details {
    margin: 0.5rem 0;
    border-radius: var(--pico-border-radius);
}
details > summary {
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--pico-border-radius);
    transition: background-color 0.2s;
    list-style: none;
}
details > summary:hover {
    background-color: var(--pico-muted-border-color);
}
details[open] > summary {
    background-color: var(--pico-muted-border-color);
    margin-bottom: 0.5rem;
}
/* Custom disclosure indicator */
summary::before {
    content: "▶";
    display: inline-block;
    margin-right: 0.5rem;
    font-size: 0.75rem;
    transition: transform 0.2s;
    color: var(--pico-muted-color);
}
details[open] > summary::before {
    transform: rotate(90deg);
}
/* Level-specific styling */
.month-group > summary {
    font-size: 1.1rem;
}
.week-group > summary {
    font-size: 0.95rem;
}
.month-content {
    padding-left: 1rem;
    border-left: 2px solid var(--pico-muted-border-color);
}
.week-group {
    margin-left: 0.5rem;
}
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 1rem;
}
.page-header h1 {
    margin: 0;
}
.search-button {
    font-size: 0.8rem;
    padding: 0.25rem 0.6rem;
    margin: 0;
}
/* Smooth transitions for details content */
@supports (transition-behavior: allow-discrete) {
    details::details-content {
        transition: block-size 0.3s, content-visibility 0.3s;
        transition-behavior: allow-discrete;
        overflow: hidden;
    }
}