/* ==========================================================================
   凯时平台登录 · /assets/site.css
   共享层：重置 / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ========================================================================== */

:root{
  --void:#060B18;
  --slate:#0F1A33;
  --panel:#141E38;
  --glass:rgba(120,150,200,.10);
  --glass-soft:rgba(120,150,200,.06);
  --line:rgba(120,150,200,.20);
  --line-soft:rgba(120,150,200,.11);
  --cyan:#43F5DC;
  --amber:#FF9A3C;
  --silver-a:#C9D3E0;
  --silver-b:#8894A8;
  --violet:#B39CFF;
  --moss:#6FBF8B;
  --clay:#C2734A;
  --rock:#6C7889;
  --bone:#F4F1EA;
  --ink-2:#9BA8BC;
  --ink-3:#C4CEDA;

  --mono:ui-monospace,"JetBrains Mono","IBM Plex Mono",Menlo,Consolas,monospace;
  --sans:system-ui,-apple-system,"Segoe UI","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;

  --shell:1360px;
  --gap:clamp(18px,2.2vw,32px);
  --radius:14px;
  --radius-sm:10px;
  --header-h:96px;
  --header-h-sm:62px;
}

/* ---------- reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{
  background:var(--void);
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:120px;
}
body{
  margin:0;
  background:transparent;
  color:var(--bone);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg,video{ max-width:100%; }
img{ height:auto; display:block; }
button{ font:inherit; color:inherit; }
ul,ol{ margin:0 0 1.1em; padding-left:1.25em; }
hr{ border:0; border-top:1px solid var(--line-soft); margin:2.4em 0; }
table{ border-collapse:collapse; width:100%; }
:focus-visible{ outline:2px solid var(--cyan); outline-offset:3px; border-radius:3px; }

/* 背景点阵 / 波形层 */
body::before{
  content:"";
  position:fixed;
  inset:-12%;
  z-index:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(114deg, rgba(67,245,220,.030) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(-114deg, rgba(179,156,255,.026) 0 1px, transparent 1px 138px);
  animation:site-drift 16s ease-in-out infinite alternate;
}
@keyframes site-drift{
  from{ transform:translate3d(0,0,0); }
  to{ transform:translate3d(-30px,14px,0); }
}
body > *{ position:relative; z-index:1; }
body.nav-open{ overflow:hidden; }

/* ---------- 排版 ---------- */
h1,h2,h3,h4,h5{ margin:0 0 .55em; line-height:1.2; font-weight:700; letter-spacing:.005em; }
p{ margin:0 0 1.1em; }
a{ color:var(--cyan); text-decoration:none; }
a:hover{ text-decoration:underline; text-underline-offset:4px; }

.display{
  font-family:var(--mono);
  font-weight:700;
  font-size:clamp(48px,9vw,132px);
  line-height:.92;
  letter-spacing:.01em;
  margin:0 0 .18em;
  color:var(--bone);
}
h1,.h1{ font-size:clamp(28px,3.2vw,46px); letter-spacing:.01em; }
h2,.h2{ font-size:clamp(22px,2.1vw,30px); }
h3,.h3{ font-size:clamp(17px,1.35vw,21px); }
.lead{ font-size:1.06rem; line-height:1.72; color:var(--ink-3); max-width:58ch; }
.note{
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--rock);
  line-height:1.7;
}
.mono{ font-family:var(--mono); font-weight:600; letter-spacing:.02em; }
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  font-family:var(--mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--rock);
  margin:0 0 14px;
}
.eyebrow::before{
  content:"";
  width:20px; height:2px;
  background:var(--cyan);
  display:inline-block;
}
.prose{ max-width:70ch; color:var(--ink-3); }
.prose h2,.prose h3{ color:var(--bone); margin-top:1.9em; }
.prose strong{ color:var(--bone); }
.prose code{
  font-family:var(--mono); font-size:.9em;
  background:var(--glass); border:1px solid var(--line-soft);
  border-radius:5px; padding:.12em .42em; color:var(--cyan);
}
.stack > * + *{ margin-top:1.05em; }
.section-head{
  display:flex; flex-wrap:wrap; align-items:baseline;
  gap:10px 22px; margin-bottom:clamp(20px,3vw,38px);
}
.section-head h2{ margin:0; }
.tag{
  font-family:var(--mono); font-size:11.5px; letter-spacing:.1em;
  border:1px solid var(--line); border-radius:999px;
  padding:.24em .72em; color:var(--ink-2);
}

