/* ============================================================
   发条娱乐指南 · 共享样式 /assets/site.css
   奶油纸面 + 深墨绿框架 + 铜锈金刻度
   ============================================================ */

:root{
  --paper:#F4EFE2;
  --paper-lift:#FBF7EE;
  --ink:#1E1A16;
  --green:#17453B;
  --green-deep:#12312A;
  --brass:#A8792B;
  --brass-light:#D8B778;
  --steel:#7C8B8A;
  --alert:#D4622A;
  --rule:#C9BFA8;

  --font-head:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-data:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",Consolas,"Courier New",monospace;

  --rail-w:220px;
  --top-h:44px;
  --head-mobile:60px;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
@media (prefers-reduced-motion: no-preference){
  html{scroll-behavior:smooth;}
}
body,
h1,h2,h3,h4,h5,
p,figure,blockquote,dl,dd{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
img{max-width:100%;height:auto;}
button{font:inherit;color:inherit;background:none;border:0;}
a{color:inherit;}
table{border-collapse:collapse;width:100%;}

/* ---------- 中文排版底座 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    radial-gradient(circle at 16% 8%, rgba(216,183,120,.13), transparent 38%),
    radial-gradient(circle at 88% 82%, rgba(23,69,59,.08), transparent 46%);
  background-attachment:fixed;
  padding-top:var(--head-mobile);
  min-height:100vh;
}
h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:600;
  line-height:1.35;
  letter-spacing:-.005em;
  color:var(--ink);
}
h1{font-size:34px;}
h2{font-size:26px;}
h3{font-size:20px;}
h4{font-size:17px;}
p{max-width:42em;}
strong{font-weight:600;}

:focus-visible{outline:2px solid var(--alert);outline-offset:3px;}
.site-footer :focus-visible,
.header-rail :focus-visible{outline-color:var(--brass-light);}

.mono{font-family:var(--font-data);font-weight:500;letter-spacing:.02em;}

/* ---------- 跳过导航 ---------- */
.skip-link{
  position:absolute;
  left:14px;
  top:-80px;
  z-index:90;
  display:inline-block;
  padding:10px 16px;
  background:var(--green);
  color:#FBF7EE;
  border:1px solid var(--brass);
  text-decoration:none;
  font-size:14px;
  font-weight:600;
  transition:top .18s ease-out;
}
.skip-link:focus{top:12px;}

/* ---------- 头部外壳 ---------- */
.site-header{position:relative;z-index:60;}

/* 索引栏：移动端为顶部条 */
.header-rail{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:60;
  display:flex;
  align-items:center;
  gap:12px;
  min-height:var(--head-mobile);
  padding:8px 14px;
  background:linear-gradient(180deg,#17453B 0%,#12312A 100%);
  border-bottom:1px solid var(--brass);
  color:var(--paper);
}
.brand-mark{
  display:flex;
  align-items:center;
  gap:10px;
  flex:1 1 auto;
  min-width:0;
}
.brand-gear{
  position:relative;
  flex:0 0 auto;
  width:26px;
  height:26px;
  border-radius:50%;
  background:repeating-conic-gradient(from 0deg, var(--brass-light) 0 9deg, transparent 9deg 45deg);
  transition:transform .6s cubic-bezier(.2,.7,.3,1);
}
.brand-gear::after{
  content:"";
  position:absolute;
  inset:6px;
  border-radius:50%;
  background:var(--green-deep);
  border:1px solid var(--brass-light);
}
.brand-mark:hover .brand-gear{transform:rotate(12deg);}
.brand-copy{display:flex;flex-direction:column;min-width:0;}
.brand-line{
  font-family:var(--font-head);
  font-size:16px;
  font-weight:600;
  line-height:1.3;
  color:#FBF7EE;
  letter-spacing:.04em;
  white-space:nowrap;
}
.brand-tag{
  display:none;
  font-size:12px;
  line-height:1.5;
  color:rgba(244,239,226,.66);
  letter-spacing:.06em;
}

