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

html, body {
    min-height: 100vh;
    font-family: Inter,ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial;
}

h1 {
    font-size: 28px;
}
h2 {
    font-size: 24px;
    margin-bottom: 10px;
}
h3 {
    font-size: 21px;
    margin-bottom: 10px;
}

a {
    text-decoration: none;
    color: white;
    transition: .3s;
}
    a:hover {
        color: #a7b5c5;
    }
.active {
    color: #a7b5c5;
}
ul li,
ol li {
    list-style-position: inside;
    padding-left: 20px;
}
input,
select,
textarea {
    font-family: Inter,ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial;
    padding: 3px;
}
.page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
nav {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    width: 100%;
    background: #0f172a;
    color: white;
}
main {
    flex-grow: 1;
    padding: 20px;
    display: flex;
    justify-content: center;
    width: 100%;
}
main section {
    width: 980px;
    display: flex;
    flex-direction: column;
}
footer {
    flex-shrink: 0;
    display: flex;
    background: #0f172a;
    color: white;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.text-btn {
    width: max-content;
    color: white;
    background: #2563eb;
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: .3s;
}
    .text-btn:hover {
        background-color: rgba(37, 99, 235, 0.9);
    }
    .text-btn:active {
        background-color: #1e40af;
    }