:root{--paper:#f6f4ed;--ink:#183b34;--muted:#64716a;--line:#d9ddd2;--accent:#cf773d;--white:#fffef9;--soft:#e5eae1}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:105px}body{margin:0;background:var(--paper);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.8}a{color:inherit;text-decoration-thickness:1px;text-underline-offset:5px}a:hover{color:#a54f23}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:5px}img{max-width:100%;height:auto;display:block}button{font:inherit}.wrap{max-width:1160px;margin:auto;padding:0 30px}.skip{position:fixed;left:20px;top:-80px;z-index:20;background:var(--ink);color:white;padding:10px 20px}.skip:focus{top:8px}.site-header{border-bottom:1px solid var(--line);background:rgba(246,244,237,.97);position:sticky;top:0;z-index:10}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:22px;min-height:88px}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;white-space:nowrap}.brand-icon{width:30px;height:30px}.brand-name{font:700 23px Georgia,"Times New Roman",serif;letter-spacing:1.3px}.brand-sub{font-size:12px;letter-spacing:2px;border-left:1px solid #aeb9ae;padding-left:12px;margin-left:2px}nav{display:flex;align-items:center;gap:25px;font-size:14px}nav a{text-decoration:none}nav a[aria-current="page"]{text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px}.nav-tool{padding:9px 15px;border:1px solid var(--ink);border-radius:3px}.eyebrow{text-transform:uppercase;font-size:12px;font-weight:700;letter-spacing:2.4px;color:var(--muted);margin:0 0 18px}.hero{display:grid;grid-template-columns:1fr 1.04fr;gap:58px;align-items:center;padding-top:70px;padding-bottom:75px}.hero h1{font-family:Georgia,"Songti SC","SimSun",serif;font-size:58px;line-height:1.28;letter-spacing:-1.5px;font-weight:500;margin:0 0 25px}.hero h1 em{font-style:normal;color:var(--accent)}.hero .intro{max-width:450px;color:#56665c;font-size:17px;line-height:1.95}.actions{display:flex;align-items:center;gap:24px;flex-wrap:wrap;margin:30px 0 22px}.button{display:inline-flex;align-items:center;justify-content:center;gap:18px;padding:13px 23px;background:var(--ink);color:var(--white);text-decoration:none;border:1px solid var(--ink);border-radius:3px;font-size:15px}.button:hover{color:white;background:#2c554a}.button.secondary{background:transparent;color:var(--ink)}.text-link{font-size:14px}.micro{font-size:12px;color:var(--muted)}.hero-art{position:relative;padding:20px 0}.art-frame{border:1px solid #a9b7ab;background:#e8e9dd;padding:18px;transform:rotate(-2deg);box-shadow:14px 18px 0 #e2e5d8}.art-frame img{width:100%}.art-bar{display:flex;justify-content:space-between;font-size:11px;font-family:Georgia,serif;letter-spacing:2px;margin-bottom:13px}.art-note{display:flex;justify-content:space-between;font-size:11px;margin-top:14px;color:#53665b}.art-tag{position:absolute;right:-12px;bottom:-1px;transform:rotate(3deg);background:var(--ink);color:#fff;padding:11px 20px;font-size:12px;letter-spacing:1px}.facts{display:flex;justify-content:space-between;gap:30px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:22px 0;font-size:13px}.facts span{color:var(--muted);margin-left:10px}.section{padding-top:65px;padding-bottom:65px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:30px;margin-bottom:30px}.section-head h2,.section-title{font:500 32px/1.5 Georgia,"Songti SC","SimSun",serif;margin:0}.section-head p{color:var(--muted);font-size:14px;margin:6px 0 0}.guide-list{border-top:1px solid var(--ink)}.guide-row{display:grid;grid-template-columns:50px 1fr 100px 35px;gap:20px;padding:26px 0;border-bottom:1px solid var(--line);align-items:center;text-decoration:none}.guide-row:hover .guide-title{color:#a54f23}.guide-number{font:italic 24px Georgia,serif;color:#9aa79c}.guide-title{font-size:20px;line-height:1.5;font-weight:600;margin:0 0 8px}.guide-summary{font-size:14px;color:var(--muted);margin:0;max-width:690px}.guide-category{font-size:12px;color:var(--muted)}.row-arrow{font-size:22px;text-align:right}.split-section{display:grid;grid-template-columns:1fr 