/* ============================================================
   江南平台指南 · 共享外壳样式表  /assets/site.css
   骨架：侧边签表轨道 + 正文横向层级，无传统 Hero
   ============================================================ */

:root{
  --ink:#16232B;
  --dai:#22515E;
  --grey:#3E5560;
  --paper:#F6F3EC;
  --card:#FFFFFF;
  --wash-1:#4C6E78;
  --wash-2:#7C9AA3;
  --wash-3:#A9B8BC;
  --wash-4:#D8DEE0;
  --green:#C6FF3D;
  --orange:#FF7A2E;
  --red:#D94F3D;

  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --rail-w:248px;
  --pad:clamp(18px,4vw,44px);
  --measure:38em;
  --radius:18px;
  --radius-sm:10px;
  --line:rgba(22,35,43,.14);
  --line-dark:rgba(246,243,236,.14);
  --shadow:0 18px 44px -30px rgba(22,35,43,.5);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  padding-left:var(--rail-w);
  background-color:var(--paper);
  background-image:
    radial-gradient(120% 70% at 100% 0%,rgba(34,81,94,.07),transparent 62%),
    radial-gradient(90% 60% at 0% 100%,rgba(255,122,46,.05),transparent 66%);
  background-attachment:fixed;
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-wrap:break-word;
  -webkit-font-smoothing:antialiased;
}
img,svg,video{max-width:100%;height:auto;display:block;}
ul,ol{padding-left:1.1em;}
a{color:var(--dai);text-decoration-color:rgba(34,81,94,.35);text-underline-offset:3px;}
a:hover{color:var(--ink);}

:focus-visible{outline:2px solid var(--orange);outline-offset:3px;border-radius:6px;}
.site-header :focus-visible,.site-footer :focus-visible{outline-color:var(--green);}

.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;}

/* ---------- 中文排版 ---------- */
h1,h2,h3,h4{
  font-family:var(--serif);
  font-weight:800;
  line-height:1.2;
  letter-spacing:.02em;
  color:var(--ink);
  margin:0 0 .6em;
  text-wrap:balance;
}
h1{font-size:clamp(2rem,4.6vw,3.4rem);}
h2{font-size:clamp(1.5rem,2.8vw,2rem);}
h3{font-size:clamp(1.15rem,2vw,1.35rem);font-weight:700;}
h4{font-size:1.02rem;font-weight:700;letter-spacing:.04em;}
p{margin:0 0 1.15em;text-wrap:pretty;}
strong{font-weight:700;color:var(--dai);}
small{font-size:.8rem;}
code,kbd,samp{font-family:var(--mono);font-size:.88em;background:rgba(34,81,94,.08);padding:.15em .4em;border-radius:5px;}
mark{background:rgba(198,255,61,.55);color:var(--ink);padding:0 .2em;}
abbr[title]{text-decoration:underline dotted;text-underline-offset:3px;}

/* ---------- 顶部滚动进度 ---------- */
.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:90;
  background:rgba(22,35,43,.08);pointer-events:none;
}
.scroll-progress__bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--dai),var(--green));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .18s linear;
}

/* ---------- 头部：品牌轨道 ---------- */
.site-header{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:80;
  background:
    radial-gradient(120% 55% at 0% 0%,rgba(34,81,94,.9),rgba(22,35,43,0) 62%),
    var(--ink);
  border-right:1px solid var(--line-dark);
  color:var(--paper);
}
.rail{
  display:flex;flex-direction:column;gap:20px;
  height:100%;padding:28px 20px 22px;overflow-y:auto;
}
.rail__top{display:flex;align-items:center;justify-content:space-between;gap:12px;}

