/* ============================================================
   苏州悦明声科技有限公司 — 站点共享样式
   设计基调：纸感底 / 近黑文字 / 单一强调色 / 直角 / 发丝线
   所有页面共用此文件，改一处全站生效。
   ============================================================ */

/* ---------- 设计变量 ---------- */
:root{
  --paper:#f3f1ec;
  --paper-2:#eae7df;
  --ink:#111110;
  --ink-2:#4a4843;
  --muted:#706b62;
  --line:rgba(17,17,16,.15);
  --line-2:rgba(17,17,16,.07);
  --accent:#2338e8;

  --font:"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --mono:ui-monospace,"SF Mono","Cascadia Mono",Menlo,Consolas,monospace;

  --ease:cubic-bezier(.16,1,.3,1);
  --ease-2:cubic-bezier(.65,0,.35,1);

  --pad:clamp(20px,4.2vw,72px);
  --sec:clamp(88px,13vh,168px);
  --head-h:66px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:90px;scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--font);font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
  /* 用 backwards 而非 both：动画结束后不再接管 opacity，
     否则 body.leaving 的离场淡出会被动画的终值永久覆盖 */
  animation:pagein .55s var(--ease) backwards;
}
@keyframes pagein{from{opacity:0}to{opacity:1}}
h1,h2,h3,h4,p,figure{margin:0}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:var(--accent);color:#fff}

.wrap{max-width:1560px;margin:0 auto;padding:0 var(--pad)}
.sec{padding:var(--sec) 0}

/* ---------- 排版原子 ---------- */
.tag{
  font-family:var(--mono);font-size:11px;line-height:1;letter-spacing:.14em;
  text-transform:uppercase;color:var(--ink-2);
}
.tag--muted{color:var(--muted)}
.ph{color:var(--muted)}
.num{font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--muted)}

/* 区块标签：上沿发丝线随滚动横向展开 */
.shead{position:relative;display:inline-block;padding-top:14px}
.shead::before{
  content:"";position:absolute;top:0;left:0;width:100%;height:1px;background:var(--line);
  transform:scaleX(0);transform-origin:left;transition:transform 1.2s var(--ease)
}
.shead.in::before{transform:none}

/* ---------- 动效：遮罩逐行上推 ---------- */
.mask{display:block;overflow:hidden;padding-bottom:.06em}
.mask>span{display:block;transform:translateY(106%);
  transition:transform 1.05s var(--ease);transition-delay:var(--d,0s)}
.is-in .mask>span,.in .mask>span{transform:none}

/* ---------- 动效：滚动渐显 ---------- */
.rv{opacity:0;transform:translateY(22px);
  transition:opacity .9s var(--ease),transform .9s var(--ease);transition-delay:var(--d,0s)}
.rv.in{opacity:1;transform:none}

/* ---------- 媒体占位框 ---------- */
.media{
  position:relative;aspect-ratio:4/3;background:var(--paper-2);overflow:hidden;
  border:1px solid var(--line-2);
}
.media::before{
  content:"";position:absolute;inset:0;
  background:repeating-linear-gradient(135deg,transparent 0 11px,rgba(17,17,16,.05) 11px 12px);
}
.media>i{
  position:absolute;inset:0;background:var(--paper-2);transform:scaleY(1);transform-origin:bottom;
  transition:transform 1.1s var(--ease);
}
.rv.in .media>i,.media.in>i{transform:scaleY(0)}
.pin .media>i{display:none}          /* 横向滚动卡片需始终可见，直接露斜纹 */
.media figcaption{
  position:absolute;left:12px;bottom:10px;z-index:2;
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--muted);
}

