:root {
    --bg-color: #f7f9fc;
    --card-bg: #ffffff;
    --accent-blue: #2c3e50;
    --text-main: #333333;
    --border-color: #e0e0e0;
}
/* AND remember to update the body style! */
body {
    background-color: var(--bg-color);
}
.main-container {
    display: flex; 
    gap: 20px; 
    margin-bottom: 20px;
    padding: 15px;
}
.editor-container{
    display: flex;
    flex: 2;
    flex-direction: column;
    gap: 10px;
}
.editors{
    display: flex;
}
.eval-corner {
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 10px;
}
.CodeMirror {
    height: 100%;
    width: 100%;
}
.run-button {
    cursor: pointer;
}

.run-button.success{
    background-color: #04AA6D;
}

.run-button.failure{
    background-color: #D92211;
}

.exercises-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.exercise-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 24px;
    position: relative;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.exercise-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0,0,0,0.1);
    border-color: var(--accent-blue);
    cursor: pointer;
}

.exercise-title {
    font-weight: bold;
    color: var(--accent-blue);
    font-size: 0.9rem;
    margin-bottom: 8px;
    display: block;
    text-transform: uppercase;
}

.tags-container {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
}

.tag {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 500;
    text-align: center;
    background-color: var(--border-color);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.tag:hover, .tag.active {
    background-color: var(--accent-blue);
    color: var(--card-bg);
    border-color: var(--accent-blue);
    cursor: pointer;
}