:root {
    --bg-color: #0D1117;
    --card-bg: #161B22;
    --text-color: #C9D1D9;
    --highlight-color: #58A6FF;
    --secondary-color: #8B949E;
    --button-bg: #21262D;
    --button-hover: #30363D;
    --button-active: #58A6FF;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

@keyframes slideIn {
    from { transform: translateX(-50px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

body {
    font-family: 'Fira Code', monospace;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    width: 100%;
    margin: 50px 20px;
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 40px;
    animation: fadeIn 1s ease-out;
}

.sidebar {
    position: sticky;
    top: 50px;
    height: fit-content;
    padding: 30px;
    background-color: var(--card-bg);
    border-left: 2px solid var(--highlight-color);
    animation: slideIn 1s ease-out;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#profile-image {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--highlight-color);
    transition: transform 0.3s ease;
}

#profile-image:hover {
    transform: scale(1.1);
}

#name {
    font-size: 28px;
    margin: 20px 0 10px;
    color: var(--highlight-color);
}

#job-title, #location {
    color: var(--secondary-color);
    font-size: 14px;
    margin: 5px 0;
}

.nav-buttons {
    display: flex;
    flex-direction: column;
    width: 100%;
    margin-top: 20px;
}

.nav-button {
    background-color: var(--button-bg);
    color: var(--text-color);
    border: none;
    padding: 10px 15px;
    margin: 5px 0;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
    font-family: 'Fira Code', monospace;
    font-size: 14px;
    text-align: left;
}

.nav-button:hover {
    background-color: var(--button-hover);
}

.nav-button.active {
    background-color: var(--button-active);
    color: var(--bg-color);
}

.main-content {
    display: flex;
    flex-direction: column;
    gap: 50px;
    width: 100%;
}

#portfolio-subcategories {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
}

.subcategory-button {
    background-color: var(--button-bg);
    color: var(--text-color);
    border: none;
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease;
    font-family: 'Fira Code', monospace;
    font-size: 12px;
}

.subcategory-button:hover {
    background-color: var(--button-hover);
}

.subcategory-button.active {
    background-color: var(--button-active);
    color: var(--bg-color);
}

.hidden {
    display: none !important;
}

.section {
    background-color: var(--card-bg);
    padding: 30px;
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeIn 1s ease-out;
    animation-fill-mode: both;
    width: 100%;
}

.section:nth-child(1) { animation-delay: 0.2s; }
.section:nth-child(2) { animation-delay: 0.4s; }
.section:nth-child(3) { animation-delay: 0.6s; }

.section:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.section::before {
    content: '<section>';
    position: absolute;
    top: 10px;
    left: 10px;
    color: var(--secondary-color);
    opacity: 0.5;
    font-size: 12px;
}

.section::after {
    content: '</section>';
    position: absolute;
    bottom: 10px;
    right: 10px;
    color: var(--secondary-color);
    opacity: 0.5;
    font-size: 12px;
}

h2 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--highlight-color);
}

h2::before {
    content: '# ';
    color: var(--secondary-color);
}

#skills-list, #portfolio-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

#portfolio-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    max-width: 100%;
}

@media (min-width: 769px) {
    #portfolio-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

.skill-item, .portfolio-item {
    background-color: var(--bg-color);
    padding: 20px;
    border-radius: 5px;
    transition: transform 0.3s ease, background-color 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.skill-item:hover, .portfolio-item:hover {
    transform: translateY(-5px);
    background-color: #1F2937;
    animation: pulse 0.5s ease-in-out;
}

.skill-icon, .portfolio-icon {
    font-size: 24px;
    margin-bottom: 10px;
    color: var(--highlight-color);
}

#testimonials-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.testimonial-item {
    background-color: var(--bg-color);
    padding: 20px;
    border-radius: 5px;
    position: relative;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.testimonial-item:hover {
    background-color: #1F2937;
    transform: scale(1.02);
}

.testimonial-item::before {
    content: '"';
    font-size: 48px;
    position: absolute;
    top: -10px;
    left: 10px;
    color: var(--highlight-color);
    opacity: 0.5;
}

.testimonial-author {
    font-weight: bold;
    margin-top: 10px;
    color: var(--highlight-color);
}

.portfolio-item {
    background-color: var(--bg-color);
    padding: 25px;
    border-radius: 8px;
    transition: transform 0.3s ease, background-color 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.portfolio-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 5px;
    margin-bottom: 15px;
}

.portfolio-item h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--highlight-color);
}

.portfolio-item p {
    font-size: 16px;
    color: var(--secondary-color);
}

.portfolio-item .project-category {
    font-size: 12px;
    color: var(--highlight-color);
    margin-top: 10px;
}

.portfolio-item a {
    color: var(--highlight-color);
    text-decoration: none;
    margin-top: 10px;
    transition: color 0.3s ease;
}

.portfolio-item a:hover {
    color: var(--text-color);
}

@media (max-width: 768px) {
    .container {
        grid-template-columns: 1fr;
    }
    
    .sidebar {
        position: static;
    }
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}