/* ============================================================
   PA游艺入口 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   页面专属布局请在页面 CSS 中追加，不要覆盖本文件的契约类
   ============================================================ */

:root{
  --bg:#060A12;
  --panel:#0D1522;
  --panel-2:#111B2B;
  --line:#172033;
  --dim:#3A4761;
  --paper:#F3E9DA;
  --ink:#1A1410;
  --cyan:#2BE9E0;
  --amber:#FF9B3D;
  --violet:#7B5CFF;
  --muted:#9AA7BD;
  --text:#E8EEF7;

  --rail-w:72px;
  --shell:1160px;
  --r-sm:3px;
  --r-md:6px;

  --mono:"JetBrains Mono","Noto Sans Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans GB",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;

  --shadow:0 1px 0 rgba(255,255,255,.02), 0 24px 48px -40px rgba(0,0,0,.95);
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%}

body{
  margin:0;
  min-height:100vh;
  background-color:var(--bg);
  background-image:
    radial-gradient(900px 520px at 78% -8%, rgba(123,92,255,.16), transparent 62%),
    radial-gradient(700px 420px at 6% 2%, rgba(43,233,224,.08), transparent 60%),
    linear-gradient(rgba(23,32,51,.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,32,51,.42) 1px, transparent 1px);
  background-size:auto, auto, 100% 96px, 96px 100%;
  color:var(--text);
  font-family:var(--sans);
  font-size:16.5px;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
}

h1,h2,h3,h4,h5,h6{
  margin:0 0 .6em;
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.01em;
  color:var(--text);
}
h1{font-size:clamp(32px,5vw,56px)}
h2{font-size:clamp(24px,3.4vw,38px)}
h3{font-size:clamp(19px,2.2vw,24px);font-weight:700}
h4{font-size:17px;font-weight:700}

p{margin:0 0 1.1em}
p:last-child{margin-bottom:0}

a{color:var(--cyan);text-decoration:none;transition:color .2s var(--ease),border-color .2s var(--ease)}
a:hover{color:var(--amber)}

ul,ol{margin:0 0 1.1em;padding-left:1.3em}
li{margin:.3em 0}

img,svg,video{max-width:100%}
img{border-style:none}

button{font:inherit;color:inherit}

hr{border:0;border-top:1px solid var(--line);margin:32px 0}

::selection{background:rgba(43,233,224,.28);color:#FFFFFF}

:focus{outline:none}
:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:2px;
}

.mono{
  font-family:var(--mono);
  font-variant-ligatures:none;
  letter-spacing:.08em;
}

.dot{
  display:inline-block;
  width:6px;height:6px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(43,233,224,.14);
  flex:0 0 auto;
}

/* ---------- 容器与骨架 ---------- */

.shell{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding-left:clamp(18px,4vw,40px);
  padding-right:clamp(18px,4vw,40px);
}

.page-main{
  display:block;
  padding-bottom:clamp(56px,8vw,110px);
}

.section{
  padding:clamp(40px,6vw,84px) 0;
}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  margin-bottom:clamp(20px,3vw,36px);
  padding-bottom:16px;
  border-bottom:1px solid var(--line);
}

.section-title{
  margin:0;
  font-size:clamp(24px,3.4vw,38px);
  font-weight:800;
  letter-spacing:-.01em;
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin-bottom:12px;
  font-family:var(--mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{
  content:"";
  width:18px;height:1px;
  background:var(--cyan);
}

.lede{
  max-width:62ch;
  font-size:clamp(16px,1.5vw,18.5px);
  color:var(--muted);
  line-height:1.85;
}

.prose{
  max-width:70ch;
  font-size:16.5px;
  line-height:1.85;
  color:#CBD6E6;
}
.prose h2,.prose h3{margin-top:1.8em;color:var(--text)}
.prose strong{color:var(--text);font-weight:600}

.paper{
  background:var(--paper);
  color:var(--ink);
  border:1px solid rgba(26,20,16,.14);
  border-radius:var(--r-sm);
  padding:clamp(24px,4vw,52px);
  box-shadow:var(--shadow);
}
.paper h1,.paper h2,.paper h3,.paper h4{color:var(--ink)}
.paper p,.paper li{color:#3B3027}
.paper .lede{color:#5C4E42}
.paper a{color:#8A3E12;border-bottom:1px solid rgba(138,62,18,.35)}
.paper a:hover{color:#B4520F;border-bottom-color:#B4520F}
.paper code,.paper .mono{color:#7A3A10}
.paper hr{border-top-color:rgba(26,20,16,.16)}

