:root {
    --card-back-color: #991b1b;
    --card-back-image: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 8px,
        rgba(255, 255, 255, 0.25) 8px,
        rgba(255, 255, 255, 0.25) 12px
    );
}

.card-back {
    background-color: var(--card-back-color);
    background-image: var(--card-back-image);
    background-position: center;
    background-repeat: no-repeat;
    background-size: 100% 100%;
}

.card-back-picker {
    position: relative;
    width: 205px;
    margin-top: 6px;
    color: #111827;
    text-align: left;
    text-shadow: none;
}

.card-back-button {
    position: relative;
    width: 205px;
    margin: 0;
    padding: 8px 28px 8px 9px;
    overflow: hidden;
    border: 1px solid #767676;
    border-radius: 2px;
    color: #111827;
    background: white;
    font-size: 16px;
    text-align: left;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.card-back-button::after {
    content: "\25BE";
    position: absolute;
    top: 50%;
    right: 9px;
    transform: translateY(-50%);
}

.card-back-menu {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    left: 0;
    z-index: 100;
    width: 330px;
    padding: 8px;
    grid-template-columns: 200px 110px;
    gap: 10px;
    border: 2px solid #d4af37;
    border-radius: 9px;
    background: rgba(8, 12, 20, 0.97);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.65);
    box-sizing: border-box;
}

.card-back-menu.open {
    display: grid;
}

.card-back-options {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.card-back-option {
    width: 100%;
    margin: 0;
    padding: 6px 8px;
    border: 1px solid transparent;
    border-radius: 4px;
    color: white;
    background: transparent;
    font-size: 14px;
    line-height: 1.15;
    text-align: left;
}

.card-back-option:hover,
.card-back-option:focus {
    border-color: #d4af37;
    outline: none;
    color: #111827;
    background: #facc15;
}

.card-back-option.selected::after {
    content: " \2713";
    color: #facc15;
    font-weight: bold;
}

.card-back-option.selected:hover::after,
.card-back-option.selected:focus::after {
    color: #166534;
}

.card-back-preview-wrap {
    align-self: start;
    color: white;
    font-size: 12px;
    text-align: center;
}

.card-back.card-back-preview {
    width: 100px;
    height: 145px;
    margin: 0 auto 7px auto;
    border: 4px solid white;
    border-radius: 6px;
    box-sizing: border-box;
    box-shadow: 2px 3px 7px rgba(0, 0, 0, 0.65);
}

.card-back-preview-name {
    line-height: 1.2;
}

.use-card-back-button,
.settings-button {
    display: none;
}

@media (max-width: 700px) {
    .settings-button {
        display: block;
        position: fixed;
        top: 8px;
        left: 8px;
        z-index: 45;
        min-height: 40px;
        margin: 0;
        padding: 7px 11px;
        border: 2px solid #d4af37;
        border-radius: 8px;
        color: white;
        background: rgba(0, 0, 0, 0.88);
        font-size: 14px;
        text-shadow: 1px 1px 2px black;
    }

    .theme-picker {
        display: none;
    }

    .theme-picker.mobile-open {
        display: block;
        position: fixed;
        top: 55px;
        left: 8px;
        z-index: 44;
        width: 220px;
        padding: 8px;
        box-sizing: border-box;
    }

    .theme-picker #themeSelect,
    .card-back-picker,
    .card-back-button {
        width: 200px;
    }

    .card-back-button {
        padding: 5px 24px 5px 7px;
        font-size: 14px;
    }

    .card-back-menu {
        position: fixed;
        top: 102px;
        left: 8px;
        width: calc(100vw - 16px);
        max-height: calc(100vh - 112px);
        overflow-y: auto;
        grid-template-columns: minmax(0, 1fr) 100px;
    }

    .card-back.card-back-preview {
        width: 90px;
        height: 131px;
    }

    .use-card-back-button {
        display: block;
        width: 100%;
        min-height: 42px;
        margin: 9px 0 0 0;
        padding: 7px 4px;
        color: #111827;
        background: #facc15;
        font-size: 13px;
        font-weight: bold;
    }
}