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

:root{
  --ink:#1f1f1f;
  --paper:#ffffff;
  --fog:#f5f5f5;
  --line:rgba(31,31,31,.18);
  --dot:rgba(31,31,31,.14);
  --r:4px;
}

*{box-sizing:border-box}

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

body{
  margin:0;
  font-family:"Space Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  font-size:16px;
  line-height:1.65;
  color:var(--ink);
  background-color:var(--fog);
  background-image:radial-gradient(var(--dot) 1px,transparent 1.2px);
  background-size:22px 22px;
}

img{display:block;max-width:100%;height:auto}
a{color:inherit}
h1,h2,h3{line-height:1.16;letter-spacing:-.02em;margin:0 0 .5em;font-weight:700}
p{margin:0 0 1em}
small{
  display:block;
  font-size:15px;
  line-height:1.5;
  letter-spacing:.08em;
  color:rgba(31,31,31,.55);
  margin:0 0 4px;
}

/* 顶栏 */
.bar{
  display:flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  background:var(--paper);
  border-bottom:1px dashed var(--line);
  position:relative;
  z-index:40;
}

.mark{
  flex:0 0 auto;
  display:grid;
  place-items:center;
  width:42px;
  height:42px;
  background:var(--ink);
  color:var(--paper);
  border-radius:var(--r);
  text-decoration:none;
  font-weight:700;
  font-size:19px;
  overflow:hidden;
}
.mark img{width:100%;height:100%;object-fit:cover;border-radius:var(--r)}

.mtog{position:absolute;opacity:0;width:1px;height:1px;pointer-events:none}

.mbtn{
  display:none;
  align-items:center;
  min-height:44px;
  padding:11px 13px;
  background:var(--fog);
  border:1px dashed var(--line);
  border-radius:var(--r);
  cursor:pointer;
  font:inherit;
  font-size:16px;
}

.nav{margin-left:4px}
.nav p{display:flex;flex-wrap:wrap;gap:2px;margin:0}
.nav a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:11px 9px;
  border-radius:var(--r);
  text-decoration:none;
  font-size:16px;
}
.nav a:hover{background:var(--fog)}

.cta{
  margin-left:auto;
  flex:0 0 auto;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:11px 15px;
  background:var(--ink);
  color:var(--paper);
  text-decoration:none;
  border-radius:var(--r);
  font-size:16px;
}
.cta:hover{background:#000}

/* 粘性锚点条 */
.subbar{
  position:sticky;
  top:0;
  z-index:35;
  display:flex;
  align-items:center;
  gap:4px;
  padding:4px 10px;
  overflow-x:auto;
  background:rgba(255,255,255,.94);
  border-bottom:1px dashed var(--line);
  backdrop-filter:blur(6px);
}
.subbar p{display:flex;gap:2px;margin:0;flex:0 0 auto}
.subbar a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:11px 10px;
  border-radius:var(--r);
  text-decoration:none;
  white-space:nowrap;
  font-size:16px;
  color:rgba(31,31,31,.7);
}
.subbar a:hover{background:var(--fog);color:var(--ink)}
.subbar a.on{background:var(--ink);color:var(--paper)}
.subbar .up{margin-left:auto;flex:0 0 auto;color:var(--ink)}

/* 主体 bento 网格 */
main{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:14px;
  padding:14px;
  max-width:1180px;
  margin:0 auto;
}

main > section{
  grid-column:span 2;
  background:var(--paper);
  border-radius:var(--r);
  padding:22px;
  box-shadow:0 4px 6px rgba(0,0,0,.05);
  scroll-margin-top:64px;
  min-width:0;
}
main > section > :last-child{margin-bottom:0}
main > section h2{font-size:clamp(20px,2.4vw,26px);margin-top:0}
main > section h3{font-size:18px;margin-top:0}
main > section a{text-decoration:underline;text-underline-offset:3px}
main > section img{border-radius:var(--r);margin:10px 0}

/* 头图块 */
.hero{
  grid-column:1/-1;
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:18px;
  align-items:center;
  min-height:45vh;
  padding:24px;
}
.hero h1{
  font-size:clamp(26px,4.6vw,46px);
  margin:.05em 0 .35em;
  word-break:break-word;
}
.lede{margin:0 0 16px;color:rgba(31,31,31,.72);max-width:46ch}
.hjump{margin:0}
.hjump a{
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:11px 16px;
  background:var(--ink);
  color:var(--paper);
  text-decoration:none;
  border-radius:var(--r);
}
.eyebrow{letter-spacing:.2em}