/* ---------- 网格 ---------- */

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2.4vw,28px);
}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

.layout-split{
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);
  gap:clamp(24px,4vw,60px);
  align-items:start;
}
.layout-split--reverse{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr)}
.layout-split--reverse > :first-child{order:2}

.stack{display:flex;flex-direction:column;gap:clamp(20px,3vw,40px)}
.stack-sm{display:flex;flex-direction:column;gap:clamp(10px,1.6vw,18px)}

@media (max-width:900px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 6}
  .layout-split,
  .layout-split--reverse{grid-template-columns:minmax(0,1fr)}
  .layout-split--reverse > :first-child{order:0}
}

/* ---------- 按钮 ---------- */

.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 22px;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--panel);
  color:var(--text);
  font-size:15px;
  font-weight:500;
  line-height:1.3;
  letter-spacing:.01em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),background-color .2s var(--ease);
}
.btn:hover{
  transform:translateY(-2px);
  border-color:var(--cyan);
  color:var(--cyan);
}
.btn--primary{
  border-color:rgba(43,233,224,.5);
  background:linear-gradient(135deg,rgba(43,233,224,.14),rgba(123,92,255,.2));
  color:#EAFEFF;
}
.btn--primary:hover{color:#FFFFFF;border-color:var(--cyan)}
.btn--amber{
  border-color:rgba(255,155,61,.5);
  background:linear-gradient(135deg,rgba(255,155,61,.16),rgba(255,155,61,.04));
  color:#FFD9AE;
}
.btn--amber:hover{color:#FFFFFF;border-color:var(--amber)}
.btn--ghost{background:transparent}
.btn--mono{
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.1em;
}

/* ---------- 面包屑 ---------- */

.breadcrumb{
  padding:clamp(16px,2.4vw,26px) 0 0;
}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--muted);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px;margin:0}
.breadcrumb-item::after{content:"/";color:var(--dim)}
.breadcrumb-item:last-child::after{content:""}
.breadcrumb-item a{color:var(--muted)}
.breadcrumb-item a:hover{color:var(--cyan)}
.breadcrumb-item [aria-current="page"]{color:var(--text)}

/* ---------- 面板 / 卡片 / 标签 ---------- */

.panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  box-shadow:var(--shadow);
}

.card{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:12px;
  padding:clamp(18px,2.4vw,26px);
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  box-shadow:var(--shadow);
  transition:transform .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.card:hover{
  transform:translateY(-2px);
  border-color:var(--cyan);
  background:var(--panel-2);
}
.card-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}
.card-title{
  margin:0;
  font-size:17px;
  font-weight:700;
  letter-spacing:-.005em;
}
.card-title a{color:var(--text)}
.card-title a:hover{color:var(--cyan)}
.card-meta{
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--muted);
}
.card-body{
  font-size:15px;
  line-height:1.8;
  color:var(--muted);
}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--muted);
  background:rgba(6,10,18,.5);
  white-space:nowrap;
}
.tag--cyan{border-color:rgba(43,233,224,.45);color:var(--cyan)}
.tag--amber{border-color:rgba(255,155,61,.45);color:var(--amber)}
.tag--violet{border-color:rgba(123,92,255,.5);color:#B9A7FF}
.tag--muted{color:var(--muted)}

/* ---------- 时间轴 ---------- */

.timeline{
  position:relative;
  margin:0;
  padding:0 0 0 28px;
  list-style:none;
  border-left:1px solid var(--line);
}
.timeline-item{
  position:relative;
  margin:0 0 clamp(22px,3vw,36px);
  padding:0;
}
.timeline-item:last-child{margin-bottom:0}
.timeline-node{
  position:absolute;
  left:calc(-28px - 4px);
  top:8px;
  width:7px;height:7px;
  border-radius:50%;
  background:var(--bg);
  border:1px solid var(--dim);
  transition:background-color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.timeline-item:hover .timeline-node{
  background:var(--cyan);
  border-color:var(--cyan);
  box-shadow:0 0 0 4px rgba(43,233,224,.16);
}
.timeline-date{
  display:block;
  margin-bottom:6px;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--muted);
}
.timeline-body{
  font-size:15.5px;
  line-height:1.8;
  color:#C7D3E3;
}