/* ============================================================
   顶栏
   ============================================================ */
.head{position:fixed;inset:0 0 auto;z-index:60;background:rgba(243,241,236,.86);
  backdrop-filter:blur(10px);border-bottom:1px solid transparent;transition:border-color .3s}
.head.solid{border-bottom-color:var(--line)}
.head__in{display:flex;align-items:center;justify-content:space-between;height:var(--head-h);gap:20px}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;line-height:1.25;letter-spacing:.01em;flex:none}
.brand img{align-self:center;flex:none;width:48px;height:48px}
.brand em{font-style:normal;font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;
  color:var(--muted);text-transform:uppercase}
.head__right{display:flex;align-items:center;gap:26px}
.nav{display:flex;gap:28px}
.nav a{position:relative;font-size:14.5px;padding:4px 0;color:var(--ink-2);white-space:nowrap}
.nav a::after{content:"";position:absolute;left:0;bottom:0;width:100%;height:1px;
  background:var(--ink);transform:scaleX(0);transform-origin:right;transition:transform .45s var(--ease)}
.nav a:hover::after,.nav a.on::after{transform:scaleX(1);transform-origin:left}
.nav a.on{color:var(--ink)}
.progress{position:fixed;left:0;top:calc(var(--head-h) - 1px);height:1.5px;width:100%;background:var(--accent);
  transform:scaleX(0);transform-origin:left;z-index:61}

/* 汉堡（移动端） */
.burger{display:none;width:40px;height:40px;position:relative;flex:none;margin-right:-8px}
.burger i{position:absolute;left:9px;width:22px;height:1px;background:var(--ink);
  transition:transform .45s var(--ease),opacity .3s}
.burger i:nth-child(1){top:15px}
.burger i:nth-child(2){top:21px}
.burger i:nth-child(3){top:27px}
.burger.on i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.burger.on i:nth-child(2){opacity:0}
.burger.on i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.mnav{position:fixed;left:0;right:0;top:var(--head-h);z-index:59;background:var(--paper);
  border-bottom:1px solid var(--line);padding:6px var(--pad) 26px;display:none}
.mnav.on{display:block;animation:mnavin .4s var(--ease) both}
@keyframes mnavin{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
.mnav a{display:block;padding:15px 0;border-bottom:1px solid var(--line-2);font-size:16px;color:var(--ink-2)}
.mnav a.on{color:var(--ink)}
.mnav .btn{margin-top:20px;width:100%;justify-content:center}

/* ============================================================
   按钮
   ============================================================ */
.btn{
  display:inline-flex;align-items:center;gap:10px;padding:13px 26px;font-size:14.5px;font-weight:600;
  border:1px solid var(--ink);background:transparent;position:relative;overflow:hidden;
  isolation:isolate;                    /* 建立层叠上下文，否则 z-index:-1 的填充会被画到 body 背景之后 */
  transition:color .4s var(--ease);cursor:pointer;white-space:nowrap;
}
.btn::before{content:"";position:absolute;inset:0;background:var(--ink);transform:translateY(101%);
  transition:transform .5s var(--ease);z-index:-1}
.btn>*{position:relative;z-index:1}
.btn:hover{color:var(--paper)}
.btn:hover::before{transform:none}
.btn--line{border-color:var(--line);color:var(--ink-2)}
.btn--line:hover{color:var(--ink);border-color:var(--ink)}
.btn--line::before{display:none}
.btn--sm{padding:9px 18px;font-size:13.5px}
.btn i{width:14px;height:1px;background:currentColor;display:block;transition:width .4s var(--ease)}
.btn:hover i{width:22px}

/* ============================================================
   首屏
   ============================================================ */
.hero{position:relative;padding:clamp(140px,20vh,220px) 0 0}
.hero__grid{display:grid;grid-template-columns:1fr auto;gap:40px;align-items:end}
.display{
  font-size:clamp(40px,7.6vw,116px);line-height:1.02;font-weight:800;letter-spacing:-.015em;
}
.display .ph{color:var(--ink)}
.hero__meta{text-align:right;display:grid;gap:6px;justify-items:end;padding-bottom:12px}
.hero__sub{margin-top:34px;max-width:52ch;font-size:clamp(15px,1.15vw,17.5px);color:var(--ink-2)}
.hero__cta{display:flex;gap:14px;margin-top:38px;flex-wrap:wrap}

/* 首屏底部声波装饰 */
.wave{display:flex;justify-content:space-between;align-items:flex-end;height:44px;
  margin-top:clamp(48px,8vh,96px);border-bottom:1px solid var(--line-2)}
.wave span{width:2px;flex:none;background:var(--ink);opacity:.13;height:12%;transform-origin:bottom;
  animation:wv 3.6s var(--ease-2) infinite alternate}
@keyframes wv{to{height:100%}}

