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

:root{
  --paper:#F4EFE4;
  --paper-2:#EADFCB;
  --ink:#1F2A37;
  --flame:#E4572E;
  --line:rgba(31,42,55,.16);
  --soft:rgba(31,42,55,.72);
  --warm:#F0A184;
}

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

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:'Patrick Hand','Kalam',"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  font-size:17px;
  line-height:1.75;
  padding-bottom:96px;
  overflow-x:hidden;
}

body::before{
  content:"";
  position:fixed;
  inset:-12% 0 0;
  z-index:0;
  pointer-events:none;
  background:
    radial-gradient(62% 42% at 12% 6%,rgba(228,87,46,.13),transparent 70%),
    radial-gradient(54% 46% at 88% 64%,rgba(31,42,55,.11),transparent 70%);
  will-change:transform;
}

body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background:repeating-linear-gradient(180deg,rgba(31,42,55,.045) 0 1px,transparent 1px 34px);
  opacity:.5;
}

a{color:var(--flame)}

a:focus-visible,button:focus-visible,input:focus-visible{
  outline:3px solid var(--flame);
  outline-offset:2px;
}

.skip{
  position:absolute;
  top:0;left:0;
  z-index:80;
  background:var(--ink);
  color:var(--paper);
  padding:12px 18px;
  text-decoration:none;
  transform:translateY(-130%);
}
.skip:focus{transform:none}

/* 主视觉 */
.hero{
  position:relative;
  min-height:45vh;
  display:grid;
  place-items:center;
  padding:clamp(46px,11vh,84px) 18px clamp(26px,5vh,42px);
  overflow:hidden;
  text-align:center;
  border-bottom:2px solid var(--ink);
  background:linear-gradient(180deg,rgba(244,239,228,0) 58%,rgba(31,42,55,.055));
}

.hero-fig{
  position:relative;
  z-index:2;
  margin:0;
  display:grid;
  gap:16px;
  justify-items:center;
}

.ghost{
  position:absolute;
  top:50%;left:50%;
  margin:0;
  z-index:0;
  font-size:clamp(3.2rem,17vw,11rem);
  font-weight:700;
  line-height:1;
  letter-spacing:.04em;
  color:rgba(31,42,55,.085);
  white-space:nowrap;
  pointer-events:none;
  transform:translate(-50%,-50%) rotate(-3.5deg) translateY(var(--gy,0px));
  will-change:transform;
}

.hero h1{
  position:relative;
  z-index:2;
  margin:0;
  font-size:clamp(2rem,7.4vw,4.4rem);
  line-height:1.14;
  letter-spacing:.02em;
}

.hero h1::after{
  content:"";
  display:block;
  width:66%;
  height:8px;
  margin:14px auto 0;
  background:var(--flame);
  transform:rotate(-1.6deg);
}

.lede{
  margin:0;
  max-width:36ch;
  font-size:1.02rem;
  line-height:1.7;
  color:var(--soft);
}

.hero figcaption{
  font-size:.88rem;
  letter-spacing:.3em;
  color:var(--flame);
}

/* 双栏骨架 */
.grid{
  position:relative;
  z-index:1;
  max-width:1100px;
  margin:0 auto;
  padding:0 clamp(16px,4vw,40px) 92px;
  display:grid;
  grid-template-columns:minmax(0,1fr) 248px;
  gap:clamp(24px,4vw,54px);
  align-items:start;
}

.prose{min-width:0}

.prose > section{
  position:relative;
  padding:clamp(30px,5vw,58px) 0;
  scroll-margin-top:26px;
}

.prose > section + section{border-top:2px dashed var(--line)}

.prose > section:nth-child(even){
  background:rgba(31,42,55,.045);
  box-shadow:0 0 0 clamp(10px,2.6vw,26px) rgba(31,42,55,.045);
}

