:root{
  --ink:#17191e;--paper:#f3f4f2;--surface:#ffffff;--line:#e0e0d9;--muted:#5d636c;
  --accent:#e8590c;--accent2:#e03131;
  --rail:264px;--maxw:1080px;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,"SF Mono",Menlo,Consolas,"Roboto Mono",monospace;
}
*{box-sizing:border-box}
body.skin-atlas{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:17px;line-height:1.7;-webkit-font-smoothing:antialiased}
body.skin-atlas img{max-width:100%;height:auto;display:block}
body.skin-atlas a{color:inherit;text-decoration:none}
body.skin-atlas h1,body.skin-atlas h2,body.skin-atlas h3{margin:0 0 .5em;font-weight:800;letter-spacing:-.02em;line-height:1.12}
body.skin-atlas h1{font-size:clamp(2.3rem,5.2vw,4rem)}
body.skin-atlas h2{font-size:clamp(1.5rem,3vw,2.2rem)}
body.skin-atlas h3{font-size:1.12rem;letter-spacing:-.01em}
body.skin-atlas p{margin:0 0 1em}
body.skin-atlas .container{max-width:var(--maxw);margin:0 auto;padding:0 28px}
body.skin-atlas .eyebrow{display:inline-block;font-family:var(--mono);font-size:.74rem;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:16px}
body.skin-atlas .lead{font-size:1.12rem;color:var(--muted);max-width:56ch}
body.skin-atlas .page-meta{font-family:var(--mono);font-size:.78rem;color:var(--muted);margin:12px 0 0}
body.skin-atlas .btn{display:inline-flex;align-items:center;gap:8px;padding:14px 26px;background:var(--ink);color:#fff;font-family:var(--mono);font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;border:1px solid var(--ink);transition:background .15s,color .15s}
body.skin-atlas .btn:hover{background:var(--accent);border-color:var(--accent)}
body.skin-atlas .btn.ghost{background:transparent;color:var(--ink)}
body.skin-atlas .btn.ghost:hover{background:var(--ink);color:#fff}

/* rail 侧栏（签名元素） */
body.skin-atlas .rail-check{display:none}
body.skin-atlas .rail{position:fixed;top:0;left:0;bottom:0;width:var(--rail);background:var(--surface);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:30px 26px;z-index:50}
body.skin-atlas .rail-top{display:flex;align-items:center;justify-content:space-between}
body.skin-atlas .rail-brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.15rem;letter-spacing:-.01em}
body.skin-atlas .rail-brand .mk{width:14px;height:14px;background:var(--accent);display:inline-block}
body.skin-atlas .rail-burger{display:none;font-size:1.5rem;cursor:pointer}
body.skin-atlas .rail-nav{margin-top:46px;flex:1}
body.skin-atlas .rail-nav ul{list-style:none;margin:0;padding:0;counter-reset:n}
body.skin-atlas .rail-nav li{counter-increment:n}
body.skin-atlas .rail-nav a{display:flex;align-items:baseline;gap:12px;padding:12px 0;font-size:1.05rem;font-weight:600;border-bottom:1px solid var(--line);transition:color .15s,padding .15s}
body.skin-atlas .rail-nav a::before{content:counter(n,decimal-leading-zero);font-family:var(--mono);font-size:.7rem;color:var(--muted)}
body.skin-atlas .rail-nav a:hover{color:var(--accent);padding-left:6px}
body.skin-atlas .rail-nav a[aria-current]{color:var(--accent)}
body.skin-atlas .rail-nav a[aria-current]::before{color:var(--accent)}
body.skin-atlas .rail-cta{margin-top:20px;font-family:var(--mono);font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);font-weight:600}

body.skin-atlas .atlas-main{margin-left:var(--rail);min-height:100vh}
body.skin-atlas .section{padding:clamp(56px,7vw,96px) 0;border-top:1px solid var(--line)}
body.skin-atlas .section:first-child{border-top:0}
body.skin-atlas .sec-head{max-width:64ch;margin-bottom:44px}
body.skin-atlas .sec-head.center{margin-inline:auto;text-align:center}

