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

:root{
  --cream:#f5e6c8;
  --tan:#d4a574;
  --ink:#262117;
  --paper:#fbf4e4;
  --dim:#7c6a50;
  --line:rgba(38,33,23,.22);
  --mono:'Roboto Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:'Exo','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%;
}

body{
  margin:0;
  background:var(--cream);
  color:var(--ink);
  font:17px/1.78 var(--sans);
  letter-spacing:.01em;
  overflow-x:hidden;
  position:relative;
}

body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:60;
  pointer-events:none;
  opacity:.11;
  mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:58;
  pointer-events:none;
  opacity:.5;
  mix-blend-mode:multiply;
  background:
    radial-gradient(58% 42% at 6% 0%,rgba(212,165,116,.55),transparent 72%),
    radial-gradient(38% 38% at 100% 10%,rgba(245,206,148,.5),transparent 74%),
    radial-gradient(52% 36% at 32% 100%,rgba(174,116,68,.18),transparent 76%);
  animation:leak 18s ease-in-out infinite alternate;
}

@keyframes leak{
  to{opacity:.34;transform:translate3d(0,-8px,0)}
}

img{max-width:100%;display:block}
a{color:var(--ink);text-decoration:none}
a:hover{color:var(--ink)}

/* 顶部 */
.top{
  position:sticky;
  top:0;
  z-index:30;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.4rem;
  padding:.55rem .9rem;
  background:rgba(245,230,200,.95);
  border-bottom:1px solid var(--ink);
  backdrop-filter:blur(4px);
}

.brand{
  display:grid;
  place-items:center;
  min-width:44px;
  min-height:44px;
  padding:.2rem .5rem;
  border:1px solid var(--ink);
  background:var(--paper);
}

.mark-img{width:26px;height:26px;object-fit:contain}
.mark-txt{font:600 1rem/1 var(--mono);letter-spacing:.02em}

.menu{
  display:flex;
  align-items:center;
  gap:.15rem;
  margin-left:auto;
}

.group{position:relative}

.group-btn{
  min-height:44px;
  padding:.8rem .6rem;
  border:0;
  border-bottom:2px solid transparent;
  background:none;
  color:var(--ink);
  font:500 15px/1 var(--mono);
  letter-spacing:.1em;
  cursor:pointer;
}

.group-btn:hover,
.group:focus-within .group-btn{border-bottom-color:var(--tan)}

.drop{
  position:absolute;
  right:0;
  top:100%;
  display:none;
  flex-direction:column;
  min-width:11.5rem;
  padding:.35rem;
  background:var(--paper);
  border:1px solid var(--ink);
  border-top:3px solid var(--tan);
}

.group:hover .drop,
.group:focus-within .drop{display:flex}

.drop a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:.6rem .7rem;
  font:400 15px/1.3 var(--mono);
  border-bottom:1px solid rgba(38,33,23,.12);
}

.drop a:last-child{border-bottom:0}
.drop a:hover{background:var(--cream)}

.call{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:.7rem .8rem;
  margin-left:.2rem;
  border:1px solid var(--ink);
  font:500 14px/1 var(--mono);
  letter-spacing:.12em;
}

.call:hover{background:var(--ink);color:var(--cream)}

/* 主视觉 */
.hero{
  display:flex;
  flex-direction:column;
  min-height:70vh;
  margin:0;
}

.hero-copy{
  width:100%;
  max-width:1120px;
  margin:0 auto;
  padding:1.7rem 1rem 1.1rem;
}

.hero h1{
  margin:0;
  font:600 clamp(1.9rem,8vw,3.5rem)/1.08 var(--mono);
  letter-spacing:-.02em;
  text-shadow:0 1px 0 rgba(251,244,228,.7);
}

.hero-stage{
  position:relative;
  flex:1 1 auto;
  min-height:46vh;
  margin:0;
  padding:12px 12px 38px;
  overflow:hidden;
  background:linear-gradient(155deg,#efe0c0,#d4a574 58%,#8a6b43);
  border-top:1px solid var(--ink);
  border-bottom:1px solid var(--ink);
}

