/* HTML Structure Builder */

.builder-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.builder-panel {
    min-width: 0;
}

.builder-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

    .builder-panel-header h2 {
        margin: 0;
    }

.builder-textarea {
    display: block;
    width: 100%;
    min-height: 420px;
    padding: 0.875rem 1rem;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    background: #fff;
    color: #222;
    font-family: Consolas, "Courier New", monospace;
    font-size: 0.9rem;
    line-height: 1.55;
    resize: vertical;
    box-sizing: border-box;
}

    .builder-textarea:focus {
        outline: none;
        border-color: #4f8a5b;
        box-shadow: 0 0 0 2px rgba(79, 138, 91, 0.12);
    }

.builder-panel .btn,
.preview-actions .btn {
    border: 1px solid #4f8a5b;
    background: #4f8a5b;
    color: #fff;
}

    .builder-panel .btn:hover,
    .preview-actions .btn:hover {
        background: #42754d;
        border-color: #42754d;
    }

.builder-more {
    display: block;
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.75rem 1rem;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    background: #f7f7f7;
    color: #333;
    font-size: 0.9rem;
    cursor: pointer;
}

    .builder-more:hover {
        background: #eeeeee;
    }

.builder-more-section {
    margin-top: 1.5rem;
}

.builder-preview-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
}

.builder-editor {
    min-height: 320px;
}

.preview-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 1.25rem 0 1.5rem;
}

    .preview-actions .btn {
        min-width: 120px;
        border: 1px solid #4f8a5b;
        background: #fff;
        color: #4f8a5b;
        margin-top: 0.5rem;
    }

        .preview-actions .btn:hover {
            background: #dcefe0;
            border-color: #4f8a5b;
            color: #4f8a5b;
        }

.preview-panel {
    min-width: 0;
}

#previewFrame {
    transition: height 0.2s ease;
}

.preview-frame {
    display: block;
    width: 100%;
    min-height: 0;
    border: 1px solid #d9d9d9;
    border-radius: 4px;
    background: #fff;
    box-sizing: border-box;
}

.builder-message {
    min-height: 1.5rem;
    margin: 0.75rem 0 0;
    text-align: center;
    color: #4f8a5b;
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    .builder-grid,
    .builder-preview-grid {
        grid-template-columns: 1fr;
    }

    .builder-textarea {
        min-height: 300px;
    }

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