/* ============================================================
   跑马灯
   ============================================================ */
.mq{border-top:1px solid var(--line);border-bottom:1px solid var(--line);overflow:hidden;padding:18px 0}
.mq__track{display:flex;width:max-content;animation:mq 34s linear infinite}
.mq:hover .mq__track{animation-play-state:paused}
.mq__group{display:flex;flex:none}
.mq__item{display:flex;align-items:center;gap:26px;padding-right:26px;
  font-family:var(--mono);font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink-2)}
.mq__item s{width:5px;height:5px;background:var(--accent);display:block;text-decoration:none}
@keyframes mq{to{transform:translateX(-50%)}}

/* ============================================================
   01 关于
   ============================================================ */
.about{display:grid;grid-template-columns:minmax(180px,.9fr) 2.1fr;gap:clamp(24px,5vw,90px)}
.about__lead{font-size:clamp(20px,2.1vw,31px);line-height:1.5;font-weight:600;max-width:22ch}
.about__body{margin-top:28px;max-width:56ch;color:var(--ink-2);font-size:16.5px}
.about__grid{display:grid;grid-template-columns:repeat(2,1fr);gap:28px;margin-top:52px}
.about__cell{border-top:1px solid var(--line);padding-top:16px}
.about__cell h4{font-size:15px;font-weight:600}
.about__cell p{margin-top:8px;font-size:14.5px;color:var(--muted)}
.waveform{width:100%;height:120px;margin-top:64px;overflow:visible}
.waveform path{fill:none;stroke:var(--ink);stroke-width:1.25;opacity:.5}
.waveform circle{fill:var(--accent)}

/* ============================================================
   02 能力：粘性横向滚动
   ============================================================ */
.pin{position:relative}
.pin__sticky{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;justify-content:center;overflow:hidden}
.pin__head{padding:0 var(--pad) 30px;display:flex;justify-content:space-between;align-items:baseline;gap:20px}
.pin__track{display:flex;gap:clamp(16px,2vw,34px);padding:0 var(--pad);will-change:transform}
.card{flex:0 0 auto;width:clamp(260px,30vw,440px)}
.card .media{aspect-ratio:5/4}
.card__no{display:flex;justify-content:space-between;align-items:baseline;margin-top:18px}
.card h3{margin-top:10px;font-size:clamp(17px,1.5vw,22px);font-weight:700}
.card p{margin-top:8px;font-size:14.5px;color:var(--muted);max-width:34ch}
.pin__bar{margin:34px var(--pad) 0;height:1px;background:var(--line);position:relative}
.pin__bar i{position:absolute;left:0;top:0;height:1px;width:0;background:var(--accent)}

/* ============================================================
   服务入口
   ============================================================ */
.entries{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:34px;
}
.entry{
  background:var(--paper);padding:clamp(24px,3vw,40px);display:flex;flex-direction:column;
  min-height:238px;transition:background .45s var(--ease);
}
.entry h3{margin-top:16px;font-size:clamp(17px,1.6vw,22px);font-weight:700}
.entry p{margin-top:10px;color:var(--muted);font-size:14.5px;max-width:30ch}
.entry__go{margin-top:auto;padding-top:26px;display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-2)}
.entry__go i{width:22px;height:1px;background:currentColor;transition:width .45s var(--ease)}
a.entry:hover{background:var(--paper-2)}
a.entry:hover .entry__go i{width:42px}
.entry--soon{cursor:default}
.entry--soon h3,.entry--soon .entry__go{color:var(--muted)}

/* ============================================================
   03 流程（手风琴）
   ============================================================ */
.steps{border-top:1px solid var(--line)}
.step{border-bottom:1px solid var(--line)}
.step__btn{display:grid;grid-template-columns:64px 1fr auto;align-items:center;gap:20px;
  width:100%;padding:26px 0;text-align:left;transition:padding-left .5s var(--ease)}
.step__btn:hover{padding-left:14px}
.step__btn h3{font-size:clamp(17px,1.6vw,23px);font-weight:600}
.step__plus{position:relative;width:14px;height:14px}
.step__plus::before,.step__plus::after{content:"";position:absolute;background:var(--ink);transition:transform .5s var(--ease)}
.step__plus::before{left:0;top:6.5px;width:14px;height:1px}
.step__plus::after{left:6.5px;top:0;width:1px;height:14px}
.step.open .step__plus::after{transform:scaleY(0)}
.step__body{overflow:hidden;height:0;transition:height .6s var(--ease)}
.step__body p{padding:0 0 30px 84px;max-width:62ch;color:var(--muted);font-size:15.5px}