/* 移动导航按钮 */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  flex:0 0 auto;
  padding:9px 11px;
  background:rgba(216,183,120,.1);
  border:1px solid rgba(216,183,120,.5);
  color:var(--brass-light);
  font-size:13px;
  font-weight:600;
  letter-spacing:.06em;
  cursor:pointer;
}
.nav-toggle:hover{background:rgba(216,183,120,.2);}
.nav-toggle-glyph{display:inline-flex;flex-direction:column;gap:3px;width:16px;}
.nav-toggle-glyph span{
  display:block;
  height:1.5px;
  background:var(--brass-light);
  transition:transform .18s ease-out,opacity .18s ease-out;
}
.site-header[data-open] .nav-toggle-glyph span:nth-child(1){transform:translateY(4.5px) rotate(45deg);}
.site-header[data-open] .nav-toggle-glyph span:nth-child(2){opacity:0;}
.site-header[data-open] .nav-toggle-glyph span:nth-child(3){transform:translateY(-4.5px) rotate(-45deg);}

/* 导航：移动端为下拉抽屉 */
.site-nav{
  display:none;
  position:absolute;
  top:100%;
  left:0;
  right:0;
  flex-direction:column;
  gap:12px;
  max-height:calc(100vh - var(--head-mobile));
  overflow:auto;
  padding:16px 16px 22px;
  background:var(--green-deep);
  border-bottom:1px solid var(--brass);
  box-shadow:0 18px 30px -20px rgba(30,26,22,.7);
}
.site-header[data-open] .site-nav{display:flex;}

.nav-caption{
  font-family:var(--font-data);
  font-size:11px;
  font-weight:600;
  line-height:1;
  letter-spacing:.2em;
  color:var(--brass-light);
  text-transform:uppercase;
}
.nav-list{display:flex;flex-direction:column;gap:2px;}
.nav-list a{
  display:flex;
  align-items:center;
  gap:10px;
  padding:9px 10px;
  color:#E4DECD;
  font-size:15px;
  text-decoration:none;
  border-left:2px solid transparent;
  transition:background .18s ease-out,border-color .18s ease-out,color .18s ease-out;
}
.nav-list a::before{
  content:"";
  flex:0 0 auto;
  width:9px;
  height:9px;
  border-radius:50%;
  border:1px solid rgba(216,183,120,.55);
  transition:background .18s ease-out,box-shadow .18s ease-out;
}
.nav-list a:hover{background:rgba(216,183,120,.12);border-left-color:var(--brass-light);color:#FBF7EE;}
.nav-list a[aria-current="page"]{
  background:rgba(216,183,120,.16);
  border-left-color:var(--brass-light);
  color:#FFFFFF;
  font-weight:600;
}
.nav-list a[aria-current="page"]::before{
  background:var(--brass-light);
  border-color:var(--brass-light);
  box-shadow:0 0 0 3px rgba(216,183,120,.22);
}

.rail-paths{display:flex;flex-wrap:wrap;gap:8px;}
.path-chip{
  display:inline-block;
  padding:5px 9px;
  border:1px dashed rgba(216,183,120,.5);
  color:var(--brass-light);
  font-family:var(--font-data);
  font-size:11.5px;
  line-height:1.4;
  letter-spacing:.08em;
}

/* 按钮体系 */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 16px;
  border:1px solid transparent;
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  line-height:1;
  letter-spacing:.04em;
  text-decoration:none;
  cursor:pointer;
  transition:background .18s ease-out,color .18s ease-out,border-color .18s ease-out,transform .18s ease-out;
}
.btn-gold{background:var(--brass);border-color:#8C6320;color:#1E1A16;}
.btn-gold:hover{background:var(--brass-light);}
.btn-ghost{background:transparent;border-color:rgba(216,183,120,.55);color:var(--brass-light);}
.btn-ghost:hover{background:rgba(216,183,120,.14);color:#FBF7EE;}
.rail-cta{width:100%;}

