:root{
  --ink:#0F1B2B;
  --hot:#FF4D3D;
  --cream:#F2E9DC;
  --line:rgba(15,27,43,.16);
  --soft:rgba(242,233,220,.16);
  --pad:clamp(16px,4vw,40px);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--cream);
  color:var(--ink);
  font-family:'Lato',-apple-system,BlinkMacSystemFont,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  font-size:17px;
  line-height:1.7;
  font-weight:400;
}
h1,h2,h3{
  font-family:'EB Garamond',Georgia,'Songti SC','Times New Roman',serif;
  font-weight:700;
  line-height:1.16;
  margin:0;
  letter-spacing:-.01em;
}
p{margin:0 0 1em}
img{max-width:100%}
a{color:var(--hot)}
menu,ul,ol{margin:0;padding:0;list-style:none}
[id]{scroll-margin-top:120px}
:focus-visible{outline:3px solid var(--hot);outline-offset:2px}

/* 顶部细条 */
.strip{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding:2px var(--pad);
  background:var(--hot);
  color:var(--ink);
  font-size:16px;
  font-weight:700;
  letter-spacing:.06em;
}
.strip-mark{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.skip{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:0 4px;
  color:var(--ink);
  text-decoration:underline;
  text-underline-offset:3px;
  white-space:nowrap;
}

/* 固定头部 */
.topbar{position:sticky;top:0;z-index:60;background:var(--cream)}
.top{
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:8px;
  padding:8px var(--pad);
  background:var(--ink);
  color:var(--cream);
  border-bottom:3px solid var(--hot);
}
.brand{
  justify-self:center;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 8px;
  color:var(--cream);
  text-decoration:none;
  font-family:'EB Garamond',Georgia,'Songti SC',serif;
  font-weight:700;
  font-size:20px;
  letter-spacing:.06em;
  white-space:nowrap;
}
.brand:hover{color:var(--hot)}
.dd{position:relative}
.dd-l{justify-self:start}
.dd-r{justify-self:end}
.dd summary{
  display:inline-flex;
  align-items:center;
  gap:6px;
  min-height:44px;
  padding:0 12px;
  cursor:pointer;
  list-style:none;
  border:2px solid rgba(242,233,220,.4);
  border-radius:4px;
  color:var(--cream);
  font-size:16px;
  font-weight:700;
  letter-spacing:.08em;
  transition:background .16s ease,color .16s ease,border-color .16s ease;
}
.dd summary::-webkit-details-marker{display:none}
.dd summary::after{content:"+";font-weight:700}
.dd[open] summary::after{content:"–"}
.dd summary:hover{background:var(--hot);border-color:var(--hot);color:var(--ink)}
.dd-menu{
  position:absolute;
  top:calc(100% + 6px);
  left:0;
  display:none;
  min-width:190px;
  padding:6px;
  background:var(--cream);
  border:2px solid var(--ink);
  border-radius:4px;
  z-index:70;
}
.dd-menu-r{left:auto;right:0}
.dd[open]>.dd-menu{display:block}
.dd-menu a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:0 12px;
  border-radius:2px;
  color:var(--ink);
  text-decoration:none;
  font-size:16px;
  font-weight:700;
  transition:background .16s ease,color .16s ease;
}
.dd-menu a:hover{background:var(--ink);color:var(--cream)}

/* 锚点条 */
.anchors{
  background:var(--cream);
  border-bottom:2px solid var(--ink);
}
.anchors ul{
  display:flex;
  gap:2px;
  padding:0 var(--pad);
  overflow-x:auto;
  scrollbar-width:thin;
}
.anchors a{
  display:flex;
  align-items:center;
  min-height:46px;
  padding:0 14px;
  color:var(--ink);
  text-decoration:none;
  font-size:16px;
  font-weight:700;
  white-space:nowrap;
  border-bottom:4px solid transparent;
  transition:background .16s ease,color .16s ease,border-color .16s ease;
}
.anchors a:hover{background:var(--ink);color:var(--cream);border-color:var(--hot)}

/* 首屏 */
.wrap{width:100%}
.hero{
  display:grid;
  place-items:center;
  min-height:100svh;
  padding:48px 0;
  background-color:var(--ink);
  background-image:radial-gradient(rgba(242,233,220,.17) 1.5px,transparent 1.5px);
  background-size:22px 22px;
  color:var(--cream);
  overflow:hidden;
}
.hero-in{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 var(--pad);
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:clamp(24px,4vw,56px);
  align-items:center;
}
.kicker{
  display:inline-block;
  margin:0 0 18px;
  padding:4px 10px;
  background:var(--hot);
  color:var(--ink);
  font-size:16px;
  font-weight:700;
  letter-spacing:.16em;
}
.hero h1{
  font-size:clamp(2.1rem,6.4vw,4.1rem);
  letter-spacing:-.02em;
}
.lede{
  margin:20px 0 0;
  max-width:32em;
  font-size:18px;
  color:rgba(242,233,220,.86);
}
.collage{position:relative;padding-bottom:44px}
.collage img{
  display:block;
  height:auto;
  border-radius:4px;
  object-fit:cover;
}
.collage img:first-child{width:88%;aspect-ratio:4/3}
.collage img+img{
  position:absolute;
  right:0;
  bottom:0;
  width:56%;
  aspect-ratio:1/1;
  border:6px solid var(--ink);
}

