:root {
    --color-primary: #4f46e5;
    --color-secondary: #22c55e;
    --color-danger: #ef4444;
    --color-text: #1f2937;
    --color-bg: #ffffff;
}


.text-color-primary {
    color: var(--color-secondary);
    font-weight: 700;
}

nav a {
    position: relative;
}

nav a:hover {
    color: var(--color-secondary)
}

nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 2px;
    background-color: var(--color-secondary);
    transition: width 0.3s ease;
}

nav a:hover::after,
nav a:focus::after {
    width: 100%;
}



.header-hero {
    background: linear-gradient(rgba(2, 133, 199, 0.288), rgba(6, 181, 212, 0.171)),
        url('../img/hero.jpg') center/cover;
    background-size: cover;
    background-position: center 70%;
    background-repeat: no-repeat;
    min-height: 85vh;
    ;
}

@media screen and (max-width: 640px) {
    .header-hero {
        height: 320px;
        background-position: top;
    }
}


@media (min-width: 640px) {
    .header-hero {
        min-height: 70vh;
    }
}

@media (min-width: 1024px) {
    .header-hero {
        min-height: 80vh;
    }
}


@media screen and (max-width: 640px) {
    #about img {
        width: 100%;
    }

}


.card-hover {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-hover:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(37, 150, 190, 0.15);
}

.water-wave {
    position: relative;
    overflow: hidden;
}

.water-wave::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #2596be, #22d3ee, #2596be);
    background-size: 200% 100%;
    animation: wave 3s linear infinite;
}

@keyframes wave {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}