/* ---------- 布局 ---------- */
.wrap{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding:0 clamp(16px,3vw,40px);
}
.wrap--narrow{ max-width:860px; }
.section{ padding:clamp(46px,7vw,104px) 0; }
.section--tight{ padding:clamp(28px,4vw,56px) 0; }
.grid{ display:grid; gap:var(--gap); }
.grid--12{ grid-template-columns:repeat(12,minmax(0,1fr)); }
.col-rail,.col-main,.col-side,.col-half,.col-wide{ grid-column:1 / -1; min-width:0; }
@media (min-width:960px){
  .col-rail{ grid-column:span 3; }
  .col-main{ grid-column:span 6; }
  .col-side{ grid-column:span 3; }
  .col-half{ grid-column:span 6; }
  .col-wide{ grid-column:span 12; }
}
.dual{ display:grid; grid-template-columns:1fr; gap:var(--gap); }
@media (min-width:820px){ .dual{ grid-template-columns:1fr 1fr; } }

/* ---------- 材质 ---------- */
.glass{
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--radius);
  -webkit-backdrop-filter:blur(12px) saturate(140%);
  backdrop-filter:blur(12px) saturate(140%);
}
.panel{
  background:var(--panel);
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  padding:clamp(18px,2.2vw,28px);
}
.panel--flush{ padding:0; overflow:hidden; }

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.6em;
  padding:.78em 1.3em;
  border-radius:999px;
  border:1px solid var(--line);
  background:var(--glass);
  color:var(--bone);
  font-family:var(--mono);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  text-decoration:none;
  cursor:pointer;
  transition:background .24s ease, border-color .24s ease, color .24s ease, transform .24s ease;
}
.btn:hover{ text-decoration:none; border-color:rgba(67,245,220,.55); background:rgba(67,245,220,.10); color:#EAFFF9; }
.btn:active{ transform:translateY(1px); }
.btn--amber{ border-color:rgba(255,154,60,.5); background:rgba(255,154,60,.10); color:#FFC794; }
.btn--amber:hover{ background:rgba(255,154,60,.20); border-color:rgba(255,154,60,.85); color:#FFE1C4; }
.btn--silver{
  border-color:rgba(201,211,224,.34);
  background:linear-gradient(180deg, rgba(201,211,224,.16), rgba(136,148,168,.07));
  color:#DCE4EE;
}
.btn--silver:hover{ background:linear-gradient(180deg, rgba(201,211,224,.26), rgba(136,148,168,.12)); border-color:rgba(201,211,224,.6); color:#F2F6FB; }
.btn--ghost{ background:transparent; }
.btn--block{ width:100%; }

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex; flex-wrap:wrap; align-items:center; gap:.55em;
  font-family:var(--mono); font-size:12.5px; letter-spacing:.05em;
  color:var(--rock); padding:0; margin:0 0 clamp(20px,3vw,34px); list-style:none;
}
.breadcrumb li{ display:flex; align-items:center; gap:.55em; }
.breadcrumb li + li::before{ content:"/"; color:rgba(108,120,137,.7); }
.breadcrumb a{ color:var(--rock); text-decoration:none; }
.breadcrumb a:hover{ color:var(--cyan); text-decoration:none; }
.breadcrumb [aria-current="page"]{ color:var(--ink-2); }

