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

:root{
  --paper:#ffffff;
  --mist:#f5f5f7;
  --ink:#1f1f1f;
  --ink-2:#3a3a3a;
  --ink-soft:#6b6b6b;
  --line:#e5e5e8;
  --r:24px;
  --r-sm:10px;
  --shadow:0 4px 6px rgba(0,0,0,.05), 0 20px 44px -28px rgba(0,0,0,.22);
  --serif:'Cinzel','Songti SC','Noto Serif SC',Georgia,serif;
  --sans:'Josefin Sans',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(--mist);
  color:var(--ink);
  font:400 17px/1.75 var(--sans);
  overflow-x:hidden;
}

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

a{color:inherit;text-decoration:none}

h1,h2,h3{
  font-family:var(--serif);
  font-weight:600;
  line-height:1.28;
  letter-spacing:.02em;
  margin:0 0 .6em;
}

p{margin:0 0 1em}
p:last-child{margin-bottom:0}

:focus-visible{outline:2px solid var(--ink);outline-offset:3px;border-radius:6px}

/* ---------- 顶部：分列菜单 + 居中品牌 ---------- */

.top{
  position:sticky;
  top:0;
  z-index:40;
  background:rgba(255,255,255,.9);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line);
}

.top-row{
  display:grid;
  grid-template-columns:auto 1fr auto 1fr auto;
  align-items:center;
  gap:6px;
  max-width:1240px;
  margin:0 auto;
  padding:8px clamp(12px,2vw,20px);
}

.burger{
  width:44px;
  height:44px;
  padding:0;
  display:grid;
  place-content:center;
  gap:6px;
  background:transparent;
  border:1px solid var(--line);
  border-radius:12px;
  cursor:pointer;
}

.burger span{
  display:block;
  width:18px;
  height:1.5px;
  background:var(--ink);
  transition:transform .32s ease,opacity .32s ease;
}

body.menu-open .burger span:first-child{transform:translateY(3.75px) rotate(45deg)}
body.menu-open .burger span:last-child{transform:translateY(-3.75px) rotate(-45deg)}

.top-tail{display:block;width:44px;height:44px}

.brand{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:8px 12px;
  font-family:var(--serif);
  font-size:1rem;
  letter-spacing:.16em;
  white-space:nowrap;
}

.brand img{width:26px;height:26px;border-radius:8px;object-fit:cover}

.split ol{
  display:flex;
  list-style:none;
  margin:0;
  padding:0;
  gap:2px;
}

.nav-left ol{justify-content:flex-end}
.nav-right ol{justify-content:flex-start}

.split a{
  display:block;
  padding:12px 10px;
  font-size:16px;
  letter-spacing:.02em;
  position:relative;
  white-space:nowrap;
}

.split a::after{
  content:'';
  position:absolute;
  left:10px;
  right:10px;
  bottom:7px;
  height:1px;
  background:currentColor;
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .3s ease;
}

.split a:hover::after{transform:scaleX(1)}

/* ---------- 二级粘性锚点条 ---------- */

.chipbar{
  border-top:1px solid var(--line);
  background:rgba(245,245,247,.94);
}

.chipbar ol{
  display:flex;
  gap:8px;
  list-style:none;
  max-width:1240px;
  margin:0 auto;
  padding:8px clamp(12px,2vw,20px);
  overflow-x:auto;
  scrollbar-width:thin;
}

.chipbar a{
  display:block;
  padding:10px 14px;
  font-size:16px;
  white-space:nowrap;
  border-radius:999px;
  background:var(--paper);
  box-shadow:0 1px 2px rgba(0,0,0,.06);
  transition:background .25s ease,color .25s ease;
}

.chipbar a:hover{background:var(--ink);color:var(--paper)}

/* ---------- 全屏遮罩菜单 ---------- */

.overlay{
  position:fixed;
  inset:0;
  z-index:35;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:96px clamp(20px,6vw,64px) 40px;
  overflow-y:auto;
  background:var(--paper);
  visibility:hidden;
  transform:translateY(-102%);
  transition:transform .46s cubic-bezier(.2,.7,.2,1),visibility .46s;
}

body.menu-open .overlay{visibility:visible;transform:none}

.overlay ol{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:2px;
  width:min(560px,100%);
}

.overlay a{
  display:block;
  padding:16px 6px;
  font-family:var(--serif);
  font-size:1.35rem;
  letter-spacing:.05em;
  border-bottom:1px solid var(--line);
}

.overlay a:hover{opacity:.6}

/* ---------- 首屏 ---------- */

.hero{
  display:grid;
  grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);
  align-items:center;
  gap:clamp(18px,3vw,34px);
  min-height:45vh;
  max-width:1240px;
  margin:0 auto;
  padding:24px clamp(16px,2.4vw,26px) 32px;
  background-image:radial-gradient(rgba(31,31,31,.1) 1px,transparent 1px);
  background-size:22px 22px;
  background-position:center;
}

.hero-art{
  position:relative;
  min-height:280px;
  border-radius:var(--r);
  overflow:hidden;
  background:var(--paper);
  box-shadow:var(--shadow);
}