/* ---------- 数据表 ---------- */

.data-table{
  width:100%;
  border-collapse:collapse;
  font-size:15px;
}
.data-table caption{
  padding-bottom:12px;
  text-align:left;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--muted);
}
.data-table th,
.data-table td{
  padding:13px 14px;
  border-bottom:1px solid var(--line);
  text-align:left;
  vertical-align:top;
}
.data-table th{
  font-family:var(--mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.1em;
  color:var(--muted);
  background:rgba(6,10,18,.55);
}
.data-table tbody tr{transition:background-color .2s var(--ease)}
.data-table tbody tr:hover{background:rgba(43,233,224,.05)}
.data-table .num{
  font-family:var(--mono);
  font-variant-numeric:tabular-nums;
  color:var(--amber);
}
.data-table .is-up{color:var(--cyan)}

/* ---------- 索引路径（技能树式） ---------- */

.path-tree{
  margin:0;
  padding:0;
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:14px;
}
.path-node{
  position:relative;
  padding-left:26px;
}
.path-node::before{
  content:"";
  position:absolute;
  left:4px;top:11px;
  width:11px;height:1px;
  background:linear-gradient(90deg,var(--violet),var(--cyan));
}
.path-node::after{
  content:"";
  position:absolute;
  left:0;top:2px;bottom:-14px;
  width:1px;
  background:var(--line);
}
.path-node:last-child::after{display:none}
.path-link{
  display:inline-flex;
  align-items:baseline;
  gap:10px;
  font-size:15.5px;
  font-weight:500;
  color:var(--text);
}
.path-link:hover{color:var(--cyan)}
.path-link span{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--muted)}

/* ---------- 图片容器（页面阶段放 <img> 用） ---------- */

.figure{
  position:relative;
  display:block;
  margin:0;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--panel);
  overflow:hidden;
  box-shadow:var(--shadow);
}
.figure-media{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 9;
  background-color:#0A1220;
  background-image:
    linear-gradient(rgba(43,233,224,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43,233,224,.07) 1px, transparent 1px);
  background-size:32px 32px;
}
.figure-media img,
.figure-media svg{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.figure--wide .figure-media{aspect-ratio:21 / 9}
.figure--tall .figure-media{aspect-ratio:4 / 5}
.figure--square .figure-media{aspect-ratio:1 / 1}

.figure-caption{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:10px 14px;
  border-top:1px solid var(--line);
  background:rgba(6,10,18,.62);
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:var(--muted);
}
.figure-caption b{color:var(--cyan);font-weight:500}

.figure::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:radial-gradient(120% 100% at 82% 0%, rgba(123,92,255,.16), transparent 62%);
}

/* ---------- 跳转链接 ---------- */

.skip-link{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:200;
  padding:10px 18px;
  background:var(--cyan);
  color:#04202A;
  font-weight:600;
  border-radius:0 0 var(--r-sm) 0;
}
.skip-link:focus{
  left:0;
  color:#04202A;
}

/* ---------- 滚动进度 ---------- */

.scroll-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:2px;
  z-index:90;
  pointer-events:none;
  background:rgba(23,32,51,.6);
}
.scroll-progress-bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 68%,var(--amber));
  transition:width .12s linear;
}
@media (min-width:1024px){
  .scroll-progress{left:var(--rail-w)}
}

/* ---------- 头部 ---------- */

.site-header{
  position:sticky;
  top:0;
  z-index:70;
  background:rgba(6,10,18,.88);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transition:background-color .25s var(--ease);
}

.header-strip{
  border-bottom:1px solid var(--line);
  background:linear-gradient(90deg,rgba(43,233,224,.06),rgba(123,92,255,.07) 58%,transparent);
}
.strip-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  min-height:34px;
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.09em;
  color:var(--muted);
}
.strip-badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:var(--cyan);
  white-space:nowrap;
}
.strip-meta{
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}
.strip-link{
  color:var(--muted);
  border-bottom:1px solid transparent;
  white-space:nowrap;
}
.strip-link:hover{color:var(--amber);border-bottom-color:var(--amber)}