/* 索引栏底部刻度 */
.rail-dial{display:none;}

/* 顶栏 */
.topbar{display:none;}

/* 滚动进度 */
[data-progress]{transform:scaleX(0);transform-origin:left center;}
.rail-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:linear-gradient(90deg,var(--brass),var(--alert));
}
.topbar-progress{
  position:absolute;
  left:0;
  bottom:-1px;
  width:100%;
  height:2px;
  background:linear-gradient(90deg,var(--brass),var(--alert));
}

/* 复制按钮 */
.copy-btn{
  display:inline-flex;
  align-items:center;
  padding:5px 9px;
  border:1px dashed rgba(216,183,120,.55);
  color:var(--brass-light);
  font-family:var(--font-data);
  font-size:12px;
  line-height:1.4;
  letter-spacing:.04em;
  cursor:pointer;
  transition:background .18s ease-out,color .18s ease-out,border-style .18s ease-out;
}
.copy-btn:hover{background:rgba(216,183,120,.16);color:#FBF7EE;}
.copy-btn[data-copied="true"]{
  border-style:solid;
  border-color:var(--brass-light);
  background:rgba(168,121,43,.4);
  color:#FBF7EE;
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:72px;
  background:var(--green-deep);
  color:#E6E0D2;
  border-top:2px solid var(--brass);
}
.footer-inner{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:48px 20px 26px;
}
.footer-brand{
  display:flex;
  flex-wrap:wrap;
  gap:24px;
  align-items:flex-start;
  justify-content:space-between;
  padding-bottom:26px;
  border-bottom:1px dashed rgba(216,183,120,.35);
}
.footer-brand-name{
  font-family:var(--font-head);
  font-size:22px;
  font-weight:600;
  line-height:1.3;
  color:#F4EFE2;
  letter-spacing:.04em;
}
.footer-brand-desc{
  margin-top:8px;
  max-width:46ch;
  font-size:14px;
  line-height:1.75;
  color:rgba(230,224,210,.72);
}
.footer-badge{
  display:flex;
  flex-direction:column;
  gap:2px;
  padding:12px 16px;
  border:1px solid rgba(216,183,120,.45);
  background:rgba(216,183,120,.08);
  font-size:12.5px;
  letter-spacing:.06em;
  color:rgba(230,224,210,.78);
}
.footer-badge .mono{font-size:26px;line-height:1.1;color:var(--brass-light);}

.footer-cols{
  display:grid;
  grid-template-columns:1fr;
  gap:26px;
  padding:30px 0;
  border-bottom:1px dashed rgba(216,183,120,.28);
}
.footer-col h3{
  margin-bottom:13px;
  font-family:var(--font-data);
  font-size:12px;
  font-weight:600;
  line-height:1.4;
  letter-spacing:.18em;
  color:var(--brass-light);
  text-transform:uppercase;
}
.footer-col ul{display:flex;flex-direction:column;gap:9px;}
.footer-col a{
  display:inline-block;
  padding-bottom:1px;
  font-size:14.5px;
  color:#DCD6C7;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s ease-out,border-color .18s ease-out;
}
.footer-col a:hover{color:#FFFFFF;border-bottom-color:var(--brass-light);}

.footer-contact{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 20px;
  padding:20px 0;
  font-family:var(--font-data);
  font-size:13px;
  line-height:1.7;
  color:rgba(230,224,210,.8);
}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  gap:8px 20px;
  justify-content:space-between;
  padding-top:16px;
  border-top:1px solid rgba(216,183,120,.22);
  font-family:var(--font-data);
  font-size:12.5px;
  letter-spacing:.04em;
  color:rgba(230,224,210,.6);
}

