:root{
  --ink:#000000;
  --paper:#ffffff;
  --slab:#f1f1ef;
  --rail:4.6rem;
  --pad:clamp(1.25rem,4vw,4.25rem);
  --soft:clamp(.5rem,1.6vw,1.4rem);
}

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

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

body{
  margin:0;
  padding-left:var(--rail);
  background:var(--paper);
  color:var(--ink);
  font-family:'Lexend','Source Sans 3',-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  font-size:1.0625rem;
  line-height:1.7;
  font-weight:400;
  overflow-x:hidden;
}

img{display:block;max-width:100%}
a{color:inherit}
p{margin:0 0 1.15rem;max-width:64ch}
ul,ol{margin:0}
h1,h2,h3,h4{margin:0;font-weight:900;line-height:1.04;letter-spacing:-.045em}
hr{border:0;border-top:2px solid var(--ink);margin:0 0 1.6rem}
strong{font-weight:700}

:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
.rail :focus-visible,.foot :focus-visible{outline-color:currentColor}

/* 顶部细条 */
.ticker{
  position:sticky;
  top:0;
  z-index:50;
  margin:0;
  padding:.72rem var(--pad);
  max-width:none;
  background:var(--ink);
  color:var(--paper);
  font-size:.82rem;
  letter-spacing:.16em;
  font-weight:500;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

/* 左侧竖排导航 */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  z-index:60;
  width:var(--rail);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.9rem;
  padding:.85rem 0 1.4rem;
  background:var(--ink);
  color:var(--paper);
}

.brand{
  flex:0 0 auto;
  display:grid;
  place-items:center;
  width:2.7rem;
  height:2.7rem;
  border-radius:10px;
  background:var(--paper);
  color:var(--ink);
  font-size:1.05rem;
  font-weight:900;
  letter-spacing:0;
  text-decoration:none;
  transition:transform .18s ease;
}
.brand:hover{transform:rotate(-6deg)}
.brand img{width:1.7rem;height:1.7rem;object-fit:contain}

.rail-stack{
  width:100%;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.15rem;
}

.rail-link,.rail-group summary{
  display:flex;
  align-items:center;
  justify-content:center;
  width:100%;
  min-height:2.9rem;
  padding:.9rem .1rem;
  writing-mode:vertical-rl;
  text-decoration:none;
  font-size:.94rem;
  font-weight:500;
  letter-spacing:.14em;
  color:var(--paper);
  cursor:pointer;
  transition:background .18s ease,color .18s ease;
}
.rail-link:hover,.rail-group summary:hover{background:#1c1c1c}
.rail-lead{background:#1c1c1c}

.rail-group{position:relative;width:100%}
.rail-group summary{list-style:none}
.rail-group summary::-webkit-details-marker{display:none}
.rail-group summary::after{
  content:"+";
  margin-top:.35rem;
  font-size:.8rem;
  letter-spacing:0;
}
.rail-group[open] summary{background:var(--paper);color:var(--ink)}
.rail-group[open] summary::after{content:"−"}

.rail-group ul{
  position:absolute;
  left:calc(100% + .45rem);
  top:0;
  z-index:70;
  min-width:9.5rem;
  margin:0;
  padding:.4rem;
  list-style:none;
  display:grid;
  gap:.1rem;
  background:var(--paper);
  color:var(--ink);
  border-radius:10px;
  box-shadow:0 14px 44px rgba(0,0,0,.22);
  writing-mode:horizontal-tb;
}
.rail-group ul a{
  display:flex;
  align-items:center;
  min-height:2.6rem;
  padding:.6rem .75rem;
  border-radius:10px;
  font-size:.95rem;
  letter-spacing:.02em;
  text-decoration:none;
  transition:background .15s ease,color .15s ease;
}
.rail-group ul a:hover{background:var(--ink);color:var(--paper)}

/* 首屏 */
.hero{
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:clamp(1.5rem,4.5vw,4.5rem);
  align-items:center;
  min-height:calc(100vh - 3rem);
  min-height:calc(100svh - 3rem);
  padding:clamp(2.5rem,7vw,6rem) var(--pad) clamp(2.5rem,5vw,5rem);
  border-bottom:2px solid var(--ink);
}

