:root{
  --a-bg:#FFFFFF;
  --a-primary:#007AFF;
  --a-text:#333333;
  --a-muted:#666666;
  --a-border:rgba(0,0,0,.10);
  --a-shadow:0 10px 30px rgba(0,0,0,.08);
  --a-radius-card:8px;
  --a-radius-btn:4px;
  --a-max:1200px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--a-bg);
  color:var(--a-text);
  line-height:1.6;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:4px}

.a-container{max-width:var(--a-max);margin:0 auto;padding:0 24px}
.a-section{padding:56px 0}
.a-section--tight{padding:40px 0}

.a-top{
  position:sticky;
  top:0;
  z-index:40;
  background:rgba(255,255,255,.86);
  backdrop-filter:saturate(180%) blur(12px);
  border-bottom:1px solid var(--a-border);
}
.a-top__bar{height:72px;display:flex;align-items:center;justify-content:space-between;gap:14px}
.a-brand{display:flex;align-items:center;gap:10px;min-width:0}
.a-brand__logo{width:36px;height:36px;border-radius:8px;overflow:hidden;border:1px solid var(--a-border);background:#fff}
.a-brand__name{font-weight:800;letter-spacing:-.01em;white-space:nowrap}

.a-nav{display:flex;align-items:center;gap:18px}
.a-nav__a{font-weight:600;color:var(--a-text);padding:10px 8px;border-radius:8px}
.a-nav__a:hover{text-decoration:none;background:rgba(0,122,255,.08)}
.a-top__right{display:flex;align-items:center;gap:10px}
.a-menu{display:none;align-items:center;justify-content:center;width:40px;height:40px;border-radius:8px;border:1px solid var(--a-border);background:#fff;color:var(--a-text)}

.a-btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:10px 14px;border-radius:var(--a-radius-btn);border:1px solid transparent;font-weight:700;cursor:pointer;white-space:nowrap}
.a-btn--primary{background:var(--a-primary);color:#fff}
.a-btn--primary:hover{text-decoration:none;filter:brightness(1.03)}
.a-btn--ghost{background:#fff;border-color:var(--a-border);color:var(--a-text)}
.a-btn--ghost:hover{text-decoration:none;background:rgba(0,0,0,.03)}
.a-btn--block{width:100%}

.a-hero{padding:60px 0 56px 0}
.a-hero__inner{text-align:center}
.a-h1{margin:0;font-size:44px;line-height:1.12;letter-spacing:-.02em}
.a-lead{margin:16px auto 0;max-width:70ch;color:var(--a-muted);font-size:16px}
.a-hero__actions{margin-top:18px;display:flex;gap:10px;justify-content:center;flex-wrap:wrap}
.a-hero__media{margin-top:28px;border-radius:12px;border:1px solid var(--a-border);box-shadow:var(--a-shadow);overflow:hidden}

.a-subhead{display:flex;align-items:flex-end;justify-content:space-between;gap:14px;flex-wrap:wrap}
.a-h2{margin:0;font-size:28px;letter-spacing:-.02em}
.a-muted{color:var(--a-muted)}

.a-grid{display:grid;gap:16px}
.a-grid--3{grid-template-columns:repeat(3,1fr)}
.a-grid--4{grid-template-columns:repeat(4,1fr)}
.a-grid--2{grid-template-columns:repeat(2,1fr)}

.a-card{border-radius:var(--a-radius-card);border:1px solid var(--a-border);background:#fff;box-shadow:0 10px 24px rgba(0,0,0,.06)}
.a-card__inner{padding:18px}
.a-row{display:flex;gap:14px;align-items:flex-start}
.a-ico{
  width:40px;height:40px;border-radius:10px;flex:0 0 auto;
  display:flex;align-items:center;justify-content:center;
  background:rgba(0,122,255,.10);
  border:1px solid rgba(0,122,255,.18);
  color:var(--a-primary);
}
.a-ico svg{width:20px;height:20px}
.a-title{margin:0;font-size:16px;font-weight:800;letter-spacing:-.01em}
.a-desc{margin:8px 0 0;color:var(--a-muted);font-size:14px;line-height:1.7}
.a-card__actions{margin-top:12px;display:flex;gap:10px;flex-wrap:wrap}

