align-items:center;justify-content:center;gap:24px;min-height:48px;border:1px solid var(--line);border-radius:8px;background:white;padding:12px 22px;font-size:14px;font-weight:600;transition:background .18s,transform .18s}.button:hover{background:var(--light);transform:translateY(-2px)}.button.primary{background:var(--deep);border-color:var(--deep);color:white}.button.primary:hover{background:var(--ink)}.button.secondary{background:#ffffffa8}.hero-note{display:flex;align-items:center;gap:8px;font-size:11px;margin-top:29px;color:var(--muted)}.hero-note>span{width:6px;height:6px;background:var(--brand);border-radius:50%}.hero-art{min-width:0;position:relative}.hero-art>img{display:block;width:100%;height:auto;mix-blend-mode:multiply}.hero-art figcaption{display:flex;align-items:center;justify-content:center;gap:12px;text-align:center;font-size:11px;letter-spacing:1px;color:var(--muted);margin-top:12px}.caption-line{width:24px;height:1px;background:var(--brand)}
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footer{border-top:1px solid var(--line);background:#f3f7f7;padding-top:52px}.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:50px}.footer-brand{display:flex;align-items:center;gap:10px;font-size:20px;font-weight:700}.footer-brand img{object-fit:contain}.footer-grid>div>p{font-size:12px;margin-top:14px}.footer-grid b{font-size:12px;color:var(--muted);display:block;margin-bottom:12px;letter-spacing:1px}.footer-grid>div>a:not(.footer-brand){display:block;font-size:13px;min-height:36px}.text-button{padding:0;border:0;background:none;min-height:36px;font-size:13px;text-align:left}.footer-bottom{margin-top:40px;border-top:1px solid var(--line);padding-block:20px;display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}
.page-top{background:var(--light);border-bottom:1px solid var(--line);padding-block:25px 44px}.breadcrumb{display:flex;gap:12px;font-size:11px;color:var(--muted);margin-bottom:20px}.breadcrumb a{min-height:28px}.breadcrumb span{opacity:.5}.page-top h1{font-size:43px;margin-bottom:12px}.title-dot{color:var(--brand);margin-left:4px}.page-top p{font-size:15px}.detail-layout{display:grid;grid-template-columns:1.35fr 1fr;gap:80px;align-items:start}.detail-copy>h2{margin-bottom:23px}.detail-copy>p:not(.eyebrow){font-size:15px;margin-bottom:18px}.info-list{list-style:none;margin:30px 0;padding:0}.info-list li{padding:18px 0;border-bottom:1px solid var(--line)}.info-list b{display:block;font-size:15px;margin-bottom:5px}.info-list span{color:var(--muted);font-size:13px}.steps{counter-reset:step}.steps li{position:relative;padding-left:45px;counter-increment:step}.steps li:before{content:counter(step);position:absolute;left:0;top:22px;background:var(--light);border-radius:50%;width:28px;height:28px;display:grid;place-items:center;color:var(--deep);font-size:12px}.course-aside{border:1px solid var(--line);background:var(--light);padding:35px;border-radius:16px}.aside-symbol{width:60px;height:60px;padding:16px;background:white;color:var(--deep);border-radius:15px;margin-bottom:24px}.course-aside h3{font-size:24px;margin:14px 0}.course-aside>p:not(.tag):not(.notice){font-size:14px}.aside-contact{margin-top:28px;border-top:1px solid var(--line);padding-top:22px}.aside-contact small{font-size:11px;color:var(--muted);display:block}.aside-contact strong{font-size:28px}.notice{font-size:12px;color:var(--muted);line-height:1.9;margin-top:28px;padding-left:15px;border-left:3px solid var(--line)}.about-art{margin-top:35px}.catalog{padding-top:34px}.catalog-toolbar{padding:24px;background:white;border:1px solid var(--line);border-radius:14px}.catalog-tools{display:flex;gap:14px}.search-box{display:flex;align-items:center;gap:13px;flex:1;min-width:0;background:#f5f9fa;border:1px solid var(--line);border-radius:8px;padding:0 15px}.search-box svg{width:20px;height:20px;flex-shrink:0;color:var(--muted)}.search-box:focus-within{border-color:var(--deep);box-shadow:0 