:root{--paper:#f8f7f2;--white:#fff;--ink:#20372e;--muted:#627169;--line:#dce2d9;--green:#294f40;--soft:#e9eee6;--warm:#efe0cf;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none;line-height:1.75}*{box-sizing:border-box}body{margin:0}a{color:var(--green);text-underline-offset:4px}a:hover{text-decoration-thickness:2px}a:focus-visible,summary:focus-visible{outline:3px solid #ad7440;outline-offset:5px}img{max-width:100%;display:block}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.3;letter-spacing:-.035em}h1{font-size:clamp(2.4rem,5vw,4.5rem);font-weight:650}h2{font-size:clamp(1.65rem,3vw,2.8rem);font-weight:600}h3{font-size:1.15rem;font-weight:600}p+p{margin-top:1rem}ul,ol{padding-left:1.4rem}li+li{margin-top:.6rem}.wrap{width:min(1140px,calc(100% - 64px));margin:auto}.skip{position:fixed;left:16px;top:-100px;background:var(--white);padding:12px;z-index:9}.skip:focus{top:12px}
.site-header{border-bottom:1px solid var(--line)}.header-inner{min-height:92px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-size:1.2rem;font-weight:650;letter-spacing:-.04em}.brand img{width:38px;height:38px}.nav{display:flex;gap:26px;align-items:center;font-size:.9rem}.nav a{color:var(--muted);text-decoration:none;white-space:nowrap}.nav a[aria-current=page]{color:var(--ink);font-weight:650}.nav a:hover{text-decoration:underline}.eyebrow{font-size:.76rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-weight:600}.status{display:inline-flex;align-items:center;gap:8px;padding:5px 11px;border:1px solid var(--line);border-radius:999px;font-size:.76rem;color:var(--muted)}.status:before{content:"";width:6px;height:6px;border-radius:50%;background:#a27c4d}
.hero{padding:84px 0 78px;display:grid;grid-template-columns:1.1fr 1fr;gap:64px;align-items:center}.hero h1{margin:24px 0}.hero .intro{font-size:1.12rem;max-width:32rem;color:var(--muted)}.actions{display:flex;flex-wrap:wrap;gap:14px;margin:30px 0 18px}.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;padding:11px 18px;min-height:46px;border-radius:10px;border:1px solid var(--line);text-decoration:none;font-size:.9rem;font-weight:550}.button.primary{color:var(--white);background:var(--green);border-color:var(--green)}.button:hover{background:var(--soft);text-decoration:none}.button.primary:hover{background:#1a3b2c}.note{font-size:.8rem;color:var(--muted)}
.diagram{margin:0;background:var(--soft);border-radius:26px;padding:30px}.diagram figcaption{font-size:.75rem;color:var(--muted);margin-bottom:20px;letter-spacing:.08em}.diagram-hub{background:var(--green);border-radius:14px;padding:20px;color:var(--white)}.diagram-hub small{display:block;color:#c2d2c6;margin-top:5px;font-size:.8rem}.diagram-hub strong{font-size:1.1rem}.diagram-track{width:2px;height:28px;background:#a5b8a7;margin:0 auto}.diagram-pair{display:grid;grid-template-columns:1fr 1fr;gap:14px}.diagram-node{border:1px solid #cad5c8;border-radius:14px;padding:16px;background:#f9faf6}.diagram-node strong{display:block;font-size:.92rem}.diagram-node small{display:block;font-size:.76rem;color:var(--muted);margin-top:7px}.mini-icon{width:30px;height:26px;border:2px solid #718c79;border-radius:5px;display:block;margin-bottom:14px;position:relative}.mini-icon:after{content:"";position:absolute;width:12px;height:2px;background:#718c79;bottom:-6px;left:7px}.mini-icon.phone{width:17px;height:28px;border-radius:5px}.mini-icon.phone:after{width:5px;left:4px;bottom:3px}.diagram-result{background:var(--warm);padding:14px 18px;border-radius:12px;font-size:.84rem;text-align:center}.diagram-footer{font-size:.73rem;color:var(--muted);text-align:center;margin-top:17px}
.principle{display:grid;grid-template-columns:1fr 2fr;gap:50px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:30px 0;align-items:center}.principle p{font-size:1.02rem;color:var(--muted)}.section{padding:78px 0}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;margin-bottom:36px}.section-heading .eyebrow{margin-bottom:12px}.section-heading p{max-width:24rem;color:var(--muted);font-size:.94rem}.feature-row{display:grid;grid-template-columns:65px 1fr 1.5fr;gap:22px;padding:27px 0;border-top:1px solid var(--line);align-items:start}.feature-row .number{font-family:ui-monospace,SFMono-Regular,monospace;color:#8d9a8e;font-size:.85rem}.feature-row p{color:var(--muted);font-size:.96rem}