/* hero 左右分栏 */
body.skin-atlas .a-hero{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(32px,5vw,64px);align-items:center;padding:clamp(56px,8vw,110px) 28px;max-width:var(--maxw);margin:0 auto}
body.skin-atlas .a-hero:not(.has-img){grid-template-columns:1fr}
body.skin-atlas .a-hero h1{margin-bottom:.35em}
body.skin-atlas .a-hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px}
body.skin-atlas .a-hero-media{position:relative}
body.skin-atlas .a-hero-media::before{content:"";position:absolute;inset:16px -16px -16px 16px;border:1px solid var(--accent);z-index:0}
body.skin-atlas .a-hero-media img{position:relative;z-index:1;width:100%;aspect-ratio:4/5;object-fit:cover}

/* 卡片网格 */
body.skin-atlas .grid{display:grid;gap:0;border:1px solid var(--line);background:var(--line)}
body.skin-atlas .grid.cols-2{grid-template-columns:repeat(2,1fr)}
body.skin-atlas .grid.cols-3{grid-template-columns:repeat(3,1fr)}
body.skin-atlas .grid.cols-4{grid-template-columns:repeat(4,1fr)}
body.skin-atlas .card{background:var(--surface);padding:30px;border-left:3px solid transparent;transition:border-color .18s,transform .18s}
body.skin-atlas .card:hover{border-left-color:var(--accent)}
body.skin-atlas .card .ico{font-size:1.5rem;margin-bottom:14px}
body.skin-atlas .card h3{margin-bottom:.3em}
body.skin-atlas .card p{color:var(--muted);margin:0;font-size:.97rem}
body.skin-atlas .card-img{margin:-30px -30px 18px}
body.skin-atlas .card-img img{width:100%;aspect-ratio:16/10;object-fit:cover}
@media(max-width:820px){body.skin-atlas .grid.cols-3,body.skin-atlas .grid.cols-4{grid-template-columns:1fr 1fr}}
@media(max-width:560px){body.skin-atlas .grid{grid-template-columns:1fr!important}}

/* stats：等宽大数字 + 底部accent线 */
body.skin-atlas .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--line)}
body.skin-atlas .stat{padding:26px 20px;border-bottom:3px solid var(--accent)}
body.skin-atlas .stat .num{font-family:var(--mono);font-size:clamp(2rem,4vw,3rem);font-weight:700;letter-spacing:-.03em}
body.skin-atlas .stat .lbl{color:var(--muted);font-size:.9rem;margin-top:4px}
@media(max-width:560px){body.skin-atlas .stats{grid-template-columns:1fr 1fr}}

/* prose / split / steps / faq / gallery / cta */
body.skin-atlas .prose{max-width:72ch}
body.skin-atlas .prose h2{margin-top:1.3em}
body.skin-atlas .prose ul,body.skin-atlas .prose ol{padding-left:1.2em}
body.skin-atlas .prose li{margin:.4em 0}
body.skin-atlas .split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,60px);align-items:center}
body.skin-atlas .split.reverse .split-media{order:2}
body.skin-atlas .split-media img{width:100%;aspect-ratio:4/3;object-fit:cover;border:1px solid var(--line)}
body.skin-atlas .split-body ul{padding-left:1.1em;color:var(--muted)}
body.skin-atlas .split-body li{margin:.5em 0}
@media(max-width:820px){body.skin-atlas .split{grid-template-columns:1fr}body.skin-atlas .split.reverse .split-media{order:0}}
body.skin-atlas .steps{display:grid;gap:0;border:1px solid var(--line)}
body.skin-atlas .steps.cols{grid-template-columns:1fr 1fr}
body.skin-atlas .step{background:var(--surface);padding:24px 26px;border-top:1px solid var(--line)}
body.skin-atlas .step h3{margin:0 0 .3em}
body.skin-atlas .step p{margin:0;color:var(--muted);font-size:.96rem}
@media(max-width:720px){body.skin-atlas .steps.cols{grid-template-columns:1fr}}
body.skin-atlas .faq{max-width:760px;margin:0 auto}
body.skin-atlas .faq details{border-bottom:1px solid var(--line);padding:2px 4px}
body.skin-atlas .faq summary{cursor:pointer;font-weight:700;padding:18px 0;list-style:none}
body.skin-atlas .faq summary::-webkit-details-marker{display:none}
body.skin-atlas .faq summary::after{content:"+";float:right;color:var(--accent);font-family:var(--mono)}
body.skin-atlas .faq details[open] summary::after{content:"–"}
body.skin-atlas .faq details p{color:var(--muted);padding-bottom:18px;margin:0}
body.skin-atlas .gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
body.skin-atlas .gallery figure{margin:0;position:relative;background:var(--surface)}
body.skin-atlas .gallery img{width:100%;aspect-ratio:1/1;object-fit:cover}
body.skin-atlas .gallery figcaption{position:absolute;left:0;bottom:0;right:0;padding:12px 14px;font-family:var(--mono);font-size:.8rem;color:#fff;background:linear-gradient(0deg,rgba(0,0,0,.6),transparent)}
@media(max-width:820px){body.skin-atlas .gallery{grid-template-columns:1fr 1fr}}
@media(max-width:520px){body.skin-atlas .gallery{grid-template-columns:1fr}}
body.skin-atlas .cta-band{border:1px solid var(--ink);padding:clamp(32px,5vw,56px);text-align:center;background:var(--surface)}
body.skin-atlas .cta-band h2{margin-bottom:.3em}
body.skin-atlas .cta-band .lead{margin:0 auto 24px}