0 0 2px #009bb514}.search-box input{background:none;border:0;min-width:0;width:100%;font-size:14px;padding:13px 0;color:var(--ink);outline:none}.catalog-tools select{border:1px solid var(--line);border-radius:8px;padding:8px 14px;background:white;color:var(--ink);font-size:13px;min-height:48px}.filters{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.filter{background:none;border:0;border-radius:7px;font-size:13px;padding:9px 17px;min-height:42px;color:var(--muted)}.filter:hover{background:var(--light)}.filter.active{background:var(--ink);color:white}.catalog-summary{font-size:12px;margin:25px 0 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h2{font-family:var(--body);font-size:16px;font-weight:600;line-height:1.6;overflow-wrap:anywhere}.doc-meta{font-size:11px;margin:7px 0}.read-link{display:inline-flex;align-items:center;justify-content:space-between;gap:30px;color:var(--deep);font-size:13px;font-weight:600;min-height:44px}.read-link:hover{text-decoration:underline}.image-credit{font-size:10px;line-height:1.6;color:var(--muted);margin-top:10px}.image-credit a{white-space:nowrap;text-decoration:underline;text-underline-offset:2px}.doc-versions{font-size:11px;border-top:1px solid var(--line);margin-top:6px}.doc-versions summary{cursor:pointer;color:var(--muted);padding:12px 0;min-height:44px}.doc-versions ul{padding:0;margin:0;list-style:none}.doc-versions li{border-top:1px solid #edf2f3}.doc-versions a{padding:10px 0;display:block;color:var(--deep);overflow-wrap:anywhere}.doc-versions small{display:block;color:var(--muted);font-size:10px}.empty{grid-column:1/-1;text-align:center;background:#f3f9fa;border:1px dashed #b8d4da;border-radius:16px;padding:65px 25px}.empty h2{font-size:26px;margin-bottom:14px}.empty p{font-size:14px}.empty .eyebrow,.empty .actions{justify-content:center}.empty-icon{margin:0 auto 24px;background:white;color:var(--deep);width:65px;height:65px;padding:18px;border-radius:16px}.empty>.button{margin-top:24px}.books-empty{max-width:900px;margin:auto}.books-empty .eyebrow{font-size:10px}.empty .actions{gap:12px}
dialog{border:1px solid var(--line);border-radius:20px;padding:43px;max-width:460px;width:calc(100% - 32px);text-align:center;color:var(--ink);box-shadow:0 30px 120px #173e4533;background:var(--paper)}dialog::backdrop{background:#163e4570;backdrop-filter:blur(4px)}dialog h2{font-size:26px;margin-bottom:13px}dialog p{font-size:13px}dialog .eyebrow{justify-content:center;font-size:10px}.close-dialog{position:absolute;right:8px;top:8px;border:0;background:none;font-size:27px;width:44px;height:44px}.dialog-icon{display:grid;place-items:center;width:55px;height:55px;border-radius:15px;background:var(--light);color:var(--deep);font-size:22px;margin:0 auto 24px}.wechat-id{font-size:30px;letter-spacing:3px;background:var(--light);border:1px solid var(--line);padding:13px;border-radius:9px;margin:22px 0;user-select:all}dialog small{color:var(--muted);font-size:11px}#copy-status{min-height:24px;margin:14px 0}.skip{position:fixed;left:12px;top:-100px;background:white;padding:12px;z-index:40}.skip:focus{top:12px}
@media(min-width:1450px){.hero-inner{min-height:660px}.hero h1{font-size:58px}}
@media(max-width:1100px){.wrap{width:calc(100% - 48px)}nav{gap:19px}.brand{font-size:20px}.brand-logo{width:42px;height:42px}.hero h1{font-size:43px}.hero-inner{min-height:550px;gap:18px}.course-card{padding:28px;gap:17px}.course-card h3{font-size:21px}.resource-grid,.about-strip,.detail-layout{gap:45px}.doc-card{padding:20px;gap:18px}.product-thumb,.product-placeholder{width:105px;height:105px;flex-basis:105px}.quick-links>a{padding-inline:18px}.quick-links strong{font-size:14px}.quick-links small{font-size:11px}}
