:root{
  --bg:#fbfbfc;
  --surface:#ffffff;
  --ink:#16181d;
  --muted:#697080;
  --faint:#9aa1ad;
  --line:#e6e8ec;
  --accent:#2f5fe0;
  --radius:16px;
  --maxw:1080px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}

.wrap{
  width:min(var(--maxw),calc(100% - 2.5rem));
  margin-inline:auto;
}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:10;
  background:rgba(251,251,252,.86);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--line);
}
.nav .wrap{
  display:flex;align-items:center;justify-content:space-between;
  gap:1rem;
  padding-block:.95rem;
}
.brand{
  display:inline-flex;align-items:center;gap:.55rem;
  font-weight:650;letter-spacing:-.01em;
}
.logo{
  width:24px;height:24px;border-radius:6px;
  flex:none;
}
.links{display:flex;gap:.4rem;font-size:.94rem}
.links a{
  padding:.35rem .75rem;border-radius:999px;
  color:var(--muted);
  transition:color .18s,background .18s;
}
.links a:hover{color:var(--ink);background:#f0f1f4}
.links a.on{color:var(--accent);background:#eef2fd}

/* ---------- hero ---------- */
.hero{padding-block:clamp(3.5rem,9vw,6.5rem) clamp(2.5rem,6vw,4rem)}
.eyebrow{
  margin:0 0 1rem;
  font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--faint);
}
h1{
  margin:0 0 1.1rem;
  font-size:clamp(2rem,1.2rem + 3.4vw,3.1rem);
  line-height:1.2;letter-spacing:-.025em;font-weight:650;
}
.lede{
  margin:0;max-width:34rem;
  font-size:clamp(1rem,.95rem + .25vw,1.15rem);
  color:var(--muted);
}
.contact{
  margin:.9rem 0 0;
  font-size:.95rem;
  color:var(--faint);
}
.cta{
  display:inline-flex;align-items:center;gap:.5rem;
  margin-top:1.8rem;padding:.7rem 1.35rem;
  background:var(--ink);color:#fff;
  border-radius:999px;font-size:.95rem;
  transition:transform .18s,opacity .18s;
}
.cta:hover{transform:translateY(-2px);opacity:.9}

/* ---------- sections ---------- */
.section{padding-block:clamp(2.5rem,6vw,4.5rem)}
.section+.section{border-top:1px solid var(--line)}
.head{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;margin-bottom:2rem}
h2{margin:0;font-size:clamp(1.25rem,1.05rem + .8vw,1.6rem);letter-spacing:-.015em;font-weight:620}
.head a{font-size:.9rem;color:var(--faint)}
.head a:hover{color:var(--accent)}

/* ---------- grid & cards ---------- */
.grid{display:grid;gap:clamp(1rem,2.5vw,1.5rem);grid-template-columns:repeat(auto-fit,minmax(min(100%,20rem),1fr))}

.card{
  background:var(--surface);
  border-radius:var(--radius);
  overflow:hidden;
  box-shadow:0 1px 2px rgba(22,24,29,.04);
  transition:transform .2s,box-shadow .2s;
}
a.card:hover{transform:translateY(-3px);box-shadow:0 16px 36px -20px rgba(22,24,29,.32)}
.thumb{aspect-ratio:4/3;background:#f2f3f6}
.thumb svg{width:100%;height:100%}
.card .body{padding:1.15rem 1.25rem 1.35rem}
.card h3{margin:0 0 .4rem;font-size:1.05rem;font-weight:600;letter-spacing:-.01em}
.card p{margin:0;font-size:.92rem;color:var(--muted);line-height:1.65}
.tag{
  display:inline-block;margin-bottom:.7rem;
  font-size:.74rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--faint);
}

/* ---------- prose ---------- */
.prose{max-width:38rem}
.prose p{margin:0 0 1.1rem;color:var(--muted)}
.prose p:last-child{margin-bottom:0}
.note{
  margin-top:2.5rem;padding:1.2rem 1.35rem;
  background:var(--surface);border-radius:12px;
  box-shadow:0 1px 2px rgba(22,24,29,.04);
  font-size:.9rem;color:var(--muted);line-height:1.75;
}

/* ---------- note list ---------- */
.list{display:grid;gap:clamp(1.4rem,3vw,2rem)}
.item{
  display:grid;
  grid-template-columns:minmax(0,5.5rem) minmax(0,1fr);
  gap:clamp(1rem,3vw,1.75rem);
  align-items:start;
  padding-bottom:clamp(1.4rem,3vw,2rem);
  border-bottom:1px solid var(--line);
}
.item:last-child{border-bottom:0;padding-bottom:0}
.item .date{font-size:.85rem;color:var(--faint);padding-top:.35rem;white-space:nowrap}
.item h3{
  margin:0 0 .5rem;font-size:clamp(1.05rem,1rem + .5vw,1.3rem);
  font-weight:620;letter-spacing:-.015em;line-height:1.35;
  transition:color .18s;
}
.item:hover h3{color:var(--accent)}
.item p{margin:0;color:var(--muted);font-size:.95rem;max-width:44rem}

/* ---------- article ---------- */
.article{padding-block:clamp(2.5rem,7vw,4.5rem)}
.article .head-line{margin-bottom:clamp(1.5rem,4vw,2.25rem)}
.article h1{font-size:clamp(1.6rem,1.25rem + 2vw,2.4rem);margin-bottom:.7rem}
.byline{font-size:.88rem;color:var(--faint)}
.article .body p{color:#3a3f4a;margin:0 0 1.25rem;max-width:38rem}
.article .body h2{margin:2.4rem 0 1rem;font-size:1.2rem}
.article .body blockquote{
  margin:1.75rem 0;padding-left:1.15rem;
  border-left:2px solid var(--accent);
  color:var(--muted);font-size:.97rem;
}
.back{display:inline-block;margin-top:2.5rem;font-size:.92rem;color:var(--faint)}
.back:hover{color:var(--accent)}

/* ---------- info list ---------- */
.info{display:grid;gap:.55rem;font-size:.95rem}
.info div{display:flex;gap:.9rem}
.info dt{min-width:5.5rem;color:var(--faint)}
.info dd{margin:0;color:var(--ink)}
.info a{border-bottom:1px solid var(--line)}
.info a:hover{color:var(--accent);border-bottom-color:var(--accent)}

/* ---------- footer ---------- */
footer{
  margin-top:clamp(2rem,6vw,4rem);
  border-top:1px solid var(--line);
  background:var(--surface);
  padding-block:1.6rem 1.9rem;
}
footer .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:.4rem 1.4rem;font-size:.86rem;color:var(--faint)}
footer a{color:var(--faint);border-bottom:1px solid transparent}
footer a:hover{color:var(--accent);border-bottom-color:var(--accent)}

@media (max-width:560px){
  .nav .wrap{flex-wrap:wrap;padding-block:.75rem;row-gap:.5rem}
  .links{font-size:.88rem}
  .links a{padding:.3rem .55rem}
  .head{flex-direction:column;align-items:flex-start;gap:.3rem}
  .item{grid-template-columns:minmax(0,1fr);gap:.35rem}
  .item .date{padding-top:0}
  .info div{flex-direction:column;gap:.1rem}
}