:root {
  --bg: #070b12;
  --card: #0e1624;
  --line: #1c2c44;
  --text: #e7eefc;
  --muted: #8aa0bd;
  --gold: #c9a227;
  --cyan: #22d3ee;
  --good: #3dd68c;
  --bad: #f87171;
  font-family: "Segoe UI", system-ui, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; color: var(--text);
  background:
    radial-gradient(900px 500px at 0% -10%, #132038 0%, transparent 55%),
    radial-gradient(700px 400px at 100% 0%, #1a1230 0%, transparent 50%),
    var(--bg);
}
.top { padding: 2rem 1.5rem 1rem; max-width: 1100px; margin: 0 auto; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.eyebrow { color: var(--gold); letter-spacing: .2em; text-transform: uppercase; font-size: .72rem; margin-bottom: .4rem; }
h1 { margin: 0 0 .4rem; font-size: clamp(1.6rem, 3vw, 2.2rem); }
.sub, .muted { color: var(--muted); }
.session { font-size: .85rem; }
.grid { max-width: 1100px; margin: 0 auto; padding: 0 1.5rem 3rem; display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.card { background: rgba(14,22,36,.95); border: 1px solid var(--line); border-radius: 14px; padding: 1rem 1.1rem; }
.card.wide { grid-column: 1 / -1; }
.card.hidden { display: none; }
.card h2 { margin: 0 0 .6rem; font-size: 1.05rem; }
.subhead { margin: 1rem 0 .35rem; font-size: .9rem; color: var(--cyan); }
.token-box {
  margin-top: .75rem; padding: .75rem; border: 1px solid rgba(201,162,39,.4);
  border-radius: 10px; background: rgba(201,162,39,.08);
}
.token-box code {
  display: block; margin: .5rem 0; word-break: break-all;
  font-size: .72rem; color: #ffd484;
}
.token-box.hidden { display: none; }
.card.locked { position: relative; }
.lock-banner {
  margin-bottom: .75rem; padding: .55rem .75rem; border-radius: 8px;
  background: rgba(248,113,113,.12); border: 1px solid rgba(248,113,113,.35);
  color: #fecaca; font-size: .85rem; font-weight: 600;
}
.lock-banner.hidden { display: none; }
.card.locked .catalog { opacity: .35; pointer-events: none; filter: grayscale(.4); }
input {
  width: 100%; margin: .35rem 0; padding: .7rem .8rem; border-radius: 8px;
  border: 1px solid var(--line); background: #080e18; color: var(--text);
}
button, .primary, .ghost {
  border: 0; border-radius: 999px; padding: .65rem 1rem; font-weight: 700; cursor: pointer;
}
.primary { background: linear-gradient(135deg, #2563eb, #0891b2); color: #fff; margin-top: .5rem; }
.ghost { background: transparent; border: 1px solid var(--line); color: var(--text); }
.msg { font-size: .85rem; min-height: 1.2em; }
.msg.ok { color: var(--good); }
.msg.err { color: var(--bad); }
.pill { font-size: .65rem; background: #152238; color: var(--cyan); padding: .15rem .5rem; border-radius: 999px; }
.catalog { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: .7rem; }
.game {
  text-align: left; border: 1px solid var(--line); background: #101b2d; border-radius: 12px;
  padding: .8rem; color: inherit; cursor: pointer;
}
.game:hover { border-color: #3b567f; }
.game.disabled { opacity: .45; cursor: not-allowed; }
.game strong { display: block; margin-bottom: .25rem; }
.game span { font-size: .78rem; color: var(--muted); }
.board { font: .78rem/1.5 ui-monospace, monospace; max-height: 220px; overflow: auto; }
.play-head { display: flex; justify-content: space-between; align-items: center; gap: .5rem; }
.ttt { display: grid; grid-template-columns: repeat(3, 72px); gap: .4rem; margin: 1rem 0; }
.ttt button {
  width: 72px; height: 72px; font-size: 1.6rem; border-radius: 10px;
  background: #080e18; border: 1px solid var(--line); color: var(--text);
}
.c4 { display: grid; grid-template-columns: repeat(7, 40px); gap: .25rem; margin: 1rem 0; }
.c4 .cell {
  width: 40px; height: 40px; border-radius: 50%; background: #080e18; border: 1px solid var(--line);
}
.c4 .cell.H { background: #2563eb; }
.c4 .cell.A { background: var(--gold); }
.c4-cols { display: flex; gap: .25rem; margin-bottom: .4rem; }
.c4-cols button { width: 40px; padding: .3rem; font-size: .7rem; }
.foot { text-align: center; color: var(--muted); font-size: .75rem; padding: 1rem; }
@media (max-width: 800px) { .grid { grid-template-columns: 1fr; } }