:root{
  --brand:#334155;--brand2:#0891b2;--bg:#ffffff;--fg:#0f172a;
  --muted:#64748b;--surface:#f6f8fa;--border:#e5e9ef;--hero-ink:#ffffff;
  --maxw:1160px;--radius:16px;--shadow:0 1px 2px rgba(16,20,30,.04),0 12px 32px rgba(16,20,30,.06);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--font);color:var(--fg);background:var(--bg);line-height:1.7;font-size:17px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{opacity:.85}
h1,h2,h3{line-height:1.25;letter-spacing:-.01em;margin:0 0 .5em}
h1{font-size:clamp(2rem,5vw,3.2rem);font-weight:800}
h2{font-size:clamp(1.5rem,3vw,2.1rem);font-weight:750}
h3{font-size:1.2rem;font-weight:700}
p{margin:0 0 1em}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.section{padding:clamp(56px,8vw,104px) 0}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);background:color-mix(in srgb,var(--brand) 10%,transparent);padding:6px 12px;border-radius:999px;margin-bottom:18px}
.lead{font-size:1.15rem;color:var(--muted);max-width:60ch}
.page-meta{font-size:.85rem;color:var(--muted);margin:10px 0 0;font-variant-numeric:tabular-nums}
.hero .page-meta{color:rgba(255,255,255,.85)}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:999px;font-weight:650;background:var(--brand);color:#fff;transition:transform .15s ease,box-shadow .15s ease;box-shadow:var(--shadow)}
.btn:hover{transform:translateY(-2px);opacity:1}
.btn.ghost{background:transparent;color:var(--fg);border:1px solid var(--border);box-shadow:none}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{font-weight:800;font-size:1.15rem;color:var(--fg);display:flex;align-items:center;gap:9px}
.brand .dot{width:11px;height:11px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2))}
.brand .brand-mark{width:34px;height:34px;border-radius:9px;display:block}
.menu{display:flex;gap:26px;align-items:center;list-style:none;margin:0;padding:0}
.menu a{color:var(--fg);font-weight:550;font-size:.98rem}
.menu a:hover{color:var(--brand)}
.nav-toggle,.nav-check{display:none}
@media(max-width:860px){
  .nav-toggle{display:block;cursor:pointer;font-size:1.6rem;line-height:1;background:none;border:0;color:var(--fg)}
  .menu{position:fixed;inset:66px 0 auto 0;flex-direction:column;gap:0;background:var(--bg);border-bottom:1px solid var(--border);max-height:0;overflow:hidden;transition:max-height .3s ease}
  .menu a{padding:15px 22px;width:100%;border-top:1px solid var(--border)}
  .nav-check:checked ~ .menu{max-height:70vh}
}

/* hero */
.hero{position:relative;overflow:hidden;color:var(--hero-ink);background:linear-gradient(135deg,var(--brand),var(--brand2))}
.hero::after{content:"";position:absolute;inset:0;background:radial-gradient(1200px 500px at 80% -10%,rgba(255,255,255,.22),transparent 60%);pointer-events:none}
.hero .container{position:relative;z-index:1;padding-top:clamp(64px,10vw,120px);padding-bottom:clamp(64px,10vw,120px)}
.hero .eyebrow{color:#fff;background:rgba(255,255,255,.16)}
.hero h1{color:var(--hero-ink);max-width:16ch}
.hero .lead{color:rgba(255,255,255,.92)}
.hero .cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:28px}
.hero .btn.ghost{color:#fff;border-color:rgba(255,255,255,.5)}

/* grids */
.grid{display:grid;gap:22px}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-2{grid-template-columns:repeat(2,1fr)}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:860px){.grid.cols-3,.grid.cols-4{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.grid.cols-2,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:26px;transition:transform .18s ease,box-shadow .18s ease}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card .ico{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.4rem;background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;margin-bottom:16px}
.card h3{margin-bottom:.35em}
.card p{color:var(--muted);margin:0;font-size:.97rem}

/* stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;text-align:center}
@media(max-width:560px){.stats{grid-template-columns:1fr 1fr}}
.stat .num{font-size:clamp(2rem,4vw,2.8rem);font-weight:800;background:linear-gradient(135deg,var(--brand),var(--brand2));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .lbl{color:var(--muted);font-size:.95rem}