/* ============================================================
   联系
   ============================================================ */
.contact{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,6vw,110px)}
.info{display:grid;gap:0}
.info__row{display:grid;grid-template-columns:96px 1fr;gap:18px;padding:20px 0;border-top:1px solid var(--line)}
.info__row:last-child{border-bottom:1px solid var(--line)}
.info__row b{font-size:15px;font-weight:500}
.info__row span{color:var(--muted);font-size:15px}
.form{display:grid;gap:22px;align-content:start}
.field{position:relative;border-bottom:1px solid var(--line)}
.field label{display:block;font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--muted);margin-bottom:7px}
.field input,.field textarea{width:100%;border:0;background:none;padding:0 0 12px;font:inherit;
  font-size:16px;color:var(--ink);outline:none;resize:vertical}
.field input::placeholder,.field textarea::placeholder{color:var(--muted)}
.field::after{content:"";position:absolute;left:0;bottom:-1px;width:100%;height:1px;background:var(--ink);
  transform:scaleX(0);transform-origin:left;transition:transform .5s var(--ease)}
.field:focus-within::after{transform:none}
.field.err::after{background:#c0392b;transform:none}
.form__note{font-size:13px;color:var(--muted)}
.form__ok{font-size:13.5px;color:var(--accent);opacity:0;transform:translateY(-4px);
  transition:opacity .5s var(--ease),transform .5s var(--ease)}
.form__ok.on{opacity:1;transform:none}

/* ============================================================
   子页（功能页）首屏
   ============================================================ */
.page-hero{padding:clamp(132px,17vh,196px) 0 clamp(48px,7vh,88px);border-bottom:1px solid var(--line)}
.crumb{display:flex;gap:10px;align-items:center;margin-bottom:24px;
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.crumb a:hover{color:var(--ink)}
.crumb s{text-decoration:none;opacity:.5}
.page-hero h1{font-size:clamp(30px,5.2vw,76px);line-height:1.06;font-weight:800;letter-spacing:-.015em}
.page-hero__sub{margin-top:26px;max-width:54ch;color:var(--ink-2);font-size:clamp(15px,1.15vw,17.5px)}
.page-hero__acts{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap;align-items:center}
.page-hero__acts .form__note{margin:0}

/* 状态条 */
.status{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);
  border-bottom:1px solid var(--line)}
.status__cell{background:var(--paper);padding:24px clamp(16px,2.4vw,32px)}
.status__cell b{display:block;margin-top:10px;font-size:15px;font-weight:600}
.status__cell b.ph{font-weight:400}
.dot{display:inline-block;width:6px;height:6px;background:var(--accent);vertical-align:middle;margin-right:8px}

/* 代码/接口占位 */
.code{margin-top:26px;background:var(--paper-2);border:1px solid var(--line-2);padding:24px;
  overflow-x:auto}
.code pre{margin:0;font-family:var(--mono);font-size:12.5px;line-height:2;color:var(--ink-2);white-space:pre}
.code .k{color:var(--accent)}
.code .c{color:var(--muted)}

/* 两栏说明 */
.split{display:grid;grid-template-columns:minmax(180px,.9fr) 2.1fr;gap:clamp(24px,5vw,90px)}

/* 底部行动条 */
.callout{border-top:1px solid var(--line);border-bottom:1px solid var(--line);
  padding:clamp(40px,6vw,76px) 0}
.callout__in{display:flex;justify-content:space-between;align-items:flex-end;gap:28px;flex-wrap:wrap}
.callout h2{font-size:clamp(24px,3vw,46px);font-weight:800;letter-spacing:-.01em;line-height:1.15}

/* ============================================================
   页脚
   ============================================================ */
.foot{border-top:1px solid var(--line);margin-top:var(--sec);padding:34px 0 46px}
.foot__in{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--muted)}
.foot__in a:hover{color:var(--ink)}

