/* Course cover presentation: image, solid, gradient, geometric. */
body.mathcourse-site .mathcourse-center__cover-placeholder {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100%;
    overflow: hidden;
    padding: 24px 28px;
    box-sizing: border-box;
    color: #fff;
    background: var(--mc-cover-color, #1769e0);
    isolation: isolate;
}

body.mathcourse-site .mathcourse-center__cover-placeholder > span {
    position: relative;
    z-index: 2;
    max-width: 82%;
    color: inherit;
    font-size: clamp(18px, 2.2vw, 28px);
    line-height: 1.25;
    font-weight: 850;
    letter-spacing: -.035em;
    text-align: center;
    text-wrap: balance;
}

body.mathcourse-site .mathcourse-center__cover-placeholder > b {
    position: absolute;
    right: 20px;
    bottom: -18px;
    z-index: 1;
    color: rgba(255,255,255,.13);
    font-family: Georgia, serif;
    font-size: 120px;
    line-height: 1;
    font-weight: 400;
}

body.mathcourse-site .mathcourse-center__cover-placeholder::before,
body.mathcourse-site .mathcourse-center__cover-placeholder::after {
    content: "";
    position: absolute;
    z-index: 0;
    border-radius: 50%;
    pointer-events: none;
}

body.mathcourse-site .mathcourse-center__cover-placeholder::before {
    width: 180px;
    height: 180px;
    top: -92px;
    left: -48px;
    background: rgba(255,255,255,.12);
}

body.mathcourse-site .mathcourse-center__cover-placeholder::after {
    width: 120px;
    height: 120px;
    right: 14%;
    top: -58px;
    border: 1px solid rgba(255,255,255,.18);
}

body.mathcourse-site .mathcourse-center__cover-placeholder--gradient {
    background: linear-gradient(135deg, var(--mc-cover-color, #1769e0), rgba(13,41,66,.96));
}

body.mathcourse-site .mathcourse-center__cover-placeholder--geometric {
    background: var(--mc-cover-color, #1769e0);
}

body.mathcourse-site .mathcourse-center__cover-placeholder--geometric::before {
    width: 210px;
    height: 210px;
    top: -108px;
    left: auto;
    right: -72px;
    border-radius: 32px;
    transform: rotate(22deg);
    background: rgba(255,255,255,.1);
}

body.mathcourse-site .mathcourse-center__cover-placeholder--geometric::after {
    width: 150px;
    height: 150px;
    right: auto;
    top: auto;
    left: -75px;
    bottom: -88px;
    border: 0;
    border-radius: 28px;
    transform: rotate(18deg);
    background: rgba(13,41,66,.14);
}

body.mathcourse-site .mathcourse-center__cover-placeholder--solid {
    background: var(--mc-cover-color, #1769e0);
}

body.mathcourse-site .mathcourse-center__card:hover .mathcourse-center__cover-placeholder > b {
    transform: scale(1.04) rotate(-3deg);
}

body.mathcourse-site .mathcourse-center__cover-placeholder > b {
    transition: transform .25s ease;
}

@media (max-width: 760px) {
    body.mathcourse-site .mathcourse-center__cover-placeholder { padding: 20px; }
    body.mathcourse-site .mathcourse-center__cover-placeholder > span { font-size: 20px; }
    body.mathcourse-site .mathcourse-center__cover-placeholder > b { right: 12px; bottom: -14px; font-size: 88px; }
}

@media (max-width: 390px) {
    body.mathcourse-site .mathcourse-center__cover-placeholder > span { font-size: 18px; }
}