/* 正文区 */
.body{
  max-width:1180px;
  margin:0 auto;
  display:grid;
  grid-template-columns:252px minmax(0,1fr);
  align-items:start;
  border-bottom:2px solid var(--ink);
}
.side{
  position:sticky;
  top:126px;
  padding:24px 18px;
  background:var(--ink);
  color:var(--cream);
}
.side h2{
  font-size:19px;
  letter-spacing:.16em;
  color:var(--hot);
  margin-bottom:12px;
}
.side li{
  display:flex;
  gap:10px;
  align-items:baseline;
  border-top:1px solid var(--soft);
  counter-increment:sd;
}
.side ol{counter-reset:sd}
.side li::before{
  content:counter(sd,decimal-leading-zero);
  font-size:14px;
  color:var(--hot);
  font-weight:700;
  flex:0 0 auto;
}
.side li:first-child{border-top:0}
.side a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:6px 0;
  color:var(--cream);
  text-decoration:none;
  font-size:16px;
  line-height:1.4;
  transition:color .16s ease,padding-left .16s ease;
}
.side a:hover{color:var(--hot);padding-left:4px}

.content{
  min-width:0;
  padding:clamp(28px,4vw,48px) clamp(18px,4vw,44px) 64px;
}
.content>:first-child{margin-top:0}
.content div{
  padding-bottom:30px;
  border-bottom:2px solid var(--line);
  margin-bottom:30px;
}
.content div:last-child{border-bottom:0;margin-bottom:0}
.content h2{
  font-size:clamp(1.5rem,3.6vw,2.1rem);
  margin:34px 0 14px;
}
.content h3{
  font-size:clamp(1.2rem,2.6vw,1.45rem);
  margin:26px 0 10px;
}
.content h2 span,.content h3 span{
  display:inline-block;
  border-left:10px solid var(--hot);
  padding-left:12px;
}
.content p,.content li{max-width:38em}
.content ul,.content ol{margin:0 0 1.1em;padding-left:1.3em}
.content ul{list-style:square}
.content ol{list-style:decimal}
.content li{margin:.35em 0}
.content a{
  color:var(--ink);
  text-decoration:underline;
  text-decoration-color:var(--hot);
  text-decoration-thickness:2px;
  text-underline-offset:3px;
}
.content a:hover{background:var(--hot);color:var(--ink);text-decoration-color:var(--ink)}
.content strong{font-weight:700}
.content blockquote{
  margin:1.4em 0;
  padding:14px 18px;
  border-left:10px solid var(--ink);
  background:rgba(15,27,43,.06);
}
.content blockquote p:last-child{margin-bottom:0}
.content img{border-radius:4px;height:auto}

/* 页脚 */
.foot{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:28px 40px;
  padding:48px var(--pad) 28px;
  background:var(--ink);
  color:var(--cream);
}
.foot-brand h2{
  font-size:clamp(2.1rem,7.5vw,4.6rem);
  line-height:1;
  letter-spacing:-.03em;
  word-break:break-word;
}
.foot-nav h2{
  font-size:18px;
  letter-spacing:.18em;
  color:var(--hot);
  margin-bottom:12px;
}
.foot-nav ul{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0 16px;
}
.foot-nav a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:4px 0;
  color:var(--cream);
  text-decoration:none;
  font-size:16px;
  transition:color .16s ease,transform .16s ease;
}
.foot-nav a:hover{color:var(--hot);transform:translateX(3px)}
.copy{
  grid-column:1/-1;
  margin:16px 0 0;
  padding-top:14px;
  border-top:1px solid rgba(242,233,220,.22);
  font-size:16px;
  color:rgba(242,233,220,.72);
}

@media (min-width:900px){
  .anchors ul{justify-content:center}
}

@media (max-width:860px){
  .hero{min-height:auto;padding:40px 0 48px}
  .hero-in{grid-template-columns:1fr;gap:28px}
  .collage{padding-bottom:36px}
  .body{grid-template-columns:1fr}
  .side{position:static;padding:18px var(--pad)}
  .side ol{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}
  .side li:nth-child(2){border-top:0}
  .foot{grid-template-columns:1fr}
}

@media (max-width:560px){
  body{font-size:16px}
  .brand{font-size:17px;letter-spacing:.02em;padding:0 4px}
  .dd summary{padding:0 10px;letter-spacing:.04em}
  .collage img:first-child{width:100%;aspect-ratio:16/11}
  .collage img+img{width:48%;border-width:4px;bottom:0}
  .collage{padding-bottom:24px}
  .foot-nav ul{grid-template-columns:1fr 1fr}
  .side ol{grid-template-columns:1fr}
  .side li:nth-child(2){border-top:1px solid var(--soft)}
}

@media (prefers-reduced-motion:no-preference){
  @keyframes rise{
    from{opacity:0;transform:translateY(14px)}
    to{opacity:1;transform:none}
  }
  .hero-txt,.collage{animation:rise .5s ease both}
  .collage{animation-delay:.1s}
  .content div{animation:rise .5s ease both}
  .content div:nth-child(1){animation-delay:.02s}
  .content div:nth-child(2){animation-delay:.06s}
  .content div:nth-child(3){animation-delay:.1s}
  .content div:nth-child(4){animation-delay:.14s}
  .content div:nth-child(5){animation-delay:.18s}
  .content div:nth-child(6){animation-delay:.22s}
  .content div:nth-child(7){animation-delay:.26s}
  .side li{animation:rise .4s ease both}
  .side li:nth-child(2){animation-delay:.04s}
  .side li:nth-child(3){animation-delay:.08s}
  .side li:nth-child(4){animation-delay:.12s}
  .side li:nth-child(5){animation-delay:.16s}
  .side li:nth-child(6){animation-delay:.2s}
  .side li:nth-child(7){animation-delay:.24s}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition-duration:.01ms!important;animation-duration:.01ms!important}
}

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