/* 介绍页样式（依赖 base.css 令牌）。动效类全部挂在 html.motion 下，手机/低性能设备默认静态。
 * 【文档】设计取舍 → website-sales/frontend-README.md「设计取舍」；总索引见 ../config.js 顶部。 */
body.intro{overflow-x:hidden}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.nav{position:sticky;top:0;z-index:30;transition:background .2s,border-color .2s;border-bottom:1px solid transparent}
.nav.solid{background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(12px);border-color:var(--line)}
.nav .wrap{display:flex;align-items:center;gap:22px;height:64px}
.nav .brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--txt)}
.nav .links{display:flex;gap:6px;margin-left:12px}
.nav .links a{padding:7px 12px;border-radius:8px;color:var(--sub);font-size:14.5px}
.nav .links a:hover{color:var(--txt);background:var(--surface2)}
.nav .sp{flex:1}
.nav .acts{display:flex;gap:8px;align-items:center}

.hero{position:relative;padding:64px 0 48px;overflow:hidden;isolation:isolate}
/* 只裁左右、不裁上下：光晕/水印可延伸到半透明导航后面，避免导航下沿出现硬接缝 */
@supports (overflow:clip){.hero{overflow:visible;overflow-x:clip}}
.hero::before{content:"";position:absolute;inset:-20% -10% auto -10%;height:90%;z-index:-1;
  background:radial-gradient(600px 360px at 16% 22%,color-mix(in srgb,var(--seal) 15%,transparent),transparent 70%),
             radial-gradient(560px 340px at 86% 12%,color-mix(in srgb,var(--brand) 20%,transparent),transparent 70%)}
/* 巨型「万」水印：宋体 + 朱红 + 微倾，像盖在纸上的大印；极淡，只做记忆点 */
.hero::after{content:"万";position:absolute;right:-1%;top:-6%;z-index:-1;pointer-events:none;line-height:1;font-weight:900;
  font-size:clamp(300px,42vw,620px);color:var(--seal);opacity:.055;transform:rotate(-8deg);
  font-family:"Songti SC","STSong","Noto Serif CJK SC","Source Han Serif SC","SimSun",serif}
.hero .wrap{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:36px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;padding:5px 12px;border-radius:999px;background:var(--brand-soft);
  color:var(--brand);font-size:13px;font-weight:600;margin-bottom:18px}
.eyebrow i{width:7px;height:7px;border-radius:50%;background:var(--seal);display:block;box-shadow:0 0 0 3px color-mix(in srgb,var(--seal) 22%,transparent)}
.hero h1{font-size:clamp(30px,4vw,48px);line-height:1.18;letter-spacing:-.02em;font-weight:800;word-break:keep-all;text-wrap:balance}
.hero h1 em{font-style:normal;background:linear-gradient(110deg,var(--seal2),var(--seal) 55%,#f08c3a);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{margin-top:18px;font-size:17px;color:var(--sub);max-width:520px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}
.hero .facts{display:flex;gap:10px 22px;flex-wrap:wrap;margin-top:28px;color:var(--sub);font-size:13.5px}
.hero .facts span::before{content:"✓";color:var(--ok);font-weight:700;margin-right:6px}
.visual{position:relative;aspect-ratio:1/.92;width:100%;max-width:520px;justify-self:end}
.visual canvas{position:absolute;inset:0;width:100%;height:100%;display:none}
html.motion .visual canvas{display:block}
/* 无动效时的静态替身：光球 + 模型标签 */
.visual .static{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:28px}
html.motion .visual .static{display:none}
html.lowperf .visual canvas{display:none!important}
html.lowperf .visual .static{display:flex!important}
.chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;max-width:420px}
.chip{padding:5px 12px;border:1px solid var(--line);border-radius:999px;background:var(--surface);font-size:13px;color:var(--sub)}
/* 静态光球 = 朱红印章（与 logo、动效中枢同款），外圈两道淡朱晕 */
.orb{position:relative;width:120px;height:120px;border-radius:36px;display:grid;place-items:center;font-size:48px;font-weight:800;color:#fff;flex:none;
  background:linear-gradient(135deg,var(--seal),var(--seal2));transform:rotate(-4deg);
  box-shadow:0 14px 34px color-mix(in srgb,var(--seal) 34%,transparent),0 0 0 14px color-mix(in srgb,var(--seal) 12%,transparent),0 0 0 34px color-mix(in srgb,var(--seal) 6%,transparent)}
.orb::after{content:"";position:absolute;inset:8px;border:2.5px solid rgba(255,255,255,.42);border-radius:28px;pointer-events:none}

section.blk{padding:84px 0}
/* 交替分段不再是一整块平色：上下两端渐隐进氛围背景，没有硬边 */
section.blk.alt{background:linear-gradient(180deg,transparent,color-mix(in srgb,var(--surface2) 78%,transparent) 14%,color-mix(in srgb,var(--surface2) 78%,transparent) 86%,transparent)}
.sec-h{text-align:center;max-width:640px;margin:0 auto 44px}
.sec-h h2{font-size:clamp(26px,3.2vw,36px);letter-spacing:-.01em;font-weight:800}
.sec-h p{color:var(--sub);margin-top:10px;font-size:16px}
.feat{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.feat .card{padding:24px;transition:transform .2s,box-shadow .2s}
.feat .ic{width:42px;height:42px;border-radius:12px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;margin-bottom:14px}
.feat h3{font-size:17px;margin-bottom:6px}.feat p{color:var(--sub);font-size:14.5px}
html.motion .feat .card:hover{transform:translateY(-4px)}

