#about {
    padding-top: 80px; 
    overflow-x: hidden;
    background-color: var(--background-color);
}

#about h2 {
    text-align: center;
    font-size: 2.8rem;
    margin-bottom: 5rem;
    color: var(--primary-color);
    position: relative;
    font-weight: 600;
}

#about h2::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
    opacity: 0.8;
    border-radius: 2px;
}

.education-container {
    position: relative;
    max-width: 900px;
    margin: 40px auto;
    padding: 40px 20px;
}

.education-container::before {
    content: '';
    position: absolute;
    width: 2px;
    background-color: #333;
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1px;
}

.education-grid {
    display: block; 
    position: relative;
    margin: 50px 0;
    opacity: 0;
    transform: translateY(40px);
    animation: fadeInUp 0.8s ease-out forwards;
}

.education-grid:nth-child(2) { animation-delay: 0.1s; }
.education-grid:nth-child(3) { animation-delay: 0.2s; }
.education-grid:nth-child(4) { animation-delay: 0.3s; }
.education-grid:nth-child(5) { animation-delay: 0.4s; }

.education-item {
    padding: 25px 35px;
    position: relative;
    width: 47%;
    background: #242424;
    border-radius: 8px;
    border: 1px solid #333;
    transition: border-color 0.3s ease;
}

.education-item:hover {
    border-color: var(--primary-color);
}

.education-item::after {
    content: '';
    position: absolute;
    width: 12px;
    height: 12px;
    background-color: var(--primary-color);
    top: 35px;
    border-radius: 50%;
    z-index: 1;
}

.education-item::before {
    content: ' ';
    height: 0;
    position: absolute;
    top: 36px;
    width: 0;
    z-index: 1;
    border: solid 8px transparent;
}

.education-grid:nth-child(odd) .education-item {
    left: 0;
    text-align: right;
    flex-direction: row-reverse;
}

.education-grid:nth-child(odd) .education-item::after {
    right: -27px;
}

.education-grid:nth-child(odd) .education-item::before {
    right: -16px;
    border-left-color: #242424;
    transition: border-left-color 0.3s ease;
}
.education-grid:nth-child(odd) .education-item:hover::before {
    border-left-color: var(--primary-color);
}

.education-grid:nth-child(even) .education-item {
    left: 53%;
}

.education-grid:nth-child(even) .education-item::after {
    left: -25px;
}

.education-grid:nth-child(even) .education-item::before {
    left: -16px;
    border-right-color: #242424;
    transition: border-right-color 0.3s ease;
}
.education-grid:nth-child(even) .education-item:hover::before {
    border-right-color: var(--primary-color);
}

.edu-content h3 {
    font-weight: 600;
    color: var(--text-color);
    transition: color 0.3s ease;
}
.education-item:hover .edu-content h3 {
    color: var(--primary-color);
}
.edu-content p {
    color: var(--secondary-text);
}
.edu-content .date {
    font-size: 0.9rem;
    color: #888;
    margin-bottom: 5px;
}

.expertise-grid {
    gap: 2.5rem; 
}

.expertise-item {
    background-color: #1A1A1A;
    border: 1px solid #2A2A2A;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    will-change: transform, box-shadow;
}

.expertise-item:hover {
    transform: translateY(-10px) scale(1.03);
    box-shadow: 0 10px 25px rgba(0, 191, 143, 0.2);
}

.expertise-item h3 {
    color: var(--primary-color);
    margin-top: 0.5rem;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    #about h2 {
        font-size: 2.2rem;
    }

    .education-container::before {
        left: 30px;
    }

    .education-grid:nth-child(odd) .education-item,
    .education-grid:nth-child(even) .education-item {
        width: calc(100% - 50px);
        left: 50px;
        text-align: left;
        flex-direction: row;
    }
    
    .education-grid:nth-child(odd) .education-item::after,
    .education-grid:nth-child(even) .education-item::after {
        left: -31px;
    }

    .education-grid:nth-child(odd) .education-item::before,
    .education-grid:nth-child(even) .education-item::before {
        left: -16px;
        border-right-color: #242424;
        border-left-color: transparent;
    }
    .education-grid:nth-child(odd) .education-item:hover::before,
    .education-grid:nth-child(even) .education-item:hover::before {
        border-right-color: var(--primary-color);
        border-left-color: transparent;
    }
    
    .expertise-item:hover {
        transform: translateY(-5px); 
    }
}