/* ============================================================
   降级：无 JS / 关闭动效 / 系统减少动效
   ============================================================ */
html:not(.js) .rv{opacity:1;transform:none}
html:not(.js) .mask>span{transform:none}
html:not(.js) .shead::before{transform:none}
html:not(.js) .media>i{transform:scaleY(0)}
html:not(.js) .step__body{height:auto}
html:not(.js) .pin__sticky{position:static;height:auto;padding:var(--sec) 0}
html:not(.js) .pin__track{flex-wrap:wrap}
html:not(.js) .nav{display:flex;flex-wrap:wrap}
html:not(.js) .head{position:static}
html:not(.js) .head__in{height:auto;min-height:var(--head-h);flex-wrap:wrap;padding-top:12px;padding-bottom:12px}
html:not(.js) .burger{display:none}
html.no-motion *,html.no-motion *::before,html.no-motion *::after{
  animation:none!important;transition:none!important}
html.no-motion .rv{opacity:1;transform:none}
html.no-motion .shead::before{transform:none}
html.no-motion .mask>span{transform:none}
html.no-motion .media>i{transform:scaleY(0)}
html.no-motion .pin{height:auto!important}
html.no-motion .pin__sticky{position:static;height:auto;padding:var(--sec) 0}
html.no-motion .pin__track{flex-wrap:wrap;transform:none!important}
html.no-motion .wave span{animation:none;height:40%}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1200px){
  .brand em{display:none}      /* 窄屏优先保证导航与服务入口可见 */
}
@media (max-width:1080px){
  .hero__grid{grid-template-columns:1fr}
  .hero__meta{text-align:left;justify-items:start;padding-bottom:0}
  .about,.split{grid-template-columns:1fr;gap:32px}
  .contact{grid-template-columns:1fr}
  .status{grid-template-columns:repeat(2,1fr)}
  .entries{grid-template-columns:1fr}
}
@media (max-width:860px){
  .nav{display:none}
  .burger{display:block}
  .head__right{gap:14px}
  .pin{height:auto!important}
  .pin__sticky{position:static;height:auto;padding:var(--sec) 0}
  .pin__track{flex-direction:column;transform:none!important;padding:0 var(--pad)}
  .card{width:100%}
  .pin__bar{display:none}
  .about__grid{grid-template-columns:1fr}
  .step__body p{padding-left:0}
}
@media (max-width:560px){
  .display{font-size:clamp(32px,10.5vw,48px)}
  .hero{padding-top:120px}
  .step__btn{grid-template-columns:34px 1fr auto;gap:12px}
  .head__cta{display:none}
  .status{grid-template-columns:1fr}
  .hero__cta .btn,.page-hero__acts .btn{width:100%;justify-content:center}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .rv{opacity:1;transform:none}
  .shead::before{transform:none}
  .mask>span{transform:none}
  .media>i{transform:scaleY(0)}
  .wave span{animation:none;height:40%}
  .pin{height:auto!important}
  .pin__sticky{position:static;height:auto;padding:var(--sec) 0}
  .pin__track{flex-wrap:wrap;transform:none!important}
}