/* ---------- 索引窄栏 ---------- */
.rail{ position:relative; padding-left:18px; }
.rail::before{
  content:"";
  position:absolute; left:0; top:4px; bottom:4px; width:1px;
  background:linear-gradient(180deg, rgba(67,245,220,.55), rgba(120,150,200,.06));
}
.rail__title{
  font-family:var(--mono); font-size:11.5px; font-weight:700;
  letter-spacing:.18em; text-transform:uppercase;
  color:var(--rock); margin:0 0 14px;
}
.rail__list{ list-style:none; margin:0; padding:0; }
.rail__link{
  position:relative;
  display:block;
  padding:7px 0 7px 14px;
  font-size:14px;
  color:var(--ink-2);
  text-decoration:none;
  line-height:1.5;
}
.rail__link::before{
  content:"";
  position:absolute; left:0; top:50%; transform:translateY(-50%);
  width:0; height:2px; background:var(--cyan);
  transition:width .26s ease;
}
.rail__link:hover{ color:var(--bone); text-decoration:none; }
.rail__link.is-active{ color:var(--bone); }
.rail__link.is-active::before{ width:9px; }

/* ---------- 数据条 ---------- */
.data-strip{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(140px,1fr));
  gap:1px;
  background:var(--line-soft);
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  overflow:hidden;
}
.data-strip__cell{ background:var(--slate); padding:18px 20px; }
.data-strip__num{
  display:block;
  font-family:var(--mono); font-weight:700;
  font-size:clamp(22px,2.6vw,34px); line-height:1.1;
  letter-spacing:.02em; color:var(--cyan);
}
.data-strip__label{
  display:block; margin-top:6px;
  font-family:var(--mono); font-size:12px; letter-spacing:.08em;
  color:var(--rock);
}

/* ---------- 切片视觉带 ---------- */
.slice-band{
  position:relative;
  height:clamp(84px,13vw,168px);
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid var(--line-soft);
  background:linear-gradient(122deg,#0A1226 0%,#101C38 58%,#0A1226 100%);
}
.slice-band::before{
  content:"";
  position:absolute; inset:0;
  background:repeating-linear-gradient(90deg, rgba(67,245,220,.30) 0 2px, transparent 2px 48px);
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 45%,transparent);
  mask-image:linear-gradient(180deg,transparent,#000 45%,transparent);
}
.slice-band::after{
  content:"";
  position:absolute; left:0; right:0; top:50%; height:1px;
  background:linear-gradient(90deg,transparent, rgba(255,154,60,.65) 35%, rgba(201,211,224,.5) 70%, transparent);
}

/* ---------- 通道对照卡 ---------- */
.channel{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
  background:var(--panel);
  padding:clamp(18px,2.2vw,28px);
}
.channel::before{ content:""; position:absolute; inset:0 0 auto; height:4px; }
.channel--latest::before{ background:var(--amber); }
.channel--apple::before{ background:linear-gradient(90deg,var(--silver-a),var(--silver-b)); }
.channel__head{
  display:flex; flex-wrap:wrap; align-items:baseline; justify-content:space-between;
  gap:10px 16px; margin-bottom:6px;
}
.channel__name{
  margin:0;
  font-family:var(--mono); font-weight:700;
  font-size:clamp(16px,1.7vw,21px); letter-spacing:.03em;
}
.channel--latest .channel__name{ color:var(--amber); }
.channel--apple .channel__name{ color:var(--silver-a); }
.channel__ver{
  font-family:var(--mono); font-size:13px; letter-spacing:.06em; color:var(--rock);
}
.channel__badge{
  font-family:var(--mono); font-size:11px; font-weight:700;
  letter-spacing:.12em; text-transform:uppercase;
  border:1px solid currentColor; border-radius:999px;
  padding:.24em .7em;
}
.channel--latest .channel__badge{ color:var(--amber); }
.channel--apple .channel__badge{ color:var(--silver-b); }
.channel__steps{ counter-reset:step; list-style:none; margin:16px 0 0; padding:0; }
.channel__steps li{
  counter-increment:step;
  position:relative;
  padding-left:36px;
  margin-bottom:12px;
  font-size:15px;
  line-height:1.65;
  color:var(--ink-3);
}
.channel__steps li::before{
  content:counter(step,decimal-leading-zero);
  position:absolute; left:0; top:2px;
  font-family:var(--mono); font-size:12px; font-weight:700; letter-spacing:.05em;
}
.channel--latest .channel__steps li::before{ color:var(--amber); }
.channel--apple .channel__steps li::before{ color:var(--silver-a); }

