:root{
  color-scheme: light;
  --bg:#ffffff; --fg:#1f2328; --muted:#656d76; --link:#0969da;
  --border:#d8dee4; --panel:#f6f8fa; --hover:#eaeef2;
  --pill-bg:#ddf4ff; --pill-fg:#0969da; --accent:#0969da;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--fg)}
body{font:15px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",
  Helvetica,Arial,sans-serif}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}

/* ---- Top navigation ---- */
.topbar{background:#fff;border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:100}
.topbar .inner{max-width:1200px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;gap:20px;height:56px}
.topbar .brand{font-weight:700;font-size:17px;color:var(--fg)}
.topbar .brand a{color:inherit}
.topbar .brand a:hover{text-decoration:none}
.topbar .nav{display:flex;gap:2px;flex:1}
.topbar .nav > li{position:relative;list-style:none}
.topbar .nav > li > a,
.topbar .nav > li > button{display:inline-flex;align-items:center;gap:4px;
  padding:8px 12px;border-radius:6px;color:var(--fg);font-size:14px;
  font-weight:500;background:none;border:none;cursor:pointer;
  font-family:inherit}
.topbar .nav > li > a:hover,
.topbar .nav > li > button:hover,
.topbar .nav > li.open > button{background:var(--hover);text-decoration:none}
.topbar .nav > li > a.active{background:var(--pill-bg);color:var(--pill-fg)}
.topbar .nav > li > button::after{content:"▾";font-size:10px;
  color:var(--muted);margin-left:2px}
.topbar ul.nav{padding:0;margin:0}

.dropdown{display:none;position:absolute;top:100%;left:0;
  min-width:280px;max-height:calc(100vh - 80px);overflow-y:auto;
  background:#fff;border:1px solid var(--border);
  border-radius:8px;box-shadow:0 6px 16px rgba(0,0,0,.12);
  padding:6px;list-style:none;margin:4px 0 0;z-index:200}
.topbar .nav > li.open .dropdown{display:block}
.dropdown li{list-style:none}
.dropdown a{display:flex;justify-content:space-between;align-items:center;
  padding:7px 10px;border-radius:5px;color:var(--fg);font-size:14px;
  gap:12px}
.dropdown a:hover{background:var(--hover);text-decoration:none}
.dropdown a.active{background:var(--pill-bg);color:var(--pill-fg);
  font-weight:600}
.dropdown a .n{color:var(--muted);font-size:12px;
  font-variant-numeric:tabular-nums}
.dropdown a.active .n{color:var(--pill-fg)}

.topbar .spacer{flex:1}
.topbar .menu-btn{display:none;background:var(--panel);
  border:1px solid var(--border);border-radius:6px;padding:6px 12px;
  cursor:pointer;font-size:14px}

/* ---- Page layout ---- */
main{max-width:1100px;margin:0 auto;padding:32px 24px}
header.page{margin-bottom:24px}
h1{margin:0 0 6px;font-size:28px;font-weight:600;letter-spacing:-.01em}
.sub{color:var(--muted);font-size:14px}
.intro{color:var(--muted);margin:14px 0 22px;max-width:680px}

/* ---- Homepage groups ---- */
.group{margin-bottom:28px}
.group h2{font-size:16px;font-weight:600;margin:0 0 10px;
  color:var(--muted);text-transform:uppercase;letter-spacing:.06em}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));
  gap:10px}
.cat{background:#fff;border:1px solid var(--border);border-radius:8px;
  padding:14px 16px;transition:all .12s;text-decoration:none;color:var(--fg);
  display:block}
.cat:hover{border-color:var(--accent);text-decoration:none;
  box-shadow:0 1px 3px rgba(0,0,0,.06);transform:translateY(-1px)}
.cat .title{font-weight:600;font-size:15px;color:var(--fg);display:block}
.cat .count{color:var(--muted);font-size:13px;margin-top:4px}

/* ---- Category pages ---- */
.controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;
  margin-bottom:16px;padding:12px 14px;background:var(--panel);
  border:1px solid var(--border);border-radius:8px}
.controls label{font-size:13px;color:var(--muted);font-weight:500}
.controls select,.controls input{padding:7px 11px;background:#fff;
  border:1px solid var(--border);border-radius:6px;color:var(--fg);
  font-size:14px;font-family:inherit}
.controls input.search{flex:1;min-width:220px}

.repo{background:#fff;border:1px solid var(--border);border-radius:8px;
  padding:14px 18px;margin-bottom:8px;transition:border-color .12s}
.repo:hover{border-color:#b6bec6}
.repo .name{font-weight:600;font-size:15px}
.repo .desc{color:var(--fg);font-size:14px;margin-top:4px;opacity:.85;
  line-height:1.5}
.repo .meta{color:var(--muted);font-size:12px;margin-top:8px;
  display:flex;flex-wrap:wrap;gap:4px 12px;align-items:center}
.pill{display:inline-block;background:var(--pill-bg);color:var(--pill-fg);
  border-radius:10px;padding:1px 8px;font-size:11px}

footer{margin-top:48px;padding-top:20px;border-top:1px solid var(--border);
  color:var(--muted);font-size:13px;text-align:center}

@media (max-width:860px){
  .topbar .inner{padding:0 16px;gap:10px}
  .topbar .nav{display:none;position:absolute;top:100%;left:0;right:0;
    background:#fff;border-bottom:1px solid var(--border);
    flex-direction:column;padding:10px;gap:2px}
  .topbar .nav.open{display:flex}
  .topbar .nav > li{width:100%}
  .topbar .nav > li > a,
  .topbar .nav > li > button{width:100%;justify-content:space-between;
    padding:10px 12px}
  .dropdown{position:static;box-shadow:none;border:none;padding:0 0 0 12px;
    display:none}
  .topbar .nav > li.open .dropdown{display:block}
  .topbar .menu-btn{display:inline-block}
  main{padding:20px 16px}
}