:root{
  --ink:#1f2a44; --muted:#5b6478; --line:#e3e7ef;
  --bg:#f6f7fb; --card:#ffffff; --accent:#3a5bbf; --accent-soft:#eaf0ff;
}
*{box-sizing:border-box;}
body{margin:0;font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;}
a{color:inherit;text-decoration:none;}

/* header */
.site-header{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:18px;
  padding:12px 22px;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);}
.brand{font-size:22px;font-weight:700;letter-spacing:3px;color:var(--accent);}
.topnav{display:flex;gap:6px;flex-wrap:wrap;margin-left:auto;}
.topnav a{padding:6px 12px;border-radius:8px;color:var(--muted);font-size:15px;transition:.2s;}
.topnav a:hover{background:var(--accent-soft);color:var(--accent);}
.menu-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);
  border-radius:8px;font-size:18px;padding:4px 10px;cursor:pointer;}

/* layout */
.container{max-width:1120px;margin:0 auto;padding:28px 20px 60px;}
.grid{display:grid;gap:18px;}
.cat-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));}
.sub-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));}
.work-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));}

/* hero */
.hero{text-align:center;padding:46px 16px 34px;}
.hero h1{font-size:46px;letter-spacing:10px;margin:0 0 8px;color:var(--accent);}
.hero-sub{font-size:18px;color:var(--muted);margin:0 0 10px;}
.hero-desc{color:var(--muted);max-width:620px;margin:0 auto;}

/* cards */
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px 20px;
  transition:.2s;box-shadow:0 1px 2px rgba(20,30,60,.04);}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 22px rgba(20,30,60,.10);}
.card h3{margin:0 0 6px;font-size:19px;}
.card h3 a{color:var(--ink);}
.sub-list{color:var(--muted);font-size:14px;margin:0;}
.sub-list a{color:var(--accent);}

/* section title + breadcrumb */
.section-title{font-size:26px;margin:14px 0 18px;color:var(--ink);}
.breadcrumb{color:var(--muted);font-size:14px;margin-bottom:8px;}
.breadcrumb a{color:var(--accent);}

/* work grid */
.work{display:block;background:var(--card);border:1px solid var(--line);border-radius:12px;
  overflow:hidden;text-align:center;transition:.2s;}
.work:hover{transform:translateY(-3px);box-shadow:0 8px 22px rgba(20,30,60,.12);}
.work img{width:100%;height:170px;object-fit:cover;display:block;background:#eef1f6;}
.work-no{display:block;padding:8px;font-size:14px;color:var(--muted);}

/* artwork detail */
.art-detail{display:flex;flex-direction:column;align-items:center;gap:14px;padding:10px 0;}
.art-figure{margin:0;max-width:760px;width:100%;}
.art-figure img{width:100%;height:auto;border-radius:12px;box-shadow:0 6px 24px rgba(20,30,60,.12);}
.back{margin-top:18px;}
.back a{color:var(--accent);}
.host-text{max-width:760px;color:var(--muted);}

/* cta + footer */
.host-cta{text-align:center;margin:34px 0 10px;}
.btn{display:inline-block;padding:11px 26px;border-radius:30px;background:var(--accent);
  color:#fff;font-size:15px;transition:.2s;}
.btn:hover{opacity:.9;}
.site-footer{text-align:center;color:var(--muted);font-size:13px;padding:26px 16px 40px;
  border-top:1px solid var(--line);margin-top:30px;}

/* responsive */
@media (max-width:720px){
  .menu-toggle{display:block;}
  .topnav{display:none;position:absolute;top:58px;right:14px;flex-direction:column;
    background:#fff;border:1px solid var(--line);border-radius:12px;padding:8px;min-width:150px;
    box-shadow:0 10px 30px rgba(20,30,60,.15);}
  .topnav.open{display:flex;}
  .hero h1{font-size:34px;letter-spacing:6px;}
}