:root {
    --background-dark-100: #000000;
    --background-dark-80: #333333;
    --background-blue-cyan: #0D8FFB;
    --color-white-100: #ffffff;
    --color-white-90: #eeeeee;

    --font-size-48: 48px;
    --font-size-30: 30px;
    --font-size-18: 18px;

    --transition-default: 0.25s ease;
}

/* Reset and default */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-family: "Poppins", sans-serif;
    color: var(--color-white-100);
}

body {
    background: var(--background-dark-100);
    display: flex;
}

.sidebar {
    width: 200px;
    background: var(--background-dark-80);
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    border-right: 2px solid var(--background-blue-cyan);
}

.sidebar .back-btn {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    background: var(--background-blue-cyan);
    color: var(--color-white-100);
    text-decoration: none;
    border-radius: 8px;
    text-align: center;
    transition: background 0.3s ease, transform 0.3s ease;
    width: 100%;
    margin-top: 10px;
}

.sidebar .back-btn:hover {
    background: var(--color-white-100);
    color: var(--background-dark-100);
    transform: scale(1.05);
}

.portfolio {
    flex: 1;
    padding: 20px;
}

.section-heading {
    font-size: var(--font-size-30);
    margin-bottom: 20px;
    text-align: center;
    font-weight: 600;
}

.content-block {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 40px;
}

.content-block.reverse {
    flex-direction: row-reverse;
}

.content-text {
    flex: 1;
}

.content-image {
    flex: 1;
    max-width: 400px;
    border-radius: 10px;
}

.section-subheading {
    font-size: var(--font-size-18);
    margin-bottom: 10px;
    font-weight: 500;
}

.portfolio p, .portfolio ul {
    margin: 0 0 20px 0;
    line-height: 1.6;
}

.portfolio ul {
    list-style-type: disc;
    padding-left: 20px;
}

/* Image Gallery */

.image-gallery {
    text-align: center;
    margin-bottom: 40px;
}

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    padding: 20px;
}

.image-grid img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

.image-grid img:hover {
    transform: scale(1.05);
}

/* Video Section */
.video-section {
    text-align: center;
    margin: 40px 0;
}

.video-section video {
    width: 80%;
    max-width: 800px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}