@import url('https://fonts.googleapis.com/css2?family=Amatic+SC:wght@400;700&family=Cabin:wght@400;500;600;700&display=swap');

:root{
  --paper:#f5e6c8;
  --paper-2:#efdcb8;
  --paper-3:#e7cf9f;
  --ochre:#d4a574;
  --ochre-deep:#9d6c33;
  --ink:#262117;
  --ink-2:#4a3f30;
  --line:rgba(38,33,23,.26);
  --rail:250px;
  --hand:"Amatic SC","Songti SC","Noto Serif SC",Georgia,"Times New Roman",serif;
  --sans:"Cabin","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(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:17px;
  line-height:1.8;
  min-height:100%;
}

/* 颗粒 */
.grain{
  position:fixed;
  inset:0;
  z-index:70;
  pointer-events:none;
  opacity:.30;
  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='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
}

/* 漏光 */
.leak{
  position:fixed;
  inset:0;
  z-index:69;
  pointer-events:none;
  background:
    radial-gradient(58vw 42vh at 93% 5%, rgba(226,164,92,.52), rgba(226,164,92,0) 68%),
    radial-gradient(46vw 46vh at 3% 90%, rgba(190,104,54,.26), rgba(190,104,54,0) 72%);
  animation:leak 22s ease-in-out infinite alternate;
}
@keyframes leak{from{opacity:.42}to{opacity:.78}}

/* 左侧竖排导航 */
.rail{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--rail);
  z-index:40;
  display:flex;
  flex-direction:column;
  gap:20px;
  padding:26px 20px 24px;
  background:linear-gradient(180deg,var(--paper-2),var(--paper));
  border-right:2px solid var(--ink);
  overflow-y:auto;
}

.mark{
  display:block;
  text-decoration:none;
  color:var(--ink);
  font-family:var(--hand);
  font-weight:700;
  font-size:27px;
  line-height:1.05;
  letter-spacing:.05em;
  word-break:break-word;
  padding-bottom:14px;
  border-bottom:2px solid var(--ink);
}
.mark:hover{color:var(--ochre-deep)}

.rail-nav ol{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-direction:column;
  gap:8px;
  counter-reset:nav;
}
.rail-nav li{list-style:none;flex:0 0 auto}

.rail-nav a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:9px 15px;
  border:1.5px solid var(--line);
  border-radius:999px;
  background:rgba(255,255,255,.26);
  color:var(--ink);
  text-decoration:none;
  font-size:16px;
  line-height:1.3;
  transition:background .24s,border-color .24s,transform .18s;
}
.rail-nav a::before{
  counter-increment:nav;
  content:counter(nav,decimal-leading-zero);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--ochre-deep);
  flex:0 0 auto;
}
.rail-nav a:hover,
.rail-nav a:focus-visible{
  background:var(--ochre);
  border-color:var(--ink);
  transform:translateX(3px);
}
.rail-nav a.hit{background:var(--ochre);border-color:var(--ink)}
.rail-nav a.dim{opacity:.34}

/* 搜索 */
.seek{
  margin-top:auto;
  padding-top:18px;
  border-top:2px solid var(--line);
  display:flex;
  flex-direction:column;
  gap:8px;
}
.seek-label{font-size:13px;letter-spacing:.26em;color:var(--ochre-deep)}
.seek input{
  width:100%;
  min-height:44px;
  padding:10px 12px;
  font:400 16px/1.4 var(--sans);
  color:var(--ink);
  background:rgba(255,255,255,.52);
  border:1.5px solid var(--ink);
  border-radius:0;
}
.seek input::placeholder{color:rgba(38,33,23,.45)}
.seek button{
  min-height:44px;
  padding:10px 14px;
  border:1.5px solid var(--ink);
  border-radius:0;
  background:var(--ink);
  color:var(--paper);
  font:600 15px/1 var(--sans);
  letter-spacing:.18em;
  cursor:pointer;
  transition:background .2s,color .2s;
}
.seek button:hover{background:var(--ochre);color:var(--ink)}