/* 返回顶部齿轮 */
.to-top{
  position:fixed;
  right:20px;
  bottom:20px;
  z-index:70;
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  padding:0;
  border:1px solid var(--brass);
  border-radius:50%;
  background:var(--paper-lift);
  box-shadow:0 8px 20px -12px rgba(30,26,22,.6);
  cursor:pointer;
  opacity:0;
  pointer-events:none;
  transition:opacity .2s ease-out,transform .2s ease-out;
}
.to-top[data-visible="true"]{opacity:1;pointer-events:auto;}
.to-top:hover{transform:translateY(-2px);}
.to-top::before{
  content:"";
  position:absolute;
  inset:4px;
  border-radius:50%;
  background:repeating-conic-gradient(from 0deg, rgba(168,121,43,.85) 0 9deg, transparent 9deg 45deg);
  transition:transform .5s cubic-bezier(.2,.7,.3,1);
}
.to-top:hover::before{transform:rotate(28deg);}
.to-top::after{
  content:"";
  position:absolute;
  inset:10px;
  border-radius:50%;
  background:var(--paper-lift);
  border:1px solid var(--brass);
}
.to-top-glyph{
  position:relative;
  z-index:1;
  font-family:var(--font-data);
  font-size:14px;
  font-weight:600;
  color:var(--brass);
}

/* ============================================================
   通用内容组件
   ============================================================ */
.wrap{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 20px;
}
.section{
  padding:48px 0;
  border-bottom:1px dashed var(--rule);
}
.section:last-child{border-bottom:0;}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:14px;
  margin-bottom:24px;
}
.section-title{font-size:24px;line-height:1.35;}
.eyebrow{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-data);
  font-size:11.5px;
  font-weight:600;
  line-height:1.4;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--brass);
  margin-bottom:10px;
}
.eyebrow::after{
  content:"";
  flex:1 1 auto;
  height:1px;
  background:repeating-linear-gradient(90deg,var(--rule) 0 4px,transparent 4px 9px);
}
.chapter-num{
  font-family:var(--font-data);
  font-size:38px;
  font-weight:600;
  line-height:1;
  letter-spacing:.02em;
  color:var(--green);
}
.rule-scale{
  height:14px;
  border-top:1px dashed var(--rule);
  background-image:repeating-linear-gradient(90deg,var(--rule) 0 1px,transparent 1px 10px);
  background-repeat:no-repeat;
  background-size:100% 7px;
  opacity:.9;
  margin:24px 0;
}

.card{
  position:relative;
  background:var(--paper-lift);
  border:1px solid var(--rule);
  box-shadow:0 1px 0 rgba(201,191,168,.55), 0 14px 24px -22px rgba(30,26,22,.5);
}
.card-head{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:14px 18px;
  border-bottom:1px dashed var(--rule);
}
.card-body{padding:18px;}
.card-body p{font-size:15px;line-height:1.75;color:#33302A;}

.panel{
  padding:26px 22px;
  background:var(--green);
  border:1px solid #0E2B24;
  color:#EFE9DB;
}
.panel h2,.panel h3{color:#F4EFE2;}
.panel p{color:rgba(239,233,219,.82);}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid var(--brass-light);
  background:rgba(216,183,120,.12);
  color:var(--brass);
  font-family:var(--font-data);
  font-size:12px;
  font-weight:600;
  line-height:1.5;
  letter-spacing:.06em;
}
.tag-alert{
  border-color:var(--alert);
  background:rgba(212,98,42,.1);
  color:var(--alert);
}

.kpi{
  display:flex;
  flex-direction:column;
  gap:5px;
  padding:14px 16px;
  background:var(--paper-lift);
  border-left:3px solid var(--brass);
}
.kpi-num{
  font-family:var(--font-data);
  font-size:26px;
  font-weight:600;
  line-height:1.2;
  color:var(--green);
}
.kpi-label{
  font-size:13.5px;
  line-height:1.6;
  color:var(--steel);
}

.data-table{
  font-family:var(--font-data);
  font-size:15px;
  line-height:1.6;
  background:var(--paper-lift);
}
.data-table caption{
  padding-bottom:10px;
  text-align:left;
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.08em;
  color:var(--steel);
}
.data-table th{
  padding:11px 14px;
  background:var(--green);
  color:#F4EFE2;
  font-weight:600;
  text-align:left;
  letter-spacing:.06em;
}
.data-table td{
  padding:10px 14px;
  border-bottom:1px solid var(--rule);
  color:var(--ink);
}
.data-table tbody tr:nth-child(even) td{background:rgba(201,191,168,.16);}
.data-table .is-alert{color:var(--alert);font-weight:600;}