1.3fr;gap:90px;border-top:1px solid var(--line)}.split-section h2{margin-top:0;font:500 32px/1.5 Georgia,"Songti SC","SimSun",serif}.steps{counter-reset:step;list-style:none;margin:0;padding:0}.steps li{position:relative;padding:0 0 25px 45px;counter-increment:step}.steps li:before{content:"0" counter(step);position:absolute;left:0;top:0;color:var(--accent);font:italic 22px Georgia,serif}.steps strong{font-size:17px}.steps p{font-size:14px;color:var(--muted);margin:6px 0}.scope{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.scope-grid{display:grid;grid-template-columns:1fr 1fr;gap:80px}.scope h2{font:500 28px/1.5 Georgia,"Songti SC","SimSun",serif}.scope p,.scope li{color:#526458;font-size:15px}.scope ul{padding-left:20px}.faq details{border-bottom:1px solid var(--line);padding:18px 0}.faq summary{cursor:pointer;font-weight:600}.faq details p{color:var(--muted);max-width:850px;font-size:15px}.site-footer{border-top:1px solid var(--line);padding:35px 0;font-size:12px;color:var(--muted)}.footer-top{display:flex;justify-content:space-between;gap:25px;align-items:center}.footer-links{display:flex;gap:20px;flex-wrap:wrap}.footer-note{margin:18px 0 0;font-size:11px}.breadcrumb{padding:27px 0;font-size:12px;color:var(--muted);display:flex;gap:12px;flex-wrap:wrap}.page-heading{max-width:830px;padding:25px 0 38px}.page-heading h1{font:500 42px/1.45 Georgia,"Songti SC","SimSun",serif;letter-spacing:-.8px;margin:0 0 17px}.page-heading p{color:var(--muted)}.article-layout{display:grid;grid-template-columns:minmax(0,780px) 230px;gap:65px;align-items:start;padding-bottom:70px}.article{min-width:0}.article .lead{font-size:19px;line-height:1.95;color:#345548;margin-top:0}.article p{margin:18px 0}.article h2{font-size:24px;line-height:1.6;margin:42px 0 16px}.article ol,.article ul{padding-left:24px}.article li{padding-left:5px;margin:13px 0}.article a{color:#2e7069}.article figure{margin:30px 0}.article figure img{border:1px solid #c3cbbf;background:#e9ece7}.article figcaption{font-size:12px;color:var(--muted);margin-top:12px}.article-meta{font-size:12px;display:flex;gap:18px;flex-wrap:wrap;color:var(--muted)}.article-side{position:sticky;top:115px;border-top:2px solid var(--ink);padding-top:18px;font-size:13px}.article-side h2{font-size:14px;margin:0 0 15px}.article-side a{display:block;margin:13px 0;text-decoration:none;color:#576a5e}.article-side .button{display:flex;color:white;margin-top:25px;font-size:13px}.article-side .micro{font-size:11px}.note{border-left:3px solid var(--accent);background:#eeeede;padding:20px 24px;margin:28px 0;font-size:15px}.note p{margin:8px 0 0}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:14px}th,td{text-align:left;padding:14px 12px;border-bottom:1px solid var(--line);min-width:100px}th{background:var(--soft)}.download-strip{padding:20px 24px;background:var(--soft);font-size:14px;display:flex;gap:20px;justify-content:space-between;align-items:center}.download-strip a{white-space:nowrap}.simple-content{max-width:820px;margin:0 auto;padding-bottom:70px}.simple-content h2{font-size:23px;margin-top:35px}.simple-content p,.simple-content li{line-height:2}.contact-email{font:27px Georgia,serif;overflow-wrap:anywhere}.related{border-top:1px solid var(--line);padding-top:25px;margin-top:45px}.related h2{margin:0 0 20px;font-size:20px}.related a{display:block;margin:12px 0}.illustration{max-width:660px;margin:30px auto}.not-found{padding:90px 0;max-width:650px}.not-found h1{font-size:40px}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:900px){.hero{gap:30px}.hero h1{font-size:47px}.brand-sub{display:none}.article-layout{grid-template-columns:1fr;gap:30px}.article-side{position:static;display:none}.split-section{gap:40px}.scope-grid{gap:40px}.guide-row{grid-template-columns:35px 1fr 25px}.guide-category{display:none}}
