/*----------------------------------------------
 * 0. Global Reset & Base Styles
 *----------------------------------------------*/
 * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #fff;
    color: #333;
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/*----------------------------------------------
 * 1. Left Sidebar
 *----------------------------------------------*/
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 40px;
    height: 100%;
    background-color: #e0e0e0;
}

/*----------------------------------------------
 * 2. Header Section
 *----------------------------------------------*/
header {
    text-align: left;
    background-color: #f9f9f9;
    padding: 20px 50px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 32px;
    color: #333;
    font-family: 'Segoe UI', serif;
    margin-bottom: 5px;
}

header p {
    font-size: 14px;
    color: #666;
    font-family: 'Segoe UI', sans-serif;
    line-height: 1.4;
}

/*----------------------------------------------
 * 3. Navigation Bar
 *----------------------------------------------*/
.navbar {
    background-color: #fff;
    padding-left: 50px;
    padding-top: 10px;
    padding-bottom: 10px;
    border-bottom: 1px solid #e0e0e0;
    margin-top: 10px;
}

.navbar ul {
    list-style-type: none;
    display: flex;
    gap: 20px;
    padding: 10px 0;
}

.navbar ul li {
    margin-right: 15px;
}

.navbar ul li a {
    color: #333;
    font-size: 16px;
    text-decoration: none;
    font-weight: 400;
    transition: color 0.3s ease;
}

.navbar ul li a:hover,
.navbar ul li a:focus,
.navbar ul li a:active {
    color: #555;
}

/*----------------------------------------------
 * 4. Content Wrapper
 *----------------------------------------------*/
.content-wrapper {
    display: flex;
    flex-direction: column;
    margin: 20px auto;
    background-color: #fff;
    border-radius: 8px;
    text-align: left;
    margin-left: 70px;
    max-width: 900px;
    padding: 20px;
}

/*----------------------------------------------
 * 5. Resources Section
 *----------------------------------------------*/
.resources-section {
    margin: 20px 0;
}

.resources-section h2 {
    font-size: 24px;
    margin-bottom: 30px;
    font-weight: 700;
    text-align: center;
    color: #666;
}

.resource-category {
    margin-bottom: 30px;
}

.resource-category h3 {
    font-size: 20px;
    margin-bottom: 10px;
    font-weight: 600;
    color: #4d4d4f;
}

/*----------------------------------------------
 * 6. Resource Cards
 *----------------------------------------------*/
.resource-card {
    display: flex;
    flex-direction: column;
    padding: 20px;
    background-color: #f9f9f9;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.resource-card ul {
    list-style-type: none;
}

.resource-card ul li {
    margin-bottom: 8px;
}

.resource-card ul li a {
    color: #666;
    text-decoration: none;
    font-size: 16px;
    font-weight: 400;
    transition: color 0.3s ease;
}

.resource-card ul li a:hover {
    color: #444;
}

/*----------------------------------------------
 * 7. Divider
 *----------------------------------------------*/
hr {
    border: none;
    border-top: 1px dashed #ccc;
    margin: 20px 0;
}

/*----------------------------------------------
 * 8. Footer Section
 *----------------------------------------------*/
footer {
    position: relative;
    text-align: center;
    padding: 20px;
    background-color: #f5f5f5;
    color: #666;
    border-top: 1px solid #e0e0e0;
    margin-top: 50px;
}

/*----------------------------------------------
 * 9. Responsive Design
 *----------------------------------------------*/
@media (max-width: 768px) {
    .navbar ul {
        flex-direction: column;
        padding-left: 0;
    }

    .content-wrapper {
        margin-left: 20px;
        max-width: 100%;
    }

    .resource-card {
        padding: 15px;
    }

    .resource-category h3 {
        font-size: 18px;
    }

    .resource-card ul li a {
        font-size: 14px;
    }
}

/*----------------------------------------------
 * 10. Dark Mode Styles
 *----------------------------------------------*/
@media (prefers-color-scheme: dark) {
    body {
        background-color: #121212;
        color: #e0e0e0;
    }

    header {
        background-color: #1f1f1f;
        color: #e0e0e0;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    }

    header h1, header p {
        color: #e0e0e0;
    }

    .navbar {
        background-color: #1f1f1f;
        border-bottom: 1px solid #444;
    }

    .navbar ul li a {
        color: #e0e0e0;
    }

    .navbar ul li a:hover,
    .navbar ul li a:focus,
    .navbar ul li a:active {
        color: #fff;
    }

    .content-wrapper {
        background-color: #1e1e1e;
        color: #e0e0e0;
        box-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
    }

    .resources-section h2 {
        color: #e0e0e0;
    }

    .resource-category h3 {
        color: #f0f0f0;
    }

    .resource-card {
        background-color: #2c2c2c;
        border: 1px solid #444;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    }

    .resource-card ul li a {
        color: #e0e0e0;
    }

    .resource-card ul li a:hover {
        color: #fff;
    }

    hr {
        border-top: 1px dashed #444;
    }

    footer {
        background-color: #1f1f1f;
        color: #e0e0e0;
        border-top: 1px solid #444;
    }
}