:root{
  --ink:#000;
  --paper:#fff;
  --line:rgba(255,255,255,.28);
  --pad:clamp(1.25rem,5vw,3.5rem);
  --display:'Barlow Condensed','Barlow','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --body:'Barlow','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;overflow-x:clip;max-width:100%;width:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--body);
  font-size:17px;
  font-weight:400;
  line-height:1.7;
  overflow-x:clip;
  overflow-wrap:break-word;
  max-width:100%;
  width:100%;
  -webkit-font-smoothing:antialiased;
}
img,svg,video,iframe{max-width:100%}
img{display:block;height:auto}
a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
.sr{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 角落品牌 ---------- */
.corner{
  position:fixed;
  top:0;
  right:0;
  z-index:70;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-width:52px;
  min-height:52px;
  max-width:96px;
  padding:12px 16px;
  background:var(--paper);
  color:var(--ink);
  border-left:3px solid var(--ink);
  border-bottom:3px solid var(--ink);
  font-family:var(--display);
  font-weight:700;
  font-size:19px;
  letter-spacing:-.02em;
  line-height:1;
  text-align:center;
}
.corner span{
  max-width:100%;
  min-width:0;
  line-height:1.05;
  text-align:center;
  overflow-wrap:break-word;
  word-break:break-word;
}
.corner img{height:26px;width:auto;max-width:58px;object-fit:contain}

/* ---------- Hero ---------- */
main{display:block;max-width:100%;overflow-x:clip}
.hero{
  position:relative;
  display:flex;
  align-items:flex-end;
  min-height:70vh;
  min-height:70svh;
  padding:clamp(4.5rem,14vh,8rem) var(--pad) clamp(2.5rem,8vh,4.5rem);
  background:var(--ink);
  color:var(--paper);
  overflow:hidden;
  isolation:isolate;
  max-width:100%;
}
.hero__fig{
  position:absolute;
  inset:0;
  margin:0;
  z-index:-1;
  background:var(--ink);
}
.hero__fig::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(0,0,0,.7) 0%,rgba(0,0,0,.32) 45%,rgba(0,0,0,.88) 100%);
}
.hero__img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(1) contrast(1.08);
  opacity:.6;
}
.hero__ghost{
  position:absolute;
  left:0;
  right:0;
  top:46%;
  z-index:-1;
  transform:translateY(-50%);
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(2.2rem,12vw,11rem);
  line-height:.8;
  letter-spacing:-.05em;
  white-space:nowrap;
  text-align:center;
  color:transparent;
  -webkit-text-stroke:2px rgba(255,255,255,.3);
  pointer-events:none;
  user-select:none;
}
.hero__copy{position:relative;z-index:1;width:100%;min-width:0;max-width:100%}
.hero h1{
  margin:0;
  max-width:20ch;
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(2.4rem,8.6vw,7.5rem);
  line-height:.92;
  letter-spacing:-.045em;
  text-wrap:balance;
  overflow-wrap:break-word;
  word-break:break-word;
}

/* ---------- 内容骨架 ---------- */
.layout{
  display:grid;
  grid-template-columns:minmax(0,1fr) 290px;
  gap:clamp(2rem,5vw,4.5rem);
  width:100%;
  max-width:1240px;
  margin:0 auto;
  padding:clamp(2.5rem,7vw,5.5rem) var(--pad);
}
.layout > *{min-width:0;max-width:100%}
.prose{min-width:0;max-width:100%;overflow-x:clip;overflow-wrap:break-word}
.prose > *,.prose section > *{min-width:0;max-width:100%}
.prose section{
  padding-block:clamp(2.25rem,6vw,4.25rem);
  border-top:3px solid var(--ink);
  scroll-margin-top:24px;
  scroll-margin-bottom:110px;
}
.prose section:first-child{border-top:0;padding-top:0}
.prose h2{
  margin:0 0 1.1rem;
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(2rem,5.6vw,3.6rem);
  line-height:1;
  letter-spacing:-.035em;
  overflow-wrap:break-word;
}
.prose h3{
  margin:2rem 0 .7rem;
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(1.4rem,3.2vw,2rem);
  line-height:1.12;
  letter-spacing:-.02em;
  overflow-wrap:break-word;
}
.prose p{
  margin:0 0 1.1rem;
  max-width:66ch;
  font-size:clamp(17px,1.5vw,18.5px);
  overflow-wrap:break-word;
}
.prose .subtitle,
.prose .lead,
.side .subtitle{
  margin:0 0 1.4rem;
  padding-left:.9rem;
  border-left:4px solid var(--ink);
  font-size:18px;
  font-weight:600;
  line-height:1.55;
  overflow-wrap:break-word;
}
.prose ul,.prose ol{margin:0 0 1.3rem;padding-left:1.2rem;max-width:66ch}
.prose li{margin:.35rem 0;overflow-wrap:break-word}
.prose blockquote{
  margin:2rem 0;
  padding:1.2rem 1.4rem;
  max-width:100%;
  background:var(--ink);
  color:var(--paper);
  font-size:clamp(17px,2vw,20px);
  font-weight:600;
}
.prose blockquote p:last-child{margin-bottom:0}
.prose figure{margin:2rem 0;max-width:100%}
.prose figcaption{font-size:16px;line-height:1.6;padding-top:.6rem;color:#333;overflow-wrap:break-word}
.prose img{width:100%;height:auto}
.prose pre{
  margin:1.5rem 0;
  padding:1rem;
  max-width:100%;
  overflow-x:auto;
  background:#f2f2f2;
  font-size:16px;
  line-height:1.6;
}
.prose code{font-size:16px;overflow-wrap:break-word}
.prose table{
  display:block;
  width:100%;
  max-width:100%;
  overflow-x:auto;
  border-collapse:collapse;
  margin:1.5rem 0;
  font-size:16px;
  -webkit-overflow-scrolling:touch;
}
.prose th,.prose td{border-bottom:2px solid var(--ink);padding:.7rem .5rem;text-align:left;vertical-align:top}
.prose th{font-weight:700;border-bottom-width:4px;white-space:nowrap}
.prose td{overflow-wrap:break-word}
.prose hr{border:0;border-top:3px solid var(--ink);margin:2rem 0}
.prose strong{font-weight:700}
.prose a{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:3px;overflow-wrap:break-word}