.surface{background:var(--white);border:1px solid var(--line);border-radius:18px;padding:34px}.platforms{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:30px}.platforms h3{margin:16px 0 13px}.platforms p{font-size:.93rem;color:var(--muted)}.platforms .note{padding-top:15px;margin-top:19px;border-top:1px solid var(--line)}.soft-section{background:var(--soft)}.scope-list{margin-top:30px;border-top:1px solid #cbd7ca}.scope-item{display:grid;grid-template-columns:240px 1fr;gap:22px;padding:20px 0;border-bottom:1px solid #cbd7ca}.scope-item p{font-size:.93rem;color:#53665a}.next{display:flex;align-items:center;justify-content:space-between;gap:40px;padding:50px 0}.next p{margin-top:12px;color:var(--muted);max-width:40rem}.site-footer{border-top:1px solid var(--line);padding:26px 0;color:var(--muted);font-size:.78rem}.footer-inner{display:flex;align-items:flex-start;justify-content:space-between;gap:25px}.footer-links{display:flex;flex-wrap:wrap;gap:20px}.footer-links a{color:var(--muted)}
.page-head{padding:66px 0 46px;max-width:850px}.page-head h1{font-size:clamp(2.3rem,5vw,3.8rem);margin:18px 0}.page-head .lead{font-size:1.1rem;color:var(--muted);max-width:45rem}.article-grid{display:grid;grid-template-columns:210px minmax(0,1fr);gap:65px;padding-bottom:80px;align-items:start}.toc{position:sticky;top:28px;display:grid;gap:10px;font-size:.85rem}.toc a{text-decoration:none;color:var(--muted)}.article{max-width:760px}.article section+section{margin-top:42px}.article section{scroll-margin-top:28px}.article h2{font-size:1.45rem;margin-bottom:18px}.article h3{margin:24px 0 12px;font-size:1.05rem}.article p,.article li{color:#53665a}.callout{padding:22px 25px;border-left:3px solid #9aaa8c;background:var(--soft);border-radius:0 12px 12px 0;margin:24px 0}.callout.warm{background:#f2e9dd;border-left-color:#b58d5d}.callout p{font-size:.94rem}.callout strong{color:var(--ink)}
.data-table{border-collapse:collapse;width:100%;font-size:.9rem;margin-top:20px}.data-table th,.data-table td{padding:15px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.data-table th{font-size:.79rem;color:var(--muted);font-weight:550}.data-table td{color:#53665a}.data-table th:first-child,.data-table td:first-child{padding-left:0;min-width:115px;color:var(--ink)}.faq{border-top:1px solid var(--line)}details{border-bottom:1px solid var(--line);padding:19px 0}summary{font-weight:550;cursor:pointer;list-style-position:outside;margin-left:18px}details p{padding:15px 0 0;font-size:.94rem}.report{white-space:pre-wrap;overflow-wrap:anywhere;background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px;font:inherit;font-size:.88rem;color:#53665a}code{font-family:ui-monospace,SFMono-Regular,monospace;font-size:.88em;overflow-wrap:anywhere}.empty-page{max-width:700px;padding:110px 0}.empty-page p{margin:25px 0;color:var(--muted)}
@media(max-width:900px){.hero{gap:30px}.diagram{padding:22px}.article-grid{grid-template-columns:160px minmax(0,1fr);gap:30px}.scope-item{grid-template-columns:200px 1fr}.feature-row{grid-template-columns:45px 1fr 1.5fr}}@media(max-width:680px){.wrap{width:calc(100% - 36px)}.header-inner{min-height:80px;flex-wrap:wrap;padding:18px 0;gap:16px}.brand{font-size:1.1rem}.brand img{width:32px;height:32px}.nav{gap:22px;font-size:.83rem}.hero{padding:42px 0;grid-template-columns:1fr;gap:35px}.hero h1{margin:20px 0}.hero .intro{font-size:1rem}.diagram{padding:24px}.principle{grid-template-columns:1fr;gap:12px;padding:25px 0}.section{padding:48px 0}.section-heading{display:block;margin-bottom:28px}.section-heading p{margin-top:18px}.feature-row{grid-template-columns:32px 1fr;gap:12px;padding:22px 0}.feature-row p{grid-column:2}.platforms{grid-template-columns:1fr}.surface{padding:25px}.scope-item{grid-template-columns:1fr;gap:9px;padding:19px 0}.next{display:block;padding:36px 0}.next .button{margin-top:23px}.footer-inner{display:block}.footer-links{margin-top:14px}.page-head{padding:42px 0 30px}.article-grid{display:block;padding-bottom:48px}.toc{position:static;display:flex;flex-wrap:wrap;gap:10px 20px;padding-bottom:30px}.data-table th,.data-table td{padding:12px 7px}.data-table th:first-child,.data-table td:first-child{min-width:85px}.callout{padding:18px}.empty-page{padding:70px 0}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}