.hero-shot{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:sepia(.24) contrast(1.07) saturate(.8);
  will-change:transform;
  transform:scale(1.07);
}

.hero-stage::before{
  content:"";
  position:absolute;
  left:0;
  right:0;
  top:-25%;
  height:22%;
  z-index:2;
  pointer-events:none;
  background:linear-gradient(180deg,transparent,rgba(255,241,213,.32),transparent);
  animation:track 9s linear infinite;
}

.hero-stage::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:1;
  pointer-events:none;
  background:repeating-linear-gradient(180deg,rgba(255,255,255,.07) 0 2px,transparent 2px 4px);
  mix-blend-mode:overlay;
}

@keyframes track{
  0%{top:-25%}
  100%{top:106%}
}

/* 主体 */
.shell{
  max-width:1180px;
  margin:0 auto;
  padding:2.2rem 1.1rem 3rem;
}

main section[id]{scroll-margin-top:5.6rem}

.rail{
  margin-bottom:2rem;
  padding-top:.85rem;
  border-top:3px solid var(--ink);
}

.eyebrow{
  display:block;
  margin-bottom:.5rem;
  color:var(--dim);
  font:500 12px/1 var(--mono);
  letter-spacing:.26em;
}

.rail-title{
  margin:0 0 .8rem;
  font:600 1.15rem/1.3 var(--mono);
  letter-spacing:.02em;
}

.rail-list{
  list-style:none;
  margin:0;
  padding:0;
  border-top:1px solid var(--line);
}

.rail-list li{border-bottom:1px solid var(--line)}

.rail-list a{
  display:flex;
  align-items:baseline;
  gap:.7rem;
  min-height:44px;
  padding:.72rem .2rem;
  font-size:15px;
  line-height:1.4;
}

.rail-list a:hover{background:rgba(212,165,116,.3)}

.num{
  font:400 12px/1 var(--mono);
  color:var(--dim);
  letter-spacing:.1em;
}

/* 正文 */
.prose{
  min-width:0;
  max-width:42em;
}

.prose section{
  padding-bottom:2rem;
  margin-bottom:2.4rem;
  border-bottom:3px solid rgba(212,165,116,.9);
}

.prose section:last-child,
.prose section:last-of-type{border-bottom:0;margin-bottom:0;padding-bottom:0}

.prose h2{
  margin:2.2rem 0 .8rem;
  font:600 clamp(1.3rem,4.4vw,1.8rem)/1.28 var(--mono);
  letter-spacing:-.01em;
}

.prose h3{
  margin:1.7rem 0 .55rem;
  font:600 1.1rem/1.4 var(--mono);
  color:#3a3122;
}

.prose p{margin:0 0 1.05rem}
.prose ul,.prose ol{margin:0 0 1.05rem;padding-left:1.35rem}
.prose li{margin:.32rem 0}

.prose blockquote{
  margin:1.3rem 0;
  padding:.55rem 0 .55rem 1rem;
  border-left:3px solid var(--tan);
  color:#4b3f2d;
}

.prose img{
  margin:1.1rem 0;
  background:var(--paper);
  border:1px solid var(--line);
  filter:sepia(.2) contrast(1.05) saturate(.85);
}

.prose table{
  width:100%;
  margin:1.1rem 0;
  border-collapse:collapse;
  font-size:15px;
}

.prose th,.prose td{
  padding:.55rem .6rem;
  border:1px solid var(--line);
  text-align:left;
  vertical-align:top;
}

.prose th{background:rgba(212,165,116,.28);font-weight:600}

.prose a{border-bottom:1px solid var(--tan)}
.prose a:hover{background:rgba(212,165,116,.35)}

.prose strong{font-weight:600}
.prose code,.prose pre{font-family:var(--mono);font-size:14px}

.prose pre{
  padding:.9rem;
  overflow-x:auto;
  background:var(--paper);
  border:1px solid var(--line);
}

