:root {
        --primary-color: #264de4;
        --secondary-color: #2965f1;
        --text-color: #333;
        --bg-color: #f8f9fa;
        --card-bg: #fff;
        --sidebar-bg: #fff;
        --border-color: #e0e0e0;
        --code-bg: #f5f5f5;
        --code-color: #0c4b8c;
        --btn-hover: #1a3aa8;
        --answer-bg: #fef9e7;
        --shadow: 0 4px 12px rgba(0, 0, 0, 00.5);
        --header-bg: linear-gradient(135deg, #264de4 0%, #0c4b8c 100%);
        --header-text: #fff;
         }

      [data-theme="dark"] {
        --primary-color: #264de4;
        --secondary-color: #2965f1;
        --text-color: #e0e0e0;
        --bg-color: #121212;
        --card-bg: #1e1e1e;
        --sidebar-bg: #1a1a1a;
        --border-color: #333;
        --code-bg: #2d2d2d;
        --code-color: #5a8de1;
        --btn-hover: #5a8de1;
        --answer-bg: #2c1810;
        --shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        --header-bg: linear-gradient(135deg, #1a3aa8 0%, #0c2e5c 100%);
        --header-text: #fff;
      }

      * {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
      }

      body {
        font-family: "Inter", sans-serif;
        line-height: 1.6;
        color: var(--text-color);
        background-color: var(--bg-color);
        transition: background-color 0.3s, color 0.3s;
      }

      .progress-bar {
        height: 6px;
         background-color: rgba(255, 255, 255, 0.3);
        border-radius: 3px;
        overflow: hidden;
        margin-bottom: 8px;
        width: 0%;
        transition: width 0.3s ease;
      }

      .app-container {
        display: flex;
        min-height: 100vh;
      }

      .sidebar {
        width: clamp(250px, 25%, 330px);
        background-color: var(--sidebar-bg);
        border-right: 1px solid var(--border-color);
        display: flex;
        flex-direction: column;
        transition: all 0.3s;
        position: fixed;
        height: 100vh;
        overflow-y: auto;
      }

      .sidebar-header {
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        display: flex;
        justify-content: space-between;
        align-items: center;
      }

      .sidebar-header h2 {
        color: var(--primary-color);
        font-weight: 600;
      }

      .filter-section {
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
      }

      .filter-section h3 {
        margin-bottom: 15px;
        font-size: 16px;
        font-weight: 600;
      }

      .filter-options {
        display: flex;
        flex-direction: column;
        gap: 12px;
      }

      .filter-option {
        display: flex;
        align-items: center;
        position: relative;
        padding-left: 30px;
        cursor: pointer;
        font-size: 14px;
      }

      .filter-option input {
        position: absolute;
        opacity: 0;
        cursor: pointer;
        height: 0;
        width: 0;
      }

      .checkmark {
        position: absolute;
        top: 0;
        left: 0;
        height: 18px;
        width: 18px;
        background-color: var(--card-bg);
        border: 1px solid var(--border-color);
        border-radius: 3px;
      }

      .filter-option:hover input ~ .checkmark {
        background-color: var(--code-bg);
      }

      .filter-option input:checked ~ .checkmark {
        background-color: var(--primary-color);
        border-color: var(--primary-color);
      }

      .checkmark:after {
        content: "";
        position: absolute;
        display: none;
      }

      .filter-option input:checked ~ .checkmark:after {
        display: block;
      }

      .filter-option .checkmark:after {
        left: 6px;
        top: 2px;
        width: 4px;
        height: 9px;
        border: solid white;
        border-width: 0 2px 2px 0;
        transform: rotate(45deg);
      }

      .program-list-container {
        padding: 20px;
        flex-grow: 1;
        overflow-y: auto;
      }

      .program-list-container h3 {
        margin-bottom: 15px;
        font-size: 16px;
        font-weight: 600;
      }

      .program-list {
        display: flex;
        flex-direction: column;
        gap: 8px;
        max-height: calc(100vh - 300px);
        overflow-y: auto;
      }

      .program-item {
        padding: 12px 15px;
        border-radius: 6px;
        background-color: var(--card-bg);
        border: 1px solid var(--border-color);
        cursor: pointer;
        transition: all 0.2s;
        font-size: 14px;
      }

      .program-item:hover {
        background-color: var(--code-bg);
        transform: translateY(-2px);
      }

      .program-item.active {
        background-color: var(--primary-color);
        color: white;
        border-color: var(--primary-color);
        box-shadow: var(--shadow);
      }

      .main-content {
        flex-grow: 1;
        margin-left: 300px;
        display: flex;
        flex-direction: column;
        min-height: 100vh;
      }

      .main-header {
        background: var(--header-bg);
        color: var(--header-text);
        padding: 30px;
        text-align: center;
      }

      .main-header h1 {
        font-size: 28px;
        font-weight: 700;
        margin-bottom: 10px;
      }

      .subtitle {
        font-size: 16px;
        opacity: 0.9;
        margin-bottom: 20px;
      }

      .progress-container {
        max-width: 500px;
        margin: 0 auto;
        border-radius: 10px;
        padding: 2px;
      }

      .progress-text {
        font-size: 14px;
        text-align: right;
        color: rgba(255, 255, 255, 0.9);
        margin-top: 5px;
      }

      .program-container {
        flex-grow: 1;
        padding: 30px;
        max-width: 1000px;
        margin: 0 auto;
        width: 100%;
      }

      .program-card {
        background-color: var(--card-bg);
        border-radius: 10px;
        box-shadow: var(--shadow);
        padding: 30px;
        margin-bottom: 25px;
        min-height: 400px;
        transition: all 0.3s;
      }

