* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: #f6f8fa;
    color: #24292f;
    font-family: -apple-system, BlinkMacSystemFont,
        "Segoe UI", sans-serif;
}

header {
    height: 64px;
    background: #fff;
    border-bottom: 1px solid #d8dee4;
}

nav {
    max-width: 1040px;
    height: 100%;
    margin: auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    font-size: 20px;
    font-weight: 700;
    color: #24292f;
    text-decoration: none;
}

nav .links {
    display: flex;
    gap: 24px;
}

nav a:not(.brand) {
    color: #57606a;
    font-size: 14px;
    text-decoration: none;
}

nav a:hover {
    color: #0969da;
}

main {
    max-width: 960px;
    margin: 100px auto;
    padding: 0 24px;
}

.hero {
    max-width: 650px;
}

.hero h1 {
    font-size: 42px;
    margin-bottom: 18px;
    letter-spacing: -1.5px;
}

.hero p {
    color: #57606a;
    font-size: 17px;
    line-height: 1.7;
}

.actions {
    display: flex;
    gap: 12px;
    margin-top: 30px;
}

.btn {
    display: inline-block;
    padding: 11px 18px;
    border-radius: 6px;
    background: #1f883d;
    color: #fff;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
}

.btn.secondary {
    background: #fff;
    color: #24292f;
    border: 1px solid #d0d7de;
}

.card {
    max-width: 420px;
    margin: 0 auto;
    padding: 30px;
    background: #fff;
    border: 1px solid #d0d7de;
    border-radius: 9px;
}

.card h1 {
    text-align: center;
    font-size: 25px;
}

.card p {
    color: #57606a;
    text-align: center;
    font-size: 14px;
}

label {
    display: block;
    margin: 20px 0 7px;
    font-size: 14px;
    font-weight: 600;
}

input {
    width: 100%;
    padding: 11px;
    border: 1px solid #d0d7de;
    border-radius: 6px;
    font-size: 14px;
}

button {
    width: 100%;
    margin-top: 22px;
    padding: 11px;
    border: none;
    border-radius: 6px;
    background: #1f883d;
    color: white;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}

.error {
    color: #cf222e !important;
    margin-top: 16px;
}

footer {
    max-width: 960px;
    margin: 100px auto 30px;
    padding: 20px 24px;
    border-top: 1px solid #d8dee4;
    color: #6e7781;
    font-size: 13px;
}

@media (max-width: 600px) {
    main {
        margin: 60px auto;
    }

    .hero h1 {
        font-size: 32px;
    }

    nav {
        padding: 0 16px;
    }

    nav .links {
        gap: 12px;
    }
}