/* --- Base, Tabs, Subheading Styles --- (Same as provided in prompt) */
body { font-family: 'Open Sans', sans-serif; line-height: 1.6; color: #333; padding-top: 20px; }
.v-datalist-container.components-list { max-width: 960px; margin: 0 auto; }
.tasks-heading { text-align: center; font-size: 1.25rem; font-weight: 600; margin-bottom: 0.5rem; color: #444; }
.v-tabs ul { display: flex; overflow-x: auto; white-space: nowrap; list-style: none; padding: 0; margin: 0 3%; border-bottom: 1px solid #ddd; }
.v-tabs li { display: inline-block; margin: 0; }
.v-tabs a { display: inline-block; padding: 0.75rem 1.25rem; text-decoration: none; color: #333; font-weight: 500; }
.v-tabs li.active > a { color: #3273dc; border-bottom: 3px solid #3273dc; }
.v-tabs a:hover { background-color: #f0f0f0; border-radius: 4px; }
.subheading-box { background-color: #f7fdf7; border-left: 4px solid #3c763d; padding: 0.75rem 1rem; margin: 1rem 3% 1.5rem 3%; border-radius: 4px; }
.subheading-box .title { color: #3c763d; font-size: 1.25rem; margin: 0; font-weight: 600; }
.v-datalist-container.components-list { border: 2px solid #8dc63f; border-radius: 8px; padding: 1rem 1rem 10px 1rem; background-color: #fafafa; }
.v-datalist-title, .v-datalist-subtitle { margin-bottom: 0.75rem; padding-bottom: 0.75rem; border-bottom: 1px solid #eee; }
.white-boxed-panel { background-color: #fff; border: 1px solid #dbdbdb; border-radius: 6px; padding: 1.25rem; margin-bottom: 1.5rem; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.07); }
.controls-container { display: flex; justify-content: center; }

/* ----------------------------------------
   STYLES FOR ACF IMAGE CHALLENGE
   ---------------------------------------- */

.graph-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    padding: 1rem 0;
}

.graph-card {
    border: 3px solid transparent;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    background-color: #fdfdfd;
}

.graph-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
    border-color: #a0a0a0;
}

.graph-card img {
    display: block;
    width: 100%;
    height: auto;
}

.graph-card.selected.incorrect-choice {
    border-color: #ff3860; /* Red for incorrect */
    box-shadow: 0 8px 20px rgba(255, 56, 96, 0.3);
}

.graph-card.correct-choice {
    border-color: #23d160; /* Green for correct */
    box-shadow: 0 8px 20px rgba(35, 209, 96, 0.3);
}

.graph-grid.disabled .graph-card:not(.selected):not(.correct-choice) {
    opacity: 0.5;
    cursor: not-allowed;
    background-color: #f5f5f5;
}

.graph-grid.disabled .graph-card:hover {
    transform: none;
    box-shadow: none;
}

#observations .initial-text { color: #777; font-style: italic; text-align: center; }
#observations h5 { font-size: 1.2rem; font-weight: 600; margin-bottom: 1rem; text-align: center; }
#observations .feedback-correct { color: #23d160; }
#observations .feedback-incorrect { color: #ff3860; }
#observations .analysis-item { padding: 0.75rem; margin-top: 1rem; border-left: 4px solid; }
#observations .analysis-item.correct { border-left-color: #23d160; background-color: #f6fff9; }
#observations .analysis-item.incorrect { border-left-color: #ff3860; background-color: #fff5f7; }
#observations .analysis-item p { margin: 0; }
#observations .analysis-item strong { color: #333; }