#catnav_overlay {
    visibility: hidden;
    opacity: 0;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 10000;
    pointer-events: none;
    transition: visibility 0s linear 0.35s, opacity 0.35s ease;
}

#catnav_overlay.active {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
    transition: visibility 0s linear 0s, opacity 0.35s ease;
}

#catnav_backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.45);
    opacity: 0;
    transition: opacity 0.3s ease;
}

#catnav_overlay.active #catnav_backdrop {
    opacity: 1;
}

#catnav_sheet {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80vh;
    background: #ffffff;
    border-radius: 20px 20px 0 0;
    box-shadow: 0 -8px 40px rgba(0, 0, 0, 0.18);
    transform: translateY(100%);
    transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1);
    display: flex;
    flex-direction: column;
    will-change: transform;
}

#catnav_overlay.active #catnav_sheet {
    transform: translateY(0);
}

#catnav_sheet_header {
    display: flex;
    align-items: center;
    padding: 16px 16px 12px;
    border-bottom: 1px solid #f0f0f0;
    flex-shrink: 0;
    gap: 8px;
}

#catnav_sheet_title {
    font-size: 18px;
    font-weight: 700;
    color: #1a1a1a;
    margin: 0;
    flex: 1;
}

#catnav_goto {
    font-size: 13px;
    font-weight: 600;
    color: #1a56db;
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 6px;
    background: #eef4fb;
    white-space: nowrap;
    transition: background 0.15s;
    flex-shrink: 0;
}

#catnav_goto:hover {
    background: #dde8ff;
}

#catnav_close {
    width: 36px;
    height: 36px;
    border: none;
    background: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #666;
    font-size: 28px;
    line-height: 1;
    border-radius: 50%;
    flex-shrink: 0;
    transition: background 0.2s, color 0.2s;
}

#catnav_close:hover {
    background: #f0f0f0;
    color: #333;
}

#catnav_sheet_body {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

#catnav_producers {
    list-style: none;
    margin: 0;
    padding: 0;
    opacity: 1;
}

#catnav_categories,
#catnav_subcategories {
    display: none;
}

.catnav_cat_item {
    border-bottom: 1px solid #f5f5f5;
}

.catnav_cat_item:last-child {
    border-bottom: none;
}

.catnav_cat_btn {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 14px 16px;
    border: none;
    background: none;
    cursor: pointer;
    text-align: left;
    font-size: 15px;
    color: #333;
    font-family: Arial, Verdana, sans-serif;
    transition: background 0.15s, color 0.15s;
}

.catnav_cat_btn:hover {
    background: #eef4fb;
    color: #1a56db;
}

.catnav_cat_btn .catnav_cat_name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.catnav_cat_arrow {
    margin-left: 8px;
    color: #bbb;
    font-size: 18px;
    font-weight: bold;
    line-height: 1;
    flex-shrink: 0;
}

.catnav_cat_link {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 14px 16px;
    font-size: 15px;
    color: #333;
    font-family: Arial, Verdana, sans-serif;
    text-decoration: none;
    transition: background 0.15s, color 0.15s;
}

.catnav_cat_link:hover {
    background: #eef4fb;
    color: #1a56db;
}

.catnav_back_btn {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 14px 16px;
    border: none;
    border-left: 3px solid #1a56db;
    background: #f0f5ff;
    cursor: pointer;
    text-align: left;
    font-size: 15px;
    color: #1a56db;
    font-family: Arial, Verdana, sans-serif;
}