.brand{display:flex;align-items:center;gap:12px;min-width:0;text-decoration:none;color:inherit;}
.brand__mark{
  flex:none;width:42px;height:42px;display:grid;place-items:center;
  border-radius:14px 14px 14px 4px;
  background:var(--green);color:var(--ink);
  font-family:var(--mono);font-size:13px;font-weight:700;letter-spacing:.08em;
  box-shadow:inset 0 0 0 1px rgba(22,35,43,.16);
}
.brand__text{display:block;min-width:0;}
.brand__name{
  display:block;font-family:var(--serif);font-weight:700;
  font-size:1.06rem;letter-spacing:.04em;color:var(--paper);
}
.brand__domain{
  display:block;font-family:var(--mono);font-size:.6rem;letter-spacing:.01em;
  color:var(--wash-3);overflow-wrap:anywhere;
}
.brand:hover .brand__name{color:var(--green);}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:8px 14px;border-radius:999px;
  border:1px solid rgba(246,243,236,.3);background:transparent;color:var(--paper);
  font-family:var(--sans);font-size:.78rem;font-weight:600;letter-spacing:.08em;
  cursor:pointer;transition:background-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{background:rgba(246,243,236,.1);}
.nav-toggle__icon{position:relative;display:block;width:16px;height:10px;}
.nav-toggle__icon::before,.nav-toggle__icon::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;background:currentColor;
  transition:transform .24s var(--ease);
}
.nav-toggle__icon::before{top:0;}
.nav-toggle__icon::after{bottom:0;}
.nav-toggle[aria-expanded="true"]{background:var(--green);color:var(--ink);border-color:var(--green);}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::before{transform:translateY(4px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] .nav-toggle__icon::after{transform:translateY(-4px) rotate(-45deg);}

.rail__tagline{
  margin:0;padding-left:10px;border-left:2px solid rgba(198,255,61,.5);
  font-family:var(--serif);font-size:.86rem;line-height:1.6;letter-spacing:.06em;color:var(--wash-3);
}

.rail__drawer{display:flex;flex-direction:column;gap:20px;flex:1 1 auto;min-height:0;}

/* 签表形态导航 */
.bracket{display:flex;flex-direction:column;}
.bracket__title{
  margin:0 0 10px;font-family:var(--sans);font-size:.66rem;font-weight:600;
  letter-spacing:.24em;color:var(--wash-2);
}
.bracket__list{
  position:relative;list-style:none;margin:0;padding:0 0 0 14px;
  display:flex;flex-direction:column;gap:2px;
}
.bracket__list::before{
  content:"";position:absolute;left:5px;top:8px;bottom:8px;width:1px;
  background:linear-gradient(180deg,var(--green) 0%,rgba(198,255,61,.4) 46%,rgba(198,255,61,.06) 100%);
}
.bracket__node{position:relative;}
.bracket__node::before{
  content:"";position:absolute;left:-9px;top:50%;width:9px;height:1px;
  background:rgba(198,255,61,.35);
}
.bracket__link{
  position:relative;display:flex;align-items:center;gap:10px;
  padding:9px 12px 9px 10px;border-radius:10px;
  color:var(--wash-4);text-decoration:none;font-size:.92rem;letter-spacing:.03em;
  transition:color .2s var(--ease),background-color .2s var(--ease),transform .2s var(--ease);
}
.bracket__dot{
  flex:none;width:8px;height:8px;border:1px solid var(--wash-2);background:var(--ink);
  transform:rotate(45deg);transition:background-color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.bracket__label{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.bracket__link:hover{color:var(--paper);background:rgba(246,243,236,.07);transform:translateX(2px);}
.bracket__link:hover .bracket__dot{border-color:var(--green);}
.bracket__link[aria-current="page"]{
  color:var(--paper);font-weight:600;background:rgba(198,255,61,.12);
}
.bracket__link[aria-current="page"] .bracket__dot{
  background:var(--green);border-color:var(--green);box-shadow:0 0 0 4px rgba(198,255,61,.18);
}
.bracket__link[aria-current="page"]::after{
  content:"";position:absolute;right:-14px;top:50%;width:12px;height:1px;background:var(--green);
}