/* ---------- 悦明声视觉与交互完善 ---------- */
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:5px}
.skip-link{position:fixed;left:20px;top:12px;z-index:100;padding:10px 18px;background:var(--ink);color:white;transform:translateY(-160%)}
.skip-link:focus{transform:none}
html.no-motion{scroll-behavior:auto}
.btn--primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn--primary::before{background:var(--ink)}
.btn i{position:relative}
.btn i::after{content:"";position:absolute;right:0;top:-3px;width:7px;height:7px;border-right:1px solid currentColor;border-top:1px solid currentColor;transform:rotate(45deg)}
.hero{padding-top:clamp(110px,14vh,160px)}
.hero__eyebrow{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:40px}
.hero__eyebrow .tag{font-size:11px;letter-spacing:.1em}
.hero__edition{font:10px var(--mono);letter-spacing:.15em;color:var(--muted)}
.hero__layout{display:grid;grid-template-columns:1.25fr 1fr;gap:clamp(28px,5vw,90px);align-items:center}
.hero__copy{min-width:0}
.hero__grid{display:block}
.display{font-size:clamp(38px,5.8vw,88px);line-height:1.24;letter-spacing:-.055em}
.accent-text{color:var(--accent)}
.hero__meta{display:none}
.hero__sub{margin-top:25px;line-height:1.9;font-size:16px;max-width:40ch}
.hero__cta{margin-top:30px}
.hero__footer{display:flex;justify-content:space-between;gap:20px;margin-top:44px;padding-top:18px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}
.hero__footer a{color:var(--ink-2);display:flex;gap:20px;align-items:center}
.hero__footer a span{font-size:20px;color:var(--accent)}
.wave{margin-top:26px;height:38px}
.wave span{background:var(--accent);opacity:.3}
.signal{position:relative;aspect-ratio:1.13;background:#171918;color:var(--paper);overflow:hidden;padding:24px;display:flex;flex-direction:column;justify-content:space-between}
.signal::before{content:"";position:absolute;inset:0;background-image:linear-gradient(#ffffff07 1px,transparent 1px),linear-gradient(90deg,#ffffff07 1px,transparent 1px);background-size:32px 32px}
.signal__top,.signal__bottom{display:flex;justify-content:space-between;gap:10px;position:relative;z-index:2;font:10px var(--mono);letter-spacing:.1em;color:#b7b9b1}
.signal__badge{color:#c2c9ff;letter-spacing:.02em}
.signal__bottom{border-top:1px solid #ffffff24;padding-top:16px;font-size:11px}
.signal__art{position:absolute;inset:17% 10%;display:grid;place-items:center}
.signal__orbit{width:80%;aspect-ratio:1;border:1px solid #ffffff25;border-radius:50%;position:absolute}
.signal__orbit::before,.signal__orbit::after{content:"";position:absolute;border:1px solid #ffffff20;border-radius:50%;inset:16%;transform:rotateX(55deg) rotateZ(-25deg)}
.signal__orbit::after{inset:-9%;transform:rotateY(58deg) rotateZ(30deg)}
.signal__core{position:absolute;width:92%;height:65%;background:repeating-linear-gradient(90deg,transparent 0 5px,#5267ff 5px 7px,transparent 7px 12px);clip-path:polygon(0 48%,5% 44%,10% 54%,15% 39%,20% 63%,25% 25%,30% 76%,35% 12%,40% 88%,45% 3%,50% 100%,55% 8%,60% 83%,65% 20%,70% 71%,75% 32%,80% 61%,85% 42%,90% 55%,95% 46%,100% 50%,95% 54%,90% 45%,85% 58%,80% 39%,75% 68%,70% 29%,65% 80%,60% 17%,55% 92%,50% 0,45% 97%,40% 12%,35% 88%,30% 24%,25% 75%,20% 37%,15% 61%,10% 46%,5% 56%,0 52%);animation:signal-breathe 6s ease-in-out infinite alternate;filter:drop-shadow(0 0 12px #344fff)}
.signal__axis{width:100%;height:1px;background:#8b98ff44;position:absolute}
@keyframes signal-breathe{from{transform:scaleY(.82);opacity:.75}to{transform:scaleY(1.05);opacity:1}}
.about{grid-template-columns:1fr 1.45fr;gap:clamp(40px,8vw,130px)}
.about__lead{font-size:clamp(24px,2.7vw,39px);line-height:1.4;font-weight:700;letter-spacing:-.035em}
.about__body{font-size:clamp(16px,1.4vw,20px);line-height:1.95;margin-top:40px;max-width:48ch}
.about__cell h4{font-size:17px}
.about__cell p,.card p,.entry p,.step__body p{color:var(--ink-2)}
.media--about{aspect-ratio:1.55;background:#deddd5;max-width:480px}
