:root {
      --bg: #121212;
      --card: #1e1e1e;
      --text: #e0e0e0;
      --muted: #a0a0a0;
      --accent: #007bff; 
      --yellow: #ffc107;
      --purple: #007bff;
      --input-bg: #2c2c2c;
      --border: #383838;
      --shadow: rgba(0, 0, 0, 0.4);
      --border-radius: 12px;
      --transition-duration: 0.2s;
    }

    /* Light Mode */
    body[data-theme='light'] {
      --bg: #ffffff;
      --card: #f9f9f9;
      --text: #000000;
      --muted: #555555;
      --accent: #007bff;
      --yellow: #ffc107;
      --purple: #007bff;
      --input-bg: #ffffff;
      --border: #cccccc;
      --shadow: rgba(0, 0, 0, 0.1);
    }

    * { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: 'Segoe UI', Arial, sans-serif;
      background: var(--bg);
      color: var(--text);
      min-height: 100vh;
      display: flex;
      justify-content: center;
      align-items: flex-start;
      padding: 30px 18px;
    }

    .settings-container {
      width: 100%;
      max-width: 800px;
      background: var(--card);
      border-radius: var(--border-radius);
      padding: 24px;
      box-shadow: 0 10px 40px var(--shadow);
      position: relative;
    }

    .settings-container h1 {
      text-align: center;
      color: var(--accent);
      margin: 0 0 16px;
      font-size: 2.2rem;
      font-weight: 900;
      letter-spacing: 1px;
    }

    .settings-container .go-back {
      position: absolute;
      top: 24px;
      left: 24px;
      font-size: 2rem;
      color: var(--muted);
      text-decoration: none;
      transition: color var(--transition-duration);
      line-height: 1;
    }
    .settings-container .go-back:hover { color: var(--text); }

    .settings-section {
      margin-bottom: 30px;
      padding: 20px;
      border: 1px solid var(--border);
      border-radius: var(--border-radius);
      background: linear-gradient(45deg, rgba(255, 255, 255, 0.02), rgba(0, 0, 0, 0.05));
    }
    body[data-theme='light'] .settings-section { background: #f8f9fa; }

    .settings-section h2 {
      margin-top: 0;
      color: var(--yellow);
      font-size: 1.5rem;
      border-bottom: 2px solid var(--accent);
      padding-bottom: 8px;
      margin-bottom: 16px;
    }

    .setting-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 12px 0;
      border-bottom: 1px dashed var(--border);
    }
    .setting-item:last-child { border-bottom: none; }
    .setting-item label { font-weight: 700; font-size: 1.1rem; color: var(--text); }
    .setting-item p { margin: 0; font-size: 0.9rem; color: var(--muted); line-height: 1.4; }
    .setting-item .controls { display: flex; align-items: center; gap: 12px; }

    .input-text, .input-select {
      width: 250px; padding: 10px; border-radius: 8px; border: 1px solid var(--border);
      background-color: var(--input-bg); color: var(--text); font-family: inherit;
      font-size: 1rem; transition: border-color var(--transition-duration);
    }
    .input-text:focus, .input-select:focus { outline: none; border-color: var(--accent); }

    .toggle-switch { position: relative; display: inline-block; width: 50px; height: 28px; }
    .toggle-switch input { opacity: 0; width: 0; height: 0; }
    .slider {
      position: absolute; cursor: pointer; top: 0; right: 0; bottom: 0; left: 0;
      background-color: var(--muted); transition: var(--transition-duration); border-radius: 28px;
    }
    .slider:before {
      position: absolute; content: ""; height: 20px; width: 20px; left: 4px; bottom: 4px;
      background-color: #fff; transition: var(--transition-duration); border-radius: 50%;
    }
    input:checked + .slider { background-color: var(--accent); }
    input:focus + .slider { box-shadow: 0 0 1px var(--accent); }
    input:checked + .slider:before { transform: translateX(22px); }

    .btn {
      padding: 12px 24px; border: none; border-radius: 8px; font-weight: 700; cursor: pointer;
      transition: transform var(--transition-duration), opacity var(--transition-duration);
      font-size: 1rem; font-family: inherit;
    }
    .btn-save {
      background-color: var(--accent); color: white;
      box-shadow: 0 4px 15px rgba(0, 123, 255, 0.4);
    }
    .btn-save:hover { transform: translateY(-2px); opacity: 0.9; }

    .btn-reset {
      background-color: var(--yellow); color: #333;
      box-shadow: 0 4px 15px rgba(250, 202, 21, 0.4);
    }
    .btn-reset:hover { transform: translateY(-2px); opacity: 0.9; }
    
    .btn-add-model, .btn-tools, .btn-search { background-color: var(--yellow); color: #333; }

    /* Star Rating */
    .rating-container {
      display: flex;
      justify-content: flex-start;
      font-size: 2rem;
    }
    .rating-container input[type="radio"] { display: none; }
    .rating-container label.star {
      color: var(--muted);
      cursor: pointer;
      padding: 0 4px;
      transition: color var(--transition-duration);
    }
    .rating-container label.star:hover,
    .rating-container label.star:hover ~ label.star { color: var(--yellow); }
    .rating-container input[type="radio"]:checked ~ label.star { color: var(--yellow); }

    @media (max-width: 600px) {
      body { padding: 15px; }
      .settings-container { padding: 16px; }
      .settings-container .go-back { top: 16px; left: 16px; }
      .setting-item { flex-direction: column; align-items: flex-start; gap: 8px; }
      .setting-item .controls { width: 100%; justify-content: flex-start; }
      .input-text, .input-select { width: 100%; }
    }