Code Copy Block

<?php
if ( ! function_exists( 'scseed_code_copy_shortcode' ) ) {
    function scseed_code_copy_shortcode( $atts, $content = '' ) {
        $atts = shortcode_atts( [ 'lang' => '' ], $atts, 'sc_code' );
        $lang = esc_html( strtolower( sanitize_key( $atts['lang'] ) ) );
        $code = htmlspecialchars( trim( $content ), ENT_QUOTES, 'UTF-8' );
        $id   = 'scseed-code-' . wp_unique_id();
        $out  = '<div class="scseed-code-block">';
        if ( $lang ) {
            $out .= '<span class="scseed-code-lang">' . $lang . '</span>';
        }
        $out .= '<button class="scseed-code-copy" type="button" data-target="' . esc_attr( $id ) . '" aria-label="' . esc_attr__( 'Copy code', 'default' ) . '">';
        $out .= '<span class="scseed-code-copy-label">Copy</span>';
        $out .= '</button>';
        $out .= '<pre class="scseed-code-pre"><code id="' . esc_attr( $id ) . '">' . $code . '</code></pre>';
        $out .= '</div>';
        return $out;
    }
}
add_shortcode( 'sc_code', 'scseed_code_copy_shortcode' );

.scseed-code-block {
    position: relative;
    margin: 20px 0;
    border-radius: 8px;
    background: #1e1e2e;
    overflow: hidden;
}
.scseed-code-lang {
    position: absolute;
    top: 10px;
    left: 14px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #6272a4;
}
.scseed-code-copy {
    position: absolute;
    top: 8px;
    right: 10px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    color: #ccc;
    border-radius: 4px;
    padding: 4px 10px;
    font-size: 12px;
    cursor: pointer;
    transition: background 0.2s;
    z-index: 1;
}
.scseed-code-copy:hover  { background: rgba(255,255,255,0.16); color: #fff; }
.scseed-code-pre {
    margin: 0;
    padding: 40px 18px 18px;
    overflow-x: auto;
    font-size: 14px;
    line-height: 1.65;
}
.scseed-code-pre code {
    display: block;
    color: #cdd6f4;
    background: none;
    font-family: 'Fira Code', 'Cascadia Code', Consolas, monospace;
    white-space: pre;
}

(function () {
    function initCodeCopy() {
        document.querySelectorAll('.scseed-code-copy').forEach(function (btn) {
            if (btn.dataset.scCopyInit) return;
            btn.dataset.scCopyInit = '1';
            btn.addEventListener('click', function () {
                var targetId = btn.getAttribute('data-target');
                var el = targetId ? document.getElementById(targetId) : null;
                if (!el) return;
                var text = el.textContent || '';
                if (!navigator.clipboard || !navigator.clipboard.writeText) return;
                navigator.clipboard.writeText(text).then(function () {
                    var label = btn.querySelector('.scseed-code-copy-label');
                    if (!label) return;
                    label.textContent = 'Copied!';
                    setTimeout(function () { label.textContent = 'Copy'; }, 2000);
                });
            });
        });
    }
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', initCodeCopy);
    } else {
        initCodeCopy();
    }
})();