:root{
  --paper:#fafaf8;
  --ink:#1a1a1a;
  --gray:#4a4a4a;
  --line:#d6d2c9;
  --soft:#efede6;
  --serif:"Playfair Display SC","Songti SC","Times New Roman",serif;
  --sans:"Karla",system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
}

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

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

body{
  margin:0;
  padding-bottom:0;
  background-color:var(--paper);
  background-image:
    repeating-linear-gradient(0deg,rgba(26,26,26,.035) 0 1px,transparent 1px 5px),
    radial-gradient(circle at 16% 10%,rgba(74,74,74,.07),transparent 40%),
    radial-gradient(circle at 84% 74%,rgba(74,74,74,.06),transparent 46%),
    radial-gradient(circle at 40% 96%,rgba(26,26,26,.05),transparent 50%);
  background-attachment:fixed;
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.8;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

img{display:block;max-width:100%;height:auto}
a{color:inherit}
p{margin:0 0 1.1em}

/* 角标图标 */
.mark{
  position:fixed;
  top:12px;
  left:12px;
  z-index:90;
  display:flex;
  align-items:center;
  justify-content:center;
  width:48px;
  height:48px;
  background:var(--paper);
  border:2px solid var(--ink);
  border-radius:255px 12px 225px 14px/14px 225px 12px 255px;
  transform:rotate(-3deg);
  text-decoration:none;
  overflow:hidden;
}
.mark img{width:100%;height:100%;object-fit:cover;filter:grayscale(1) contrast(1.1)}
.mark-t{
  font-family:var(--serif);
  font-size:22px;
  line-height:1;
  color:var(--ink);
}

/* 主体框架 */
main{
  max-width:1180px;
  margin:0 auto;
  padding:0 20px;
}

article{display:block}

/* 首屏 */
.hero{
  position:relative;
  isolation:isolate;
  grid-column:1/-1;
  width:100vw;
  margin-left:calc(50% - 50vw);
  height:100vh;
  min-height:520px;
  display:grid;
  place-items:center;
  overflow:hidden;
  background:var(--ink);
  scroll-margin-top:32px;
}
.hero-img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  filter:grayscale(1) contrast(1.14) brightness(.95);
  z-index:-3;
}
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(26,26,26,.74),rgba(26,26,26,.34) 44%,rgba(26,26,26,.88));
  z-index:-2;
}
.hero::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:repeating-linear-gradient(0deg,rgba(250,250,248,.07) 0 1px,transparent 1px 4px);
  pointer-events:none;
  z-index:-2;
}
.hero-bare{
  background-color:var(--ink);
  background-image:
    repeating-linear-gradient(90deg,rgba(250,250,248,.05) 0 1px,transparent 1px 9px),
    radial-gradient(circle at 30% 30%,rgba(250,250,248,.08),transparent 55%);
}
.hero-word{
  position:absolute;
  z-index:-1;
  font-family:var(--serif);
  font-size:clamp(3rem,17vw,10.5rem);
  line-height:1;
  letter-spacing:.06em;
  color:rgba(250,250,248,.14);
  transform:rotate(-2.6deg);
  white-space:nowrap;
  user-select:none;
}
.hero-in{
  position:relative;
  z-index:2;
  max-width:22em;
  padding:0 22px;
  text-align:center;
}
.hero h1{
  margin:0;
  font-family:var(--serif);
  font-weight:700;
  font-size:clamp(1.95rem,7.2vw,4.3rem);
  line-height:1.18;
  letter-spacing:.02em;
  color:var(--paper);
  text-shadow:0 2px 0 rgba(0,0,0,.4);
}

/* 正文 */
.prose{
  padding:56px 0 0;
  font-size:17px;
  line-height:1.85;
  color:#222;
  max-width:44em;
}
.prose div{scroll-margin-top:28px}
.prose div + div{
  margin-top:52px;
  padding-top:44px;
  border-top:1px dashed var(--line);
}
.prose h2{
  display:inline-block;
  position:relative;
  margin:0 0 .9em;
  font-family:var(--serif);
  font-size:clamp(1.4rem,3.4vw,1.85rem);
  line-height:1.4;
  letter-spacing:.01em;
}
.prose h2::after{
  content:"";
  position:absolute;
  left:-3px;
  right:-8px;
  bottom:-7px;
  height:9px;
  border-bottom:2px solid var(--ink);
  border-radius:50%;
  transform:rotate(-.7deg);
  opacity:.85;
}
.prose h3{
  margin:1.8em 0 .7em;
  font-family:var(--sans);
  font-size:1.1rem;
  font-weight:700;
  letter-spacing:.02em;
}
.prose a{
  text-decoration:underline;
  text-decoration-thickness:1px;
  text-underline-offset:3px;
}
.prose a:hover{background:var(--soft)}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.3em}
.prose li{margin:.35em 0}
.prose blockquote{
  margin:1.6em 0;
  padding:14px 18px;
  border-left:3px solid var(--ink);
  background:rgba(255,255,255,.55);
  transform:rotate(-.25deg);
  font-style:normal;
}
.prose blockquote p:last-child{margin-bottom:0}
.prose hr{
  border:0;
  border-top:1px dashed var(--line);
  margin:2em 0;
}
.prose table{
  display:block;
  width:100%;
  overflow-x:auto;
  border-collapse:collapse;
  margin:0 0 1.4em;
  font-size:16px;
}
.prose th,.prose td{
  border:1px solid var(--line);
  padding:8px 10px;
  text-align:left;
}
.prose th{background:var(--soft)}
.prose code{
  font-size:.94em;
  background:var(--soft);
  padding:1px 4px;
}
.prose img{filter:grayscale(.9) contrast(1.05);margin:1.2em 0}

