.chess-board {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
      width: 100%;
      max-width: 700px;
      margin: 1.5rem auto;
    }
    @media (max-width: 560px) { .chess-board { grid-template-columns: 1fr; } }
    .chess-player-panel {
      background: var(--bg-surface-subtle);
      border: 3px solid var(--border-color);
      border-radius: var(--radius-xl);
      padding: 2rem 1.5rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.75rem;
      cursor: pointer;
      user-select: none;
      transition: all 0.2s ease;
      position: relative;
      min-height: 220px;
      justify-content: center;
    }
    .chess-player-panel.is-active {
      border-color: var(--accent-emerald);
      background: var(--accent-emerald-light);
      box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.15), var(--shadow-lg);
    }
    .chess-player-panel.is-lost {
      border-color: var(--accent-rose);
      background: var(--accent-rose-light);
      opacity: 0.85;
    }
    .chess-player-name {
      font-size: 0.9rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: var(--text-muted);
    }
    .chess-player-panel.is-active .chess-player-name { color: var(--accent-emerald); }
    .chess-time-display {
      font-size: clamp(2.8rem, 9vw, 4.5rem);
      font-weight: 900;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
      letter-spacing: -0.03em;
      color: var(--text-primary);
      line-height: 1;
    }
    .chess-player-panel.is-active .chess-time-display { color: var(--accent-emerald); }
    .chess-player-panel.is-lost .chess-time-display { color: var(--accent-rose); }
    .chess-tap-hint {
      font-size: 0.8rem;
      color: var(--text-muted);
      font-weight: 600;
    }
    .chess-active-badge {
      position: absolute;
      top: -1px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--accent-emerald);
      color: white;
      font-size: 0.7rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 0.06em;
      padding: 0.25rem 0.75rem;
      border-radius: 0 0 var(--radius-md) var(--radius-md);
      display: none;
    }
    .chess-player-panel.is-active .chess-active-badge { display: block; }
    @media (max-width: 560px) {
      .chess-board {
        grid-template-columns: 1fr;
        gap: 0.75rem;
        margin: 1rem auto;
      }
      .chess-player-panel {
        min-height: 140px;
        padding: 1.25rem 1rem;
        gap: 0.5rem;
      }
      .chess-time-display {
        font-size: clamp(2.4rem, 11vw, 3.5rem);
      }
    }