@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&display=swap');
    * { margin: 0; padding: 0; box-sizing: border-box; }
    
    :root {
      --bg-primary: #e8f4fd;
      --bg-secondary: #f5fbff;
      --bg-card: #ffffff;
      --bg-code: #1a2a3a;
      --text-primary: #1a3a5a;
      --text-secondary: #5a8ab0;
      --text-code: #a8d8f0;
      --border-color: #d0e8f8;
      --shadow-color: rgba(59,158,255,0.1);
      --chip-bg: #f0f7ff;
      --chip-border: #c8e0f5;
      --turtle-bg: #e0f0ff;
      --step-bg: #f0f7ff;
      --dot-bg: #c8e0f5;
    }
    
    [data-theme="dark"] {
      --bg-primary: #0f1a2a;
      --bg-secondary: #152535;
      --bg-card: #1e2d3d;
      --bg-code: #0a1420;
      --text-primary: #e0f0ff;
      --text-secondary: #8ab0cc;
      --text-code: #a8d8f0;
      --border-color: #2a4055;
      --shadow-color: rgba(0,0,0,0.35);
      --chip-bg: #1a2a3a;
      --chip-border: #2a4055;
      --turtle-bg: #1a2a3a;
      --step-bg: #1a2a3a;
      --dot-bg: #2a4055;
    }
    
    body { 
      font-family: 'Nunito', sans-serif; 
      background: var(--bg-primary); 
      min-height: 100vh; 
      color: var(--text-primary); 
      overflow: hidden; 
      transition: background 0.3s, color 0.3s;
    }
    
    .app { 
      display: grid; 
      grid-template-columns: 340px 1fr 1fr; 
      height: 100vh; 
      gap: 0; 
      background: var(--bg-primary); 
    }

    /* ===== SOL PANEL ===== */
    .left-panel { 
      background: var(--bg-card); 
      border-right: 3px solid var(--border-color); 
      display: flex; 
      flex-direction: column; 
      box-shadow: 2px 0 16px var(--shadow-color); 
      overflow: hidden; 
    }
    
    .logo-wrapper { position: relative; }
    .logo { 
      padding: 16px 20px; 
      display: flex; 
      align-items: center; 
      gap: 14px; 
      border-bottom: 3px solid var(--border-color); 
      background: linear-gradient(135deg, #3b9eff 0%, #60c4ff 100%); 
      flex-shrink: 0; 
    }
    .logo-icon { 
      width: 48px; 
      height: 48px; 
      background: #fff; 
      border-radius: 16px; 
      display: flex; 
      align-items: center; 
      justify-content: center; 
      font-size: 1.5rem; 
      font-weight: 900; 
      color: #1a6ab0; 
      box-shadow: 0 4px 10px rgba(0,0,0,0.15); 
    }
    .logo-text { 
      font-weight: 900; 
      font-size: 1.35rem; 
      color: #ffffff; 
      letter-spacing: -0.5px; 
      text-shadow: 0 2px 4px rgba(0,0,0,0.15); 
    }
    .logo-text small { 
      font-weight: 600; 
      font-size: 0.75rem; 
      opacity: 0.9; 
      display: block; 
      letter-spacing: 0.3px; 
    }

    .theme-toggle { 
      position: absolute; 
      top: 14px; 
      right: 14px; 
      background: rgba(255,255,255,0.25); 
      border: 2px solid rgba(255,255,255,0.4); 
      color: #fff; 
      width: 42px; 
      height: 42px; 
      border-radius: 50%; 
      cursor: pointer; 
      font-size: 1.3rem; 
      display: flex; 
      align-items: center; 
      justify-content: center;
      transition: all 0.2s;
      z-index: 10;
    }
    .theme-toggle:hover { background: rgba(255,255,255,0.4); transform: scale(1.08); }

    .step-indicator { 
      display: flex; 
      gap: 6px; 
      padding: 12px 16px; 
      background: var(--step-bg); 
      border-bottom: 2px solid var(--border-color); 
      flex-shrink: 0; 
    }
    .step-dot { 
      flex: 1; 
      height: 10px; 
      border-radius: 8px; 
      background: var(--dot-bg); 
      transition: all 0.4s; 
    }
    .step-dot.active { 
      background: #3b9eff; 
      box-shadow: 0 0 12px rgba(59,158,255,0.5); 
      transform: scaleY(1.3);
    }
    .step-dot.done { background: #2ecc8a; }

    .cat-grid { 
      flex: 1; 
      overflow-y: auto; 
      padding: 14px 16px; 
      background: var(--bg-secondary); 
    }
    .cat-grid::-webkit-scrollbar { width: 6px; }
    .cat-grid::-webkit-scrollbar-thumb { background: #a0c8e8; border-radius: 6px; }