.tabs{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-bottom:26px}
.tabs button{border:1px solid var(--line);background:var(--surface);color:var(--sub);padding:8px 18px;border-radius:999px;cursor:pointer;font-size:14.5px;font-weight:500}
.tabs button.on{background:var(--brand);border-color:var(--brand);color:#fff}
.mgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:16px}
.mcard{padding:20px;display:flex;flex-direction:column;gap:8px}
.mcard .t{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.mcard .t b{font-size:16.5px}
.mcard .v{color:var(--mute);font-size:12.5px}
.mcard .d{color:var(--sub);font-size:14px;flex:1}
.mcard .pr{font-variant-numeric:tabular-nums;font-weight:600;font-size:14px;padding-top:10px;border-top:1px dashed var(--line)}
.mcard .id{font:12px var(--mono);color:var(--mute)}

.qs{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:36px;align-items:center}
.qs h2{font-size:clamp(26px,3vw,34px);font-weight:800;margin-bottom:12px}.qs p{color:var(--sub);margin-bottom:16px}
.steps3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;counter-reset:s}
.steps3 .card{position:relative;padding:26px 22px}
.steps3 .card::before{counter-increment:s;content:counter(s);display:grid;place-items:center;width:34px;height:34px;border-radius:11px;
  background:linear-gradient(135deg,var(--seal),var(--seal2));color:#fff;font-weight:800;margin-bottom:14px;transform:rotate(-5deg);
  box-shadow:0 4px 12px color-mix(in srgb,var(--seal) 32%,transparent)}
.steps3 h3{font-size:17px;margin-bottom:6px}.steps3 p{color:var(--sub);font-size:14.5px}
.cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:34px}
.faqs{max-width:760px;margin:0 auto}
.faqs details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:0 18px;margin-bottom:10px}
.faqs summary{cursor:pointer;padding:16px 0;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:12px}
.faqs summary::after{content:"+";color:var(--mute);font-size:20px;line-height:1}
.faqs details[open] summary::after{content:"–"}
.faqs summary::-webkit-details-marker{display:none}
.faqs details p{color:var(--sub);padding-bottom:16px;font-size:14.5px}
/* 结尾 CTA：深靛底 + 右上朱红光 + 巨印水印，和 hero 首尾呼应 */
.final{position:relative;overflow:hidden;isolation:isolate;text-align:center;padding:76px 24px;border-radius:24px;color:#fff;
  background:radial-gradient(520px 280px at 88% -10%,color-mix(in srgb,var(--seal) 60%,transparent),transparent 70%),
             linear-gradient(135deg,#1b2670,#2c3bbd 62%,#4a63f0)}
.final::after{content:"万";position:absolute;left:-2%;bottom:-38%;z-index:-1;pointer-events:none;line-height:1;font-weight:900;font-size:340px;
  color:#fff;opacity:.07;transform:rotate(8deg);font-family:"Songti SC","STSong","Noto Serif CJK SC","Source Han Serif SC","SimSun",serif}
.final h2{font-size:clamp(26px,3.2vw,36px);font-weight:800}.final p{opacity:.9;margin:10px 0 26px}
.final .btn{background:#fff;color:#2a3bb8;border-color:transparent;font-weight:700}
footer.foot{padding:36px 0 48px;color:var(--mute);font-size:13px;border-top:1px solid var(--line);margin-top:84px}
footer.foot .wrap{display:flex;gap:18px 32px;justify-content:space-between;flex-wrap:wrap}
footer.foot a{color:var(--sub)}

/* 下面几条原本是 index.html 里的内联 style，为通过线上 CSP（不许内联样式）挪到这里，数值未变。别再往 HTML 里写 style="…" */
.nav .icon-btn{width:36px;height:36px;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--sub);
  display:grid;place-items:center;cursor:pointer}
.qs .key-box{background:var(--surface)}
.qs p.doc-link{margin-top:14px;font-size:14px}
footer.foot #footNote{margin-top:6px}
footer.foot .foot-links{display:flex;gap:18px}
.intro .ns{text-align:center}

/* 滚动出现：仅在 JS 就绪(html.rv)后才隐藏起始态——脚本失败时内容仍然可见 */
html.motion.rv .reveal{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease}
html.motion.rv .reveal.in{opacity:1;transform:none}
html.motion.rv .reveal.d1{transition-delay:.08s}html.motion.rv .reveal.d2{transition-delay:.16s}

@media (max-width:900px){
  .nav .links{display:none}
  .hero{padding:44px 0 56px}.hero .wrap{grid-template-columns:minmax(0,1fr)}
  .visual{max-width:none;justify-self:stretch;aspect-ratio:auto}.visual .static{position:static;padding:8px 0 4px}.orb{width:96px;height:96px;font-size:38px;border-radius:30px}.orb::after{inset:7px;border-radius:23px}
  .hero::after{font-size:300px;right:-22%;top:-4%}
  section.blk{padding:56px 0}.feat,.steps3,.qs{grid-template-columns:minmax(0,1fr)}
  .wrap{padding:0 18px}
}
@media (max-width:520px){.nav .acts .btn.ghost{display:none}.hero .cta .btn{flex:1}}
.dc-note{text-align:center;margin-top:14px;font-size:13px}