/* ---------- 侧栏 ---------- */
.side{
  align-self:start;
  min-width:0;
  max-width:100%;
  overflow-wrap:break-word;
  position:sticky;
  top:clamp(1.5rem,4vh,3rem);
  border-top:6px solid var(--ink);
  padding-top:1rem;
}
.side__h{
  margin:0 0 .6rem;
  font-family:var(--display);
  font-weight:700;
  font-size:1.6rem;
  line-height:1.1;
  letter-spacing:-.02em;
}
.side .subtitle{border-left-width:3px;font-size:16px;margin-bottom:1.2rem}
.side__list{list-style:none;margin:0 0 1.4rem;padding:0;border-top:2px solid var(--ink)}
.side__list li{border-bottom:2px solid var(--ink)}
.side__list a{display:block;padding:10px 2px;min-height:40px;font-weight:600;font-size:16px}
.side__list a:hover{background:var(--ink);color:var(--paper);padding-left:.6rem}
.side__top{
  display:inline-block;
  padding:11px 18px;
  background:var(--ink);
  color:var(--paper);
  font-weight:700;
  font-size:16px;
  letter-spacing:.02em;
}
.side__top:hover{box-shadow:6px 6px 0 rgba(0,0,0,.25)}

/* ---------- 页脚 ---------- */
.foot{
  background:var(--ink);
  color:var(--paper);
  padding:clamp(2.5rem,7vw,5rem) var(--pad) calc(112px + env(safe-area-inset-bottom));
  overflow-x:clip;
  max-width:100%;
  overflow-wrap:break-word;
}
.foot__grid{
  display:grid;
  grid-template-columns:1.15fr 1fr 1.15fr;
  gap:clamp(1.5rem,4vw,3rem);
  max-width:1240px;
  margin:0 auto;
  align-items:start;
}
.foot__grid > *{min-width:0;max-width:100%}
.foot__contact{font-style:normal;display:flex;flex-direction:column;gap:.4rem;min-width:0;max-width:100%}
.foot__brand{
  font-family:var(--display);
  font-weight:700;
  font-size:clamp(1.5rem,3vw,2rem);
  line-height:1.05;
  letter-spacing:-.03em;
  overflow-wrap:break-word;
}
.foot__kw{font-size:16px;line-height:1.6;color:rgba(255,255,255,.62);overflow-wrap:break-word}
.foot__contact a{
  display:inline-block;
  align-self:flex-start;
  margin-top:.4rem;
  padding:10px 16px;
  min-height:44px;
  background:var(--paper);
  color:var(--ink);
  font-weight:700;
  font-size:16px;
}
.foot__links{list-style:none;margin:0;padding:0;border-top:2px solid var(--line);min-width:0;max-width:100%}
.foot__links li{border-bottom:2px solid var(--line)}
.foot__links a{display:block;padding:10px 0;min-height:40px;font-size:16px;font-weight:500;color:var(--paper);overflow-wrap:break-word}
.foot__links a:hover{padding-left:.5rem;background:rgba(255,255,255,.1)}
.sub{display:flex;gap:.5rem;flex-wrap:wrap;min-width:0;max-width:100%}
.sub label{width:100%}
.sub input{
  flex:1 1 8rem;
  min-width:0;
  width:100%;
  padding:12px 14px;
  border:2px solid var(--paper);
  background:var(--ink);
  color:var(--paper);
  font:inherit;
  font-size:16px;
  border-radius:0;
}
.sub input::placeholder{color:rgba(255,255,255,.55)}
.sub button{
  flex:0 0 auto;
  padding:12px 20px;
  min-height:44px;
  border:2px solid var(--paper);
  background:var(--paper);
  color:var(--ink);
  font:inherit;
  font-weight:700;
  font-size:16px;
  cursor:pointer;
  border-radius:0;
}
.sub button:hover{background:var(--ink);color:var(--paper)}
.copy{
  max-width:1240px;
  margin:clamp(2rem,5vw,3rem) auto 0;
  padding-top:1rem;
  border-top:2px solid var(--line);
  font-size:16px;
  color:rgba(255,255,255,.72);
}