.art{
  position:relative;
  margin:0;
  height:100%;
  min-height:240px;
  border-radius:var(--r);
  overflow:hidden;
  background-color:var(--fog);
  background-image:radial-gradient(var(--dot) 1px,transparent 1.2px);
  background-size:14px 14px;
}
.art img{
  position:absolute;
  width:58%;
  height:70%;
  object-fit:cover;
  border-radius:var(--r);
  box-shadow:0 8px 20px rgba(0,0,0,.16);
  transition:transform .45s ease;
}
.art img.a{top:7%;left:2%;transform:rotate(-3deg)}
.art img.b{bottom:7%;right:2%;transform:rotate(3deg);z-index:1}
.art:hover img.a{transform:rotate(-1deg) scale(1.02)}
.art:hover img.b{transform:rotate(1deg) scale(1.02)}

/* 收尾块 */
.closing{
  grid-column:1/-1;
  display:grid;
  grid-template-columns:1.4fr .9fr;
  gap:14px;
  background:transparent;
  box-shadow:none;
  padding:0;
}
.closing-fig{
  margin:0;
  min-height:180px;
  border-radius:var(--r);
  background-color:var(--ink);
  background-image:radial-gradient(rgba(255,255,255,.22) 1px,transparent 1.2px);
  background-size:18px 18px;
}
.rail{
  background:var(--paper);
  border-radius:var(--r);
  padding:20px;
  box-shadow:0 4px 6px rgba(0,0,0,.05);
}
.rail h2{font-size:20px;margin:0 0 12px}
.rail-list{display:flex;flex-wrap:wrap;gap:6px;margin:0}
.rail-list a{
  display:inline-flex;
  align-items:center;
  min-height:42px;
  padding:10px 12px;
  border:1px dashed var(--line);
  border-radius:var(--r);
  text-decoration:none;
}
.rail-list a:hover{background:var(--fog)}

.sub-form{display:flex;flex-wrap:wrap;gap:6px;margin:16px 0 0}
.sub-form input{
  flex:1 1 130px;
  min-width:0;
  min-height:44px;
  padding:10px 12px;
  font:inherit;
  font-size:16px;
  color:var(--ink);
  background:var(--fog);
  border:1px dashed var(--line);
  border-radius:var(--r);
}
.sub-form button{
  min-height:44px;
  padding:10px 16px;
  font:inherit;
  font-size:16px;
  color:var(--paper);
  background:var(--ink);
  border:0;
  border-radius:var(--r);
  cursor:pointer;
}

/* 页脚 */
.foot{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:14px;
  margin-top:26px;
  padding:32px 18px 20px;
  background:var(--ink);
  color:var(--paper);
}
.foot p{margin:0}
.foot a{
  color:var(--paper);
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  min-height:40px;
  padding:8px 6px;
  border-bottom:1px dashed rgba(255,255,255,.35);
}
.foot small{color:rgba(255,255,255,.62)}
.f-brand{font-size:20px;font-weight:700;letter-spacing:.06em}
.f-links{display:flex;flex-wrap:wrap;gap:4px}
.f-key{color:rgba(255,255,255,.72)}
.f-copy{
  grid-column:1/-1;
  margin-top:8px;
  padding-top:14px;
  text-align:center;
  font-size:15px;
  color:rgba(255,255,255,.6);
  border-top:1px dashed rgba(255,255,255,.25);
}
.f-small{grid-column:1/-1;text-align:center}

/* 动效 */
.rv{opacity:0;transform:translateY(10px);transition:opacity .5s ease,transform .5s ease}
.rv.in{opacity:1;transform:none}

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

@media (max-width:960px){
  main{grid-template-columns:1fr}
  main > section{grid-column:1/-1}
  .hero{grid-template-columns:1fr;min-height:0}
  .art{min-height:220px}
  .closing{grid-template-columns:1fr}
  .closing-fig{min-height:110px}
  .foot{grid-template-columns:1fr}
  .f-copy{margin-top:0}
}

@media (max-width:760px){
  .mbtn{display:inline-flex}
  .nav{
    display:none;
    position:absolute;
    left:0;
    right:0;
    top:100%;
    padding:8px 10px 12px;
    background:var(--paper);
    border-bottom:1px dashed var(--line);
    box-shadow:0 10px 18px rgba(0,0,0,.12);
    max-height:76vh;
    overflow:auto;
  }
  .nav p{flex-direction:column}
  .nav a{padding:13px 12px}
  .mtog:checked ~ .nav{display:block}
  .cta{margin-left:auto}
}

@media (max-width:560px){
  main{padding:10px;gap:10px}
  main > section{padding:18px}
  .hero{padding:18px;gap:14px}
  .subbar{padding:4px 6px}
  .foot{padding:26px 14px 18px}
}

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