:root{
  --ink:#000;
  --paper:#fff;
  --line:#000;
  --hair:#e3e3e3;
  --dim:#5c5c5c;
  --rail:96px;
  --bar:64px;
  --ease:cubic-bezier(.2,.7,.2,1);
}

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

html{
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"JetBrains Mono","PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  font-size:17px;
  line-height:1.78;
  letter-spacing:.005em;
  overflow-x:hidden;
  padding-left:var(--rail);
  -webkit-font-smoothing:antialiased;
}

h1,h2,.brand-name,.foot-cta h2{
  font-family:"Orbitron","JetBrains Mono","PingFang SC","Microsoft YaHei",sans-serif;
  font-weight:900;
  letter-spacing:.01em;
}

a{color:inherit}

svg{display:block}

/* ---------- 左侧固定竖排 ---------- */
.rail{
  position:fixed;
  top:0;
  left:0;
  bottom:0;
  width:var(--rail);
  z-index:90;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:space-between;
  padding:22px 0 18px;
  background:var(--paper);
  color:var(--ink);
  border-right:1px solid var(--line);
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
}

.brand{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:10px;
  text-decoration:none;
  color:inherit;
  padding:6px;
  min-height:44px;
}

.brand-mark{width:26px;height:26px;color:currentColor}

.brand-name{
  writing-mode:vertical-rl;
  font-size:16px;
  line-height:1.1;
  letter-spacing:.22em;
  text-transform:uppercase;
}

.burger{
  appearance:none;
  border:1px solid currentColor;
  background:transparent;
  color:inherit;
  border-radius:28px;
  width:52px;
  min-height:52px;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:6px;
  cursor:pointer;
  font-family:inherit;
  font-size:12px;
  letter-spacing:.08em;
  padding:8px 0;
  transition:background .22s var(--ease),color .22s var(--ease),transform .22s var(--ease);
}

.burger:hover{transform:translateY(-2px)}

.burger-bar,
.burger-bar::before{
  display:block;
  width:18px;
  height:1.5px;
  background:currentColor;
  content:"";
  transition:transform .22s var(--ease);
}

.burger-bar::before{transform:translateY(-5px)}

body.menu-open .burger{background:var(--ink);color:var(--paper);border-color:var(--paper)}

.rail-cta{
  position:fixed;
  top:0;
  right:0;
  z-index:55;
  display:inline-flex;
  align-items:center;
  min-height:52px;
  padding:12px 22px;
  border:1px solid var(--line);
  border-top:0;
  border-right:0;
  border-bottom-left-radius:28px;
  background:var(--ink);
  color:var(--paper);
  text-decoration:none;
  font-size:16px;
  letter-spacing:.06em;
  transition:background .22s var(--ease),color .22s var(--ease);
}

.rail-cta:hover{background:var(--paper);color:var(--ink)}

/* ---------- 全屏遮罩菜单 ---------- */
.menu{
  position:fixed;
  inset:0;
  z-index:80;
  background:var(--ink);
  color:var(--paper);
  display:flex;
  align-items:center;
  padding:96px clamp(24px,8vw,140px);
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transition:opacity .24s var(--ease),visibility .24s var(--ease);
}

.menu.open{opacity:1;visibility:visible;pointer-events:auto}

.menu p{
  margin:0;
  display:grid;
  gap:.1rem;
  width:100%;
  max-width:820px;
}

.menu a{
  display:flex;
  align-items:baseline;
  gap:1rem;
  padding:.55rem 0;
  min-height:52px;
  color:var(--paper);
  text-decoration:none;
  font-family:"Orbitron","JetBrains Mono","PingFang SC",sans-serif;
  font-weight:700;
  font-size:clamp(21px,3.4vw,40px);
  line-height:1.2;
  border-bottom:1px solid rgba(255,255,255,.22);
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}

.menu a:hover{transform:translateX(10px)}

.menu .idx{
  font-family:"JetBrains Mono",monospace;
  font-size:13px;
  font-weight:400;
  letter-spacing:.14em;
  opacity:.6;
  min-width:2.2em;
}

body.menu-open .rail{background:var(--ink);color:var(--paper);border-color:rgba(255,255,255,.3)}
body.menu-open .rail-cta{background:var(--paper);color:var(--ink);border-color:var(--paper)}