.accordion{
  background:var(--paper-lift);
  border:1px solid var(--rule);
}
.accordion-item + .accordion-item{border-top:1px dashed var(--rule);}
.accordion-trigger{
  display:flex;
  width:100%;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:15px 18px;
  font-size:16px;
  font-weight:600;
  line-height:1.5;
  text-align:left;
  color:var(--ink);
  cursor:pointer;
  transition:background .18s ease-out;
}
.accordion-trigger:hover{background:rgba(201,191,168,.18);}
.accordion-trigger::after{
  content:"＋";
  font-family:var(--font-data);
  font-size:15px;
  color:var(--brass);
}
.accordion-trigger[aria-expanded="true"]::after{content:"－";}
.accordion-panel{
  padding:0 18px 18px;
  font-size:15px;
  line-height:1.75;
  color:#3A342C;
}
.accordion-panel[hidden]{display:none;}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-data);
  font-size:13px;
  line-height:1.6;
  color:var(--steel);
}
.breadcrumb a{
  color:var(--green);
  text-decoration:none;
  border-bottom:1px solid var(--brass-light);
}
.breadcrumb a:hover{color:var(--brass);}
.breadcrumb li + li::before{content:"/";margin-right:8px;color:var(--rule);}

.prose{
  max-width:40em;
  font-size:16px;
  line-height:1.75;
  color:#2C2620;
}
.prose h2{margin:28px 0 12px;font-size:22px;}
.prose h3{margin:22px 0 10px;font-size:18px;}
.prose p + p{margin-top:14px;}
.prose ul{display:flex;flex-direction:column;gap:8px;margin-top:12px;}
.prose li{position:relative;padding-left:18px;}
.prose li::before{
  content:"";
  position:absolute;
  left:0;
  top:.7em;
  width:7px;
  height:7px;
  border:1px solid var(--brass);
  border-radius:50%;
}

.grid-2,
.grid-3,
.grid-split{
  display:grid;
  grid-template-columns:1fr;
  gap:22px;
}

.link-more{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:14.5px;
  font-weight:600;
  color:var(--green);
  text-decoration:none;
  border-bottom:1px solid var(--brass-light);
  transition:color .18s ease-out;
}
.link-more::after{
  content:"→";
  font-family:var(--font-data);
  transition:transform .18s ease-out;
}
.link-more:hover{color:var(--brass);}
.link-more:hover::after{transform:translateX(3px);}

.toc{
  display:flex;
  flex-direction:column;
  gap:4px;
  padding-left:12px;
  border-left:2px solid var(--rule);
  font-size:14px;
}
.toc-link{
  display:block;
  margin-left:-14px;
  padding:4px 0 4px 12px;
  border-left:2px solid transparent;
  color:var(--steel);
  text-decoration:none;
  transition:color .2s ease-out,border-color .2s ease-out;
}
.toc-link:hover{color:var(--green);}
.toc-link[aria-current="true"]{
  color:var(--brass);
  border-left-color:var(--brass);
  font-weight:600;
}

/* 图片容器 */
.figure{
  position:relative;
  display:block;
  padding:10px;
  background:var(--paper-lift);
  border:1px solid var(--rule);
  box-shadow:inset 0 0 0 1px rgba(251,247,238,.7), 0 16px 26px -24px rgba(30,26,22,.7);
}
.figure-media{
  position:relative;
  overflow:hidden;
  background:linear-gradient(180deg,#EDE5D4,#E1D8C3);
}
.figure-media img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.78) sepia(.1) contrast(.97);
}
.figure-media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  box-shadow:inset 0 0 0 1px rgba(201,191,168,.85);
  background-image:repeating-linear-gradient(0deg, rgba(30,26,22,.05) 0 1px, transparent 1px 4px);
}
.figure--wide .figure-media{aspect-ratio:16/9;}
.figure--square .figure-media{aspect-ratio:1/1;}
.figure--tall .figure-media{aspect-ratio:4/5;}
.figure-cap{
  display:block;
  padding:10px 2px 2px;
  font-family:var(--font-data);
  font-size:12.5px;
  line-height:1.6;
  letter-spacing:.04em;
  color:var(--steel);
}

