@import url('https://fonts.googleapis.com/css2?family=Fira+Code:wght@400;500;600;700&family=Fira+Sans:wght@300;400;500;600;700&display=swap');

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

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

body{
  margin:0;
  background:#000;
  color:#fff;
  font-family:'Fira Sans',system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',sans-serif;
  font-size:17px;
  line-height:1.7;
  font-weight:300;
  padding-bottom:104px;
  overflow-x:hidden;
}

a{color:#fff;text-decoration:none}
img{display:block;max-width:100%;height:auto}
h1,h2,h3{font-weight:900;letter-spacing:-.045em;line-height:1.03;margin:0 0 22px}

:focus-visible{outline:2px solid #fff;outline-offset:3px}

.wrap{max-width:1240px;margin:0 auto}

/* ===== 底部固定条 ===== */
.dock{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:60;
  display:flex;
  align-items:center;
  gap:8px;
  padding:10px 16px;
  background:#000;
  border-top:1px solid #fff;
}

.dock .brand{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:6px 4px;
  margin-right:auto;
  font-size:19px;
  font-weight:900;
  letter-spacing:-.05em;
}

.dock-group{position:relative}

.dock-group summary{
  list-style:none;
  cursor:pointer;
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:8px 14px;
  border:1px solid #4a4a4a;
  border-radius:18px;
  font-family:'Fira Code',ui-monospace,monospace;
  font-size:14px;
  letter-spacing:.06em;
  color:#fff;
}

.dock-group summary::-webkit-details-marker{display:none}
.dock-group summary::after{content:'+';margin-left:8px;font-family:'Fira Code',monospace}
.dock-group[open] summary::after{content:'–'}
.dock-group[open] summary{background:#fff;color:#000;border-color:#fff}

.dock-group .panel{
  position:absolute;
  left:0;
  bottom:calc(100% + 12px);
  min-width:230px;
  padding:10px;
  background:#000;
  border:1px solid #fff;
  border-radius:18px;
}

.dock-group .panel ul{list-style:none;margin:0;padding:0}
.dock-group .panel li + li{margin-top:2px}
.dock-group .panel a{display:block;padding:11px 14px;border-radius:12px;font-size:16px}
.dock-group .panel a:hover,.dock-group .panel a:focus-visible{background:#fff;color:#000}

.dock .cta{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:8px 16px;
  border-radius:18px;
  background:#fff;
  color:#000;
  font-size:15px;
  font-weight:700;
  letter-spacing:-.01em;
}

/* ===== 首屏 ===== */
.hero{
  position:relative;
  display:flex;
  align-items:center;
  gap:5vw;
  max-width:1440px;
  margin:0 auto;
  min-height:100svh;
  padding:88px 24px 56px;
}

.hero-copy{flex:1 1 56%;text-align:center;min-width:0}

.hero-copy h1{
  font-size:clamp(2.6rem,8vw,7rem);
  letter-spacing:-.05em;
  line-height:.94;
  margin:0 0 28px;
  word-break:break-word;
}

.lede{
  margin:0 auto;
  max-width:44ch;
  color:#c6c6c6;
  font-size:17px;
  line-height:1.7;
}

.hero-media{flex:1 1 40%;position:relative;min-width:0}
.hero-media img{
  width:100%;
  height:min(70vh,620px);
  object-fit:cover;
  border:1px solid #333;
  border-radius:18px;
}
.hero-media:empty{display:none}

.floaty{
  position:absolute;
  top:12%;
  right:4%;
  z-index:2;
  padding:9px 16px;
  border:1px solid #fff;
  border-radius:18px;
  background:#000;
  font-family:'Fira Code',ui-monospace,monospace;
  font-size:13px;
  letter-spacing:.05em;
  animation:bob 6s ease-in-out infinite;
}

@keyframes bob{50%{transform:translateY(-9px)}}

/* ===== 主体 ===== */
main{
  max-width:1240px;
  margin:0 auto;
  padding:0 24px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 290px;
  gap:clamp(28px,5vw,72px);
  align-items:start;
}

article{min-width:0}
.flow{max-width:70ch}

.flow > div{
  padding:88px 0;
  border-top:1px solid #232323;
  scroll-margin-top:36px;
}
.flow > div:first-child{border-top:0;padding-top:0}

.flow h2{
  font-size:clamp(1.6rem,4vw,2.6rem);
  margin-bottom:22px;
}
.flow h2 span{display:block}

.flow h3{
  font-size:1.15rem;
  font-weight:700;
  letter-spacing:-.015em;
  margin:34px 0 12px;
}

.flow p{margin:0 0 20px;color:#dcdcdc}
.flow ul,.flow ol{margin:0 0 20px;padding-left:22px;color:#dcdcdc}
.flow li{margin-bottom:10px}
.flow li::marker{color:#777}
.flow strong{color:#fff;font-weight:600}
.flow a{text-decoration:underline;text-underline-offset:3px}
.flow a:hover{background:#fff;color:#000;text-decoration:none}
.flow blockquote{
  margin:0 0 22px;
  padding:4px 0 4px 20px;
  border-left:2px solid #fff;
  color:#b5b5b5;
}
.flow img{margin:0 0 22px;border:1px solid #333;border-radius:18px}
.flow hr{border:0;border-top:1px solid #232323;margin:36px 0}