/* ---------- 时间轴 ---------- */
.timeline{ list-style:none; margin:0; padding:0; }
.timeline__item{
  display:grid;
  grid-template-columns:78px 1px minmax(0,1fr);
  gap:0 18px;
  padding:16px 0;
  border-bottom:1px solid var(--line-soft);
}
.timeline__time{
  font-family:var(--mono); font-size:12px; letter-spacing:.03em;
  color:var(--rock); padding-top:4px;
}
.timeline__line{ position:relative; background:rgba(120,150,200,.22); }
.timeline__line::before{
  content:"";
  position:absolute; left:-3px; top:8px;
  width:7px; height:7px; border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(67,245,220,.14);
}
.timeline__item[data-mark="fav"] .timeline__line::before{ background:var(--violet); box-shadow:0 0 0 3px rgba(179,156,255,.16); }
.timeline__body{ min-width:0; padding-top:1px; }
.timeline__title{
  margin:0 0 4px;
  font-family:var(--mono); font-size:14.5px; font-weight:700;
  letter-spacing:.02em; color:var(--bone);
}
.timeline__meta{ margin:0; font-size:14px; color:var(--ink-2); }
@media (max-width:560px){
  .timeline__item{ grid-template-columns:64px 1px minmax(0,1fr); gap:0 12px; }
}

/* ---------- 折叠问答 ---------- */
.faq{ border-top:1px solid var(--line-soft); }
.faq__item{ border-bottom:1px solid var(--line-soft); }
.faq__q{
  position:relative;
  display:block; width:100%;
  text-align:left;
  background:none; border:0;
  color:var(--bone);
  font-family:inherit; font-size:16px; font-weight:600;
  padding:18px 46px 18px 0;
  cursor:pointer;
}
.faq__q::after{
  content:"+";
  position:absolute; right:10px; top:50%; transform:translateY(-50%);
  font-family:var(--mono); font-size:18px; font-weight:700;
  color:var(--cyan);
}
.faq__q[aria-expanded="true"]{ color:#EAFFF9; }
.faq__q[aria-expanded="true"]::after{ content:"–"; color:var(--amber); }
.faq__a{ display:none; padding:0 0 20px; }
.faq__item.is-open .faq__a{ display:block; }
.faq__a p:last-child{ margin-bottom:0; }
.faq__a{ color:var(--ink-3); font-size:15.5px; }

/* ---------- 标签筛选 ---------- */
.chips{ display:flex; flex-wrap:wrap; gap:8px; list-style:none; margin:0 0 22px; padding:0; }
.chip{
  font-family:var(--mono); font-size:12.5px; font-weight:600;
  letter-spacing:.04em;
  padding:.44em .95em;
  border-radius:999px;
  border:1px solid var(--line);
  background:transparent;
  color:var(--ink-2);
  cursor:pointer;
  transition:background .2s ease, border-color .2s ease, color .2s ease;
}
.chip:hover{ color:var(--bone); border-color:rgba(67,245,220,.4); }
.chip[aria-pressed="true"]{
  color:var(--cyan);
  border-color:rgba(67,245,220,.55);
  background:rgba(67,245,220,.12);
}

