@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;700;900&display=swap');
:root{
  --ink:#1B1A17;
  --acc:#C0501E;
  --paper:#F2EAD9;
  --line:rgba(27,26,23,.15);
  --mute:#585246;
  --font:'Outfit',ui-sans-serif,system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font);
  font-size:17px;
  line-height:1.7;
  overflow-x:hidden;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit}
p{margin:0}

/* ===== header ===== */
.head{
  position:sticky;
  top:0;
  z-index:60;
  background:var(--ink);
  color:var(--paper);
  border-bottom:3px solid var(--acc);
}
.head-top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:8px 18px 0;
}
.brand{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  text-decoration:none;
  font-weight:900;
  font-size:20px;
  letter-spacing:.1em;
  color:var(--paper);
}
.cta{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:0 20px;
  border-radius:999px;
  background:var(--acc);
  color:var(--paper);
  text-decoration:none;
  font-size:16px;
  font-weight:700;
  letter-spacing:.06em;
  transition:background .2s ease,transform .2s ease;
}
.cta:hover{background:#d95f27;transform:translateY(-1px)}
.nav{padding:0 12px 8px}
.nav p{
  display:flex;
  flex-wrap:wrap;
  gap:2px 2px;
}
.nav a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:0 12px;
  border-radius:10px;
  text-decoration:none;
  font-size:16px;
  font-weight:500;
  color:rgba(242,234,217,.78);
  transition:color .18s ease,background .18s ease;
}
.nav a:hover,.nav a:focus-visible{color:var(--paper);background:rgba(242,234,217,.14)}

/* ===== hero ===== */
.hero{
  position:relative;
  isolation:isolate;
  display:flex;
  align-items:flex-start;
  justify-content:flex-end;
  min-height:45vh;
  padding:30px 20px 40px;
  overflow:hidden;
  background:var(--ink);
  color:var(--paper);
}
.hero-media{
  position:absolute;
  inset:-12% 0;
  z-index:-2;
  will-change:transform;
}
.hero-imgwrap{
  position:absolute;
  inset:0;
  background:linear-gradient(135deg,#2b2823 10%,#7a411d 70%,#C0501E 130%);
}
.hero-imgwrap img{
  width:100%;
  height:100%;
  object-fit:cover;
  opacity:.55;
  filter:grayscale(.25) contrast(1.05);
}
.hero::after{
  content:"";
  position:absolute;
  inset:0;
  z-index:-1;
  background:linear-gradient(84deg,rgba(27,26,23,.94) 6%,rgba(27,26,23,.62) 58%,rgba(27,26,23,.34) 100%);
}
.ghost{
  position:absolute;
  left:-.05em;
  bottom:-.12em;
  z-index:0;
  pointer-events:none;
  font-size:clamp(76px,19vw,190px);
  font-weight:900;
  line-height:.8;
  letter-spacing:-.04em;
  color:rgba(242,234,217,.3);
  will-change:transform;
}
.ghost span{
  --i:0;
  position:absolute;
  left:0;
  bottom:0;
  white-space:nowrap;
  opacity:0;
  animation:cycle 21s linear infinite;
  animation-delay:calc(var(--i) * 3s);
}
@keyframes cycle{
  0%{opacity:0;transform:translateY(12px)}
  3%{opacity:1;transform:translateY(0)}
  12%{opacity:1}
  14.2%{opacity:0}
  100%{opacity:0}
}
.hero-inner{
  position:relative;
  z-index:2;
  margin-left:auto;
  max-width:30ch;
  text-align:right;
}
.hero h1{
  margin:0 0 14px;
  font-size:clamp(30px,7.4vw,58px);
  font-weight:900;
  line-height:1.06;
  letter-spacing:-.015em;
  text-shadow:0 2px 24px rgba(0,0,0,.35);
}
.lede{
  margin:0 0 0 auto;
  max-width:34ch;
  font-size:17px;
  font-weight:500;
  line-height:1.6;
  color:rgba(242,234,217,.88);
}
.lede > span{display:inline}

/* ===== body ===== */
.wrap{
  max-width:1180px;
  margin:0 auto;
  padding:44px 20px 60px;
}
.chapter{
  display:grid;
  grid-template-columns:minmax(0,1fr) 236px;
  gap:56px;
  align-items:start;
}
.prose{
  max-width:72ch;
  font-size:17px;
  counter-reset:sec;
}
.prose > div{
  position:relative;
  counter-increment:sec;
  padding:36px 0 12px;
  border-top:1px solid var(--line);
  scroll-margin-top:160px;
}
.prose > div:first-child{border-top:0;padding-top:0}
.prose > div::before{
  content:counter(sec,decimal-leading-zero);
  display:block;
  margin-bottom:4px;
  font-size:clamp(42px,8vw,74px);
  font-weight:900;
  line-height:.85;
  letter-spacing:-.05em;
  color:rgba(192,80,30,.3);
}
.prose h2{
  margin:0 0 .5em;
  font-size:clamp(22px,4.2vw,34px);
  font-weight:900;
  line-height:1.22;
  letter-spacing:-.01em;
}
.prose h3{
  margin:1.4em 0 .45em;
  font-size:21px;
  font-weight:700;
  line-height:1.35;
}
.prose h2 > span,.prose h3 > span{display:inline}
.prose p{margin:0 0 1.05em}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.3em}
.prose li{margin:.4em 0}
.prose a{color:var(--acc);text-underline-offset:3px}
.prose strong{font-weight:700}
.prose blockquote{
  margin:1.4em 0;
  padding:16px 20px;
  border-radius:18px;
  background:rgba(192,80,30,.1);
  border-left:4px solid var(--acc);
}
.prose blockquote p:last-child{margin:0}
.prose img{margin:1.3em 0;border-radius:18px}
.prose figure{margin:1.3em 0}
.prose figcaption{font-size:16px;color:var(--mute);margin-top:.5em}
.prose table{
  display:block;
  width:100%;
  overflow-x:auto;
  border-collapse:collapse;
  font-size:16px;
  margin:1.2em 0;
}
.prose th,.prose td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left}
.prose code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:16px;
  background:rgba(27,26,23,.07);
  padding:1px 6px;
  border-radius:6px;
}

