:root {
        --bg: #ffffff;
        --text: #222;
        --card: #ffffff;
        --border: #e4e4e4;
        --header: #ffffff;
        --sidebar: #fafafa;
      }

      body.dark {
        --bg: #181818;
        --text: #f2f2f2;
        --card: #252525;
        --border: #3d3d3d;
        --header: #222;
        --sidebar: #202020;
      }

      body {
        background: var(--bg);
        color: var(--text);
        transition: .25s;
      }

      .navbar {
        background: var(--header) !important;
        border-bottom: 1px solid var(--border);
      }

      .sidebar {
        background: var(--sidebar);
        border-left: 1px solid var(--border);
        padding: 25px;
        position: sticky;
        top: 70px;
      }

      .sidebar h5 {
        font-size: 0.95rem;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.8px;
        color: var(--text);
        margin-top: 25px;
        margin-bottom: 12px;
        padding-bottom: 8px;
        border-bottom: 2px solid var(--border);
        position: relative;
        opacity: 0.9;
      }

      .sidebar h5::after {
        content: '';
        position: absolute;
        bottom: -2px;
        left: 0;
        width: 35px;
        height: 2px;
        background-color: #0d6efd;
      }

      .sidebar h5:first-of-type {
        margin-top: 0;
      }

      .sidebar a {
        display: flex;
        justify-content: space-between;
        align-items: center;
        color: var(--text);
        text-decoration: none;
        padding: 8px 12px;
        margin: 2px -12px;
        border-radius: 6px;
        position: relative;
        transition: all 0.2s ease;
      }

      .sidebar a::before {
        content: '';
        position: absolute;
        left: 0;
        top: 50%;
        transform: translateY(-50%) scaleY(0.3);
        width: 3px;
        height: 16px;
        background-color: #0d6efd;
        border-radius: 0 4px 4px 0;
        opacity: 0;
        transition: all 0.2s ease;
      }

      .sidebar a:hover,
      .sidebar a.active {
        color: #0d6efd;
        background: rgba(13, 110, 253, 0.06);
        padding-left: 18px;
      }

      .sidebar a:hover::before {
        opacity: 1;
        transform: translateY(-50%) scaleY(1);
      }

      .card-app {
        background: var(--card);
        border: 1px solid var(--border);
        transition: .2s;
      }

      .card-app:hover {
        transform: translateY(-3px);
        box-shadow: 0 10px 20px rgba(0, 0, 0, .08);
      }

      .card-app img {
        border-radius: 10px;
        width: 72px;
        height: 72px;
        object-fit: cover;
      }

      .section-title {
        margin: 35px 0 20px;
        font-weight: 600;
      }

      footer {
        border-top: 1px solid var(--border);
        margin-top: 50px;
        padding: 30px;
        color: #888;
      }

      footer a {
        color: var(--text) !important;
        opacity: 0.75;
        transition: opacity 0.2s ease, color 0.2s ease;
      }

      footer a:hover {
        opacity: 1;
        color: #0d6efd !important;
      }

      .search-form {
        max-width: 280px;
        width: 100%;
      }

      @media (max-width: 991.98px) {
        .search-form {
          max-width: 100%;
          margin: 10px 0;
        }
      }

      .search-form .form-control {
        background: var(--card);
        color: var(--text);
        border-color: var(--border);
      }

      .search-form .form-control:focus {
        background: var(--card);
        color: var(--text);
        border-color: #0d6efd;
        box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
      }

      .search-form .form-control::placeholder {
        color: var(--text);
        opacity: 0.65;
      }