.a-fun{font-size:20px;line-height:1}
.a-f-title{margin:10px 0 0;font-weight:800}
.a-f-desc{margin:8px 0 0;color:var(--a-muted);font-size:14px;line-height:1.7}

.a-news{display:grid;gap:14px;margin-top:18px}
.a-news__item{display:grid;grid-template-columns:220px 1fr;gap:16px;align-items:start}
.a-news__img{border-radius:8px;border:1px solid var(--a-border);overflow:hidden;background:#f6f6f6}
.a-news__img img{width:100%;height:140px;object-fit:cover}
.a-news__t{margin:0;font-size:16px;font-weight:800;letter-spacing:-.01em}
.a-news__meta{margin-top:8px;color:var(--a-muted);font-size:12px}
.a-news__d{margin-top:10px;color:var(--a-muted);font-size:14px;line-height:1.7}

.a-prose{color:var(--a-text)}
.a-prose p{margin:0 0 16px}
.a-prose a{color:var(--a-primary);text-decoration:none}
.a-prose a:hover{text-decoration:underline;text-underline-offset:4px}
.a-prose img{border-radius:8px;border:1px solid var(--a-border)}
.a-prose blockquote{margin:18px 0;padding:14px 16px;border-left:4px solid var(--a-primary);background:rgba(0,122,255,.06);border-radius:8px;color:var(--a-text)}

.a-pn{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:18px}

.a-pagination{margin-top:18px;display:flex;justify-content:center;flex-wrap:wrap;gap:8px}
.a-pagination a,.a-pagination span{display:inline-flex;align-items:center;justify-content:center;min-width:40px;height:40px;padding:0 12px;border-radius:8px;border:1px solid var(--a-border);background:#fff;color:var(--a-text);font-weight:800;text-decoration:none}
.a-pagination a:hover{background:rgba(0,0,0,.03)}
.a-pagination .cur,.a-pagination .current{background:var(--a-primary);border-color:var(--a-primary);color:#fff}

.a-footer{border-top:1px solid var(--a-border);padding:56px 0 24px 0}
.a-footer__grid{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:18px}
.a-ft{font-weight:900;letter-spacing:-.01em}
.a-fl{list-style:none;margin:12px 0 0;padding:0;display:grid;gap:10px}
.a-fl a{color:var(--a-muted);text-decoration:none;font-weight:600}
.a-fl a:hover{color:var(--a-text);text-decoration:underline}
.a-sub{margin-top:22px;padding-top:16px;border-top:1px solid var(--a-border);display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:var(--a-muted);font-size:12px}

@media (max-width: 980px){
  .a-grid--4{grid-template-columns:repeat(2,1fr)}
  .a-grid--3{grid-template-columns:repeat(2,1fr)}
  .a-footer__grid{grid-template-columns:1fr 1fr}
  .a-news__item{grid-template-columns:1fr}
  .a-news__img img{height:180px}
  .a-pn{grid-template-columns:1fr}
}

@media (max-width: 760px){
  .a-h1{font-size:34px}
  .a-section{padding:44px 0}
  .a-menu{display:inline-flex}
  .a-nav{position:absolute;left:0;right:0;top:72px;display:none;flex-direction:column;align-items:stretch;gap:0;background:rgba(255,255,255,.96);border-bottom:1px solid var(--a-border);padding:10px 16px}
  .a-nav--open{display:flex}
  .a-nav__a{padding:12px 12px}
  .a-hero__actions{flex-direction:column}
  .a-hero__actions .a-btn{width:100%}
  .a-grid--2{grid-template-columns:1fr}
  .a-grid--3{grid-template-columns:1fr}
  .a-grid--4{grid-template-columns:1fr}
  .a-footer__grid{grid-template-columns:1fr}
}