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@media(max-width:650px){.wrap{width:calc(100% - 36px)}.hero-inner{grid-template-columns:1fr;padding-top:39px;padding-bottom:24px;gap:20px;min-height:0}.hero-copy{text-align:center}.hero .eyebrow{justify-content:center;font-size:10px;margin-bottom:17px}.hero h1{font-size:39px;line-height:1.5;letter-spacing:0}.hero-description{font-size:14px;margin-top:21px;line-height:1.9}.desktop-break{display:none}.hero .actions{justify-content:center;margin-top:24px}.hero-note{justify-content:center;margin-top:21px}.hero-art{max-width:460px;width:100%;margin:auto}.hero-art figcaption{font-size:10px;margin-top:2px}.quick-links{grid-template-columns:1fr;padding-block:9px}.quick-links>a,.quick-links>a:first-child,.quick-links>a:last-child{padding:16px 0;border:0;border-bottom:1px solid var(--line);gap:15px}.quick-links>a:last-child{border:0}.quick-links .arrow{display:block}.quick-links strong{font-size:15px}.quick-links small{font-size:11px}.quick-icon{width:44px;height:44px}.section{padding-block:50px}.section-heading{margin-bottom:24px;gap:12px}.section-heading h2{font-size:26px}.section-heading>.inline-link{font-size:11px;white-space:nowrap;gap:8px}.eyebrow{font-size:10px;letter-spacing:1.5px;margin-bottom:15px}h2{font-size:29px}.course-grid,.resource-grid,.about-strip,.detail-layout{grid-template-columns:1fr;gap:20px}.course-card{display:flex;gap:18px;padding:25px}.course-symbol{width:44px;height:44px;flex-basis:44px;padding:10px}.course-card h3{font-size:21px}.course-card p{font-size:12px}.course-card .inline-link{margin-top:14px;font-size:13px}.tag{font-size:9px}.resource-grid{gap:30px}.resource-grid p{font-size:14px}.resource-preview{padding:9px 20px}.resource-preview>a{gap:17px}.resource-preview>a img{width:68px;height:68px}.resource-preview>a strong{font-size:14px}.about-strip{gap:30px}.about-strip>div>p:not(.eyebrow){font-size:14px}.contact-card{padding:27px}.contact-card h3{font-size:27px}.contact-bottom{flex-direction:row;align-items:center;gap:10px}.contact-bottom strong{font-size:26px}.contact-bottom .button{font-size:12px;padding-inline:14px;gap:10px}.footer-grid{grid-template-columns:1fr 1fr;gap:28px}footer{padding-top:36px}.footer-grid>div:first-child{grid-column:1/-1}.footer-brand{font-size:20px}.footer-bottom{font-size:10px;gap:15px;margin-top:25px}.page-top{padding-block:18px 30px}.breadcrumb{margin-bottom:12px}.page-top h1{font-size:34px}.page-top p{font-size:13px}.detail-layout{gap:34px}.detail-copy>p:not(.eyebrow){font-size:14px}.course-aside{padding:28px}.about-art{max-width:420px}.catalog{padding-top:23px}.catalog-toolbar{padding:15px}.catalog-tools{gap:8px}.catalog-tools select{font-size:11px;padding:8px;max-width:95px}.search-box{padding-inline:11px;gap:8px}.search-box input{font-size:12px}.search-box svg{width:17px}.filters{gap:4px;margin-top:12px}.filter{font-size:11px;padding:9px 9px}.catalog-summary{font-size:11px;margin:21px 0 14px}.doc-list{grid-template-columns:1fr;gap:12px}.doc-card{padding:19px;gap:18px}.product-thumb,.product-placeholder{width:96px;height:96px;flex-basis:96px}.doc-card h2{font-size:15px}.doc-category{font-size:10px}.doc-versions summary{font-size:11px}.image-credit{font-size:9px}.notice{font-size:11px;margin-top:23px}.empty{padding:43px 18px}.empty h2{font-size:24px}.empty p{font-size:13px}.empty .actions{gap:9px}.empty .button{font-size:12px;padding:11px 15px}.books-empty .eyebrow{margin-bottom:12px}dialog{padding:35px 24px}dialog h2{font-size:23px}.wechat-id{font-size:28px}}
@media(max-width:370px){.brand{font-size:17px;gap:9px}.brand small{font-size:6px}.hero h1{font-size:34px}.hero .button{font-size:12px;padding-inline:14px}.course-card{padding:22px 18px;gap:13px}.course-card h3{font-size:19px}.doc-card{gap:13px;padding:16px}.product-thumb,.product-placeholder{width:78px;height:78px;flex-basis:78px}.section-heading h2{font-size:23px}.contact-bottom{align-items:flex-start;flex-direction:column}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}.button:hover{transform:none}}