      .program-number {
        display: inline-block;
        background-color: var(--primary-color);
        color: white;
        font-size: 14px;
        font-weight: 500;
        padding: 4px 12px;
        border-radius: 20px;
        margin-bottom: 15px;
      }

      .program-title {
        font-size: 22px;
        margin-bottom: 25px;
        font-weight: 600;
        line-height: 1.4;
      }

      .code-block {
        background-color: var(--code-bg);
        padding: 20px;
        border-radius: 8px;
        margin: 20px 0;
        overflow-x: auto;
        font-family: "Courier New", Courier, monospace;
        border-left: 4px solid var(--primary-color);
        position: relative;
      }

      .code-block code {
        color: var(--code-color);
        font-size: 14px;
        line-height: 1.5;
        display: block;
        white-space: pre;
      }

      .copy-btn {
        position: absolute;
        top: 10px;
        right: 10px;
        background: var(--primary-color);
        color: white;
        border: none;
        padding: 5px 10px;
        border-radius: 4px;
        cursor: pointer;
        font-size: 12px;
        opacity: 0.8;
        transition: opacity 0.2s;
      }

      .copy-btn:hover {
        opacity: 1;
      }

      .keyword {
        color: var(--primary-color);
        font-weight: bold;
      }

      .string {
        color: #22863a;
      }

      .comment {
        color: #6a737d;
        font-style: italic;
      }

      .number {
        color: #005cc5;
      }

      .output-container {
        background-color: var(--answer-bg);
        border-left: 4px solid var(--primary-color);
        padding: 20px;
        margin-top: 25px;
        border-radius: 8px;
        display: none;
        transition: all 0.3s;
      }

      .output-container h3 {
        font-size: 18px;
        margin-bottom: 15px;
        color: var(--primary-color);
      }

      .output-container.visible {
        display: block;
        animation: fadeIn 0.5s;
      }

      @keyframes fadeIn {
        from {
          opacity: 0;
          transform: translateY(10px);
        }
        to {
          opacity: 1;
          transform: translateY(0);
        }
      }

      .controls {
        display: flex;
        justify-content: space-between;
        gap: 15px;
      }

      .btn {
        padding: 12px 20px;
        border: none;
        border-radius: 6px;
        background-color: var(--card-bg);
        color: var(--text-color);
        cursor: pointer;
        font-size: 15px;
        font-weight: 500;
        border: 1px solid var(--border-color);
        transition: all 0.2s;
        display: flex;
        align-items: center;
        gap: 8px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
      }

      .btn:hover {
        background-color: var(--code-bg);
        transform: translateY(-2px);
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
      }

      .btn.primary {
        background-color: var(--primary-color);
        color: white;
        border: 1px solid var(--primary-color);
      }

      .btn.primary:hover {
        background-color: var(--btn-hover);
      }

      .btn:disabled {
        opacity: 0.5;
        cursor: not-allowed;
        transform: none;
        box-shadow: none;
      }

      footer {
        text-align: center;
        padding: 20px;
        border-top: 1px solid var(--border-color);
        font-size: 14px;
        color: var(--text-color);
        opacity: 0.7;
      }

      .gowthamraj {
        font-family: "Work Sans", sans-serif;
        font-weight: 600;
        color: #2b2b2c;
      }

      .theme-toggle {
        display: flex;
        align-items: center;
        gap: 8px;
      }

      .switch {
        position: relative;
        display: inline-block;
        width: 40px;
        height: 20px;
      }

      .switch input {
        opacity: 0;
        width: 0;
        height: 0;
      }

      .slider {
        position: absolute;
        cursor: pointer;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: var(--border-color);
        transition: .4s;
        border-radius: 20px;
      }

      .slider:before {
        position: absolute;
        content: "";
        height: 16px;
        width: 16px;
        left: 2px;
        bottom: 2px;
        background-color: white;
        transition: .4s;
        border-radius: 50%;
      }

      input:checked + .slider {
        background-color: var(--primary-color);
      }

      input:checked + .slider:before {
        transform: translateX(20px);
      }

      .no-programs {
        text-align: center;
        padding: 40px;
        color: var(--text-color);
        opacity: 0.7;
      }

      .run-btn {
        background-color: #28a745;
        color: white;
        border: none;
        padding: 8px 16px;
        border-radius: 4px;
        cursor: pointer;
        font-size: 14px;
        margin-top: 10px;
        transition: background-color 0.2s;
      }

      .run-btn:hover {
        background-color: #218838;
      }

      @media (max-width: 992px) {
        .app-container {
          flex-direction: column;
        }

        .sidebar {
          width: 100%;
          height: auto;
          position: relative;
          border-right: none;
          border-bottom: 1px solid var(--border-color);
        }

        .main-content {
          margin-left: 0;
        }

        .program-list {
          max-height: 300px;
        }
      }

      @media (max-width: 768px) {
        .controls {
          flex-wrap: wrap;
        }

        .btn {
          flex: 1;
          min-width: 120px;
          justify-content: center;
        }

        .program-card {
          padding: 20px;
        }

        .main-header {
          padding: 20px;
        }

        .program-container {
          padding: 20px;
        }
      }

      @media (max-width: 480px) {
        .main-header h1 {
          font-size: 24px;
        }

        .program-title {
          font-size: 18px;
        }

        .btn {
          padding: 10px 15px;
          font-size: 14px;
        }

        .program-number {
          font-size: 12px;
        }
      }

      ::-webkit-scrollbar {
        width: 6px;
      }

      ::-webkit-scrollbar-track {
        background: #f1f1f1;
      }

      ::-webkit-scrollbar-thumb {
        background: #888;
        border-radius: 10px;
      }

      ::-webkit-scrollbar-thumb:hover {
        background: #555;
      }

      * {
        scrollbar-width: thin;
        scrollbar-color: #888 #f1f1f1;
      }