:root{
  --bg:#f6f7f9; --panel:#ffffff; --line:#e3e6ea; --text:#1a1d21;
  --muted:#6b7280; --accent:#4f46e5; --accent-soft:#eef2ff; --radius:10px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--text);
  font:14px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
a{color:inherit;text-decoration:none}

header{
  position:sticky; top:0; z-index:20; background:var(--panel);
  border-bottom:1px solid var(--line); padding:12px 20px;
  display:flex; align-items:center; gap:16px; flex-wrap:wrap;
}
.logo{font-size:17px;font-weight:700;letter-spacing:-.2px;white-space:nowrap}
.logo span{color:var(--accent)}
.count{font-size:12px;color:var(--muted);white-space:nowrap}
.search{
  flex:1; min-width:180px; max-width:420px; padding:8px 12px;
  border:1px solid var(--line); border-radius:var(--radius);
  background:#fbfbfc; font-size:14px; outline:none;
}
.search:focus{border-color:var(--accent);background:#fff}

.layout{display:flex;align-items:flex-start;gap:0}
nav{
  width:180px; flex:none; position:sticky; top:57px; height:calc(100vh - 57px);
  overflow-y:auto; padding:14px 10px; border-right:1px solid var(--line);
  background:var(--panel);
}
nav button{
  display:flex; justify-content:space-between; width:100%; gap:8px;
  padding:7px 10px; margin-bottom:2px; border:0; border-radius:8px;
  background:transparent; font:inherit; color:var(--text); cursor:pointer; text-align:left;
}
nav button:hover{background:#f1f2f4}
nav button.on{background:var(--accent-soft);color:var(--accent);font-weight:600}
nav button i{font-style:normal;color:var(--muted);font-size:12px}
nav button.on i{color:var(--accent)}

main{flex:1;min-width:0;padding:16px 20px 60px}
.bar{display:flex;align-items:center;gap:10px;margin-bottom:14px;flex-wrap:wrap}
.bar h2{margin:0;font-size:15px;font-weight:600}
.bar .hint{font-size:12px;color:var(--muted)}

.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px}
.card{
  background:var(--panel); border:1px solid var(--line); border-radius:12px;
  overflow:hidden; display:flex; flex-direction:column;
}
.stage{
  height:190px; background:
    linear-gradient(45deg,#fafafa 25%,transparent 25%,transparent 75%,#fafafa 75%),
    linear-gradient(45deg,#fafafa 25%,transparent 25%,transparent 75%,#fafafa 75%) 10px 10px,
    #fff;
  background-size:20px 20px;
  display:flex; align-items:center; justify-content:center; overflow:hidden;
}
.stage iframe{width:100%;height:100%;border:0;display:block}
.info{padding:9px 12px;border-top:1px solid var(--line);min-height:62px}
.info .t{font-size:13px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.info .m{font-size:11px;color:var(--muted);margin-top:2px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tags{display:flex;gap:4px;flex-wrap:wrap;margin-top:6px}
.tags b{
  font-weight:500;font-size:10px;padding:1px 6px;border-radius:99px;
  background:#f1f2f4;color:var(--muted);
}
.acts{display:flex;gap:6px;padding:0 12px 10px}
.acts button{
  flex:1;padding:6px;border:1px solid var(--line);border-radius:8px;
  background:#fff;font:inherit;font-size:12px;cursor:pointer;color:var(--text);
}
.acts button:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}
.empty{padding:60px 0;text-align:center;color:var(--muted)}
.top{position:fixed;right:22px;bottom:22px;padding:9px 14px;border:1px solid var(--line);
  border-radius:99px;background:#fff;cursor:pointer;box-shadow:0 4px 14px rgba(0,0,0,.08);font-size:12px}

@media(max-width:720px){
  nav{position:static;width:auto;height:auto;border-right:0;border-bottom:1px solid var(--line);
      display:flex;overflow-x:auto;white-space:nowrap;padding:8px}
  nav button{width:auto;margin:0 4px 0 0}
  .layout{display:block}
}