/* ---------- 收藏 ---------- */
.favorite{
  display:inline-flex; align-items:center; gap:.55em;
  border:1px solid var(--line); border-radius:999px;
  background:var(--glass); color:var(--ink-2);
  font-family:var(--mono); font-size:12.5px; font-weight:600; letter-spacing:.05em;
  padding:.5em 1em; cursor:pointer;
  position:relative;
  transition:color .22s ease, border-color .22s ease, background .22s ease;
}
.favorite__mark{ width:11px; height:14px; border:2px solid currentColor; border-radius:2px 2px 4px 4px; position:relative; }
.favorite__mark::after{
  content:""; position:absolute; left:50%; bottom:-4px; transform:translateX(-50%);
  width:0; height:0; border-left:5px solid transparent; border-right:5px solid transparent;
  border-top:5px solid currentColor;
}
.favorite[aria-pressed="true"]{
  color:var(--violet);
  border-color:rgba(179,156,255,.55);
  background:rgba(179,156,255,.12);
}
.favorite.is-pulse::before{
  content:"";
  position:absolute; left:12px; right:12px; bottom:-7px; height:2px;
  background:var(--violet);
  animation:fav-tick .7s ease forwards;
}
@keyframes fav-tick{
  from{ transform:scaleX(0); transform-origin:left; opacity:1; }
  to{ transform:scaleX(1); transform-origin:left; opacity:0; }
}
.fav-count{ font-family:var(--mono); color:var(--violet); font-weight:700; }

/* ---------- 媒体容器 ---------- */
.media{
  position:relative;
  display:block;
  width:100%;
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid var(--line-soft);
  background:linear-gradient(140deg,#0B1428,#101C38 62%,#0A1226);
}
.media img,.media svg,.media video{ display:block; width:100%; height:100%; object-fit:cover; }
.media--16x9{ aspect-ratio:16 / 9; }
.media--4x3{ aspect-ratio:4 / 3; }
.media--square{ aspect-ratio:1 / 1; }
.media--slice{ aspect-ratio:21 / 6; }
.media__placeholder{
  position:absolute; inset:0;
  display:grid; place-items:center;
  font-family:var(--mono); font-size:12px; letter-spacing:.16em;
  color:rgba(120,150,200,.55);
  background-image:repeating-linear-gradient(45deg, rgba(120,150,200,.05) 0 2px, transparent 2px 12px);
}
.media__caption{
  display:block;
  margin-top:10px;
  font-family:var(--mono); font-size:12px; letter-spacing:.04em;
  color:var(--rock);
}

/* ---------- 显现 / 返回顶部 ---------- */
[data-reveal]{ opacity:0; transform:translateY(16px); transition:opacity .55s ease, transform .55s ease; }
[data-reveal].is-in{ opacity:1; transform:none; }

.back-top{
  position:fixed;
  right:clamp(14px,2.4vw,32px);
  bottom:clamp(14px,2.4vw,32px);
  z-index:55;
  width:46px; height:46px;
  display:grid; place-items:center;
  border-radius:50%;
  border:1px solid var(--line);
  background:rgba(20,30,56,.88);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  color:var(--bone); cursor:pointer;
  opacity:0; visibility:hidden;
  transition:opacity .3s ease, visibility .3s ease, border-color .3s ease, color .3s ease;
}
.back-top.is-visible{ opacity:1; visibility:visible; }
.back-top:hover{ border-color:rgba(67,245,220,.6); color:var(--cyan); }
.back-top span{ font-family:var(--mono); font-size:15px; line-height:1; }

/* ==========================================================================
   头部
   ========================================================================== */
.skip-link{
  position:absolute; left:-9999px; top:0; z-index:200;
  background:var(--cyan); color:#04140F;
  font-family:var(--mono); font-size:13px; font-weight:700;
  padding:11px 20px;
  border-radius:0 0 var(--radius-sm) 0;
  text-decoration:none;
}
.skip-link:focus{ left:0; }

.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:linear-gradient(180deg, rgba(6,11,24,.94), rgba(6,11,24,.72));
  border-bottom:1px solid var(--line-soft);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  backdrop-filter:blur(16px) saturate(140%);
}
.header-shell{
  max-width:var(--shell);
  margin:0 auto;
  padding:0 clamp(16px,3vw,40px);
  min-height:var(--header-h);
  display:flex;
  align-items:center;
  gap:clamp(14px,3vw,48px);
  transition:min-height .34s ease;
}
.site-header.is-condensed .header-shell{ min-height:var(--header-h-sm); }

