@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;700;900&display=swap');

:root{
  --ink:#111014;
  --hot:#FF4D18;
  --paper:#F2EDE6;
  --dim:rgba(242,237,230,.62);
  --faint:rgba(242,237,230,.14);
  --card:#1B1A20;
  --r:10px;
  --pad:clamp(18px,5vw,42px);
}

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

html{
  scroll-behavior:smooth;
  font-size:17px;
  background:var(--ink);
  color:var(--paper);
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  background:var(--ink);
  color:var(--paper);
  font-family:'Outfit',system-ui,-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  font-size:17px;
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

img{max-width:100%;height:auto;display:block}
a{color:var(--paper);text-decoration:none}
menu{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{text-wrap:balance}

/* 顶栏 */
.bar{
  position:sticky;
  top:0;
  z-index:40;
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:64px;
  padding:0 var(--pad);
  background:rgba(17,16,20,.94);
  border-bottom:1px solid var(--faint);
  backdrop-filter:blur(10px);
}

.burger{position:relative;margin:0}
.burger summary{
  position:relative;
  z-index:60;
  display:flex;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:8px 2px;
  cursor:pointer;
  list-style:none;
}
.burger summary::-webkit-details-marker{display:none}
.bars{display:grid;gap:4px}
.bars i{display:block;width:22px;height:2px;background:var(--paper);transition:transform .25s ease,opacity .2s ease,background .2s ease}
.burger[open] .bars i:nth-child(1){transform:translateY(6px) rotate(45deg);background:var(--hot)}
.burger[open] .bars i:nth-child(2){opacity:0}
.burger[open] .bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg);background:var(--hot)}
.btxt{font-size:16px;letter-spacing:.12em;color:var(--dim)}
.burger[open] .btxt{color:var(--hot)}

.burger:not([open]) .sheet{display:none}
.sheet{
  position:fixed;
  inset:0;
  z-index:50;
  display:grid;
  align-content:start;
  gap:2px;
  padding:96px var(--pad) 44px;
  overflow:auto;
  overscroll-behavior:contain;
  background:var(--ink);
  border-top:3px solid var(--hot);
  animation:sheetIn .28s ease both;
}
.sheet li a{
  display:flex;
  align-items:baseline;
  gap:12px;
  min-height:48px;
  padding:14px 0;
  border-bottom:1px solid var(--faint);
  font-size:clamp(21px,5.6vw,32px);
  font-weight:700;
  line-height:1.28;
  letter-spacing:-.01em;
  transition:color .18s ease,transform .18s ease;
}
.sheet li a:hover,.sheet li a:focus-visible{color:var(--hot);transform:translateX(6px)}
.sheet .num{font-size:12px;font-weight:500;letter-spacing:.22em;color:var(--hot);flex:0 0 auto}

.mark{
  position:absolute;
  left:50%;
  transform:translateX(-50%);
  display:flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:8px 6px;
  max-width:64vw;
  font-size:16px;
  font-weight:900;
  letter-spacing:.05em;
  white-space:nowrap;
}
.mark-ico{width:26px;height:26px;border-radius:6px;object-fit:cover}
.mark-txt{overflow:hidden;text-overflow:ellipsis}

/* 栅格 */
.wrap{
  display:grid;
  grid-template-columns:190px minmax(0,1fr);
  gap:clamp(20px,4vw,52px);
  align-items:start;
  max-width:1160px;
  margin:0 auto;
  padding:26px var(--pad) 64px;
}

.side{position:sticky;top:84px;font-size:15px}
.side-h{
  margin:0 0 12px;
  font-size:13px;
  font-weight:500;
  letter-spacing:.2em;
  line-height:1.5;
  color:var(--dim);
}
.side-h > span{position:relative;z-index:0;display:inline-block;color:var(--hot)}
.side-list li a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:6px 0;
  color:var(--dim);
  border-bottom:1px dashed var(--faint);
  transition:color .18s ease,padding-left .18s ease;
}
.side-list li a:hover,.side-list li a:focus-visible{color:var(--paper);padding-left:8px}

/* 正文 */
.doc{font-size:17px;line-height:1.75}

.hero{
  display:flex;
  flex-direction:column;
  justify-content:flex-end;
  gap:14px;
  min-height:45vh;
  padding:20px 0 26px;
  border-bottom:3px solid var(--hot);
}
.hero .no{
  font-size:13px;
  font-weight:700;
  letter-spacing:.34em;
  color:var(--hot);
}
.big{
  margin:0;
  font-size:clamp(30px,7.4vw,62px);
  font-weight:900;
  line-height:1.07;
  letter-spacing:-.02em;
}
.big span{display:inline-block;will-change:transform}
.big span.ch{animation:pop .52s cubic-bezier(.2,.7,.3,1) both}
.hero-img{
  width:100%;
  max-height:38vh;
  object-fit:cover;
  border-radius:var(--r);
  filter:contrast(1.06) saturate(1.05);
  background:var(--card);
}

.doc > div{
  padding:46px 0 40px;
  border-top:1px solid var(--faint);
  scroll-margin-top:84px;
}