.masthead{
  padding:clamp(18px,3vw,34px) 0 clamp(12px,1.8vw,20px);
  text-align:center;
  transition:padding .25s var(--ease);
}
.masthead-inner{
  display:flex;
  justify-content:center;
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:18px;
  color:var(--text);
  text-decoration:none;
}
.brand:hover{color:var(--text)}
.brand-mark{
  display:grid;
  place-items:center;
  width:52px;height:52px;
  border:1px solid rgba(43,233,224,.4);
  border-radius:var(--r-sm);
  background:linear-gradient(140deg,rgba(43,233,224,.14),rgba(123,92,255,.12));
  color:var(--cyan);
  font-size:17px;
  font-weight:700;
  letter-spacing:.04em;
  transition:width .25s var(--ease),height .25s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.brand:hover .brand-mark{
  border-color:var(--cyan);
  box-shadow:0 0 0 1px rgba(43,233,224,.28);
}
.brand-text{
  display:flex;
  flex-direction:column;
  align-items:flex-start;
  gap:4px;
  text-align:left;
}
.brand-name{
  font-size:clamp(26px,4.2vw,40px);
  font-weight:800;
  line-height:1.05;
  letter-spacing:-.01em;
  transition:font-size .25s var(--ease);
}
.brand-tagline{
  font-size:11.5px;
  letter-spacing:.14em;
  color:var(--muted);
  transition:opacity .2s var(--ease);
}

/* 滚动收缩态 */
.site-header.is-compact .masthead{padding:10px 0}
.site-header.is-compact .brand-name{font-size:20px}
.site-header.is-compact .brand-mark{width:34px;height:34px;font-size:13px}
.site-header.is-compact .brand-tagline{opacity:0;height:0;overflow:hidden}

.header-nav{
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(13,21,34,.72),rgba(6,10,18,.4));
}
.nav-bar{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  min-height:52px;
}
.nav-label{
  position:absolute;
  left:clamp(18px,4vw,40px);
  top:50%;
  transform:translateY(-50%);
  font-size:10.5px;
  letter-spacing:.22em;
  color:var(--dim);
}

.site-nav{width:100%}
.nav-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:center;
  gap:clamp(4px,1.4vw,20px);
  margin:0;
  padding:0;
  list-style:none;
  counter-reset:nav;
}
.nav-item{margin:0}
.nav-link{
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  padding:15px 10px;
  border-bottom:1px solid transparent;
  color:var(--muted);
  font-size:15px;
  font-weight:500;
  line-height:1.2;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.nav-link::before{
  counter-increment:nav;
  content:"0" counter(nav);
  font-family:var(--mono);
  font-size:10.5px;
  letter-spacing:.08em;
  color:var(--dim);
  transition:color .2s var(--ease);
}
.nav-link:hover{
  color:var(--text);
  border-bottom-color:rgba(43,233,224,.5);
}
.nav-link:hover::before{color:var(--cyan)}
.nav-link[aria-current="page"]{
  color:var(--cyan);
  border-bottom-color:var(--cyan);
}
.nav-link[aria-current="page"]::before{color:var(--cyan)}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:9px 14px;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--panel);
  color:var(--text);
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.1em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{
  display:inline-flex;
  flex-direction:column;
  gap:4px;
  width:16px;
}
.nav-toggle-bars i{
  display:block;
  height:1px;
  background:currentColor;
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

@media (max-width:900px){
  .nav-bar{
    flex-wrap:wrap;
    justify-content:space-between;
    padding-top:10px;
    padding-bottom:10px;
    row-gap:0;
  }
  .nav-label{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;
    flex-basis:100%;
    order:3;
    margin-top:8px;
  }
  .site-nav[data-open="true"]{
    display:block;
    animation:navIn .26s var(--ease) both;
  }
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    border-top:1px solid var(--line);
  }
  .nav-item{width:100%}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:14px 4px;
    border-bottom:1px solid var(--line);
  }
  .nav-link:last-child{border-bottom:0}
  .nav-link:hover{background:rgba(43,233,224,.05)}
}

@keyframes navIn{
  from{opacity:0;transform:translateY(-6px)}
  to{opacity:1;transform:none}
}

