@import url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;500;600;700&family=Poppins:wght@400;500;600;700&display=swap');

:root{
  --ink:#000;
  --paper:#fff;
  --line:rgba(0,0,0,.16);
  --faint:rgba(0,0,0,.55);
  --shadow:0 26px 44px -34px rgba(0,0,0,.85);
  --rail:13.5rem;
  --mast:14.5rem;
}

*{box-sizing:border-box}

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

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"Open Sans",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  font-size:1rem;
  line-height:1.75;
  font-weight:400;
}

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

a{color:var(--ink)}

h1,h2,h3,h4{font-family:"Poppins","Open Sans",system-ui,sans-serif}

/* ---------- 左侧竖排报头 ---------- */
.masthead{
  position:fixed;
  inset:0 auto 0 0;
  width:var(--mast);
  display:flex;
  flex-direction:column;
  gap:1.1rem;
  padding:1.25rem 1rem 1.5rem;
  background:var(--paper);
  border-right:2px solid var(--ink);
  z-index:30;
  overflow-y:auto;
}

.mast-top{
  display:flex;
  flex-direction:column;
  gap:.85rem;
  border-bottom:1px solid var(--line);
  padding-bottom:1rem;
}

.mark{
  width:44px;
  height:44px;
  display:grid;
  place-items:center;
  border:2px solid var(--ink);
  text-decoration:none;
  background:var(--paper);
  overflow:hidden;
}

.mark img{width:100%;height:100%;object-fit:cover;filter:grayscale(1)}

.mark-glyph{
  width:18px;
  height:18px;
  background:var(--ink);
  box-shadow:8px 8px 0 0 var(--ink);
  transform:translate(-4px,-4px);
}

.strip{
  margin:0;
  font-size:.875rem;
  line-height:1.55;
  color:var(--faint);
  max-height:9.5rem;
  overflow:hidden;
}

.jump p{
  margin:0;
  display:flex;
  flex-direction:column;
  gap:0;
}

.jump a{
  display:flex;
  align-items:center;
  gap:.5rem;
  min-height:44px;
  padding:.35rem 0;
  font-size:1rem;
  font-weight:500;
  text-decoration:none;
  border-bottom:1px solid var(--line);
  letter-spacing:.01em;
}

.jump a::before{
  content:"";
  width:6px;
  height:6px;
  background:var(--ink);
  flex:0 0 auto;
  transform:rotate(45deg);
}

.jump a:hover,.jump a.is-active{background:var(--ink);color:var(--paper);padding-left:.55rem}
.jump a:hover::before,.jump a.is-active::before{background:var(--paper)}

/* ---------- 主区 ---------- */
main{margin-left:var(--mast)}

.hero{
  position:relative;
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:1.5rem;
  align-items:end;
  min-height:45vh;
  padding:2.75rem 2rem 2rem;
  border-bottom:3px solid var(--ink);
}

.plates{
  position:relative;
  min-height:34vh;
  align-self:stretch;
}

.plate{
  margin:0;
  position:absolute;
  overflow:hidden;
  background:var(--paper);
  border:1px solid var(--ink);
}

.plate-a{width:60%;height:72%;left:0;top:0}
.plate-b{width:54%;height:62%;right:0;bottom:0;border-width:2px;box-shadow:var(--shadow)}

.plate-img,.plate img{width:100%;height:100%;object-fit:cover;filter:grayscale(1) contrast(1.05)}

.plate-hatch{
  display:block;
  width:100%;
  height:100%;
  background:repeating-linear-gradient(135deg,var(--ink) 0 1px,var(--paper) 1px 9px);
}

