:root{
  --ink:#000000;
  --paper:#ffffff;
  --line:rgba(0,0,0,.22);
  --soft:rgba(0,0,0,.5);
  --r:28px;
  --pad:clamp(1rem,4vw,3.5rem);
  --mono:"Fira Code","Share Tech Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --huge:clamp(2.4rem,9vw,7.2rem);
}
*,*::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:var(--mono);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-underline-offset:3px;text-decoration-thickness:1px}
p{margin:0 0 1.1rem}
.wrap{width:100%;max-width:1240px;margin-inline:auto;padding-inline:var(--pad)}

/* 顶部 */
.top{border-bottom:1px solid var(--ink)}
.ticker{
  display:flex;justify-content:space-between;gap:1rem;align-items:center;
  margin:0;padding:.5rem 0;font-size:.72rem;letter-spacing:.32em;
  border-bottom:1px solid var(--line);overflow:hidden;white-space:nowrap;
}
.ticker span:nth-child(2){opacity:.42}
.brandrow{padding-block:clamp(.7rem,2.4vw,1.2rem)}
.brand{
  display:inline-flex;align-items:center;min-height:44px;line-height:1;
  font-size:clamp(1.45rem,5.4vw,2.9rem);font-weight:700;letter-spacing:-.055em;
  text-decoration:none;
}
.mark{height:clamp(1.6rem,4.6vw,2.4rem);width:auto;border-radius:8px}
.menu{
  display:flex;gap:.5rem;overflow-x:auto;padding-block:.65rem;
  scrollbar-width:none;-ms-overflow-style:none;
}
.menu::-webkit-scrollbar{display:none}
.pill{
  display:inline-flex;align-items:center;min-height:42px;padding:.5rem 1rem;
  border:1px solid var(--ink);border-radius:999px;text-decoration:none;
  font-size:1rem;white-space:nowrap;
  transition:background .18s ease,color .18s ease,transform .18s ease;
}
.pill:hover,.pill:focus-visible{background:var(--ink);color:var(--paper);transform:translate(-2px,-2px)}

main.wrap{padding-block:clamp(1rem,3vw,2rem) 0}

/* 首屏 */
.hero{
  position:relative;background:var(--ink);color:var(--paper);
  border-radius:var(--r);padding:clamp(1.25rem,3.5vw,2.75rem);
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(1rem,3vw,2.5rem);align-items:end;min-height:45vh;
}
.hero-copy{text-align:right;min-width:0}
.hero-tag{
  display:inline-block;margin:0 0 clamp(.6rem,2vw,1.1rem);
  background:var(--paper);color:var(--ink);border-radius:999px;
  padding:.34em .95em;font-size:.85rem;letter-spacing:.18em;
  transform:rotate(-3deg);
}
.hero h1{
  margin:0;font-size:var(--huge);font-weight:700;line-height:.94;
  letter-spacing:-.055em;overflow-wrap:anywhere;
}
.hero-desc{
  margin:clamp(.7rem,2vw,1.2rem) 0 0 auto;max-width:36ch;
  font-size:.98rem;line-height:1.7;color:rgba(255,255,255,.82);
}
.hero-figure{
  margin:0;width:clamp(5.5rem,15vw,11rem);aspect-ratio:1;
  background:var(--paper);border-radius:var(--r);
  display:grid;place-items:center;overflow:hidden;
}
.hero-media{width:100%;height:100%;object-fit:cover;border-radius:var(--r)}
.target{
  width:56%;aspect-ratio:1;border:1px solid var(--ink);border-radius:50%;
  position:relative;animation:spin 22s linear infinite;
}
.target::before{
  content:"";position:absolute;inset:0;border-radius:50%;
  border-top:1px solid var(--ink);border-bottom:1px solid var(--ink);
  transform:rotate(38deg);
}
.target::after{
  content:"";position:absolute;left:50%;top:50%;width:6px;height:6px;
  margin:-3px 0 0 -3px;border-radius:50%;background:var(--ink);
}
@keyframes spin{to{transform:rotate(1turn)}}

/* 正文与侧栏 */
.body{
  display:grid;grid-template-columns:minmax(0,1fr) 14rem;
  gap:clamp(1.5rem,4vw,3.5rem);align-items:start;
  margin-top:clamp(1.5rem,4vw,3rem);
}
.content{min-width:0}
.content > div{
  padding-block:clamp(2.25rem,5.5vw,4.5rem);
  border-top:1px solid var(--line);scroll-margin-top:1.5rem;
}
.content > div:first-child{border-top:0;padding-top:0}
.content h2{
  margin:0 0 1.1rem;font-size:clamp(1.7rem,4.2vw,2.9rem);
  font-weight:700;line-height:1.06;letter-spacing:-.045em;overflow-wrap:anywhere;
}
.content h3{
  margin:2.2rem 0 .6rem;font-size:clamp(1.1rem,2.2vw,1.5rem);
  font-weight:600;line-height:1.25;letter-spacing:-.02em;
}
.content p,.content li{max-width:66ch}
.content p{font-size:1.06rem;line-height:1.85}
.content ul,.content ol{padding-left:1.15em;margin:0 0 1.2rem}
.content li{margin-bottom:.4rem}
.content a{color:var(--ink);text-decoration-color:var(--ink)}
.content a:hover{background:var(--ink);color:var(--paper);text-decoration:none}
.content figure{margin:1.6rem 0}
.content img,.content figure img{border-radius:var(--r)}
.content blockquote{
  margin:1.6rem 0;padding:.2rem 0 .2rem 1.2rem;
  border-left:2px solid var(--ink);font-size:1rem;
}
.content blockquote p:last-child{margin-bottom:0}
.content hr{border:0;border-top:1px solid var(--line);margin:2rem 0}
.content strong{font-weight:700}

