/**
 * Code Block Styles
 * Accessible syntax-highlighted code display with copy functionality
 * WCAG 2.1 AA compliant with proper contrast and keyboard navigation
 */

/* ==========================================
   Container Styles
   ========================================== */

.code-block-container {
    margin: 2rem 0;
    border: 1px solid var(--code-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--code-bg);
    box-shadow: var(--shadow-sm);
    /* Fix sub-pixel rendering artifacts at rounded corners */
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* Header with caption and language */
.code-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--code-header-bg);
    border-bottom: 1px solid var(--code-border);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.code-block-caption {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.code-block-language {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.25rem 0.5rem;
    background: var(--bg-elevated);
    border-radius: var(--radius-sm);
    /* Fix sub-pixel rendering artifacts at rounded corners */
    transform: translateZ(0);
    backface-visibility: hidden;
}

/* ==========================================
   Code Wrapper & Content
   ========================================== */

.code-block-wrapper {
    position: relative;
    background: var(--code-content-bg);
}

.code-block-content {
    overflow-x: auto;
    background: var(--code-content-bg);
}

/* Pygments generated code styles */
.code-block-content .code-highlight {
    margin: 0;
    padding: 0;
    background: transparent;
}

/* Line number table layout */
.code-block-content .code-highlight .linenos {
    background: var(--code-header-bg);
    color: var(--text-tertiary);
    padding: 1rem 0.75rem;
    text-align: right;
    user-select: none;
    border-right: 1px solid var(--code-border);
    vertical-align: top;
}

.code-block-content .code-highlight .code {
    padding: 1rem;
    vertical-align: top;
}

/* Pre and code elements */
.code-block-content pre {
    margin: 0;
    padding: 0;
    overflow-x: auto;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    tab-size: 4;
}

.code-block-content code {
    font-family: inherit;
    background: transparent;
    padding: 0;
}

/* ==========================================
   Copy Button
   ========================================== */

.code-copy-button {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
    z-index: 10;
    box-shadow: var(--shadow-sm);
}

.code-copy-button:hover {
    background: var(--btn-primary-hover-bg);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.code-copy-button:active {
    transform: translateY(0);
}

.code-copy-button:focus {
    outline: 3px solid var(--btn-primary-focus-ring);
    outline-offset: 2px;
}

.code-copy-button .copy-icon {
    font-size: 1rem;
}

/* Copied state */
.code-copy-button.copied {
    background: var(--color-success);
}

.code-copy-button.copied:hover {
    background: var(--color-success-dark);
}

.code-copy-button .copied-text {
    display: none;
}

.code-copy-button.copied .copy-text {
    display: none;
}

.code-copy-button.copied .copied-text {
    display: inline;
}

/* ==========================================
   Syntax Highlighting (Pygments default theme)
   ========================================== */

/* Comments */
.code-highlight .c { color: var(--syntax-comment); font-style: italic; }
.code-highlight .cm { color: var(--syntax-comment); font-style: italic; }
.code-highlight .cp { color: var(--syntax-preprocessor); }
.code-highlight .c1 { color: var(--syntax-comment); font-style: italic; }
.code-highlight .cs { color: var(--syntax-comment); }

/* Errors */
.code-highlight .err { border: 1px solid var(--syntax-error); }

/* Keywords */
.code-highlight .k { color: var(--syntax-keyword); font-weight: bold; }
.code-highlight .kc { color: var(--syntax-keyword); font-weight: bold; }
.code-highlight .kd { color: var(--syntax-keyword); font-weight: bold; }
.code-highlight .kn { color: var(--syntax-keyword); font-weight: bold; }
.code-highlight .kp { color: var(--syntax-keyword); }
.code-highlight .kr { color: var(--syntax-keyword); font-weight: bold; }
.code-highlight .kt { color: var(--syntax-type); }

/* Operators */
.code-highlight .o { color: var(--syntax-operator); }
.code-highlight .ow { color: var(--syntax-keyword); font-weight: bold; }

/* Names */
.code-highlight .na { color: var(--syntax-string); }
.code-highlight .nb { color: var(--syntax-namespace); }
.code-highlight .nc { color: var(--syntax-namespace); font-weight: bold; }
.code-highlight .no { color: var(--syntax-namespace); }
.code-highlight .nd { color: var(--syntax-function); font-weight: bold; }
.code-highlight .ni { color: var(--syntax-function); font-weight: bold; }
.code-highlight .ne { color: var(--syntax-function); }
.code-highlight .nf { color: var(--syntax-function); }
.code-highlight .nl { color: var(--syntax-function); font-weight: bold; }
.code-highlight .nn { color: var(--syntax-namespace); font-weight: bold; }
.code-highlight .nt { color: var(--syntax-tag); font-weight: bold; }
.code-highlight .nv { color: var(--syntax-variable); }

/* Literals */
.code-highlight .m { color: var(--syntax-number); }
.code-highlight .mb { color: var(--syntax-number); }
.code-highlight .mf { color: var(--syntax-number); }
.code-highlight .mh { color: var(--syntax-number); }
.code-highlight .mi { color: var(--syntax-number); }
.code-highlight .mo { color: var(--syntax-number); }
.code-highlight .s { color: var(--syntax-string); }
.code-highlight .sb { color: var(--syntax-string); }
.code-highlight .sc { color: var(--syntax-string); }
.code-highlight .sd { color: var(--syntax-string); font-style: italic; }
.code-highlight .s2 { color: var(--syntax-string); }
.code-highlight .se { color: var(--syntax-string-escape); font-weight: bold; }
.code-highlight .sh { color: var(--syntax-string); }
.code-highlight .si { color: var(--syntax-string); font-style: italic; }
.code-highlight .sx { color: var(--syntax-string); }
.code-highlight .sr { color: var(--syntax-string-regex); }
.code-highlight .s1 { color: var(--syntax-string); }
.code-highlight .ss { color: var(--syntax-string); }

/* Highlighted lines */
.code-highlight .hll { background-color: var(--syntax-highlight-bg); }

/* ==========================================
   High Contrast Mode
   ========================================== */

@media (prefers-contrast: high) {
    .code-block-container {
        border-width: 2px;
    }

    .code-copy-button:focus {
        outline-width: 4px;
    }

    .code-block-header {
        font-weight: 700;
    }
}

/* ==========================================
   Responsive Design
   ========================================== */

@media (max-width: 768px) {
    .code-block-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .code-copy-button {
        position: static;
        width: 100%;
        justify-content: center;
        margin-bottom: 0.5rem;
    }

    .code-block-content pre {
        font-size: 0.85rem;
    }
}

/* ==========================================
   Print Styles
   ========================================== */

@media print {
    .code-block-container {
        border: 2px solid #000;
        break-inside: avoid;
    }

    .code-copy-button {
        display: none;
    }

    .code-block-content pre {
        white-space: pre-wrap;
        word-wrap: break-word;
    }
}