    .step-title { 
      font-size: 1.05rem; 
      font-weight: 800; 
      color: var(--text-primary); 
      padding: 4px 0 14px 0; 
      display: flex; 
      align-items: center; 
      gap: 10px; 
    }
    .step-title .emoji { font-size: 1.4rem; }

    .cat-card { 
      border-radius: 18px; 
      padding: 14px 16px; 
      background: var(--bg-card); 
      border: 3px solid var(--border-color); 
      box-shadow: 0 3px 10px var(--shadow-color); 
      margin-bottom: 12px; 
    }
    .cat-card .cat-header { 
      display: flex; 
      align-items: center; 
      gap: 10px; 
      font-weight: 800; 
      font-size: 0.95rem; 
      color: var(--text-primary); 
      margin-bottom: 10px; 
    }
    .cat-card .cat-dot { 
      width: 16px; 
      height: 16px; 
      border-radius: 50%; 
      flex-shrink: 0; 
      border: 2px solid rgba(0,0,0,0.06); 
    }

    .cat-blocks { display: flex; flex-direction: column; gap: 8px; }
    
    /* BÜYÜK KARTLAR - kolay tıklama */
    .block-chip { 
      background: var(--chip-bg); 
      border: 3px solid var(--chip-border); 
      border-radius: 14px; 
      padding: 14px 18px; 
      font-size: 1rem; 
      font-weight: 800; 
      color: var(--text-primary); 
      cursor: pointer; 
      transition: all 0.15s; 
      box-shadow: 0 2px 6px rgba(0,0,0,0.05); 
      width: 100%; 
      text-align: left;
      min-height: 52px;
      display: flex;
      align-items: center;
    }
    .block-chip:hover { 
      transform: scale(1.03); 
      background: var(--bg-card); 
      border-color: #3b9eff; 
      box-shadow: 0 4px 12px rgba(59,158,255,0.2); 
    }
    .block-chip:active { transform: scale(0.98); }
    .block-chip.selected { 
      background: #3b9eff; 
      color: #fff; 
      border-color: #3b9eff; 
      box-shadow: 0 4px 14px rgba(59,158,255,0.3); 
    }
    .block-chip.disabled { opacity: 0.35; cursor: not-allowed; pointer-events: none; }

    .step-actions { 
      display: flex; 
      flex-direction: column; 
      gap: 10px; 
      padding: 14px 0 8px 0; 
      border-top: 2px dashed var(--border-color); 
      margin-top: 10px; 
    }
    
    /* BÜYÜK ADIM BUTONLARI */
    .btn-step { 
      padding: 16px 24px; 
      border: none; 
      border-radius: 14px; 
      font-family: 'Nunito', sans-serif; 
      font-weight: 800; 
      font-size: 1.05rem; 
      cursor: pointer; 
      transition: all 0.15s; 
      text-align: center; 
      width: 100%; 
      min-height: 56px;
    }
    .btn-next { 
      background: linear-gradient(135deg, #2ecc8a, #1fba8a); 
      color: #fff; 
      box-shadow: 0 5px 0 #0e8a62; 
    }
    .btn-next:hover { filter: brightness(1.08); transform: translateY(-2px); }
    .btn-next:active { transform: translateY(2px); box-shadow: 0 2px 0 #0e8a62; }
    .btn-next:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
    .btn-reset-step { 
      background: #ffe8ea; 
      color: #c0304a; 
      border: 3px solid #ffc0c8; 
      min-height: 48px;
      font-size: 0.95rem;
    }
    .btn-reset-step:hover { background: #ffd0d4; }

    /* ===== ORTA PANEL ===== */
    .center-panel { 
      background: var(--bg-secondary); 
      border-right: 3px solid var(--border-color); 
      display: flex; 
      flex-direction: column; 
      padding: 16px 20px; 
      overflow: hidden; 
    }

    .turtle-area { 
      display: flex; 
      align-items: center; 
      gap: 14px; 
      background: var(--turtle-bg); 
      border-radius: 20px; 
      padding: 14px 18px; 
      margin-bottom: 14px; 
      flex-shrink: 0; 
      border: 3px solid var(--border-color); 
    }
    .turtle-avatar { 
      font-size: 3.2rem; 
      line-height: 1; 
      filter: drop-shadow(0 3px 6px rgba(0,0,0,0.1)); 
    }
    .turtle-speech { 
      font-weight: 700; 
      font-size: 1.05rem; 
      color: var(--text-primary); 
      background: var(--bg-card); 
      padding: 10px 16px; 
      border-radius: 14px; 
      flex: 1; 
      box-shadow: inset 0 1px 4px rgba(0,0,0,0.04); 
      line-height: 1.4;
    }
    .turtle-speech .highlight { color: #3b9eff; font-weight: 900; }