/* ---------- 底部固定条 ---------- */
.dock{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:60;
  max-width:100%;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:clamp(.5rem,2vw,1.5rem);
  padding:8px clamp(.6rem,3vw,1.5rem) calc(8px + env(safe-area-inset-bottom));
  background:var(--ink);
  color:var(--paper);
  border-top:2px solid var(--paper);
  box-sizing:border-box;
}
.dock > *{min-width:0}
.dock dl{
  display:grid;
  grid-template-columns:repeat(3,auto);
  align-items:center;
  min-width:0;
  max-width:100%;
  gap:0 .5rem;
  margin:0;
}
.dock dt{
  grid-row:1;
  padding:8px 12px;
  font-size:16px;
  font-weight:600;
  letter-spacing:.04em;
  color:rgba(255,255,255,.66);
  white-space:nowrap;
  cursor:default;
}
.dock dt:nth-of-type(1){grid-column:1}
.dock dt:nth-of-type(2){grid-column:2}
.dock dt:nth-of-type(3){grid-column:3}
.dock dt:hover{background:var(--paper);color:var(--ink)}
.dock dd{
  position:fixed;
  left:50%;
  bottom:74px;
  margin:0;
  display:flex;
  flex-direction:column;
  gap:2px;
  min-width:200px;
  max-width:calc(100vw - 24px);
  padding:8px;
  background:var(--ink);
  border:2px solid var(--paper);
  opacity:0;
  pointer-events:none;
  transform:translate(-50%,6px);
  transition:opacity .16s ease,transform .16s ease;
  transition-delay:.28s;
}
.dock dt:hover + dd,
.dock dd:hover,
.dock dd:focus-within{
  opacity:1;
  pointer-events:auto;
  transform:translate(-50%,0);
  transition-delay:0s;
}
.dock dd a{
  display:block;
  padding:12px 14px;
  min-height:44px;
  color:var(--paper);
  font-weight:600;
  font-size:16px;
  white-space:nowrap;
}
.dock dd a:hover,
.dock dd a:focus-visible{background:var(--paper);color:var(--ink);outline:none}
.dock__cta{
  flex:0 0 auto;
  padding:12px 18px;
  min-height:44px;
  background:var(--paper);
  color:var(--ink);
  font-weight:700;
  font-size:16px;
  white-space:nowrap;
}

/* ---------- 动效 ---------- */
.reveal-on .rv{
  opacity:0;
  transform:translateY(26px);
  transition:opacity .6s cubic-bezier(.2,.7,.3,1),transform .6s cubic-bezier(.2,.7,.3,1);
  transition-delay:calc(var(--i,0) * 70ms);
}
.reveal-on .rv.is-in{opacity:1;transform:none}

/* ---------- 断点 ---------- */
@media (max-width:960px){
  .layout{grid-template-columns:1fr}
  .side{position:static}
}
@media (max-width:880px){
  .foot{padding-bottom:calc(146px + env(safe-area-inset-bottom))}
  .dock{gap:.5rem;padding-inline:8px}
  .dock dl{
    display:flex;
    flex:1 1 0;
    flex-wrap:wrap;
    justify-content:center;
    min-width:0;
    max-width:100%;
    gap:0;
    overflow:visible;
  }
  .dock dt{display:none}
  .dock dd{
    position:static;
    opacity:1;
    pointer-events:auto;
    transform:none;
    flex:0 0 auto;
    flex-direction:row;
    flex-wrap:wrap;
    justify-content:center;
    border:0;
    padding:0;
    min-width:0;
    max-width:none;
    background:none;
  }
  .dock dd a{padding:11px 9px;min-height:44px;white-space:nowrap}
  .foot__grid{grid-template-columns:1fr}
  .foot__links{border-top:2px solid var(--line)}
}
@media (max-width:560px){
  :root{--pad:1rem}
  body{font-size:17px}
  .hero{min-height:66vh;min-height:66svh}
  .hero h1{font-size:clamp(2.05rem,9vw,3.4rem)}
  .hero__ghost{font-size:clamp(1.8rem,9.4vw,2.8rem);-webkit-text-stroke-width:1.5px}
  .foot__brand{font-size:1.6rem}
  .foot{padding-bottom:calc(132px + env(safe-area-inset-bottom))}
  .corner{min-width:48px;min-height:48px;padding:8px 10px;max-width:78px}
  .corner span{font-size:15px;letter-spacing:0}
  .dock{gap:0;padding-inline:6px}
  .dock dl{flex:1 1 100%}
  .dock dd a{padding:11px 7px;font-size:16px}
  .dock__cta{display:none}
  .prose ul,.prose ol{padding-left:1rem}
  .sub input{flex:1 1 100%}
  .sub button{flex:1 1 100%}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal-on .rv{opacity:1;transform:none;transition:none}
}

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