:root{
  --c-primary:#1A8CFF;
  --c-bg:#F7FBFF;
  --c-text:#222;
  --c-muted:#5f6b7a;
  --box-r:14px;
  --box-s:0 6px 18px rgba(0,0,0,.07);
  --w-max:1160px;
  --font-main:"Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
body{font-family:var(--font-main);background:var(--c-bg);color:var(--c-text);line-height:1.7}
a{color:var(--c-primary);text-decoration:none}
.wrapper{max-width:var(--w-max);margin:auto;padding:48px 20px}

nav{display:flex;gap:32px;padding:26px 0}
nav a{position:relative;font-weight:500}
nav a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;background:var(--c-primary);transition:.3s}
nav a:hover::after{width:100%}

.hero{
  position:relative;
  height:72vh;
  min-height:520px;
  background:var(--c-primary) url('assets/hero.jpg') center/cover no-repeat;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:flex-start;
  color:#fff;
  border-radius:var(--box-r);
  box-shadow:var(--box-s);
  padding:0 clamp(48px,8vw,120px);
  overflow:hidden;
}
/* 半透明暗色蒙层提高白字可读性 */
.hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:rgba(0,0,0,.35);
  border-radius:var(--box-r);
  z-index:0;
}
.hero>*{position:relative;z-index:1}
.hero h1{font-size:clamp(2.4rem,5vw,3.6rem);margin-bottom:.6rem;text-shadow:0 2px 6px rgba(0,0,0,.25)}
.hero p{font-size:1.35rem;max-width:620px;text-shadow:0 2px 6px rgba(0,0,0,.25)}


.about{margin:88px 0}
.about h2{font-size:1.8rem;margin-bottom:18px}
.about p{font-size:1rem;color:var(--c-text);max-width:800px}

.cards{display:grid;gap:32px;margin-top:72px;grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}
.card{background:#fff;border-radius:var(--box-r);box-shadow:var(--box-s);overflow:hidden;transition:.3s}
.card:hover{transform:translateY(-4px);box-shadow:0 12px 30px rgba(0,0,0,.08)}
.card img{width:100%;height:190px;object-fit:cover}
.card h3{margin:20px 20px 8px;font-size:1.25rem}
.card p{margin:0 20px 24px;color:var(--c-muted);font-size:.95rem}

footer{text-align:center;margin-top:88px;font-size:.875rem;color:var(--c-muted)}
footer small{display:block;margin-top:6px}