/* ===== 侧栏 ===== */
aside{
  align-self:start;
  position:sticky;
  top:28px;
  padding:96px 0 40px;
}

.eyebrow{
  font-family:'Fira Code',ui-monospace,monospace;
  font-size:12px;
  font-weight:500;
  letter-spacing:.2em;
  color:#8a8a8a;
  margin:0 0 12px;
}
.eyebrow span{display:block}

aside ul{list-style:none;margin:0;padding:0;border-top:1px solid #232323}
aside li{border-bottom:1px solid #191919}
aside a{
  display:block;
  padding:12px 2px;
  font-size:16px;
  color:#e2e2e2;
  transition:padding .18s ease,color .18s ease;
}
aside a:hover{padding-left:9px;color:#fff}

/* ===== 页脚 ===== */
.foot{
  border-top:1px solid #fff;
  margin-top:88px;
  padding:72px 24px 48px;
}

.sub{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.sub input{
  flex:1 1 240px;
  min-height:48px;
  padding:12px 16px;
  border:1px solid #4a4a4a;
  border-radius:18px;
  background:#000;
  color:#fff;
  font:inherit;
  font-size:16px;
}
.sub input::placeholder{color:#7a7a7a}
.sub button{
  min-height:48px;
  padding:12px 26px;
  border:1px solid #fff;
  border-radius:18px;
  background:#fff;
  color:#000;
  font:inherit;
  font-weight:700;
  font-size:16px;
  cursor:pointer;
}

.foot-cols{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:clamp(24px,5vw,64px);
  margin-top:56px;
}

address{font-style:normal}
address strong{
  display:block;
  font-size:clamp(1.5rem,4vw,2.4rem);
  font-weight:900;
  letter-spacing:-.05em;
  line-height:1;
  margin-bottom:16px;
}
address p{margin:0;color:#9a9a9a;font-size:16px;max-width:42ch}

nav dl{margin:0;display:block}
nav dt{
  font-family:'Fira Code',ui-monospace,monospace;
  font-size:12px;
  letter-spacing:.18em;
  color:#8a8a8a;
  margin:18px 0 4px;
}
nav dt:first-of-type{margin-top:0}
nav dd{margin:0}
nav dd a{display:inline-block;padding:9px 0;font-size:16px;color:#e4e4e4}
nav dd a:hover{text-decoration:underline;text-underline-offset:3px}

.foot-bottom{
  border-top:1px solid #232323;
  margin-top:56px;
  padding-top:26px;
  text-align:center;
}
.foot-bottom ul{
  list-style:none;
  margin:0 0 14px;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:6px 22px;
}
.foot-bottom a{display:inline-block;padding:9px 2px;font-size:16px;color:#cfcfcf}
.foot-bottom a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}

.copy{
  margin:0;
  font-family:'Fira Code',ui-monospace,monospace;
  font-size:13px;
  color:#7a7a7a;
}

/* ===== 回到顶部 ===== */
.totop{
  position:fixed;
  right:16px;
  bottom:104px;
  z-index:55;
  min-height:40px;
  padding:10px 16px;
  border:1px solid #fff;
  border-radius:18px;
  background:#000;
  color:#fff;
  font:inherit;
  font-size:14px;
  cursor:pointer;
  opacity:0;
  pointer-events:none;
  transition:opacity .25s ease;
}
.totop.on{opacity:1;pointer-events:auto}

/* ===== 滚动揭示 ===== */
.rv{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.rv.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none;transition:none}
  .floaty{animation:none}
  aside a{transition:none}
}

/* ===== 窄屏 ===== */
@media (max-width:860px){
  body{font-size:16px;padding-bottom:96px}

  .hero{
    flex-direction:column;
    align-items:stretch;
    min-height:100svh;
    padding:64px 20px 44px;
    gap:32px;
  }
  .hero-copy{flex:none;order:2}
  .hero-copy h1{font-size:clamp(2.2rem,11vw,3.4rem);margin-bottom:22px}
  .lede{font-size:16px}
  .hero-media{flex:none;order:3}
  .hero-media img{height:38vh}

  .floaty{
    position:static;
    order:1;
    align-self:center;
    animation:none;
    font-size:12px;
  }

  main{grid-template-columns:1fr;padding:0 20px}

  aside{
    position:static;
    padding:44px 0 0;
    margin-top:56px;
    border-top:1px solid #232323;
  }

  .flow > div{padding:64px 0}

  .foot{padding:56px 20px 40px;margin-top:64px}
  .foot-cols{grid-template-columns:1fr;gap:36px;margin-top:44px}

  .totop{bottom:96px;font-size:13px}
}

@media (max-width:520px){
  .dock{gap:6px;padding:9px 12px}
  .dock .brand{font-size:17px}
  .dock-group summary{padding:8px 11px;font-size:13px}
  .dock .cta{padding:8px 13px;font-size:14px}
  .dock .cta{max-width:40vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
}

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