/* ---------- 主体网格 ---------- */
main{
  display:grid;
  grid-template-columns:minmax(0,1fr) 296px;
  max-width:1440px;
  margin:0 auto;
  align-items:start;
}

article{
  min-width:0;
  padding:clamp(28px,4vw,56px) clamp(20px,4vw,64px) clamp(48px,6vw,88px);
}

.hero{
  min-height:70vh;
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  align-items:center;
  gap:clamp(18px,4vw,52px);
  padding:clamp(24px,5vw,64px) 0 clamp(28px,4vw,52px);
  border-bottom:1px solid var(--line);
}

.hero-mark{
  width:clamp(64px,10vw,132px);
  height:auto;
  color:var(--ink);
  will-change:transform;
}

.hero-text{text-align:right;justify-self:stretch}

h1{
  margin:0 0 1.1rem;
  font-size:clamp(26px,4.6vw,58px);
  line-height:1.16;
  word-break:break-word;
}

.lead{
  margin:0 0 0 auto;
  max-width:44ch;
  font-size:clamp(16px,1.5vw,19px);
  line-height:1.75;
  color:var(--dim);
}

/* ---------- 正文 ---------- */
.content-block{padding-top:clamp(24px,4vw,48px)}

.content-block div[id]{
  scroll-margin-top:96px;
  padding:clamp(28px,4vw,52px) 0;
  border-bottom:1px solid var(--hair);
}

.content-block div[id]:last-child{border-bottom:0}

.content-block h2{
  margin:0 0 .7em;
  font-size:clamp(21px,2.6vw,31px);
  line-height:1.3;
}

.content-block h3{
  margin:1.6em 0 .5em;
  font-size:clamp(18px,2vw,22px);
  line-height:1.4;
}

.content-block p{margin:0 0 1.1em;max-width:66ch}

.content-block ul,
.content-block ol{margin:0 0 1.2em;padding-left:1.3em;max-width:66ch}

.content-block li{margin:.35em 0}

.content-block a{
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}

.content-block a:hover{background:var(--ink);color:var(--paper);text-decoration:none}

.content-block strong{font-weight:700}

.content-block blockquote{
  margin:1.4em 0;
  padding:18px 22px;
  border:1px solid var(--line);
  border-radius:28px;
  max-width:66ch;
}

.content-block blockquote p:last-child{margin-bottom:0}

.content-block figure{margin:1.5em 0}

.content-block img{
  max-width:100%;
  height:auto;
  border:1px solid var(--line);
  border-radius:28px;
  display:block;
}

.content-block figcaption{
  margin-top:.5em;
  font-size:16px;
  color:var(--dim);
}

.content-block table{
  width:100%;
  border-collapse:collapse;
  margin:0 0 1.3em;
  font-size:16px;
}

.content-block th,
.content-block td{
  border:1px solid var(--hair);
  padding:10px 12px;
  text-align:left;
  vertical-align:top;
}

.content-block th{background:#f4f4f4;font-weight:500}

.content-block code{
  font-family:"JetBrains Mono",monospace;
  font-size:.92em;
  border:1px solid var(--hair);
  padding:.1em .35em;
}

/* ---------- 右侧边栏 ---------- */
.side{
  border-left:1px solid var(--line);
  padding:clamp(28px,4vw,56px) 22px;
  position:sticky;
  top:72px;
  align-self:start;
}

.aside-card{
  border:1px solid var(--line);
  border-radius:28px;
  padding:22px 20px;
}

.side h2{
  margin:0 0 .35em;
  font-size:19px;
  line-height:1.3;
}

.side .subtitle{
  margin:0 0 1.1em;
  font-size:16px;
  color:var(--dim);
  line-height:1.5;
}

.toc{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
}

.toc a{
  display:flex;
  align-items:center;
  gap:.6em;
  min-height:40px;
  padding:.25rem 0;
  text-decoration:none;
  font-size:16px;
  line-height:1.4;
  border-bottom:1px solid var(--hair);
  transition:padding-left .22s var(--ease);
}

.toc li:last-child a{border-bottom:0}

.toc a:hover{padding-left:6px}

.idx{
  font-family:"JetBrains Mono",monospace;
  font-size:12px;
  letter-spacing:.12em;
  color:var(--dim);
}