.prose small{
  display:block;
  margin-bottom:4px;
  font-size:.9rem;
  letter-spacing:.26em;
  color:var(--flame);
}

.prose h2{
  margin:.1em 0 .55em;
  font-size:clamp(1.5rem,3.6vw,2.15rem);
  line-height:1.25;
  letter-spacing:.01em;
}

.prose h2::before{
  content:"";
  display:block;
  width:44px;
  height:7px;
  margin-bottom:14px;
  background:var(--flame);
  transform:rotate(-2deg);
}

.prose h3{
  margin:1.5em 0 .5em;
  font-size:1.22rem;
  line-height:1.35;
}

.prose p{margin:0 0 1.05em;color:rgba(31,42,55,.88)}

.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.35em}
.prose li{margin:.3em 0}

.prose a{
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:2px;
}

.prose img{display:block;max-width:100%;height:auto}

.prose blockquote{
  margin:1.2em 0;
  padding:14px 18px;
  background:var(--ink);
  color:var(--paper);
}
.prose blockquote p{color:inherit}
.prose blockquote p:last-child{margin-bottom:0}

/* 侧栏 */
.side{
  position:sticky;
  top:22px;
  display:grid;
  gap:14px;
  padding-top:clamp(30px,5vw,58px);
  font-size:.95rem;
}

.side-box{
  background:var(--ink);
  color:var(--paper);
  padding:18px 16px 14px;
}

.side-box small{
  display:block;
  font-size:.8rem;
  letter-spacing:.28em;
  color:var(--warm);
}

.side-box h2{
  margin:.15em 0 .7em;
  font-size:1.16rem;
  line-height:1.3;
}

.side-list{list-style:none;margin:0;padding:0;display:grid;gap:1px}

.side-list a{
  display:flex;
  align-items:center;
  gap:8px;
  min-height:40px;
  padding:6px 0;
  color:var(--paper);
  text-decoration:none;
  border-bottom:1px solid rgba(244,239,228,.16);
}
.side-list a:hover{color:var(--warm)}

.dot{
  width:7px;
  height:7px;
  flex:0 0 auto;
  background:var(--flame);
  transform:rotate(45deg);
  transition:transform .18s ease;
}
a:hover .dot{transform:rotate(45deg) scale(1.6)}

.totop{
  display:block;
  min-height:44px;
  line-height:44px;
  text-align:center;
  background:var(--flame);
  color:var(--paper);
  text-decoration:none;
  font-size:.95rem;
  letter-spacing:.16em;
}
.totop:hover{background:var(--ink)}

/* 页脚 */
.foot{
  position:relative;
  z-index:1;
  margin-top:16px;
  padding:clamp(30px,6vw,54px) clamp(16px,4vw,40px) 18px;
  background:var(--ink);
  color:var(--paper);
}

.foot-cols{
  max-width:1100px;
  margin:0 auto;
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,4vw,40px);
}

.foot-col small{
  display:block;
  font-size:.8rem;
  letter-spacing:.28em;
  color:var(--warm);
}

.foot-col h3{margin:.2em 0 .7em;font-size:1.12rem}

.foot address{
  font-style:normal;
  font-size:1.3rem;
  letter-spacing:.12em;
}

.sub{display:flex;gap:8px}

.sub input{
  flex:1 1 auto;
  min-width:0;
  min-height:44px;
  padding:8px 10px;
  font:inherit;
  font-size:1rem;
  color:var(--paper);
  background:transparent;
  border:2px solid rgba(244,239,228,.32);
}
.sub input::placeholder{color:rgba(244,239,228,.6)}

.sub button{
  min-height:44px;
  padding:0 16px;
  font:inherit;
  font-size:1rem;
  border:0;
  background:var(--flame);
  color:var(--paper);
  cursor:pointer;
}
.sub button:hover{background:#c9461f}