/* 首屏 */
.hero{
  margin-left:var(--rail);
  min-height:100vh;
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,.85fr);
  align-items:center;
  gap:52px;
  padding:70px 56px;
  border-bottom:2px solid var(--ink);
}
.hero--solo{grid-template-columns:minmax(0,1fr)}
.hero-copy{max-width:46ch}

.hero-tag{
  margin:0 0 16px;
  font-size:15px;
  letter-spacing:.36em;
  color:var(--ochre-deep);
}

h1{
  margin:0;
  font-family:var(--hand);
  font-weight:700;
  font-size:clamp(42px,7vw,92px);
  line-height:1.02;
  letter-spacing:.01em;
}

.hero-frame{
  margin:0;
  justify-self:end;
  width:min(100%,420px);
  transform:rotate(-1.8deg);
}
.hero-plate{
  background:#fff8e7;
  border:1px solid rgba(38,33,23,.35);
  padding:13px 13px 52px;
  box-shadow:0 20px 44px rgba(38,33,23,.26);
}
.hero-plate:hover{animation:vhs .55s steps(3) 1}
@keyframes vhs{
  0%{transform:skewX(0)}
  30%{transform:skewX(-1.4deg)}
  65%{transform:skewX(.9deg)}
  100%{transform:skewX(0)}
}
.hero-photo{
  display:block;
  width:100%;
  height:auto;
  max-height:58vh;
  object-fit:cover;
  filter:sepia(.32) contrast(1.07) saturate(.82);
}

/* 正文区 */
.stage{
  margin-left:var(--rail);
  padding:56px;
}
.stage-head{
  display:flex;
  align-items:baseline;
  gap:16px;
  border-bottom:2px solid var(--ink);
  padding-bottom:12px;
  margin-bottom:34px;
}
.stage-head small{
  font-size:14px;
  letter-spacing:.34em;
  color:var(--ochre-deep);
}
.stage-head h2{
  margin:0;
  font-family:var(--hand);
  font-weight:700;
  font-size:34px;
  line-height:1;
}

.paper{max-width:76ch}
.paper section{
  scroll-margin-top:26px;
  padding:36px 0 42px;
  border-top:1px dashed var(--line);
}
.paper section:first-of-type{border-top:0;padding-top:0}

.paper h2{
  font-family:var(--hand);
  font-weight:700;
  font-size:clamp(28px,3.4vw,40px);
  line-height:1.15;
  margin:0 0 .6em;
  padding-bottom:.25em;
  border-bottom:1px solid var(--line);
}
.paper h3{
  font-family:var(--hand);
  font-weight:700;
  font-size:26px;
  line-height:1.22;
  margin:1.4em 0 .5em;
}
.paper p{margin:0 0 1.05em}
.paper strong{background:linear-gradient(transparent 62%, rgba(212,165,116,.72) 62%)}
.paper a{
  color:var(--ochre-deep);
  text-decoration:underline;
  text-decoration-style:dotted;
  text-underline-offset:3px;
}
.paper a:hover{color:var(--ink);text-decoration-style:solid}

.paper ul,.paper ol{padding-left:1.3em;margin:0 0 1.05em}
.paper li{margin:.4em 0}
.paper ul{list-style:none}
.paper ul>li{position:relative;padding-left:1.1em}
.paper ul>li::before{
  content:"";
  position:absolute;
  left:0;
  top:.72em;
  width:9px;
  height:9px;
  background:var(--ochre);
  border:1px solid var(--ink);
}
.paper ol{list-style:decimal}

