:root {
      --bg-image: url('https://raw.githubusercontent.com/JSXAGI/korean-study/main/korean.jpeg');
      --bg-color: #fef3c7;
      --surface-color: rgba(255, 255, 255, 0.8);
      --text-color: #1e293b;
      --primary-color: #f59e0b;
      --secondary-color: #8b5cf6;
      --accent-color: #10b981;
      --header-height: 100px;
    }  
    * { box-sizing: border-box; font-family: 'Segoe UI', Meiryo, sans-serif; }
    body, html { 
      margin: 0; padding: 0; min-height: 100vh;
      background-color: var(--bg-color); background-image: var(--bg-image);
      background-size: cover; background-position: left 20% center !important;
      background-attachment: fixed; background-repeat: no-repeat;
      color: var(--text-color);
    }

    /* 原本のヘッダーデザイン */
    .app-header {
      position: fixed; top: 0; left: 0; right: 0; height: var(--header-height);
      background-color: transparent; display: flex; align-items: center; z-index: 1000;
    }
    .home-link {
      position: absolute; left: 20px; top: 15px;
      background: white; color: var(--primary-color); padding: 5px; border-radius: 5px;
      font-weight: bold; font-size: 2rem; border: none; cursor: pointer; box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    }
    .app-title {
      flex-grow: 1; text-align: center; color: #EF4123; text-shadow: 2px 2px 0px #fff;
      font-weight: bold; font-size: 2.2rem; margin: 0;
    }

    /* メインコンテンツの余白調整（重なり防止） */
    .main-content {
      padding-top: calc(var(--header-height) + 20px);
      padding-left: 20px; padding-right: 20px; padding-bottom: 40px;
      max-width: 800px; margin: auto;
    }

    .card {
      background: var(--surface-color); border-radius: 20px; padding: 25px;
      box-shadow: 0 10px 25px rgba(0,0,0,0.1); border: 4px solid #fff; margin-bottom: 20px;
    }
    
    .btn {
      cursor: pointer; border: none; border-radius: 12px; padding: 12px;
      font-weight: bold; font-size: 1.1rem; display: inline-flex; align-items: center;
      justify-content: center; transition: 0.2s;
    }
    .btn-primary { background-color: var(--primary-color); color: white; width: 100%; }
    
    /* 原本のレベルセレクター */
    .level-selector { display: flex; justify-content: center; gap: 5px; margin-bottom: 15px; }
    .btn-lvl { flex: 1; padding: 8px; border-radius: 8px; border: 1px solid #cbd5e1; background: white; font-size: 0.9rem; }
    .btn-lvl.active { background: var(--primary-color); color: white; border-color: var(--primary-color); }

    .lang-row { background: #f8fafc; padding: 12px 15px; border-radius: 15px; margin-bottom: 10px; border: 1px solid #e2e8f0; }
    .lang-label { font-size: 0.75rem; color: #64748b; font-weight: bold; }
    .lang-text { font-size: 1.6rem; font-weight: bold; display: flex; justify-content: space-between; align-items: center; }

    .btn-speak { background: #e2e8f0; border: none; padding: 10px 15px; border-radius: 8px; cursor: pointer; font-size: 1.4rem; }
    .hidden { display: none; }
    .text-center { text-align: center; }
    .badge { padding: 5px 15px; border-radius: 20px; font-size: 0.9rem; background: var(--secondary-color); color: white; margin: 2px; display: inline-block; }

    /* クエスト画面用 */
    .quest-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 20px; }
	
	/* 基本（スマホ用）：11pxなら一行に収まりやすい */
.level-badge-text {
  font-size: 11px;
}

/* 画面の横幅が600px以上の時（PC用） */
@media (min-width: 600px) {
  .level-badge-text {
    font-size: 16px;
  }
}