.hero-copy{
  text-align:right;
  position:relative;
  padding-bottom:.5rem;
}

.badge{
  position:absolute;
  top:-1.35rem;
  right:0;
  display:inline-block;
  padding:.3rem .7rem;
  border:1px solid var(--ink);
  background:var(--paper);
  font-family:"Poppins",sans-serif;
  font-size:.8rem;
  letter-spacing:.22em;
  box-shadow:0 14px 22px -18px rgba(0,0,0,.9);
}

h1{
  margin:0 0 .75rem;
  font-size:clamp(1.85rem,4.6vw,3.3rem);
  font-weight:700;
  line-height:1.03;
  letter-spacing:-.025em;
  word-break:break-word;
}

.standfirst{
  margin:0 0 0 auto;
  max-width:38ch;
  padding-top:.75rem;
  border-top:1px solid var(--ink);
  font-size:1rem;
  line-height:1.7;
  color:var(--faint);
}

/* ---------- 侧栏 + 正文 ---------- */
.frame{
  display:grid;
  grid-template-columns:var(--rail) minmax(0,1fr);
  gap:2.5rem;
  padding:2.5rem 2rem 3rem;
  align-items:start;
}

.rail{
  position:sticky;
  top:1.5rem;
  border-top:3px solid var(--ink);
  padding-top:.6rem;
}

.rail-head{
  margin:0 0 .5rem;
  font-size:.95rem;
  font-weight:600;
  letter-spacing:.14em;
}

.rail-head span{display:inline-flex;align-items:center;gap:.4rem}

.spark{
  display:inline-block;
  width:7px;
  height:7px;
  background:var(--ink);
}

.rail-list{
  list-style:none;
  counter-reset:rail;
  margin:0;
  padding:0;
}

.rail-list li a{
  display:flex;
  gap:.55rem;
  align-items:baseline;
  padding:.45rem 0;
  min-height:40px;
  font-size:1rem;
  text-decoration:none;
  border-bottom:1px solid var(--line);
}

.rail-list li a::before{
  counter-increment:rail;
  content:counter(rail,decimal-leading-zero);
  font-family:"Poppins",sans-serif;
  font-size:.75rem;
  color:var(--faint);
  flex:0 0 auto;
}

.rail-list li a:hover,.rail-list li a.is-active{background:var(--ink);color:var(--paper);padding-left:.5rem}
.rail-list li a:hover::before,.rail-list li a.is-active::before{color:var(--paper)}

.content{min-width:0}

.content > section{
  scroll-margin-top:1.25rem;
  background:var(--paper);
  border:1px solid var(--line);
  border-top:3px solid var(--ink);
  padding:1.5rem 1.35rem 1.9rem;
  margin:0 0 2rem;
  box-shadow:var(--shadow);
}

.content h2,.content h3,.content h4{
  line-height:1.22;
  letter-spacing:-.012em;
  margin:1.6rem 0 .6rem;
}

.content h2{font-size:clamp(1.35rem,2.8vw,1.7rem);font-weight:600}
.content h3{font-size:1.15rem;font-weight:600}
.content h4{font-size:1.02rem;font-weight:600}

.content h2 span,.content h3 span{display:inline}

.content p{margin:0 0 1rem}

.content > section:first-of-type p:first-of-type::first-letter{
  float:left;
  font-family:"Poppins",sans-serif;
  font-weight:700;
  font-size:3.5rem;
  line-height:.8;
  padding:.12em .16em 0 0;
}

.content a{text-underline-offset:.18em;text-decoration-thickness:1px}

.content ul,.content ol{padding-left:1.35rem;margin:0 0 1rem}
.content li{margin:.25rem 0}

.content figure{margin:1.35rem 0}
.content figure img{border:1px solid var(--ink);filter:grayscale(1)}

.content figcaption{
  font-size:.875rem;
  color:var(--faint);
  padding-top:.4rem;
  border-top:1px solid var(--line);
  margin-top:.5rem;
}

.content blockquote{
  margin:1.5rem 0;
  padding:.9rem 1.1rem;
  border-left:6px solid var(--ink);
  font-size:1.1rem;
  line-height:1.6;
  font-style:italic;
}