.paper img{
  max-width:100%;
  height:auto;
  display:block;
  margin:1.4em 0;
  border:1px solid var(--line);
  filter:sepia(.22) contrast(1.04);
}
.paper figure{margin:1.4em 0}
.paper blockquote{
  margin:1.5em 0;
  padding:6px 0 6px 20px;
  border-left:4px solid var(--ochre);
  color:var(--ink-2);
}
.paper hr{border:0;border-top:1px dashed var(--line);margin:2em 0}
.paper table{width:100%;border-collapse:collapse;margin:1.4em 0;font-size:16px}
.paper th,.paper td{border:1px solid var(--line);padding:9px 12px;text-align:left}
.paper th{background:var(--paper-2)}

/* 页脚 */
.foot{
  margin-left:var(--rail);
  background:var(--ink);
  color:var(--paper);
  border-top:2px solid var(--ink);
  padding:52px 56px 26px;
}
.foot-brand{
  margin:0;
  font-family:var(--hand);
  font-weight:700;
  font-size:clamp(46px,9vw,116px);
  line-height:.92;
  letter-spacing:.04em;
  color:var(--ochre);
  word-break:break-word;
}
.foot-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:32px;
  margin:34px 0 0;
  padding-top:26px;
  border-top:1px solid rgba(245,230,200,.28);
}
.foot-cols dt{
  font-size:13px;
  letter-spacing:.3em;
  color:var(--ochre);
  margin:0 0 8px;
}
.foot-cols dd{margin:0}
.foot-cols a{
  display:inline-block;
  min-height:40px;
  padding:8px 0;
  color:var(--paper);
  text-decoration:none;
  border-bottom:1px solid transparent;
  font-size:16px;
}
.foot-cols a:hover{color:var(--ochre);border-bottom-color:var(--ochre)}
.foot-copy{
  margin:26px 0 0;
  padding-top:16px;
  border-top:1px solid rgba(245,230,200,.28);
  font-size:14px;
  letter-spacing:.14em;
  color:rgba(245,230,200,.72);
}

/* 滚动显现 */
.js .reveal{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .75s ease,transform .75s ease;
}
.js .reveal.in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001s !important;
    animation-iteration-count:1 !important;
    transition-duration:.001s !important;
  }
  .js .reveal{opacity:1;transform:none}
}

@media (max-width:1100px){
  .hero{padding:48px 34px;gap:36px}
  .stage{padding:44px 34px}
  .foot{padding:44px 34px 24px}
}

@media (max-width:900px){
  .rail{
    position:static;
    width:auto;
    border-right:0;
    border-bottom:2px solid var(--ink);
    padding:14px 16px 12px;
    gap:10px;
    overflow:visible;
  }
  .mark{font-size:23px;padding-bottom:10px}
  .rail-nav ol{
    flex-direction:row;
    gap:8px;
    overflow-x:auto;
    padding-bottom:4px;
    -webkit-overflow-scrolling:touch;
  }
  .rail-nav a{white-space:nowrap;padding:8px 14px;min-height:42px}
  .rail-nav a:hover{transform:none}
  .seek{
    margin-top:2px;
    padding-top:10px;
    border-top-width:1px;
    display:grid;
    grid-template-columns:minmax(0,1fr) auto;
    gap:8px;
  }
  .seek-label{grid-column:1 / -1;font-size:12px}
  .hero{
    margin-left:0;
    min-height:0;
    grid-template-columns:minmax(0,1fr);
    gap:26px;
    padding:32px 18px 38px;
  }
  .hero-frame{
    justify-self:start;
    width:100%;
    max-width:340px;
    transform:rotate(-1.2deg);
  }
  .hero-photo{max-height:none}
  .stage{margin-left:0;padding:26px 18px 38px}
  .stage-head{margin-bottom:24px}
  .stage-head h2{font-size:28px}
  .paper h2{font-size:28px}
  .paper div{scroll-margin-top:16px}
  .foot{margin-left:0;padding:34px 18px 22px}
  .foot-cols{grid-template-columns:minmax(0,1fr);gap:18px}
}

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