/* 品牌 */
.brand{ flex:0 0 auto; min-width:0; }
.brand__link{
  display:flex; align-items:center; gap:12px;
  color:var(--bone); text-decoration:none;
}
.brand__link:hover{ text-decoration:none; }
.brand__mark{
  position:relative;
  display:block;
  flex:0 0 auto;
  width:28px; height:28px;
  border-radius:9px;
  background:var(--glass);
  border:1px solid var(--line);
}
.brand__mark i{ position:absolute; left:7px; width:13px; height:2px; border-radius:2px; }
.brand__mark i:first-child{ top:9px; background:var(--amber); }
.brand__mark i:last-child{ top:16px; background:linear-gradient(90deg,var(--silver-a),var(--silver-b)); }
.brand__text{ display:flex; flex-direction:column; line-height:1.15; min-width:0; }
.brand__name{ font-size:16px; font-weight:700; letter-spacing:.05em; white-space:nowrap; }
.brand__sub{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.15em;
  color:var(--rock); margin-top:4px; white-space:nowrap;
  transition:opacity .28s ease, max-height .28s ease;
  max-height:16px;
}
.site-header.is-condensed .brand__sub{ opacity:0; max-height:0; margin-top:0; }

/* 中部留白 */
.header-void{
  flex:1 1 auto;
  min-width:24px;
  align-self:stretch;
  background-image:radial-gradient(rgba(120,150,200,.34) 1px, transparent 1px);
  background-size:9px 9px;
  background-position:center;
  opacity:.55;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 20%,#000 80%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 20%,#000 80%,transparent);
}

/* 导航 */
.nav{ display:flex; align-items:center; flex:0 0 auto; }
.nav__list{
  display:flex; align-items:center;
  gap:clamp(4px,1.7vw,28px);
  list-style:none; margin:0; padding:0;
}
.nav__item{ display:block; }
.nav__link{
  position:relative;
  display:block;
  padding:9px 2px;
  font-family:var(--mono);
  font-size:clamp(12.5px,1.05vw,13.5px);
  font-weight:600;
  letter-spacing:.06em;
  color:var(--ink-2);
  white-space:nowrap;
  text-decoration:none;
  transition:color .22s ease;
}
.nav__link::after{
  content:"";
  position:absolute; left:0; right:0; bottom:2px; height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .28s ease;
}
.nav__link:hover{ color:var(--bone); text-decoration:none; }
.nav__link:hover::after{ transform:scaleX(.5); }
.nav__link[aria-current="page"]{ color:var(--bone); }
.nav__link[aria-current="page"]::after{ transform:scaleX(1); }
.nav__foot{
  display:none;
  margin:0;
  font-family:var(--mono); font-size:12px; letter-spacing:.06em;
  color:var(--rock);
}

/* 移动按钮 */
.nav-toggle{
  display:none;
  margin-left:auto;
  align-items:center;
  gap:9px;
  padding:8px 14px;
  border-radius:999px;
  border:1px solid var(--line);
  background:var(--glass);
  color:var(--bone);
  font-family:var(--mono);
  font-size:12.5px;
  font-weight:600;
  letter-spacing:.1em;
  cursor:pointer;
}
.nav-toggle__bars{
  position:relative;
  display:block;
  width:16px; height:2px;
  background:var(--cyan);
  transition:background .22s ease;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute; left:0;
  width:16px; height:2px;
  background:var(--cyan);
  transition:transform .26s ease, top .26s ease;
}
.nav-toggle__bars::before{ top:-5px; }
.nav-toggle__bars::after{ top:5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{ background:transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{ top:0; transform:rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{ top:0; transform:rotate(-45deg); }

/* 阅读进度 */
.scroll-progress{
  position:absolute;
  left:0; right:0; bottom:-1px;
  height:2px;
  background:rgba(120,150,200,.14);
}
.scroll-progress > span{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
  transition:width .12s linear;
}