/* prose */
.prose{max-width:72ch}
.prose h2{margin-top:1.4em}
.prose ul{padding-left:1.2em}
.prose li{margin:.4em 0}

/* faq */
.faq details{border:1px solid var(--border);border-radius:12px;padding:2px 20px;margin-bottom:12px;background:var(--surface)}
.faq summary{cursor:pointer;font-weight:650;padding:16px 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--brand);font-weight:700}
.faq details[open] summary::after{content:"–"}
.faq details p{color:var(--muted);padding-bottom:16px;margin:0}

/* cta band */
.cta-band{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:clamp(32px,5vw,56px);text-align:center}
.cta-band h2{margin-bottom:.3em}
.cta-band .lead{margin:0 auto 24px}

/* section head */
.sec-head{max-width:64ch;margin-bottom:44px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}

/* footer */
.site-footer{background:var(--fg);color:#fff;padding:64px 0 30px;margin-top:0}
.site-footer a{color:rgba(255,255,255,.8)}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;margin-bottom:40px}
@media(max-width:720px){.footer-grid{grid-template-columns:1fr}}
.footer-grid h4{margin:0 0 14px;font-size:1rem}
.footer-grid ul{list-style:none;padding:0;margin:0}
.footer-grid li{margin:8px 0}
.footer-brand{font-weight:800;font-size:1.2rem;margin-bottom:12px}
.footer-brand .dot{display:inline-block;width:10px;height:10px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--brand2));margin-right:8px}
.footer-bottom{border-top:1px solid rgba(255,255,255,.14);padding-top:22px;color:rgba(255,255,255,.6);font-size:.88rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* hero with background image */
.hero.has-img{background:#1b1f24}
.hero .hero-bg{position:absolute;inset:0;z-index:0;width:100%;height:100%;object-fit:cover}
.hero.has-img::before{content:"";position:absolute;inset:0;z-index:0;background:linear-gradient(120deg,color-mix(in srgb,var(--brand) 82%,transparent),color-mix(in srgb,var(--brand2) 72%,transparent))}
.hero.has-img::after{background:linear-gradient(180deg,rgba(0,0,0,.15),rgba(0,0,0,.45))}

/* split: 图文左右分栏 */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,64px);align-items:center}
.split.reverse .split-media{order:2}
@media(max-width:820px){.split{grid-template-columns:1fr}.split.reverse .split-media{order:0}}
.split-media img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;aspect-ratio:4/3;object-fit:cover}
.split-body h2{margin-top:0}
.split-body ul{padding-left:1.1em;color:var(--muted)}
.split-body li{margin:.5em 0}

/* gallery: 图片网格 */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:820px){.gallery{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.gallery{grid-template-columns:1fr}}
.gallery figure{margin:0;border-radius:var(--radius);overflow:hidden;position:relative;box-shadow:var(--shadow)}
.gallery img{width:100%;aspect-ratio:1/1;object-fit:cover;transition:transform .4s ease}
.gallery figure:hover img{transform:scale(1.05)}
.gallery figcaption{position:absolute;left:0;right:0;bottom:0;padding:14px 16px;color:#fff;font-weight:600;font-size:.95rem;background:linear-gradient(0deg,rgba(0,0,0,.6),transparent)}

/* steps: 流程步骤 */
.steps{counter-reset:step;display:grid;gap:20px}
.steps.cols{grid-template-columns:repeat(2,1fr)}
@media(max-width:720px){.steps.cols{grid-template-columns:1fr}}
.step{counter-increment:step;position:relative;padding:22px 24px 22px 70px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}
.step::before{content:counter(step);position:absolute;left:22px;top:22px;width:34px;height:34px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-weight:800;color:#fff;background:linear-gradient(135deg,var(--brand),var(--brand2))}
.step h3{margin:0 0 .3em}
.step p{margin:0;color:var(--muted);font-size:.96rem}

/* card 顶部图 */
.card-img{margin:-26px -26px 18px;border-radius:var(--radius) var(--radius) 0 0;overflow:hidden}
.card-img img{width:100%;aspect-ratio:16/10;object-fit:cover}


/* 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)}