/* Контейнер для кнопки, чтобы не прыгал контент, когда она сменит позиционирование */
.css-modal-details {
    height: 60px;
    display:flex;
    align-items:center;
    justify-content:center;
}
 
/* Кнопка для открытия */
.css-modal-details summary {
    display: inline-flex;
    margin: 10px;
    text-decoration: none;
    position: relative;
    font-size: 20px;
    line-height: 20px;
    padding: 12px 30px;
    color: #FFF;
    font-weight: bold;
    text-transform: uppercase;
    font-family: 'Roboto', Тahoma, sans-serif;
    background: #ff3131;
    cursor: pointer;
    border: 2px solid #fff;
    overflow: hidden;
    z-index: 1;    
}
.css-modal-details summary:hover,
.css-modal-details summary:active,
.css-modal-details summary:focus {
    color: #FFF;
}
.css-modal-details summary:before {
    content: '';
    position: absolute;
    top: 0;
    right: -50px;
    bottom: 0;
    left: 0;
    border-right: 50px solid transparent;
    border-top: 50px solid #f38080;
    transition: transform 0.5s;
    transform: translateX(-100%);
    z-index: -1;
}
.css-modal-details summary:hover:before,
.css-modal-details summary:active:before,
.css-modal-details summary:focus:before {
    transform: translateX(0);
}
 
/* Кнопка при открытом окне переходит на весь экран */
.css-modal-details details[open] summary {
    cursor: default;
    opacity: 0;
    position: fixed;
    left: 0;
    top: 0;
    z-index: 3;
    width: 100%;
    height: 100%;
}
 
/* Контейнер, который затемняет страницу */
.css-modal-details details .cmc {
    display:flex;
    align-items:center;
    justify-content:center;    
}
.css-modal-details details[open] .cmc {
    pointer-events: none;
    z-index: 4;
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    animation: bg 0.5s ease;
    background: rgba(51, 122, 183, 0.7);
}
 
/* Модальное окно */
.css-modal-details details .cmt {
    font-family: Verdana, sans-serif;  
    font-size: 16px;
    padding: 20px;
    width:80%;
    max-width: 600px;
    max-height: 70%;
    transition: 0.5s;
    border: 6px solid #c0f0ab;
    border-radius: 12px;
    background: #FFF;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2), 0 16px 20px rgba(0,0,0,0.2);
    text-align: center;
    overflow: auto;
}
.css-modal-details details[open] .cmt {
    animation: scale 0.5s ease;
    z-index: 4;
    pointer-events: auto;
}
 
/* Декоративная кнопка с крестиком */
.css-modal-details details[open] .cmc:after {
    content: "";
    width: 0px;
    height: 0px;
    border: 6px solid #c0f0ab;
    border-radius: 12px;
    position: absolute;
    z-index: 10;
    top: 20px;
    right: 20px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2), 0 16px 20px rgba(0,0,0,0.2);
    background-image: ur("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23337AB7' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3e%3cline x1='18' y1='6' x2='6' y2='18'%3e%3c/line%3e%3cline x1='6' y1='6' x2='18' y2='18'%3e%3c/line%3e%3c/svg%3e");
    background-color: #FFF;
    background-size: cover;
    animation: move 0.5s ease;
}
 
/* Анимации */
@keyframes scale {
    0% {
        transform: scale(0);
    }
    100% {
        transform: scale(1);
    }
}
@keyframes move {
    0% {
        right: -80px;
    }
    100% {
        right: 20px;
    }
}
@keyframes bg {
    0% {
        background: rgba(51, 122, 183, 0);
    }
    100% {
        background: rgba(51, 122, 183, 0.7);
    }
}