/* Shared theme + chrome for Visual Learn Lab. Palette taken from the original catan.html. */
:root{
  --bg:#0e1726; --panel:#16233a; --panel2:#1d2f4d; --ink:#e8eef7; --muted:#93a4bf;
  --line:#2b3f63; --accent:#f4b942; --good:#3fce8f; --bad:#ff6b6b; --sea:#12386b;
  --nav-h:52px;
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);
  font:15px/1.55 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* --- top nav (injected by site.js) --- */
#site-nav{position:sticky;top:0;z-index:100}
.nav{display:flex;align-items:center;gap:6px;min-height:var(--nav-h);padding:5px 16px;flex-wrap:wrap;
  background:rgba(14,23,38,.9);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav .brand{font-weight:800;letter-spacing:.3px;margin-right:10px;white-space:nowrap}
.nav .brand span{color:var(--accent)}
.nav a.navlink{color:var(--muted);font-weight:600;font-size:13px;padding:6px 10px;border-radius:8px;
  white-space:nowrap}
.nav a.navlink:hover{color:var(--ink);background:var(--panel2);text-decoration:none}
.nav a.navlink.active{color:var(--ink);background:var(--panel2);box-shadow:0 0 0 1px var(--line) inset}
.nav .spacer{flex:1}
.nav .navlinks{display:flex;gap:4px;flex-wrap:wrap;align-items:center}
.navgroup{position:relative}
.navbtn{font-family:inherit;color:var(--muted);font-weight:600;font-size:13px;padding:6px 10px;border-radius:8px;
  background:transparent;border:1px solid transparent;cursor:pointer;white-space:nowrap;
  display:inline-flex;align-items:center;gap:5px}
.navbtn:hover{color:var(--ink);background:var(--panel2)}
.navbtn.active{color:var(--ink);background:var(--panel2);box-shadow:0 0 0 1px var(--line) inset}
.navbtn .caret{font-size:10px;opacity:.7;transition:transform .15s}
.navgroup.open .navbtn .caret{transform:rotate(180deg)}
.navmenu{display:none;position:absolute;top:calc(100% + 7px);left:0;min-width:214px;z-index:200;
  flex-direction:column;gap:2px;padding:6px;background:var(--panel);border:1px solid var(--line);
  border-radius:12px;box-shadow:0 14px 34px rgba(0,0,0,.45)}
.navgroup.open .navmenu{display:flex}
.navmenu a.navlink{display:block;padding:8px 11px;border-radius:8px;font-size:13px}

/* --- generic page container (topic pages that aren't full-bleed) --- */
main.page{max-width:1080px;margin:0 auto;padding:26px 20px 60px}
.page h1{margin:.2em 0 .1em;font-size:30px;line-height:1.15}
.page .lede{color:var(--muted);font-size:16px;margin:0 0 22px}
.page h2{margin:30px 0 10px;font-size:15px;letter-spacing:.5px;text-transform:uppercase;color:var(--muted)}

.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px}
.grid{display:grid;gap:14px}
.controls{display:flex;flex-wrap:wrap;gap:14px;align-items:flex-end}
.field{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--muted)}
.field input[type=range]{width:180px;accent-color:var(--accent)}
.field b{color:var(--ink);font-variant-numeric:tabular-nums}

button{background:var(--panel2);color:var(--ink);border:1px solid var(--line);border-radius:8px;
  padding:8px 14px;font-weight:700;cursor:pointer;font-size:13px}
button:hover:not(:disabled){border-color:var(--accent)}
button:disabled{opacity:.4;cursor:not-allowed}
button.primary{background:var(--accent);color:#241a00;border-color:var(--accent)}
.muted{color:var(--muted)}

/* --- homepage --- */
.hero{text-align:center;padding:28px 20px 6px}
.hero h1{font-size:40px;margin:0 0 8px}
.hero h1 span{color:var(--accent)}
.hero p{color:var(--muted);font-size:18px;margin:0}
.stats-strip{display:flex;justify-content:center;gap:34px;flex-wrap:wrap;margin:22px 0 6px;color:var(--muted)}
.stats-strip b{color:var(--ink);font-size:20px;font-variant-numeric:tabular-nums}
.stats-strip .stat{display:flex;flex-direction:column;align-items:center}
.topics{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;
  max-width:1080px;margin:24px auto 0;padding:0 20px 50px}
.topic{position:relative;display:flex;flex-direction:column;gap:8px;min-height:150px;
  background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:18px;
  transition:border-color .15s,transform .15s}
.topic:hover{border-color:var(--accent);transform:translateY(-2px);text-decoration:none}
.topic .emoji{font-size:30px}
.topic h3{margin:0;font-size:18px;color:var(--ink)}
.topic p{margin:0;color:var(--muted);font-size:14px;flex:1}
.topic.soon{opacity:.55;pointer-events:none}
.views{position:absolute;top:14px;right:16px;font-size:12px;color:var(--muted);
  font-variant-numeric:tabular-nums}

.site-foot{border-top:1px solid var(--line);color:var(--muted);font-size:13px;
  text-align:center;padding:22px 16px}
.site-foot .views{position:static}

/* --- expert feedback widget (injected by site.js on topic pages) --- */
.fb-wrap{position:fixed;right:18px;bottom:18px;z-index:300;display:flex;flex-direction:column;align-items:flex-end;gap:10px}
.fb-btn{background:var(--panel2);color:var(--ink);border:1px solid var(--line);border-radius:999px;
  padding:10px 16px;font-weight:700;font-size:13px;cursor:pointer;box-shadow:0 6px 20px rgba(0,0,0,.35)}
.fb-btn:hover{border-color:var(--accent)}
.fb-panel{width:min(360px,92vw);background:var(--panel);border:1px solid var(--line);border-radius:14px;
  padding:14px;box-shadow:0 16px 44px rgba(0,0,0,.55)}
.fb-panel[hidden]{display:none}
.fb-head{display:flex;justify-content:space-between;align-items:center;font-weight:800;margin-bottom:8px}
.fb-x{background:none;border:0;color:var(--muted);font-size:16px;cursor:pointer;line-height:1}
.fb-x:hover{color:var(--ink)}
.fb-note{color:var(--muted);font-size:12.5px;line-height:1.5;margin:0 0 10px}
.fb-in{width:100%;background:var(--panel2);border:1px solid var(--line);border-radius:8px;color:var(--ink);
  padding:8px 10px;font:inherit;font-size:13px;margin-bottom:8px}
.fb-in:focus{outline:none;border-color:var(--accent)}
.fb-text{resize:vertical;min-height:90px}
.fb-actions{display:flex;justify-content:flex-end}
.fb-send{background:var(--accent);color:#241a00;border:0;border-radius:8px;padding:8px 15px;font-weight:700;cursor:pointer}
.fb-done{font-size:13px;line-height:1.5;margin-top:2px}
.fb-done.ok{color:var(--good)}
.fb-done.err{color:var(--bad)}
.fb-done[hidden]{display:none}
.fb-send:disabled{opacity:.6;cursor:default}

@media(max-width:640px){
  .hero h1{font-size:30px}
  .nav .brand{font-size:14px}
}