Trouble styling post title differently in archive versus single view

I have a test site running here

On this archive page, I would like to make the size of the_title() smaller than on the single view page.

I tried changing the class names in the entry header portion of the content-archive file: eg. entry-title to “entry-archive”, but my style sheet doesn’t recognize the new classes. What am I doing wrong?

original code below

<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
		<?php if ( is_sticky() && is_home() && ! is_paged() ) : ?>
		<div class="featured-post">
			<?php _e( 'Featured post', 'twentytwelve' ); ?>
		</div>
		<?php endif; ?>

		<div class="entry-header">
			<!-- <?php the_post_thumbnail(); ?> -->
			<?php if ( is_single() ) : ?>

			<h1 class="entry-title">
			<a href="<?php the_permalink(); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyeleven' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark">

				<?php the_title(); ?>
			</a>
		</h1>
			<?php else : ?>
			<h1 class="entry-title">
				<a href="<?php the_permalink(); ?>" title="<?php echo esc_attr( sprintf( __( 'Permalink to %s', 'twentytwelve' ), the_title_attribute( 'echo=0' ) ) ); ?>" rel="bookmark"><?php the_title(); ?></a>

			</h1>
			<?php endif;  is_single() ?>

		</div>

		<?php if ( is_search() ) : // Only display Excerpts for Search ?>
		<div class="entry-summary">
			<?php the_excerpt(); ?>
		</div>
		<?php else : ?>

	</article>