@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800;900&display=swap');

:root {
    --bg-color: #1f242d;
    --second-bg-color: #323946;
    --text-color: #fff;
    --main-color: #0ef;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    scroll-behavior: smooth;
}

body {
    background: var(--bg-color);
    color: var(--text-color);
}

section {
    min-height: 100vh;
    padding: 8rem 9% 2rem;
    background: var(--second-bg-color);
}

.heading {
    font-size: 4.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 4rem;
}

.heading span {
    color: var(--main-color);
}

.certificates-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2.5rem;
}

.certificate-box {
    background: var(--bg-color);
    border-radius: 2rem;
    padding: 1.5rem;
    box-shadow: 0 0 1rem var(--main-color);
    transition: 0.3s ease;
    max-width: 350px;
}

.certificate-box:hover {
    box-shadow: none;
}

.certificate-box img {
    width: 100%;
    border-radius: 1rem;
    border: 3px solid var(--main-color);
    cursor: pointer;
    transition: transform 0.3s ease;
}

.certificate-box img:hover {
    transform: scale(1.03);
}

.back-button {
    display: block;
    margin: 4rem auto 0;
    padding: 1rem 2.5rem;
    background: var(--main-color);
    color: var(--second-bg-color);
    border-radius: 4rem;
    font-size: 1.6rem;
    font-weight: 600;
    box-shadow: 0 0 1rem var(--main-color);
    transition: 0.3s ease;
    text-align: center;
    text-decoration: none;
    width: fit-content;
}

.back-button:hover {
    box-shadow: none;
}

/* Responsive */
@media (max-width: 768px) {
    .heading {
        font-size: 3.5rem;
    }

    .certificate-box {
        max-width: 90%;
    }
}