.media--about::before{background-image:linear-gradient(#1111100b 1px,transparent 1px),linear-gradient(90deg,#1111100b 1px,transparent 1px);background-size:26px 26px}
.about-art{position:absolute;inset:16%;display:flex;align-items:center;justify-content:center;gap:12px}
.about-art span{width:14%;height:85%;border:1px solid var(--accent);border-radius:50%;transform:rotate(-28deg)}
.about-art span:nth-child(2),.about-art span:nth-child(4){height:65%}
.about-art span:nth-child(1),.about-art span:nth-child(5){height:40%}
.media--about figcaption{color:var(--ink-2);font-size:10px}
.section-title{margin-top:20px;font-size:clamp(26px,3vw,44px);line-height:1.4;font-weight:700;letter-spacing:-.04em}
.section-heading{display:flex;justify-content:space-between;align-items:end;gap:30px}
.section-heading p{max-width:30ch;font-size:14px;color:var(--ink-2)}
.pin__head{align-items:end;padding-bottom:32px}
.card{width:clamp(280px,29vw,400px)}
.media--concept::before{background:linear-gradient(90deg,transparent 49.8%,#1111100c 50%,transparent 50.2%),linear-gradient(transparent 49.8%,#1111100c 50%,transparent 50.2%)}
.media--concept{display:grid;place-items:center;background:#e4e2da}
.concept-art{font:100px var(--mono);letter-spacing:-.12em;color:var(--accent);position:relative;line-height:1}
.concept-art>span{font-size:56px;position:absolute;right:-35px;bottom:-10px}
.concept--signal{background:#2338e8}
.concept--signal .concept-art{font-size:170px;letter-spacing:0;color:var(--paper)}
.concept--signal::before{background:repeating-linear-gradient(90deg,transparent 0 25px,#ffffff0d 25px 26px)}
.concept--signal figcaption{color:#e2e5ff}
.concept--connect .concept-art{font-size:100px;letter-spacing:.12em}
.concept--verify{background:#d7dccf}
.concept--verify .concept-art{font-size:155px;color:#283631}
.concept--iterate{background:#171918}
.concept--iterate .concept-art{font-size:145px;color:#a2afff}
.concept--iterate figcaption{color:#c1c5b9}
.entries{margin-top:36px}
.entry{min-height:300px;padding:32px}
.entry:first-child{background:var(--accent);color:#fff}
.entry:first-child .num,.entry:first-child p,.entry:first-child .entry__go{color:#e0e4ff}
.entry:first-child:hover{background:#182cc7}
.entry h3{margin-top:32px}
.entry__go{font-family:var(--font);font-size:13px;letter-spacing:0}
.entry__go i{position:relative}
.entry__go i::after{content:"";position:absolute;right:0;top:-3px;width:7px;height:7px;border-top:1px solid currentColor;border-right:1px solid currentColor;transform:rotate(45deg)}
.step__btn{min-height:92px}
.step__body p{font-size:15px;max-width:70ch}
.contact__intro{margin-top:20px;max-width:36ch;color:var(--ink-2);font-size:15px}
.field label{font-family:var(--font);font-size:13px;letter-spacing:0;color:var(--ink-2)}
.field input,.field textarea{padding-top:5px}
.field.err label{color:#a62822}
.form>.btn{justify-self:start}
.form__ok{opacity:1;transform:none;min-height:0}
.form__ok:empty{display:none}
.brief{padding:22px;background:var(--paper-2);border:1px solid var(--line);min-width:0}
.brief pre{white-space:pre-wrap;overflow-wrap:anywhere;font:13px/1.8 var(--font);margin:0 0 18px}
.status__cell .dot{background:#918b7e}
.code{padding:0;background:#171918}
.code__head{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:12px 20px;border-bottom:1px solid #ffffff26;color:#c1c5bc;font:11px var(--mono)}
.code__head button{font:12px var(--font);border:1px solid #ffffff44;padding:5px 12px;color:#eee}
.code__head button:focus-visible{outline-color:#a2afff}
.code pre{padding:24px;color:#ddd;line-height:1.9;font-size:12px}
.code .k{color:#a2afff}.code .c{color:#a6aa9f}
.service-note{margin-top:30px;padding:16px 20px;border-left:2px solid var(--accent);background:var(--paper-2);max-width:65ch;font-size:13px;color:var(--ink-2)}
.page-hero h1{line-height:1.2;letter-spacing:-.04em}
.callout{background:var(--paper-2)}
.foot{padding-bottom:76px}