.hero-art img{
  width:100%;
  height:100%;
  min-height:280px;
  object-fit:cover;
  will-change:transform;
}

.hero-copy{text-align:right}

.eyebrow{
  font-size:16px;
  letter-spacing:.3em;
  color:var(--ink-soft);
  margin:0 0 12px;
}

.hero h1{
  font-size:clamp(1.8rem,3.8vw,2.9rem);
  margin:0 0 14px;
}

.lede{
  margin:0;
  color:var(--ink-2);
  font-size:17px;
  max-width:46ch;
  margin-left:auto;
}

/* ---------- 正文 + 右侧栏 ---------- */

.wrap{
  display:grid;
  grid-template-columns:minmax(0,1fr) 284px;
  gap:clamp(16px,2vw,26px);
  align-items:start;
  max-width:1240px;
  margin:0 auto;
  padding:8px clamp(16px,2.4vw,26px) 64px;
}

.body-col{min-width:0}

div{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:16px;
}

.art-head{grid-column:1/-1;padding:4px 2px 8px}

.art-head h2{font-size:clamp(1.35rem,2.4vw,1.85rem);margin:0 0 8px}
.subtitle{margin:0;color:var(--ink-soft)}

div > article{
  grid-column:span 1;
  min-width:0;
  background:var(--paper);
  border-radius:var(--r);
  padding:clamp(20px,2.2vw,28px);
  box-shadow:var(--shadow);
  scroll-margin-top:132px;
  transition:transform .35s cubic-bezier(.2,.7,.2,1);
}

div > article:nth-child(2){grid-column:1/-1}
div > article:nth-child(3n+5){grid-column:1/-1}
div > article:hover{transform:scale(1.012)}

div > article h2{font-size:1.18rem;margin:0 0 12px}
div > article h3{
  font-family:var(--sans);
  font-weight:600;
  font-size:1.02rem;
  letter-spacing:.05em;
  margin:1.4em 0 .5em;
}
div > article p{color:var(--ink-2)}
div > article ul,
div > article ol{padding-left:1.25em;margin:0 0 1em}
div > article li{margin:.35em 0}
div > article a{text-decoration:underline;text-underline-offset:3px}

.side{
  position:sticky;
  top:132px;
  background:var(--paper);
  border-radius:var(--r);
  padding:20px 20px 16px;
  box-shadow:var(--shadow);
}

.side-title{
  font-size:.98rem;
  letter-spacing:.14em;
  margin:0 0 10px;
}

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

.toc li{counter-increment:toc}

.toc a{
  display:block;
  padding:9px 0;
  font-size:16px;
  border-bottom:1px solid var(--line);
}

.toc a::before{
  content:counter(toc,decimal-leading-zero);
  margin-right:10px;
  font-size:14px;
  letter-spacing:.1em;
  color:var(--ink-soft);
}

.toc a:hover{color:var(--ink-soft)}

.to-top{margin:14px 0 0;font-size:16px}
.to-top a{display:inline-block;padding:8px 0;border-bottom:1px solid var(--ink)}

/* ---------- 页脚 ---------- */

.site-foot{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:14px 20px;
  padding:48px clamp(18px,5vw,72px) 34px;
  background:var(--ink);
  color:var(--paper);
}

.foot-cta{
  grid-column:1/-1;
  margin:0 0 10px;
  font-family:var(--serif);
  font-size:clamp(1.5rem,4vw,2.5rem);
  letter-spacing:.08em;
  line-height:1.2;
}

.foot-copy{font-size:16px;opacity:.66;align-self:center}

.foot-links{
  display:flex;
  flex-wrap:wrap;
  gap:4px 16px;
  margin:0;
  font-size:16px;
}

.foot-links a{display:inline-block;padding:8px 0;opacity:.86;transition:opacity .25s ease}
.foot-links a:hover{opacity:.5}

/* ---------- 入场动画 ---------- */

.reveal{opacity:0;transform:translateY(16px)}
.reveal.in{
  opacity:1;
  transform:none;
  transition:opacity .6s ease,transform .6s cubic-bezier(.2,.7,.2,1);
}

/* ---------- 响应式 ---------- */

@media (max-width:1080px){
  .split{display:none}
  .top-row{grid-template-columns:auto 1fr auto}
  .brand{justify-self:center}
}

@media (max-width:980px){
  .wrap{grid-template-columns:minmax(0,1fr)}
  .side{position:static;top:auto}
  div{grid-template-columns:minmax(0,1fr)}
  div > article,
  div > article:nth-child(2),
  div > article:nth-child(3n+5){grid-column:1/-1}
  .site-foot{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:760px){
  .hero{
    grid-template-columns:minmax(0,1fr);
    min-height:0;
    padding-top:16px;
  }
  .hero-art{min-height:184px}
  .hero-art img{min-height:184px}
  .hero h1{font-size:clamp(1.55rem,7.2vw,2.1rem)}
  .lede{max-width:none}
  .site-foot{padding-bottom:28px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
  .hero-art img{transform:none!important}
  *,*::before,*::after{
    transition-duration:.01ms!important;
    animation-duration:.01ms!important;
  }
}

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