    .prompt-header { 
      display: flex; 
      align-items: center; 
      justify-content: space-between; 
      margin-bottom: 8px; 
      flex-shrink: 0; 
    }
    .prompt-header h2 { 
      font-size: 1rem; 
      font-weight: 800; 
      color: var(--text-primary); 
    }

    .selected-list { 
      display: flex; 
      flex-wrap: wrap; 
      gap: 8px; 
      margin-bottom: 12px; 
      min-height: 40px; 
      flex-shrink: 0; 
    }
    .selected-chip { 
      background: #3b9eff; 
      color: #fff; 
      padding: 8px 14px; 
      border-radius: 12px; 
      font-size: 0.9rem; 
      font-weight: 700; 
      display: inline-flex; 
      align-items: center; 
      gap: 8px; 
    }
    .selected-chip .remove { 
      cursor: pointer; 
      opacity: 0.8; 
      font-size: 1.1rem; 
      font-weight: 900;
      width: 22px;
      height: 22px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      background: rgba(255,255,255,0.2);
    }
    .selected-chip .remove:hover { opacity: 1; background: rgba(255,255,255,0.35); }
    .selected-chip .step-label { 
      font-size: 0.65rem; 
      opacity: 0.85; 
      background: rgba(255,255,255,0.25); 
      padding: 2px 8px; 
      border-radius: 6px; 
    }

    .code-area { 
      flex: 1; 
      background: var(--bg-code); 
      border-radius: 16px; 
      padding: 16px 20px; 
      overflow-y: auto; 
      min-height: 100px; 
      margin-top: 6px; 
      font-family: 'Courier New', monospace; 
      font-size: 0.95rem; 
      color: var(--text-code); 
      line-height: 1.85; 
      white-space: pre-wrap; 
      flex-shrink: 0; 
      max-height: 200px; 
    }
    .code-area .comment { color: #5a8a6a; }
    .code-area .keyword { color: #ff7eb3; }
    .code-area .string { color: #34d9a5; }
    .code-area .number { color: #f97316; }
    .code-area .method { color: #60c4ff; }
    .code-area .class { color: #fbbf24; }
    .code-area .empty { color: #4a6a7a; font-style: italic; font-size: 0.95rem; }
    .code-area.loading { opacity: 0.45; }

    .actions { 
      display: flex; 
      flex-direction: column; 
      gap: 10px; 
      margin-top: 12px; 
      flex-shrink: 0; 
    }
    
    /* BÜYÜK ANA BUTONLAR */
    .btn { 
      padding: 16px 18px; 
      border: none; 
      border-radius: 14px; 
      font-family: 'Nunito', sans-serif; 
      font-weight: 800; 
      font-size: 1.1rem; 
      cursor: pointer; 
      transition: all 0.15s; 
      display: flex; 
      align-items: center; 
      justify-content: center; 
      gap: 12px; 
      width: 100%; 
      position: relative; 
      min-height: 58px;
    }
    .btn-generate { 
      background: linear-gradient(135deg, #f97316, #fbbf24); 
      color: #fff; 
      box-shadow: 0 5px 0 #c97d0a; 
    }
    .btn-generate:hover { filter: brightness(1.08); transform: translateY(-2px); }
    .btn-generate:active { transform: translateY(2px); box-shadow: 0 2px 0 #c97d0a; }
    .btn-generate:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
    
    .btn-run { 
      background: linear-gradient(135deg, #3b9eff, #60c4ff); 
      color: #fff; 
      box-shadow: 0 5px 0 #1a6ab0; 
    }
    .btn-run:hover { filter: brightness(1.08); transform: translateY(-2px); }
    .btn-run:active { transform: translateY(2px); box-shadow: 0 2px 0 #1a6ab0; }
    .btn-run:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
    
    .btn-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
    }
    .btn-clear { 
      background: #ffe8ea; 
      color: #c0304a; 
      border: 3px solid #ffc0c8; 
      min-height: 50px;
      font-size: 1rem;
    }
    .btn-clear:hover { background: #ffd0d4; }
    .btn-random { 
      background: #e8f0ff; 
      color: #3a5ad0; 
      border: 3px solid #c0d0f8; 
      min-height: 50px;
      font-size: 1rem;
    }
    .btn-random:hover { background: #d4e2ff; }

    .spinner { 
      display: none; 
      width: 22px; 
      height: 22px; 
      border: 3px solid rgba(255,255,255,0.3); 
      border-top: 3px solid #fff; 
      border-radius: 50%; 
      animation: spin 0.8s linear infinite; 
      flex-shrink: 0; 
    }
    .spinner.active { display: inline-block; }
    @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