/* footer */
body.skin-atlas .a-footer{background:var(--ink);color:#fff;padding:60px 28px 28px}
body.skin-atlas .a-foot-grid{max-width:var(--maxw);margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px}
body.skin-atlas .a-footer .rail-brand{color:#fff;margin-bottom:12px}
body.skin-atlas .a-foot-grid p{color:rgba(255,255,255,.65);max-width:40ch}
body.skin-atlas .a-foot-links{display:flex;flex-direction:column;gap:10px}
body.skin-atlas .a-foot-links a{color:rgba(255,255,255,.8)}
body.skin-atlas .a-foot-links a:hover{color:var(--accent)}
body.skin-atlas .a-foot-contact{display:flex;flex-direction:column;gap:8px;color:rgba(255,255,255,.8);font-family:var(--mono);font-size:.9rem}
body.skin-atlas .a-foot-bottom{max-width:var(--maxw);margin:34px auto 0;padding-top:20px;border-top:1px solid rgba(255,255,255,.15);display:flex;justify-content:space-between;color:rgba(255,255,255,.55);font-family:var(--mono);font-size:.82rem}
@media(max-width:720px){body.skin-atlas .a-foot-grid{grid-template-columns:1fr}}

/* 移动端：rail 收成顶栏 */
@media(max-width:900px){
  body.skin-atlas .rail{position:sticky;inset:auto;width:100%;flex-direction:column;padding:16px 20px;border-right:0;border-bottom:1px solid var(--line)}
  body.skin-atlas .rail-burger{display:block}
  body.skin-atlas .rail-nav{margin-top:0;max-height:0;overflow:hidden;transition:max-height .3s ease}
  body.skin-atlas .rail-check:checked ~ .rail .rail-nav{max-height:70vh;margin-top:14px}
  body.skin-atlas .rail-cta{display:none}
  body.skin-atlas .atlas-main{margin-left:0}
  body.skin-atlas .a-hero{grid-template-columns:1fr}
  body.skin-atlas .a-hero-media::before{inset:10px -10px -10px 10px}
}


/* 滚动渐显：仅在 JS 就绪(js-reveal) + 允许动效时隐藏，无 JS 或 reduce-motion 时正常显示，防止内容看不见 */
@media (prefers-reduced-motion:no-preference){
  body.js-reveal.fx-reveal .section{opacity:0;transform:translateY(18px);transition:opacity .7s cubic-bezier(.2,.6,.2,1),transform .7s cubic-bezier(.2,.6,.2,1)}
  body.js-reveal.fx-reveal .section.in{opacity:1;transform:none}
}
/* 图片 lightbox */
body.fx-lightbox .gallery img{cursor:zoom-in}
.lb-overlay{position:fixed;inset:0;background:rgba(8,10,14,.92);display:none;align-items:center;justify-content:center;z-index:200;padding:24px;cursor:zoom-out}
.lb-overlay.open{display:flex}
.lb-overlay img{max-width:92vw;max-height:92vh;border-radius:8px;box-shadow:0 24px 70px rgba(0,0,0,.5)}