/* 轨道底部 */
.rail__foot{
  margin-top:auto;display:flex;flex-direction:column;gap:14px;
  padding-top:18px;border-top:1px solid var(--line-dark);
}
.util{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px;}
.util__link{
  display:inline-block;padding:5px 10px;border-radius:999px;
  border:1px solid rgba(246,243,236,.22);color:var(--wash-4);
  font-size:.72rem;letter-spacing:.08em;text-decoration:none;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.util__link:hover{background:var(--paper);border-color:var(--paper);color:var(--ink);}
.rail__cta{width:100%;}
.rail__live{
  margin:0;display:flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:.66rem;letter-spacing:.02em;color:var(--wash-2);
}
.rail__pulse{
  flex:none;width:7px;height:7px;border-radius:50%;background:var(--green);
  box-shadow:0 0 0 0 rgba(198,255,61,.6);animation:pulse 2.4s infinite;
}
@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(198,255,61,.55);}
  70%{box-shadow:0 0 0 9px rgba(198,255,61,0);}
  100%{box-shadow:0 0 0 0 rgba(198,255,61,0);}
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;margin-top:clamp(44px,6vw,84px);
  background:var(--ink);color:var(--wash-4);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;bottom:0;height:140px;pointer-events:none;
  background:radial-gradient(58% 100% at 12% 100%,rgba(198,255,61,.13),transparent 72%);
}
.footer__inner{
  position:relative;max-width:1180px;margin:0 auto;
  padding:clamp(40px,6vw,72px) var(--pad) 26px;
  display:grid;gap:clamp(26px,4vw,46px);
  grid-template-columns:1.6fr 1fr 1fr 1.5fr;
}
.footer__lead{display:flex;flex-direction:column;gap:14px;}
.footer__summary{
  margin:0;max-width:34em;font-size:.92rem;line-height:1.8;color:var(--wash-3);
}
.footer__live{
  margin:0;display:flex;align-items:center;gap:8px;
  font-family:var(--mono);font-size:.68rem;color:var(--wash-2);
}
.footer__pulse{flex:none;width:6px;height:6px;border-radius:50%;background:var(--orange);}
.footer__col{display:block;}
.footer__col-title{
  margin:0 0 14px;font-family:var(--sans);font-size:.7rem;font-weight:600;
  letter-spacing:.2em;color:var(--paper);
}
.footer__list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px;}
.footer__link{
  color:var(--wash-3);font-size:.9rem;letter-spacing:.02em;text-decoration:none;
  transition:color .2s var(--ease);
}
.footer__link:hover{color:var(--green);}
.contact-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px;}
.contact-list__item{
  display:grid;grid-template-columns:66px minmax(0,1fr) auto;align-items:center;gap:10px;
  font-size:.86rem;
}
.contact-list__key{font-size:.68rem;letter-spacing:.14em;color:var(--wash-2);}
.contact-list__val{
  font-family:var(--mono);font-size:.78rem;letter-spacing:.01em;color:var(--paper);
  overflow-wrap:anywhere;
}
.copy-btn{
  display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border-radius:999px;
  border:1px solid rgba(246,243,236,.26);background:transparent;color:var(--wash-3);
  font-family:var(--sans);font-size:.68rem;font-weight:600;letter-spacing:.08em;
  cursor:pointer;transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.copy-btn:hover{background:var(--green);border-color:var(--green);color:var(--ink);}
.copy-btn[data-copied="true"]{background:var(--green);border-color:var(--green);color:var(--ink);}
.footer__meta{
  grid-column:1 / -1;display:flex;flex-wrap:wrap;gap:8px 26px;align-items:center;justify-content:space-between;
  padding-top:20px;border-top:1px solid var(--line-dark);
  font-size:.76rem;color:var(--wash-2);
}
.footer__legal,.footer__copy,.footer__addr{margin:0;}
.footer__legal{font-family:var(--mono);letter-spacing:.04em;}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;left:12px;top:-70px;z-index:95;
  padding:10px 18px;border-radius:999px;
  background:var(--green);color:var(--ink);
  font-size:.84rem;font-weight:600;letter-spacing:.06em;text-decoration:none;
  transition:top .2s var(--ease);
}
.skip-link:focus-visible{top:12px;}

/* ---------- 布局容器 ---------- */
.container{width:100%;max-width:1180px;margin:0 auto;padding:0 var(--pad);}
main{display:block;}
#main-content{scroll-margin-top:80px;}
.section{padding:clamp(46px,7vw,92px) 0;}
.section--tight{padding-top:0;}
.section--narrow > .container{max-width:840px;}
.section--wide > .container{max-width:none;padding:0 var(--pad);}
.section--tint{
  background:linear-gradient(180deg,rgba(216,222,224,.42),rgba(246,243,236,0) 88%);
}
.grid{display:grid;gap:clamp(16px,2.4vw,26px);}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));}