@media(max-width:640px){.wrap{padding:0 21px}.header-inner{min-height:76px;gap:12px}.brand-name{font-size:20px}.brand-icon{width:25px;height:25px}nav{gap:15px;font-size:12px}.nav-tool{padding:7px 10px}nav .nav-about{display:none}.hero{grid-template-columns:1fr;padding-top:39px;padding-bottom:48px;gap:28px}.hero h1{font-size:44px;letter-spacing:-1px}.hero .intro{font-size:15px}.hero-art{max-width:450px;padding:10px 10px 20px 0}.art-tag{right:0;bottom:0}.facts{gap:14px;font-size:12px;padding:18px 0;align-items:start}.facts span{display:block;margin:4px 0 0;font-size:11px}.section{padding-top:42px;padding-bottom:42px}.section-head{align-items:start;margin-bottom:24px}.section-head h2,.section-title{font-size:27px}.section-head .text-link{font-size:12px;white-space:nowrap;margin-top:5px}.guide-row{gap:10px;padding:23px 0}.guide-title{font-size:17px}.guide-summary{font-size:13px;line-height:1.8}.guide-number{font-size:21px}.split-section,.scope-grid{grid-template-columns:1fr;gap:20px}.split-section h2{font-size:28px}.scope-grid{gap:5px}.footer-top{display:block}.footer-links{margin-top:20px;gap:17px}.page-heading{padding:10px 0 25px}.page-heading h1{font-size:31px}.article .lead{font-size:17px}.article{font-size:15px}.article h2{font-size:22px}.article figure{margin-left:-10px;margin-right:-10px}.article figcaption{padding:0 10px}.download-strip{display:block}.download-strip a{display:block;margin-top:8px}.note{padding:16px 18px}.breadcrumb{font-size:11px;padding:22px 0}.simple-content{font-size:15px}.contact-email{font-size:23px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.comparison{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;align-items:start}.comparison-three{grid-template-columns:repeat(3,minmax(0,1fr))}.comparison figure{margin:12px 0}.comparison figcaption{overflow-wrap:anywhere}.article code{font-size:.85em;overflow-wrap:anywhere}.article caption{text-align:left;font-size:12px;padding:10px 0;color:var(--muted)}.article td a{overflow-wrap:anywhere}.preview-mat{padding:12px;border:1px solid var(--line);border-radius:3px}.mat-light{background:#fff}.mat-dark{background:#183b34;color:#fff}.article .preview-mat figure img{background:transparent;border:0}.mat-dark figcaption{color:#e2e9df}.round-preview{max-width:330px}.round-preview img{border-radius:50%}.case-entry .download-strip{margin-top:24px}.tool-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-bottom:24px}.tool-fields label{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:600}.tool-fields small{font-size:12px;font-weight:400;color:var(--muted)}.tool-fields .tool-file{grid-column:1/-1}.tool-fields .tool-check{flex-direction:row;align-items:center;gap:10px;grid-column:1/-1}input,select{max-width:100%;font:inherit;color:inherit;padding:11px 12px;border:1px solid #a9b7ab;background:#fffef9;border-radius:3px}input[type=checkbox]{width:18px;height:18px}input[type=range]{padding:10px 0;accent-color:var(--ink)}input:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:2px}fieldset{border:1px solid var(--line);padding:24px;min-width:0}legend{padding:0 10px;font-weight:600}button{cursor:pointer}button:disabled{opacity:.6;cursor:wait}input:disabled,select:disabled{opacity:.5}.tool-previews{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:30px;margin:30px 0 60px}.tool-previews h2{font-size:22px}.tool-previews p{font-size:13px;overflow-wrap:anywhere}.checker{background:conic-gradient(#e2e7df 25%,#fff 0 50%,#e2e7df 0 75%,#fff 0) 0 0/20px 20px;min-height:80px;border:1px solid var(--line)}.checker img{max-height:400px;width:100%;object-fit:contain}.tool-previews .button{margin-top:20px}#tool-status{padding:16px 20px;background:var(--soft);font-size:14px}.tool-error{border-left:4px solid #b33d21;color:#8d301b}[hidden]{display:none!important}
@media(max-width:640px){.comparison,.comparison-three,.tool-previews,.tool-fields{grid-template-columns:1fr}.tool-fields .tool-file,.tool-fields .tool-check{grid-column:auto}.comparison figure{margin:10px 0}.preview-mat figure{margin:0}.tool-previews{gap:24px}fieldset{padding:18px}.header-inner{flex-wrap:wrap;justify-content:center;padding-top:12px;padding-bottom:12px;gap:10px}nav{justify-content:center;flex-wrap:wrap;gap:14px}nav .nav-about{display:none}.article caption{font-size:11px}}