/* reveal */
.rv{opacity:0;transform:translateY(20px);transition:opacity .7s ease,transform .7s ease}
.rv.in{opacity:1;transform:none}

/* ===== rail ===== */
.rail{
  position:sticky;
  top:158px;
  padding-left:18px;
  border-left:3px solid var(--acc);
}
.rail-h{
  margin:0 0 10px;
  font-size:16px;
  font-weight:700;
  letter-spacing:.22em;
  color:var(--acc);
}
.rail-list{
  counter-reset:r;
  list-style:none;
  margin:0 0 14px;
  padding:0;
}
.rail-list li + li{border-top:1px solid var(--line)}
.rail-list a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:42px;
  font-size:16px;
  text-decoration:none;
  color:var(--mute);
  transition:color .18s ease,padding-left .18s ease;
}
.rail-list a::before{
  counter-increment:r;
  content:counter(r,decimal-leading-zero);
  font-size:16px;
  font-weight:700;
  color:rgba(192,80,30,.65);
}
.rail-list a:hover,.rail-list a:focus-visible{color:var(--acc);padding-left:4px}
.rail-top{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  font-size:16px;
  color:var(--mute);
  text-decoration:none;
  border-bottom:1px solid var(--line);
}
.rail-top:hover{color:var(--acc)}

/* ===== footer ===== */
.foot{
  margin-top:24px;
  padding:46px 20px 26px;
  background:var(--ink);
  color:var(--paper);
  border-top:3px solid var(--acc);
}
.foot-cols{
  max-width:1180px;
  margin:0 auto;
  display:grid;
  grid-template-columns:1.1fr 1.5fr 1fr;
  gap:36px;
}
.foot dl{margin:0}
.foot dt{
  margin-bottom:12px;
  font-size:16px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--acc);
}
.foot dd{
  margin:0 0 4px;
  font-size:16px;
  color:rgba(242,234,217,.78);
}
.foot ul{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:0 14px;
  margin:0;
  padding:0;
  list-style:none;
}
.foot ul a,.foot dd a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  font-size:16px;
  text-decoration:none;
  color:rgba(242,234,217,.78);
}
.foot a:hover,.foot a:focus-visible{color:var(--paper)}
.foot-bar{
  max-width:1180px;
  margin:30px auto 0;
  padding-top:16px;
  border-top:1px solid rgba(242,234,217,.2);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  font-size:16px;
}
.foot-bar p{display:flex;flex-wrap:wrap;gap:6px;margin:0}
.foot-bar a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding-right:14px;
  text-decoration:none;
  color:rgba(242,234,217,.78);
}

@media (max-width:900px){
  .head{position:static}
  .chapter{grid-template-columns:minmax(0,1fr);gap:0}
  .rail{
    order:-1;
    position:static;
    padding:0 0 16px;
    border-left:0;
    border-bottom:2px solid var(--acc);
    margin-bottom:26px;
  }
  .rail-list{
    display:grid;
    grid-auto-flow:column;
    grid-auto-columns:max-content;
    gap:0 18px;
    overflow-x:auto;
    padding-bottom:4px;
  }
  .rail-list li + li{border-top:0}
  .rail-top{display:none}
  .prose > div{scroll-margin-top:20px}
  .wrap{padding:30px 18px 46px}
  .foot-cols{grid-template-columns:1fr 1fr;gap:26px}
  .foot-cols dl:first-child{grid-column:1/-1}
  .prose > div::before{font-size:46px}
}
@media (max-width:560px){
  .head-top{padding:6px 16px 0}
  .nav{padding:0 10px 6px}
  .nav a{padding:0 9px;font-size:16px}
  .brand{font-size:18px;letter-spacing:.06em}
  .cta{padding:0 16px}
  .hero{padding:24px 16px 34px;min-height:46vh}
  .hero-inner{max-width:100%}
  .foot ul{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .ghost span{animation:none;opacity:0}
  .ghost span:first-child{opacity:1}
  .rv{opacity:1;transform:none;transition:none}
  .cta,.nav a,.rail-list a{transition:none}
}

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