.masthead {
    background-color: var(--primary-color);
    min-height: 100vh;
    display: flex;
    align-items: center;
    color: white;
}

.masthead h1 {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 4rem;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.masthead .lead {
    font-size: 1.5rem;
    font-weight: 300;
}

.section-title {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

.btn-download {
    background: transparent;
    border: 2px solid white;
    color: white;
    padding: 12px 25px;
    margin: 10px;
    border-radius: 50px;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    text-transform: uppercase;
    font-weight: 600;
}

.btn-download:hover {
    background: white;
    color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

.portfolio-item {
    position: relative;
    overflow: hidden;
    border-radius: 15px;
    margin-bottom: 2rem;
    transition: all 0.3s ease;
}

.portfolio-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
}

.portfolio-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(24, 188, 156, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.3s ease;
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.footer {
    background-color: var(--dark-color);
    color: white;
    padding: 4rem 0 2rem;
}

.social-btn {
    width: 50px;
    height: 50px;
    border: 2px solid white;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin: 0 10px;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-btn:hover {
    background: white;
    color: var(--dark-color);
    transform: translateY(-3px);
}

.modal {
    background: rgba(0,0,0,0.8);
}

.modal-content {
    border: none;
    border-radius: 15px;
}

.scroll-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--primary-color);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s ease;
    z-index: 1000;
}

.scroll-to-top:hover {
    background: var(--secondary-color);
    color: white;
    transform: translateY(-3px);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .masthead h1 {
        font-size: 2.5rem;
    }
    .section-title {
        font-size: 2rem;
    }
}