/* ---------- 文本组件 ---------- */
.prose{max-width:var(--measure);font-size:1.06rem;line-height:1.75;color:var(--ink);}
.prose p{margin:0 0 1.15em;}
.prose h2,.prose h3{margin-top:1.6em;}
.prose ul,.prose ol{max-width:var(--measure);}
.prose li{margin:.35em 0;}
.prose blockquote{
  margin:1.4em 0;padding:2px 0 2px 18px;border-left:3px solid var(--green);
  font-family:var(--serif);color:var(--grey);
}
.prose a{font-weight:500;}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;margin:0 0 14px;
  font-size:.72rem;font-weight:600;letter-spacing:.2em;color:var(--dai);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--orange);}
.annotation{
  margin:0;padding-left:12px;border-left:2px solid var(--wash-4);
  font-size:.8rem;line-height:1.7;color:var(--wash-1);max-width:32em;
}
.data-table{
  width:100%;border-collapse:collapse;background:var(--card);
  border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden;font-size:.9rem;
}
.data-table caption{
  padding:12px 16px;text-align:left;font-size:.72rem;letter-spacing:.16em;color:var(--wash-1);
}
.data-table th,.data-table td{padding:12px 16px;text-align:left;border-bottom:1px solid var(--line);}
.data-table thead th{
  font-size:.72rem;font-weight:600;letter-spacing:.12em;color:var(--wash-1);
  background:rgba(216,222,224,.35);
}
.data-table td:not(:first-child){font-family:var(--mono);font-variant-numeric:tabular-nums slashed-zero;}
.data-table tbody tr:last-child td{border-bottom:0;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5rem;
  padding:12px 22px;border-radius:999px;border:1px solid transparent;
  font-family:var(--sans);font-size:.86rem;font-weight:600;letter-spacing:.06em;
  text-decoration:none;cursor:pointer;
  background:var(--ink);color:var(--paper);
  transition:transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn:hover{transform:translateY(-2px);color:var(--paper);}
.btn--cta{background:var(--orange);color:var(--ink);}
.btn--cta:hover{background:#FF9354;color:var(--ink);}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--ink);}
.btn--ghost:hover{background:var(--ink);color:var(--paper);}
.btn--quiet{background:var(--card);color:var(--ink);border-color:var(--line);}
.btn--quiet:hover{border-color:var(--dai);color:var(--dai);}

/* ---------- 卡片与数据 ---------- */
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(20px,3vw,28px);box-shadow:var(--shadow);
}
.card--score{border-left:4px solid var(--green);}
.card__title{font-family:var(--serif);font-size:1.16rem;font-weight:700;margin:0 0 .5rem;}
.card__meta{
  margin:0;font-family:var(--mono);font-size:.7rem;letter-spacing:.04em;color:var(--wash-1);
}
.stat{display:flex;flex-direction:column;gap:4px;}
.stat__value{
  font-family:var(--mono);font-variant-numeric:tabular-nums slashed-zero;
  font-size:clamp(1.5rem,3vw,1.95rem);font-weight:700;letter-spacing:.02em;color:var(--ink);
  line-height:1.1;
}
.stat__label{font-size:.74rem;letter-spacing:.12em;color:var(--wash-1);}
.data-band{
  display:flex;gap:14px;padding:4px 0 16px;overflow-x:auto;
  scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;
}
.data-band > *{flex:0 0 auto;scroll-snap-align:start;}

/* ---------- 标签 ---------- */
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px;padding:0;list-style:none;}
.tag{
  display:inline-flex;align-items:center;padding:5px 12px;border-radius:999px;
  background:rgba(34,81,94,.09);color:var(--dai);
  font-size:.74rem;font-weight:600;letter-spacing:.08em;
}
.tag--hot{background:rgba(255,122,46,.16);color:#A8430F;}
.tag--live{background:rgba(198,255,61,.32);color:var(--ink);}

/* ---------- 折叠面板 ---------- */
.panel{
  margin:0 0 12px;padding:0 18px;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);
}
.panel__summary{
  display:flex;align-items:center;justify-content:space-between;gap:14px;
  padding:16px 0;cursor:pointer;font-family:var(--serif);font-size:1.02rem;font-weight:700;
  list-style:none;
}
.panel__summary::-webkit-details-marker{display:none;}
.panel__summary::after{
  content:"+";font-family:var(--mono);font-size:1rem;color:var(--dai);line-height:1;
}
.panel[open] .panel__summary::after{content:"–";}
.panel__body{
  padding:0 0 18px;max-width:var(--measure);
  font-size:.96rem;line-height:1.75;color:var(--grey);
}

