#filter-controls {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
    padding: 15px 0;
    transition: all 0.4s ease-in-out;
}

#filter-controls input,
#filter-controls select,
#ranking-options select,
#filter-controls button,
.year-btn,
.back-btn,
.custom-select-wrapper .custom-select-trigger {
    background-color: #fff;
    color: #4a4a4a;
    border: 1px solid #dbdbdb;
    border-radius: 20px;
    padding: 10px 20px;
    margin: 0;
    font-size: 1em;
    cursor: pointer;
    transition: all 0.3s ease;
    outline: none;
    box-sizing: border-box;
}

#filter-controls input, #filter-controls select {
    width: auto;
    min-width: 100px;
    max-width: 250px;
    text-overflow: ellipsis;
}

/* --- Custom Select Styles --- */
.custom-select-wrapper {
    position: relative;
    display: inline-block;
    user-select: none;
}

.custom-select-trigger {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-width: 150px;
}

.custom-select-trigger::after {
    content: '▼';
    font-size: 0.7em;
    margin-left: 10px;
    transition: transform 0.3s ease;
}

.custom-select-wrapper.open .custom-select-trigger::after {
    transform: rotate(180deg);
}

.custom-options {
    position: absolute;
    top: 110%;
    left: 0;
    right: 0;
    background-color: #fff;
    border: 1px solid #dbdbdb;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.07);
    z-index: 10;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}

.custom-select-wrapper.open .custom-options {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.custom-option {
    position: relative;
    padding: 12px 20px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.custom-option:hover {
    background-color: #f4f4f9;
}

.custom-option.selected {
    background-color: #e6f2ff;
    font-weight: bold;
}

.custom-option:first-child {
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
}

.custom-option:last-child {
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
}

.subcategory-option:first-child {
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
}

.subcategory-option:last-child {
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
}

.custom-option .subcategory-list {
    position: absolute;
    left: 100%;
    top: -1px;
    min-width: 150px;
    background-color: #fff;
    border: 1px solid #dbdbdb;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.07);
    display: block; /* Changed for animation */
    opacity: 0;
    visibility: hidden;
    transform: translateX(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}

.custom-option.has-subcategories .subcategory-arrow {
    display: inline-block;
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    padding: 5px;
    font-size: 0.8em;
}

.custom-option:hover .subcategory-list,
.custom-option.sub-open .subcategory-list {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.subcategory-list.open-left {
    left: auto;
    right: 100%;
}

.subcategory-option {
    padding: 12px 20px;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.subcategory-option:hover {
    background-color: #f4f4f9;
}

.subcategory-option.selected {
    background-color: #e6f2ff;
    font-weight: bold;
}

/* --- Interaction Styles --- */
#filter-controls input:focus,
#filter-controls select:focus,
#ranking-options select:focus {
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

#filter-controls button:hover,
.year-btn:hover,
.back-btn:hover {
    border-color: #007bff;
    color: #007bff;
    box-shadow: 0 2px 8px rgba(0, 123, 255, 0.1);
}

#filter-controls select:hover,
#ranking-options select:hover {
    border-color: #007bff;
}

#filter-controls button:active,
.year-btn:active,
.back-btn:active {
    transform: translateY(1px);
    box-shadow: none;
}

#filter-controls button.active,
.year-btn.active {
    background-color: #007bff;
    color: #fff;
    border-color: #007bff;
    font-weight: bold;
}

#ranking-options {
    display: flex;
    gap: 15px;
    align-items: center;
    overflow: hidden;
    flex-basis: 100%;
    justify-content: center;
    max-height: 0;
    padding: 0 15px;
    margin-top: 0;
    transition: max-height 0.4s ease-out, margin-top 0.4s ease-out, padding 0.4s ease-out;
    box-sizing: border-box;
}

#ranking-options.visible {
    max-height: 80px;
    margin-top: 15px;
    padding: 15px;
}

#ranking-options.overflow-visible {
    overflow: visible;
}

@media (max-width: 600px) {
    #filter-controls {
        gap: 8px;
        margin-bottom: 15px;
        padding: 10px 0;
    }

    #filter-controls input,
    #filter-controls select,
    #ranking-options select,
    #filter-controls button,
    .year-btn,
    .back-btn {
        padding: 8px 12px;
        font-size: 0.9em;
    }
}