    .quality-bar { 
      display: flex; 
      align-items: center; 
      gap: 8px; 
      padding: 8px 0; 
      border-top: 2px solid var(--border-color); 
      margin-top: 10px; 
      flex-shrink: 0; 
      flex-wrap: wrap; 
    }
    .quality-label { 
      font-size: 0.75rem; 
      font-weight: 700; 
      color: var(--text-secondary); 
      text-transform: uppercase; 
      letter-spacing: 0.4px; 
    }
    .quality-stars { font-size: 1.1rem; letter-spacing: 2px; }
    .quality-tip { 
      font-size: 0.8rem; 
      color: var(--text-secondary); 
      font-weight: 600; 
    }

    .history-bar { 
      display: flex; 
      align-items: center; 
      gap: 8px; 
      overflow-x: auto; 
      padding: 6px 0; 
      min-height: 32px; 
      border-top: 2px solid var(--border-color); 
      margin-top: 6px; 
      flex-shrink: 0; 
    }
    .history-bar::-webkit-scrollbar { height: 4px; }
    .history-bar::-webkit-scrollbar-thumb { background: #a0c8e8; border-radius: 4px; }
    .history-label { 
      font-size: 0.7rem; 
      font-weight: 700; 
      color: var(--text-secondary); 
      text-transform: uppercase; 
      letter-spacing: 0.3px; 
      white-space: nowrap; 
      flex-shrink: 0; 
    }
    .history-chip { 
      background: #deeeff; 
      border: 2px solid #a8ccee; 
      color: #1a5a8a; 
      border-radius: 8px; 
      padding: 4px 12px; 
      font-size: 0.75rem; 
      font-weight: 700; 
      cursor: pointer; 
      white-space: nowrap; 
      flex-shrink: 0; 
    }
    .history-chip:hover { background: #c4e0ff; border-color: #3b9eff; }
    .history-empty { 
      font-size: 0.8rem; 
      color: var(--text-secondary); 
      font-style: italic; 
    }

    /* ===== SAĞ PANEL ===== */
    .scene-wrap { 
      position: relative; 
      background: var(--bg-primary); 
      overflow: hidden; 
    }
    #c { width: 100%; height: 100%; display: block; cursor: grab; }
    #c:active { cursor: grabbing; }
    .status { 
      position: absolute; 
      top: 14px; 
      left: 14px; 
      background: rgba(255,255,255,0.94); 
      border: 3px solid var(--border-color); 
      color: var(--text-primary); 
      padding: 8px 14px; 
      border-radius: 12px; 
      font-size: 0.8rem; 
      font-weight: 700; 
      pointer-events: none; 
      max-width: 55%; 
      box-shadow: 0 3px 10px rgba(59,158,255,0.15); 
    }
    .controls-hint { 
      position: absolute; 
      bottom: 14px; 
      left: 50%; 
      transform: translateX(-50%); 
      background: rgba(255,255,255,0.92); 
      border: 3px solid var(--border-color); 
      color: var(--text-secondary); 
      padding: 8px 16px; 
      border-radius: 12px; 
      font-size: 0.75rem; 
      font-weight: 600; 
      text-align: center; 
      pointer-events: none; 
      white-space: nowrap; 
    }
    .challenge-badge { 
      position: absolute; 
      top: 14px; 
      right: 14px; 
      background: linear-gradient(135deg, #f97316, #fbbf24); 
      color: #fff; 
      padding: 8px 18px; 
      border-radius: 12px; 
      font-size: 0.9rem; 
      font-weight: 800; 
      box-shadow: 0 4px 14px rgba(249,115,22,0.4); 
      display: none; 
    }
    .challenge-badge.show { display: block; }

    .toast { 
      position: fixed; 
      bottom: 30px; 
      right: 30px; 
      background: #1a8a5a; 
      color: #fff; 
      padding: 14px 22px; 
      border-radius: 14px; 
      font-size: 1rem; 
      font-weight: 700; 
      box-shadow: 0 6px 20px rgba(0,0,0,0.25); 
      opacity: 0; 
      transform: translateY(12px); 
      transition: all 0.25s; 
      pointer-events: none; 
      z-index: 999; 
    }
    .toast.show { opacity: 1; transform: translateY(0); }

    @media (max-width: 1100px) {
      .app { 
        grid-template-columns: 1fr; 
        grid-template-rows: auto auto 1fr; 
        height: auto; 
        min-height: 100vh; 
        overflow-y: auto; 
      }
      .left-panel { max-height: 340px; }
      .center-panel { max-height: 480px; }
      .scene-wrap { min-height: 380px; }
      .block-chip { padding: 16px 18px; font-size: 1.05rem; min-height: 56px; }
      .btn { min-height: 60px; font-size: 1.15rem; }
    }