:root {
    --page-background: #fff;
    --page-text: #000;
    --input-background: #f2f2f2;
    --input-text: var(--page-text);
    --button-background: #DF332D;
    --button-background-active: #DF332D; 
    --button-text: #fff;
    --link-text: #273778;
}

@media (prefers-color-scheme: dark) {
    :root {
	    --page-background: #fff;
	    --page-text: #000;
	    --input-background: #f2f2f2;
	    --input-text: var(--page-text);
	    --button-background: #DF332D;
	    --button-background-active: #DF332D; 
	    --button-text: #fff;
	    --link-text: #273778;
	    /*
	    --page-background: #333333;
	    --page-text: #cccccc;
	    --input-background: #444444;
	    --input-text: var(--page-text);
	    --button-background: #357f38;
	    --button-background-active: #2b6a2e;
	    --button-text: #fff;
	    --link-text: #99a1c1;
	     */
    }

    .captcha {
        filter: invert(1);
    }
}

body {
    background-color: var(--page-background);
    color: var(--page-text);
}

a, a:visited {
    color: var(--link-text);
    font-weight: bold;
}

p {
    font-family: sans-serif;
}

.page {
    /*width: 640px;*/
    margin: auto;
}

.form {
    position: relative;
    z-index: 1;
    background-color: var(--page-background);
    color: var(--page-text);
    /*max-width: 640px;*/
    margin: 0 auto;
    padding: 25px 45px 35px 45px;
    text-align: center;
}

.form input, .form textarea, .form select {
    outline: 0;
    background-color: var(--input-background);
    color: var(--input-text);
    width: 100%;
    border: 0;
    margin: 0 0 15px;
    padding: 15px;
    box-sizing: border-box;
    font-size: 14px;
    font-family: inherit;
}

.form select {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 15px center;
    background-size: 16px;
    padding-right: 40px;
}

.form select:required:invalid {
    color: #999;
}

.form option {
    background-color: var(--input-background);
    color: var(--input-text);
}

.form option[value=""][disabled] {
    display: none;
}

.form .form-group {
    margin-bottom: 15px;
    text-align: left;
}

.form .form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: var(--page-text);
    font-size: 14px;
}

.form button {
    text-transform: uppercase;
    outline: 0;
    background-color: var(--button-background);
    color: var(--button-text);
    width: 100%;
    border: 0;
    padding: 15px;
    font-size: 14px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.form button:hover, .form button:active, .form button:focus {
    background-color: var(--button-background-active);
}

.form textarea {
    resize: vertical;
    min-height: 100px;
}

/* Стили для темной темы выпадающих списков */
@media (prefers-color-scheme: dark) {
    .form select {
        background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23cccccc' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    }
    
    .form select:required:invalid {
        color: #888;
    }
}