.doc h2{
  margin:.2em 0 .65em;
  font-size:clamp(23px,4.3vw,38px);
  font-weight:900;
  line-height:1.18;
  letter-spacing:-.02em;
}
.doc h3{
  margin:1.5em 0 .5em;
  font-size:clamp(19px,3.2vw,25px);
  font-weight:700;
  line-height:1.3;
  letter-spacing:-.01em;
}
.doc h2 > span,.doc h3 > span{position:relative;z-index:0;display:inline-block}
.doc h2 > span::after{
  content:"";
  position:absolute;
  z-index:-1;
  left:-.04em;
  right:-.04em;
  bottom:.02em;
  height:.26em;
  background:var(--hot);
  border-radius:2px;
  opacity:.9;
}
.doc h3 > span{border-bottom:2px solid var(--hot);padding-bottom:2px}

.doc p{margin:0 0 1.05em}
.doc strong,.doc b{color:#fff;font-weight:700}
.doc a{color:var(--hot);text-decoration:underline;text-underline-offset:3px;text-decoration-thickness:1px}
.doc a:hover{background:var(--hot);color:var(--ink);text-decoration:none}
.doc ul,.doc ol{margin:0 0 1.15em;padding-left:1.35em}
.doc li{margin:.34em 0}
.doc li::marker{color:var(--hot)}
.doc blockquote{
  margin:1.5em 0;
  padding:18px 20px;
  background:var(--card);
  border-left:4px solid var(--hot);
  border-radius:var(--r);
  color:var(--paper);
}
.doc blockquote p:last-child{margin:0}
.doc figure{margin:1.4em 0}
.doc figcaption{font-size:14px;color:var(--dim);margin-top:8px}
.doc img{border-radius:var(--r);margin:1.1em 0;background:var(--card)}
.doc hr{border:0;border-top:1px solid var(--faint);margin:2em 0}
.doc table{width:100%;border-collapse:collapse;margin:1.2em 0;font-size:15px}
.doc th,.doc td{padding:10px 12px;text-align:left;border-bottom:1px solid var(--faint)}
.doc th{color:var(--hot);font-weight:700}
.doc code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:14px;
  background:var(--card);
  padding:2px 6px;
  border-radius:6px;
}
.doc pre{
  overflow-x:auto;
  padding:16px;
  background:var(--card);
  border-radius:var(--r);
  line-height:1.6;
}
.doc pre code{background:none;padding:0}

/* 滚动揭示 */
.rv{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s ease}
.rv.in{opacity:1;transform:none}

/* 页脚 */
footer{margin-top:30px;border-top:1px solid var(--faint)}
.fcta{
  padding:58px var(--pad) 50px;
  text-align:center;
  background:var(--hot);
  color:var(--ink);
}
.fcta h2{
  margin:0 0 22px;
  font-size:clamp(26px,6.2vw,54px);
  font-weight:900;
  line-height:1.08;
  letter-spacing:-.02em;
}
.fcta h2 > span{display:inline-block}
.cta-btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:48px;
  padding:12px 36px;
  border-radius:999px;
  background:var(--ink);
  color:var(--paper);
  font-size:17px;
  font-weight:700;
  letter-spacing:.16em;
  transition:transform .2s ease,background .2s ease;
}
.cta-btn:hover,.cta-btn:focus-visible{transform:translateY(-3px);background:#000}

.fnav{padding:34px var(--pad) 12px}
.fnav menu{display:grid;grid-template-columns:repeat(auto-fit,minmax(148px,1fr));gap:0 22px}
.fnav a{
  display:flex;
  align-items:center;
  min-height:44px;
  padding:10px 0;
  color:var(--dim);
  font-size:16px;
  border-bottom:1px dashed var(--faint);
  transition:color .18s ease;
}
.fnav a:hover,.fnav a:focus-visible{color:var(--hot)}

.fbot{
  padding:20px var(--pad) 30px;
  text-align:center;
  color:var(--dim);
  font-size:14px;
  border-top:1px solid var(--faint);
  margin-top:20px;
}
.fbot p{margin:0}

@keyframes pop{
  from{opacity:0;transform:translateY(.34em) rotate(2deg)}
  to{opacity:1;transform:none}
}
@keyframes sheetIn{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:none}
}

:focus-visible{outline:2px solid var(--hot);outline-offset:3px}

@media (min-width:821px){
  .sheet{grid-template-columns:1fr 1fr;column-gap:clamp(24px,5vw,64px);max-width:960px;margin:0 auto;padding-top:130px}
}

@media (max-width:820px){
  .wrap{grid-template-columns:minmax(0,1fr);padding-top:16px}
  .side{position:static;top:auto}
  .side-h{margin-bottom:9px}
  .side-list{display:flex;gap:8px;overflow-x:auto;padding-bottom:6px;scrollbar-width:none}
  .side-list::-webkit-scrollbar{display:none}
  .side-list li a{
    white-space:nowrap;
    min-height:40px;
    padding:8px 14px;
    background:var(--card);
    border:0;
    border-radius:999px;
    color:var(--paper);
    font-size:15px;
  }
  .side-list li a:hover{padding-left:14px;color:var(--hot)}
  .hero{min-height:auto;padding-top:12px}
  .doc > div{padding:36px 0 30px}
}

@media (max-width:420px){
  .mark{font-size:15px}
  .btxt{display:none}
  .fcta{padding:44px var(--pad) 40px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv{opacity:1;transform:none}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
  }
}

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