:root {
    --primary-color: #0d1117;
    --secondary-color: #161b22;
    --accent-color: #00ffc0;
    --text-color: #ffffff;
    --secondary-text-color: #c9d1d9;
    --font-futuristic: 'Orbitron', sans-serif;
}

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

body {
    background-color: var(--primary-color);
    color: var(--text-color);
    font-family: var(--font-futuristic);
    line-height: 1.6;
    overflow-x: hidden;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 5%;
    background-color: var(--secondary-color);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

.logo {
    text-align: center;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
    text-shadow: 0 0 10px var(--accent-color);
}

.nav-menu {
    text-align: center;
    align-items: center;
    display: flex;
    gap: 2rem;
}

.nav-menu a {
    color: var(--secondary-text-color);
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.3s ease, text-shadow 0.3s ease;
    text-align: center;
    align-items: center;
    justify-content: center;

}

.nav-menu a:hover {
    color: var(--accent-color);
    text-shadow: 0 0 10px var(--accent-color);
}

.hero-section {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 5%;
    position: relative;
    overflow: hidden;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 1rem;
    text-shadow: 0 0 20px rgba(0, 255, 192, 0.5);
    animation: fadeIn 2s ease-in-out;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--secondary-text-color);
    animation: fadeIn 2.5s ease-in-out;
}

.haru-logo {
    width: 300px;
    height: 300px;
    object-fit: cover;
    object-position: center;
    margin-top: 3rem;
    border-radius: 10px 10px;
    border: 2px solid var(--accent-color);
    box-shadow: 0 0 20px rgba(0, 255, 192, 0.7);
    animation: float 4s ease-in-out infinite, fadeIn 3s ease-in-out;
}

.section {
    padding: 5rem 10%;
    text-align: center;
}

.section-title {
    font-size: 3rem;
    margin-bottom: 2rem;
    color: var(--accent-color);
    text-shadow: 0 0 10px var(--accent-color);
}

.features-container, .tech-list {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card, .tech-item {
    background-color: var(--secondary-color);
    padding: 2rem;
    border-radius: 10px;
    max-width: 300px;
    border: 1px solid var(--accent-color);
    box-shadow: 0 0 15px rgba(0, 255, 192, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover, .tech-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 255, 192, 0.4);
}

.tech-icon {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
    text-shadow: 0 0 10px var(--accent-color);
}

.my-photo-container {
    margin-top: 2rem;
}

.my-photo {
    width: 200px;
    height: 200px;
    object-fit: cover;
    object-position: center;
    border-radius: 50%;
    border: 2px solid var(--accent-color);
    box-shadow: 0 0 15px rgba(0, 255, 192, 0.7);
}

.footer {
    background-color: var(--secondary-color);
    text-align: center;
    padding: 3rem 5%;
    border-top: 1px solid var(--accent-color);
}

.social-links {
    margin: 2rem 0;
}

.social-icon {
    font-size: 2rem;
    color: var(--secondary-text-color);
    margin: 0 1.5rem;
    transition: color 0.3s ease;
}

.social-icon:hover {
    color: var(--accent-color);
    text-shadow: 0 0 10px var(--accent-color);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

.section.hidden {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s ease-out, transform 1s ease-out;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}



@media (max-width: 768px) {
    .header {
        flex-direction: column;
        padding: 1rem 5%;
    }
    .nav-menu {
        margin-top: 1rem;
        gap: 1rem;
    }
    .nav-menu a {
        margin: 0 0.5rem;
    }
    .hero-title {
        font-size: 2.5rem;
    }
    .hero-subtitle {
        font-size: 1.2rem;
    }
    .section-title {
        font-size: 2rem;
    }
    .features-container, .tech-list {
        flex-direction: column;
        align-items: center;
    }
    .footer {
        padding: 2rem 5%;
    }
    .social-icon {
        margin: 0 0.8rem;
    }
}