/* ---------- 页脚 ---------- */
footer{
  background:var(--ink);
  color:var(--paper);
  padding:clamp(36px,5vw,72px) clamp(20px,4vw,64px) clamp(24px,3vw,40px);
  display:grid;
  gap:clamp(24px,3vw,40px);
}

.foot-cta{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  flex-wrap:wrap;
  border-bottom:1px solid rgba(255,255,255,.3);
  padding-bottom:clamp(20px,3vw,32px);
}

.foot-cta h2{
  margin:0;
  font-size:clamp(26px,6vw,68px);
  line-height:1.05;
  word-break:break-word;
}

.foot-btn{
  display:inline-flex;
  align-items:center;
  min-height:48px;
  padding:12px 26px;
  border:1px solid var(--paper);
  border-radius:28px;
  color:var(--paper);
  text-decoration:none;
  font-size:16px;
  transition:background .22s var(--ease),color .22s var(--ease);
}

.foot-btn:hover{background:var(--paper);color:var(--ink)}

.foot-row{
  display:flex;
  justify-content:space-between;
  align-items:flex-start;
  gap:20px;
  flex-wrap:wrap;
  font-size:16px;
}

.foot-id address{
  font-style:normal;
  font-family:"Orbitron","JetBrains Mono",sans-serif;
  letter-spacing:.1em;
}

.copy{margin:4px 0 0;opacity:.7}

.foot-links{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  gap:8px 22px;
  flex-wrap:wrap;
}

.foot-links a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  color:var(--paper);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:border-color .22s var(--ease);
}

.foot-links a:hover{border-color:var(--paper)}

/* ---------- 动效 ---------- */
.js .reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}

.js .reveal.in{opacity:1;transform:none}

/* ---------- 断点 ---------- */
@media (max-width:1060px){
  main{grid-template-columns:minmax(0,1fr)}
  .side{
    position:static;
    border-left:0;
    border-top:1px solid var(--line);
    padding:clamp(24px,4vw,40px) clamp(20px,4vw,64px);
  }
  .aside-card{border-radius:28px}
  .toc{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:0 18px}
}

@media (max-width:860px){
  body{padding-left:0;padding-top:var(--bar)}
  .rail{
    right:0;
    bottom:auto;
    width:auto;
    height:var(--bar);
    flex-direction:row;
    align-items:center;
    justify-content:flex-start;
    gap:10px;
    padding:0 16px;
    border-right:0;
    border-bottom:1px solid var(--line);
  }
  .brand{
    flex-direction:row;
    align-items:center;
    gap:8px;
    padding:0;
  }
  .brand-name{writing-mode:horizontal-tb;font-size:16px;letter-spacing:.14em}
  .burger{
    order:3;
    width:auto;
    min-height:44px;
    min-width:60px;
    flex-direction:row;
    gap:8px;
    padding:8px 12px;
    font-size:13px;
    border-radius:24px;
  }
  .burger-bar{width:14px}
  .burger-bar::before{transform:translateY(-4px)}
  .rail-cta{
    position:static;
    order:2;
    margin-left:auto;
    min-height:44px;
    padding:8px 14px;
    border:1px solid var(--line);
    border-radius:24px;
    font-size:15px;
  }
  .menu{padding:calc(var(--bar) + 24px) 18px 24px;align-items:flex-start;padding-top:calc(var(--bar) + 28px)}
  .menu a{font-size:clamp(19px,5vw,26px);min-height:56px}
  .hero{
    min-height:0;
    grid-template-columns:1fr;
    gap:18px;
    text-align:left;
  }
  .hero-text{text-align:left}
  .lead{margin-left:0;max-width:none}
  .hero-mark{width:56px;order:-1}
  .content-block div[id]{scroll-margin-top:calc(var(--bar) + 16px)}
  footer{padding:32px 18px 28px}
  .foot-cta{flex-direction:column;align-items:flex-start}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .reveal{opacity:1;transform:none;transition:none}
  .menu a:hover,
  .toc a:hover,
  .burger:hover{transform:none}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}

button[aria-expanded]{min-width:44px;min-height:44px}