/* ===== Playground Module ===== */

/* Container — fills available viewport below header */
.playground-container {
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - var(--header-height) - var(--spacing-xl) * 2);
}

/* Header toolbar */
.playground-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.playground-header h1 {
    font-family: var(--font-display);
    font-size: var(--font-size-h2);
    margin: 0;
    margin-right: auto;
}

/* Template selector */
.template-select {
    font-family: var(--font-mono);
    font-size: var(--font-size-small);
    padding: 0.45rem 0.75rem;
    background: var(--code-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    min-width: 180px;
    transition: border-color var(--transition-base) ease;
}

.template-select:hover,
.template-select:focus {
    border-color: rgba(var(--accent-primary-rgb), 0.5);
    outline: none;
}

.template-select option {
    background: var(--code-bg);
    color: var(--text-primary);
}

/* Run button */
.run-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.45rem 1.25rem;
    background: var(--accent-primary);
    color: var(--text-bright);
    border: none;
    border-radius: 4px;
    font-family: var(--font-ui);
    font-size: var(--font-size-small);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition-base) ease, transform var(--transition-fast) ease;
}

.run-btn:hover {
    background: rgba(var(--accent-primary-rgb), 0.85);
}

.run-btn:active {
    transform: scale(0.97);
}

.run-btn .material-symbols-outlined {
    font-size: 18px;
}

/* Split pane layout */
.playground-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    flex: 1;
    min-height: 500px;
}

/* Editor pane */
.editor-pane {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    border-radius: 2px 6px 6px 2px;
    overflow: hidden;
    background: var(--code-bg);
}

.pane-label {
    font-family: var(--font-mono);
    font-size: var(--font-size-ui);
    color: var(--text-dimmed);
    padding: 0.4rem 0.75rem;
    background: rgba(var(--surface-bg-rgb), 0.5);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    letter-spacing: 0.03em;
}

.pane-label .material-symbols-outlined {
    font-size: 16px;
    opacity: 0.6;
}

.editor-textarea {
    flex: 1;
    width: 100%;
    background: var(--code-bg);
    color: var(--code-variable);
    font-family: var(--font-mono);
    font-size: var(--font-size-code);
    line-height: 1.6;
    border: none;
    padding: var(--spacing-md);
    resize: none;
    outline: none;
    tab-size: 2;
    -moz-tab-size: 2;
}

.editor-textarea::placeholder {
    color: var(--text-dimmed);
}

/* Preview pane */
.preview-pane {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    border-radius: 2px 6px 6px 2px;
    overflow: hidden;
    background: rgba(var(--surface-bg-rgb), 0.2);
}

.preview-iframe {
    flex: 1;
    width: 100%;
    border: none;
    background: var(--bg-dark);
}

/* Info bar */
.playground-info {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    font-size: var(--font-size-small);
    color: var(--text-dimmed);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.playground-info .material-symbols-outlined {
    font-size: 16px;
    opacity: 0.6;
}

.playground-info kbd {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: rgba(var(--surface-bg-rgb), 0.5);
    border: 1px solid var(--border-color);
    border-radius: 3px;
    padding: 0.1em 0.4em;
    color: var(--text-secondary);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .playground-split {
        grid-template-columns: 1fr;
        min-height: auto;
    }

    .editor-pane {
        min-height: 300px;
    }

    .preview-pane {
        min-height: 300px;
    }

    .playground-header {
        gap: var(--spacing-sm);
    }

    .playground-header h1 {
        width: 100%;
    }

    .template-select {
        flex: 1;
        min-width: 0;
    }
}