/* 侧栏 */
.side{
  margin:44px 0 0;
  padding:18px 16px 20px;
  background:rgba(255,255,255,.6);
  border:2px solid var(--ink);
  border-radius:255px 14px 225px 16px/16px 225px 14px 255px;
  transform:rotate(-.7deg);
}
.side small{
  display:block;
  font-size:14px;
  letter-spacing:.3em;
  color:var(--gray);
  margin-bottom:2px;
}
.side-h{
  margin:0 0 14px;
  font-family:var(--serif);
  font-size:1.15rem;
  line-height:1.4;
  letter-spacing:.04em;
}
.side-list{
  list-style:none;
  margin:0;
  padding:0;
  counter-reset:nv;
}
.side-list li{
  counter-increment:nv;
  border-bottom:1px dotted var(--line);
}
.side-list li:last-child{border-bottom:0}
.side-list a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:6px 2px;
  font-size:16px;
  line-height:1.45;
  text-decoration:none;
}
.side-list a::before{
  content:counter(nv,decimal-leading-zero);
  font-family:var(--serif);
  font-size:14px;
  color:var(--gray);
  flex:0 0 auto;
}
.side-list a:hover{background:var(--soft)}

/* 页脚 */
.foot{
  margin-top:56px;
  padding:0 20px 92px;
  background:var(--ink);
  color:var(--paper);
  border-top:2px solid var(--ink);
}
.foot div{
  max-width:1180px;
  margin:0 auto;
  text-align:center;
}
.foot-a{padding:44px 0 8px}
.foot-a small{
  display:block;
  margin-bottom:8px;
  font-size:14px;
  letter-spacing:.35em;
  color:#a9a59d;
}
.foot h2{
  margin:0;
  font-family:var(--serif);
  font-weight:400;
  font-size:clamp(2.3rem,11vw,5.6rem);
  line-height:1.06;
  letter-spacing:.05em;
}
.foot-b{
  margin-top:22px;
  padding:16px 0 0;
  border-top:1px dashed var(--gray);
  font-size:16px;
  color:#c8c4bc;
}
.cr{margin:0 0 10px;letter-spacing:.06em}
.cr-top{margin:0}
.top{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 20px;
  color:var(--paper);
  text-decoration:none;
  border:1px solid #6a6862;
  border-radius:200px 10px 190px 12px/12px 190px 10px 200px;
  transform:rotate(.6deg);
  font-size:16px;
}
.top:hover{background:#2b2b2b}

/* 底部固定条 */
.dock{
  position:fixed;
  left:0;
  right:0;
  bottom:0;
  z-index:80;
  background:var(--ink);
  color:var(--paper);
  border-top:2px solid var(--ink);
}
.dock details{position:relative}
.dock summary{
  list-style:none;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  min-height:56px;
  padding:0 20px;
  cursor:pointer;
  font-size:16px;
  letter-spacing:.34em;
  text-indent:.34em;
}
.dock summary::-webkit-details-marker{display:none}
.dock summary::after{
  content:"";
  width:24px;
  height:13px;
  border-top:2px solid var(--paper);
  border-bottom:2px solid var(--paper);
  transform:rotate(-2.4deg);
  flex:0 0 auto;
}
.dock details[open] summary{background:#262626}
.dock details[open] summary::after{
  height:11px;
  border-top:2px solid var(--paper);
  border-bottom:2px solid var(--paper);
  transform:rotate(2deg) scaleX(.86);
}
.dock menu{
  margin:0;
  padding:8px 10px 12px;
  list-style:none;
  position:absolute;
  left:0;
  right:0;
  bottom:100%;
  max-height:66vh;
  overflow-y:auto;
  background:var(--paper);
  color:var(--ink);
  border-top:2px solid var(--ink);
  box-shadow:0 -6px 0 rgba(26,26,26,.12);
  counter-reset:nv2;
}
.dock menu li{
  counter-increment:nv2;
  border-bottom:1px dashed var(--line);
}
.dock menu li:last-child{border-bottom:0}
.dock menu a{
  display:flex;
  align-items:center;
  gap:12px;
  min-height:46px;
  padding:6px 10px;
  font-size:16px;
  line-height:1.4;
  text-decoration:none;
}
.dock menu a::before{
  content:counter(nv2,decimal-leading-zero);
  font-family:var(--serif);
  font-size:14px;
  color:var(--gray);
  flex:0 0 auto;
}
.dock menu a:hover{background:var(--soft)}

/* 显现 */
html.js .rv{opacity:0}
html.js .rv.in{
  animation:sk 0.5s steps(6,end) both;
}
@keyframes sk{
  0%{opacity:0;transform:translateY(15px) rotate(-.5deg)}
  100%{opacity:1;transform:none}
}

/* 桌面 */
@media (min-width:960px){
  body{font-size:17px}
  article{
    display:grid;
    grid-template-columns:minmax(0,1fr) 238px;
    column-gap:46px;
    align-items:start;
  }
  .prose{grid-column:1;padding-top:64px}
  .side{
    grid-column:2;
    position:sticky;
    top:26px;
    margin:64px 0 0;
  }
  .dock details{max-width:1180px;margin:0 auto}
  .dock menu{left:auto;right:auto;width:min(420px,100%);border-left:2px solid var(--ink);border-right:2px solid var(--ink)}
  .foot{padding-bottom:104px}
}

@media (min-width:1200px){
  .hero h1{letter-spacing:.03em}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  html.js .rv{opacity:1}
  html.js .rv.in{animation:none}
  .mark,.side,.top,.prose blockquote{transform:none}
}

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