/* Caro — trên nền hệ giao diện ts.css */
:root { --x: var(--accent); --o: var(--rose); }
.crumb { color: var(--muted); font-size: 13px; }

/* ---- Menu ---- */
.menu { padding-top: 40px; padding-bottom: 48px; }
.menu-hero { text-align: center; display: flex; flex-direction: column; align-items: center; }
.menu-title { font-size: clamp(72px, 16vw, 140px); margin-top: 20px; }
.menu-hero .ts-lead { max-width: 560px; margin: 16px auto 0; }
.name-box { max-width: 360px; margin: 32px auto 0; }
.modes { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 28px; }
.mode { padding: 22px; display: flex; flex-direction: column; gap: 10px; transition: transform .2s, box-shadow .2s, border-color .2s; }
.mode:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); border-color: var(--accent-ring); }
.mode-ico { width: 44px; height: 44px; display: grid; place-items: center; font-size: 22px; border-radius: 12px; background: var(--accent-soft); }
.mode h2 { margin: 4px 0 0; font-size: 19px; font-weight: 800; letter-spacing: -.02em; }
.mode p { margin: 0 0 6px; color: var(--text-2); font-size: 14px; flex: 1; }
.levels { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.join { display: flex; gap: 8px; }
.join .ts-input { text-transform: uppercase; letter-spacing: .2em; min-width: 0; }
.error { text-align: center; color: var(--rose); min-height: 1.5em; font-size: 14px; }

/* ---- Bàn chơi ---- */
.play { display: flex; gap: 20px; align-items: flex-start; justify-content: center; padding-top: 20px; padding-bottom: 32px; }
@media (max-width: 960px) { .play { flex-direction: column; align-items: center; padding-top: 12px; } }
.board-wrap { padding: 10px; }
.board {
  --n: 15;
  --cell: min(calc((100vw - 58px) / var(--n)), calc((100vh - 120px) / var(--n)), 40px);
  display: grid; grid-template-columns: repeat(var(--n), var(--cell)); position: relative;
  border-top: 1px solid var(--border-strong); border-left: 1px solid var(--border-strong); border-radius: 4px; background: var(--surface);
}
@media (max-width: 960px) { .board { --cell: min(calc((100vw - 58px) / var(--n)), 40px); } }
.cell {
  width: var(--cell); height: var(--cell); border: 0; padding: 0; background: transparent;
  border-right: 1px solid var(--border-strong); border-bottom: 1px solid var(--border-strong);
  font-family: var(--mono); font-weight: 800; font-size: calc(var(--cell) * .74); line-height: 1; display: grid; place-items: center;
  cursor: pointer; transition: background .12s;
}
.cell:hover:empty { background: var(--accent-soft); }
.cell.x { color: var(--x); }
.cell.o { color: var(--o); }
.cell.x, .cell.o { animation: drop .18s ease-out; }
@keyframes drop { from { transform: scale(.4); opacity: 0; } }
.cell.last { background: var(--warn-soft); box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--warn) 60%, transparent); }
.cell.win { background: var(--ok); color: #fff; animation: win .5s ease both; }
@keyframes win { 50% { transform: scale(1.18); border-radius: 8px; } }

.side { width: 100%; max-width: 330px; display: flex; flex-direction: column; gap: 12px; }
@media (max-width: 960px) { .side { max-width: 640px; } }
.vs { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.player { display: flex; align-items: center; gap: 8px; min-width: 0; flex: 1; padding: 6px 8px; border-radius: 10px; border: 1px solid transparent; transition: all .2s; }
.player.right { justify-content: flex-end; }
.player .pname { font-weight: 600; font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.player.active { background: var(--surface-2); border-color: var(--border-strong); }
.player.active .mark { box-shadow: 0 0 0 3px var(--accent-soft); }
.mark { flex: none; width: 28px; height: 28px; border-radius: 8px; display: grid; place-items: center; font-family: var(--mono); font-weight: 800; }
.mark-x { color: var(--x); background: var(--accent-soft); }
.mark-o { color: var(--o); background: var(--rose-soft); }
.score { font-size: 22px; font-weight: 700; display: flex; gap: 6px; }
.score i { color: var(--muted); font-style: normal; }
.status {
  margin-top: 14px; text-align: center; font-weight: 600; font-size: 14px; padding: 9px 12px; border-radius: 10px;
  background: var(--accent-soft); color: var(--accent);
}
.status.done { background: var(--ok-soft); color: var(--ok); }
.share-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.room-id { font-size: 24px; letter-spacing: .25em; color: var(--accent); }
.actions { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.actions .ts-btn { padding: 0 8px; }
.chat-log { height: 160px; overflow-y: auto; font-size: 14px; display: flex; flex-direction: column; gap: 6px; margin-bottom: 10px; }
.chat-log .msg { padding: 6px 10px; border-radius: 10px; background: var(--surface-2); max-width: 90%; word-wrap: break-word; }
.chat-log .msg b { font-size: 12px; display: block; }
.chat-log .msg.X b { color: var(--x); }
.chat-log .msg.O b { color: var(--o); }
.chat-log .empty { color: var(--muted); font-size: 13px; margin: auto; }
.chat-form { display: flex; gap: 8px; }
.chat-form .ts-input { min-width: 0; }
.rule { font-size: 11px; color: var(--muted); margin: 0; }

/* Dòng trạng thái bộ nhớ của máy */
.brain-info { margin-top: 6px; font: 500 12px/1.4 var(--mono, monospace); color: var(--muted, #64748b); text-align: center; }