* {
    box-sizing: border-box;
}

body {
    margin: 0;

    min-height: 100vh;

    font-family:
        Arial,
        Helvetica,
        sans-serif;

    background:
        linear-gradient(
            135deg,
            #111827,
            #1f2937
        );

    color: #ffffff;
}


.page {

    min-height: 100vh;

    display: flex;

    align-items: center;

    justify-content: center;

    padding: 20px;
}


.card {

    width: 100%;

    max-width: 460px;

    background: #ffffff;

    color: #111827;

    border-radius: 12px;

    padding: 40px;

    box-shadow:
        0 20px 60px
        rgba(0, 0, 0, 0.35);
}


.logo {

    text-align: center;

    font-size: 32px;

    font-weight: 800;

    margin-bottom: 10px;

    color: #2563eb;
}


h1 {

    text-align: center;

    margin: 0 0 8px;

}


.subtitle {

    text-align: center;

    color: #6b7280;

    margin-bottom: 30px;
}


label {

    display: block;

    font-weight: 600;

    margin-top: 18px;

    margin-bottom: 7px;
}


input {

    width: 100%;

    padding: 13px 14px;

    border: 1px solid #d1d5db;

    border-radius: 7px;

    font-size: 15px;

    outline: none;
}


input:focus {

    border-color: #2563eb;

    box-shadow:
        0 0 0 3px
        rgba(37, 99, 235, 0.12);
}


.rules {

    margin-top: 20px;

    padding: 15px;

    background: #f3f4f6;

    border-radius: 7px;

    color: #4b5563;

    font-size: 13px;

    line-height: 1.8;
}


button {

    width: 100%;

    margin-top: 25px;

    padding: 14px;

    border: 0;

    border-radius: 7px;

    background: #2563eb;

    color: white;

    font-size: 16px;

    font-weight: 700;

    cursor: pointer;
}


button:hover {

    background: #1d4ed8;
}


.message {

    margin-top: 18px;

    text-align: center;

    font-size: 14px;
}