:root {
    --color-primary:        #069fdb;
    --color-primary-border: #E0FFFF;
    --color-bg:             #ffffff;
    --color-surface:        #ffffff;
    --color-border:         #e0e0e0;
    --color-border-input:   #cccdcf;
    --color-border-focus:   #6688aa;
    --color-text:           #333333;
    --color-text-muted:     #555555;

    --font-size-base:  14px;
    --font-size-label: 14px;

    --card-width:  400px;
    --card-height: 520px;
    --card-radius: 10px;

    --auth-padding:        0 30px 30px;
    --input-padding:       10px;
    --input-margin-bottom: 20px;
    --btn-padding:         10px;
    --btn-radius:          5px;
    --logo-height:         100px;

    --transition-speed: 0.3s;
}

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

body {
    min-height: 100vh;
    display: flex;
    background: var(--color-bg);
}

.card {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--color-border);
    border-radius: var(--card-radius);
    width: var(--card-width);
    height: var(--card-height);
    margin: auto;
    background: var(--color-surface);
}

.card__logo {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    text-align: center;
}

.card__logo-img {
    width: 100%;
    max-width: 100%;
    height: var(--logo-height);
    object-fit: contain;
}

.card__auth {
    padding: var(--auth-padding);
    flex-shrink: 0;
}

.error-message {
    color: #c0392b;
    font-size: 13px;
    margin-bottom: 16px;
    background: #fff0f0;
    border: 1px solid #f5c6c6;
    border-radius: 5px;
    padding: 10px;
}

.input-group {
    margin-bottom: var(--input-margin-bottom);
}

.input-group__label {
    display: block;
    margin-bottom: 8px;
    color: var(--color-text);
    font-size: var(--font-size-label);
}

.input-group__field {
    width: 100%;
    padding: var(--input-padding);
    border: 1px solid var(--color-border-input);
    border-radius: var(--btn-radius);
    font-size: var(--font-size-base);
}

.input-group__field:focus {
    outline: none;
    border-color: var(--color-border-focus);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 4px;
}

.checkbox-group__field {
    width: 15px;
    height: 15px;
    cursor: pointer;
    accent-color: var(--color-primary);
    flex-shrink: 0;
}

.checkbox-group__label {
    color: var(--color-text-muted);
    font-size: var(--font-size-label);
    cursor: pointer;
    user-select: none;
}

.btn {
    width: 100%;
    padding: var(--btn-padding);
    border-radius: var(--btn-radius);
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: border-color var(--transition-speed) ease;
}

.btn--primary {
    background:  var(--color-primary);
    color:       #ffffff;
    border:      1px solid var(--color-primary);
    margin-top:  15px;
}

.btn--primary:hover {
    border-color: var(--color-primary-border);
}

@media (max-width: 480px) {
    body {
        align-items: center;
        padding: 20px 16px;
    }

    .card {
        width:     100%;
        height:    auto;
        max-width: 400px;
    }

    .card__logo {
        flex:    none;
        padding: 24px 30px 16px;
    }

    .card__logo-img {
        height: 80px;
    }
}

@media (max-width: 360px) {
    :root {
        --auth-padding:    0 20px 24px;
        --font-size-base:  13px;
        --font-size-label: 13px;
    }

    .card__logo-img {
        height: 70px;
    }
}