.hero-copy{min-width:0}

.hero h1{
  font-size:clamp(2.5rem,8.6vw,7.6rem);
  line-height:.94;
  letter-spacing:-.055em;
  margin:0 0 1.4rem;
  overflow-wrap:break-word;
}

.lede{
  font-size:clamp(1.05rem,1.6vw,1.3rem);
  line-height:1.6;
  letter-spacing:-.01em;
  max-width:34ch;
  margin-bottom:2rem;
}

.hero-go{margin:0}

.cta{
  display:inline-flex;
  align-items:center;
  min-height:3rem;
  padding:.9rem 1.7rem;
  border-radius:10px;
  background:var(--ink);
  color:var(--paper);
  font-weight:700;
  font-size:1rem;
  letter-spacing:.02em;
  text-decoration:none;
  transition:transform .18s ease,background .18s ease;
}
.cta:hover{background:#262626;transform:translateY(-3px)}

.hero-media{
  position:relative;
  align-self:stretch;
  min-height:clamp(17rem,50vh,33rem);
  border-radius:10px;
  background:var(--ink);
  overflow:hidden;
}

.hero-img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  transform:scale(1.07);
  will-change:transform;
}

.badge{
  position:absolute;
  top:1rem;
  left:1rem;
  margin:0;
  padding:.5rem 1rem;
  border-radius:10px;
  background:var(--paper);
  color:var(--ink);
  font-size:.85rem;
  font-weight:700;
  letter-spacing:.06em;
  box-shadow:0 10px 30px rgba(0,0,0,.25);
}

/* 正文 */
.page{
  display:grid;
  grid-template-columns:minmax(0,14rem) minmax(0,1fr);
  gap:clamp(1.5rem,3.4vw,3.5rem);
  align-items:start;
  max-width:86rem;
  padding:clamp(2.5rem,6vw,5rem) var(--pad) clamp(3rem,7vw,6rem);
}

.page > aside{
  grid-column:1;
  grid-row:1 / span 24;
  position:sticky;
  top:4.4rem;
  align-self:start;
}

.toc h2{
  font-size:1rem;
  letter-spacing:.16em;
  font-weight:700;
}
.toc hr{border-top:1px solid var(--ink);margin:.7rem 0 1rem}
.toc ul{list-style:none;padding:0;display:grid;gap:.1rem}
.toc a{
  display:flex;
  align-items:center;
  min-height:2.1rem;
  padding:.45rem 0;
  font-size:.92rem;
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:border-color .15s ease,padding-left .15s ease;
}
.toc a:hover{border-bottom-color:var(--ink);padding-left:.3rem}

.page > div{
  grid-column:2;
  padding-block:clamp(2.4rem,5.5vw,4.4rem);
  border-top:2px solid var(--ink);
  scroll-margin-top:4.2rem;
}
.page > div:first-of-type{border-top:0;padding-top:0}

.page > div h2{
  font-size:clamp(1.85rem,4.4vw,3.5rem);
  margin:0 0 .7rem;
}
.page > div h3{
  font-size:clamp(1.25rem,2.4vw,1.75rem);
  margin:2rem 0 .6rem;
  letter-spacing:-.03em;
}
.page > div h4{
  font-size:1.1rem;
  margin:1.6rem 0 .5rem;
  letter-spacing:-.02em;
}
.page > div ul,
.page > div ol{padding-left:1.3rem;margin-bottom:1.2rem}
.page > div li{margin-bottom:.5rem;max-width:62ch}
.page > div p:last-child{margin-bottom:0}

.page > div blockquote{
  margin:1.6rem 0;
  padding:1.3rem 1.5rem;
  border-radius:10px;
  background:var(--slab);
}
.page > div blockquote p{margin:0;max-width:none}

.page > div table{
  width:100%;
  border-collapse:collapse;
  margin:1.4rem 0;
  font-size:.98rem;
}
.page > div th,
.page > div td{
  text-align:left;
  padding:.75rem .8rem;
  border-bottom:2px solid var(--ink);
}
.page > div th{font-weight:700}

