* {
    box-sizing: border-box;
}


body {
    margin: 0;
    padding: 0;

    font-family:
        Arial,
        "Microsoft YaHei",
        sans-serif;

    background: #f5f5f5;
    color: #222;
}


.page-container {
    width: 100%;

    min-height: 100vh;

    display: flex;
    justify-content: center;
    align-items: center;

    padding: 24px;
}


.entry-card {
    width: 100%;
    max-width: 520px;

    padding: 36px 40px;

    background: white;

    border-radius: 10px;

    box-shadow:
        0 2px 14px
        rgba(0, 0, 0, 0.08);
}


.entry-card h1 {
    margin:
        0
        0
        20px;

    text-align: center;

    font-size: 28px;
    font-weight: 600;
}


.intro-text {
    margin:
        0
        0
        30px;

    text-align: center;

    font-size: 16px;
    line-height: 1.7;

    color: #555;
}


.form-group {
    margin-bottom: 22px;
}


.form-group label {
    display: block;

    margin-bottom: 8px;

    font-size: 16px;
    font-weight: 600;
}


.form-group input,
.form-group select {
    width: 100%;

    min-height: 44px;

    padding:
        9px
        12px;

    border:
        1px solid #cccccc;

    border-radius: 6px;

    background: white;

    font-size: 16px;
}


.form-group input:focus,
.form-group select:focus {
    outline: none;

    border-color: #555;
}


.help-text {
    margin-top: 7px;

    font-size: 13px;
    line-height: 1.5;

    color: #777;
}


.start-button {
    width: 100%;

    min-height: 50px;

    margin-top: 8px;

    border: none;
    border-radius: 6px;

    background: #333333;
    color: white;

    font-size: 18px;

    cursor: pointer;
}


.start-button:disabled {
    background: #bdbdbd;
    cursor: not-allowed;
}


.error-message {
    margin:
        4px
        0
        18px;

    padding: 12px;

    border-radius: 6px;

    background: #f3f3f3;

    font-size: 15px;
    line-height: 1.6;
}


.loading-message {
    margin-top: 18px;

    text-align: center;

    font-size: 15px;

    color: #555;
}


.hidden {
    display: none !important;
}


@media (max-width: 600px) {

    .page-container {
        align-items: flex-start;

        padding:
            18px
            14px;
    }


    .entry-card {
        padding:
            28px
            20px;
    }


    .entry-card h1 {
        font-size: 24px;
    }
}