@media (max-width: 760px) {
  .ttt-shell {
    width: min(100% - 28px, 1060px);
  }
  .lobby-grid,
  .game-layout {
    grid-template-columns: 1fr;
  }
  .ttt-intro {
    padding-top: 35px;
  }
  .back-link {
    margin-bottom: 34px;
  }
  .panel-copy {
    min-height: 0;
  }
  .game-layout {
    gap: 32px;
  }
  .board-wrap {
    width: min(100%, 520px);
    margin: 0 auto;
  }
  .score-panel {
    width: min(100%, 520px);
    margin: 0 auto;
  }
  .protocol-note {
    margin-top: 52px;
  }
}

@media (max-width: 460px) {
  .site-header {
    width: calc(100% - 28px);
  }
  .ttt-intro h1 {
    font-size: clamp(48px, 16vw, 72px);
  }
  .panel {
    padding: 21px;
  }
  .play-heading {
    align-items: start;
    flex-direction: column;
  }
  .play-meta {
    align-items: start;
  }
  .protocol-note {
    gap: 10px;
    padding: 14px;
  }
}