/* 页脚 */
.foot{
  display:grid;
  grid-template-columns:1.15fr .8fr 1fr;
  gap:clamp(1.5rem,4vw,3rem);
  padding:clamp(2.6rem,6vw,4.5rem) var(--pad) 1.6rem;
  border-top:2px solid var(--ink);
}

.foot-addr{
  font-style:normal;
  display:grid;
  gap:.5rem;
  align-content:start;
  max-width:26rem;
}
.foot-addr strong{font-size:1.3rem;font-weight:900;letter-spacing:-.03em}
.foot-addr span{font-size:.95rem;line-height:1.6}

.foot-links{
  list-style:none;
  padding:0;
  display:grid;
  gap:.1rem;
  align-content:start;
}
.foot-links a,
.foot-nav a{
  display:inline-flex;
  align-items:center;
  min-height:2.6rem;
  padding:.5rem 0;
  text-decoration:none;
  font-size:.98rem;
  border-bottom:1px solid transparent;
  transition:border-color .15s ease;
}
.foot-links a:hover,
.foot-nav a:hover{border-bottom-color:var(--ink)}

.foot-nav dl{margin:0;display:grid;gap:.1rem}
.foot-nav dt{
  font-size:.82rem;
  font-weight:700;
  letter-spacing:.16em;
  margin-top:.7rem;
}
.foot-nav dt:first-child{margin-top:0}
.foot-nav dd{margin:0}

.foot-word{
  grid-column:1 / -1;
  margin:clamp(1.6rem,4vw,3rem) 0 0;
  max-width:none;
  font-size:clamp(3rem,15vw,10.5rem);
  font-weight:900;
  line-height:.84;
  letter-spacing:-.06em;
}

.foot-copy{
  grid-column:1 / -1;
  margin:clamp(1rem,2.5vw,1.8rem) 0 0;
  padding-top:1rem;
  border-top:1px solid var(--ink);
  font-size:.88rem;
  max-width:none;
}

@media (max-width:1100px){
  .foot{grid-template-columns:1fr 1fr}
  .foot-nav{grid-column:1 / -1}
}

@media (max-width:880px){
  .hero{grid-template-columns:1fr}
  .hero-media{min-height:clamp(15rem,42vh,24rem)}
  .page{grid-template-columns:minmax(0,1fr)}
  .page > aside{
    grid-column:1;
    grid-row:auto;
    position:static;
    padding-bottom:1.4rem;
    border-bottom:2px solid var(--ink);
    margin-bottom:clamp(1.4rem,4vw,2.4rem);
  }
  .page > div{grid-column:1}
  .toc ul{grid-template-columns:repeat(2,minmax(0,1fr));gap:.1rem 1.2rem}
  .foot{grid-template-columns:1fr}
  .foot-nav{grid-column:1}
}

@media (max-width:620px){
  :root{--rail:3.3rem;--pad:1.15rem}
  body{font-size:1rem}
  .brand{width:2.3rem;height:2.3rem;font-size:.95rem}
  .brand img{width:1.4rem;height:1.4rem}
  .rail-link,.rail-group summary{font-size:.86rem;letter-spacing:.1em;padding:.8rem 0;min-height:2.6rem}
  .rail-group ul{min-width:8.4rem;left:calc(100% + .3rem)}
  .rail-group ul a{font-size:.9rem;min-height:2.5rem;padding:.55rem .65rem}
  .ticker{font-size:.76rem;letter-spacing:.08em;padding:.62rem var(--pad)}
  .hero h1{font-size:clamp(2.2rem,10.5vw,3.4rem)}
  .toc ul{grid-template-columns:minmax(0,1fr)}
  .foot-word{font-size:clamp(2.6rem,15vw,4.4rem)}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition-duration:.001ms !important;animation-duration:.001ms !important}
}
</｜DSML｜ parameter>
</｜DSML｜ invoke>
</｜DSML｜ calls>

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