/* 显现 */
[data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .45s ease-out,transform .45s ease-out;
}
[data-reveal].is-visible{opacity:1;transform:none;}

/* ============================================================
   平板 ≥ 640px
   ============================================================ */
@media (min-width:640px){
  h1{font-size:38px;}
  .wrap{padding:0 26px;}
  .grid-2{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr));}
  .section{padding:56px 0;}
}

/* ============================================================
   桌面 ≥ 960px：L 形框架成型
   ============================================================ */
@media (min-width:960px){
  body{
    padding-top:var(--top-h);
    padding-left:var(--rail-w);
  }
  .site-header{position:static;}
  .header-rail{
    position:fixed;
    top:0;
    bottom:0;
    right:auto;
    left:0;
    width:var(--rail-w);
    min-height:0;
    flex-direction:column;
    align-items:stretch;
    gap:16px;
    padding:22px 18px 20px;
    overflow:auto;
    border-right:1px solid var(--brass);
    border-bottom:0;
  }
  .header-rail::after{
    content:"";
    position:absolute;
    top:0;
    right:0;
    bottom:0;
    width:6px;
    pointer-events:none;
    background:repeating-linear-gradient(180deg, rgba(216,183,120,.5) 0 1px, transparent 1px 12px);
    opacity:.55;
  }
  .brand-mark{
    align-items:flex-start;
    padding-bottom:16px;
    border-bottom:1px dashed rgba(216,183,120,.4);
  }
  .brand-tag{display:block;}
  .nav-toggle{display:none;}
  .site-nav{
    display:flex;
    position:static;
    flex:1 1 auto;
    gap:14px;
    max-height:none;
    padding:0;
    overflow:visible;
    background:none;
    border:0;
    box-shadow:none;
  }
  .rail-dial{
    display:block;
    margin-top:auto;
    padding-top:14px;
    border-top:1px dashed rgba(216,183,120,.35);
  }
  .dial-scale{
    display:block;
    height:20px;
    border-bottom:1px solid rgba(216,183,120,.4);
    background-image:
      repeating-linear-gradient(90deg, rgba(216,183,120,.7) 0 1px, transparent 1px 9px),
      repeating-linear-gradient(90deg, rgba(216,183,120,.35) 0 1px, transparent 1px 45px);
    background-size:100% 8px, 100% 14px;
    background-repeat:no-repeat, no-repeat;
    background-position:left bottom, left bottom;
  }
  .rail-meta{
    margin:10px 0;
    font-family:var(--font-data);
    font-size:12px;
    line-height:1.7;
    letter-spacing:.04em;
    color:rgba(244,239,226,.7);
  }
  .rail-meta .mono{color:var(--brass-light);}
  .rail-progress{display:none;}

  .topbar{
    position:fixed;
    top:0;
    left:var(--rail-w);
    right:0;
    z-index:50;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:20px;
    height:var(--top-h);
    padding:0 26px;
    background:var(--paper);
    border-bottom:1px solid var(--rule);
    font-family:var(--font-data);
    font-size:12.5px;
    letter-spacing:.06em;
    color:#4A4239;
  }
  .topbar-left .mono{color:var(--brass);font-weight:600;}
  .topbar-mid{color:var(--steel);}
  .topbar-right{color:var(--green);font-weight:600;}

  .section{padding:64px 0;}
  .section-title{font-size:28px;line-height:1.35;}
  .grid-3{grid-template-columns:repeat(3,minmax(0,1fr));}
  .grid-split{grid-template-columns:minmax(0,2fr) minmax(0,1fr);gap:28px;}
  .footer-inner{padding:56px 32px 28px;}
  .to-top{right:28px;bottom:28px;}
}

/* ============================================================
   动效降级
   ============================================================ */
@media (prefers-reduced-motion: reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none;}
  .brand-mark:hover .brand-gear,
  .to-top:hover::before{transform:none;}
}