.foot-sec{list-style:none;margin:0;padding:0}
.foot-sec a{
  display:inline-block;
  min-height:40px;
  line-height:40px;
  color:var(--paper);
  text-decoration:none;
}
.foot-sec a:hover{color:var(--warm)}

.foot-bar{
  max-width:1100px;
  margin:26px auto 0;
  padding-top:14px;
  border-top:1px solid rgba(244,239,228,.22);
  display:flex;
  flex-wrap:wrap;
  gap:10px 18px;
  align-items:center;
  justify-content:space-between;
}
.foot-bar p{margin:0;font-size:.95rem;letter-spacing:.06em}

.foot-ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:2px 16px}
.foot-ul a{
  display:inline-block;
  min-height:40px;
  line-height:40px;
  color:var(--paper);
  text-decoration:none;
}
.foot-ul a:hover{color:var(--warm)}

/* 底部固定条 */
.dock{
  position:fixed;
  left:0;right:0;bottom:0;
  z-index:60;
  display:grid;
  grid-template-columns:1fr auto 1fr;
  align-items:center;
  gap:10px;
  padding:7px clamp(10px,2.6vw,26px);
  background:var(--paper);
  border-top:2px solid var(--ink);
  box-shadow:0 -6px 0 rgba(31,42,55,.06);
}

.dock ol{list-style:none;margin:0;padding:0;display:flex;gap:2px}
.dock-l{justify-content:flex-end}
.dock-r{justify-content:flex-start}

.dock a{
  display:inline-flex;
  align-items:center;
  gap:7px;
  min-height:44px;
  padding:0 9px;
  font-size:1rem;
  color:var(--ink);
  text-decoration:none;
  white-space:nowrap;
}
.dock a:hover{color:var(--flame)}

.dock-mid{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
}

.brand{
  font-size:1.16rem;
  font-weight:700;
  letter-spacing:.14em;
  padding:0 4px;
}
.brand:hover{color:var(--flame)}

.find{
  display:flex;
  align-items:center;
  gap:6px;
  padding-left:10px;
  border-left:2px solid var(--line);
}

.find input{
  width:104px;
  min-height:40px;
  padding:4px 2px;
  font:inherit;
  font-size:1rem;
  color:var(--ink);
  background:transparent;
  border:0;
  border-bottom:2px dashed rgba(31,42,55,.35);
}
.find input::placeholder{color:rgba(31,42,55,.5)}

.find button{
  min-height:40px;
  padding:0 11px;
  font:inherit;
  font-size:1rem;
  border:0;
  background:var(--flame);
  color:var(--paper);
  cursor:pointer;
}
.find button:hover{background:var(--ink)}

/* 滚动渐显 */
.js .prose > section{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .62s ease,transform .62s ease;
}
.js .prose > section.in{opacity:1;transform:none}

@media (max-width:900px){
  .grid{grid-template-columns:minmax(0,1fr)}
  .side{position:static;padding-top:0}
  .foot-cols{grid-template-columns:1fr 1fr}
  .foot-col:first-child{grid-column:1/-1}
}

@media (max-width:760px){
  .dock{
    display:flex;
    flex-wrap:nowrap;
    justify-content:flex-start;
    gap:2px;
    overflow-x:auto;
    padding:6px 8px;
    -webkit-overflow-scrolling:touch;
  }
  .dock-mid{order:-1;flex:0 0 auto;gap:8px}
  .dock ol{flex:0 0 auto}
  .dock-l{justify-content:flex-start}
  .find input{width:76px}
  .brand{font-size:1.05rem}
}

@media (max-width:520px){
  body{font-size:16px}
  .foot-cols{grid-template-columns:1fr}
  .foot-col:first-child{grid-column:auto}
  .prose > section{padding:30px 0}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *{transition-duration:.01ms!important;animation-duration:.01ms!important}
  .js .prose > section{opacity:1;transform:none;transition:none}
  .ghost{transform:translate(-50%,-50%) rotate(-3.5deg)}
}

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