body {
      font-family: 'Noto Sans JP', sans-serif;
      background-color: #121214;
      color: #e4e4e7;
    }
    .serif-font {
      font-family: 'Noto Serif JP', serif;
    }
    .bg-japanese-pattern {
      background-color: #1a1a1e;
      background-image: radial-gradient(#2d2d34 1px, transparent 0), radial-gradient(#2d2d34 1px, transparent 0);
      background-size: 24px 24px;
      background-position: 0 0, 12px 12px;
    }
    .shake {
      animation: shake 0.5s ease-in-out;
    }
    @keyframes shake {
      0%, 100% { transform: translateX(0); }
      10%, 30%, 50%, 70%, 90% { transform: translateX(-6px); }
      20%, 40%, 60%, 80% { transform: translateX(6px); }
    }
    .pulse-fast {
      animation: pulse 0.5s infinite alternate;
    }
    @keyframes pulse {
      0% { transform: scale(1); opacity: 0.9; }
      100% { transform: scale(1.05); opacity: 1; }
    }