/* ---------- 技能树式步骤 ---------- */
.steps{list-style:none;margin:0;padding:0;display:grid;gap:14px;}
.step{
  position:relative;display:grid;gap:6px;
  padding:20px 20px 20px 58px;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
}
.step::before{
  content:"";position:absolute;left:0;top:14px;bottom:14px;width:3px;border-radius:3px;
  background:linear-gradient(180deg,var(--green),rgba(198,255,61,0));
}
.step__num{
  position:absolute;left:18px;top:20px;
  font-family:var(--mono);font-size:1rem;font-weight:700;color:var(--dai);
  font-variant-numeric:tabular-nums slashed-zero;
}
.step__title{font-family:var(--serif);font-size:1.05rem;font-weight:700;margin:0;}
.step__text{margin:0;font-size:.94rem;line-height:1.7;color:var(--grey);}

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  list-style:none;margin:0 0 22px;padding:0;display:flex;flex-wrap:wrap;gap:8px;
  font-size:.76rem;letter-spacing:.06em;color:var(--wash-1);
}
.breadcrumbs__item{display:flex;align-items:center;gap:8px;}
.breadcrumbs__item:not(:last-child)::after{content:"/";color:var(--wash-3);}
.breadcrumbs a{color:var(--wash-1);text-decoration:none;}
.breadcrumbs a:hover{color:var(--dai);}

/* ---------- 图像容器（园林窗棂取景框） ---------- */
.media{margin:0;display:block;}
.media__frame{
  position:relative;overflow:hidden;aspect-ratio:16/9;
  border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(140deg,var(--wash-4),var(--card));
}
.media__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.42;
  background:
    repeating-linear-gradient(90deg,rgba(22,35,43,.16) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(0deg,rgba(22,35,43,.16) 0 1px,transparent 1px 44px);
}
.media__img{width:100%;height:100%;object-fit:cover;}
.media__caption{
  margin-top:.6rem;font-family:var(--mono);font-size:.72rem;letter-spacing:.02em;color:var(--wash-1);
}
.media--tall .media__frame{aspect-ratio:3/4;}
.media--wide .media__frame{aspect-ratio:21/9;}

/* ---------- 滚动显现 ---------- */
html[data-js="on"] [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity 240ms var(--ease),transform 240ms var(--ease);
}
html[data-js="on"] [data-reveal][data-revealed="true"]{opacity:1;transform:none;}

/* ---------- 平板 ---------- */
@media (max-width:1023px){
  :root{--rail-w:0px;}
  body{padding-left:0;font-size:16.5px;}
  .scroll-progress{left:0;}
  .site-header{
    position:sticky;top:0;left:auto;bottom:auto;width:100%;
    border-right:0;border-bottom:1px solid var(--line-dark);
  }
  .rail{
    position:relative;flex-direction:row;align-items:center;gap:12px;
    height:auto;padding:10px 16px;overflow:visible;
  }
  .rail__top{flex:1 1 auto;min-width:0;}
  .nav-toggle{display:inline-flex;flex:none;}
  .rail__tagline{display:none;}
  .rail__drawer{
    position:absolute;top:100%;left:0;right:0;display:none;flex-direction:column;gap:18px;
    padding:18px 16px 24px;
    background:var(--ink);border-top:1px solid var(--line-dark);
    max-height:calc(100dvh - 62px);overflow-y:auto;
    box-shadow:0 26px 44px -26px rgba(0,0,0,.7);
  }
  .rail__drawer[data-open]{display:flex;}
  .rail__foot{margin-top:0;}
  .bracket__link[aria-current="page"]::after{display:none;}
  .bracket__list{padding-left:16px;}
  .footer__inner{grid-template-columns:1fr 1fr;}
  .footer__lead{grid-column:1 / -1;}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  body{font-size:16px;}
  .brand__domain{font-size:.56rem;}
  .nav-toggle__label{display:none;}
  .nav-toggle{padding:9px 12px;}
  .footer__inner{grid-template-columns:1fr;gap:30px;}
  .footer__meta{flex-direction:column;align-items:flex-start;gap:8px;}
  .contact-list__item{grid-template-columns:66px minmax(0,1fr) auto;}
  .step{padding:18px 16px 18px 50px;}
  .step__num{left:14px;}
  .section{padding:38px 0;}
}

/* ---------- 降级动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .scroll-progress__bar{transition:none;}
  .rail__pulse{animation:none;box-shadow:0 0 0 3px rgba(198,255,61,.22);}
  html[data-js="on"] [data-reveal]{opacity:1;transform:none;transition:opacity 160ms linear;}
  .data-band{flex-wrap:wrap;overflow:visible;scroll-snap-type:none;}
  .btn:hover,.bracket__link:hover{transform:none;}
}