/* ---------- 左侧快捷轨道 ---------- */

.quick-rail{display:none}

@media (min-width:1024px){
  .quick-rail{
    display:flex;
    position:fixed;
    left:0;top:0;bottom:0;
    width:var(--rail-w);
    z-index:65;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    gap:12px;
    padding:18px 0;
    background:linear-gradient(180deg,rgba(13,21,34,.94),rgba(6,10,18,.97));
    border-right:1px solid var(--line);
  }
  .rail-caption{
    writing-mode:vertical-rl;
    font-size:10px;
    letter-spacing:.28em;
    color:var(--dim);
  }
  .rail-track{
    width:1px;
    height:46px;
    background:linear-gradient(180deg,transparent,var(--line) 20%,var(--cyan),var(--line) 80%,transparent);
  }
  .rail-link{
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:7px;
    width:58px;
    padding:10px 4px;
    border:1px solid transparent;
    border-radius:var(--r-sm);
    color:var(--muted);
    text-align:center;
    transition:transform .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),background-color .2s var(--ease);
  }
  .rail-link:hover{
    transform:translateY(-2px);
    border-color:rgba(43,233,224,.45);
    background:rgba(43,233,224,.05);
    color:var(--cyan);
  }
  .rail-ico{
    display:grid;
    place-items:center;
    width:26px;height:26px;
    border:1px solid var(--line);
    border-radius:2px;
    font-size:12px;
    color:var(--cyan);
  }
  .rail-label{
    font-size:11px;
    line-height:1.3;
    letter-spacing:.02em;
  }
}

/* ---------- 页脚 ---------- */

.site-footer{
  position:relative;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(13,21,34,.92),rgba(6,10,18,.99));
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(43,233,224,.5),rgba(123,92,255,.45),transparent);
}
.footer-inner{padding-top:clamp(34px,5vw,64px)}

.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.35fr);
  gap:clamp(28px,5vw,72px);
  padding-bottom:clamp(26px,4vw,44px);
  border-bottom:1px solid var(--line);
}
.footer-brand{display:flex;flex-direction:column;gap:14px;align-items:flex-start}
.footer-brand-link{
  font-size:clamp(20px,2.4vw,26px);
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--text);
}
.footer-brand-link:hover{color:var(--cyan)}
.footer-note{
  margin:0;
  max-width:34ch;
  font-size:14.5px;
  line-height:1.8;
  color:var(--muted);
}
.footer-status{
  display:inline-flex;
  align-items:center;
  gap:9px;
  padding:6px 11px;
  border:1px solid var(--line);
  border-radius:2px;
  background:rgba(6,10,18,.55);
  font-size:11.5px;
  color:var(--muted);
}

.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,3vw,32px);
}
.footer-col-title{
  margin:0 0 14px;
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.18em;
  color:var(--cyan);
}
.footer-list{
  margin:0;
  padding:0;
  list-style:none;
}
.footer-list li{margin:0 0 9px}
.footer-list li:last-child{margin-bottom:0}
.footer-list a{
  position:relative;
  color:var(--muted);
  font-size:14.5px;
  border-bottom:1px solid transparent;
}
.footer-list a:hover{color:var(--text);border-bottom-color:var(--cyan)}

.footer-contact{
  padding:clamp(20px,3vw,30px) 0;
  border-bottom:1px solid var(--line);
}
.footer-contact-line{
  margin:0 0 8px;
  font-size:12.5px;
  letter-spacing:.08em;
  color:var(--text);
  word-break:break-word;
}
.footer-contact-note{
  margin:0;
  font-size:13.5px;
  color:var(--muted);
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:18px 0 26px;
  font-size:11.5px;
  color:var(--muted);
}
.footer-record{color:var(--muted)}
.footer-copy{color:var(--dim)}

.to-top{
  padding:8px 14px;
  border:1px solid var(--line);
  border-radius:2px;
  background:transparent;
  color:var(--muted);
  font-family:var(--mono);
  font-size:11.5px;
  letter-spacing:.1em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease),transform .2s var(--ease);
}
.to-top:hover{
  transform:translateY(-2px);
  border-color:var(--cyan);
  color:var(--cyan);
}

@media (max-width:900px){
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 18px}
}
@media (max-width:560px){
  .strip-meta{display:none}
  .footer-cols{grid-template-columns:minmax(0,1fr)}
  .footer-bottom{justify-content:flex-start}
}

/* ---------- 滚动渐显 ---------- */

[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
  will-change:opacity,transform;
}
[data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- 无障碍与降级 ---------- */

@media (prefers-reduced-motion: reduce){
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
}