@media (max-width:900px){
  .header-void{ display:none; }
  .nav-toggle{ display:inline-flex; }
  .nav{
    position:absolute;
    top:100%; left:0; right:0;
    flex-direction:column;
    align-items:stretch;
    padding:8px clamp(16px,4vw,28px) 22px;
    background:#0A1428;
    border-bottom:1px solid var(--line);
    box-shadow:0 24px 48px rgba(2,5,14,.72);
    max-height:calc(100vh - var(--header-h-sm));
    overflow-y:auto;
    visibility:hidden;
    opacity:0;
    transform:translateY(-10px);
    pointer-events:none;
    transition:opacity .26s ease, transform .26s ease, visibility .26s ease;
  }
  .nav[data-open="true"]{
    visibility:visible;
    opacity:1;
    transform:translateY(0);
    pointer-events:auto;
  }
  .nav__list{ flex-direction:column; align-items:stretch; gap:0; }
  .nav__link{
    font-size:15px;
    padding:15px 0;
    border-bottom:1px solid var(--line-soft);
    white-space:normal;
  }
  .nav__link::after{ display:none; }
  .nav__link[aria-current="page"]{ color:var(--cyan); }
  .nav__foot{ display:block; margin-top:20px; }
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:clamp(48px,7vw,104px);
  background:#04070F;
  border-top:1px solid var(--line-soft);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute; inset:0;
  pointer-events:none;
  background:
    repeating-linear-gradient(116deg, rgba(67,245,220,.045) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(-116deg, rgba(179,156,255,.035) 0 1px, transparent 1px 128px);
}
.footer-shell{
  position:relative;
  max-width:var(--shell);
  margin:0 auto;
  padding:clamp(40px,5vw,76px) clamp(16px,3vw,40px) 30px;
}
.footer-routes{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(24px,3vw,44px);
}
@media (min-width:760px){
  .footer-routes{ grid-template-columns:repeat(3,minmax(0,1fr)); }
}
.foot-col{ min-width:0; }
.foot-col__title{
  margin:0 0 14px;
  font-family:var(--mono); font-size:12px; font-weight:700;
  letter-spacing:.18em; text-transform:uppercase;
  color:var(--rock);
}
.foot-col__link{
  display:inline-block;
  font-size:17px;
  color:var(--bone);
  text-decoration:none;
  padding-bottom:3px;
  border-bottom:1px solid rgba(67,245,220,.35);
  transition:color .22s ease, border-color .22s ease;
}
.foot-col__link:hover{ color:var(--cyan); border-color:var(--cyan); text-decoration:none; }
.foot-col__state{
  margin:14px 0 0;
  font-family:var(--mono); font-size:12px; letter-spacing:.04em;
  color:var(--rock);
}
.footer-legal{
  display:flex; flex-wrap:wrap;
  gap:10px 28px;
  margin-top:clamp(30px,4vw,52px);
  padding:clamp(20px,3vw,30px) 0;
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
}
.footer-legal a{
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.05em;
  color:var(--ink-2);
  text-decoration:none;
}
.footer-legal a:hover{ color:var(--cyan); text-decoration:none; }
.footer-meta{ padding-top:clamp(20px,3vw,30px); }
.footer-meta__row{
  display:flex; flex-wrap:wrap;
  gap:8px 26px;
  margin:0 0 12px;
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.02em;
  color:var(--rock);
}
.footer-meta__row b{ color:#AEBACB; font-weight:600; }
.footer-meta__note{
  margin:0;
  font-size:12.5px;
  line-height:1.7;
  color:#5C6779;
  max-width:70ch;
}
.footer-brandline{
  display:flex; flex-wrap:wrap; justify-content:space-between;
  gap:8px 24px;
  margin:26px 0 0;
  padding-top:18px;
  border-top:1px solid rgba(120,150,200,.10);
  font-family:var(--mono);
  font-size:12.5px;
  letter-spacing:.02em;
  color:#5C6779;
}

/* ---------- 无障碍与减弱动效 ---------- */
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html{ scroll-behavior:auto; }
  body::before{ animation:none; }
  [data-reveal]{ opacity:1 !important; transform:none !important; }
}

@media print{
  .site-header,.site-footer,.back-top,.scroll-progress{ display:none !important; }
}