/* 页脚 */
.foot{
  margin-top:2rem;
  padding:1.6rem 1.1rem 1.2rem;
  border-top:3px solid var(--ink);
  background:#efe0c0;
}

.foot-brand{
  display:flex;
  align-items:center;
  gap:.6rem;
  margin-bottom:1.1rem;
}

.mark{
  display:grid;
  place-items:center;
  min-width:44px;
  min-height:44px;
  border:1px solid var(--ink);
  background:var(--paper);
}

.foot-name{
  font:600 1rem/1.2 var(--mono);
  letter-spacing:.06em;
}

.foot-nav dl{
  display:grid;
  grid-template-columns:2.2rem minmax(0,1fr);
  gap:.15rem .55rem;
  align-items:center;
  margin:0 0 1.2rem;
}

.foot-nav dt{
  font:400 11px/1 var(--mono);
  letter-spacing:.1em;
  color:var(--dim);
}

.foot-nav dd{margin:0}

.foot-nav a{
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:.2rem 0;
  font-size:15px;
  border-bottom:1px solid transparent;
}

.foot-nav a:hover{border-bottom-color:var(--tan)}

.foot-sub{margin-bottom:1.1rem}

.foot-sub label{
  display:block;
  margin-bottom:.45rem;
  color:var(--dim);
  font:500 12px/1 var(--mono);
  letter-spacing:.18em;
}

.foot-sub .row{display:flex;gap:.4rem;flex-wrap:wrap}

.foot-sub input{
  flex:1 1 8rem;
  min-width:0;
  min-height:44px;
  padding:.5rem .6rem;
  border:1px solid var(--ink);
  background:var(--paper);
  color:var(--ink);
  font:400 15px/1 var(--mono);
}

.foot-sub input:focus{outline:2px solid var(--tan);outline-offset:1px}

.foot-sub button{
  min-height:44px;
  padding:.5rem 1rem;
  border:1px solid var(--ink);
  background:var(--ink);
  color:var(--cream);
  font:500 14px/1 var(--mono);
  letter-spacing:.12em;
  cursor:pointer;
}

.foot-sub button:hover{background:#3b3425}

.foot-end{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding-top:.9rem;
  border-top:1px solid var(--line);
}

.copy{
  margin:0;
  color:var(--dim);
  font:400 12px/1.6 var(--mono);
  letter-spacing:.06em;
}

.up{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:.4rem .7rem;
  border:1px solid var(--line);
  font:500 13px/1 var(--mono);
  letter-spacing:.1em;
}

.up:hover{border-color:var(--ink);background:var(--paper)}

/* 断点 */
@media (max-width:859px){
  .menu{width:100%;justify-content:flex-start;border-top:1px solid var(--line);margin-top:.4rem;padding-top:.35rem}
  .drop{position:static;right:auto;top:auto;min-width:0;width:100%;margin:.15rem 0 .4rem;border:1px solid var(--ink);border-top:3px solid var(--tan)}
  .group{position:static}
  .call{margin-left:auto}
  .hero-stage{min-height:38vh}
  .hero{min-height:auto}
}

@media (min-width:900px){
  .shell{
    display:grid;
    grid-template-columns:238px minmax(0,1fr);
    gap:3rem;
    align-items:start;
  }
  .rail{
    position:sticky;
    top:5.4rem;
    align-self:start;
    margin-bottom:0;
  }
  .hero-copy{padding:2.4rem 1.2rem 1.6rem}
}

@media (min-width:760px){
  .foot{
    display:flex;
    flex-wrap:wrap;
    gap:1.4rem 2.2rem;
    align-items:flex-start;
  }
  .foot-brand{margin-bottom:0;flex:0 0 auto}
  .foot-nav{flex:1 1 22rem}
  .foot-nav dl{grid-template-columns:2.2rem minmax(0,1fr) 2.2rem minmax(0,1fr)}
  .foot-sub{flex:0 1 17rem;margin-bottom:0}
  .foot-end{flex-basis:100%;margin-top:.8rem}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  body::after,.hero-stage::before{animation:none}
  .hero-shot{transform:none}
  *{transition:none !important}
}

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