.rail{
  position:sticky;top:1.25rem;align-self:start;
  border-left:1px solid var(--line);padding-left:1.2rem;
}
.rail small{display:block;font-size:.75rem;letter-spacing:.34em;opacity:.55;line-height:1.4}
.rail h2{margin:.15rem 0 .8rem;font-size:1.05rem;letter-spacing:-.01em;line-height:1.3}
.rail-list{list-style:none;margin:0;padding:0}
.rail-list a{
  display:flex;align-items:center;min-height:40px;padding:.35rem 0;
  font-size:1rem;text-decoration:none;border-bottom:1px dotted rgba(0,0,0,.25);
  transition:padding-left .16s ease;
}
.rail-list a:hover{padding-left:.45rem;text-decoration:underline}

/* 页脚 */
.foot{
  margin-top:clamp(2.5rem,7vw,5rem);
  background:var(--ink);color:var(--paper);
  border-radius:var(--r) var(--r) 0 0;
  padding:clamp(1.75rem,5vw,3.5rem) var(--pad) clamp(1.25rem,3vw,2rem);
}
.foot-cta a{
  display:inline-block;padding-block:.1em;text-decoration:none;color:var(--paper);
  font-size:clamp(2.2rem,9vw,5.5rem);font-weight:700;line-height:1;
  letter-spacing:-.055em;transition:letter-spacing .22s ease;
}
.foot-cta a:hover{letter-spacing:-.03em;text-decoration:underline}
.foot-bar{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.75rem 1.75rem;margin-top:clamp(1.25rem,4vw,2.5rem);
  padding-top:1.1rem;border-top:1px solid rgba(255,255,255,.32);
}
.foot-logo{
  display:inline-flex;align-items:center;min-height:40px;
  font-weight:700;letter-spacing:-.04em;font-size:1.1rem;text-decoration:none;
}
.foot-logo .mark{height:1.5rem;border-radius:6px}
.foot-nav dl{display:flex;flex-wrap:wrap;margin:0;gap:0 .35rem}
.foot-nav dt{
  display:flex;align-items:center;font-size:.78rem;letter-spacing:.16em;
  color:rgba(255,255,255,.55);
}
.foot-nav dd{margin:0 1.1rem 0 .4rem}
.foot-nav a{
  display:inline-flex;align-items:center;min-height:40px;font-size:.95rem;
  text-decoration:none;
}
.foot-nav a:hover{text-decoration:underline}
.foot-copy{margin:0;font-size:.85rem;letter-spacing:.12em;color:rgba(255,255,255,.6)}

.totop{
  position:fixed;right:1rem;bottom:1rem;z-index:20;
  background:var(--ink);color:var(--paper);border:1px solid var(--paper);
  border-radius:999px;padding:.6rem 1.05rem;
  font:inherit;font-size:.9rem;letter-spacing:.12em;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
}
.totop.on{opacity:1;visibility:visible;transform:none}

@media (prefers-reduced-motion: no-preference){
  .content > div{animation:rise .55s ease both}
  .content > div:nth-child(2){animation-delay:.05s}
  .content > div:nth-child(3){animation-delay:.1s}
  .content > div:nth-child(4){animation-delay:.15s}
  .content > div:nth-child(5){animation-delay:.2s}
  .content > div:nth-child(6){animation-delay:.25s}
  .content > div:nth-child(7){animation-delay:.3s}
  .content > div:nth-child(8){animation-delay:.35s}
}
@keyframes rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .target{animation:none}
  .pill,.totop,.rail-list a,.foot-cta a{transition:none}
}

@media (max-width:760px){
  .body{grid-template-columns:1fr;gap:1.75rem}
  .rail{
    position:static;order:2;border-left:0;border-top:1px solid var(--line);
    padding-left:0;padding-top:1rem;
  }
  .hero{
    grid-template-columns:1fr;align-items:start;min-height:45vh;
    gap:1.1rem;padding:1.25rem;
  }
  .hero-figure{width:clamp(4.5rem,20vw,7rem);border-radius:20px}
  .hero-media{border-radius:20px}
  .hero-copy{text-align:right}
  .hero-desc{max-width:100%}
  .foot{border-radius:20px 20px 0 0}
  .foot-bar{justify-content:flex-start}
  .foot-nav{width:100%}
  .foot-copy{width:100%}
}

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