@media (min-width:1081px) and (max-width:1350px){.head__right{gap:18px}.nav{gap:20px}.brand{font-size:15px}}
@media (max-width:1080px){
  .hero__layout{grid-template-columns:1.15fr 1fr;gap:28px}
  .display{font-size:clamp(38px,5.6vw,64px)}
  .signal{padding:18px}
  .hero__cta{gap:10px}.hero__cta .btn{padding:12px 18px;font-size:13px}
  .about,.split{grid-template-columns:1fr;gap:32px}
  .about__body{margin-top:0;max-width:60ch}
  .about .media--about{display:none}
  .about__grid{margin-top:32px}
  .entries{grid-template-columns:repeat(3,minmax(0,1fr))}
  .entry{padding:24px;min-height:290px}
}
@media (max-width:860px){
  .hero__layout{grid-template-columns:1fr}
  .display{font-size:clamp(40px,8.5vw,72px)}
  .hero__eyebrow{margin-bottom:28px}.hero__edition{display:none}
  .signal{aspect-ratio:1.8;max-height:380px}
  .signal__art{inset:6% 20%}
  .hero__footer{margin-top:28px;font-size:11px}
  .hero__footer>a{gap:10px;white-space:nowrap}
  .pin__head{align-items:start;flex-direction:column;gap:16px}
  .pin__track{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px 20px}
  .card{min-width:0;width:100%}.card p{font-size:13px}
  .concept-art{font-size:80px}.concept--connect .concept-art{font-size:70px}.concept--signal .concept-art{font-size:120px}
  .concept--iterate .concept-art,.concept--verify .concept-art{font-size:110px}
  .entries{grid-template-columns:1fr}.entry{min-height:235px}.entry h3{margin-top:16px}
  .entry p{max-width:48ch}.section-heading{display:block}.section-heading p{margin-top:14px;max-width:none}
  .about__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:560px){
  .brand{font-size:13px;gap:8px}.brand img{width:40px;height:40px}
  .hero{padding-top:104px}.hero__eyebrow .tag{font-size:9px;letter-spacing:.05em}
  .hero__cta .btn{width:auto;padding:12px 16px}
  .hero__sub{font-size:14px}.hero__footer>span{max-width:20ch}
  .signal{aspect-ratio:1.3}.signal__art{inset:15% 10%}
  .signal__top,.signal__bottom{font-size:9px;letter-spacing:.02em}
  .pin__track{grid-template-columns:1fr;gap:36px}.card .media{aspect-ratio:1.55}
  .about__grid{gap:24px 16px}.about__cell h4{font-size:15px}.about__cell p{font-size:13px}
  .form>.btn{width:100%;justify-content:center}
  .code pre{padding:18px;font-size:11px}
  .foot__in{font-size:10px;letter-spacing:0}
}
@media (min-width:861px) and (max-height:639px){
  .pin{height:auto!important}.pin__sticky{position:static;height:auto;padding:var(--sec) 0}
  .pin__track{flex-wrap:wrap;transform:none!important}.pin__bar{display:none}
}
html.no-motion .pin__track{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:30px}
html.no-motion .card{width:100%}
@media (prefers-reduced-motion:reduce){
  .pin__track{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,280px),1fr));gap:30px}
  .card{width:100%}.pin__bar{display:none}
}

/* ============================================================
   导航滑动指示器（JS 启用；失败时回退到各链接自带下划线）
   ============================================================ */
.nav{position:relative}
.nav__ink{
  position:absolute;left:0;bottom:0;height:1.5px;background:var(--ink);
  transform-origin:left;transform:translateX(0) scaleX(1);pointer-events:none;
  transition:transform .45s var(--ease),width .45s var(--ease),opacity .3s;will-change:transform,width;
  opacity:0;
}
.nav.js-ink .nav__ink{opacity:1}
.nav.js-ink a::after{display:none}

/* ============================================================
   页面转场：离场淡出
   ============================================================ */
body.leaving{opacity:0;transition:opacity .22s ease-out}

/* ============================================================
   服务入口空态
   ============================================================ */
.entries__empty{
  grid-column:1/-1;padding:48px 24px;text-align:center;color:var(--muted);
  font-size:14px;background:var(--paper);
}

/* hero 图改用 <picture>：display:contents 让它不产生盒子，
   布局与内部 img 完全保持原样（WebP 优先，JPEG 兜底）。 */
.yms-bscan__pic{display:contents}