.content blockquote p:last-child{margin-bottom:0}

.content table{width:100%;border-collapse:collapse;margin:1rem 0;font-size:.95rem}
.content th,.content td{border:1px solid var(--line);padding:.5rem .6rem;text-align:left}
.content th{background:rgba(0,0,0,.04)}

.content code{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:.92em;
  border:1px solid var(--line);
  padding:.05em .3em;
}

/* ---------- 页脚 ---------- */
.colophon{
  margin-left:var(--mast);
  border-top:3px solid var(--ink);
  padding:2.5rem 2rem 1.5rem;
}

.giant{
  margin:0 0 2rem;
  font-size:clamp(2.4rem,10.5vw,6.5rem);
  font-weight:700;
  line-height:.9;
  letter-spacing:-.045em;
  word-break:break-word;
}

.giant span{display:inline-flex;align-items:flex-end;gap:.12em}

.cols{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr;
  gap:2rem;
  border-top:1px solid var(--ink);
  padding-top:1.4rem;
}

.cols address{
  font-style:normal;
  display:flex;
  flex-direction:column;
  gap:.35rem;
  line-height:1.6;
}

.cols address strong{font-family:"Poppins",sans-serif;font-size:1.05rem;font-weight:600}
.addr-key{font-size:.9rem;color:var(--faint)}

.col-list{list-style:none;margin:0;padding:0}

.col-list li a{
  display:flex;
  align-items:center;
  min-height:40px;
  padding:.35rem 0;
  font-size:1rem;
  text-decoration:none;
  border-bottom:1px solid var(--line);
}

.col-list li a:hover{background:var(--ink);color:var(--paper);padding-left:.5rem}

.copy{
  margin:2rem 0 0;
  padding-top:.9rem;
  border-top:1px solid var(--line);
  font-size:.85rem;
  color:var(--faint);
}

/* ---------- 动效 ---------- */
.reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .62s ease,transform .62s cubic-bezier(.22,.7,.3,1);
  will-change:opacity,transform;
}

.reveal.is-in{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
}

/* ---------- 窄屏 ---------- */
@media (max-width:900px){
  .masthead{
    position:static;
    width:auto;
    flex-direction:row;
    flex-wrap:wrap;
    align-items:center;
    border-right:0;
    border-bottom:3px solid var(--ink);
    padding:.7rem 1rem .5rem;
    overflow:visible;
  }

  .mast-top{
    flex-direction:row;
    align-items:center;
    gap:.75rem;
    width:100%;
    border-bottom:0;
    padding-bottom:0;
  }

  .strip{flex:1 1 auto;min-width:0;max-height:3.2rem}

  .jump{width:100%}

  .jump p{
    flex-direction:row;
    flex-wrap:wrap;
    gap:0 1rem;
    padding-top:.35rem;
    border-top:1px solid var(--line);
    margin-top:.5rem;
  }

  .jump a{border-bottom:0;padding:.5rem 0;min-height:44px}

  main,.colophon{margin-left:0}

  .hero{
    grid-template-columns:1fr;
    min-height:0;
    gap:1.15rem;
    padding:1.5rem 1rem 1.25rem;
  }

  .plates{min-height:40vw}

  .hero-copy{text-align:left;padding-bottom:0}

  .badge{position:static;display:inline-block;margin-bottom:.7rem}

  .standfirst{margin-left:0;max-width:none}

  .frame{grid-template-columns:1fr;gap:1.5rem;padding:1.5rem 1rem 2rem}

  .rail{position:static}

  .rail-list{display:flex;flex-wrap:wrap;gap:0 1rem}

  .rail-list li{flex:1 1 12rem}

  .content > section{
    padding:1.25rem 1rem 1.5rem;
    scroll-margin-top:5.5rem;
  }

  .content blockquote{margin-left:0;margin-right:0}

  .colophon{padding:2rem 1rem 1.5rem}

  .cols{grid-template-columns:1fr;gap:1.4rem}
}

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